Eric Lee / smarc-fsl-linux-kernel

translation-table.c 128 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 
/* Copyright (C) 2007-2016  B.A.T.M.A.N. contributors:
 *
 * Marek Lindner, Simon Wunderlich, Antonio Quartulli
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "translation-table.h"
#include "main.h"

#include <linux/atomic.h>
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/byteorder/generic.h>
#include <linux/cache.h>
#include <linux/compiler.h>
#include <linux/crc32c.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/fs.h>
#include <linux/if_ether.h>
#include <linux/init.h>
#include <linux/jhash.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/seq_file.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/workqueue.h>
#include <net/genetlink.h>
#include <net/netlink.h>
#include <net/sock.h>
#include <uapi/linux/batman_adv.h>

#include "bridge_loop_avoidance.h"
#include "hard-interface.h"
#include "hash.h"
#include "log.h"
#include "multicast.h"
#include "netlink.h"
#include "originator.h"
#include "packet.h"
#include "soft-interface.h"
#include "tvlv.h"

static struct kmem_cache *batadv_tl_cache __read_mostly;
static struct kmem_cache *batadv_tg_cache __read_mostly;
static struct kmem_cache *batadv_tt_orig_cache __read_mostly;
static struct kmem_cache *batadv_tt_change_cache __read_mostly;
static struct kmem_cache *batadv_tt_req_cache __read_mostly;
static struct kmem_cache *batadv_tt_roam_cache __read_mostly;

/* hash class keys */
static struct lock_class_key batadv_tt_local_hash_lock_class_key;
static struct lock_class_key batadv_tt_global_hash_lock_class_key;

static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
				 unsigned short vid,
				 struct batadv_orig_node *orig_node);
static void batadv_tt_purge(struct work_struct *work);
static void
batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
static void batadv_tt_global_del(struct batadv_priv *bat_priv,
				 struct batadv_orig_node *orig_node,
				 const unsigned char *addr,
				 unsigned short vid, const char *message,
				 bool roaming);

/**
 * batadv_compare_tt - check if two TT entries are the same
 * @node: the list element pointer of the first TT entry
 * @data2: pointer to the tt_common_entry of the second TT entry
 *
 * Compare the MAC address and the VLAN ID of the two TT entries and check if
 * they are the same TT client.
 * Return: true if the two TT clients are the same, false otherwise
 */
static bool batadv_compare_tt(const struct hlist_node *node, const void *data2)
{
	const void *data1 = container_of(node, struct batadv_tt_common_entry,
					 hash_entry);
	const struct batadv_tt_common_entry *tt1 = data1;
	const struct batadv_tt_common_entry *tt2 = data2;

	return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
}

/**
 * batadv_choose_tt - return the index of the tt entry in the hash table
 * @data: pointer to the tt_common_entry object to map
 * @size: the size of the hash table
 *
 * Return: the hash index where the object represented by 'data' should be
 * stored at.
 */
static inline u32 batadv_choose_tt(const void *data, u32 size)
{
	struct batadv_tt_common_entry *tt;
	u32 hash = 0;

	tt = (struct batadv_tt_common_entry *)data;
	hash = jhash(&tt->addr, ETH_ALEN, hash);
	hash = jhash(&tt->vid, sizeof(tt->vid), hash);

	return hash % size;
}

/**
 * batadv_tt_hash_find - look for a client in the given hash table
 * @hash: the hash table to search
 * @addr: the mac address of the client to look for
 * @vid: VLAN identifier
 *
 * Return: a pointer to the tt_common struct belonging to the searched client if
 * found, NULL otherwise.
 */
static struct batadv_tt_common_entry *
batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
		    unsigned short vid)
{
	struct hlist_head *head;
	struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
	u32 index;

	if (!hash)
		return NULL;

	ether_addr_copy(to_search.addr, addr);
	to_search.vid = vid;

	index = batadv_choose_tt(&to_search, hash->size);
	head = &hash->table[index];

	rcu_read_lock();
	hlist_for_each_entry_rcu(tt, head, hash_entry) {
		if (!batadv_compare_eth(tt, addr))
			continue;

		if (tt->vid != vid)
			continue;

		if (!kref_get_unless_zero(&tt->refcount))
			continue;

		tt_tmp = tt;
		break;
	}
	rcu_read_unlock();

	return tt_tmp;
}

/**
 * batadv_tt_local_hash_find - search the local table for a given client
 * @bat_priv: the bat priv with all the soft interface information
 * @addr: the mac address of the client to look for
 * @vid: VLAN identifier
 *
 * Return: a pointer to the corresponding tt_local_entry struct if the client is
 * found, NULL otherwise.
 */
static struct batadv_tt_local_entry *
batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
			  unsigned short vid)
{
	struct batadv_tt_common_entry *tt_common_entry;
	struct batadv_tt_local_entry *tt_local_entry = NULL;

	tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
					      vid);
	if (tt_common_entry)
		tt_local_entry = container_of(tt_common_entry,
					      struct batadv_tt_local_entry,
					      common);
	return tt_local_entry;
}

/**
 * batadv_tt_global_hash_find - search the global table for a given client
 * @bat_priv: the bat priv with all the soft interface information
 * @addr: the mac address of the client to look for
 * @vid: VLAN identifier
 *
 * Return: a pointer to the corresponding tt_global_entry struct if the client
 * is found, NULL otherwise.
 */
static struct batadv_tt_global_entry *
batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
			   unsigned short vid)
{
	struct batadv_tt_common_entry *tt_common_entry;
	struct batadv_tt_global_entry *tt_global_entry = NULL;

	tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
					      vid);
	if (tt_common_entry)
		tt_global_entry = container_of(tt_common_entry,
					       struct batadv_tt_global_entry,
					       common);
	return tt_global_entry;
}

/**
 * batadv_tt_local_entry_free_rcu - free the tt_local_entry
 * @rcu: rcu pointer of the tt_local_entry
 */
static void batadv_tt_local_entry_free_rcu(struct rcu_head *rcu)
{
	struct batadv_tt_local_entry *tt_local_entry;

	tt_local_entry = container_of(rcu, struct batadv_tt_local_entry,
				      common.rcu);

	kmem_cache_free(batadv_tl_cache, tt_local_entry);
}

/**
 * batadv_tt_local_entry_release - release tt_local_entry from lists and queue
 *  for free after rcu grace period
 * @ref: kref pointer of the nc_node
 */
static void batadv_tt_local_entry_release(struct kref *ref)
{
	struct batadv_tt_local_entry *tt_local_entry;

	tt_local_entry = container_of(ref, struct batadv_tt_local_entry,
				      common.refcount);

	batadv_softif_vlan_put(tt_local_entry->vlan);

	call_rcu(&tt_local_entry->common.rcu, batadv_tt_local_entry_free_rcu);
}

/**
 * batadv_tt_local_entry_put - decrement the tt_local_entry refcounter and
 *  possibly release it
 * @tt_local_entry: tt_local_entry to be free'd
 */
static void
batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry)
{
	kref_put(&tt_local_entry->common.refcount,
		 batadv_tt_local_entry_release);
}

/**
 * batadv_tt_global_entry_free_rcu - free the tt_global_entry
 * @rcu: rcu pointer of the tt_global_entry
 */
static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
{
	struct batadv_tt_global_entry *tt_global_entry;

	tt_global_entry = container_of(rcu, struct batadv_tt_global_entry,
				       common.rcu);

	kmem_cache_free(batadv_tg_cache, tt_global_entry);
}

/**
 * batadv_tt_global_entry_release - release tt_global_entry from lists and queue
 *  for free after rcu grace period
 * @ref: kref pointer of the nc_node
 */
static void batadv_tt_global_entry_release(struct kref *ref)
{
	struct batadv_tt_global_entry *tt_global_entry;

	tt_global_entry = container_of(ref, struct batadv_tt_global_entry,
				       common.refcount);

	batadv_tt_global_del_orig_list(tt_global_entry);

	call_rcu(&tt_global_entry->common.rcu, batadv_tt_global_entry_free_rcu);
}

/**
 * batadv_tt_global_entry_put - decrement the tt_global_entry refcounter and
 *  possibly release it
 * @tt_global_entry: tt_global_entry to be free'd
 */
static void
batadv_tt_global_entry_put(struct batadv_tt_global_entry *tt_global_entry)
{
	kref_put(&tt_global_entry->common.refcount,
		 batadv_tt_global_entry_release);
}

/**
 * batadv_tt_global_hash_count - count the number of orig entries
 * @bat_priv: the bat priv with all the soft interface information
 * @addr: the mac address of the client to count entries for
 * @vid: VLAN identifier
 *
 * Return: the number of originators advertising the given address/data
 * (excluding ourself).
 */
int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
				const u8 *addr, unsigned short vid)
{
	struct batadv_tt_global_entry *tt_global_entry;
	int count;

	tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
	if (!tt_global_entry)
		return 0;

	count = atomic_read(&tt_global_entry->orig_list_count);
	batadv_tt_global_entry_put(tt_global_entry);

	return count;
}

/**
 * batadv_tt_local_size_mod - change the size by v of the local table identified
 *  by vid
 * @bat_priv: the bat priv with all the soft interface information
 * @vid: the VLAN identifier of the sub-table to change
 * @v: the amount to sum to the local table size
 */
static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
				     unsigned short vid, int v)
{
	struct batadv_softif_vlan *vlan;

	vlan = batadv_softif_vlan_get(bat_priv, vid);
	if (!vlan)
		return;

	atomic_add(v, &vlan->tt.num_entries);

	batadv_softif_vlan_put(vlan);
}

/**
 * batadv_tt_local_size_inc - increase by one the local table size for the given
 *  vid
 * @bat_priv: the bat priv with all the soft interface information
 * @vid: the VLAN identifier
 */
static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
				     unsigned short vid)
{
	batadv_tt_local_size_mod(bat_priv, vid, 1);
}

/**
 * batadv_tt_local_size_dec - decrease by one the local table size for the given
 *  vid
 * @bat_priv: the bat priv with all the soft interface information
 * @vid: the VLAN identifier
 */
static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
				     unsigned short vid)
{
	batadv_tt_local_size_mod(bat_priv, vid, -1);
}

/**
 * batadv_tt_global_size_mod - change the size by v of the global table
 *  for orig_node identified by vid
 * @orig_node: the originator for which the table has to be modified
 * @vid: the VLAN identifier
 * @v: the amount to sum to the global table size
 */
static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
				      unsigned short vid, int v)
{
	struct batadv_orig_node_vlan *vlan;

	vlan = batadv_orig_node_vlan_new(orig_node, vid);
	if (!vlan)
		return;

	if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
		spin_lock_bh(&orig_node->vlan_list_lock);
		if (!hlist_unhashed(&vlan->list)) {
			hlist_del_init_rcu(&vlan->list);
			batadv_orig_node_vlan_put(vlan);
		}
		spin_unlock_bh(&orig_node->vlan_list_lock);
	}

	batadv_orig_node_vlan_put(vlan);
}

/**
 * batadv_tt_global_size_inc - increase by one the global table size for the
 *  given vid
 * @orig_node: the originator which global table size has to be decreased
 * @vid: the vlan identifier
 */
static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
				      unsigned short vid)
{
	batadv_tt_global_size_mod(orig_node, vid, 1);
}

/**
 * batadv_tt_global_size_dec - decrease by one the global table size for the
 *  given vid
 * @orig_node: the originator which global table size has to be decreased
 * @vid: the vlan identifier
 */
static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
				      unsigned short vid)
{
	batadv_tt_global_size_mod(orig_node, vid, -1);
}

/**
 * batadv_tt_orig_list_entry_free_rcu - free the orig_entry
 * @rcu: rcu pointer of the orig_entry
 */
static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
{
	struct batadv_tt_orig_list_entry *orig_entry;

	orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);

	kmem_cache_free(batadv_tt_orig_cache, orig_entry);
}

/**
 * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
 *  queue for free after rcu grace period
 * @ref: kref pointer of the tt orig entry
 */
static void batadv_tt_orig_list_entry_release(struct kref *ref)
{
	struct batadv_tt_orig_list_entry *orig_entry;

	orig_entry = container_of(ref, struct batadv_tt_orig_list_entry,
				  refcount);

	batadv_orig_node_put(orig_entry->orig_node);
	call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
}

/**
 * batadv_tt_orig_list_entry_put - decrement the tt orig entry refcounter and
 *  possibly release it
 * @orig_entry: tt orig entry to be free'd
 */
static void
batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry)
{
	kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release);
}

/**
 * batadv_tt_local_event - store a local TT event (ADD/DEL)
 * @bat_priv: the bat priv with all the soft interface information
 * @tt_local_entry: the TT entry involved in the event
 * @event_flags: flags to store in the event structure
 */
static void batadv_tt_local_event(struct batadv_priv *bat_priv,
				  struct batadv_tt_local_entry *tt_local_entry,
				  u8 event_flags)
{
	struct batadv_tt_change_node *tt_change_node, *entry, *safe;
	struct batadv_tt_common_entry *common = &tt_local_entry->common;
	u8 flags = common->flags | event_flags;
	bool event_removed = false;
	bool del_op_requested, del_op_entry;

	tt_change_node = kmem_cache_alloc(batadv_tt_change_cache, GFP_ATOMIC);
	if (!tt_change_node)
		return;

	tt_change_node->change.flags = flags;
	memset(tt_change_node->change.reserved, 0,
	       sizeof(tt_change_node->change.reserved));
	ether_addr_copy(tt_change_node->change.addr, common->addr);
	tt_change_node->change.vid = htons(common->vid);

	del_op_requested = flags & BATADV_TT_CLIENT_DEL;

	/* check for ADD+DEL or DEL+ADD events */
	spin_lock_bh(&bat_priv->tt.changes_list_lock);
	list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
				 list) {
		if (!batadv_compare_eth(entry->change.addr, common->addr))
			continue;

		/* DEL+ADD in the same orig interval have no effect and can be
		 * removed to avoid silly behaviour on the receiver side. The
		 * other way around (ADD+DEL) can happen in case of roaming of
		 * a client still in the NEW state. Roaming of NEW clients is
		 * now possible due to automatically recognition of "temporary"
		 * clients
		 */
		del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
		if (!del_op_requested && del_op_entry)
			goto del;
		if (del_op_requested && !del_op_entry)
			goto del;

		/* this is a second add in the same originator interval. It
		 * means that flags have been changed: update them!
		 */
		if (!del_op_requested && !del_op_entry)
			entry->change.flags = flags;

		continue;
del:
		list_del(&entry->list);
		kmem_cache_free(batadv_tt_change_cache, entry);
		kmem_cache_free(batadv_tt_change_cache, tt_change_node);
		event_removed = true;
		goto unlock;
	}

	/* track the change in the OGMinterval list */
	list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);

unlock:
	spin_unlock_bh(&bat_priv->tt.changes_list_lock);

	if (event_removed)
		atomic_dec(&bat_priv->tt.local_changes);
	else
		atomic_inc(&bat_priv->tt.local_changes);
}

/**
 * batadv_tt_len - compute length in bytes of given number of tt changes
 * @changes_num: number of tt changes
 *
 * Return: computed length in bytes.
 */
static int batadv_tt_len(int changes_num)
{
	return changes_num * sizeof(struct batadv_tvlv_tt_change);
}

/**
 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
 * @tt_len: available space
 *
 * Return: the number of entries.
 */
static u16 batadv_tt_entries(u16 tt_len)
{
	return tt_len / batadv_tt_len(1);
}

/**
 * batadv_tt_local_table_transmit_size - calculates the local translation table
 *  size when transmitted over the air
 * @bat_priv: the bat priv with all the soft interface information
 *
 * Return: local translation table size in bytes.
 */
static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
{
	u16 num_vlan = 0;
	u16 tt_local_entries = 0;
	struct batadv_softif_vlan *vlan;
	int hdr_size;

	rcu_read_lock();
	hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
		num_vlan++;
		tt_local_entries += atomic_read(&vlan->tt.num_entries);
	}
	rcu_read_unlock();

	/* header size of tvlv encapsulated tt response payload */
	hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
	hdr_size += sizeof(struct batadv_tvlv_hdr);
	hdr_size += sizeof(struct batadv_tvlv_tt_data);
	hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);

	return hdr_size + batadv_tt_len(tt_local_entries);
}

static int batadv_tt_local_init(struct batadv_priv *bat_priv)
{
	if (bat_priv->tt.local_hash)
		return 0;

	bat_priv->tt.local_hash = batadv_hash_new(1024);

	if (!bat_priv->tt.local_hash)
		return -ENOMEM;

	batadv_hash_set_lock_class(bat_priv->tt.local_hash,
				   &batadv_tt_local_hash_lock_class_key);

	return 0;
}

static void batadv_tt_global_free(struct batadv_priv *bat_priv,
				  struct batadv_tt_global_entry *tt_global,
				  const char *message)
{
	batadv_dbg(BATADV_DBG_TT, bat_priv,
		   "Deleting global tt entry %pM (vid: %d): %s\n",
		   tt_global->common.addr,
		   BATADV_PRINT_VID(tt_global->common.vid), message);

	batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
			   batadv_choose_tt, &tt_global->common);
	batadv_tt_global_entry_put(tt_global);
}

/**
 * batadv_tt_local_add - add a new client to the local table or update an
 *  existing client
 * @soft_iface: netdev struct of the mesh interface
 * @addr: the mac address of the client to add
 * @vid: VLAN identifier
 * @ifindex: index of the interface where the client is connected to (useful to
 *  identify wireless clients)
 * @mark: the value contained in the skb->mark field of the received packet (if
 *  any)
 *
 * Return: true if the client was successfully added, false otherwise.
 */
bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
			 unsigned short vid, int ifindex, u32 mark)
{
	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
	struct batadv_tt_local_entry *tt_local;
	struct batadv_tt_global_entry *tt_global = NULL;
	struct net *net = dev_net(soft_iface);
	struct batadv_softif_vlan *vlan;
	struct net_device *in_dev = NULL;
	struct hlist_head *head;
	struct batadv_tt_orig_list_entry *orig_entry;
	int hash_added, table_size, packet_size_max;
	bool ret = false;
	bool roamed_back = false;
	u8 remote_flags;
	u32 match_mark;

	if (ifindex != BATADV_NULL_IFINDEX)
		in_dev = dev_get_by_index(net, ifindex);

	tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);

	if (!is_multicast_ether_addr(addr))
		tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);

	if (tt_local) {
		tt_local->last_seen = jiffies;
		if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
			batadv_dbg(BATADV_DBG_TT, bat_priv,
				   "Re-adding pending client %pM (vid: %d)\n",
				   addr, BATADV_PRINT_VID(vid));
			/* whatever the reason why the PENDING flag was set,
			 * this is a client which was enqueued to be removed in
			 * this orig_interval. Since it popped up again, the
			 * flag can be reset like it was never enqueued
			 */
			tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
			goto add_event;
		}

		if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
			batadv_dbg(BATADV_DBG_TT, bat_priv,
				   "Roaming client %pM (vid: %d) came back to its original location\n",
				   addr, BATADV_PRINT_VID(vid));
			/* the ROAM flag is set because this client roamed away
			 * and the node got a roaming_advertisement message. Now
			 * that the client popped up again at its original
			 * location such flag can be unset
			 */
			tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
			roamed_back = true;
		}
		goto check_roaming;
	}

	/* Ignore the client if we cannot send it in a full table response. */
	table_size = batadv_tt_local_table_transmit_size(bat_priv);
	table_size += batadv_tt_len(1);
	packet_size_max = atomic_read(&bat_priv->packet_size_max);
	if (table_size > packet_size_max) {
		net_ratelimited_function(batadv_info, soft_iface,
					 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
					 table_size, packet_size_max, addr);
		goto out;
	}

	tt_local = kmem_cache_alloc(batadv_tl_cache, GFP_ATOMIC);
	if (!tt_local)
		goto out;

	/* increase the refcounter of the related vlan */
	vlan = batadv_softif_vlan_get(bat_priv, vid);
	if (!vlan) {
		net_ratelimited_function(batadv_info, soft_iface,
					 "adding TT local entry %pM to non-existent VLAN %d\n",
					 addr, BATADV_PRINT_VID(vid));
		kmem_cache_free(batadv_tl_cache, tt_local);
		tt_local = NULL;
		goto out;
	}

	batadv_dbg(BATADV_DBG_TT, bat_priv,
		   "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
		   addr, BATADV_PRINT_VID(vid),
		   (u8)atomic_read(&bat_priv->tt.vn));

	ether_addr_copy(tt_local->common.addr, addr);
	/* The local entry has to be marked as NEW to avoid to send it in
	 * a full table response going out before the next ttvn increment
	 * (consistency check)
	 */
	tt_local->common.flags = BATADV_TT_CLIENT_NEW;
	tt_local->common.vid = vid;
	if (batadv_is_wifi_netdev(in_dev))
		tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
	kref_init(&tt_local->common.refcount);
	tt_local->last_seen = jiffies;
	tt_local->common.added_at = tt_local->last_seen;
	tt_local->vlan = vlan;

	/* the batman interface mac and multicast addresses should never be
	 * purged
	 */
	if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
	    is_multicast_ether_addr(addr))
		tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;

	kref_get(&tt_local->common.refcount);
	hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
				     batadv_choose_tt, &tt_local->common,
				     &tt_local->common.hash_entry);

	if (unlikely(hash_added != 0)) {
		/* remove the reference for the hash */
		batadv_tt_local_entry_put(tt_local);
		goto out;
	}

add_event:
	batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);

check_roaming:
	/* Check whether it is a roaming, but don't do anything if the roaming
	 * process has already been handled
	 */
	if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
		/* These node are probably going to update their tt table */
		head = &tt_global->orig_list;
		rcu_read_lock();
		hlist_for_each_entry_rcu(orig_entry, head, list) {
			batadv_send_roam_adv(bat_priv, tt_global->common.addr,
					     tt_global->common.vid,
					     orig_entry->orig_node);
		}
		rcu_read_unlock();
		if (roamed_back) {
			batadv_tt_global_free(bat_priv, tt_global,
					      "Roaming canceled");
			tt_global = NULL;
		} else {
			/* The global entry has to be marked as ROAMING and
			 * has to be kept for consistency purpose
			 */
			tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
			tt_global->roam_at = jiffies;
		}
	}

	/* store the current remote flags before altering them. This helps
	 * understanding is flags are changing or not
	 */
	remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;

	if (batadv_is_wifi_netdev(in_dev))
		tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
	else
		tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;

	/* check the mark in the skb: if it's equal to the configured
	 * isolation_mark, it means the packet is coming from an isolated
	 * non-mesh client
	 */
	match_mark = (mark & bat_priv->isolation_mark_mask);
	if (bat_priv->isolation_mark_mask &&
	    match_mark == bat_priv->isolation_mark)
		tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
	else
		tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;

	/* if any "dynamic" flag has been modified, resend an ADD event for this
	 * entry so that all the nodes can get the new flags
	 */
	if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
		batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);

	ret = true;
out:
	if (in_dev)
		dev_put(in_dev);
	if (tt_local)
		batadv_tt_local_entry_put(tt_local);
	if (tt_global)
		batadv_tt_global_entry_put(tt_global);
	return ret;
}

/**
 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
 *  within a TT Response directed to another node
 * @orig_node: originator for which the TT data has to be prepared
 * @tt_data: uninitialised pointer to the address of the TVLV buffer
 * @tt_change: uninitialised pointer to the address of the area where the TT
 *  changed can be stored
 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 *  function reserves the amount of space needed to send the entire global TT
 *  table. In case of success the value is updated with the real amount of
 *  reserved bytes
 * Allocate the needed amount of memory for the entire TT TVLV and write its
 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 * objects, one per active VLAN served by the originator node.
 *
 * Return: the size of the allocated buffer or 0 in case of failure.
 */
static u16
batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
				   struct batadv_tvlv_tt_data **tt_data,
				   struct batadv_tvlv_tt_change **tt_change,
				   s32 *tt_len)
{
	u16 num_vlan = 0;
	u16 num_entries = 0;
	u16 change_offset;
	u16 tvlv_len;
	struct batadv_tvlv_tt_vlan_data *tt_vlan;
	struct batadv_orig_node_vlan *vlan;
	u8 *tt_change_ptr;

	rcu_read_lock();
	hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
		num_vlan++;
		num_entries += atomic_read(&vlan->tt.num_entries);
	}

	change_offset = sizeof(**tt_data);
	change_offset += num_vlan * sizeof(*tt_vlan);

	/* if tt_len is negative, allocate the space needed by the full table */
	if (*tt_len < 0)
		*tt_len = batadv_tt_len(num_entries);

	tvlv_len = *tt_len;
	tvlv_len += change_offset;

	*tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
	if (!*tt_data) {
		*tt_len = 0;
		goto out;
	}

	(*tt_data)->flags = BATADV_NO_FLAGS;
	(*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
	(*tt_data)->num_vlan = htons(num_vlan);

	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
	hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
		tt_vlan->vid = htons(vlan->vid);
		tt_vlan->crc = htonl(vlan->tt.crc);

		tt_vlan++;
	}

	tt_change_ptr = (u8 *)*tt_data + change_offset;
	*tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;

out:
	rcu_read_unlock();
	return tvlv_len;
}

/**
 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
 *  node
 * @bat_priv: the bat priv with all the soft interface information
 * @tt_data: uninitialised pointer to the address of the TVLV buffer
 * @tt_change: uninitialised pointer to the address of the area where the TT
 *  changes can be stored
 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 *  function reserves the amount of space needed to send the entire local TT
 *  table. In case of success the value is updated with the real amount of
 *  reserved bytes
 *
 * Allocate the needed amount of memory for the entire TT TVLV and write its
 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 * objects, one per active VLAN.
 *
 * Return: the size of the allocated buffer or 0 in case of failure.
 */
static u16
batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
				  struct batadv_tvlv_tt_data **tt_data,
				  struct batadv_tvlv_tt_change **tt_change,
				  s32 *tt_len)
{
	struct batadv_tvlv_tt_vlan_data *tt_vlan;
	struct batadv_softif_vlan *vlan;
	u16 num_vlan = 0;
	u16 num_entries = 0;
	u16 tvlv_len;
	u8 *tt_change_ptr;
	int change_offset;

	rcu_read_lock();
	hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
		num_vlan++;
		num_entries += atomic_read(&vlan->tt.num_entries);
	}

	change_offset = sizeof(**tt_data);
	change_offset += num_vlan * sizeof(*tt_vlan);

	/* if tt_len is negative, allocate the space needed by the full table */
	if (*tt_len < 0)
		*tt_len = batadv_tt_len(num_entries);

	tvlv_len = *tt_len;
	tvlv_len += change_offset;

	*tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
	if (!*tt_data) {
		tvlv_len = 0;
		goto out;
	}

	(*tt_data)->flags = BATADV_NO_FLAGS;
	(*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
	(*tt_data)->num_vlan = htons(num_vlan);

	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
	hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
		tt_vlan->vid = htons(vlan->vid);
		tt_vlan->crc = htonl(vlan->tt.crc);

		tt_vlan++;
	}

	tt_change_ptr = (u8 *)*tt_data + change_offset;
	*tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;

out:
	rcu_read_unlock();
	return tvlv_len;
}

/**
 * batadv_tt_tvlv_container_update - update the translation table tvlv container
 *  after local tt changes have been committed
 * @bat_priv: the bat priv with all the soft interface information
 */
static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
{
	struct batadv_tt_change_node *entry, *safe;
	struct batadv_tvlv_tt_data *tt_data;
	struct batadv_tvlv_tt_change *tt_change;
	int tt_diff_len, tt_change_len = 0;
	int tt_diff_entries_num = 0;
	int tt_diff_entries_count = 0;
	u16 tvlv_len;

	tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
	tt_diff_len = batadv_tt_len(tt_diff_entries_num);

	/* if we have too many changes for one packet don't send any
	 * and wait for the tt table request which will be fragmented
	 */
	if (tt_diff_len > bat_priv->soft_iface->mtu)
		tt_diff_len = 0;

	tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
						     &tt_change, &tt_diff_len);
	if (!tvlv_len)
		return;

	tt_data->flags = BATADV_TT_OGM_DIFF;

	if (tt_diff_len == 0)
		goto container_register;

	spin_lock_bh(&bat_priv->tt.changes_list_lock);
	atomic_set(&bat_priv->tt.local_changes, 0);

	list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
				 list) {
		if (tt_diff_entries_count < tt_diff_entries_num) {
			memcpy(tt_change + tt_diff_entries_count,
			       &entry->change,
			       sizeof(struct batadv_tvlv_tt_change));
			tt_diff_entries_count++;
		}
		list_del(&entry->list);
		kmem_cache_free(batadv_tt_change_cache, entry);
	}
	spin_unlock_bh(&bat_priv->tt.changes_list_lock);

	/* Keep the buffer for possible tt_request */
	spin_lock_bh(&bat_priv->tt.last_changeset_lock);
	kfree(bat_priv->tt.last_changeset);
	bat_priv->tt.last_changeset_len = 0;
	bat_priv->tt.last_changeset = NULL;
	tt_change_len = batadv_tt_len(tt_diff_entries_count);
	/* check whether this new OGM has no changes due to size problems */
	if (tt_diff_entries_count > 0) {
		/* if kmalloc() fails we will reply with the full table
		 * instead of providing the diff
		 */
		bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
		if (bat_priv->tt.last_changeset) {
			memcpy(bat_priv->tt.last_changeset,
			       tt_change, tt_change_len);
			bat_priv->tt.last_changeset_len = tt_diff_len;
		}
	}
	spin_unlock_bh(&bat_priv->tt.last_changeset_lock);

container_register:
	batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
				       tvlv_len);
	kfree(tt_data);
}

#ifdef CONFIG_BATMAN_ADV_DEBUGFS
int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
{
	struct net_device *net_dev = (struct net_device *)seq->private;
	struct batadv_priv *bat_priv = netdev_priv(net_dev);
	struct batadv_hashtable *hash = bat_priv->tt.local_hash;
	struct batadv_tt_common_entry *tt_common_entry;
	struct batadv_tt_local_entry *tt_local;
	struct batadv_hard_iface *primary_if;
	struct hlist_head *head;
	u32 i;
	int last_seen_secs;
	int last_seen_msecs;
	unsigned long last_seen_jiffies;
	bool no_purge;
	u16 np_flag = BATADV_TT_CLIENT_NOPURGE;

	primary_if = batadv_seq_print_text_primary_if_get(seq);
	if (!primary_if)
		goto out;

	seq_printf(seq,
		   "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
		   net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
	seq_puts(seq,
		 "       Client         VID Flags    Last seen (CRC       )\n");

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];

		rcu_read_lock();
		hlist_for_each_entry_rcu(tt_common_entry,
					 head, hash_entry) {
			tt_local = container_of(tt_common_entry,
						struct batadv_tt_local_entry,
						common);
			last_seen_jiffies = jiffies - tt_local->last_seen;
			last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
			last_seen_secs = last_seen_msecs / 1000;
			last_seen_msecs = last_seen_msecs % 1000;

			no_purge = tt_common_entry->flags & np_flag;
			seq_printf(seq,
				   " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
				   tt_common_entry->addr,
				   BATADV_PRINT_VID(tt_common_entry->vid),
				   ((tt_common_entry->flags &
				     BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
				   no_purge ? 'P' : '.',
				   ((tt_common_entry->flags &
				     BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
				   ((tt_common_entry->flags &
				     BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
				   ((tt_common_entry->flags &
				     BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
				   ((tt_common_entry->flags &
				     BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
				   no_purge ? 0 : last_seen_secs,
				   no_purge ? 0 : last_seen_msecs,
				   tt_local->vlan->tt.crc);
		}
		rcu_read_unlock();
	}
out:
	if (primary_if)
		batadv_hardif_put(primary_if);
	return 0;
}
#endif

/**
 * batadv_tt_local_dump_entry - Dump one TT local entry into a message
 * @msg :Netlink message to dump into
 * @portid: Port making netlink request
 * @seq: Sequence number of netlink message
 * @bat_priv: The bat priv with all the soft interface information
 * @common: tt local & tt global common data
 *
 * Return: Error code, or 0 on success
 */
static int
batadv_tt_local_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
			   struct batadv_priv *bat_priv,
			   struct batadv_tt_common_entry *common)
{
	void *hdr;
	struct batadv_softif_vlan *vlan;
	struct batadv_tt_local_entry *local;
	unsigned int last_seen_msecs;
	u32 crc;

	local = container_of(common, struct batadv_tt_local_entry, common);
	last_seen_msecs = jiffies_to_msecs(jiffies - local->last_seen);

	vlan = batadv_softif_vlan_get(bat_priv, common->vid);
	if (!vlan)
		return 0;

	crc = vlan->tt.crc;

	batadv_softif_vlan_put(vlan);

	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
			  NLM_F_MULTI,
			  BATADV_CMD_GET_TRANSTABLE_LOCAL);
	if (!hdr)
		return -ENOBUFS;

	if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
	    nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
	    nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
	    nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags))
		goto nla_put_failure;

	if (!(common->flags & BATADV_TT_CLIENT_NOPURGE) &&
	    nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, last_seen_msecs))
		goto nla_put_failure;

	genlmsg_end(msg, hdr);
	return 0;

 nla_put_failure:
	genlmsg_cancel(msg, hdr);
	return -EMSGSIZE;
}

/**
 * batadv_tt_local_dump_bucket - Dump one TT local bucket into a message
 * @msg: Netlink message to dump into
 * @portid: Port making netlink request
 * @seq: Sequence number of netlink message
 * @bat_priv: The bat priv with all the soft interface information
 * @head: Pointer to the list containing the local tt entries
 * @idx_s: Number of entries to skip
 *
 * Return: Error code, or 0 on success
 */
static int
batadv_tt_local_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
			    struct batadv_priv *bat_priv,
			    struct hlist_head *head, int *idx_s)
{
	struct batadv_tt_common_entry *common;
	int idx = 0;

	rcu_read_lock();
	hlist_for_each_entry_rcu(common, head, hash_entry) {
		if (idx++ < *idx_s)
			continue;

		if (batadv_tt_local_dump_entry(msg, portid, seq, bat_priv,
					       common)) {
			rcu_read_unlock();
			*idx_s = idx - 1;
			return -EMSGSIZE;
		}
	}
	rcu_read_unlock();

	*idx_s = 0;
	return 0;
}

/**
 * batadv_tt_local_dump - Dump TT local entries into a message
 * @msg: Netlink message to dump into
 * @cb: Parameters from query
 *
 * Return: Error code, or 0 on success
 */
int batadv_tt_local_dump(struct sk_buff *msg, struct netlink_callback *cb)
{
	struct net *net = sock_net(cb->skb->sk);
	struct net_device *soft_iface;
	struct batadv_priv *bat_priv;
	struct batadv_hard_iface *primary_if = NULL;
	struct batadv_hashtable *hash;
	struct hlist_head *head;
	int ret;
	int ifindex;
	int bucket = cb->args[0];
	int idx = cb->args[1];
	int portid = NETLINK_CB(cb->skb).portid;

	ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
	if (!ifindex)
		return -EINVAL;

	soft_iface = dev_get_by_index(net, ifindex);
	if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
		ret = -ENODEV;
		goto out;
	}

	bat_priv = netdev_priv(soft_iface);

	primary_if = batadv_primary_if_get_selected(bat_priv);
	if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
		ret = -ENOENT;
		goto out;
	}

	hash = bat_priv->tt.local_hash;

	while (bucket < hash->size) {
		head = &hash->table[bucket];

		if (batadv_tt_local_dump_bucket(msg, portid, cb->nlh->nlmsg_seq,
						bat_priv, head, &idx))
			break;

		bucket++;
	}

	ret = msg->len;

 out:
	if (primary_if)
		batadv_hardif_put(primary_if);
	if (soft_iface)
		dev_put(soft_iface);

	cb->args[0] = bucket;
	cb->args[1] = idx;

	return ret;
}

static void
batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
			    struct batadv_tt_local_entry *tt_local_entry,
			    u16 flags, const char *message)
{
	batadv_tt_local_event(bat_priv, tt_local_entry, flags);

	/* The local client has to be marked as "pending to be removed" but has
	 * to be kept in the table in order to send it in a full table
	 * response issued before the net ttvn increment (consistency check)
	 */
	tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;

	batadv_dbg(BATADV_DBG_TT, bat_priv,
		   "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
		   tt_local_entry->common.addr,
		   BATADV_PRINT_VID(tt_local_entry->common.vid), message);
}

/**
 * batadv_tt_local_remove - logically remove an entry from the local table
 * @bat_priv: the bat priv with all the soft interface information
 * @addr: the MAC address of the client to remove
 * @vid: VLAN identifier
 * @message: message to append to the log on deletion
 * @roaming: true if the deletion is due to a roaming event
 *
 * Return: the flags assigned to the local entry before being deleted
 */
u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
			   unsigned short vid, const char *message,
			   bool roaming)
{
	struct batadv_tt_local_entry *tt_local_entry;
	u16 flags, curr_flags = BATADV_NO_FLAGS;
	void *tt_entry_exists;

	tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
	if (!tt_local_entry)
		goto out;

	curr_flags = tt_local_entry->common.flags;

	flags = BATADV_TT_CLIENT_DEL;
	/* if this global entry addition is due to a roaming, the node has to
	 * mark the local entry as "roamed" in order to correctly reroute
	 * packets later
	 */
	if (roaming) {
		flags |= BATADV_TT_CLIENT_ROAM;
		/* mark the local client as ROAMed */
		tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
	}

	if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
		batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
					    message);
		goto out;
	}
	/* if this client has been added right now, it is possible to
	 * immediately purge it
	 */
	batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);

	tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
					     batadv_compare_tt,
					     batadv_choose_tt,
					     &tt_local_entry->common);
	if (!tt_entry_exists)
		goto out;

	/* extra call to free the local tt entry */
	batadv_tt_local_entry_put(tt_local_entry);

out:
	if (tt_local_entry)
		batadv_tt_local_entry_put(tt_local_entry);

	return curr_flags;
}

/**
 * batadv_tt_local_purge_list - purge inactive tt local entries
 * @bat_priv: the bat priv with all the soft interface information
 * @head: pointer to the list containing the local tt entries
 * @timeout: parameter deciding whether a given tt local entry is considered
 *  inactive or not
 */
static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
				       struct hlist_head *head,
				       int timeout)
{
	struct batadv_tt_local_entry *tt_local_entry;
	struct batadv_tt_common_entry *tt_common_entry;
	struct hlist_node *node_tmp;

	hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
				  hash_entry) {
		tt_local_entry = container_of(tt_common_entry,
					      struct batadv_tt_local_entry,
					      common);
		if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
			continue;

		/* entry already marked for deletion */
		if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
			continue;

		if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
			continue;

		batadv_tt_local_set_pending(bat_priv, tt_local_entry,
					    BATADV_TT_CLIENT_DEL, "timed out");
	}
}

/**
 * batadv_tt_local_purge - purge inactive tt local entries
 * @bat_priv: the bat priv with all the soft interface information
 * @timeout: parameter deciding whether a given tt local entry is considered
 *  inactive or not
 */
static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
				  int timeout)
{
	struct batadv_hashtable *hash = bat_priv->tt.local_hash;
	struct hlist_head *head;
	spinlock_t *list_lock; /* protects write access to the hash lists */
	u32 i;

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];
		list_lock = &hash->list_locks[i];

		spin_lock_bh(list_lock);
		batadv_tt_local_purge_list(bat_priv, head, timeout);
		spin_unlock_bh(list_lock);
	}
}

static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
{
	struct batadv_hashtable *hash;
	spinlock_t *list_lock; /* protects write access to the hash lists */
	struct batadv_tt_common_entry *tt_common_entry;
	struct batadv_tt_local_entry *tt_local;
	struct hlist_node *node_tmp;
	struct hlist_head *head;
	u32 i;

	if (!bat_priv->tt.local_hash)
		return;

	hash = bat_priv->tt.local_hash;

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];
		list_lock = &hash->list_locks[i];

		spin_lock_bh(list_lock);
		hlist_for_each_entry_safe(tt_common_entry, node_tmp,
					  head, hash_entry) {
			hlist_del_rcu(&tt_common_entry->hash_entry);
			tt_local = container_of(tt_common_entry,
						struct batadv_tt_local_entry,
						common);

			batadv_tt_local_entry_put(tt_local);
		}
		spin_unlock_bh(list_lock);
	}

	batadv_hash_destroy(hash);

	bat_priv->tt.local_hash = NULL;
}

static int batadv_tt_global_init(struct batadv_priv *bat_priv)
{
	if (bat_priv->tt.global_hash)
		return 0;

	bat_priv->tt.global_hash = batadv_hash_new(1024);

	if (!bat_priv->tt.global_hash)
		return -ENOMEM;

	batadv_hash_set_lock_class(bat_priv->tt.global_hash,
				   &batadv_tt_global_hash_lock_class_key);

	return 0;
}

static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
{
	struct batadv_tt_change_node *entry, *safe;

	spin_lock_bh(&bat_priv->tt.changes_list_lock);

	list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
				 list) {
		list_del(&entry->list);
		kmem_cache_free(batadv_tt_change_cache, entry);
	}

	atomic_set(&bat_priv->tt.local_changes, 0);
	spin_unlock_bh(&bat_priv->tt.changes_list_lock);
}

/**
 * batadv_tt_global_orig_entry_find - find a TT orig_list_entry
 * @entry: the TT global entry where the orig_list_entry has to be
 *  extracted from
 * @orig_node: the originator for which the orig_list_entry has to be found
 *
 * retrieve the orig_tt_list_entry belonging to orig_node from the
 * batadv_tt_global_entry list
 *
 * Return: it with an increased refcounter, NULL if not found
 */
static struct batadv_tt_orig_list_entry *
batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
				 const struct batadv_orig_node *orig_node)
{
	struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
	const struct hlist_head *head;

	rcu_read_lock();
	head = &entry->orig_list;
	hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
		if (tmp_orig_entry->orig_node != orig_node)
			continue;
		if (!kref_get_unless_zero(&tmp_orig_entry->refcount))
			continue;

		orig_entry = tmp_orig_entry;
		break;
	}
	rcu_read_unlock();

	return orig_entry;
}

/**
 * batadv_tt_global_entry_has_orig - check if a TT global entry is also handled
 *  by a given originator
 * @entry: the TT global entry to check
 * @orig_node: the originator to search in the list
 *
 * find out if an orig_node is already in the list of a tt_global_entry.
 *
 * Return: true if found, false otherwise
 */
static bool
batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
				const struct batadv_orig_node *orig_node)
{
	struct batadv_tt_orig_list_entry *orig_entry;
	bool found = false;

	orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
	if (orig_entry) {
		found = true;
		batadv_tt_orig_list_entry_put(orig_entry);
	}

	return found;
}

static void
batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
				struct batadv_orig_node *orig_node, int ttvn)
{
	struct batadv_tt_orig_list_entry *orig_entry;

	orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
	if (orig_entry) {
		/* refresh the ttvn: the current value could be a bogus one that
		 * was added during a "temporary client detection"
		 */
		orig_entry->ttvn = ttvn;
		goto out;
	}

	orig_entry = kmem_cache_zalloc(batadv_tt_orig_cache, GFP_ATOMIC);
	if (!orig_entry)
		goto out;

	INIT_HLIST_NODE(&orig_entry->list);
	kref_get(&orig_node->refcount);
	batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
	orig_entry->orig_node = orig_node;
	orig_entry->ttvn = ttvn;
	kref_init(&orig_entry->refcount);

	spin_lock_bh(&tt_global->list_lock);
	kref_get(&orig_entry->refcount);
	hlist_add_head_rcu(&orig_entry->list,
			   &tt_global->orig_list);
	spin_unlock_bh(&tt_global->list_lock);
	atomic_inc(&tt_global->orig_list_count);

out:
	if (orig_entry)
		batadv_tt_orig_list_entry_put(orig_entry);
}

/**
 * batadv_tt_global_add - add a new TT global entry or update an existing one
 * @bat_priv: the bat priv with all the soft interface information
 * @orig_node: the originator announcing the client
 * @tt_addr: the mac address of the non-mesh client
 * @vid: VLAN identifier
 * @flags: TT flags that have to be set for this non-mesh client
 * @ttvn: the tt version number ever announcing this non-mesh client
 *
 * Add a new TT global entry for the given originator. If the entry already
 * exists add a new reference to the given originator (a global entry can have
 * references to multiple originators) and adjust the flags attribute to reflect
 * the function argument.
 * If a TT local entry exists for this non-mesh client remove it.
 *
 * The caller must hold orig_node refcount.
 *
 * Return: true if the new entry has been added, false otherwise
 */
static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
				 struct batadv_orig_node *orig_node,
				 const unsigned char *tt_addr,
				 unsigned short vid, u16 flags, u8 ttvn)
{
	struct batadv_tt_global_entry *tt_global_entry;
	struct batadv_tt_local_entry *tt_local_entry;
	bool ret = false;
	int hash_added;
	struct batadv_tt_common_entry *common;
	u16 local_flags;

	/* ignore global entries from backbone nodes */
	if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
		return true;

	tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
	tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);

	/* if the node already has a local client for this entry, it has to wait
	 * for a roaming advertisement instead of manually messing up the global
	 * table
	 */
	if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
	    !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
		goto out;

	if (!tt_global_entry) {
		tt_global_entry = kmem_cache_zalloc(batadv_tg_cache,
						    GFP_ATOMIC);
		if (!tt_global_entry)
			goto out;

		common = &tt_global_entry->common;
		ether_addr_copy(common->addr, tt_addr);
		common->vid = vid;

		common->flags = flags;
		tt_global_entry->roam_at = 0;
		/* node must store current time in case of roaming. This is
		 * needed to purge this entry out on timeout (if nobody claims
		 * it)
		 */
		if (flags & BATADV_TT_CLIENT_ROAM)
			tt_global_entry->roam_at = jiffies;
		kref_init(&common->refcount);
		common->added_at = jiffies;

		INIT_HLIST_HEAD(&tt_global_entry->orig_list);
		atomic_set(&tt_global_entry->orig_list_count, 0);
		spin_lock_init(&tt_global_entry->list_lock);

		kref_get(&common->refcount);
		hash_added = batadv_hash_add(bat_priv->tt.global_hash,
					     batadv_compare_tt,
					     batadv_choose_tt, common,
					     &common->hash_entry);

		if (unlikely(hash_added != 0)) {
			/* remove the reference for the hash */
			batadv_tt_global_entry_put(tt_global_entry);
			goto out_remove;
		}
	} else {
		common = &tt_global_entry->common;
		/* If there is already a global entry, we can use this one for
		 * our processing.
		 * But if we are trying to add a temporary client then here are
		 * two options at this point:
		 * 1) the global client is not a temporary client: the global
		 *    client has to be left as it is, temporary information
		 *    should never override any already known client state
		 * 2) the global client is a temporary client: purge the
		 *    originator list and add the new one orig_entry
		 */
		if (flags & BATADV_TT_CLIENT_TEMP) {
			if (!(common->flags & BATADV_TT_CLIENT_TEMP))
				goto out;
			if (batadv_tt_global_entry_has_orig(tt_global_entry,
							    orig_node))
				goto out_remove;
			batadv_tt_global_del_orig_list(tt_global_entry);
			goto add_orig_entry;
		}

		/* if the client was temporary added before receiving the first
		 * OGM announcing it, we have to clear the TEMP flag. Also,
		 * remove the previous temporary orig node and re-add it
		 * if required. If the orig entry changed, the new one which
		 * is a non-temporary entry is preferred.
		 */
		if (common->flags & BATADV_TT_CLIENT_TEMP) {
			batadv_tt_global_del_orig_list(tt_global_entry);
			common->flags &= ~BATADV_TT_CLIENT_TEMP;
		}

		/* the change can carry possible "attribute" flags like the
		 * TT_CLIENT_WIFI, therefore they have to be copied in the
		 * client entry
		 */
		common->flags |= flags;

		/* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
		 * one originator left in the list and we previously received a
		 * delete + roaming change for this originator.
		 *
		 * We should first delete the old originator before adding the
		 * new one.
		 */
		if (common->flags & BATADV_TT_CLIENT_ROAM) {
			batadv_tt_global_del_orig_list(tt_global_entry);
			common->flags &= ~BATADV_TT_CLIENT_ROAM;
			tt_global_entry->roam_at = 0;
		}
	}
add_orig_entry:
	/* add the new orig_entry (if needed) or update it */
	batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);

	batadv_dbg(BATADV_DBG_TT, bat_priv,
		   "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
		   common->addr, BATADV_PRINT_VID(common->vid),
		   orig_node->orig);
	ret = true;

out_remove:
	/* Do not remove multicast addresses from the local hash on
	 * global additions
	 */
	if (is_multicast_ether_addr(tt_addr))
		goto out;

	/* remove address from local hash if present */
	local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
					     "global tt received",
					     flags & BATADV_TT_CLIENT_ROAM);
	tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;

	if (!(flags & BATADV_TT_CLIENT_ROAM))
		/* this is a normal global add. Therefore the client is not in a
		 * roaming state anymore.
		 */
		tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;

out:
	if (tt_global_entry)
		batadv_tt_global_entry_put(tt_global_entry);
	if (tt_local_entry)
		batadv_tt_local_entry_put(tt_local_entry);
	return ret;
}

/**
 * batadv_transtable_best_orig - Get best originator list entry from tt entry
 * @bat_priv: the bat priv with all the soft interface information
 * @tt_global_entry: global translation table entry to be analyzed
 *
 * This functon assumes the caller holds rcu_read_lock().
 * Return: best originator list entry or NULL on errors.
 */
static struct batadv_tt_orig_list_entry *
batadv_transtable_best_orig(struct batadv_priv *bat_priv,
			    struct batadv_tt_global_entry *tt_global_entry)
{
	struct batadv_neigh_node *router, *best_router = NULL;
	struct batadv_algo_ops *bao = bat_priv->algo_ops;
	struct hlist_head *head;
	struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;

	head = &tt_global_entry->orig_list;
	hlist_for_each_entry_rcu(orig_entry, head, list) {
		router = batadv_orig_router_get(orig_entry->orig_node,
						BATADV_IF_DEFAULT);
		if (!router)
			continue;

		if (best_router &&
		    bao->neigh.cmp(router, BATADV_IF_DEFAULT, best_router,
				   BATADV_IF_DEFAULT) <= 0) {
			batadv_neigh_node_put(router);
			continue;
		}

		/* release the refcount for the "old" best */
		if (best_router)
			batadv_neigh_node_put(best_router);

		best_entry = orig_entry;
		best_router = router;
	}

	if (best_router)
		batadv_neigh_node_put(best_router);

	return best_entry;
}

#ifdef CONFIG_BATMAN_ADV_DEBUGFS
/**
 * batadv_tt_global_print_entry - print all orig nodes who announce the address
 *  for this global entry
 * @bat_priv: the bat priv with all the soft interface information
 * @tt_global_entry: global translation table entry to be printed
 * @seq: debugfs table seq_file struct
 *
 * This functon assumes the caller holds rcu_read_lock().
 */
static void
batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
			     struct batadv_tt_global_entry *tt_global_entry,
			     struct seq_file *seq)
{
	struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
	struct batadv_tt_common_entry *tt_common_entry;
	struct batadv_orig_node_vlan *vlan;
	struct hlist_head *head;
	u8 last_ttvn;
	u16 flags;

	tt_common_entry = &tt_global_entry->common;
	flags = tt_common_entry->flags;

	best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
	if (best_entry) {
		vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
						 tt_common_entry->vid);
		if (!vlan) {
			seq_printf(seq,
				   " * Cannot retrieve VLAN %d for originator %pM\n",
				   BATADV_PRINT_VID(tt_common_entry->vid),
				   best_entry->orig_node->orig);
			goto print_list;
		}

		last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
		seq_printf(seq,
			   " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
			   '*', tt_global_entry->common.addr,
			   BATADV_PRINT_VID(tt_global_entry->common.vid),
			   best_entry->ttvn, best_entry->orig_node->orig,
			   last_ttvn, vlan->tt.crc,
			   ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
			   ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
			   ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
			   ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));

		batadv_orig_node_vlan_put(vlan);
	}

print_list:
	head = &tt_global_entry->orig_list;

	hlist_for_each_entry_rcu(orig_entry, head, list) {
		if (best_entry == orig_entry)
			continue;

		vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
						 tt_common_entry->vid);
		if (!vlan) {
			seq_printf(seq,
				   " + Cannot retrieve VLAN %d for originator %pM\n",
				   BATADV_PRINT_VID(tt_common_entry->vid),
				   orig_entry->orig_node->orig);
			continue;
		}

		last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
		seq_printf(seq,
			   " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
			   '+', tt_global_entry->common.addr,
			   BATADV_PRINT_VID(tt_global_entry->common.vid),
			   orig_entry->ttvn, orig_entry->orig_node->orig,
			   last_ttvn, vlan->tt.crc,
			   ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
			   ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
			   ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
			   ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));

		batadv_orig_node_vlan_put(vlan);
	}
}

int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
{
	struct net_device *net_dev = (struct net_device *)seq->private;
	struct batadv_priv *bat_priv = netdev_priv(net_dev);
	struct batadv_hashtable *hash = bat_priv->tt.global_hash;
	struct batadv_tt_common_entry *tt_common_entry;
	struct batadv_tt_global_entry *tt_global;
	struct batadv_hard_iface *primary_if;
	struct hlist_head *head;
	u32 i;

	primary_if = batadv_seq_print_text_primary_if_get(seq);
	if (!primary_if)
		goto out;

	seq_printf(seq,
		   "Globally announced TT entries received via the mesh %s\n",
		   net_dev->name);
	seq_puts(seq,
		 "       Client         VID  (TTVN)       Originator      (Curr TTVN) (CRC       ) Flags\n");

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];

		rcu_read_lock();
		hlist_for_each_entry_rcu(tt_common_entry,
					 head, hash_entry) {
			tt_global = container_of(tt_common_entry,
						 struct batadv_tt_global_entry,
						 common);
			batadv_tt_global_print_entry(bat_priv, tt_global, seq);
		}
		rcu_read_unlock();
	}
out:
	if (primary_if)
		batadv_hardif_put(primary_if);
	return 0;
}
#endif

/**
 * batadv_tt_global_dump_subentry - Dump all TT local entries into a message
 * @msg: Netlink message to dump into
 * @portid: Port making netlink request
 * @seq: Sequence number of netlink message
 * @common: tt local & tt global common data
 * @orig: Originator node announcing a non-mesh client
 * @best: Is the best originator for the TT entry
 *
 * Return: Error code, or 0 on success
 */
static int
batadv_tt_global_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
			       struct batadv_tt_common_entry *common,
			       struct batadv_tt_orig_list_entry *orig,
			       bool best)
{
	void *hdr;
	struct batadv_orig_node_vlan *vlan;
	u8 last_ttvn;
	u32 crc;

	vlan = batadv_orig_node_vlan_get(orig->orig_node,
					 common->vid);
	if (!vlan)
		return 0;

	crc = vlan->tt.crc;

	batadv_orig_node_vlan_put(vlan);

	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
			  NLM_F_MULTI,
			  BATADV_CMD_GET_TRANSTABLE_GLOBAL);
	if (!hdr)
		return -ENOBUFS;

	last_ttvn = atomic_read(&orig->orig_node->last_ttvn);

	if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
	    nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
		    orig->orig_node->orig) ||
	    nla_put_u8(msg, BATADV_ATTR_TT_TTVN, orig->ttvn) ||
	    nla_put_u8(msg, BATADV_ATTR_TT_LAST_TTVN, last_ttvn) ||
	    nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
	    nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
	    nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags))
		goto nla_put_failure;

	if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
		goto nla_put_failure;

	genlmsg_end(msg, hdr);
	return 0;

 nla_put_failure:
	genlmsg_cancel(msg, hdr);
	return -EMSGSIZE;
}

/**
 * batadv_tt_global_dump_entry - Dump one TT global entry into a message
 * @msg: Netlink message to dump into
 * @portid: Port making netlink request
 * @seq: Sequence number of netlink message
 * @bat_priv: The bat priv with all the soft interface information
 * @common: tt local & tt global common data
 * @sub_s: Number of entries to skip
 *
 * This function assumes the caller holds rcu_read_lock().
 *
 * Return: Error code, or 0 on success
 */
static int
batadv_tt_global_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
			    struct batadv_priv *bat_priv,
			    struct batadv_tt_common_entry *common, int *sub_s)
{
	struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
	struct batadv_tt_global_entry *global;
	struct hlist_head *head;
	int sub = 0;
	bool best;

	global = container_of(common, struct batadv_tt_global_entry, common);
	best_entry = batadv_transtable_best_orig(bat_priv, global);
	head = &global->orig_list;

	hlist_for_each_entry_rcu(orig_entry, head, list) {
		if (sub++ < *sub_s)
			continue;

		best = (orig_entry == best_entry);

		if (batadv_tt_global_dump_subentry(msg, portid, seq, common,
						   orig_entry, best)) {
			*sub_s = sub - 1;
			return -EMSGSIZE;
		}
	}

	*sub_s = 0;
	return 0;
}

/**
 * batadv_tt_global_dump_bucket - Dump one TT local bucket into a message
 * @msg: Netlink message to dump into
 * @portid: Port making netlink request
 * @seq: Sequence number of netlink message
 * @bat_priv: The bat priv with all the soft interface information
 * @head: Pointer to the list containing the global tt entries
 * @idx_s: Number of entries to skip
 * @sub: Number of entries to skip
 *
 * Return: Error code, or 0 on success
 */
static int
batadv_tt_global_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
			     struct batadv_priv *bat_priv,
			     struct hlist_head *head, int *idx_s, int *sub)
{
	struct batadv_tt_common_entry *common;
	int idx = 0;

	rcu_read_lock();
	hlist_for_each_entry_rcu(common, head, hash_entry) {
		if (idx++ < *idx_s)
			continue;

		if (batadv_tt_global_dump_entry(msg, portid, seq, bat_priv,
						common, sub)) {
			rcu_read_unlock();
			*idx_s = idx - 1;
			return -EMSGSIZE;
		}
	}
	rcu_read_unlock();

	*idx_s = 0;
	*sub = 0;
	return 0;
}

/**
 * batadv_tt_global_dump -  Dump TT global entries into a message
 * @msg: Netlink message to dump into
 * @cb: Parameters from query
 *
 * Return: Error code, or length of message on success
 */
int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb)
{
	struct net *net = sock_net(cb->skb->sk);
	struct net_device *soft_iface;
	struct batadv_priv *bat_priv;
	struct batadv_hard_iface *primary_if = NULL;
	struct batadv_hashtable *hash;
	struct hlist_head *head;
	int ret;
	int ifindex;
	int bucket = cb->args[0];
	int idx = cb->args[1];
	int sub = cb->args[2];
	int portid = NETLINK_CB(cb->skb).portid;

	ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
	if (!ifindex)
		return -EINVAL;

	soft_iface = dev_get_by_index(net, ifindex);
	if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
		ret = -ENODEV;
		goto out;
	}

	bat_priv = netdev_priv(soft_iface);

	primary_if = batadv_primary_if_get_selected(bat_priv);
	if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
		ret = -ENOENT;
		goto out;
	}

	hash = bat_priv->tt.global_hash;

	while (bucket < hash->size) {
		head = &hash->table[bucket];

		if (batadv_tt_global_dump_bucket(msg, portid,
						 cb->nlh->nlmsg_seq, bat_priv,
						 head, &idx, &sub))
			break;

		bucket++;
	}

	ret = msg->len;

 out:
	if (primary_if)
		batadv_hardif_put(primary_if);
	if (soft_iface)
		dev_put(soft_iface);

	cb->args[0] = bucket;
	cb->args[1] = idx;
	cb->args[2] = sub;

	return ret;
}

/**
 * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
 * @tt_global_entry: the global entry to remove the orig_entry from
 * @orig_entry: the orig entry to remove and free
 *
 * Remove an orig_entry from its list in the given tt_global_entry and
 * free this orig_entry afterwards.
 *
 * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
 * part of a list.
 */
static void
_batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
				 struct batadv_tt_orig_list_entry *orig_entry)
{
	lockdep_assert_held(&tt_global_entry->list_lock);

	batadv_tt_global_size_dec(orig_entry->orig_node,
				  tt_global_entry->common.vid);
	atomic_dec(&tt_global_entry->orig_list_count);
	/* requires holding tt_global_entry->list_lock and orig_entry->list
	 * being part of a list
	 */
	hlist_del_rcu(&orig_entry->list);
	batadv_tt_orig_list_entry_put(orig_entry);
}

/* deletes the orig list of a tt_global_entry */
static void
batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
{
	struct hlist_head *head;
	struct hlist_node *safe;
	struct batadv_tt_orig_list_entry *orig_entry;

	spin_lock_bh(&tt_global_entry->list_lock);
	head = &tt_global_entry->orig_list;
	hlist_for_each_entry_safe(orig_entry, safe, head, list)
		_batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
	spin_unlock_bh(&tt_global_entry->list_lock);
}

/**
 * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
 * @bat_priv: the bat priv with all the soft interface information
 * @tt_global_entry: the global entry to remove the orig_node from
 * @orig_node: the originator announcing the client
 * @message: message to append to the log on deletion
 *
 * Remove the given orig_node and its according orig_entry from the given
 * global tt entry.
 */
static void
batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
			       struct batadv_tt_global_entry *tt_global_entry,
			       struct batadv_orig_node *orig_node,
			       const char *message)
{
	struct hlist_head *head;
	struct hlist_node *safe;
	struct batadv_tt_orig_list_entry *orig_entry;
	unsigned short vid;

	spin_lock_bh(&tt_global_entry->list_lock);
	head = &tt_global_entry->orig_list;
	hlist_for_each_entry_safe(orig_entry, safe, head, list) {
		if (orig_entry->orig_node == orig_node) {
			vid = tt_global_entry->common.vid;
			batadv_dbg(BATADV_DBG_TT, bat_priv,
				   "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
				   orig_node->orig,
				   tt_global_entry->common.addr,
				   BATADV_PRINT_VID(vid), message);
			_batadv_tt_global_del_orig_entry(tt_global_entry,
							 orig_entry);
		}
	}
	spin_unlock_bh(&tt_global_entry->list_lock);
}

/* If the client is to be deleted, we check if it is the last origantor entry
 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
 * timer, otherwise we simply remove the originator scheduled for deletion.
 */
static void
batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
			     struct batadv_tt_global_entry *tt_global_entry,
			     struct batadv_orig_node *orig_node,
			     const char *message)
{
	bool last_entry = true;
	struct hlist_head *head;
	struct batadv_tt_orig_list_entry *orig_entry;

	/* no local entry exists, case 1:
	 * Check if this is the last one or if other entries exist.
	 */

	rcu_read_lock();
	head = &tt_global_entry->orig_list;
	hlist_for_each_entry_rcu(orig_entry, head, list) {
		if (orig_entry->orig_node != orig_node) {
			last_entry = false;
			break;
		}
	}
	rcu_read_unlock();

	if (last_entry) {
		/* its the last one, mark for roaming. */
		tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
		tt_global_entry->roam_at = jiffies;
	} else
		/* there is another entry, we can simply delete this
		 * one and can still use the other one.
		 */
		batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
					       orig_node, message);
}

/**
 * batadv_tt_global_del - remove a client from the global table
 * @bat_priv: the bat priv with all the soft interface information
 * @orig_node: an originator serving this client
 * @addr: the mac address of the client
 * @vid: VLAN identifier
 * @message: a message explaining the reason for deleting the client to print
 *  for debugging purpose
 * @roaming: true if the deletion has been triggered by a roaming event
 */
static void batadv_tt_global_del(struct batadv_priv *bat_priv,
				 struct batadv_orig_node *orig_node,
				 const unsigned char *addr, unsigned short vid,
				 const char *message, bool roaming)
{
	struct batadv_tt_global_entry *tt_global_entry;
	struct batadv_tt_local_entry *local_entry = NULL;

	tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
	if (!tt_global_entry)
		goto out;

	if (!roaming) {
		batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
					       orig_node, message);

		if (hlist_empty(&tt_global_entry->orig_list))
			batadv_tt_global_free(bat_priv, tt_global_entry,
					      message);

		goto out;
	}

	/* if we are deleting a global entry due to a roam
	 * event, there are two possibilities:
	 * 1) the client roamed from node A to node B => if there
	 *    is only one originator left for this client, we mark
	 *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
	 *    wait for node B to claim it. In case of timeout
	 *    the entry is purged.
	 *
	 *    If there are other originators left, we directly delete
	 *    the originator.
	 * 2) the client roamed to us => we can directly delete
	 *    the global entry, since it is useless now.
	 */
	local_entry = batadv_tt_local_hash_find(bat_priv,
						tt_global_entry->common.addr,
						vid);
	if (local_entry) {
		/* local entry exists, case 2: client roamed to us. */
		batadv_tt_global_del_orig_list(tt_global_entry);
		batadv_tt_global_free(bat_priv, tt_global_entry, message);
	} else
		/* no local entry exists, case 1: check for roaming */
		batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
					     orig_node, message);

out:
	if (tt_global_entry)
		batadv_tt_global_entry_put(tt_global_entry);
	if (local_entry)
		batadv_tt_local_entry_put(local_entry);
}

/**
 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
 *  given originator matching the provided vid
 * @bat_priv: the bat priv with all the soft interface information
 * @orig_node: the originator owning the entries to remove
 * @match_vid: the VLAN identifier to match. If negative all the entries will be
 *  removed
 * @message: debug message to print as "reason"
 */
void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
			       struct batadv_orig_node *orig_node,
			       s32 match_vid,
			       const char *message)
{
	struct batadv_tt_global_entry *tt_global;
	struct batadv_tt_common_entry *tt_common_entry;
	u32 i;
	struct batadv_hashtable *hash = bat_priv->tt.global_hash;
	struct hlist_node *safe;
	struct hlist_head *head;
	spinlock_t *list_lock; /* protects write access to the hash lists */
	unsigned short vid;

	if (!hash)
		return;

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];
		list_lock = &hash->list_locks[i];

		spin_lock_bh(list_lock);
		hlist_for_each_entry_safe(tt_common_entry, safe,
					  head, hash_entry) {
			/* remove only matching entries */
			if (match_vid >= 0 && tt_common_entry->vid != match_vid)
				continue;

			tt_global = container_of(tt_common_entry,
						 struct batadv_tt_global_entry,
						 common);

			batadv_tt_global_del_orig_node(bat_priv, tt_global,
						       orig_node, message);

			if (hlist_empty(&tt_global->orig_list)) {
				vid = tt_global->common.vid;
				batadv_dbg(BATADV_DBG_TT, bat_priv,
					   "Deleting global tt entry %pM (vid: %d): %s\n",
					   tt_global->common.addr,
					   BATADV_PRINT_VID(vid), message);
				hlist_del_rcu(&tt_common_entry->hash_entry);
				batadv_tt_global_entry_put(tt_global);
			}
		}
		spin_unlock_bh(list_lock);
	}
	clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
}

static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
				      char **msg)
{
	bool purge = false;
	unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
	unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;

	if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
	    batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
		purge = true;
		*msg = "Roaming timeout\n";
	}

	if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
	    batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
		purge = true;
		*msg = "Temporary client timeout\n";
	}

	return purge;
}

static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
{
	struct batadv_hashtable *hash = bat_priv->tt.global_hash;
	struct hlist_head *head;
	struct hlist_node *node_tmp;
	spinlock_t *list_lock; /* protects write access to the hash lists */
	u32 i;
	char *msg = NULL;
	struct batadv_tt_common_entry *tt_common;
	struct batadv_tt_global_entry *tt_global;

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];
		list_lock = &hash->list_locks[i];

		spin_lock_bh(list_lock);
		hlist_for_each_entry_safe(tt_common, node_tmp, head,
					  hash_entry) {
			tt_global = container_of(tt_common,
						 struct batadv_tt_global_entry,
						 common);

			if (!batadv_tt_global_to_purge(tt_global, &msg))
				continue;

			batadv_dbg(BATADV_DBG_TT, bat_priv,
				   "Deleting global tt entry %pM (vid: %d): %s\n",
				   tt_global->common.addr,
				   BATADV_PRINT_VID(tt_global->common.vid),
				   msg);

			hlist_del_rcu(&tt_common->hash_entry);

			batadv_tt_global_entry_put(tt_global);
		}
		spin_unlock_bh(list_lock);
	}
}

static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
{
	struct batadv_hashtable *hash;
	spinlock_t *list_lock; /* protects write access to the hash lists */
	struct batadv_tt_common_entry *tt_common_entry;
	struct batadv_tt_global_entry *tt_global;
	struct hlist_node *node_tmp;
	struct hlist_head *head;
	u32 i;

	if (!bat_priv->tt.global_hash)
		return;

	hash = bat_priv->tt.global_hash;

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];
		list_lock = &hash->list_locks[i];

		spin_lock_bh(list_lock);
		hlist_for_each_entry_safe(tt_common_entry, node_tmp,
					  head, hash_entry) {
			hlist_del_rcu(&tt_common_entry->hash_entry);
			tt_global = container_of(tt_common_entry,
						 struct batadv_tt_global_entry,
						 common);
			batadv_tt_global_entry_put(tt_global);
		}
		spin_unlock_bh(list_lock);
	}

	batadv_hash_destroy(hash);

	bat_priv->tt.global_hash = NULL;
}

static bool
_batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
		       struct batadv_tt_global_entry *tt_global_entry)
{
	bool ret = false;

	if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
	    tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
		ret = true;

	/* check if the two clients are marked as isolated */
	if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
	    tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
		ret = true;

	return ret;
}

/**
 * batadv_transtable_search - get the mesh destination for a given client
 * @bat_priv: the bat priv with all the soft interface information
 * @src: mac address of the source client
 * @addr: mac address of the destination client
 * @vid: VLAN identifier
 *
 * Return: a pointer to the originator that was selected as destination in the
 * mesh for contacting the client 'addr', NULL otherwise.
 * In case of multiple originators serving the same client, the function returns
 * the best one (best in terms of metric towards the destination node).
 *
 * If the two clients are AP isolated the function returns NULL.
 */
struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
						  const u8 *src,
						  const u8 *addr,
						  unsigned short vid)
{
	struct batadv_tt_local_entry *tt_local_entry = NULL;
	struct batadv_tt_global_entry *tt_global_entry = NULL;
	struct batadv_orig_node *orig_node = NULL;
	struct batadv_tt_orig_list_entry *best_entry;

	if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
		tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
		if (!tt_local_entry ||
		    (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
			goto out;
	}

	tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
	if (!tt_global_entry)
		goto out;

	/* check whether the clients should not communicate due to AP
	 * isolation
	 */
	if (tt_local_entry &&
	    _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
		goto out;

	rcu_read_lock();
	best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
	/* found anything? */
	if (best_entry)
		orig_node = best_entry->orig_node;
	if (orig_node && !kref_get_unless_zero(&orig_node->refcount))
		orig_node = NULL;
	rcu_read_unlock();

out:
	if (tt_global_entry)
		batadv_tt_global_entry_put(tt_global_entry);
	if (tt_local_entry)
		batadv_tt_local_entry_put(tt_local_entry);

	return orig_node;
}

/**
 * batadv_tt_global_crc - calculates the checksum of the local table belonging
 *  to the given orig_node
 * @bat_priv: the bat priv with all the soft interface information
 * @orig_node: originator for which the CRC should be computed
 * @vid: VLAN identifier for which the CRC32 has to be computed
 *
 * This function computes the checksum for the global table corresponding to a
 * specific originator. In particular, the checksum is computed as follows: For
 * each client connected to the originator the CRC32C of the MAC address and the
 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
 * together.
 *
 * The idea behind is that CRC32C should be used as much as possible in order to
 * produce a unique hash of the table, but since the order which is used to feed
 * the CRC32C function affects the result and since every node in the network
 * probably sorts the clients differently, the hash function cannot be directly
 * computed over the entire table. Hence the CRC32C is used only on
 * the single client entry, while all the results are then xor'ed together
 * because the XOR operation can combine them all while trying to reduce the
 * noise as much as possible.
 *
 * Return: the checksum of the global table of a given originator.
 */
static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
				struct batadv_orig_node *orig_node,
				unsigned short vid)
{
	struct batadv_hashtable *hash = bat_priv->tt.global_hash;
	struct batadv_tt_common_entry *tt_common;
	struct batadv_tt_global_entry *tt_global;
	struct hlist_head *head;
	u32 i, crc_tmp, crc = 0;
	u8 flags;
	__be16 tmp_vid;

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];

		rcu_read_lock();
		hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
			tt_global = container_of(tt_common,
						 struct batadv_tt_global_entry,
						 common);
			/* compute the CRC only for entries belonging to the
			 * VLAN identified by the vid passed as parameter
			 */
			if (tt_common->vid != vid)
				continue;

			/* Roaming clients are in the global table for
			 * consistency only. They don't have to be
			 * taken into account while computing the
			 * global crc
			 */
			if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
				continue;
			/* Temporary clients have not been announced yet, so
			 * they have to be skipped while computing the global
			 * crc
			 */
			if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
				continue;

			/* find out if this global entry is announced by this
			 * originator
			 */
			if (!batadv_tt_global_entry_has_orig(tt_global,
							     orig_node))
				continue;

			/* use network order to read the VID: this ensures that
			 * every node reads the bytes in the same order.
			 */
			tmp_vid = htons(tt_common->vid);
			crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));

			/* compute the CRC on flags that have to be kept in sync
			 * among nodes
			 */
			flags = tt_common->flags & BATADV_TT_SYNC_MASK;
			crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));

			crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
		}
		rcu_read_unlock();
	}

	return crc;
}

/**
 * batadv_tt_local_crc - calculates the checksum of the local table
 * @bat_priv: the bat priv with all the soft interface information
 * @vid: VLAN identifier for which the CRC32 has to be computed
 *
 * For details about the computation, please refer to the documentation for
 * batadv_tt_global_crc().
 *
 * Return: the checksum of the local table
 */
static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
			       unsigned short vid)
{
	struct batadv_hashtable *hash = bat_priv->tt.local_hash;
	struct batadv_tt_common_entry *tt_common;
	struct hlist_head *head;
	u32 i, crc_tmp, crc = 0;
	u8 flags;
	__be16 tmp_vid;

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];

		rcu_read_lock();
		hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
			/* compute the CRC only for entries belonging to the
			 * VLAN identified by vid
			 */
			if (tt_common->vid != vid)
				continue;

			/* not yet committed clients have not to be taken into
			 * account while computing the CRC
			 */
			if (tt_common->flags & BATADV_TT_CLIENT_NEW)
				continue;

			/* use network order to read the VID: this ensures that
			 * every node reads the bytes in the same order.
			 */
			tmp_vid = htons(tt_common->vid);
			crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));

			/* compute the CRC on flags that have to be kept in sync
			 * among nodes
			 */
			flags = tt_common->flags & BATADV_TT_SYNC_MASK;
			crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));

			crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
		}
		rcu_read_unlock();
	}

	return crc;
}

/**
 * batadv_tt_req_node_release - free tt_req node entry
 * @ref: kref pointer of the tt req_node entry
 */
static void batadv_tt_req_node_release(struct kref *ref)
{
	struct batadv_tt_req_node *tt_req_node;

	tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount);

	kmem_cache_free(batadv_tt_req_cache, tt_req_node);
}

/**
 * batadv_tt_req_node_put - decrement the tt_req_node refcounter and
 *  possibly release it
 * @tt_req_node: tt_req_node to be free'd
 */
static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node)
{
	kref_put(&tt_req_node->refcount, batadv_tt_req_node_release);
}

static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
{
	struct batadv_tt_req_node *node;
	struct hlist_node *safe;

	spin_lock_bh(&bat_priv->tt.req_list_lock);

	hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
		hlist_del_init(&node->list);
		batadv_tt_req_node_put(node);
	}

	spin_unlock_bh(&bat_priv->tt.req_list_lock);
}

static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
				       struct batadv_orig_node *orig_node,
				       const void *tt_buff,
				       u16 tt_buff_len)
{
	/* Replace the old buffer only if I received something in the
	 * last OGM (the OGM could carry no changes)
	 */
	spin_lock_bh(&orig_node->tt_buff_lock);
	if (tt_buff_len > 0) {
		kfree(orig_node->tt_buff);
		orig_node->tt_buff_len = 0;
		orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
		if (orig_node->tt_buff) {
			memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
			orig_node->tt_buff_len = tt_buff_len;
		}
	}
	spin_unlock_bh(&orig_node->tt_buff_lock);
}

static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
{
	struct batadv_tt_req_node *node;
	struct hlist_node *safe;

	spin_lock_bh(&bat_priv->tt.req_list_lock);
	hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
		if (batadv_has_timed_out(node->issued_at,
					 BATADV_TT_REQUEST_TIMEOUT)) {
			hlist_del_init(&node->list);
			batadv_tt_req_node_put(node);
		}
	}
	spin_unlock_bh(&bat_priv->tt.req_list_lock);
}

/**
 * batadv_tt_req_node_new - search and possibly create a tt_req_node object
 * @bat_priv: the bat priv with all the soft interface information
 * @orig_node: orig node this request is being issued for
 *
 * Return: the pointer to the new tt_req_node struct if no request
 * has already been issued for this orig_node, NULL otherwise.
 */
static struct batadv_tt_req_node *
batadv_tt_req_node_new(struct batadv_priv *bat_priv,
		       struct batadv_orig_node *orig_node)
{
	struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;

	spin_lock_bh(&bat_priv->tt.req_list_lock);
	hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
		if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
		    !batadv_has_timed_out(tt_req_node_tmp->issued_at,
					  BATADV_TT_REQUEST_TIMEOUT))
			goto unlock;
	}

	tt_req_node = kmem_cache_alloc(batadv_tt_req_cache, GFP_ATOMIC);
	if (!tt_req_node)
		goto unlock;

	kref_init(&tt_req_node->refcount);
	ether_addr_copy(tt_req_node->addr, orig_node->orig);
	tt_req_node->issued_at = jiffies;

	kref_get(&tt_req_node->refcount);
	hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
unlock:
	spin_unlock_bh(&bat_priv->tt.req_list_lock);
	return tt_req_node;
}

/**
 * batadv_tt_local_valid - verify that given tt entry is a valid one
 * @entry_ptr: to be checked local tt entry
 * @data_ptr: not used but definition required to satisfy the callback prototype
 *
 * Return: true if the entry is a valid, false otherwise.
 */
static bool batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
{
	const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;

	if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
		return false;
	return true;
}

static bool batadv_tt_global_valid(const void *entry_ptr,
				   const void *data_ptr)
{
	const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
	const struct batadv_tt_global_entry *tt_global_entry;
	const struct batadv_orig_node *orig_node = data_ptr;

	if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
	    tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
		return false;

	tt_global_entry = container_of(tt_common_entry,
				       struct batadv_tt_global_entry,
				       common);

	return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
}

/**
 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
 *  specified tt hash
 * @bat_priv: the bat priv with all the soft interface information
 * @hash: hash table containing the tt entries
 * @tt_len: expected tvlv tt data buffer length in number of bytes
 * @tvlv_buff: pointer to the buffer to fill with the TT data
 * @valid_cb: function to filter tt change entries
 * @cb_data: data passed to the filter function as argument
 */
static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
				    struct batadv_hashtable *hash,
				    void *tvlv_buff, u16 tt_len,
				    bool (*valid_cb)(const void *,
						     const void *),
				    void *cb_data)
{
	struct batadv_tt_common_entry *tt_common_entry;
	struct batadv_tvlv_tt_change *tt_change;
	struct hlist_head *head;
	u16 tt_tot, tt_num_entries = 0;
	u32 i;

	tt_tot = batadv_tt_entries(tt_len);
	tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;

	rcu_read_lock();
	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];

		hlist_for_each_entry_rcu(tt_common_entry,
					 head, hash_entry) {
			if (tt_tot == tt_num_entries)
				break;

			if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
				continue;

			ether_addr_copy(tt_change->addr, tt_common_entry->addr);
			tt_change->flags = tt_common_entry->flags;
			tt_change->vid = htons(tt_common_entry->vid);
			memset(tt_change->reserved, 0,
			       sizeof(tt_change->reserved));

			tt_num_entries++;
			tt_change++;
		}
	}
	rcu_read_unlock();
}

/**
 * batadv_tt_global_check_crc - check if all the CRCs are correct
 * @orig_node: originator for which the CRCs have to be checked
 * @tt_vlan: pointer to the first tvlv VLAN entry
 * @num_vlan: number of tvlv VLAN entries
 *
 * Return: true if all the received CRCs match the locally stored ones, false
 * otherwise
 */
static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
				       struct batadv_tvlv_tt_vlan_data *tt_vlan,
				       u16 num_vlan)
{
	struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
	struct batadv_orig_node_vlan *vlan;
	int i, orig_num_vlan;
	u32 crc;

	/* check if each received CRC matches the locally stored one */
	for (i = 0; i < num_vlan; i++) {
		tt_vlan_tmp = tt_vlan + i;

		/* if orig_node is a backbone node for this VLAN, don't check
		 * the CRC as we ignore all the global entries over it
		 */
		if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
						   orig_node->orig,
						   ntohs(tt_vlan_tmp->vid)))
			continue;

		vlan = batadv_orig_node_vlan_get(orig_node,
						 ntohs(tt_vlan_tmp->vid));
		if (!vlan)
			return false;

		crc = vlan->tt.crc;
		batadv_orig_node_vlan_put(vlan);

		if (crc != ntohl(tt_vlan_tmp->crc))
			return false;
	}

	/* check if any excess VLANs exist locally for the originator
	 * which are not mentioned in the TVLV from the originator.
	 */
	rcu_read_lock();
	orig_num_vlan = 0;
	hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
		orig_num_vlan++;
	rcu_read_unlock();

	if (orig_num_vlan > num_vlan)
		return false;

	return true;
}

/**
 * batadv_tt_local_update_crc - update all the local CRCs
 * @bat_priv: the bat priv with all the soft interface information
 */
static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
{
	struct batadv_softif_vlan *vlan;

	/* recompute the global CRC for each VLAN */
	rcu_read_lock();
	hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
		vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
	}
	rcu_read_unlock();
}

/**
 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
 * @bat_priv: the bat priv with all the soft interface information
 * @orig_node: the orig_node for which the CRCs have to be updated
 */
static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
					struct batadv_orig_node *orig_node)
{
	struct batadv_orig_node_vlan *vlan;
	u32 crc;

	/* recompute the global CRC for each VLAN */
	rcu_read_lock();
	hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
		/* if orig_node is a backbone node for this VLAN, don't compute
		 * the CRC as we ignore all the global entries over it
		 */
		if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
						   vlan->vid))
			continue;

		crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
		vlan->tt.crc = crc;
	}
	rcu_read_unlock();
}

/**
 * batadv_send_tt_request - send a TT Request message to a given node
 * @bat_priv: the bat priv with all the soft interface information
 * @dst_orig_node: the destination of the message
 * @ttvn: the version number that the source of the message is looking for
 * @tt_vlan: pointer to the first tvlv VLAN object to request
 * @num_vlan: number of tvlv VLAN entries
 * @full_table: ask for the entire translation table if true, while only for the
 *  last TT diff otherwise
 *
 * Return: true if the TT Request was sent, false otherwise
 */
static bool batadv_send_tt_request(struct batadv_priv *bat_priv,
				   struct batadv_orig_node *dst_orig_node,
				   u8 ttvn,
				   struct batadv_tvlv_tt_vlan_data *tt_vlan,
				   u16 num_vlan, bool full_table)
{
	struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
	struct batadv_tt_req_node *tt_req_node = NULL;
	struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
	struct batadv_hard_iface *primary_if;
	bool ret = false;
	int i, size;

	primary_if = batadv_primary_if_get_selected(bat_priv);
	if (!primary_if)
		goto out;

	/* The new tt_req will be issued only if I'm not waiting for a
	 * reply from the same orig_node yet
	 */
	tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
	if (!tt_req_node)
		goto out;

	size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
	tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
	if (!tvlv_tt_data)
		goto out;

	tvlv_tt_data->flags = BATADV_TT_REQUEST;
	tvlv_tt_data->ttvn = ttvn;
	tvlv_tt_data->num_vlan = htons(num_vlan);

	/* send all the CRCs within the request. This is needed by intermediate
	 * nodes to ensure they have the correct table before replying
	 */
	tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
	for (i = 0; i < num_vlan; i++) {
		tt_vlan_req->vid = tt_vlan->vid;
		tt_vlan_req->crc = tt_vlan->crc;

		tt_vlan_req++;
		tt_vlan++;
	}

	if (full_table)
		tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;

	batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
		   dst_orig_node->orig, full_table ? 'F' : '.');

	batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
	batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
				 dst_orig_node->orig, BATADV_TVLV_TT, 1,
				 tvlv_tt_data, size);
	ret = true;

out:
	if (primary_if)
		batadv_hardif_put(primary_if);

	if (ret && tt_req_node) {
		spin_lock_bh(&bat_priv->tt.req_list_lock);
		if (!hlist_unhashed(&tt_req_node->list)) {
			hlist_del_init(&tt_req_node->list);
			batadv_tt_req_node_put(tt_req_node);
		}
		spin_unlock_bh(&bat_priv->tt.req_list_lock);
	}

	if (tt_req_node)
		batadv_tt_req_node_put(tt_req_node);

	kfree(tvlv_tt_data);
	return ret;
}

/**
 * batadv_send_other_tt_response - send reply to tt request concerning another
 *  node's translation table
 * @bat_priv: the bat priv with all the soft interface information
 * @tt_data: tt data containing the tt request information
 * @req_src: mac address of tt request sender
 * @req_dst: mac address of tt request recipient
 *
 * Return: true if tt request reply was sent, false otherwise.
 */
static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
					  struct batadv_tvlv_tt_data *tt_data,
					  u8 *req_src, u8 *req_dst)
{
	struct batadv_orig_node *req_dst_orig_node;
	struct batadv_orig_node *res_dst_orig_node = NULL;
	struct batadv_tvlv_tt_change *tt_change;
	struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
	struct batadv_tvlv_tt_vlan_data *tt_vlan;
	bool ret = false, full_table;
	u8 orig_ttvn, req_ttvn;
	u16 tvlv_len;
	s32 tt_len;

	batadv_dbg(BATADV_DBG_TT, bat_priv,
		   "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
		   req_src, tt_data->ttvn, req_dst,
		   ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));

	/* Let's get the orig node of the REAL destination */
	req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
	if (!req_dst_orig_node)
		goto out;

	res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
	if (!res_dst_orig_node)
		goto out;

	orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
	req_ttvn = tt_data->ttvn;

	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
	/* this node doesn't have the requested data */
	if (orig_ttvn != req_ttvn ||
	    !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
					ntohs(tt_data->num_vlan)))
		goto out;

	/* If the full table has been explicitly requested */
	if (tt_data->flags & BATADV_TT_FULL_TABLE ||
	    !req_dst_orig_node->tt_buff)
		full_table = true;
	else
		full_table = false;

	/* TT fragmentation hasn't been implemented yet, so send as many
	 * TT entries fit a single packet as possible only
	 */
	if (!full_table) {
		spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
		tt_len = req_dst_orig_node->tt_buff_len;

		tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
							      &tvlv_tt_data,
							      &tt_change,
							      &tt_len);
		if (!tt_len)
			goto unlock;

		/* Copy the last orig_node's OGM buffer */
		memcpy(tt_change, req_dst_orig_node->tt_buff,
		       req_dst_orig_node->tt_buff_len);
		spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
	} else {
		/* allocate the tvlv, put the tt_data and all the tt_vlan_data
		 * in the initial part
		 */
		tt_len = -1;
		tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
							      &tvlv_tt_data,
							      &tt_change,
							      &tt_len);
		if (!tt_len)
			goto out;

		/* fill the rest of the tvlv with the real TT entries */
		batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
					tt_change, tt_len,
					batadv_tt_global_valid,
					req_dst_orig_node);
	}

	/* Don't send the response, if larger than fragmented packet. */
	tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
	if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
		net_ratelimited_function(batadv_info, bat_priv->soft_iface,
					 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
					 res_dst_orig_node->orig);
		goto out;
	}

	tvlv_tt_data->flags = BATADV_TT_RESPONSE;
	tvlv_tt_data->ttvn = req_ttvn;

	if (full_table)
		tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;

	batadv_dbg(BATADV_DBG_TT, bat_priv,
		   "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
		   res_dst_orig_node->orig, req_dst_orig_node->orig,
		   full_table ? 'F' : '.', req_ttvn);

	batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);

	batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
				 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
				 tvlv_len);

	ret = true;
	goto out;

unlock:
	spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);

out:
	if (res_dst_orig_node)
		batadv_orig_node_put(res_dst_orig_node);
	if (req_dst_orig_node)
		batadv_orig_node_put(req_dst_orig_node);
	kfree(tvlv_tt_data);
	return ret;
}

/**
 * batadv_send_my_tt_response - send reply to tt request concerning this node's
 *  translation table
 * @bat_priv: the bat priv with all the soft interface information
 * @tt_data: tt data containing the tt request information
 * @req_src: mac address of tt request sender
 *
 * Return: true if tt request reply was sent, false otherwise.
 */
static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
				       struct batadv_tvlv_tt_data *tt_data,
				       u8 *req_src)
{
	struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
	struct batadv_hard_iface *primary_if = NULL;
	struct batadv_tvlv_tt_change *tt_change;
	struct batadv_orig_node *orig_node;
	u8 my_ttvn, req_ttvn;
	u16 tvlv_len;
	bool full_table;
	s32 tt_len;

	batadv_dbg(BATADV_DBG_TT, bat_priv,
		   "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
		   req_src, tt_data->ttvn,
		   ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));

	spin_lock_bh(&bat_priv->tt.commit_lock);

	my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
	req_ttvn = tt_data->ttvn;

	orig_node = batadv_orig_hash_find(bat_priv, req_src);
	if (!orig_node)
		goto out;

	primary_if = batadv_primary_if_get_selected(bat_priv);
	if (!primary_if)
		goto out;

	/* If the full table has been explicitly requested or the gap
	 * is too big send the whole local translation table
	 */
	if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
	    !bat_priv->tt.last_changeset)
		full_table = true;
	else
		full_table = false;

	/* TT fragmentation hasn't been implemented yet, so send as many
	 * TT entries fit a single packet as possible only
	 */
	if (!full_table) {
		spin_lock_bh(&bat_priv->tt.last_changeset_lock);

		tt_len = bat_priv->tt.last_changeset_len;
		tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
							     &tvlv_tt_data,
							     &tt_change,
							     &tt_len);
		if (!tt_len || !tvlv_len)
			goto unlock;

		/* Copy the last orig_node's OGM buffer */
		memcpy(tt_change, bat_priv->tt.last_changeset,
		       bat_priv->tt.last_changeset_len);
		spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
	} else {
		req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);

		/* allocate the tvlv, put the tt_data and all the tt_vlan_data
		 * in the initial part
		 */
		tt_len = -1;
		tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
							     &tvlv_tt_data,
							     &tt_change,
							     &tt_len);
		if (!tt_len || !tvlv_len)
			goto out;

		/* fill the rest of the tvlv with the real TT entries */
		batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
					tt_change, tt_len,
					batadv_tt_local_valid, NULL);
	}

	tvlv_tt_data->flags = BATADV_TT_RESPONSE;
	tvlv_tt_data->ttvn = req_ttvn;

	if (full_table)
		tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;

	batadv_dbg(BATADV_DBG_TT, bat_priv,
		   "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
		   orig_node->orig, full_table ? 'F' : '.', req_ttvn);

	batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);

	batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
				 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
				 tvlv_len);

	goto out;

unlock:
	spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
out:
	spin_unlock_bh(&bat_priv->tt.commit_lock);
	if (orig_node)
		batadv_orig_node_put(orig_node);
	if (primary_if)
		batadv_hardif_put(primary_if);
	kfree(tvlv_tt_data);
	/* The packet was for this host, so it doesn't need to be re-routed */
	return true;
}

/**
 * batadv_send_tt_response - send reply to tt request
 * @bat_priv: the bat priv with all the soft interface information
 * @tt_data: tt data containing the tt request information
 * @req_src: mac address of tt request sender
 * @req_dst: mac address of tt request recipient
 *
 * Return: true if tt request reply was sent, false otherwise.
 */
static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
				    struct batadv_tvlv_tt_data *tt_data,
				    u8 *req_src, u8 *req_dst)
{
	if (batadv_is_my_mac(bat_priv, req_dst))
		return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
	return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
					     req_dst);
}

static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
				      struct batadv_orig_node *orig_node,
				      struct batadv_tvlv_tt_change *tt_change,
				      u16 tt_num_changes, u8 ttvn)
{
	int i;
	int roams;

	for (i = 0; i < tt_num_changes; i++) {
		if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
			roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
			batadv_tt_global_del(bat_priv, orig_node,
					     (tt_change + i)->addr,
					     ntohs((tt_change + i)->vid),
					     "tt removed by changes",
					     roams);
		} else {
			if (!batadv_tt_global_add(bat_priv, orig_node,
						  (tt_change + i)->addr,
						  ntohs((tt_change + i)->vid),
						  (tt_change + i)->flags, ttvn))
				/* In case of problem while storing a
				 * global_entry, we stop the updating
				 * procedure without committing the
				 * ttvn change. This will avoid to send
				 * corrupted data on tt_request
				 */
				return;
		}
	}
	set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
}

static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
				  struct batadv_tvlv_tt_change *tt_change,
				  u8 ttvn, u8 *resp_src,
				  u16 num_entries)
{
	struct batadv_orig_node *orig_node;

	orig_node = batadv_orig_hash_find(bat_priv, resp_src);
	if (!orig_node)
		goto out;

	/* Purge the old table first.. */
	batadv_tt_global_del_orig(bat_priv, orig_node, -1,
				  "Received full table");

	_batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
				  ttvn);

	spin_lock_bh(&orig_node->tt_buff_lock);
	kfree(orig_node->tt_buff);
	orig_node->tt_buff_len = 0;
	orig_node->tt_buff = NULL;
	spin_unlock_bh(&orig_node->tt_buff_lock);

	atomic_set(&orig_node->last_ttvn, ttvn);

out:
	if (orig_node)
		batadv_orig_node_put(orig_node);
}

static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
				     struct batadv_orig_node *orig_node,
				     u16 tt_num_changes, u8 ttvn,
				     struct batadv_tvlv_tt_change *tt_change)
{
	_batadv_tt_update_changes(bat_priv, orig_node, tt_change,
				  tt_num_changes, ttvn);

	batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
				   batadv_tt_len(tt_num_changes));
	atomic_set(&orig_node->last_ttvn, ttvn);
}

/**
 * batadv_is_my_client - check if a client is served by the local node
 * @bat_priv: the bat priv with all the soft interface information
 * @addr: the mac address of the client to check
 * @vid: VLAN identifier
 *
 * Return: true if the client is served by this node, false otherwise.
 */
bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
			 unsigned short vid)
{
	struct batadv_tt_local_entry *tt_local_entry;
	bool ret = false;

	tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
	if (!tt_local_entry)
		goto out;
	/* Check if the client has been logically deleted (but is kept for
	 * consistency purpose)
	 */
	if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
	    (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
		goto out;
	ret = true;
out:
	if (tt_local_entry)
		batadv_tt_local_entry_put(tt_local_entry);
	return ret;
}

/**
 * batadv_handle_tt_response - process incoming tt reply
 * @bat_priv: the bat priv with all the soft interface information
 * @tt_data: tt data containing the tt request information
 * @resp_src: mac address of tt reply sender
 * @num_entries: number of tt change entries appended to the tt data
 */
static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
				      struct batadv_tvlv_tt_data *tt_data,
				      u8 *resp_src, u16 num_entries)
{
	struct batadv_tt_req_node *node;
	struct hlist_node *safe;
	struct batadv_orig_node *orig_node = NULL;
	struct batadv_tvlv_tt_change *tt_change;
	u8 *tvlv_ptr = (u8 *)tt_data;
	u16 change_offset;

	batadv_dbg(BATADV_DBG_TT, bat_priv,
		   "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
		   resp_src, tt_data->ttvn, num_entries,
		   ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));

	orig_node = batadv_orig_hash_find(bat_priv, resp_src);
	if (!orig_node)
		goto out;

	spin_lock_bh(&orig_node->tt_lock);

	change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
	change_offset *= ntohs(tt_data->num_vlan);
	change_offset += sizeof(*tt_data);
	tvlv_ptr += change_offset;

	tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
	if (tt_data->flags & BATADV_TT_FULL_TABLE) {
		batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
				      resp_src, num_entries);
	} else {
		batadv_tt_update_changes(bat_priv, orig_node, num_entries,
					 tt_data->ttvn, tt_change);
	}

	/* Recalculate the CRC for this orig_node and store it */
	batadv_tt_global_update_crc(bat_priv, orig_node);

	spin_unlock_bh(&orig_node->tt_lock);

	/* Delete the tt_req_node from pending tt_requests list */
	spin_lock_bh(&bat_priv->tt.req_list_lock);
	hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
		if (!batadv_compare_eth(node->addr, resp_src))
			continue;
		hlist_del_init(&node->list);
		batadv_tt_req_node_put(node);
	}

	spin_unlock_bh(&bat_priv->tt.req_list_lock);
out:
	if (orig_node)
		batadv_orig_node_put(orig_node);
}

static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
{
	struct batadv_tt_roam_node *node, *safe;

	spin_lock_bh(&bat_priv->tt.roam_list_lock);

	list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
		list_del(&node->list);
		kmem_cache_free(batadv_tt_roam_cache, node);
	}

	spin_unlock_bh(&bat_priv->tt.roam_list_lock);
}

static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
{
	struct batadv_tt_roam_node *node, *safe;

	spin_lock_bh(&bat_priv->tt.roam_list_lock);
	list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
		if (!batadv_has_timed_out(node->first_time,
					  BATADV_ROAMING_MAX_TIME))
			continue;

		list_del(&node->list);
		kmem_cache_free(batadv_tt_roam_cache, node);
	}
	spin_unlock_bh(&bat_priv->tt.roam_list_lock);
}

/**
 * batadv_tt_check_roam_count - check if a client has roamed too frequently
 * @bat_priv: the bat priv with all the soft interface information
 * @client: mac address of the roaming client
 *
 * This function checks whether the client already reached the
 * maximum number of possible roaming phases. In this case the ROAMING_ADV
 * will not be sent.
 *
 * Return: true if the ROAMING_ADV can be sent, false otherwise
 */
static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
{
	struct batadv_tt_roam_node *tt_roam_node;
	bool ret = false;

	spin_lock_bh(&bat_priv->tt.roam_list_lock);
	/* The new tt_req will be issued only if I'm not waiting for a
	 * reply from the same orig_node yet
	 */
	list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
		if (!batadv_compare_eth(tt_roam_node->addr, client))
			continue;

		if (batadv_has_timed_out(tt_roam_node->first_time,
					 BATADV_ROAMING_MAX_TIME))
			continue;

		if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
			/* Sorry, you roamed too many times! */
			goto unlock;
		ret = true;
		break;
	}

	if (!ret) {
		tt_roam_node = kmem_cache_alloc(batadv_tt_roam_cache,
						GFP_ATOMIC);
		if (!tt_roam_node)
			goto unlock;

		tt_roam_node->first_time = jiffies;
		atomic_set(&tt_roam_node->counter,
			   BATADV_ROAMING_MAX_COUNT - 1);
		ether_addr_copy(tt_roam_node->addr, client);

		list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
		ret = true;
	}

unlock:
	spin_unlock_bh(&bat_priv->tt.roam_list_lock);
	return ret;
}

/**
 * batadv_send_roam_adv - send a roaming advertisement message
 * @bat_priv: the bat priv with all the soft interface information
 * @client: mac address of the roaming client
 * @vid: VLAN identifier
 * @orig_node: message destination
 *
 * Send a ROAMING_ADV message to the node which was previously serving this
 * client. This is done to inform the node that from now on all traffic destined
 * for this particular roamed client has to be forwarded to the sender of the
 * roaming message.
 */
static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
				 unsigned short vid,
				 struct batadv_orig_node *orig_node)
{
	struct batadv_hard_iface *primary_if;
	struct batadv_tvlv_roam_adv tvlv_roam;

	primary_if = batadv_primary_if_get_selected(bat_priv);
	if (!primary_if)
		goto out;

	/* before going on we have to check whether the client has
	 * already roamed to us too many times
	 */
	if (!batadv_tt_check_roam_count(bat_priv, client))
		goto out;

	batadv_dbg(BATADV_DBG_TT, bat_priv,
		   "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
		   orig_node->orig, client, BATADV_PRINT_VID(vid));

	batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);

	memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
	tvlv_roam.vid = htons(vid);

	batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
				 orig_node->orig, BATADV_TVLV_ROAM, 1,
				 &tvlv_roam, sizeof(tvlv_roam));

out:
	if (primary_if)
		batadv_hardif_put(primary_if);
}

static void batadv_tt_purge(struct work_struct *work)
{
	struct delayed_work *delayed_work;
	struct batadv_priv_tt *priv_tt;
	struct batadv_priv *bat_priv;

	delayed_work = to_delayed_work(work);
	priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
	bat_priv = container_of(priv_tt, struct batadv_priv, tt);

	batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
	batadv_tt_global_purge(bat_priv);
	batadv_tt_req_purge(bat_priv);
	batadv_tt_roam_purge(bat_priv);

	queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
			   msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
}

void batadv_tt_free(struct batadv_priv *bat_priv)
{
	batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
	batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);

	cancel_delayed_work_sync(&bat_priv->tt.work);

	batadv_tt_local_table_free(bat_priv);
	batadv_tt_global_table_free(bat_priv);
	batadv_tt_req_list_free(bat_priv);
	batadv_tt_changes_list_free(bat_priv);
	batadv_tt_roam_list_free(bat_priv);

	kfree(bat_priv->tt.last_changeset);
}

/**
 * batadv_tt_local_set_flags - set or unset the specified flags on the local
 *  table and possibly count them in the TT size
 * @bat_priv: the bat priv with all the soft interface information
 * @flags: the flag to switch
 * @enable: whether to set or unset the flag
 * @count: whether to increase the TT size by the number of changed entries
 */
static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
				      bool enable, bool count)
{
	struct batadv_hashtable *hash = bat_priv->tt.local_hash;
	struct batadv_tt_common_entry *tt_common_entry;
	u16 changed_num = 0;
	struct hlist_head *head;
	u32 i;

	if (!hash)
		return;

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];

		rcu_read_lock();
		hlist_for_each_entry_rcu(tt_common_entry,
					 head, hash_entry) {
			if (enable) {
				if ((tt_common_entry->flags & flags) == flags)
					continue;
				tt_common_entry->flags |= flags;
			} else {
				if (!(tt_common_entry->flags & flags))
					continue;
				tt_common_entry->flags &= ~flags;
			}
			changed_num++;

			if (!count)
				continue;

			batadv_tt_local_size_inc(bat_priv,
						 tt_common_entry->vid);
		}
		rcu_read_unlock();
	}
}

/* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
{
	struct batadv_hashtable *hash = bat_priv->tt.local_hash;
	struct batadv_tt_common_entry *tt_common;
	struct batadv_tt_local_entry *tt_local;
	struct hlist_node *node_tmp;
	struct hlist_head *head;
	spinlock_t *list_lock; /* protects write access to the hash lists */
	u32 i;

	if (!hash)
		return;

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];
		list_lock = &hash->list_locks[i];

		spin_lock_bh(list_lock);
		hlist_for_each_entry_safe(tt_common, node_tmp, head,
					  hash_entry) {
			if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
				continue;

			batadv_dbg(BATADV_DBG_TT, bat_priv,
				   "Deleting local tt entry (%pM, vid: %d): pending\n",
				   tt_common->addr,
				   BATADV_PRINT_VID(tt_common->vid));

			batadv_tt_local_size_dec(bat_priv, tt_common->vid);
			hlist_del_rcu(&tt_common->hash_entry);
			tt_local = container_of(tt_common,
						struct batadv_tt_local_entry,
						common);

			batadv_tt_local_entry_put(tt_local);
		}
		spin_unlock_bh(list_lock);
	}
}

/**
 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
 *  which have been queued in the time since the last commit
 * @bat_priv: the bat priv with all the soft interface information
 *
 * Caller must hold tt->commit_lock.
 */
static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
{
	lockdep_assert_held(&bat_priv->tt.commit_lock);

	/* Update multicast addresses in local translation table */
	batadv_mcast_mla_update(bat_priv);

	if (atomic_read(&bat_priv->tt.local_changes) < 1) {
		if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
			batadv_tt_tvlv_container_update(bat_priv);
		return;
	}

	batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);

	batadv_tt_local_purge_pending_clients(bat_priv);
	batadv_tt_local_update_crc(bat_priv);

	/* Increment the TTVN only once per OGM interval */
	atomic_inc(&bat_priv->tt.vn);
	batadv_dbg(BATADV_DBG_TT, bat_priv,
		   "Local changes committed, updating to ttvn %u\n",
		   (u8)atomic_read(&bat_priv->tt.vn));

	/* reset the sending counter */
	atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
	batadv_tt_tvlv_container_update(bat_priv);
}

/**
 * batadv_tt_local_commit_changes - commit all pending local tt changes which
 *  have been queued in the time since the last commit
 * @bat_priv: the bat priv with all the soft interface information
 */
void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
{
	spin_lock_bh(&bat_priv->tt.commit_lock);
	batadv_tt_local_commit_changes_nolock(bat_priv);
	spin_unlock_bh(&bat_priv->tt.commit_lock);
}

bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
			   unsigned short vid)
{
	struct batadv_tt_local_entry *tt_local_entry = NULL;
	struct batadv_tt_global_entry *tt_global_entry = NULL;
	struct batadv_softif_vlan *vlan;
	bool ret = false;

	vlan = batadv_softif_vlan_get(bat_priv, vid);
	if (!vlan)
		return false;

	if (!atomic_read(&vlan->ap_isolation))
		goto out;

	tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
	if (!tt_local_entry)
		goto out;

	tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
	if (!tt_global_entry)
		goto out;

	if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
		goto out;

	ret = true;

out:
	batadv_softif_vlan_put(vlan);
	if (tt_global_entry)
		batadv_tt_global_entry_put(tt_global_entry);
	if (tt_local_entry)
		batadv_tt_local_entry_put(tt_local_entry);
	return ret;
}

/**
 * batadv_tt_update_orig - update global translation table with new tt
 *  information received via ogms
 * @bat_priv: the bat priv with all the soft interface information
 * @orig_node: the orig_node of the ogm
 * @tt_buff: pointer to the first tvlv VLAN entry
 * @tt_num_vlan: number of tvlv VLAN entries
 * @tt_change: pointer to the first entry in the TT buffer
 * @tt_num_changes: number of tt changes inside the tt buffer
 * @ttvn: translation table version number of this changeset
 */
static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
				  struct batadv_orig_node *orig_node,
				  const void *tt_buff, u16 tt_num_vlan,
				  struct batadv_tvlv_tt_change *tt_change,
				  u16 tt_num_changes, u8 ttvn)
{
	u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
	struct batadv_tvlv_tt_vlan_data *tt_vlan;
	bool full_table = true;
	bool has_tt_init;

	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
	has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
			       &orig_node->capa_initialized);

	/* orig table not initialised AND first diff is in the OGM OR the ttvn
	 * increased by one -> we can apply the attached changes
	 */
	if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
		/* the OGM could not contain the changes due to their size or
		 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
		 * times.
		 * In this case send a tt request
		 */
		if (!tt_num_changes) {
			full_table = false;
			goto request_table;
		}

		spin_lock_bh(&orig_node->tt_lock);

		batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
					 ttvn, tt_change);

		/* Even if we received the precomputed crc with the OGM, we
		 * prefer to recompute it to spot any possible inconsistency
		 * in the global table
		 */
		batadv_tt_global_update_crc(bat_priv, orig_node);

		spin_unlock_bh(&orig_node->tt_lock);

		/* The ttvn alone is not enough to guarantee consistency
		 * because a single value could represent different states
		 * (due to the wrap around). Thus a node has to check whether
		 * the resulting table (after applying the changes) is still
		 * consistent or not. E.g. a node could disconnect while its
		 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
		 * checking the CRC value is mandatory to detect the
		 * inconsistency
		 */
		if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
						tt_num_vlan))
			goto request_table;
	} else {
		/* if we missed more than one change or our tables are not
		 * in sync anymore -> request fresh tt data
		 */
		if (!has_tt_init || ttvn != orig_ttvn ||
		    !batadv_tt_global_check_crc(orig_node, tt_vlan,
						tt_num_vlan)) {
request_table:
			batadv_dbg(BATADV_DBG_TT, bat_priv,
				   "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
				   orig_node->orig, ttvn, orig_ttvn,
				   tt_num_changes);
			batadv_send_tt_request(bat_priv, orig_node, ttvn,
					       tt_vlan, tt_num_vlan,
					       full_table);
			return;
		}
	}
}

/**
 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
 * @bat_priv: the bat priv with all the soft interface information
 * @addr: the mac address of the client to check
 * @vid: VLAN identifier
 *
 * Return: true if we know that the client has moved from its old originator
 * to another one. This entry is still kept for consistency purposes and will be
 * deleted later by a DEL or because of timeout
 */
bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
					u8 *addr, unsigned short vid)
{
	struct batadv_tt_global_entry *tt_global_entry;
	bool ret = false;

	tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
	if (!tt_global_entry)
		goto out;

	ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
	batadv_tt_global_entry_put(tt_global_entry);
out:
	return ret;
}

/**
 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
 * @bat_priv: the bat priv with all the soft interface information
 * @addr: the mac address of the local client to query
 * @vid: VLAN identifier
 *
 * Return: true if the local client is known to be roaming (it is not served by
 * this node anymore) or not. If yes, the client is still present in the table
 * to keep the latter consistent with the node TTVN
 */
bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
				       u8 *addr, unsigned short vid)
{
	struct batadv_tt_local_entry *tt_local_entry;
	bool ret = false;

	tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
	if (!tt_local_entry)
		goto out;

	ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
	batadv_tt_local_entry_put(tt_local_entry);
out:
	return ret;
}

bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
					  struct batadv_orig_node *orig_node,
					  const unsigned char *addr,
					  unsigned short vid)
{
	bool ret = false;

	if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
				  BATADV_TT_CLIENT_TEMP,
				  atomic_read(&orig_node->last_ttvn)))
		goto out;

	batadv_dbg(BATADV_DBG_TT, bat_priv,
		   "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
		   addr, BATADV_PRINT_VID(vid), orig_node->orig);
	ret = true;
out:
	return ret;
}

/**
 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
 *  maximum packet size that can be transported through the mesh
 * @soft_iface: netdev struct of the mesh interface
 *
 * Remove entries older than 'timeout' and half timeout if more entries need
 * to be removed.
 */
void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
{
	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
	int packet_size_max = atomic_read(&bat_priv->packet_size_max);
	int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
	bool reduced = false;

	spin_lock_bh(&bat_priv->tt.commit_lock);

	while (true) {
		table_size = batadv_tt_local_table_transmit_size(bat_priv);
		if (packet_size_max >= table_size)
			break;

		batadv_tt_local_purge(bat_priv, timeout);
		batadv_tt_local_purge_pending_clients(bat_priv);

		timeout /= 2;
		reduced = true;
		net_ratelimited_function(batadv_info, soft_iface,
					 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
					 packet_size_max);
	}

	/* commit these changes immediately, to avoid synchronization problem
	 * with the TTVN
	 */
	if (reduced)
		batadv_tt_local_commit_changes_nolock(bat_priv);

	spin_unlock_bh(&bat_priv->tt.commit_lock);
}

/**
 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
 * @bat_priv: the bat priv with all the soft interface information
 * @orig: the orig_node of the ogm
 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
 * @tvlv_value: tvlv buffer containing the gateway data
 * @tvlv_value_len: tvlv buffer length
 */
static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
					  struct batadv_orig_node *orig,
					  u8 flags, void *tvlv_value,
					  u16 tvlv_value_len)
{
	struct batadv_tvlv_tt_vlan_data *tt_vlan;
	struct batadv_tvlv_tt_change *tt_change;
	struct batadv_tvlv_tt_data *tt_data;
	u16 num_entries, num_vlan;

	if (tvlv_value_len < sizeof(*tt_data))
		return;

	tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
	tvlv_value_len -= sizeof(*tt_data);

	num_vlan = ntohs(tt_data->num_vlan);

	if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
		return;

	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
	tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
	tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;

	num_entries = batadv_tt_entries(tvlv_value_len);

	batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
			      num_entries, tt_data->ttvn);
}

/**
 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
 *  container
 * @bat_priv: the bat priv with all the soft interface information
 * @src: mac address of tt tvlv sender
 * @dst: mac address of tt tvlv recipient
 * @tvlv_value: tvlv buffer containing the tt data
 * @tvlv_value_len: tvlv buffer length
 *
 * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
 * otherwise.
 */
static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
					     u8 *src, u8 *dst,
					     void *tvlv_value,
					     u16 tvlv_value_len)
{
	struct batadv_tvlv_tt_data *tt_data;
	u16 tt_vlan_len, tt_num_entries;
	char tt_flag;
	bool ret;

	if (tvlv_value_len < sizeof(*tt_data))
		return NET_RX_SUCCESS;

	tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
	tvlv_value_len -= sizeof(*tt_data);

	tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
	tt_vlan_len *= ntohs(tt_data->num_vlan);

	if (tvlv_value_len < tt_vlan_len)
		return NET_RX_SUCCESS;

	tvlv_value_len -= tt_vlan_len;
	tt_num_entries = batadv_tt_entries(tvlv_value_len);

	switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
	case BATADV_TT_REQUEST:
		batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);

		/* If this node cannot provide a TT response the tt_request is
		 * forwarded
		 */
		ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
		if (!ret) {
			if (tt_data->flags & BATADV_TT_FULL_TABLE)
				tt_flag = 'F';
			else
				tt_flag = '.';

			batadv_dbg(BATADV_DBG_TT, bat_priv,
				   "Routing TT_REQUEST to %pM [%c]\n",
				   dst, tt_flag);
			/* tvlv API will re-route the packet */
			return NET_RX_DROP;
		}
		break;
	case BATADV_TT_RESPONSE:
		batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);

		if (batadv_is_my_mac(bat_priv, dst)) {
			batadv_handle_tt_response(bat_priv, tt_data,
						  src, tt_num_entries);
			return NET_RX_SUCCESS;
		}

		if (tt_data->flags & BATADV_TT_FULL_TABLE)
			tt_flag =  'F';
		else
			tt_flag = '.';

		batadv_dbg(BATADV_DBG_TT, bat_priv,
			   "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);

		/* tvlv API will re-route the packet */
		return NET_RX_DROP;
	}

	return NET_RX_SUCCESS;
}

/**
 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
 * @bat_priv: the bat priv with all the soft interface information
 * @src: mac address of tt tvlv sender
 * @dst: mac address of tt tvlv recipient
 * @tvlv_value: tvlv buffer containing the tt data
 * @tvlv_value_len: tvlv buffer length
 *
 * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
 * otherwise.
 */
static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
					       u8 *src, u8 *dst,
					       void *tvlv_value,
					       u16 tvlv_value_len)
{
	struct batadv_tvlv_roam_adv *roaming_adv;
	struct batadv_orig_node *orig_node = NULL;

	/* If this node is not the intended recipient of the
	 * roaming advertisement the packet is forwarded
	 * (the tvlv API will re-route the packet).
	 */
	if (!batadv_is_my_mac(bat_priv, dst))
		return NET_RX_DROP;

	if (tvlv_value_len < sizeof(*roaming_adv))
		goto out;

	orig_node = batadv_orig_hash_find(bat_priv, src);
	if (!orig_node)
		goto out;

	batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
	roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;

	batadv_dbg(BATADV_DBG_TT, bat_priv,
		   "Received ROAMING_ADV from %pM (client %pM)\n",
		   src, roaming_adv->client);

	batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
			     ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
			     atomic_read(&orig_node->last_ttvn) + 1);

out:
	if (orig_node)
		batadv_orig_node_put(orig_node);
	return NET_RX_SUCCESS;
}

/**
 * batadv_tt_init - initialise the translation table internals
 * @bat_priv: the bat priv with all the soft interface information
 *
 * Return: 0 on success or negative error number in case of failure.
 */
int batadv_tt_init(struct batadv_priv *bat_priv)
{
	int ret;

	/* synchronized flags must be remote */
	BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));

	ret = batadv_tt_local_init(bat_priv);
	if (ret < 0)
		return ret;

	ret = batadv_tt_global_init(bat_priv);
	if (ret < 0)
		return ret;

	batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
				     batadv_tt_tvlv_unicast_handler_v1,
				     BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);

	batadv_tvlv_handler_register(bat_priv, NULL,
				     batadv_roam_tvlv_unicast_handler_v1,
				     BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);

	INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
	queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
			   msecs_to_jiffies(BATADV_TT_WORK_PERIOD));

	return 1;
}

/**
 * batadv_tt_global_is_isolated - check if a client is marked as isolated
 * @bat_priv: the bat priv with all the soft interface information
 * @addr: the mac address of the client
 * @vid: the identifier of the VLAN where this client is connected
 *
 * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
 * otherwise
 */
bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
				  const u8 *addr, unsigned short vid)
{
	struct batadv_tt_global_entry *tt;
	bool ret;

	tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
	if (!tt)
		return false;

	ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;

	batadv_tt_global_entry_put(tt);

	return ret;
}

/**
 * batadv_tt_cache_init - Initialize tt memory object cache
 *
 * Return: 0 on success or negative error number in case of failure.
 */
int __init batadv_tt_cache_init(void)
{
	size_t tl_size = sizeof(struct batadv_tt_local_entry);
	size_t tg_size = sizeof(struct batadv_tt_global_entry);
	size_t tt_orig_size = sizeof(struct batadv_tt_orig_list_entry);
	size_t tt_change_size = sizeof(struct batadv_tt_change_node);
	size_t tt_req_size = sizeof(struct batadv_tt_req_node);
	size_t tt_roam_size = sizeof(struct batadv_tt_roam_node);

	batadv_tl_cache = kmem_cache_create("batadv_tl_cache", tl_size, 0,
					    SLAB_HWCACHE_ALIGN, NULL);
	if (!batadv_tl_cache)
		return -ENOMEM;

	batadv_tg_cache = kmem_cache_create("batadv_tg_cache", tg_size, 0,
					    SLAB_HWCACHE_ALIGN, NULL);
	if (!batadv_tg_cache)
		goto err_tt_tl_destroy;

	batadv_tt_orig_cache = kmem_cache_create("batadv_tt_orig_cache",
						 tt_orig_size, 0,
						 SLAB_HWCACHE_ALIGN, NULL);
	if (!batadv_tt_orig_cache)
		goto err_tt_tg_destroy;

	batadv_tt_change_cache = kmem_cache_create("batadv_tt_change_cache",
						   tt_change_size, 0,
						   SLAB_HWCACHE_ALIGN, NULL);
	if (!batadv_tt_change_cache)
		goto err_tt_orig_destroy;

	batadv_tt_req_cache = kmem_cache_create("batadv_tt_req_cache",
						tt_req_size, 0,
						SLAB_HWCACHE_ALIGN, NULL);
	if (!batadv_tt_req_cache)
		goto err_tt_change_destroy;

	batadv_tt_roam_cache = kmem_cache_create("batadv_tt_roam_cache",
						 tt_roam_size, 0,
						 SLAB_HWCACHE_ALIGN, NULL);
	if (!batadv_tt_roam_cache)
		goto err_tt_req_destroy;

	return 0;

err_tt_req_destroy:
	kmem_cache_destroy(batadv_tt_req_cache);
	batadv_tt_req_cache = NULL;
err_tt_change_destroy:
	kmem_cache_destroy(batadv_tt_change_cache);
	batadv_tt_change_cache = NULL;
err_tt_orig_destroy:
	kmem_cache_destroy(batadv_tt_orig_cache);
	batadv_tt_orig_cache = NULL;
err_tt_tg_destroy:
	kmem_cache_destroy(batadv_tg_cache);
	batadv_tg_cache = NULL;
err_tt_tl_destroy:
	kmem_cache_destroy(batadv_tl_cache);
	batadv_tl_cache = NULL;

	return -ENOMEM;
}

/**
 * batadv_tt_cache_destroy - Destroy tt memory object cache
 */
void batadv_tt_cache_destroy(void)
{
	kmem_cache_destroy(batadv_tl_cache);
	kmem_cache_destroy(batadv_tg_cache);
	kmem_cache_destroy(batadv_tt_orig_cache);
	kmem_cache_destroy(batadv_tt_change_cache);
	kmem_cache_destroy(batadv_tt_req_cache);
	kmem_cache_destroy(batadv_tt_roam_cache);
}