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Commit 10003453479ef287a73f8a39593f8f42687ea565

Authored by David Howells
Committed by David S. Miller
1 parent 0197b087ed

AF_RXRPC: Handle receiving ACKALL packets 

The OpenAFS server is now sending ACKALL packets, so we need to handle them.
Otherwise we report a protocol error and abort.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Showing 1 changed file with 1 additions and 0 deletions Inline Diff

net/rxrpc/ar-input.c
Diff comments   View file @ 1000345
1 /* RxRPC packet reception 1 /* RxRPC packet reception
2 * 2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com) 4 * Written by David Howells (dhowells@redhat.com)
5 * 5 *
6 * This program is free software; you can redistribute it and/or 6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License 7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version. 9 * 2 of the License, or (at your option) any later version.
10 */ 10 */
11 11
12 #include <linux/module.h> 12 #include <linux/module.h>
13 #include <linux/net.h> 13 #include <linux/net.h>
14 #include <linux/skbuff.h> 14 #include <linux/skbuff.h>
15 #include <linux/errqueue.h> 15 #include <linux/errqueue.h>
16 #include <linux/udp.h> 16 #include <linux/udp.h>
17 #include <linux/in.h> 17 #include <linux/in.h>
18 #include <linux/in6.h> 18 #include <linux/in6.h>
19 #include <linux/icmp.h> 19 #include <linux/icmp.h>
20 #include <linux/gfp.h> 20 #include <linux/gfp.h>
21 #include <net/sock.h> 21 #include <net/sock.h>
22 #include <net/af_rxrpc.h> 22 #include <net/af_rxrpc.h>
23 #include <net/ip.h> 23 #include <net/ip.h>
24 #include <net/udp.h> 24 #include <net/udp.h>
25 #include <net/net_namespace.h> 25 #include <net/net_namespace.h>
26 #include "ar-internal.h" 26 #include "ar-internal.h"
27 27
28 unsigned long rxrpc_ack_timeout = 1; 28 unsigned long rxrpc_ack_timeout = 1;
29 29
30 const char *rxrpc_pkts[] = { 30 const char *rxrpc_pkts[] = {
31 "?00", 31 "?00",
32 "DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG", 32 "DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG",
33 "?09", "?10", "?11", "?12", "?13", "?14", "?15" 33 "?09", "?10", "?11", "?12", "?13", "?14", "?15"
34 }; 34 };
35 35
36 /* 36 /*
37 * queue a packet for recvmsg to pass to userspace 37 * queue a packet for recvmsg to pass to userspace
38 * - the caller must hold a lock on call->lock 38 * - the caller must hold a lock on call->lock
39 * - must not be called with interrupts disabled (sk_filter() disables BH's) 39 * - must not be called with interrupts disabled (sk_filter() disables BH's)
40 * - eats the packet whether successful or not 40 * - eats the packet whether successful or not
41 * - there must be just one reference to the packet, which the caller passes to 41 * - there must be just one reference to the packet, which the caller passes to
42 * this function 42 * this function
43 */ 43 */
44 int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb, 44 int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb,
45 bool force, bool terminal) 45 bool force, bool terminal)
46 { 46 {
47 struct rxrpc_skb_priv *sp; 47 struct rxrpc_skb_priv *sp;
48 struct rxrpc_sock *rx = call->socket; 48 struct rxrpc_sock *rx = call->socket;
49 struct sock *sk; 49 struct sock *sk;
50 int skb_len, ret; 50 int skb_len, ret;
51 51
52 _enter(",,%d,%d", force, terminal); 52 _enter(",,%d,%d", force, terminal);
53 53
54 ASSERT(!irqs_disabled()); 54 ASSERT(!irqs_disabled());
55 55
56 sp = rxrpc_skb(skb); 56 sp = rxrpc_skb(skb);
57 ASSERTCMP(sp->call, ==, call); 57 ASSERTCMP(sp->call, ==, call);
58 58
59 /* if we've already posted the terminal message for a call, then we 59 /* if we've already posted the terminal message for a call, then we
60 * don't post any more */ 60 * don't post any more */
61 if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { 61 if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) {
62 _debug("already terminated"); 62 _debug("already terminated");
63 ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE); 63 ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE);
64 skb->destructor = NULL; 64 skb->destructor = NULL;
65 sp->call = NULL; 65 sp->call = NULL;
66 rxrpc_put_call(call); 66 rxrpc_put_call(call);
67 rxrpc_free_skb(skb); 67 rxrpc_free_skb(skb);
68 return 0; 68 return 0;
69 } 69 }
70 70
71 sk = &rx->sk; 71 sk = &rx->sk;
72 72
73 if (!force) { 73 if (!force) {
74 /* cast skb->rcvbuf to unsigned... It's pointless, but 74 /* cast skb->rcvbuf to unsigned... It's pointless, but
75 * reduces number of warnings when compiling with -W 75 * reduces number of warnings when compiling with -W
76 * --ANK */ 76 * --ANK */
77 // ret = -ENOBUFS; 77 // ret = -ENOBUFS;
78 // if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 78 // if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
79 // (unsigned) sk->sk_rcvbuf) 79 // (unsigned) sk->sk_rcvbuf)
80 // goto out; 80 // goto out;
81 81
82 ret = sk_filter(sk, skb); 82 ret = sk_filter(sk, skb);
83 if (ret < 0) 83 if (ret < 0)
84 goto out; 84 goto out;
85 } 85 }
86 86
87 spin_lock_bh(&sk->sk_receive_queue.lock); 87 spin_lock_bh(&sk->sk_receive_queue.lock);
88 if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) && 88 if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) &&
89 !test_bit(RXRPC_CALL_RELEASED, &call->flags) && 89 !test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
90 call->socket->sk.sk_state != RXRPC_CLOSE) { 90 call->socket->sk.sk_state != RXRPC_CLOSE) {
91 skb->destructor = rxrpc_packet_destructor; 91 skb->destructor = rxrpc_packet_destructor;
92 skb->dev = NULL; 92 skb->dev = NULL;
93 skb->sk = sk; 93 skb->sk = sk;
94 atomic_add(skb->truesize, &sk->sk_rmem_alloc); 94 atomic_add(skb->truesize, &sk->sk_rmem_alloc);
95 95
96 if (terminal) { 96 if (terminal) {
97 _debug("<<<< TERMINAL MESSAGE >>>>"); 97 _debug("<<<< TERMINAL MESSAGE >>>>");
98 set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags); 98 set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags);
99 } 99 }
100 100
101 /* allow interception by a kernel service */ 101 /* allow interception by a kernel service */
102 if (rx->interceptor) { 102 if (rx->interceptor) {
103 rx->interceptor(sk, call->user_call_ID, skb); 103 rx->interceptor(sk, call->user_call_ID, skb);
104 spin_unlock_bh(&sk->sk_receive_queue.lock); 104 spin_unlock_bh(&sk->sk_receive_queue.lock);
105 } else { 105 } else {
106 106
107 /* Cache the SKB length before we tack it onto the 107 /* Cache the SKB length before we tack it onto the
108 * receive queue. Once it is added it no longer 108 * receive queue. Once it is added it no longer
109 * belongs to us and may be freed by other threads of 109 * belongs to us and may be freed by other threads of
110 * control pulling packets from the queue */ 110 * control pulling packets from the queue */
111 skb_len = skb->len; 111 skb_len = skb->len;
112 112
113 _net("post skb %p", skb); 113 _net("post skb %p", skb);
114 __skb_queue_tail(&sk->sk_receive_queue, skb); 114 __skb_queue_tail(&sk->sk_receive_queue, skb);
115 spin_unlock_bh(&sk->sk_receive_queue.lock); 115 spin_unlock_bh(&sk->sk_receive_queue.lock);
116 116
117 if (!sock_flag(sk, SOCK_DEAD)) 117 if (!sock_flag(sk, SOCK_DEAD))
118 sk->sk_data_ready(sk, skb_len); 118 sk->sk_data_ready(sk, skb_len);
119 } 119 }
120 skb = NULL; 120 skb = NULL;
121 } else { 121 } else {
122 spin_unlock_bh(&sk->sk_receive_queue.lock); 122 spin_unlock_bh(&sk->sk_receive_queue.lock);
123 } 123 }
124 ret = 0; 124 ret = 0;
125 125
126 out: 126 out:
127 /* release the socket buffer */ 127 /* release the socket buffer */
128 if (skb) { 128 if (skb) {
129 skb->destructor = NULL; 129 skb->destructor = NULL;
130 sp->call = NULL; 130 sp->call = NULL;
131 rxrpc_put_call(call); 131 rxrpc_put_call(call);
132 rxrpc_free_skb(skb); 132 rxrpc_free_skb(skb);
133 } 133 }
134 134
135 _leave(" = %d", ret); 135 _leave(" = %d", ret);
136 return ret; 136 return ret;
137 } 137 }
138 138
139 /* 139 /*
140 * process a DATA packet, posting the packet to the appropriate queue 140 * process a DATA packet, posting the packet to the appropriate queue
141 * - eats the packet if successful 141 * - eats the packet if successful
142 */ 142 */
143 static int rxrpc_fast_process_data(struct rxrpc_call *call, 143 static int rxrpc_fast_process_data(struct rxrpc_call *call,
144 struct sk_buff *skb, u32 seq) 144 struct sk_buff *skb, u32 seq)
145 { 145 {
146 struct rxrpc_skb_priv *sp; 146 struct rxrpc_skb_priv *sp;
147 bool terminal; 147 bool terminal;
148 int ret, ackbit, ack; 148 int ret, ackbit, ack;
149 149
150 _enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq); 150 _enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq);
151 151
152 sp = rxrpc_skb(skb); 152 sp = rxrpc_skb(skb);
153 ASSERTCMP(sp->call, ==, NULL); 153 ASSERTCMP(sp->call, ==, NULL);
154 154
155 spin_lock(&call->lock); 155 spin_lock(&call->lock);
156 156
157 if (call->state > RXRPC_CALL_COMPLETE) 157 if (call->state > RXRPC_CALL_COMPLETE)
158 goto discard; 158 goto discard;
159 159
160 ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post); 160 ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post);
161 ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv); 161 ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv);
162 ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten); 162 ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten);
163 163
164 if (seq < call->rx_data_post) { 164 if (seq < call->rx_data_post) {
165 _debug("dup #%u [-%u]", seq, call->rx_data_post); 165 _debug("dup #%u [-%u]", seq, call->rx_data_post);
166 ack = RXRPC_ACK_DUPLICATE; 166 ack = RXRPC_ACK_DUPLICATE;
167 ret = -ENOBUFS; 167 ret = -ENOBUFS;
168 goto discard_and_ack; 168 goto discard_and_ack;
169 } 169 }
170 170
171 /* we may already have the packet in the out of sequence queue */ 171 /* we may already have the packet in the out of sequence queue */
172 ackbit = seq - (call->rx_data_eaten + 1); 172 ackbit = seq - (call->rx_data_eaten + 1);
173 ASSERTCMP(ackbit, >=, 0); 173 ASSERTCMP(ackbit, >=, 0);
174 if (__test_and_set_bit(ackbit, call->ackr_window)) { 174 if (__test_and_set_bit(ackbit, call->ackr_window)) {
175 _debug("dup oos #%u [%u,%u]", 175 _debug("dup oos #%u [%u,%u]",
176 seq, call->rx_data_eaten, call->rx_data_post); 176 seq, call->rx_data_eaten, call->rx_data_post);
177 ack = RXRPC_ACK_DUPLICATE; 177 ack = RXRPC_ACK_DUPLICATE;
178 goto discard_and_ack; 178 goto discard_and_ack;
179 } 179 }
180 180
181 if (seq >= call->ackr_win_top) { 181 if (seq >= call->ackr_win_top) {
182 _debug("exceed #%u [%u]", seq, call->ackr_win_top); 182 _debug("exceed #%u [%u]", seq, call->ackr_win_top);
183 __clear_bit(ackbit, call->ackr_window); 183 __clear_bit(ackbit, call->ackr_window);
184 ack = RXRPC_ACK_EXCEEDS_WINDOW; 184 ack = RXRPC_ACK_EXCEEDS_WINDOW;
185 goto discard_and_ack; 185 goto discard_and_ack;
186 } 186 }
187 187
188 if (seq == call->rx_data_expect) { 188 if (seq == call->rx_data_expect) {
189 clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags); 189 clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags);
190 call->rx_data_expect++; 190 call->rx_data_expect++;
191 } else if (seq > call->rx_data_expect) { 191 } else if (seq > call->rx_data_expect) {
192 _debug("oos #%u [%u]", seq, call->rx_data_expect); 192 _debug("oos #%u [%u]", seq, call->rx_data_expect);
193 call->rx_data_expect = seq + 1; 193 call->rx_data_expect = seq + 1;
194 if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) { 194 if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) {
195 ack = RXRPC_ACK_OUT_OF_SEQUENCE; 195 ack = RXRPC_ACK_OUT_OF_SEQUENCE;
196 goto enqueue_and_ack; 196 goto enqueue_and_ack;
197 } 197 }
198 goto enqueue_packet; 198 goto enqueue_packet;
199 } 199 }
200 200
201 if (seq != call->rx_data_post) { 201 if (seq != call->rx_data_post) {
202 _debug("ahead #%u [%u]", seq, call->rx_data_post); 202 _debug("ahead #%u [%u]", seq, call->rx_data_post);
203 goto enqueue_packet; 203 goto enqueue_packet;
204 } 204 }
205 205
206 if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags)) 206 if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags))
207 goto protocol_error; 207 goto protocol_error;
208 208
209 /* if the packet need security things doing to it, then it goes down 209 /* if the packet need security things doing to it, then it goes down
210 * the slow path */ 210 * the slow path */
211 if (call->conn->security) 211 if (call->conn->security)
212 goto enqueue_packet; 212 goto enqueue_packet;
213 213
214 sp->call = call; 214 sp->call = call;
215 rxrpc_get_call(call); 215 rxrpc_get_call(call);
216 terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && 216 terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) &&
217 !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); 217 !(sp->hdr.flags & RXRPC_CLIENT_INITIATED));
218 ret = rxrpc_queue_rcv_skb(call, skb, false, terminal); 218 ret = rxrpc_queue_rcv_skb(call, skb, false, terminal);
219 if (ret < 0) { 219 if (ret < 0) {
220 if (ret == -ENOMEM || ret == -ENOBUFS) { 220 if (ret == -ENOMEM || ret == -ENOBUFS) {
221 __clear_bit(ackbit, call->ackr_window); 221 __clear_bit(ackbit, call->ackr_window);
222 ack = RXRPC_ACK_NOSPACE; 222 ack = RXRPC_ACK_NOSPACE;
223 goto discard_and_ack; 223 goto discard_and_ack;
224 } 224 }
225 goto out; 225 goto out;
226 } 226 }
227 227
228 skb = NULL; 228 skb = NULL;
229 229
230 _debug("post #%u", seq); 230 _debug("post #%u", seq);
231 ASSERTCMP(call->rx_data_post, ==, seq); 231 ASSERTCMP(call->rx_data_post, ==, seq);
232 call->rx_data_post++; 232 call->rx_data_post++;
233 233
234 if (sp->hdr.flags & RXRPC_LAST_PACKET) 234 if (sp->hdr.flags & RXRPC_LAST_PACKET)
235 set_bit(RXRPC_CALL_RCVD_LAST, &call->flags); 235 set_bit(RXRPC_CALL_RCVD_LAST, &call->flags);
236 236
237 /* if we've reached an out of sequence packet then we need to drain 237 /* if we've reached an out of sequence packet then we need to drain
238 * that queue into the socket Rx queue now */ 238 * that queue into the socket Rx queue now */
239 if (call->rx_data_post == call->rx_first_oos) { 239 if (call->rx_data_post == call->rx_first_oos) {
240 _debug("drain rx oos now"); 240 _debug("drain rx oos now");
241 read_lock(&call->state_lock); 241 read_lock(&call->state_lock);
242 if (call->state < RXRPC_CALL_COMPLETE && 242 if (call->state < RXRPC_CALL_COMPLETE &&
243 !test_and_set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events)) 243 !test_and_set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events))
244 rxrpc_queue_call(call); 244 rxrpc_queue_call(call);
245 read_unlock(&call->state_lock); 245 read_unlock(&call->state_lock);
246 } 246 }
247 247
248 spin_unlock(&call->lock); 248 spin_unlock(&call->lock);
249 atomic_inc(&call->ackr_not_idle); 249 atomic_inc(&call->ackr_not_idle);
250 rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, sp->hdr.serial, false); 250 rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, sp->hdr.serial, false);
251 _leave(" = 0 [posted]"); 251 _leave(" = 0 [posted]");
252 return 0; 252 return 0;
253 253
254 protocol_error: 254 protocol_error:
255 ret = -EBADMSG; 255 ret = -EBADMSG;
256 out: 256 out:
257 spin_unlock(&call->lock); 257 spin_unlock(&call->lock);
258 _leave(" = %d", ret); 258 _leave(" = %d", ret);
259 return ret; 259 return ret;
260 260
261 discard_and_ack: 261 discard_and_ack:
262 _debug("discard and ACK packet %p", skb); 262 _debug("discard and ACK packet %p", skb);
263 __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); 263 __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true);
264 discard: 264 discard:
265 spin_unlock(&call->lock); 265 spin_unlock(&call->lock);
266 rxrpc_free_skb(skb); 266 rxrpc_free_skb(skb);
267 _leave(" = 0 [discarded]"); 267 _leave(" = 0 [discarded]");
268 return 0; 268 return 0;
269 269
270 enqueue_and_ack: 270 enqueue_and_ack:
271 __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); 271 __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true);
272 enqueue_packet: 272 enqueue_packet:
273 _net("defer skb %p", skb); 273 _net("defer skb %p", skb);
274 spin_unlock(&call->lock); 274 spin_unlock(&call->lock);
275 skb_queue_tail(&call->rx_queue, skb); 275 skb_queue_tail(&call->rx_queue, skb);
276 atomic_inc(&call->ackr_not_idle); 276 atomic_inc(&call->ackr_not_idle);
277 read_lock(&call->state_lock); 277 read_lock(&call->state_lock);
278 if (call->state < RXRPC_CALL_DEAD) 278 if (call->state < RXRPC_CALL_DEAD)
279 rxrpc_queue_call(call); 279 rxrpc_queue_call(call);
280 read_unlock(&call->state_lock); 280 read_unlock(&call->state_lock);
281 _leave(" = 0 [queued]"); 281 _leave(" = 0 [queued]");
282 return 0; 282 return 0;
283 } 283 }
284 284
285 /* 285 /*
286 * assume an implicit ACKALL of the transmission phase of a client socket upon 286 * assume an implicit ACKALL of the transmission phase of a client socket upon
287 * reception of the first reply packet 287 * reception of the first reply packet
288 */ 288 */
289 static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial) 289 static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial)
290 { 290 {
291 write_lock_bh(&call->state_lock); 291 write_lock_bh(&call->state_lock);
292 292
293 switch (call->state) { 293 switch (call->state) {
294 case RXRPC_CALL_CLIENT_AWAIT_REPLY: 294 case RXRPC_CALL_CLIENT_AWAIT_REPLY:
295 call->state = RXRPC_CALL_CLIENT_RECV_REPLY; 295 call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
296 call->acks_latest = serial; 296 call->acks_latest = serial;
297 297
298 _debug("implicit ACKALL %%%u", call->acks_latest); 298 _debug("implicit ACKALL %%%u", call->acks_latest);
299 set_bit(RXRPC_CALL_RCVD_ACKALL, &call->events); 299 set_bit(RXRPC_CALL_RCVD_ACKALL, &call->events);
300 write_unlock_bh(&call->state_lock); 300 write_unlock_bh(&call->state_lock);
301 301
302 if (try_to_del_timer_sync(&call->resend_timer) >= 0) { 302 if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
303 clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); 303 clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
304 clear_bit(RXRPC_CALL_RESEND, &call->events); 304 clear_bit(RXRPC_CALL_RESEND, &call->events);
305 clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); 305 clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
306 } 306 }
307 break; 307 break;
308 308
309 default: 309 default:
310 write_unlock_bh(&call->state_lock); 310 write_unlock_bh(&call->state_lock);
311 break; 311 break;
312 } 312 }
313 } 313 }
314 314
315 /* 315 /*
316 * post an incoming packet to the nominated call to deal with 316 * post an incoming packet to the nominated call to deal with
317 * - must get rid of the sk_buff, either by freeing it or by queuing it 317 * - must get rid of the sk_buff, either by freeing it or by queuing it
318 */ 318 */
319 void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb) 319 void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb)
320 { 320 {
321 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 321 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
322 __be32 _abort_code; 322 __be32 _abort_code;
323 u32 serial, hi_serial, seq, abort_code; 323 u32 serial, hi_serial, seq, abort_code;
324 324
325 _enter("%p,%p", call, skb); 325 _enter("%p,%p", call, skb);
326 326
327 ASSERT(!irqs_disabled()); 327 ASSERT(!irqs_disabled());
328 328
329 #if 0 // INJECT RX ERROR 329 #if 0 // INJECT RX ERROR
330 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { 330 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
331 static int skip = 0; 331 static int skip = 0;
332 if (++skip == 3) { 332 if (++skip == 3) {
333 printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n"); 333 printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n");
334 skip = 0; 334 skip = 0;
335 goto free_packet; 335 goto free_packet;
336 } 336 }
337 } 337 }
338 #endif 338 #endif
339 339
340 /* track the latest serial number on this connection for ACK packet 340 /* track the latest serial number on this connection for ACK packet
341 * information */ 341 * information */
342 serial = ntohl(sp->hdr.serial); 342 serial = ntohl(sp->hdr.serial);
343 hi_serial = atomic_read(&call->conn->hi_serial); 343 hi_serial = atomic_read(&call->conn->hi_serial);
344 while (serial > hi_serial) 344 while (serial > hi_serial)
345 hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial, 345 hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial,
346 serial); 346 serial);
347 347
348 /* request ACK generation for any ACK or DATA packet that requests 348 /* request ACK generation for any ACK or DATA packet that requests
349 * it */ 349 * it */
350 if (sp->hdr.flags & RXRPC_REQUEST_ACK) { 350 if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
351 _proto("ACK Requested on %%%u", serial); 351 _proto("ACK Requested on %%%u", serial);
352 rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial, 352 rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial,
353 !(sp->hdr.flags & RXRPC_MORE_PACKETS)); 353 !(sp->hdr.flags & RXRPC_MORE_PACKETS));
354 } 354 }
355 355
356 switch (sp->hdr.type) { 356 switch (sp->hdr.type) {
357 case RXRPC_PACKET_TYPE_ABORT: 357 case RXRPC_PACKET_TYPE_ABORT:
358 _debug("abort"); 358 _debug("abort");
359 359
360 if (skb_copy_bits(skb, 0, &_abort_code, 360 if (skb_copy_bits(skb, 0, &_abort_code,
361 sizeof(_abort_code)) < 0) 361 sizeof(_abort_code)) < 0)
362 goto protocol_error; 362 goto protocol_error;
363 363
364 abort_code = ntohl(_abort_code); 364 abort_code = ntohl(_abort_code);
365 _proto("Rx ABORT %%%u { %x }", serial, abort_code); 365 _proto("Rx ABORT %%%u { %x }", serial, abort_code);
366 366
367 write_lock_bh(&call->state_lock); 367 write_lock_bh(&call->state_lock);
368 if (call->state < RXRPC_CALL_COMPLETE) { 368 if (call->state < RXRPC_CALL_COMPLETE) {
369 call->state = RXRPC_CALL_REMOTELY_ABORTED; 369 call->state = RXRPC_CALL_REMOTELY_ABORTED;
370 call->abort_code = abort_code; 370 call->abort_code = abort_code;
371 set_bit(RXRPC_CALL_RCVD_ABORT, &call->events); 371 set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
372 rxrpc_queue_call(call); 372 rxrpc_queue_call(call);
373 } 373 }
374 goto free_packet_unlock; 374 goto free_packet_unlock;
375 375
376 case RXRPC_PACKET_TYPE_BUSY: 376 case RXRPC_PACKET_TYPE_BUSY:
377 _proto("Rx BUSY %%%u", serial); 377 _proto("Rx BUSY %%%u", serial);
378 378
379 if (call->conn->out_clientflag) 379 if (call->conn->out_clientflag)
380 goto protocol_error; 380 goto protocol_error;
381 381
382 write_lock_bh(&call->state_lock); 382 write_lock_bh(&call->state_lock);
383 switch (call->state) { 383 switch (call->state) {
384 case RXRPC_CALL_CLIENT_SEND_REQUEST: 384 case RXRPC_CALL_CLIENT_SEND_REQUEST:
385 call->state = RXRPC_CALL_SERVER_BUSY; 385 call->state = RXRPC_CALL_SERVER_BUSY;
386 set_bit(RXRPC_CALL_RCVD_BUSY, &call->events); 386 set_bit(RXRPC_CALL_RCVD_BUSY, &call->events);
387 rxrpc_queue_call(call); 387 rxrpc_queue_call(call);
388 case RXRPC_CALL_SERVER_BUSY: 388 case RXRPC_CALL_SERVER_BUSY:
389 goto free_packet_unlock; 389 goto free_packet_unlock;
390 default: 390 default:
391 goto protocol_error_locked; 391 goto protocol_error_locked;
392 } 392 }
393 393
394 default: 394 default:
395 _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], serial); 395 _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], serial);
396 goto protocol_error; 396 goto protocol_error;
397 397
398 case RXRPC_PACKET_TYPE_DATA: 398 case RXRPC_PACKET_TYPE_DATA:
399 seq = ntohl(sp->hdr.seq); 399 seq = ntohl(sp->hdr.seq);
400 400
401 _proto("Rx DATA %%%u { #%u }", serial, seq); 401 _proto("Rx DATA %%%u { #%u }", serial, seq);
402 402
403 if (seq == 0) 403 if (seq == 0)
404 goto protocol_error; 404 goto protocol_error;
405 405
406 call->ackr_prev_seq = sp->hdr.seq; 406 call->ackr_prev_seq = sp->hdr.seq;
407 407
408 /* received data implicitly ACKs all of the request packets we 408 /* received data implicitly ACKs all of the request packets we
409 * sent when we're acting as a client */ 409 * sent when we're acting as a client */
410 if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) 410 if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY)
411 rxrpc_assume_implicit_ackall(call, serial); 411 rxrpc_assume_implicit_ackall(call, serial);
412 412
413 switch (rxrpc_fast_process_data(call, skb, seq)) { 413 switch (rxrpc_fast_process_data(call, skb, seq)) {
414 case 0: 414 case 0:
415 skb = NULL; 415 skb = NULL;
416 goto done; 416 goto done;
417 417
418 default: 418 default:
419 BUG(); 419 BUG();
420 420
421 /* data packet received beyond the last packet */ 421 /* data packet received beyond the last packet */
422 case -EBADMSG: 422 case -EBADMSG:
423 goto protocol_error; 423 goto protocol_error;
424 } 424 }
425 425
426 case RXRPC_PACKET_TYPE_ACKALL:
426 case RXRPC_PACKET_TYPE_ACK: 427 case RXRPC_PACKET_TYPE_ACK:
427 /* ACK processing is done in process context */ 428 /* ACK processing is done in process context */
428 read_lock_bh(&call->state_lock); 429 read_lock_bh(&call->state_lock);
429 if (call->state < RXRPC_CALL_DEAD) { 430 if (call->state < RXRPC_CALL_DEAD) {
430 skb_queue_tail(&call->rx_queue, skb); 431 skb_queue_tail(&call->rx_queue, skb);
431 rxrpc_queue_call(call); 432 rxrpc_queue_call(call);
432 skb = NULL; 433 skb = NULL;
433 } 434 }
434 read_unlock_bh(&call->state_lock); 435 read_unlock_bh(&call->state_lock);
435 goto free_packet; 436 goto free_packet;
436 } 437 }
437 438
438 protocol_error: 439 protocol_error:
439 _debug("protocol error"); 440 _debug("protocol error");
440 write_lock_bh(&call->state_lock); 441 write_lock_bh(&call->state_lock);
441 protocol_error_locked: 442 protocol_error_locked:
442 if (call->state <= RXRPC_CALL_COMPLETE) { 443 if (call->state <= RXRPC_CALL_COMPLETE) {
443 call->state = RXRPC_CALL_LOCALLY_ABORTED; 444 call->state = RXRPC_CALL_LOCALLY_ABORTED;
444 call->abort_code = RX_PROTOCOL_ERROR; 445 call->abort_code = RX_PROTOCOL_ERROR;
445 set_bit(RXRPC_CALL_ABORT, &call->events); 446 set_bit(RXRPC_CALL_ABORT, &call->events);
446 rxrpc_queue_call(call); 447 rxrpc_queue_call(call);
447 } 448 }
448 free_packet_unlock: 449 free_packet_unlock:
449 write_unlock_bh(&call->state_lock); 450 write_unlock_bh(&call->state_lock);
450 free_packet: 451 free_packet:
451 rxrpc_free_skb(skb); 452 rxrpc_free_skb(skb);
452 done: 453 done:
453 _leave(""); 454 _leave("");
454 } 455 }
455 456
456 /* 457 /*
457 * split up a jumbo data packet 458 * split up a jumbo data packet
458 */ 459 */
459 static void rxrpc_process_jumbo_packet(struct rxrpc_call *call, 460 static void rxrpc_process_jumbo_packet(struct rxrpc_call *call,
460 struct sk_buff *jumbo) 461 struct sk_buff *jumbo)
461 { 462 {
462 struct rxrpc_jumbo_header jhdr; 463 struct rxrpc_jumbo_header jhdr;
463 struct rxrpc_skb_priv *sp; 464 struct rxrpc_skb_priv *sp;
464 struct sk_buff *part; 465 struct sk_buff *part;
465 466
466 _enter(",{%u,%u}", jumbo->data_len, jumbo->len); 467 _enter(",{%u,%u}", jumbo->data_len, jumbo->len);
467 468
468 sp = rxrpc_skb(jumbo); 469 sp = rxrpc_skb(jumbo);
469 470
470 do { 471 do {
471 sp->hdr.flags &= ~RXRPC_JUMBO_PACKET; 472 sp->hdr.flags &= ~RXRPC_JUMBO_PACKET;
472 473
473 /* make a clone to represent the first subpacket in what's left 474 /* make a clone to represent the first subpacket in what's left
474 * of the jumbo packet */ 475 * of the jumbo packet */
475 part = skb_clone(jumbo, GFP_ATOMIC); 476 part = skb_clone(jumbo, GFP_ATOMIC);
476 if (!part) { 477 if (!part) {
477 /* simply ditch the tail in the event of ENOMEM */ 478 /* simply ditch the tail in the event of ENOMEM */
478 pskb_trim(jumbo, RXRPC_JUMBO_DATALEN); 479 pskb_trim(jumbo, RXRPC_JUMBO_DATALEN);
479 break; 480 break;
480 } 481 }
481 rxrpc_new_skb(part); 482 rxrpc_new_skb(part);
482 483
483 pskb_trim(part, RXRPC_JUMBO_DATALEN); 484 pskb_trim(part, RXRPC_JUMBO_DATALEN);
484 485
485 if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN)) 486 if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN))
486 goto protocol_error; 487 goto protocol_error;
487 488
488 if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0) 489 if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0)
489 goto protocol_error; 490 goto protocol_error;
490 if (!pskb_pull(jumbo, sizeof(jhdr))) 491 if (!pskb_pull(jumbo, sizeof(jhdr)))
491 BUG(); 492 BUG();
492 493
493 sp->hdr.seq = htonl(ntohl(sp->hdr.seq) + 1); 494 sp->hdr.seq = htonl(ntohl(sp->hdr.seq) + 1);
494 sp->hdr.serial = htonl(ntohl(sp->hdr.serial) + 1); 495 sp->hdr.serial = htonl(ntohl(sp->hdr.serial) + 1);
495 sp->hdr.flags = jhdr.flags; 496 sp->hdr.flags = jhdr.flags;
496 sp->hdr._rsvd = jhdr._rsvd; 497 sp->hdr._rsvd = jhdr._rsvd;
497 498
498 _proto("Rx DATA Jumbo %%%u", ntohl(sp->hdr.serial) - 1); 499 _proto("Rx DATA Jumbo %%%u", ntohl(sp->hdr.serial) - 1);
499 500
500 rxrpc_fast_process_packet(call, part); 501 rxrpc_fast_process_packet(call, part);
501 part = NULL; 502 part = NULL;
502 503
503 } while (sp->hdr.flags & RXRPC_JUMBO_PACKET); 504 } while (sp->hdr.flags & RXRPC_JUMBO_PACKET);
504 505
505 rxrpc_fast_process_packet(call, jumbo); 506 rxrpc_fast_process_packet(call, jumbo);
506 _leave(""); 507 _leave("");
507 return; 508 return;
508 509
509 protocol_error: 510 protocol_error:
510 _debug("protocol error"); 511 _debug("protocol error");
511 rxrpc_free_skb(part); 512 rxrpc_free_skb(part);
512 rxrpc_free_skb(jumbo); 513 rxrpc_free_skb(jumbo);
513 write_lock_bh(&call->state_lock); 514 write_lock_bh(&call->state_lock);
514 if (call->state <= RXRPC_CALL_COMPLETE) { 515 if (call->state <= RXRPC_CALL_COMPLETE) {
515 call->state = RXRPC_CALL_LOCALLY_ABORTED; 516 call->state = RXRPC_CALL_LOCALLY_ABORTED;
516 call->abort_code = RX_PROTOCOL_ERROR; 517 call->abort_code = RX_PROTOCOL_ERROR;
517 set_bit(RXRPC_CALL_ABORT, &call->events); 518 set_bit(RXRPC_CALL_ABORT, &call->events);
518 rxrpc_queue_call(call); 519 rxrpc_queue_call(call);
519 } 520 }
520 write_unlock_bh(&call->state_lock); 521 write_unlock_bh(&call->state_lock);
521 _leave(""); 522 _leave("");
522 } 523 }
523 524
524 /* 525 /*
525 * post an incoming packet to the appropriate call/socket to deal with 526 * post an incoming packet to the appropriate call/socket to deal with
526 * - must get rid of the sk_buff, either by freeing it or by queuing it 527 * - must get rid of the sk_buff, either by freeing it or by queuing it
527 */ 528 */
528 static void rxrpc_post_packet_to_call(struct rxrpc_connection *conn, 529 static void rxrpc_post_packet_to_call(struct rxrpc_connection *conn,
529 struct sk_buff *skb) 530 struct sk_buff *skb)
530 { 531 {
531 struct rxrpc_skb_priv *sp; 532 struct rxrpc_skb_priv *sp;
532 struct rxrpc_call *call; 533 struct rxrpc_call *call;
533 struct rb_node *p; 534 struct rb_node *p;
534 __be32 call_id; 535 __be32 call_id;
535 536
536 _enter("%p,%p", conn, skb); 537 _enter("%p,%p", conn, skb);
537 538
538 read_lock_bh(&conn->lock); 539 read_lock_bh(&conn->lock);
539 540
540 sp = rxrpc_skb(skb); 541 sp = rxrpc_skb(skb);
541 542
542 /* look at extant calls by channel number first */ 543 /* look at extant calls by channel number first */
543 call = conn->channels[ntohl(sp->hdr.cid) & RXRPC_CHANNELMASK]; 544 call = conn->channels[ntohl(sp->hdr.cid) & RXRPC_CHANNELMASK];
544 if (!call || call->call_id != sp->hdr.callNumber) 545 if (!call || call->call_id != sp->hdr.callNumber)
545 goto call_not_extant; 546 goto call_not_extant;
546 547
547 _debug("extant call [%d]", call->state); 548 _debug("extant call [%d]", call->state);
548 ASSERTCMP(call->conn, ==, conn); 549 ASSERTCMP(call->conn, ==, conn);
549 550
550 read_lock(&call->state_lock); 551 read_lock(&call->state_lock);
551 switch (call->state) { 552 switch (call->state) {
552 case RXRPC_CALL_LOCALLY_ABORTED: 553 case RXRPC_CALL_LOCALLY_ABORTED:
553 if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events)) 554 if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
554 rxrpc_queue_call(call); 555 rxrpc_queue_call(call);
555 case RXRPC_CALL_REMOTELY_ABORTED: 556 case RXRPC_CALL_REMOTELY_ABORTED:
556 case RXRPC_CALL_NETWORK_ERROR: 557 case RXRPC_CALL_NETWORK_ERROR:
557 case RXRPC_CALL_DEAD: 558 case RXRPC_CALL_DEAD:
558 goto free_unlock; 559 goto free_unlock;
559 default: 560 default:
560 break; 561 break;
561 } 562 }
562 563
563 read_unlock(&call->state_lock); 564 read_unlock(&call->state_lock);
564 rxrpc_get_call(call); 565 rxrpc_get_call(call);
565 read_unlock_bh(&conn->lock); 566 read_unlock_bh(&conn->lock);
566 567
567 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && 568 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
568 sp->hdr.flags & RXRPC_JUMBO_PACKET) 569 sp->hdr.flags & RXRPC_JUMBO_PACKET)
569 rxrpc_process_jumbo_packet(call, skb); 570 rxrpc_process_jumbo_packet(call, skb);
570 else 571 else
571 rxrpc_fast_process_packet(call, skb); 572 rxrpc_fast_process_packet(call, skb);
572 573
573 rxrpc_put_call(call); 574 rxrpc_put_call(call);
574 goto done; 575 goto done;
575 576
576 call_not_extant: 577 call_not_extant:
577 /* search the completed calls in case what we're dealing with is 578 /* search the completed calls in case what we're dealing with is
578 * there */ 579 * there */
579 _debug("call not extant"); 580 _debug("call not extant");
580 581
581 call_id = sp->hdr.callNumber; 582 call_id = sp->hdr.callNumber;
582 p = conn->calls.rb_node; 583 p = conn->calls.rb_node;
583 while (p) { 584 while (p) {
584 call = rb_entry(p, struct rxrpc_call, conn_node); 585 call = rb_entry(p, struct rxrpc_call, conn_node);
585 586
586 if (call_id < call->call_id) 587 if (call_id < call->call_id)
587 p = p->rb_left; 588 p = p->rb_left;
588 else if (call_id > call->call_id) 589 else if (call_id > call->call_id)
589 p = p->rb_right; 590 p = p->rb_right;
590 else 591 else
591 goto found_completed_call; 592 goto found_completed_call;
592 } 593 }
593 594
594 dead_call: 595 dead_call:
595 /* it's a either a really old call that we no longer remember or its a 596 /* it's a either a really old call that we no longer remember or its a
596 * new incoming call */ 597 * new incoming call */
597 read_unlock_bh(&conn->lock); 598 read_unlock_bh(&conn->lock);
598 599
599 if (sp->hdr.flags & RXRPC_CLIENT_INITIATED && 600 if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
600 sp->hdr.seq == cpu_to_be32(1)) { 601 sp->hdr.seq == cpu_to_be32(1)) {
601 _debug("incoming call"); 602 _debug("incoming call");
602 skb_queue_tail(&conn->trans->local->accept_queue, skb); 603 skb_queue_tail(&conn->trans->local->accept_queue, skb);
603 rxrpc_queue_work(&conn->trans->local->acceptor); 604 rxrpc_queue_work(&conn->trans->local->acceptor);
604 goto done; 605 goto done;
605 } 606 }
606 607
607 _debug("dead call"); 608 _debug("dead call");
608 skb->priority = RX_CALL_DEAD; 609 skb->priority = RX_CALL_DEAD;
609 rxrpc_reject_packet(conn->trans->local, skb); 610 rxrpc_reject_packet(conn->trans->local, skb);
610 goto done; 611 goto done;
611 612
612 /* resend last packet of a completed call 613 /* resend last packet of a completed call
613 * - client calls may have been aborted or ACK'd 614 * - client calls may have been aborted or ACK'd
614 * - server calls may have been aborted 615 * - server calls may have been aborted
615 */ 616 */
616 found_completed_call: 617 found_completed_call:
617 _debug("completed call"); 618 _debug("completed call");
618 619
619 if (atomic_read(&call->usage) == 0) 620 if (atomic_read(&call->usage) == 0)
620 goto dead_call; 621 goto dead_call;
621 622
622 /* synchronise any state changes */ 623 /* synchronise any state changes */
623 read_lock(&call->state_lock); 624 read_lock(&call->state_lock);
624 ASSERTIFCMP(call->state != RXRPC_CALL_CLIENT_FINAL_ACK, 625 ASSERTIFCMP(call->state != RXRPC_CALL_CLIENT_FINAL_ACK,
625 call->state, >=, RXRPC_CALL_COMPLETE); 626 call->state, >=, RXRPC_CALL_COMPLETE);
626 627
627 if (call->state == RXRPC_CALL_LOCALLY_ABORTED || 628 if (call->state == RXRPC_CALL_LOCALLY_ABORTED ||
628 call->state == RXRPC_CALL_REMOTELY_ABORTED || 629 call->state == RXRPC_CALL_REMOTELY_ABORTED ||
629 call->state == RXRPC_CALL_DEAD) { 630 call->state == RXRPC_CALL_DEAD) {
630 read_unlock(&call->state_lock); 631 read_unlock(&call->state_lock);
631 goto dead_call; 632 goto dead_call;
632 } 633 }
633 634
634 if (call->conn->in_clientflag) { 635 if (call->conn->in_clientflag) {
635 read_unlock(&call->state_lock); 636 read_unlock(&call->state_lock);
636 goto dead_call; /* complete server call */ 637 goto dead_call; /* complete server call */
637 } 638 }
638 639
639 _debug("final ack again"); 640 _debug("final ack again");
640 rxrpc_get_call(call); 641 rxrpc_get_call(call);
641 set_bit(RXRPC_CALL_ACK_FINAL, &call->events); 642 set_bit(RXRPC_CALL_ACK_FINAL, &call->events);
642 rxrpc_queue_call(call); 643 rxrpc_queue_call(call);
643 644
644 free_unlock: 645 free_unlock:
645 read_unlock(&call->state_lock); 646 read_unlock(&call->state_lock);
646 read_unlock_bh(&conn->lock); 647 read_unlock_bh(&conn->lock);
647 rxrpc_free_skb(skb); 648 rxrpc_free_skb(skb);
648 done: 649 done:
649 _leave(""); 650 _leave("");
650 } 651 }
651 652
652 /* 653 /*
653 * post connection-level events to the connection 654 * post connection-level events to the connection
654 * - this includes challenges, responses and some aborts 655 * - this includes challenges, responses and some aborts
655 */ 656 */
656 static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, 657 static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
657 struct sk_buff *skb) 658 struct sk_buff *skb)
658 { 659 {
659 _enter("%p,%p", conn, skb); 660 _enter("%p,%p", conn, skb);
660 661
661 atomic_inc(&conn->usage); 662 atomic_inc(&conn->usage);
662 skb_queue_tail(&conn->rx_queue, skb); 663 skb_queue_tail(&conn->rx_queue, skb);
663 rxrpc_queue_conn(conn); 664 rxrpc_queue_conn(conn);
664 } 665 }
665 666
666 /* 667 /*
667 * handle data received on the local endpoint 668 * handle data received on the local endpoint
668 * - may be called in interrupt context 669 * - may be called in interrupt context
669 */ 670 */
670 void rxrpc_data_ready(struct sock *sk, int count) 671 void rxrpc_data_ready(struct sock *sk, int count)
671 { 672 {
672 struct rxrpc_connection *conn; 673 struct rxrpc_connection *conn;
673 struct rxrpc_transport *trans; 674 struct rxrpc_transport *trans;
674 struct rxrpc_skb_priv *sp; 675 struct rxrpc_skb_priv *sp;
675 struct rxrpc_local *local; 676 struct rxrpc_local *local;
676 struct rxrpc_peer *peer; 677 struct rxrpc_peer *peer;
677 struct sk_buff *skb; 678 struct sk_buff *skb;
678 int ret; 679 int ret;
679 680
680 _enter("%p, %d", sk, count); 681 _enter("%p, %d", sk, count);
681 682
682 ASSERT(!irqs_disabled()); 683 ASSERT(!irqs_disabled());
683 684
684 read_lock_bh(&rxrpc_local_lock); 685 read_lock_bh(&rxrpc_local_lock);
685 local = sk->sk_user_data; 686 local = sk->sk_user_data;
686 if (local && atomic_read(&local->usage) > 0) 687 if (local && atomic_read(&local->usage) > 0)
687 rxrpc_get_local(local); 688 rxrpc_get_local(local);
688 else 689 else
689 local = NULL; 690 local = NULL;
690 read_unlock_bh(&rxrpc_local_lock); 691 read_unlock_bh(&rxrpc_local_lock);
691 if (!local) { 692 if (!local) {
692 _leave(" [local dead]"); 693 _leave(" [local dead]");
693 return; 694 return;
694 } 695 }
695 696
696 skb = skb_recv_datagram(sk, 0, 1, &ret); 697 skb = skb_recv_datagram(sk, 0, 1, &ret);
697 if (!skb) { 698 if (!skb) {
698 rxrpc_put_local(local); 699 rxrpc_put_local(local);
699 if (ret == -EAGAIN) 700 if (ret == -EAGAIN)
700 return; 701 return;
701 _debug("UDP socket error %d", ret); 702 _debug("UDP socket error %d", ret);
702 return; 703 return;
703 } 704 }
704 705
705 rxrpc_new_skb(skb); 706 rxrpc_new_skb(skb);
706 707
707 _net("recv skb %p", skb); 708 _net("recv skb %p", skb);
708 709
709 /* we'll probably need to checksum it (didn't call sock_recvmsg) */ 710 /* we'll probably need to checksum it (didn't call sock_recvmsg) */
710 if (skb_checksum_complete(skb)) { 711 if (skb_checksum_complete(skb)) {
711 rxrpc_free_skb(skb); 712 rxrpc_free_skb(skb);
712 rxrpc_put_local(local); 713 rxrpc_put_local(local);
713 UDP_INC_STATS_BH(&init_net, UDP_MIB_INERRORS, 0); 714 UDP_INC_STATS_BH(&init_net, UDP_MIB_INERRORS, 0);
714 _leave(" [CSUM failed]"); 715 _leave(" [CSUM failed]");
715 return; 716 return;
716 } 717 }
717 718
718 UDP_INC_STATS_BH(&init_net, UDP_MIB_INDATAGRAMS, 0); 719 UDP_INC_STATS_BH(&init_net, UDP_MIB_INDATAGRAMS, 0);
719 720
720 /* the socket buffer we have is owned by UDP, with UDP's data all over 721 /* the socket buffer we have is owned by UDP, with UDP's data all over
721 * it, but we really want our own */ 722 * it, but we really want our own */
722 skb_orphan(skb); 723 skb_orphan(skb);
723 sp = rxrpc_skb(skb); 724 sp = rxrpc_skb(skb);
724 memset(sp, 0, sizeof(*sp)); 725 memset(sp, 0, sizeof(*sp));
725 726
726 _net("Rx UDP packet from %08x:%04hu", 727 _net("Rx UDP packet from %08x:%04hu",
727 ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source)); 728 ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source));
728 729
729 /* dig out the RxRPC connection details */ 730 /* dig out the RxRPC connection details */
730 if (skb_copy_bits(skb, sizeof(struct udphdr), &sp->hdr, 731 if (skb_copy_bits(skb, sizeof(struct udphdr), &sp->hdr,
731 sizeof(sp->hdr)) < 0) 732 sizeof(sp->hdr)) < 0)
732 goto bad_message; 733 goto bad_message;
733 if (!pskb_pull(skb, sizeof(struct udphdr) + sizeof(sp->hdr))) 734 if (!pskb_pull(skb, sizeof(struct udphdr) + sizeof(sp->hdr)))
734 BUG(); 735 BUG();
735 736
736 _net("Rx RxRPC %s ep=%x call=%x:%x", 737 _net("Rx RxRPC %s ep=%x call=%x:%x",
737 sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient", 738 sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient",
738 ntohl(sp->hdr.epoch), 739 ntohl(sp->hdr.epoch),
739 ntohl(sp->hdr.cid), 740 ntohl(sp->hdr.cid),
740 ntohl(sp->hdr.callNumber)); 741 ntohl(sp->hdr.callNumber));
741 742
742 if (sp->hdr.type == 0 || sp->hdr.type >= RXRPC_N_PACKET_TYPES) { 743 if (sp->hdr.type == 0 || sp->hdr.type >= RXRPC_N_PACKET_TYPES) {
743 _proto("Rx Bad Packet Type %u", sp->hdr.type); 744 _proto("Rx Bad Packet Type %u", sp->hdr.type);
744 goto bad_message; 745 goto bad_message;
745 } 746 }
746 747
747 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && 748 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
748 (sp->hdr.callNumber == 0 || sp->hdr.seq == 0)) 749 (sp->hdr.callNumber == 0 || sp->hdr.seq == 0))
749 goto bad_message; 750 goto bad_message;
750 751
751 peer = rxrpc_find_peer(local, ip_hdr(skb)->saddr, udp_hdr(skb)->source); 752 peer = rxrpc_find_peer(local, ip_hdr(skb)->saddr, udp_hdr(skb)->source);
752 if (IS_ERR(peer)) 753 if (IS_ERR(peer))
753 goto cant_route_call; 754 goto cant_route_call;
754 755
755 trans = rxrpc_find_transport(local, peer); 756 trans = rxrpc_find_transport(local, peer);
756 rxrpc_put_peer(peer); 757 rxrpc_put_peer(peer);
757 if (!trans) 758 if (!trans)
758 goto cant_route_call; 759 goto cant_route_call;
759 760
760 conn = rxrpc_find_connection(trans, &sp->hdr); 761 conn = rxrpc_find_connection(trans, &sp->hdr);
761 rxrpc_put_transport(trans); 762 rxrpc_put_transport(trans);
762 if (!conn) 763 if (!conn)
763 goto cant_route_call; 764 goto cant_route_call;
764 765
765 _debug("CONN %p {%d}", conn, conn->debug_id); 766 _debug("CONN %p {%d}", conn, conn->debug_id);
766 767
767 if (sp->hdr.callNumber == 0) 768 if (sp->hdr.callNumber == 0)
768 rxrpc_post_packet_to_conn(conn, skb); 769 rxrpc_post_packet_to_conn(conn, skb);
769 else 770 else
770 rxrpc_post_packet_to_call(conn, skb); 771 rxrpc_post_packet_to_call(conn, skb);
771 rxrpc_put_connection(conn); 772 rxrpc_put_connection(conn);
772 rxrpc_put_local(local); 773 rxrpc_put_local(local);
773 return; 774 return;
774 775
775 cant_route_call: 776 cant_route_call:
776 _debug("can't route call"); 777 _debug("can't route call");
777 if (sp->hdr.flags & RXRPC_CLIENT_INITIATED && 778 if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
778 sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { 779 sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
779 if (sp->hdr.seq == cpu_to_be32(1)) { 780 if (sp->hdr.seq == cpu_to_be32(1)) {
780 _debug("first packet"); 781 _debug("first packet");
781 skb_queue_tail(&local->accept_queue, skb); 782 skb_queue_tail(&local->accept_queue, skb);
782 rxrpc_queue_work(&local->acceptor); 783 rxrpc_queue_work(&local->acceptor);
783 rxrpc_put_local(local); 784 rxrpc_put_local(local);
784 _leave(" [incoming]"); 785 _leave(" [incoming]");
785 return; 786 return;
786 } 787 }
787 skb->priority = RX_INVALID_OPERATION; 788 skb->priority = RX_INVALID_OPERATION;
788 } else { 789 } else {
789 skb->priority = RX_CALL_DEAD; 790 skb->priority = RX_CALL_DEAD;
790 } 791 }
791 792
792 _debug("reject"); 793 _debug("reject");
793 rxrpc_reject_packet(local, skb); 794 rxrpc_reject_packet(local, skb);
794 rxrpc_put_local(local); 795 rxrpc_put_local(local);
795 _leave(" [no call]"); 796 _leave(" [no call]");
796 return; 797 return;
797 798
798 bad_message: 799 bad_message:
799 skb->priority = RX_PROTOCOL_ERROR; 800 skb->priority = RX_PROTOCOL_ERROR;
800 rxrpc_reject_packet(local, skb); 801 rxrpc_reject_packet(local, skb);
801 rxrpc_put_local(local); 802 rxrpc_put_local(local);
802 _leave(" [badmsg]"); 803 _leave(" [badmsg]");
803 } 804 }
804 805