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net/ipv4/fib_frontend.c
23.9 KB
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/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * IPv4 Forwarding Information Base: FIB frontend. * |
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ |
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#include <linux/module.h> #include <asm/uaccess.h> #include <asm/system.h> #include <linux/bitops.h> |
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#include <linux/capability.h> |
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#include <linux/types.h> #include <linux/kernel.h> |
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#include <linux/mm.h> #include <linux/string.h> #include <linux/socket.h> #include <linux/sockios.h> #include <linux/errno.h> #include <linux/in.h> #include <linux/inet.h> |
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#include <linux/inetdevice.h> |
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#include <linux/netdevice.h> |
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#include <linux/if_addr.h> |
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#include <linux/if_arp.h> #include <linux/skbuff.h> |
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#include <linux/init.h> |
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#include <linux/list.h> |
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#include <linux/slab.h> |
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#include <net/ip.h> #include <net/protocol.h> #include <net/route.h> #include <net/tcp.h> #include <net/sock.h> |
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#include <net/arp.h> #include <net/ip_fib.h> |
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#include <net/rtnetlink.h> |
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|
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#ifndef CONFIG_IP_MULTIPLE_TABLES |
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static int __net_init fib4_rules_init(struct net *net) |
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{ |
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struct fib_table *local_table, *main_table; |
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local_table = fib_trie_table(RT_TABLE_LOCAL); |
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if (local_table == NULL) |
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return -ENOMEM; |
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main_table = fib_trie_table(RT_TABLE_MAIN); |
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if (main_table == NULL) |
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goto fail; |
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hlist_add_head_rcu(&local_table->tb_hlist, |
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&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
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hlist_add_head_rcu(&main_table->tb_hlist, |
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&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
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return 0; fail: |
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kfree(local_table); |
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return -ENOMEM; |
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} |
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#else |
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|
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struct fib_table *fib_new_table(struct net *net, u32 id) |
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{ struct fib_table *tb; |
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unsigned int h; |
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|
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if (id == 0) id = RT_TABLE_MAIN; |
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tb = fib_get_table(net, id); |
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if (tb) return tb; |
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|
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tb = fib_trie_table(id); |
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if (!tb) return NULL; |
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h = id & (FIB_TABLE_HASHSZ - 1); |
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hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
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return tb; } |
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struct fib_table *fib_get_table(struct net *net, u32 id) |
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{ struct fib_table *tb; struct hlist_node *node; |
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struct hlist_head *head; |
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unsigned int h; |
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|
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if (id == 0) id = RT_TABLE_MAIN; h = id & (FIB_TABLE_HASHSZ - 1); |
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|
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rcu_read_lock(); |
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head = &net->ipv4.fib_table_hash[h]; hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { |
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if (tb->tb_id == id) { rcu_read_unlock(); return tb; } } rcu_read_unlock(); return NULL; } |
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#endif /* CONFIG_IP_MULTIPLE_TABLES */ |
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static void fib_flush(struct net *net) |
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{ int flushed = 0; |
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struct fib_table *tb; |
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struct hlist_node *node; |
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struct hlist_head *head; |
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unsigned int h; |
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|
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for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
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head = &net->ipv4.fib_table_hash[h]; hlist_for_each_entry(tb, node, head, tb_hlist) |
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flushed += fib_table_flush(tb); |
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} |
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if (flushed) |
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rt_cache_flush(net, -1); |
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} |
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/* * Find address type as if only "dev" was present in the system. If * on_dev is NULL then all interfaces are taken into consideration. */ |
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static inline unsigned __inet_dev_addr_type(struct net *net, const struct net_device *dev, |
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__be32 addr) |
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{ |
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struct flowi4 fl4 = { .daddr = addr }; |
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struct fib_result res; unsigned ret = RTN_BROADCAST; |
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struct fib_table *local_table; |
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|
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if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
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return RTN_BROADCAST; |
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if (ipv4_is_multicast(addr)) |
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return RTN_MULTICAST; #ifdef CONFIG_IP_MULTIPLE_TABLES res.r = NULL; #endif |
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|
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local_table = fib_get_table(net, RT_TABLE_LOCAL); |
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if (local_table) { |
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ret = RTN_UNICAST; |
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rcu_read_lock(); |
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if (!fib_table_lookup(local_table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
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if (!dev || dev == res.fi->fib_dev) ret = res.type; |
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} |
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rcu_read_unlock(); |
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} return ret; } |
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unsigned int inet_addr_type(struct net *net, __be32 addr) |
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{ |
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return __inet_dev_addr_type(net, NULL, addr); |
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} |
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EXPORT_SYMBOL(inet_addr_type); |
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|
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unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr) |
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{ |
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return __inet_dev_addr_type(net, dev, addr); |
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} |
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EXPORT_SYMBOL(inet_dev_addr_type); |
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|
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/* Given (packet source, input interface) and optional (dst, oif, tos): |
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* - (main) check, that source is valid i.e. not broadcast or our local * address. * - figure out what "logical" interface this packet arrived * and calculate "specific destination" address. * - check, that packet arrived from expected physical interface. |
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* called with rcu_read_lock() |
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*/ |
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int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
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struct net_device *dev, __be32 *spec_dst, u32 *itag, u32 mark) |
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{ struct in_device *in_dev; |
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struct flowi4 fl4; |
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struct fib_result res; |
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int no_addr, rpf, accept_local; |
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bool dev_match; |
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int ret; |
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struct net *net; |
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fl4.flowi4_oif = 0; fl4.flowi4_iif = oif; fl4.flowi4_mark = mark; fl4.daddr = src; fl4.saddr = dst; fl4.flowi4_tos = tos; fl4.flowi4_scope = RT_SCOPE_UNIVERSE; |
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|
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no_addr = rpf = accept_local = 0; |
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in_dev = __in_dev_get_rcu(dev); |
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if (in_dev) { no_addr = in_dev->ifa_list == NULL; rpf = IN_DEV_RPFILTER(in_dev); |
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accept_local = IN_DEV_ACCEPT_LOCAL(in_dev); |
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if (mark && !IN_DEV_SRC_VMARK(in_dev)) |
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fl4.flowi4_mark = 0; |
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} |
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if (in_dev == NULL) goto e_inval; |
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net = dev_net(dev); |
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if (fib_lookup(net, &fl4, &res)) |
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goto last_resort; |
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if (res.type != RTN_UNICAST) { if (res.type != RTN_LOCAL || !accept_local) |
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goto e_inval; |
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} |
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*spec_dst = FIB_RES_PREFSRC(res); fib_combine_itag(itag, &res); |
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dev_match = false; |
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#ifdef CONFIG_IP_ROUTE_MULTIPATH |
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for (ret = 0; ret < res.fi->fib_nhs; ret++) { struct fib_nh *nh = &res.fi->fib_nh[ret]; if (nh->nh_dev == dev) { dev_match = true; break; } } |
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#else if (FIB_RES_DEV(res) == dev) |
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dev_match = true; |
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#endif |
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if (dev_match) { |
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ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
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return ret; } |
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if (no_addr) goto last_resort; |
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if (rpf == 1) |
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goto e_rpf; |
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fl4.flowi4_oif = dev->ifindex; |
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ret = 0; |
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if (fib_lookup(net, &fl4, &res) == 0) { |
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if (res.type == RTN_UNICAST) { *spec_dst = FIB_RES_PREFSRC(res); ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; } |
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} return ret; last_resort: if (rpf) |
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goto e_rpf; |
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*spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); *itag = 0; return 0; |
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e_inval: return -EINVAL; |
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e_rpf: return -EXDEV; |
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} |
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static inline __be32 sk_extract_addr(struct sockaddr *addr) |
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{ return ((struct sockaddr_in *) addr)->sin_addr.s_addr; } static int put_rtax(struct nlattr *mx, int len, int type, u32 value) { struct nlattr *nla; nla = (struct nlattr *) ((char *) mx + len); nla->nla_type = type; nla->nla_len = nla_attr_size(4); *(u32 *) nla_data(nla) = value; return len + nla_total_size(4); } |
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static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
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struct fib_config *cfg) { |
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__be32 addr; |
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int plen; memset(cfg, 0, sizeof(*cfg)); |
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cfg->fc_nlinfo.nl_net = net; |
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if (rt->rt_dst.sa_family != AF_INET) return -EAFNOSUPPORT; /* * Check mask for validity: * a) it must be contiguous. * b) destination must have all host bits clear. * c) if application forgot to set correct family (AF_INET), * reject request unless it is absolutely clear i.e. * both family and mask are zero. */ plen = 32; addr = sk_extract_addr(&rt->rt_dst); if (!(rt->rt_flags & RTF_HOST)) { |
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__be32 mask = sk_extract_addr(&rt->rt_genmask); |
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if (rt->rt_genmask.sa_family != AF_INET) { if (mask || rt->rt_genmask.sa_family) return -EAFNOSUPPORT; } if (bad_mask(mask, addr)) return -EINVAL; plen = inet_mask_len(mask); } cfg->fc_dst_len = plen; cfg->fc_dst = addr; if (cmd != SIOCDELRT) { cfg->fc_nlflags = NLM_F_CREATE; cfg->fc_protocol = RTPROT_BOOT; } if (rt->rt_metric) cfg->fc_priority = rt->rt_metric - 1; if (rt->rt_flags & RTF_REJECT) { cfg->fc_scope = RT_SCOPE_HOST; cfg->fc_type = RTN_UNREACHABLE; return 0; } cfg->fc_scope = RT_SCOPE_NOWHERE; cfg->fc_type = RTN_UNICAST; if (rt->rt_dev) { char *colon; struct net_device *dev; char devname[IFNAMSIZ]; if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) return -EFAULT; devname[IFNAMSIZ-1] = 0; colon = strchr(devname, ':'); if (colon) *colon = 0; |
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dev = __dev_get_by_name(net, devname); |
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if (!dev) return -ENODEV; cfg->fc_oif = dev->ifindex; if (colon) { struct in_ifaddr *ifa; struct in_device *in_dev = __in_dev_get_rtnl(dev); if (!in_dev) return -ENODEV; *colon = ':'; for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) if (strcmp(ifa->ifa_label, devname) == 0) break; if (ifa == NULL) return -ENODEV; cfg->fc_prefsrc = ifa->ifa_local; } } addr = sk_extract_addr(&rt->rt_gateway); if (rt->rt_gateway.sa_family == AF_INET && addr) { cfg->fc_gw = addr; if (rt->rt_flags & RTF_GATEWAY && |
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inet_addr_type(net, addr) == RTN_UNICAST) |
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cfg->fc_scope = RT_SCOPE_UNIVERSE; } if (cmd == SIOCDELRT) return 0; if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) return -EINVAL; if (cfg->fc_scope == RT_SCOPE_NOWHERE) cfg->fc_scope = RT_SCOPE_LINK; if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { struct nlattr *mx; int len = 0; mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); |
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if (mx == NULL) |
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return -ENOMEM; if (rt->rt_flags & RTF_MTU) len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); if (rt->rt_flags & RTF_WINDOW) len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); if (rt->rt_flags & RTF_IRTT) len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); cfg->fc_mx = mx; cfg->fc_mx_len = len; } return 0; } |
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/* |
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* Handle IP routing ioctl calls. * These are used to manipulate the routing tables |
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*/ |
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int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
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{ |
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struct fib_config cfg; struct rtentry rt; |
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int err; |
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switch (cmd) { case SIOCADDRT: /* Add a route */ case SIOCDELRT: /* Delete a route */ if (!capable(CAP_NET_ADMIN)) return -EPERM; |
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if (copy_from_user(&rt, arg, sizeof(rt))) |
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return -EFAULT; |
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|
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rtnl_lock(); |
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err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
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if (err == 0) { |
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struct fib_table *tb; |
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if (cmd == SIOCDELRT) { |
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tb = fib_get_table(net, cfg.fc_table); |
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if (tb) |
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err = fib_table_delete(tb, &cfg); |
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else err = -ESRCH; |
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} else { |
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tb = fib_new_table(net, cfg.fc_table); |
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if (tb) |
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err = fib_table_insert(tb, &cfg); |
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else err = -ENOBUFS; |
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} |
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/* allocated by rtentry_to_fib_config() */ kfree(cfg.fc_mx); |
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} rtnl_unlock(); return err; } return -EINVAL; } |
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const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
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[RTA_DST] = { .type = NLA_U32 }, [RTA_SRC] = { .type = NLA_U32 }, [RTA_IIF] = { .type = NLA_U32 }, [RTA_OIF] = { .type = NLA_U32 }, [RTA_GATEWAY] = { .type = NLA_U32 }, [RTA_PRIORITY] = { .type = NLA_U32 }, [RTA_PREFSRC] = { .type = NLA_U32 }, [RTA_METRICS] = { .type = NLA_NESTED }, |
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[RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
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[RTA_FLOW] = { .type = NLA_U32 }, |
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}; |
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static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
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468 |
struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4c
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469 |
{ |
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|
470 471 472 473 474 475 476 477 478 479 480 |
struct nlattr *attr; int err, remaining; struct rtmsg *rtm; err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); if (err < 0) goto errout; memset(cfg, 0, sizeof(*cfg)); rtm = nlmsg_data(nlh); |
4e902c574
|
481 |
cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c574
|
482 483 484 485 486 487 488 489 490 491 |
cfg->fc_tos = rtm->rtm_tos; cfg->fc_table = rtm->rtm_table; cfg->fc_protocol = rtm->rtm_protocol; cfg->fc_scope = rtm->rtm_scope; cfg->fc_type = rtm->rtm_type; cfg->fc_flags = rtm->rtm_flags; cfg->fc_nlflags = nlh->nlmsg_flags; cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4d
|
492 |
cfg->fc_nlinfo.nl_net = net; |
4e902c574
|
493 |
|
a0ee18b9b
|
494 495 496 497 |
if (cfg->fc_type > RTN_MAX) { err = -EINVAL; goto errout; } |
4e902c574
|
498 |
nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b0
|
499 |
switch (nla_type(attr)) { |
4e902c574
|
500 |
case RTA_DST: |
17fb2c643
|
501 |
cfg->fc_dst = nla_get_be32(attr); |
4e902c574
|
502 |
break; |
4e902c574
|
503 504 505 506 |
case RTA_OIF: cfg->fc_oif = nla_get_u32(attr); break; case RTA_GATEWAY: |
17fb2c643
|
507 |
cfg->fc_gw = nla_get_be32(attr); |
4e902c574
|
508 509 510 511 512 |
break; case RTA_PRIORITY: cfg->fc_priority = nla_get_u32(attr); break; case RTA_PREFSRC: |
17fb2c643
|
513 |
cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c574
|
514 515 516 517 518 519 520 521 522 523 524 525 |
break; case RTA_METRICS: cfg->fc_mx = nla_data(attr); cfg->fc_mx_len = nla_len(attr); break; case RTA_MULTIPATH: cfg->fc_mp = nla_data(attr); cfg->fc_mp_len = nla_len(attr); break; case RTA_FLOW: cfg->fc_flow = nla_get_u32(attr); break; |
4e902c574
|
526 527 528 |
case RTA_TABLE: cfg->fc_table = nla_get_u32(attr); break; |
1da177e4c
|
529 530 |
} } |
4e902c574
|
531 |
|
1da177e4c
|
532 |
return 0; |
4e902c574
|
533 534 |
errout: return err; |
1da177e4c
|
535 |
} |
6ed2533e5
|
536 |
static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4c
|
537 |
{ |
3b1e0a655
|
538 |
struct net *net = sock_net(skb->sk); |
4e902c574
|
539 540 541 |
struct fib_config cfg; struct fib_table *tb; int err; |
1da177e4c
|
542 |
|
4b5d47d4d
|
543 |
err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c574
|
544 545 |
if (err < 0) goto errout; |
1da177e4c
|
546 |
|
8ad4942cd
|
547 |
tb = fib_get_table(net, cfg.fc_table); |
4e902c574
|
548 549 550 551 |
if (tb == NULL) { err = -ESRCH; goto errout; } |
16c6cf8bb
|
552 |
err = fib_table_delete(tb, &cfg); |
4e902c574
|
553 554 |
errout: return err; |
1da177e4c
|
555 |
} |
6ed2533e5
|
556 |
static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4c
|
557 |
{ |
3b1e0a655
|
558 |
struct net *net = sock_net(skb->sk); |
4e902c574
|
559 560 561 |
struct fib_config cfg; struct fib_table *tb; int err; |
1da177e4c
|
562 |
|
4b5d47d4d
|
563 |
err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c574
|
564 565 |
if (err < 0) goto errout; |
1da177e4c
|
566 |
|
226b0b4a5
|
567 |
tb = fib_new_table(net, cfg.fc_table); |
4e902c574
|
568 569 570 571 |
if (tb == NULL) { err = -ENOBUFS; goto errout; } |
16c6cf8bb
|
572 |
err = fib_table_insert(tb, &cfg); |
4e902c574
|
573 574 |
errout: return err; |
1da177e4c
|
575 |
} |
63f3444fb
|
576 |
static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4c
|
577 |
{ |
3b1e0a655
|
578 |
struct net *net = sock_net(skb->sk); |
1af5a8c4a
|
579 580 |
unsigned int h, s_h; unsigned int e = 0, s_e; |
1da177e4c
|
581 |
struct fib_table *tb; |
1af5a8c4a
|
582 |
struct hlist_node *node; |
e4aef8aea
|
583 |
struct hlist_head *head; |
1af5a8c4a
|
584 |
int dumped = 0; |
1da177e4c
|
585 |
|
be403ea18
|
586 587 |
if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) |
1da177e4c
|
588 |
return ip_rt_dump(skb, cb); |
1af5a8c4a
|
589 590 591 592 593 |
s_h = cb->args[0]; s_e = cb->args[1]; for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { e = 0; |
e4aef8aea
|
594 595 |
head = &net->ipv4.fib_table_hash[h]; hlist_for_each_entry(tb, node, head, tb_hlist) { |
1af5a8c4a
|
596 597 598 599 |
if (e < s_e) goto next; if (dumped) memset(&cb->args[2], 0, sizeof(cb->args) - |
e905a9eda
|
600 |
2 * sizeof(cb->args[0])); |
16c6cf8bb
|
601 |
if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4a
|
602 603 604 605 606 |
goto out; dumped = 1; next: e++; } |
1da177e4c
|
607 |
} |
1af5a8c4a
|
608 609 610 |
out: cb->args[1] = e; cb->args[0] = h; |
1da177e4c
|
611 612 613 614 615 |
return skb->len; } /* Prepare and feed intra-kernel routing request. |
6a31d2a97
|
616 617 618 619 |
* Really, it should be netlink message, but :-( netlink * can be not configured, so that we feed it directly * to fib engine. It is legal, because all events occur * only when netlink is already locked. |
1da177e4c
|
620 |
*/ |
81f7bf6cb
|
621 |
static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4c
|
622 |
{ |
c346dca10
|
623 |
struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c574
|
624 625 626 627 628 629 630 631 632 |
struct fib_table *tb; struct fib_config cfg = { .fc_protocol = RTPROT_KERNEL, .fc_type = type, .fc_dst = dst, .fc_dst_len = dst_len, .fc_prefsrc = ifa->ifa_local, .fc_oif = ifa->ifa_dev->dev->ifindex, .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, |
4d1169c1e
|
633 |
.fc_nlinfo = { |
4b5d47d4d
|
634 |
.nl_net = net, |
4d1169c1e
|
635 |
}, |
4e902c574
|
636 |
}; |
1da177e4c
|
637 638 |
if (type == RTN_UNICAST) |
4b5d47d4d
|
639 |
tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4c
|
640 |
else |
4b5d47d4d
|
641 |
tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4c
|
642 643 644 |
if (tb == NULL) return; |
4e902c574
|
645 |
cfg.fc_table = tb->tb_id; |
1da177e4c
|
646 |
|
4e902c574
|
647 648 649 650 |
if (type != RTN_LOCAL) cfg.fc_scope = RT_SCOPE_LINK; else cfg.fc_scope = RT_SCOPE_HOST; |
1da177e4c
|
651 652 |
if (cmd == RTM_NEWROUTE) |
16c6cf8bb
|
653 |
fib_table_insert(tb, &cfg); |
1da177e4c
|
654 |
else |
16c6cf8bb
|
655 |
fib_table_delete(tb, &cfg); |
1da177e4c
|
656 |
} |
0ff60a456
|
657 |
void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4c
|
658 659 660 661 |
{ struct in_device *in_dev = ifa->ifa_dev; struct net_device *dev = in_dev->dev; struct in_ifaddr *prim = ifa; |
a144ea4b7
|
662 663 |
__be32 mask = ifa->ifa_mask; __be32 addr = ifa->ifa_local; |
6a31d2a97
|
664 |
__be32 prefix = ifa->ifa_address & mask; |
1da177e4c
|
665 |
|
6a31d2a97
|
666 |
if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4c
|
667 668 |
prim = inet_ifa_byprefix(in_dev, prefix, mask); if (prim == NULL) { |
a6db90109
|
669 670 |
printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL "); |
1da177e4c
|
671 672 673 674 675 |
return; } } fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); |
6a31d2a97
|
676 |
if (!(dev->flags & IFF_UP)) |
1da177e4c
|
677 678 679 |
return; /* Add broadcast address, if it is explicitly assigned. */ |
a144ea4b7
|
680 |
if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4c
|
681 |
fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
6a31d2a97
|
682 |
if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4c
|
683 |
(prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a97
|
684 685 686 |
fib_magic(RTM_NEWROUTE, dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); |
1da177e4c
|
687 688 689 690 |
/* Add network specific broadcasts, when it takes a sense */ if (ifa->ifa_prefixlen < 31) { fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); |
6a31d2a97
|
691 692 |
fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, 32, prim); |
1da177e4c
|
693 694 695 696 697 698 699 700 701 702 |
} } } static void fib_del_ifaddr(struct in_ifaddr *ifa) { struct in_device *in_dev = ifa->ifa_dev; struct net_device *dev = in_dev->dev; struct in_ifaddr *ifa1; struct in_ifaddr *prim = ifa; |
6a31d2a97
|
703 704 |
__be32 brd = ifa->ifa_address | ~ifa->ifa_mask; __be32 any = ifa->ifa_address & ifa->ifa_mask; |
1da177e4c
|
705 706 707 708 709 |
#define LOCAL_OK 1 #define BRD_OK 2 #define BRD0_OK 4 #define BRD1_OK 8 unsigned ok = 0; |
6a31d2a97
|
710 711 712 713 |
if (!(ifa->ifa_flags & IFA_F_SECONDARY)) fib_magic(RTM_DELROUTE, dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, any, ifa->ifa_prefixlen, prim); |
1da177e4c
|
714 715 716 |
else { prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); if (prim == NULL) { |
a6db90109
|
717 718 |
printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL "); |
1da177e4c
|
719 720 721 722 723 |
return; } } /* Deletion is more complicated than add. |
6a31d2a97
|
724 725 726 |
* We should take care of not to delete too much :-) * * Scan address list to be sure that addresses are really gone. |
1da177e4c
|
727 728 729 730 731 732 733 734 735 736 737 738 |
*/ for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { if (ifa->ifa_local == ifa1->ifa_local) ok |= LOCAL_OK; if (ifa->ifa_broadcast == ifa1->ifa_broadcast) ok |= BRD_OK; if (brd == ifa1->ifa_broadcast) ok |= BRD1_OK; if (any == ifa1->ifa_broadcast) ok |= BRD0_OK; } |
6a31d2a97
|
739 |
if (!(ok & BRD_OK)) |
1da177e4c
|
740 |
fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
6a31d2a97
|
741 |
if (!(ok & BRD1_OK)) |
1da177e4c
|
742 |
fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); |
6a31d2a97
|
743 |
if (!(ok & BRD0_OK)) |
1da177e4c
|
744 |
fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); |
6a31d2a97
|
745 |
if (!(ok & LOCAL_OK)) { |
1da177e4c
|
746 747 748 |
fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); /* Check, that this local address finally disappeared. */ |
c346dca10
|
749 |
if (inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { |
1da177e4c
|
750 |
/* And the last, but not the least thing. |
6a31d2a97
|
751 752 753 754 755 |
* We must flush stray FIB entries. * * First of all, we scan fib_info list searching * for stray nexthop entries, then ignite fib_flush. */ |
c346dca10
|
756 757 |
if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) fib_flush(dev_net(dev)); |
1da177e4c
|
758 759 760 761 762 763 764 |
} } #undef LOCAL_OK #undef BRD_OK #undef BRD0_OK #undef BRD1_OK } |
6a31d2a97
|
765 |
static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb) |
246955fe4
|
766 |
{ |
e905a9eda
|
767 |
|
246955fe4
|
768 |
struct fib_result res; |
9ade22861
|
769 770 771 772 773 |
struct flowi4 fl4 = { .flowi4_mark = frn->fl_mark, .daddr = frn->fl_addr, .flowi4_tos = frn->fl_tos, .flowi4_scope = frn->fl_scope, |
6a31d2a97
|
774 |
}; |
1194ed0a3
|
775 |
|
912a41a4a
|
776 777 778 |
#ifdef CONFIG_IP_MULTIPLE_TABLES res.r = NULL; #endif |
1194ed0a3
|
779 |
frn->err = -ENOENT; |
246955fe4
|
780 781 782 783 |
if (tb) { local_bh_disable(); frn->tb_id = tb->tb_id; |
ebc0ffae5
|
784 |
rcu_read_lock(); |
9ade22861
|
785 |
frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe4
|
786 787 788 789 790 791 792 |
if (!frn->err) { frn->prefixlen = res.prefixlen; frn->nh_sel = res.nh_sel; frn->type = res.type; frn->scope = res.scope; } |
ebc0ffae5
|
793 |
rcu_read_unlock(); |
246955fe4
|
794 795 796 |
local_bh_enable(); } } |
28f7b0360
|
797 |
static void nl_fib_input(struct sk_buff *skb) |
246955fe4
|
798 |
{ |
6bd48fcf7
|
799 |
struct net *net; |
246955fe4
|
800 |
struct fib_result_nl *frn; |
28f7b0360
|
801 |
struct nlmsghdr *nlh; |
246955fe4
|
802 |
struct fib_table *tb; |
28f7b0360
|
803 |
u32 pid; |
1194ed0a3
|
804 |
|
3b1e0a655
|
805 |
net = sock_net(skb->sk); |
b529ccf27
|
806 |
nlh = nlmsg_hdr(skb); |
ea86575ea
|
807 |
if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a0367
|
808 |
nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575ea
|
809 |
return; |
d883a0367
|
810 811 812 813 814 |
skb = skb_clone(skb, GFP_KERNEL); if (skb == NULL) return; nlh = nlmsg_hdr(skb); |
e905a9eda
|
815 |
|
246955fe4
|
816 |
frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
6bd48fcf7
|
817 |
tb = fib_get_table(net, frn->tb_id_in); |
246955fe4
|
818 819 |
nl_fib_lookup(frn, tb); |
e905a9eda
|
820 |
|
6a31d2a97
|
821 822 |
pid = NETLINK_CB(skb).pid; /* pid of sending process */ NETLINK_CB(skb).pid = 0; /* from kernel */ |
ac6d439d2
|
823 |
NETLINK_CB(skb).dst_group = 0; /* unicast */ |
6bd48fcf7
|
824 |
netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); |
e905a9eda
|
825 |
} |
246955fe4
|
826 |
|
2c8c1e729
|
827 |
static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe4
|
828 |
{ |
6bd48fcf7
|
829 830 831 832 |
struct sock *sk; sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, nl_fib_input, NULL, THIS_MODULE); if (sk == NULL) |
7b1a74fdb
|
833 |
return -EAFNOSUPPORT; |
6bd48fcf7
|
834 |
net->ipv4.fibnl = sk; |
7b1a74fdb
|
835 836 837 838 839 |
return 0; } static void nl_fib_lookup_exit(struct net *net) { |
b7c6ba6eb
|
840 |
netlink_kernel_release(net->ipv4.fibnl); |
775516bfa
|
841 |
net->ipv4.fibnl = NULL; |
246955fe4
|
842 |
} |
e2ce14684
|
843 |
static void fib_disable_ip(struct net_device *dev, int force, int delay) |
1da177e4c
|
844 |
{ |
85326fa54
|
845 |
if (fib_sync_down_dev(dev, force)) |
c346dca10
|
846 |
fib_flush(dev_net(dev)); |
e2ce14684
|
847 |
rt_cache_flush(dev_net(dev), delay); |
1da177e4c
|
848 849 850 851 852 |
arp_ifdown(dev); } static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) { |
6ed2533e5
|
853 |
struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb4
|
854 |
struct net_device *dev = ifa->ifa_dev->dev; |
1da177e4c
|
855 856 857 858 859 |
switch (event) { case NETDEV_UP: fib_add_ifaddr(ifa); #ifdef CONFIG_IP_ROUTE_MULTIPATH |
76e6ebfb4
|
860 |
fib_sync_up(dev); |
1da177e4c
|
861 |
#endif |
1fc050a13
|
862 |
fib_update_nh_saddrs(dev); |
76e6ebfb4
|
863 |
rt_cache_flush(dev_net(dev), -1); |
1da177e4c
|
864 865 866 |
break; case NETDEV_DOWN: fib_del_ifaddr(ifa); |
1fc050a13
|
867 |
fib_update_nh_saddrs(dev); |
9fcc2e8a7
|
868 |
if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4c
|
869 |
/* Last address was deleted from this interface. |
6a31d2a97
|
870 |
* Disable IP. |
1da177e4c
|
871 |
*/ |
e2ce14684
|
872 |
fib_disable_ip(dev, 1, 0); |
1da177e4c
|
873 |
} else { |
76e6ebfb4
|
874 |
rt_cache_flush(dev_net(dev), -1); |
1da177e4c
|
875 876 877 878 879 880 881 882 883 |
} break; } return NOTIFY_DONE; } static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) { struct net_device *dev = ptr; |
e5ed63991
|
884 |
struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4c
|
885 886 |
if (event == NETDEV_UNREGISTER) { |
e2ce14684
|
887 |
fib_disable_ip(dev, 2, -1); |
1da177e4c
|
888 889 890 891 892 893 894 895 896 897 898 899 900 901 |
return NOTIFY_DONE; } if (!in_dev) return NOTIFY_DONE; switch (event) { case NETDEV_UP: for_ifa(in_dev) { fib_add_ifaddr(ifa); } endfor_ifa(in_dev); #ifdef CONFIG_IP_ROUTE_MULTIPATH fib_sync_up(dev); #endif |
76e6ebfb4
|
902 |
rt_cache_flush(dev_net(dev), -1); |
1da177e4c
|
903 904 |
break; case NETDEV_DOWN: |
e2ce14684
|
905 |
fib_disable_ip(dev, 0, 0); |
1da177e4c
|
906 907 908 |
break; case NETDEV_CHANGEMTU: case NETDEV_CHANGE: |
76e6ebfb4
|
909 |
rt_cache_flush(dev_net(dev), 0); |
1da177e4c
|
910 |
break; |
a5ee15513
|
911 |
case NETDEV_UNREGISTER_BATCH: |
6561a3b12
|
912 913 914 915 916 |
/* The batch unregister is only called on the first * device in the list of devices being unregistered. * Therefore we should not pass dev_net(dev) in here. */ rt_cache_flush_batch(NULL); |
a5ee15513
|
917 |
break; |
1da177e4c
|
918 919 920 921 922 |
} return NOTIFY_DONE; } static struct notifier_block fib_inetaddr_notifier = { |
6ed2533e5
|
923 |
.notifier_call = fib_inetaddr_event, |
1da177e4c
|
924 925 926 |
}; static struct notifier_block fib_netdev_notifier = { |
6ed2533e5
|
927 |
.notifier_call = fib_netdev_event, |
1da177e4c
|
928 |
}; |
7b1a74fdb
|
929 |
static int __net_init ip_fib_net_init(struct net *net) |
1da177e4c
|
930 |
{ |
dce5cbeec
|
931 |
int err; |
10da66f75
|
932 933 934 935 |
size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; /* Avoid false sharing : Use at least a full cache line */ size = max_t(size_t, size, L1_CACHE_BYTES); |
1af5a8c4a
|
936 |
|
10da66f75
|
937 |
net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
e4aef8aea
|
938 939 |
if (net->ipv4.fib_table_hash == NULL) return -ENOMEM; |
dce5cbeec
|
940 941 942 943 944 945 946 947 |
err = fib4_rules_init(net); if (err < 0) goto fail; return 0; fail: kfree(net->ipv4.fib_table_hash); return err; |
7b1a74fdb
|
948 |
} |
1da177e4c
|
949 |
|
2c8c1e729
|
950 |
static void ip_fib_net_exit(struct net *net) |
7b1a74fdb
|
951 952 953 954 955 956 957 958 959 960 961 |
{ unsigned int i; #ifdef CONFIG_IP_MULTIPLE_TABLES fib4_rules_exit(net); #endif for (i = 0; i < FIB_TABLE_HASHSZ; i++) { struct fib_table *tb; struct hlist_head *head; struct hlist_node *node, *tmp; |
63f3444fb
|
962 |
|
e4aef8aea
|
963 |
head = &net->ipv4.fib_table_hash[i]; |
7b1a74fdb
|
964 965 |
hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { hlist_del(node); |
16c6cf8bb
|
966 |
fib_table_flush(tb); |
4aa2c466a
|
967 |
fib_free_table(tb); |
7b1a74fdb
|
968 969 |
} } |
e4aef8aea
|
970 |
kfree(net->ipv4.fib_table_hash); |
7b1a74fdb
|
971 972 973 974 975 |
} static int __net_init fib_net_init(struct net *net) { int error; |
7b1a74fdb
|
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 |
error = ip_fib_net_init(net); if (error < 0) goto out; error = nl_fib_lookup_init(net); if (error < 0) goto out_nlfl; error = fib_proc_init(net); if (error < 0) goto out_proc; out: return error; out_proc: nl_fib_lookup_exit(net); out_nlfl: ip_fib_net_exit(net); goto out; } static void __net_exit fib_net_exit(struct net *net) { fib_proc_exit(net); nl_fib_lookup_exit(net); ip_fib_net_exit(net); } static struct pernet_operations fib_net_ops = { .init = fib_net_init, .exit = fib_net_exit, }; void __init ip_fib_init(void) { |
63f3444fb
|
1009 1010 1011 |
rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); |
7b1a74fdb
|
1012 1013 1014 1015 |
register_pernet_subsys(&fib_net_ops); register_netdevice_notifier(&fib_netdev_notifier); register_inetaddr_notifier(&fib_inetaddr_notifier); |
7f9b80529
|
1016 |
|
5348ba85a
|
1017 |
fib_trie_init(); |
1da177e4c
|
1018 |
} |