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net/ipv4/fib_frontend.c
27.3 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> |
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#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/cache.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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#include <net/xfrm.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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switch (id) { case RT_TABLE_LOCAL: net->ipv4.fib_local = tb; break; case RT_TABLE_MAIN: net->ipv4.fib_main = tb; break; case RT_TABLE_DEFAULT: net->ipv4.fib_default = tb; break; default: break; } |
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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; |
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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]; |
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hlist_for_each_entry_rcu(tb, 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_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]; |
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hlist_for_each_entry(tb, 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); |
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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 int __inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr) |
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{ |
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struct flowi4 fl4 = { .daddr = addr }; |
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struct fib_result res; |
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unsigned int 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; |
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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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__be32 fib_compute_spec_dst(struct sk_buff *skb) { struct net_device *dev = skb->dev; struct in_device *in_dev; struct fib_result res; |
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struct rtable *rt; |
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struct flowi4 fl4; struct net *net; |
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int scope; |
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rt = skb_rtable(skb); |
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if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == RTCF_LOCAL) |
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return ip_hdr(skb)->daddr; in_dev = __in_dev_get_rcu(dev); BUG_ON(!in_dev); |
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net = dev_net(dev); |
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scope = RT_SCOPE_UNIVERSE; if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { fl4.flowi4_oif = 0; |
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fl4.flowi4_iif = LOOPBACK_IFINDEX; |
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fl4.daddr = ip_hdr(skb)->saddr; fl4.saddr = 0; fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); fl4.flowi4_scope = scope; fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; if (!fib_lookup(net, &fl4, &res)) return FIB_RES_PREFSRC(net, res); } else { scope = RT_SCOPE_LINK; } return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); |
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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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static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, u8 tos, int oif, struct net_device *dev, int rpf, struct in_device *idev, u32 *itag) |
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{ |
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int ret, no_addr; |
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struct fib_result res; |
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struct flowi4 fl4; |
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struct net *net; |
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bool dev_match; |
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fl4.flowi4_oif = 0; |
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fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; |
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fl4.daddr = src; fl4.saddr = dst; fl4.flowi4_tos = tos; fl4.flowi4_scope = RT_SCOPE_UNIVERSE; |
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no_addr = idev->ifa_list == NULL; |
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fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
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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 && (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) goto e_inval; if (!rpf && !fib_num_tclassid_users(dev_net(dev)) && (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) goto last_resort; |
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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) |
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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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*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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/* Ignore rp_filter for packets protected by IPsec. */ int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, u8 tos, int oif, struct net_device *dev, struct in_device *idev, u32 *itag) { int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); |
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if (!r && !fib_num_tclassid_users(dev_net(dev)) && |
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IN_DEV_ACCEPT_LOCAL(idev) && |
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(dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
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*itag = 0; return 0; } return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); } |
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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 */ |
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if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
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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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|
479 |
err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4c
|
480 |
if (err == 0) { |
4e902c574
|
481 |
struct fib_table *tb; |
1da177e4c
|
482 |
if (cmd == SIOCDELRT) { |
1bad118a3
|
483 |
tb = fib_get_table(net, cfg.fc_table); |
1da177e4c
|
484 |
if (tb) |
16c6cf8bb
|
485 |
err = fib_table_delete(tb, &cfg); |
4e902c574
|
486 487 |
else err = -ESRCH; |
1da177e4c
|
488 |
} else { |
1bad118a3
|
489 |
tb = fib_new_table(net, cfg.fc_table); |
1da177e4c
|
490 |
if (tb) |
16c6cf8bb
|
491 |
err = fib_table_insert(tb, &cfg); |
4e902c574
|
492 493 |
else err = -ENOBUFS; |
1da177e4c
|
494 |
} |
4e902c574
|
495 496 497 |
/* allocated by rtentry_to_fib_config() */ kfree(cfg.fc_mx); |
1da177e4c
|
498 499 500 501 502 503 |
} rtnl_unlock(); return err; } return -EINVAL; } |
6a31d2a97
|
504 |
const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c574
|
505 506 507 508 509 510 511 512 |
[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 }, |
5176f91ea
|
513 |
[RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c574
|
514 |
[RTA_FLOW] = { .type = NLA_U32 }, |
4e902c574
|
515 |
}; |
4b5d47d4d
|
516 |
static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a97
|
517 |
struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4c
|
518 |
{ |
4e902c574
|
519 520 521 522 523 524 525 526 527 528 529 |
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
|
530 |
cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c574
|
531 532 533 534 535 536 537 |
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; |
15e473046
|
538 |
cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c574
|
539 |
cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4d
|
540 |
cfg->fc_nlinfo.nl_net = net; |
4e902c574
|
541 |
|
a0ee18b9b
|
542 543 544 545 |
if (cfg->fc_type > RTN_MAX) { err = -EINVAL; goto errout; } |
4e902c574
|
546 |
nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b0
|
547 |
switch (nla_type(attr)) { |
4e902c574
|
548 |
case RTA_DST: |
17fb2c643
|
549 |
cfg->fc_dst = nla_get_be32(attr); |
4e902c574
|
550 |
break; |
4e902c574
|
551 552 553 554 |
case RTA_OIF: cfg->fc_oif = nla_get_u32(attr); break; case RTA_GATEWAY: |
17fb2c643
|
555 |
cfg->fc_gw = nla_get_be32(attr); |
4e902c574
|
556 557 558 559 560 |
break; case RTA_PRIORITY: cfg->fc_priority = nla_get_u32(attr); break; case RTA_PREFSRC: |
17fb2c643
|
561 |
cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c574
|
562 563 564 565 566 567 568 569 570 571 572 573 |
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
|
574 575 576 |
case RTA_TABLE: cfg->fc_table = nla_get_u32(attr); break; |
1da177e4c
|
577 578 |
} } |
4e902c574
|
579 |
|
1da177e4c
|
580 |
return 0; |
4e902c574
|
581 582 |
errout: return err; |
1da177e4c
|
583 |
} |
661d2967b
|
584 |
static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4c
|
585 |
{ |
3b1e0a655
|
586 |
struct net *net = sock_net(skb->sk); |
4e902c574
|
587 588 589 |
struct fib_config cfg; struct fib_table *tb; int err; |
1da177e4c
|
590 |
|
4b5d47d4d
|
591 |
err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c574
|
592 593 |
if (err < 0) goto errout; |
1da177e4c
|
594 |
|
8ad4942cd
|
595 |
tb = fib_get_table(net, cfg.fc_table); |
4e902c574
|
596 597 598 599 |
if (tb == NULL) { err = -ESRCH; goto errout; } |
16c6cf8bb
|
600 |
err = fib_table_delete(tb, &cfg); |
4e902c574
|
601 602 |
errout: return err; |
1da177e4c
|
603 |
} |
661d2967b
|
604 |
static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4c
|
605 |
{ |
3b1e0a655
|
606 |
struct net *net = sock_net(skb->sk); |
4e902c574
|
607 608 609 |
struct fib_config cfg; struct fib_table *tb; int err; |
1da177e4c
|
610 |
|
4b5d47d4d
|
611 |
err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c574
|
612 613 |
if (err < 0) goto errout; |
1da177e4c
|
614 |
|
226b0b4a5
|
615 |
tb = fib_new_table(net, cfg.fc_table); |
4e902c574
|
616 617 618 619 |
if (tb == NULL) { err = -ENOBUFS; goto errout; } |
16c6cf8bb
|
620 |
err = fib_table_insert(tb, &cfg); |
4e902c574
|
621 622 |
errout: return err; |
1da177e4c
|
623 |
} |
63f3444fb
|
624 |
static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4c
|
625 |
{ |
3b1e0a655
|
626 |
struct net *net = sock_net(skb->sk); |
1af5a8c4a
|
627 628 |
unsigned int h, s_h; unsigned int e = 0, s_e; |
1da177e4c
|
629 |
struct fib_table *tb; |
e4aef8aea
|
630 |
struct hlist_head *head; |
1af5a8c4a
|
631 |
int dumped = 0; |
1da177e4c
|
632 |
|
be403ea18
|
633 634 |
if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) |
0b8c7f6f2
|
635 |
return skb->len; |
1da177e4c
|
636 |
|
1af5a8c4a
|
637 638 639 640 641 |
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
|
642 |
head = &net->ipv4.fib_table_hash[h]; |
b67bfe0d4
|
643 |
hlist_for_each_entry(tb, head, tb_hlist) { |
1af5a8c4a
|
644 645 646 647 |
if (e < s_e) goto next; if (dumped) memset(&cb->args[2], 0, sizeof(cb->args) - |
e905a9eda
|
648 |
2 * sizeof(cb->args[0])); |
16c6cf8bb
|
649 |
if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4a
|
650 651 652 653 654 |
goto out; dumped = 1; next: e++; } |
1da177e4c
|
655 |
} |
1af5a8c4a
|
656 657 658 |
out: cb->args[1] = e; cb->args[0] = h; |
1da177e4c
|
659 660 661 662 663 |
return skb->len; } /* Prepare and feed intra-kernel routing request. |
6a31d2a97
|
664 665 666 667 |
* 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
|
668 |
*/ |
81f7bf6cb
|
669 |
static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4c
|
670 |
{ |
c346dca10
|
671 |
struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c574
|
672 673 674 675 676 677 678 679 680 |
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
|
681 |
.fc_nlinfo = { |
4b5d47d4d
|
682 |
.nl_net = net, |
4d1169c1e
|
683 |
}, |
4e902c574
|
684 |
}; |
1da177e4c
|
685 686 |
if (type == RTN_UNICAST) |
4b5d47d4d
|
687 |
tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4c
|
688 |
else |
4b5d47d4d
|
689 |
tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4c
|
690 691 692 |
if (tb == NULL) return; |
4e902c574
|
693 |
cfg.fc_table = tb->tb_id; |
1da177e4c
|
694 |
|
4e902c574
|
695 696 697 698 |
if (type != RTN_LOCAL) cfg.fc_scope = RT_SCOPE_LINK; else cfg.fc_scope = RT_SCOPE_HOST; |
1da177e4c
|
699 700 |
if (cmd == RTM_NEWROUTE) |
16c6cf8bb
|
701 |
fib_table_insert(tb, &cfg); |
1da177e4c
|
702 |
else |
16c6cf8bb
|
703 |
fib_table_delete(tb, &cfg); |
1da177e4c
|
704 |
} |
0ff60a456
|
705 |
void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4c
|
706 707 708 709 |
{ struct in_device *in_dev = ifa->ifa_dev; struct net_device *dev = in_dev->dev; struct in_ifaddr *prim = ifa; |
a144ea4b7
|
710 711 |
__be32 mask = ifa->ifa_mask; __be32 addr = ifa->ifa_local; |
6a31d2a97
|
712 |
__be32 prefix = ifa->ifa_address & mask; |
1da177e4c
|
713 |
|
6a31d2a97
|
714 |
if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4c
|
715 716 |
prim = inet_ifa_byprefix(in_dev, prefix, mask); if (prim == NULL) { |
058bd4d2a
|
717 718 |
pr_warn("%s: bug: prim == NULL ", __func__); |
1da177e4c
|
719 720 721 722 723 |
return; } } fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); |
6a31d2a97
|
724 |
if (!(dev->flags & IFF_UP)) |
1da177e4c
|
725 726 727 |
return; /* Add broadcast address, if it is explicitly assigned. */ |
a144ea4b7
|
728 |
if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4c
|
729 |
fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
6a31d2a97
|
730 |
if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4c
|
731 |
(prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a97
|
732 733 734 |
fib_magic(RTM_NEWROUTE, dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); |
1da177e4c
|
735 736 737 738 |
/* Add network specific broadcasts, when it takes a sense */ if (ifa->ifa_prefixlen < 31) { fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); |
6a31d2a97
|
739 740 |
fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, 32, prim); |
1da177e4c
|
741 742 743 |
} } } |
e6abbaa27
|
744 745 746 747 748 749 |
/* Delete primary or secondary address. * Optionally, on secondary address promotion consider the addresses * from subnet iprim as deleted, even if they are in device list. * In this case the secondary ifa can be in device list. */ void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) |
1da177e4c
|
750 751 752 753 |
{ struct in_device *in_dev = ifa->ifa_dev; struct net_device *dev = in_dev->dev; struct in_ifaddr *ifa1; |
e6abbaa27
|
754 |
struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a97
|
755 756 |
__be32 brd = ifa->ifa_address | ~ifa->ifa_mask; __be32 any = ifa->ifa_address & ifa->ifa_mask; |
1da177e4c
|
757 758 759 760 |
#define LOCAL_OK 1 #define BRD_OK 2 #define BRD0_OK 4 #define BRD1_OK 8 |
95c961747
|
761 |
unsigned int ok = 0; |
e6abbaa27
|
762 763 764 |
int subnet = 0; /* Primary network */ int gone = 1; /* Address is missing */ int same_prefsrc = 0; /* Another primary with same IP */ |
1da177e4c
|
765 |
|
e6abbaa27
|
766 |
if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4c
|
767 768 |
prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); if (prim == NULL) { |
058bd4d2a
|
769 770 |
pr_warn("%s: bug: prim == NULL ", __func__); |
1da177e4c
|
771 772 |
return; } |
e6abbaa27
|
773 |
if (iprim && iprim != prim) { |
058bd4d2a
|
774 775 |
pr_warn("%s: bug: iprim != prim ", __func__); |
e6abbaa27
|
776 777 778 779 780 781 782 783 |
return; } } else if (!ipv4_is_zeronet(any) && (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { fib_magic(RTM_DELROUTE, dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, any, ifa->ifa_prefixlen, prim); subnet = 1; |
1da177e4c
|
784 785 786 |
} /* Deletion is more complicated than add. |
6a31d2a97
|
787 788 789 |
* We should take care of not to delete too much :-) * * Scan address list to be sure that addresses are really gone. |
1da177e4c
|
790 791 792 |
*/ for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { |
e6abbaa27
|
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 |
if (ifa1 == ifa) { /* promotion, keep the IP */ gone = 0; continue; } /* Ignore IFAs from our subnet */ if (iprim && ifa1->ifa_mask == iprim->ifa_mask && inet_ifa_match(ifa1->ifa_address, iprim)) continue; /* Ignore ifa1 if it uses different primary IP (prefsrc) */ if (ifa1->ifa_flags & IFA_F_SECONDARY) { /* Another address from our subnet? */ if (ifa1->ifa_mask == prim->ifa_mask && inet_ifa_match(ifa1->ifa_address, prim)) prim1 = prim; else { /* We reached the secondaries, so * same_prefsrc should be determined. */ if (!same_prefsrc) continue; /* Search new prim1 if ifa1 is not * using the current prim1 */ if (!prim1 || ifa1->ifa_mask != prim1->ifa_mask || !inet_ifa_match(ifa1->ifa_address, prim1)) prim1 = inet_ifa_byprefix(in_dev, ifa1->ifa_address, ifa1->ifa_mask); if (!prim1) continue; if (prim1->ifa_local != prim->ifa_local) continue; } } else { if (prim->ifa_local != ifa1->ifa_local) continue; prim1 = ifa1; if (prim != prim1) same_prefsrc = 1; } |
1da177e4c
|
836 837 838 839 840 841 842 843 |
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; |
e6abbaa27
|
844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 |
/* primary has network specific broadcasts */ if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; if (!ipv4_is_zeronet(any1)) { if (ifa->ifa_broadcast == brd1 || ifa->ifa_broadcast == any1) ok |= BRD_OK; if (brd == brd1 || brd == any1) ok |= BRD1_OK; if (any == brd1 || any == any1) ok |= BRD0_OK; } } |
1da177e4c
|
859 |
} |
6a31d2a97
|
860 |
if (!(ok & BRD_OK)) |
1da177e4c
|
861 |
fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa27
|
862 863 864 865 866 867 |
if (subnet && ifa->ifa_prefixlen < 31) { if (!(ok & BRD1_OK)) fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); if (!(ok & BRD0_OK)) fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); } |
6a31d2a97
|
868 |
if (!(ok & LOCAL_OK)) { |
1da177e4c
|
869 870 871 |
fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); /* Check, that this local address finally disappeared. */ |
e6abbaa27
|
872 873 |
if (gone && inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { |
1da177e4c
|
874 |
/* And the last, but not the least thing. |
6a31d2a97
|
875 876 877 878 879 |
* We must flush stray FIB entries. * * First of all, we scan fib_info list searching * for stray nexthop entries, then ignite fib_flush. */ |
c346dca10
|
880 881 |
if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) fib_flush(dev_net(dev)); |
1da177e4c
|
882 883 884 885 886 887 888 |
} } #undef LOCAL_OK #undef BRD_OK #undef BRD0_OK #undef BRD1_OK } |
6a31d2a97
|
889 |
static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb) |
246955fe4
|
890 |
{ |
e905a9eda
|
891 |
|
246955fe4
|
892 |
struct fib_result res; |
9ade22861
|
893 894 895 896 897 |
struct flowi4 fl4 = { .flowi4_mark = frn->fl_mark, .daddr = frn->fl_addr, .flowi4_tos = frn->fl_tos, .flowi4_scope = frn->fl_scope, |
6a31d2a97
|
898 |
}; |
1194ed0a3
|
899 900 |
frn->err = -ENOENT; |
246955fe4
|
901 902 903 904 |
if (tb) { local_bh_disable(); frn->tb_id = tb->tb_id; |
9ade22861
|
905 |
frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe4
|
906 907 908 909 910 911 912 913 914 915 |
if (!frn->err) { frn->prefixlen = res.prefixlen; frn->nh_sel = res.nh_sel; frn->type = res.type; frn->scope = res.scope; } local_bh_enable(); } } |
28f7b0360
|
916 |
static void nl_fib_input(struct sk_buff *skb) |
246955fe4
|
917 |
{ |
6bd48fcf7
|
918 |
struct net *net; |
246955fe4
|
919 |
struct fib_result_nl *frn; |
28f7b0360
|
920 |
struct nlmsghdr *nlh; |
246955fe4
|
921 |
struct fib_table *tb; |
15e473046
|
922 |
u32 portid; |
1194ed0a3
|
923 |
|
3b1e0a655
|
924 |
net = sock_net(skb->sk); |
b529ccf27
|
925 |
nlh = nlmsg_hdr(skb); |
573ce260b
|
926 927 |
if (skb->len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len || nlmsg_len(nlh) < sizeof(*frn)) |
ea86575ea
|
928 |
return; |
d883a0367
|
929 |
|
3a36515f7
|
930 |
skb = netlink_skb_clone(skb, GFP_KERNEL); |
d883a0367
|
931 932 933 |
if (skb == NULL) return; nlh = nlmsg_hdr(skb); |
e905a9eda
|
934 |
|
573ce260b
|
935 |
frn = (struct fib_result_nl *) nlmsg_data(nlh); |
6bd48fcf7
|
936 |
tb = fib_get_table(net, frn->tb_id_in); |
246955fe4
|
937 938 |
nl_fib_lookup(frn, tb); |
e905a9eda
|
939 |
|
28a28283f
|
940 |
portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e473046
|
941 |
NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d2
|
942 |
NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e473046
|
943 |
netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9eda
|
944 |
} |
246955fe4
|
945 |
|
2c8c1e729
|
946 |
static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe4
|
947 |
{ |
6bd48fcf7
|
948 |
struct sock *sk; |
a31f2d17b
|
949 950 951 |
struct netlink_kernel_cfg cfg = { .input = nl_fib_input, }; |
9f00d9776
|
952 |
sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
6bd48fcf7
|
953 |
if (sk == NULL) |
7b1a74fdb
|
954 |
return -EAFNOSUPPORT; |
6bd48fcf7
|
955 |
net->ipv4.fibnl = sk; |
7b1a74fdb
|
956 957 958 959 960 |
return 0; } static void nl_fib_lookup_exit(struct net *net) { |
b7c6ba6eb
|
961 |
netlink_kernel_release(net->ipv4.fibnl); |
775516bfa
|
962 |
net->ipv4.fibnl = NULL; |
246955fe4
|
963 |
} |
4ccfe6d41
|
964 |
static void fib_disable_ip(struct net_device *dev, int force) |
1da177e4c
|
965 |
{ |
85326fa54
|
966 |
if (fib_sync_down_dev(dev, force)) |
c346dca10
|
967 |
fib_flush(dev_net(dev)); |
4ccfe6d41
|
968 |
rt_cache_flush(dev_net(dev)); |
1da177e4c
|
969 970 971 972 973 |
arp_ifdown(dev); } static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) { |
6ed2533e5
|
974 |
struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb4
|
975 |
struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66e
|
976 |
struct net *net = dev_net(dev); |
1da177e4c
|
977 978 979 980 981 |
switch (event) { case NETDEV_UP: fib_add_ifaddr(ifa); #ifdef CONFIG_IP_ROUTE_MULTIPATH |
76e6ebfb4
|
982 |
fib_sync_up(dev); |
1da177e4c
|
983 |
#endif |
436c3b66e
|
984 |
atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d41
|
985 |
rt_cache_flush(dev_net(dev)); |
1da177e4c
|
986 987 |
break; case NETDEV_DOWN: |
e6abbaa27
|
988 |
fib_del_ifaddr(ifa, NULL); |
436c3b66e
|
989 |
atomic_inc(&net->ipv4.dev_addr_genid); |
9fcc2e8a7
|
990 |
if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4c
|
991 |
/* Last address was deleted from this interface. |
6a31d2a97
|
992 |
* Disable IP. |
1da177e4c
|
993 |
*/ |
4ccfe6d41
|
994 |
fib_disable_ip(dev, 1); |
1da177e4c
|
995 |
} else { |
4ccfe6d41
|
996 |
rt_cache_flush(dev_net(dev)); |
1da177e4c
|
997 998 999 1000 1001 1002 1003 1004 |
} break; } return NOTIFY_DONE; } static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) { |
351638e7d
|
1005 |
struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
0115e8e30
|
1006 |
struct in_device *in_dev; |
436c3b66e
|
1007 |
struct net *net = dev_net(dev); |
1da177e4c
|
1008 1009 |
if (event == NETDEV_UNREGISTER) { |
4ccfe6d41
|
1010 |
fib_disable_ip(dev, 2); |
caacf05e5
|
1011 |
rt_flush_dev(dev); |
1da177e4c
|
1012 1013 |
return NOTIFY_DONE; } |
0115e8e30
|
1014 |
in_dev = __in_dev_get_rtnl(dev); |
a0065f266
|
1015 1016 |
if (!in_dev) return NOTIFY_DONE; |
0115e8e30
|
1017 |
|
1da177e4c
|
1018 1019 1020 1021 1022 1023 1024 1025 |
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 |
436c3b66e
|
1026 |
atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d41
|
1027 |
rt_cache_flush(net); |
1da177e4c
|
1028 1029 |
break; case NETDEV_DOWN: |
4ccfe6d41
|
1030 |
fib_disable_ip(dev, 0); |
1da177e4c
|
1031 1032 1033 |
break; case NETDEV_CHANGEMTU: case NETDEV_CHANGE: |
4ccfe6d41
|
1034 |
rt_cache_flush(net); |
1da177e4c
|
1035 1036 1037 1038 1039 1040 |
break; } return NOTIFY_DONE; } static struct notifier_block fib_inetaddr_notifier = { |
6ed2533e5
|
1041 |
.notifier_call = fib_inetaddr_event, |
1da177e4c
|
1042 1043 1044 |
}; static struct notifier_block fib_netdev_notifier = { |
6ed2533e5
|
1045 |
.notifier_call = fib_netdev_event, |
1da177e4c
|
1046 |
}; |
7b1a74fdb
|
1047 |
static int __net_init ip_fib_net_init(struct net *net) |
1da177e4c
|
1048 |
{ |
dce5cbeec
|
1049 |
int err; |
10da66f75
|
1050 1051 1052 1053 |
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
|
1054 |
|
10da66f75
|
1055 |
net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
e4aef8aea
|
1056 1057 |
if (net->ipv4.fib_table_hash == NULL) return -ENOMEM; |
dce5cbeec
|
1058 1059 1060 1061 1062 1063 1064 1065 |
err = fib4_rules_init(net); if (err < 0) goto fail; return 0; fail: kfree(net->ipv4.fib_table_hash); return err; |
7b1a74fdb
|
1066 |
} |
1da177e4c
|
1067 |
|
2c8c1e729
|
1068 |
static void ip_fib_net_exit(struct net *net) |
7b1a74fdb
|
1069 1070 1071 1072 1073 1074 |
{ unsigned int i; #ifdef CONFIG_IP_MULTIPLE_TABLES fib4_rules_exit(net); #endif |
e2666f849
|
1075 |
rtnl_lock(); |
7b1a74fdb
|
1076 1077 1078 |
for (i = 0; i < FIB_TABLE_HASHSZ; i++) { struct fib_table *tb; struct hlist_head *head; |
b67bfe0d4
|
1079 |
struct hlist_node *tmp; |
63f3444fb
|
1080 |
|
e4aef8aea
|
1081 |
head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d4
|
1082 1083 |
hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { hlist_del(&tb->tb_hlist); |
16c6cf8bb
|
1084 |
fib_table_flush(tb); |
4aa2c466a
|
1085 |
fib_free_table(tb); |
7b1a74fdb
|
1086 1087 |
} } |
e2666f849
|
1088 |
rtnl_unlock(); |
e4aef8aea
|
1089 |
kfree(net->ipv4.fib_table_hash); |
7b1a74fdb
|
1090 1091 1092 1093 1094 |
} static int __net_init fib_net_init(struct net *net) { int error; |
f4530fa57
|
1095 1096 1097 |
#ifdef CONFIG_IP_ROUTE_CLASSID net->ipv4.fib_num_tclassid_users = 0; #endif |
7b1a74fdb
|
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 |
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) { |
c7ac8679b
|
1131 1132 1133 |
rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); |
7b1a74fdb
|
1134 1135 1136 1137 |
register_pernet_subsys(&fib_net_ops); register_netdevice_notifier(&fib_netdev_notifier); register_inetaddr_notifier(&fib_inetaddr_notifier); |
7f9b80529
|
1138 |
|
5348ba85a
|
1139 |
fib_trie_init(); |
1da177e4c
|
1140 |
} |