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net/ipv6/ip6_fib.c
32.9 KB
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/* |
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* Linux INET6 implementation |
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* Forwarding Information Database * * Authors: |
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* Pedro Roque <roque@di.fc.ul.pt> |
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* |
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* 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. */ /* * Changes: * Yuji SEKIYA @USAGI: Support default route on router node; * remove ip6_null_entry from the top of * routing table. |
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* Ville Nuorvala: Fixed routing subtrees. |
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*/ |
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#include <linux/errno.h> #include <linux/types.h> #include <linux/net.h> #include <linux/route.h> #include <linux/netdevice.h> #include <linux/in6.h> #include <linux/init.h> |
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#include <linux/list.h> |
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#include <linux/slab.h> |
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#ifdef CONFIG_PROC_FS #include <linux/proc_fs.h> #endif #include <net/ipv6.h> #include <net/ndisc.h> #include <net/addrconf.h> #include <net/ip6_fib.h> #include <net/ip6_route.h> #define RT6_DEBUG 2 #if RT6_DEBUG >= 3 #define RT6_TRACE(x...) printk(KERN_DEBUG x) #else #define RT6_TRACE(x...) do { ; } while (0) #endif |
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static struct kmem_cache * fib6_node_kmem __read_mostly; |
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enum fib_walk_state_t { #ifdef CONFIG_IPV6_SUBTREES FWS_S, #endif FWS_L, FWS_R, FWS_C, FWS_U }; struct fib6_cleaner_t { struct fib6_walker_t w; |
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struct net *net; |
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int (*func)(struct rt6_info *, void *arg); void *arg; }; |
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static DEFINE_RWLOCK(fib6_walker_lock); |
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#ifdef CONFIG_IPV6_SUBTREES #define FWS_INIT FWS_S |
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#else #define FWS_INIT FWS_L |
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#endif |
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static void fib6_prune_clones(struct net *net, struct fib6_node *fn, struct rt6_info *rt); |
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static struct rt6_info *fib6_find_prefix(struct net *net, struct fib6_node *fn); static struct fib6_node *fib6_repair_tree(struct net *net, struct fib6_node *fn); |
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static int fib6_walk(struct fib6_walker_t *w); static int fib6_walk_continue(struct fib6_walker_t *w); |
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/* * A routing update causes an increase of the serial number on the * affected subtree. This allows for cached routes to be asynchronously * tested when modifications are made to the destination cache as a * result of redirects, path MTU changes, etc. */ static __u32 rt_sernum; |
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static void fib6_gc_timer_cb(unsigned long arg); |
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static LIST_HEAD(fib6_walkers); #define FOR_WALKERS(w) list_for_each_entry(w, &fib6_walkers, lh) |
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static inline void fib6_walker_link(struct fib6_walker_t *w) { write_lock_bh(&fib6_walker_lock); |
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list_add(&w->lh, &fib6_walkers); |
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write_unlock_bh(&fib6_walker_lock); } static inline void fib6_walker_unlink(struct fib6_walker_t *w) { write_lock_bh(&fib6_walker_lock); |
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list_del(&w->lh); |
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write_unlock_bh(&fib6_walker_lock); } |
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static __inline__ u32 fib6_new_sernum(void) { u32 n = ++rt_sernum; if ((__s32)n <= 0) rt_sernum = n = 1; return n; } /* * Auxiliary address test functions for the radix tree. * |
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* These assume a 32bit processor (although it will work on |
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* 64bit processors) */ /* * test bit */ |
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#if defined(__LITTLE_ENDIAN) # define BITOP_BE32_SWIZZLE (0x1F & ~7) #else # define BITOP_BE32_SWIZZLE 0 #endif |
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|
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static __inline__ __be32 addr_bit_set(const void *token, int fn_bit) |
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{ |
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const __be32 *addr = token; |
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/* * Here, * 1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f) * is optimized version of * htonl(1 << ((~fn_bit)&0x1F)) * See include/asm-generic/bitops/le.h. */ |
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return (__force __be32)(1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f)) & addr[fn_bit >> 5]; |
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} |
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static __inline__ struct fib6_node * node_alloc(void) { struct fib6_node *fn; |
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fn = kmem_cache_zalloc(fib6_node_kmem, GFP_ATOMIC); |
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return fn; } static __inline__ void node_free(struct fib6_node * fn) { kmem_cache_free(fib6_node_kmem, fn); } static __inline__ void rt6_release(struct rt6_info *rt) { if (atomic_dec_and_test(&rt->rt6i_ref)) |
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dst_free(&rt->dst); |
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} |
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static void fib6_link_table(struct net *net, struct fib6_table *tb) |
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{ unsigned int h; |
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/* * Initialize table lock at a single place to give lockdep a key, * tables aren't visible prior to being linked to the list. */ rwlock_init(&tb->tb6_lock); |
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h = tb->tb6_id & (FIB6_TABLE_HASHSZ - 1); |
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/* * No protection necessary, this is the only list mutatation * operation, tables never disappear once they exist. */ |
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hlist_add_head_rcu(&tb->tb6_hlist, &net->ipv6.fib_table_hash[h]); |
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} |
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|
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES |
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static struct fib6_table *fib6_alloc_table(struct net *net, u32 id) |
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{ struct fib6_table *table; table = kzalloc(sizeof(*table), GFP_ATOMIC); if (table != NULL) { table->tb6_id = id; |
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table->tb6_root.leaf = net->ipv6.ip6_null_entry; |
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table->tb6_root.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; } return table; } |
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struct fib6_table *fib6_new_table(struct net *net, u32 id) |
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{ struct fib6_table *tb; if (id == 0) id = RT6_TABLE_MAIN; |
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tb = fib6_get_table(net, id); |
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if (tb) return tb; |
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tb = fib6_alloc_table(net, id); |
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if (tb != NULL) |
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fib6_link_table(net, tb); |
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return tb; } |
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struct fib6_table *fib6_get_table(struct net *net, u32 id) |
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{ struct fib6_table *tb; |
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struct hlist_head *head; |
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struct hlist_node *node; unsigned int h; if (id == 0) id = RT6_TABLE_MAIN; |
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h = id & (FIB6_TABLE_HASHSZ - 1); |
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rcu_read_lock(); |
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head = &net->ipv6.fib_table_hash[h]; hlist_for_each_entry_rcu(tb, node, head, tb6_hlist) { |
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if (tb->tb6_id == id) { rcu_read_unlock(); return tb; } } rcu_read_unlock(); return NULL; } |
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static void __net_init fib6_tables_init(struct net *net) |
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{ |
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fib6_link_table(net, net->ipv6.fib6_main_tbl); fib6_link_table(net, net->ipv6.fib6_local_tbl); |
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} |
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#else |
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struct fib6_table *fib6_new_table(struct net *net, u32 id) |
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{ |
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return fib6_get_table(net, id); |
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} |
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struct fib6_table *fib6_get_table(struct net *net, u32 id) |
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{ |
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return net->ipv6.fib6_main_tbl; |
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} |
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struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, |
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int flags, pol_lookup_t lookup) |
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{ |
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return (struct dst_entry *) lookup(net, net->ipv6.fib6_main_tbl, fl6, flags); |
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} |
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static void __net_init fib6_tables_init(struct net *net) |
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{ |
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fib6_link_table(net, net->ipv6.fib6_main_tbl); |
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} #endif |
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static int fib6_dump_node(struct fib6_walker_t *w) { int res; struct rt6_info *rt; |
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for (rt = w->leaf; rt; rt = rt->dst.rt6_next) { |
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res = rt6_dump_route(rt, w->args); if (res < 0) { /* Frame is full, suspend walking */ w->leaf = rt; return 1; } |
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WARN_ON(res == 0); |
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} w->leaf = NULL; return 0; } static void fib6_dump_end(struct netlink_callback *cb) { struct fib6_walker_t *w = (void*)cb->args[2]; if (w) { |
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if (cb->args[4]) { cb->args[4] = 0; fib6_walker_unlink(w); } |
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cb->args[2] = 0; kfree(w); } cb->done = (void*)cb->args[3]; cb->args[1] = 3; } static int fib6_dump_done(struct netlink_callback *cb) { fib6_dump_end(cb); return cb->done ? cb->done(cb) : 0; } static int fib6_dump_table(struct fib6_table *table, struct sk_buff *skb, struct netlink_callback *cb) { struct fib6_walker_t *w; int res; w = (void *)cb->args[2]; w->root = &table->tb6_root; if (cb->args[4] == 0) { |
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w->count = 0; w->skip = 0; |
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read_lock_bh(&table->tb6_lock); res = fib6_walk(w); read_unlock_bh(&table->tb6_lock); |
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if (res > 0) { |
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cb->args[4] = 1; |
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cb->args[5] = w->root->fn_sernum; } |
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} else { |
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if (cb->args[5] != w->root->fn_sernum) { /* Begin at the root if the tree changed */ cb->args[5] = w->root->fn_sernum; w->state = FWS_INIT; w->node = w->root; w->skip = w->count; } else w->skip = 0; |
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read_lock_bh(&table->tb6_lock); res = fib6_walk_continue(w); read_unlock_bh(&table->tb6_lock); |
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if (res <= 0) { fib6_walker_unlink(w); cb->args[4] = 0; |
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} |
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} |
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|
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return res; } |
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static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
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{ |
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struct net *net = sock_net(skb->sk); |
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unsigned int h, s_h; unsigned int e = 0, s_e; struct rt6_rtnl_dump_arg arg; struct fib6_walker_t *w; struct fib6_table *tb; struct hlist_node *node; |
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struct hlist_head *head; |
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int res = 0; s_h = cb->args[0]; s_e = cb->args[1]; w = (void *)cb->args[2]; if (w == NULL) { /* New dump: * * 1. hook callback destructor. */ cb->args[3] = (long)cb->done; cb->done = fib6_dump_done; /* * 2. allocate and initialize walker. */ w = kzalloc(sizeof(*w), GFP_ATOMIC); if (w == NULL) return -ENOMEM; w->func = fib6_dump_node; cb->args[2] = (long)w; } arg.skb = skb; arg.cb = cb; |
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arg.net = net; |
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w->args = &arg; |
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rcu_read_lock(); |
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for (h = s_h; h < FIB6_TABLE_HASHSZ; h++, s_e = 0) { |
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e = 0; |
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head = &net->ipv6.fib_table_hash[h]; |
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hlist_for_each_entry_rcu(tb, node, head, tb6_hlist) { |
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if (e < s_e) goto next; res = fib6_dump_table(tb, skb, cb); if (res != 0) goto out; next: e++; } } out: |
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rcu_read_unlock(); |
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cb->args[1] = e; cb->args[0] = h; res = res < 0 ? res : skb->len; if (res <= 0) fib6_dump_end(cb); return res; } |
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/* * Routing Table * * return the appropriate node for a routing tree "add" operation * by either creating and inserting or by returning an existing * node. */ static struct fib6_node * fib6_add_1(struct fib6_node *root, void *addr, int addrlen, int plen, int offset) { struct fib6_node *fn, *in, *ln; struct fib6_node *pn = NULL; struct rt6key *key; int bit; |
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__be32 dir = 0; |
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__u32 sernum = fib6_new_sernum(); RT6_TRACE("fib6_add_1 "); /* insert node in tree */ fn = root; do { key = (struct rt6key *)((u8 *)fn->leaf + offset); /* * Prefix match */ if (plen < fn->fn_bit || !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) goto insert_above; |
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/* * Exact match ? */ |
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if (plen == fn->fn_bit) { /* clean up an intermediate node */ if ((fn->fn_flags & RTN_RTINFO) == 0) { rt6_release(fn->leaf); fn->leaf = NULL; } |
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fn->fn_sernum = sernum; |
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return fn; } /* * We have more bits to go */ |
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/* Try to walk down on tree. */ fn->fn_sernum = sernum; dir = addr_bit_set(addr, fn->fn_bit); pn = fn; fn = dir ? fn->right: fn->left; } while (fn); /* * We walked to the bottom of tree. * Create new leaf node without children. */ ln = node_alloc(); if (ln == NULL) return NULL; ln->fn_bit = plen; |
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ln->parent = pn; ln->fn_sernum = sernum; if (dir) pn->right = ln; else pn->left = ln; return ln; insert_above: /* |
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* split since we don't have a common prefix anymore or |
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* we have a less significant route. * we've to insert an intermediate node on the list * this new node will point to the one we need to create * and the current */ pn = fn->parent; /* find 1st bit in difference between the 2 addrs. |
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See comment in __ipv6_addr_diff: bit may be an invalid value, |
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but if it is >= plen, the value is ignored in any case. */ |
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bit = __ipv6_addr_diff(addr, &key->addr, addrlen); |
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/* * (intermediate)[in] |
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* / \ * (new leaf node)[ln] (old node)[fn] */ if (plen > bit) { in = node_alloc(); ln = node_alloc(); |
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if (in == NULL || ln == NULL) { if (in) node_free(in); if (ln) node_free(ln); return NULL; } |
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/* * new intermediate node. |
1da177e4c Linux-2.6.12-rc2 |
519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 |
* RTN_RTINFO will * be off since that an address that chooses one of * the branches would not match less specific routes * in the other branch */ in->fn_bit = bit; in->parent = pn; in->leaf = fn->leaf; atomic_inc(&in->leaf->rt6i_ref); in->fn_sernum = sernum; /* update parent pointer */ if (dir) pn->right = in; else pn->left = in; ln->fn_bit = plen; ln->parent = in; fn->parent = in; ln->fn_sernum = sernum; if (addr_bit_set(addr, bit)) { in->right = ln; in->left = fn; } else { in->left = ln; in->right = fn; } } else { /* plen <= bit */ |
1ab1457c4 [NET] IPV6: Fix w... |
554 |
/* |
1da177e4c Linux-2.6.12-rc2 |
555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 |
* (new leaf node)[ln] * / \ * (old node)[fn] NULL */ ln = node_alloc(); if (ln == NULL) return NULL; ln->fn_bit = plen; ln->parent = pn; ln->fn_sernum = sernum; |
1ab1457c4 [NET] IPV6: Fix w... |
570 |
|
1da177e4c Linux-2.6.12-rc2 |
571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 |
if (dir) pn->right = ln; else pn->left = ln; if (addr_bit_set(&key->addr, plen)) ln->right = fn; else ln->left = fn; fn->parent = ln; } return ln; } /* * Insert routing information in a node. */ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt, |
86872cb57 [IPv6] route: FIB... |
591 |
struct nl_info *info) |
1da177e4c Linux-2.6.12-rc2 |
592 593 594 595 596 |
{ struct rt6_info *iter = NULL; struct rt6_info **ins; ins = &fn->leaf; |
d8d1f30b9 net-next: remove ... |
597 |
for (iter = fn->leaf; iter; iter=iter->dst.rt6_next) { |
1da177e4c Linux-2.6.12-rc2 |
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 |
/* * Search for duplicates */ if (iter->rt6i_metric == rt->rt6i_metric) { /* * Same priority level */ if (iter->rt6i_dev == rt->rt6i_dev && iter->rt6i_idev == rt->rt6i_idev && ipv6_addr_equal(&iter->rt6i_gateway, &rt->rt6i_gateway)) { if (!(iter->rt6i_flags&RTF_EXPIRES)) return -EEXIST; iter->rt6i_expires = rt->rt6i_expires; if (!(rt->rt6i_flags&RTF_EXPIRES)) { iter->rt6i_flags &= ~RTF_EXPIRES; iter->rt6i_expires = 0; } return -EEXIST; } } if (iter->rt6i_metric > rt->rt6i_metric) break; |
d8d1f30b9 net-next: remove ... |
624 |
ins = &iter->dst.rt6_next; |
1da177e4c Linux-2.6.12-rc2 |
625 |
} |
f11e6659c [IPV6]: Fix routi... |
626 627 628 |
/* Reset round-robin state, if necessary */ if (ins == &fn->leaf) fn->rr_ptr = NULL; |
1da177e4c Linux-2.6.12-rc2 |
629 630 631 |
/* * insert node */ |
d8d1f30b9 net-next: remove ... |
632 |
rt->dst.rt6_next = iter; |
1da177e4c Linux-2.6.12-rc2 |
633 634 635 |
*ins = rt; rt->rt6i_node = fn; atomic_inc(&rt->rt6i_ref); |
86872cb57 [IPv6] route: FIB... |
636 |
inet6_rt_notify(RTM_NEWROUTE, rt, info); |
c572872f8 [NETNS][IPV6] rt6... |
637 |
info->nl_net->ipv6.rt6_stats->fib_rt_entries++; |
1da177e4c Linux-2.6.12-rc2 |
638 639 |
if ((fn->fn_flags & RTN_RTINFO) == 0) { |
c572872f8 [NETNS][IPV6] rt6... |
640 |
info->nl_net->ipv6.rt6_stats->fib_route_nodes++; |
1da177e4c Linux-2.6.12-rc2 |
641 642 643 644 645 |
fn->fn_flags |= RTN_RTINFO; } return 0; } |
63152fc0d [NETNS][IPV6] ip6... |
646 |
static __inline__ void fib6_start_gc(struct net *net, struct rt6_info *rt) |
1da177e4c Linux-2.6.12-rc2 |
647 |
{ |
417f28bb3 netns: dont alloc... |
648 |
if (!timer_pending(&net->ipv6.ip6_fib_timer) && |
1da177e4c Linux-2.6.12-rc2 |
649 |
(rt->rt6i_flags & (RTF_EXPIRES|RTF_CACHE))) |
417f28bb3 netns: dont alloc... |
650 |
mod_timer(&net->ipv6.ip6_fib_timer, |
847499ce7 ipv6: use timer p... |
651 |
jiffies + net->ipv6.sysctl.ip6_rt_gc_interval); |
1da177e4c Linux-2.6.12-rc2 |
652 |
} |
63152fc0d [NETNS][IPV6] ip6... |
653 |
void fib6_force_start_gc(struct net *net) |
1da177e4c Linux-2.6.12-rc2 |
654 |
{ |
417f28bb3 netns: dont alloc... |
655 656 |
if (!timer_pending(&net->ipv6.ip6_fib_timer)) mod_timer(&net->ipv6.ip6_fib_timer, |
847499ce7 ipv6: use timer p... |
657 |
jiffies + net->ipv6.sysctl.ip6_rt_gc_interval); |
1da177e4c Linux-2.6.12-rc2 |
658 659 660 661 662 663 664 |
} /* * Add routing information to the routing tree. * <destination addr>/<source addr> * with source addr info in sub-trees */ |
86872cb57 [IPv6] route: FIB... |
665 |
int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info) |
1da177e4c Linux-2.6.12-rc2 |
666 |
{ |
66729e18d [IPV6] ROUTE: Mak... |
667 |
struct fib6_node *fn, *pn = NULL; |
1da177e4c Linux-2.6.12-rc2 |
668 669 670 671 672 673 674 |
int err = -ENOMEM; fn = fib6_add_1(root, &rt->rt6i_dst.addr, sizeof(struct in6_addr), rt->rt6i_dst.plen, offsetof(struct rt6_info, rt6i_dst)); if (fn == NULL) goto out; |
66729e18d [IPV6] ROUTE: Mak... |
675 |
pn = fn; |
1da177e4c Linux-2.6.12-rc2 |
676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 |
#ifdef CONFIG_IPV6_SUBTREES if (rt->rt6i_src.plen) { struct fib6_node *sn; if (fn->subtree == NULL) { struct fib6_node *sfn; /* * Create subtree. * * fn[main tree] * | * sfn[subtree root] * \ * sn[new leaf node] */ /* Create subtree root node */ sfn = node_alloc(); if (sfn == NULL) goto st_failure; |
8ed677896 [NETNS][IPV6] rt6... |
697 698 |
sfn->leaf = info->nl_net->ipv6.ip6_null_entry; atomic_inc(&info->nl_net->ipv6.ip6_null_entry->rt6i_ref); |
1da177e4c Linux-2.6.12-rc2 |
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 |
sfn->fn_flags = RTN_ROOT; sfn->fn_sernum = fib6_new_sernum(); /* Now add the first leaf node to new subtree */ sn = fib6_add_1(sfn, &rt->rt6i_src.addr, sizeof(struct in6_addr), rt->rt6i_src.plen, offsetof(struct rt6_info, rt6i_src)); if (sn == NULL) { /* If it is failed, discard just allocated root, and then (in st_failure) stale node in main tree. */ node_free(sfn); goto st_failure; } /* Now link new subtree to main tree */ sfn->parent = fn; fn->subtree = sfn; |
1da177e4c Linux-2.6.12-rc2 |
720 721 722 723 724 725 726 727 |
} else { sn = fib6_add_1(fn->subtree, &rt->rt6i_src.addr, sizeof(struct in6_addr), rt->rt6i_src.plen, offsetof(struct rt6_info, rt6i_src)); if (sn == NULL) goto st_failure; } |
66729e18d [IPV6] ROUTE: Mak... |
728 729 730 731 |
if (fn->leaf == NULL) { fn->leaf = rt; atomic_inc(&rt->rt6i_ref); } |
1da177e4c Linux-2.6.12-rc2 |
732 733 734 |
fn = sn; } #endif |
86872cb57 [IPv6] route: FIB... |
735 |
err = fib6_add_rt2node(fn, rt, info); |
1da177e4c Linux-2.6.12-rc2 |
736 737 |
if (err == 0) { |
63152fc0d [NETNS][IPV6] ip6... |
738 |
fib6_start_gc(info->nl_net, rt); |
1da177e4c Linux-2.6.12-rc2 |
739 |
if (!(rt->rt6i_flags&RTF_CACHE)) |
ec7d43c29 [NETNS][IPV6] ip6... |
740 |
fib6_prune_clones(info->nl_net, pn, rt); |
1da177e4c Linux-2.6.12-rc2 |
741 742 743 |
} out: |
66729e18d [IPV6] ROUTE: Mak... |
744 745 746 747 748 749 |
if (err) { #ifdef CONFIG_IPV6_SUBTREES /* * If fib6_add_1 has cleared the old leaf pointer in the * super-tree leaf node we have to find a new one for it. */ |
3c051235a [IPV6]: Fix dangl... |
750 751 752 753 |
if (pn != fn && pn->leaf == rt) { pn->leaf = NULL; atomic_dec(&rt->rt6i_ref); } |
66729e18d [IPV6] ROUTE: Mak... |
754 |
if (pn != fn && !pn->leaf && !(pn->fn_flags & RTN_RTINFO)) { |
8ed677896 [NETNS][IPV6] rt6... |
755 |
pn->leaf = fib6_find_prefix(info->nl_net, pn); |
66729e18d [IPV6] ROUTE: Mak... |
756 757 |
#if RT6_DEBUG >= 2 if (!pn->leaf) { |
547b792ca net: convert BUG_... |
758 |
WARN_ON(pn->leaf == NULL); |
8ed677896 [NETNS][IPV6] rt6... |
759 |
pn->leaf = info->nl_net->ipv6.ip6_null_entry; |
66729e18d [IPV6] ROUTE: Mak... |
760 761 762 763 764 |
} #endif atomic_inc(&pn->leaf->rt6i_ref); } #endif |
d8d1f30b9 net-next: remove ... |
765 |
dst_free(&rt->dst); |
66729e18d [IPV6] ROUTE: Mak... |
766 |
} |
1da177e4c Linux-2.6.12-rc2 |
767 768 769 770 771 772 773 774 |
return err; #ifdef CONFIG_IPV6_SUBTREES /* Subtree creation failed, probably main tree node is orphan. If it is, shoot it. */ st_failure: if (fn && !(fn->fn_flags & (RTN_RTINFO|RTN_ROOT))) |
8ed677896 [NETNS][IPV6] rt6... |
775 |
fib6_repair_tree(info->nl_net, fn); |
d8d1f30b9 net-next: remove ... |
776 |
dst_free(&rt->dst); |
1da177e4c Linux-2.6.12-rc2 |
777 778 779 780 781 782 783 784 785 786 787 |
return err; #endif } /* * Routing tree lookup * */ struct lookup_args { int offset; /* key offset on rt6_info */ |
b71d1d426 inet: constify ip... |
788 |
const struct in6_addr *addr; /* search key */ |
1da177e4c Linux-2.6.12-rc2 |
789 790 791 792 793 794 |
}; static struct fib6_node * fib6_lookup_1(struct fib6_node *root, struct lookup_args *args) { struct fib6_node *fn; |
e69a4adc6 [IPV6]: Misc endi... |
795 |
__be32 dir; |
1da177e4c Linux-2.6.12-rc2 |
796 |
|
825e288ef [IPV6] ROUTE: Mak... |
797 798 |
if (unlikely(args->offset == 0)) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 |
/* * Descend on a tree */ fn = root; for (;;) { struct fib6_node *next; dir = addr_bit_set(args->addr, fn->fn_bit); next = dir ? fn->right : fn->left; if (next) { fn = next; continue; } break; } |
3fc5e0440 [IPV6] ROUTE: Fix... |
819 |
while(fn) { |
7fc33165a [IPV6] ROUTE: Put... |
820 |
if (FIB6_SUBTREE(fn) || fn->fn_flags & RTN_RTINFO) { |
1da177e4c Linux-2.6.12-rc2 |
821 822 823 824 |
struct rt6key *key; key = (struct rt6key *) ((u8 *) fn->leaf + args->offset); |
3fc5e0440 [IPV6] ROUTE: Fix... |
825 826 827 828 829 830 831 832 |
if (ipv6_prefix_equal(&key->addr, args->addr, key->plen)) { #ifdef CONFIG_IPV6_SUBTREES if (fn->subtree) fn = fib6_lookup_1(fn->subtree, args + 1); #endif if (!fn || fn->fn_flags & RTN_RTINFO) return fn; } |
1da177e4c Linux-2.6.12-rc2 |
833 |
} |
3fc5e0440 [IPV6] ROUTE: Fix... |
834 835 |
if (fn->fn_flags & RTN_ROOT) break; |
1da177e4c Linux-2.6.12-rc2 |
836 837 838 839 840 |
fn = fn->parent; } return NULL; } |
b71d1d426 inet: constify ip... |
841 842 |
struct fib6_node * fib6_lookup(struct fib6_node *root, const struct in6_addr *daddr, const struct in6_addr *saddr) |
1da177e4c Linux-2.6.12-rc2 |
843 |
{ |
1da177e4c Linux-2.6.12-rc2 |
844 |
struct fib6_node *fn; |
825e288ef [IPV6] ROUTE: Mak... |
845 846 847 848 849 |
struct lookup_args args[] = { { .offset = offsetof(struct rt6_info, rt6i_dst), .addr = daddr, }, |
1da177e4c Linux-2.6.12-rc2 |
850 |
#ifdef CONFIG_IPV6_SUBTREES |
825e288ef [IPV6] ROUTE: Mak... |
851 852 853 854 |
{ .offset = offsetof(struct rt6_info, rt6i_src), .addr = saddr, }, |
1da177e4c Linux-2.6.12-rc2 |
855 |
#endif |
825e288ef [IPV6] ROUTE: Mak... |
856 857 858 859 |
{ .offset = 0, /* sentinel */ } }; |
1da177e4c Linux-2.6.12-rc2 |
860 |
|
fefc2a6c2 [IPV6] ROUTE: All... |
861 |
fn = fib6_lookup_1(root, daddr ? args : args + 1); |
1da177e4c Linux-2.6.12-rc2 |
862 863 864 865 866 867 868 869 870 871 872 873 874 875 |
if (fn == NULL || fn->fn_flags & RTN_TL_ROOT) fn = root; return fn; } /* * Get node with specified destination prefix (and source prefix, * if subtrees are used) */ static struct fib6_node * fib6_locate_1(struct fib6_node *root, |
b71d1d426 inet: constify ip... |
876 |
const struct in6_addr *addr, |
1da177e4c Linux-2.6.12-rc2 |
877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 |
int plen, int offset) { struct fib6_node *fn; for (fn = root; fn ; ) { struct rt6key *key = (struct rt6key *)((u8 *)fn->leaf + offset); /* * Prefix match */ if (plen < fn->fn_bit || !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) return NULL; if (plen == fn->fn_bit) return fn; /* * We have more bits to go */ if (addr_bit_set(addr, fn->fn_bit)) fn = fn->right; else fn = fn->left; } return NULL; } struct fib6_node * fib6_locate(struct fib6_node *root, |
b71d1d426 inet: constify ip... |
906 907 |
const struct in6_addr *daddr, int dst_len, const struct in6_addr *saddr, int src_len) |
1da177e4c Linux-2.6.12-rc2 |
908 909 910 911 912 913 914 915 |
{ struct fib6_node *fn; fn = fib6_locate_1(root, daddr, dst_len, offsetof(struct rt6_info, rt6i_dst)); #ifdef CONFIG_IPV6_SUBTREES if (src_len) { |
547b792ca net: convert BUG_... |
916 |
WARN_ON(saddr == NULL); |
3fc5e0440 [IPV6] ROUTE: Fix... |
917 918 |
if (fn && fn->subtree) fn = fib6_locate_1(fn->subtree, saddr, src_len, |
1da177e4c Linux-2.6.12-rc2 |
919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 |
offsetof(struct rt6_info, rt6i_src)); } #endif if (fn && fn->fn_flags&RTN_RTINFO) return fn; return NULL; } /* * Deletion * */ |
8ed677896 [NETNS][IPV6] rt6... |
934 |
static struct rt6_info *fib6_find_prefix(struct net *net, struct fib6_node *fn) |
1da177e4c Linux-2.6.12-rc2 |
935 936 |
{ if (fn->fn_flags&RTN_ROOT) |
8ed677896 [NETNS][IPV6] rt6... |
937 |
return net->ipv6.ip6_null_entry; |
1da177e4c Linux-2.6.12-rc2 |
938 939 940 941 942 943 944 |
while(fn) { if(fn->left) return fn->left->leaf; if(fn->right) return fn->right->leaf; |
7fc33165a [IPV6] ROUTE: Put... |
945 |
fn = FIB6_SUBTREE(fn); |
1da177e4c Linux-2.6.12-rc2 |
946 947 948 949 950 951 952 953 |
} return NULL; } /* * Called to trim the tree of intermediate nodes when possible. "fn" * is the node we want to try and remove. */ |
8ed677896 [NETNS][IPV6] rt6... |
954 955 |
static struct fib6_node *fib6_repair_tree(struct net *net, struct fib6_node *fn) |
1da177e4c Linux-2.6.12-rc2 |
956 957 958 959 960 961 962 963 964 965 966 |
{ int children; int nstate; struct fib6_node *child, *pn; struct fib6_walker_t *w; int iter = 0; for (;;) { RT6_TRACE("fixing tree: plen=%d iter=%d ", fn->fn_bit, iter); iter++; |
547b792ca net: convert BUG_... |
967 968 969 |
WARN_ON(fn->fn_flags & RTN_RTINFO); WARN_ON(fn->fn_flags & RTN_TL_ROOT); WARN_ON(fn->leaf != NULL); |
1da177e4c Linux-2.6.12-rc2 |
970 971 972 973 974 |
children = 0; child = NULL; if (fn->right) child = fn->right, children |= 1; if (fn->left) child = fn->left, children |= 2; |
7fc33165a [IPV6] ROUTE: Put... |
975 |
if (children == 3 || FIB6_SUBTREE(fn) |
1da177e4c Linux-2.6.12-rc2 |
976 977 978 979 980 |
#ifdef CONFIG_IPV6_SUBTREES /* Subtree root (i.e. fn) may have one child */ || (children && fn->fn_flags&RTN_ROOT) #endif ) { |
8ed677896 [NETNS][IPV6] rt6... |
981 |
fn->leaf = fib6_find_prefix(net, fn); |
1da177e4c Linux-2.6.12-rc2 |
982 983 |
#if RT6_DEBUG >= 2 if (fn->leaf==NULL) { |
547b792ca net: convert BUG_... |
984 |
WARN_ON(!fn->leaf); |
8ed677896 [NETNS][IPV6] rt6... |
985 |
fn->leaf = net->ipv6.ip6_null_entry; |
1da177e4c Linux-2.6.12-rc2 |
986 987 988 989 990 991 992 993 |
} #endif atomic_inc(&fn->leaf->rt6i_ref); return fn->parent; } pn = fn->parent; #ifdef CONFIG_IPV6_SUBTREES |
7fc33165a [IPV6] ROUTE: Put... |
994 |
if (FIB6_SUBTREE(pn) == fn) { |
547b792ca net: convert BUG_... |
995 |
WARN_ON(!(fn->fn_flags & RTN_ROOT)); |
7fc33165a [IPV6] ROUTE: Put... |
996 |
FIB6_SUBTREE(pn) = NULL; |
1da177e4c Linux-2.6.12-rc2 |
997 998 |
nstate = FWS_L; } else { |
547b792ca net: convert BUG_... |
999 |
WARN_ON(fn->fn_flags & RTN_ROOT); |
1da177e4c Linux-2.6.12-rc2 |
1000 1001 1002 1003 |
#endif if (pn->right == fn) pn->right = child; else if (pn->left == fn) pn->left = child; #if RT6_DEBUG >= 2 |
547b792ca net: convert BUG_... |
1004 1005 |
else WARN_ON(1); |
1da177e4c Linux-2.6.12-rc2 |
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 |
#endif if (child) child->parent = pn; nstate = FWS_R; #ifdef CONFIG_IPV6_SUBTREES } #endif read_lock(&fib6_walker_lock); FOR_WALKERS(w) { if (child == NULL) { if (w->root == fn) { w->root = w->node = NULL; RT6_TRACE("W %p adjusted by delroot 1 ", w); } else if (w->node == fn) { RT6_TRACE("W %p adjusted by delnode 1, s=%d/%d ", w, w->state, nstate); w->node = pn; w->state = nstate; } } else { if (w->root == fn) { w->root = child; RT6_TRACE("W %p adjusted by delroot 2 ", w); } if (w->node == fn) { w->node = child; if (children&2) { RT6_TRACE("W %p adjusted by delnode 2, s=%d ", w, w->state); w->state = w->state>=FWS_R ? FWS_U : FWS_INIT; } else { RT6_TRACE("W %p adjusted by delnode 2, s=%d ", w, w->state); w->state = w->state>=FWS_C ? FWS_U : FWS_INIT; } } } } read_unlock(&fib6_walker_lock); node_free(fn); |
7fc33165a [IPV6] ROUTE: Put... |
1050 |
if (pn->fn_flags&RTN_RTINFO || FIB6_SUBTREE(pn)) |
1da177e4c Linux-2.6.12-rc2 |
1051 1052 1053 1054 1055 1056 1057 1058 1059 |
return pn; rt6_release(pn->leaf); pn->leaf = NULL; fn = pn; } } static void fib6_del_route(struct fib6_node *fn, struct rt6_info **rtp, |
86872cb57 [IPv6] route: FIB... |
1060 |
struct nl_info *info) |
1da177e4c Linux-2.6.12-rc2 |
1061 1062 1063 |
{ struct fib6_walker_t *w; struct rt6_info *rt = *rtp; |
c572872f8 [NETNS][IPV6] rt6... |
1064 |
struct net *net = info->nl_net; |
1da177e4c Linux-2.6.12-rc2 |
1065 1066 1067 1068 1069 |
RT6_TRACE("fib6_del_route "); /* Unlink it */ |
d8d1f30b9 net-next: remove ... |
1070 |
*rtp = rt->dst.rt6_next; |
1da177e4c Linux-2.6.12-rc2 |
1071 |
rt->rt6i_node = NULL; |
c572872f8 [NETNS][IPV6] rt6... |
1072 1073 |
net->ipv6.rt6_stats->fib_rt_entries--; net->ipv6.rt6_stats->fib_discarded_routes++; |
1da177e4c Linux-2.6.12-rc2 |
1074 |
|
f11e6659c [IPV6]: Fix routi... |
1075 1076 1077 |
/* Reset round-robin state, if necessary */ if (fn->rr_ptr == rt) fn->rr_ptr = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1078 1079 1080 1081 1082 1083 |
/* Adjust walkers */ read_lock(&fib6_walker_lock); FOR_WALKERS(w) { if (w->state == FWS_C && w->leaf == rt) { RT6_TRACE("walker %p adjusted by delroute ", w); |
d8d1f30b9 net-next: remove ... |
1084 |
w->leaf = rt->dst.rt6_next; |
1da177e4c Linux-2.6.12-rc2 |
1085 1086 1087 1088 1089 |
if (w->leaf == NULL) w->state = FWS_U; } } read_unlock(&fib6_walker_lock); |
d8d1f30b9 net-next: remove ... |
1090 |
rt->dst.rt6_next = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1091 |
|
1da177e4c Linux-2.6.12-rc2 |
1092 1093 1094 |
/* If it was last route, expunge its radix tree node */ if (fn->leaf == NULL) { fn->fn_flags &= ~RTN_RTINFO; |
c572872f8 [NETNS][IPV6] rt6... |
1095 |
net->ipv6.rt6_stats->fib_route_nodes--; |
8ed677896 [NETNS][IPV6] rt6... |
1096 |
fn = fib6_repair_tree(net, fn); |
1da177e4c Linux-2.6.12-rc2 |
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 |
} if (atomic_read(&rt->rt6i_ref) != 1) { /* This route is used as dummy address holder in some split * nodes. It is not leaked, but it still holds other resources, * which must be released in time. So, scan ascendant nodes * and replace dummy references to this route with references * to still alive ones. */ while (fn) { if (!(fn->fn_flags&RTN_RTINFO) && fn->leaf == rt) { |
8ed677896 [NETNS][IPV6] rt6... |
1108 |
fn->leaf = fib6_find_prefix(net, fn); |
1da177e4c Linux-2.6.12-rc2 |
1109 1110 1111 1112 1113 1114 |
atomic_inc(&fn->leaf->rt6i_ref); rt6_release(rt); } fn = fn->parent; } /* No more references are possible at this point. */ |
2df96af03 [IPV6]: Use BUG_O... |
1115 |
BUG_ON(atomic_read(&rt->rt6i_ref) != 1); |
1da177e4c Linux-2.6.12-rc2 |
1116 |
} |
86872cb57 [IPv6] route: FIB... |
1117 |
inet6_rt_notify(RTM_DELROUTE, rt, info); |
1da177e4c Linux-2.6.12-rc2 |
1118 1119 |
rt6_release(rt); } |
86872cb57 [IPv6] route: FIB... |
1120 |
int fib6_del(struct rt6_info *rt, struct nl_info *info) |
1da177e4c Linux-2.6.12-rc2 |
1121 |
{ |
8ed677896 [NETNS][IPV6] rt6... |
1122 |
struct net *net = info->nl_net; |
1da177e4c Linux-2.6.12-rc2 |
1123 1124 1125 1126 |
struct fib6_node *fn = rt->rt6i_node; struct rt6_info **rtp; #if RT6_DEBUG >= 2 |
d8d1f30b9 net-next: remove ... |
1127 |
if (rt->dst.obsolete>0) { |
547b792ca net: convert BUG_... |
1128 |
WARN_ON(fn != NULL); |
1da177e4c Linux-2.6.12-rc2 |
1129 1130 1131 |
return -ENOENT; } #endif |
8ed677896 [NETNS][IPV6] rt6... |
1132 |
if (fn == NULL || rt == net->ipv6.ip6_null_entry) |
1da177e4c Linux-2.6.12-rc2 |
1133 |
return -ENOENT; |
547b792ca net: convert BUG_... |
1134 |
WARN_ON(!(fn->fn_flags & RTN_RTINFO)); |
1da177e4c Linux-2.6.12-rc2 |
1135 |
|
150730d5a [IPV6] ROUTE: Pur... |
1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 |
if (!(rt->rt6i_flags&RTF_CACHE)) { struct fib6_node *pn = fn; #ifdef CONFIG_IPV6_SUBTREES /* clones of this route might be in another subtree */ if (rt->rt6i_src.plen) { while (!(pn->fn_flags&RTN_ROOT)) pn = pn->parent; pn = pn->parent; } #endif |
ec7d43c29 [NETNS][IPV6] ip6... |
1146 |
fib6_prune_clones(info->nl_net, pn, rt); |
150730d5a [IPV6] ROUTE: Pur... |
1147 |
} |
1da177e4c Linux-2.6.12-rc2 |
1148 1149 1150 1151 |
/* * Walk the leaf entries looking for ourself */ |
d8d1f30b9 net-next: remove ... |
1152 |
for (rtp = &fn->leaf; *rtp; rtp = &(*rtp)->dst.rt6_next) { |
1da177e4c Linux-2.6.12-rc2 |
1153 |
if (*rtp == rt) { |
86872cb57 [IPv6] route: FIB... |
1154 |
fib6_del_route(fn, rtp, info); |
1da177e4c Linux-2.6.12-rc2 |
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 |
return 0; } } return -ENOENT; } /* * Tree traversal function. * * Certainly, it is not interrupt safe. * However, it is internally reenterable wrt itself and fib6_add/fib6_del. * It means, that we can modify tree during walking * and use this function for garbage collection, clone pruning, |
1ab1457c4 [NET] IPV6: Fix w... |
1168 |
* cleaning tree when a device goes down etc. etc. |
1da177e4c Linux-2.6.12-rc2 |
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 |
* * It guarantees that every node will be traversed, * and that it will be traversed only once. * * Callback function w->func may return: * 0 -> continue walking. * positive value -> walking is suspended (used by tree dumps, * and probably by gc, if it will be split to several slices) * negative value -> terminate walking. * * The function itself returns: * 0 -> walk is complete. * >0 -> walk is incomplete (i.e. suspended) * <0 -> walk is terminated by an error. */ |
90d41122f [IPV6] ip6_fib.c:... |
1184 |
static int fib6_walk_continue(struct fib6_walker_t *w) |
1da177e4c Linux-2.6.12-rc2 |
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 |
{ struct fib6_node *fn, *pn; for (;;) { fn = w->node; if (fn == NULL) return 0; if (w->prune && fn != w->root && fn->fn_flags&RTN_RTINFO && w->state < FWS_C) { w->state = FWS_C; w->leaf = fn->leaf; } switch (w->state) { #ifdef CONFIG_IPV6_SUBTREES case FWS_S: |
7fc33165a [IPV6] ROUTE: Put... |
1201 1202 |
if (FIB6_SUBTREE(fn)) { w->node = FIB6_SUBTREE(fn); |
1da177e4c Linux-2.6.12-rc2 |
1203 1204 1205 |
continue; } w->state = FWS_L; |
1ab1457c4 [NET] IPV6: Fix w... |
1206 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 |
case FWS_L: if (fn->left) { w->node = fn->left; w->state = FWS_INIT; continue; } w->state = FWS_R; case FWS_R: if (fn->right) { w->node = fn->right; w->state = FWS_INIT; continue; } w->state = FWS_C; w->leaf = fn->leaf; case FWS_C: if (w->leaf && fn->fn_flags&RTN_RTINFO) { |
2bec5a369 ipv6: fib: fix cr... |
1224 1225 1226 1227 1228 1229 1230 1231 |
int err; if (w->count < w->skip) { w->count++; continue; } err = w->func(w); |
1da177e4c Linux-2.6.12-rc2 |
1232 1233 |
if (err) return err; |
2bec5a369 ipv6: fib: fix cr... |
1234 1235 |
w->count++; |
1da177e4c Linux-2.6.12-rc2 |
1236 1237 1238 1239 1240 1241 1242 1243 1244 |
continue; } w->state = FWS_U; case FWS_U: if (fn == w->root) return 0; pn = fn->parent; w->node = pn; #ifdef CONFIG_IPV6_SUBTREES |
7fc33165a [IPV6] ROUTE: Put... |
1245 |
if (FIB6_SUBTREE(pn) == fn) { |
547b792ca net: convert BUG_... |
1246 |
WARN_ON(!(fn->fn_flags & RTN_ROOT)); |
1da177e4c Linux-2.6.12-rc2 |
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 |
w->state = FWS_L; continue; } #endif if (pn->left == fn) { w->state = FWS_R; continue; } if (pn->right == fn) { w->state = FWS_C; w->leaf = w->node->leaf; continue; } #if RT6_DEBUG >= 2 |
547b792ca net: convert BUG_... |
1261 |
WARN_ON(1); |
1da177e4c Linux-2.6.12-rc2 |
1262 1263 1264 1265 |
#endif } } } |
90d41122f [IPV6] ip6_fib.c:... |
1266 |
static int fib6_walk(struct fib6_walker_t *w) |
1da177e4c Linux-2.6.12-rc2 |
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 |
{ int res; w->state = FWS_INIT; w->node = w->root; fib6_walker_link(w); res = fib6_walk_continue(w); if (res <= 0) fib6_walker_unlink(w); return res; } static int fib6_clean_node(struct fib6_walker_t *w) { int res; struct rt6_info *rt; |
0a8891a0a [IPv6]: use conta... |
1284 |
struct fib6_cleaner_t *c = container_of(w, struct fib6_cleaner_t, w); |
ec7d43c29 [NETNS][IPV6] ip6... |
1285 1286 1287 |
struct nl_info info = { .nl_net = c->net, }; |
1da177e4c Linux-2.6.12-rc2 |
1288 |
|
d8d1f30b9 net-next: remove ... |
1289 |
for (rt = w->leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4c Linux-2.6.12-rc2 |
1290 1291 1292 |
res = c->func(rt, c->arg); if (res < 0) { w->leaf = rt; |
528c4ceb4 [IPV6]: Always pa... |
1293 |
res = fib6_del(rt, &info); |
1da177e4c Linux-2.6.12-rc2 |
1294 1295 1296 1297 1298 1299 1300 1301 1302 |
if (res) { #if RT6_DEBUG >= 2 printk(KERN_DEBUG "fib6_clean_node: del failed: rt=%p@%p err=%d ", rt, rt->rt6i_node, res); #endif continue; } return 0; } |
547b792ca net: convert BUG_... |
1303 |
WARN_ON(res != 0); |
1da177e4c Linux-2.6.12-rc2 |
1304 1305 1306 1307 1308 1309 1310 |
} w->leaf = rt; return 0; } /* * Convenient frontend to tree walker. |
1ab1457c4 [NET] IPV6: Fix w... |
1311 |
* |
1da177e4c Linux-2.6.12-rc2 |
1312 1313 1314 1315 1316 1317 1318 |
* func is called on each route. * It may return -1 -> delete this route. * 0 -> continue walking * * prune==1 -> only immediate children of node (certainly, * ignoring pure split nodes) will be scanned. */ |
ec7d43c29 [NETNS][IPV6] ip6... |
1319 |
static void fib6_clean_tree(struct net *net, struct fib6_node *root, |
8ce11e6a9 [NET]: Make code ... |
1320 1321 |
int (*func)(struct rt6_info *, void *arg), int prune, void *arg) |
1da177e4c Linux-2.6.12-rc2 |
1322 1323 1324 1325 1326 1327 |
{ struct fib6_cleaner_t c; c.w.root = root; c.w.func = fib6_clean_node; c.w.prune = prune; |
2bec5a369 ipv6: fib: fix cr... |
1328 1329 |
c.w.count = 0; c.w.skip = 0; |
1da177e4c Linux-2.6.12-rc2 |
1330 1331 |
c.func = func; c.arg = arg; |
ec7d43c29 [NETNS][IPV6] ip6... |
1332 |
c.net = net; |
1da177e4c Linux-2.6.12-rc2 |
1333 1334 1335 |
fib6_walk(&c.w); } |
f3db48517 [NETNS][IPV6] ip6... |
1336 |
void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg), |
c71099acc [IPV6]: Multiple ... |
1337 1338 |
int prune, void *arg) { |
c71099acc [IPV6]: Multiple ... |
1339 |
struct fib6_table *table; |
1b43af548 [IPV6]: Increase ... |
1340 |
struct hlist_node *node; |
58f09b78b [NETNS][IPV6] ip6... |
1341 |
struct hlist_head *head; |
1b43af548 [IPV6]: Increase ... |
1342 |
unsigned int h; |
c71099acc [IPV6]: Multiple ... |
1343 |
|
1b43af548 [IPV6]: Increase ... |
1344 |
rcu_read_lock(); |
a33bc5c15 xfrm: select sane... |
1345 |
for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { |
f3db48517 [NETNS][IPV6] ip6... |
1346 |
head = &net->ipv6.fib_table_hash[h]; |
58f09b78b [NETNS][IPV6] ip6... |
1347 |
hlist_for_each_entry_rcu(table, node, head, tb6_hlist) { |
c71099acc [IPV6]: Multiple ... |
1348 |
write_lock_bh(&table->tb6_lock); |
ec7d43c29 [NETNS][IPV6] ip6... |
1349 1350 |
fib6_clean_tree(net, &table->tb6_root, func, prune, arg); |
c71099acc [IPV6]: Multiple ... |
1351 1352 1353 |
write_unlock_bh(&table->tb6_lock); } } |
1b43af548 [IPV6]: Increase ... |
1354 |
rcu_read_unlock(); |
c71099acc [IPV6]: Multiple ... |
1355 |
} |
1da177e4c Linux-2.6.12-rc2 |
1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 |
static int fib6_prune_clone(struct rt6_info *rt, void *arg) { if (rt->rt6i_flags & RTF_CACHE) { RT6_TRACE("pruning clone %p ", rt); return -1; } return 0; } |
ec7d43c29 [NETNS][IPV6] ip6... |
1366 1367 |
static void fib6_prune_clones(struct net *net, struct fib6_node *fn, struct rt6_info *rt) |
1da177e4c Linux-2.6.12-rc2 |
1368 |
{ |
ec7d43c29 [NETNS][IPV6] ip6... |
1369 |
fib6_clean_tree(net, fn, fib6_prune_clone, 1, rt); |
1da177e4c Linux-2.6.12-rc2 |
1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 |
} /* * Garbage collection */ static struct fib6_gc_args { int timeout; int more; } gc_args; static int fib6_age(struct rt6_info *rt, void *arg) { unsigned long now = jiffies; /* * check addrconf expiration here. * Routes are expired even if they are in use. * * Also age clones. Note, that clones are aged out * only if they are not in use now. */ if (rt->rt6i_flags&RTF_EXPIRES && rt->rt6i_expires) { if (time_after(now, rt->rt6i_expires)) { RT6_TRACE("expiring %p ", rt); |
1da177e4c Linux-2.6.12-rc2 |
1398 1399 1400 1401 |
return -1; } gc_args.more++; } else if (rt->rt6i_flags & RTF_CACHE) { |
d8d1f30b9 net-next: remove ... |
1402 1403 |
if (atomic_read(&rt->dst.__refcnt) == 0 && time_after_eq(now, rt->dst.lastuse + gc_args.timeout)) { |
1da177e4c Linux-2.6.12-rc2 |
1404 1405 1406 1407 |
RT6_TRACE("aging clone %p ", rt); return -1; } else if ((rt->rt6i_flags & RTF_GATEWAY) && |
f2c31e32b net: fix NULL der... |
1408 |
(!(dst_get_neighbour_raw(&rt->dst)->flags & NTF_ROUTER))) { |
1da177e4c Linux-2.6.12-rc2 |
1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 |
RT6_TRACE("purging route %p via non-router but gateway ", rt); return -1; } gc_args.more++; } return 0; } static DEFINE_SPINLOCK(fib6_gc_lock); |
5b7c931df [NETNS][IPV6] ip6... |
1421 |
void fib6_run_gc(unsigned long expires, struct net *net) |
1da177e4c Linux-2.6.12-rc2 |
1422 |
{ |
5b7c931df [NETNS][IPV6] ip6... |
1423 |
if (expires != ~0UL) { |
1da177e4c Linux-2.6.12-rc2 |
1424 |
spin_lock_bh(&fib6_gc_lock); |
5b7c931df [NETNS][IPV6] ip6... |
1425 1426 |
gc_args.timeout = expires ? (int)expires : net->ipv6.sysctl.ip6_rt_gc_interval; |
1da177e4c Linux-2.6.12-rc2 |
1427 |
} else { |
a76d7345a ipv6: use spin_tr... |
1428 |
if (!spin_trylock_bh(&fib6_gc_lock)) { |
417f28bb3 netns: dont alloc... |
1429 |
mod_timer(&net->ipv6.ip6_fib_timer, jiffies + HZ); |
1da177e4c Linux-2.6.12-rc2 |
1430 1431 |
return; } |
5b7c931df [NETNS][IPV6] ip6... |
1432 |
gc_args.timeout = net->ipv6.sysctl.ip6_rt_gc_interval; |
1da177e4c Linux-2.6.12-rc2 |
1433 |
} |
1da177e4c Linux-2.6.12-rc2 |
1434 |
|
3d0f24a74 ipv6: icmp6_dst_g... |
1435 |
gc_args.more = icmp6_dst_gc(); |
f3db48517 [NETNS][IPV6] ip6... |
1436 |
|
5b7c931df [NETNS][IPV6] ip6... |
1437 |
fib6_clean_all(net, fib6_age, 0, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1438 1439 |
if (gc_args.more) |
c8a452224 ipv6: use round_j... |
1440 1441 1442 |
mod_timer(&net->ipv6.ip6_fib_timer, round_jiffies(jiffies + net->ipv6.sysctl.ip6_rt_gc_interval)); |
417f28bb3 netns: dont alloc... |
1443 1444 |
else del_timer(&net->ipv6.ip6_fib_timer); |
1da177e4c Linux-2.6.12-rc2 |
1445 1446 |
spin_unlock_bh(&fib6_gc_lock); } |
5b7c931df [NETNS][IPV6] ip6... |
1447 1448 1449 1450 |
static void fib6_gc_timer_cb(unsigned long arg) { fib6_run_gc(0, (struct net *)arg); } |
2c8c1e729 net: spread __net... |
1451 |
static int __net_init fib6_net_init(struct net *net) |
1da177e4c Linux-2.6.12-rc2 |
1452 |
{ |
10da66f75 fib: avoid false ... |
1453 |
size_t size = sizeof(struct hlist_head) * FIB6_TABLE_HASHSZ; |
417f28bb3 netns: dont alloc... |
1454 |
setup_timer(&net->ipv6.ip6_fib_timer, fib6_gc_timer_cb, (unsigned long)net); |
63152fc0d [NETNS][IPV6] ip6... |
1455 |
|
c572872f8 [NETNS][IPV6] rt6... |
1456 1457 1458 |
net->ipv6.rt6_stats = kzalloc(sizeof(*net->ipv6.rt6_stats), GFP_KERNEL); if (!net->ipv6.rt6_stats) goto out_timer; |
10da66f75 fib: avoid false ... |
1459 1460 1461 1462 |
/* Avoid false sharing : Use at least a full cache line */ size = max_t(size_t, size, L1_CACHE_BYTES); net->ipv6.fib_table_hash = kzalloc(size, GFP_KERNEL); |
58f09b78b [NETNS][IPV6] ip6... |
1463 |
if (!net->ipv6.fib_table_hash) |
c572872f8 [NETNS][IPV6] rt6... |
1464 |
goto out_rt6_stats; |
e0b85590b [NETNS][IPV6] ip6... |
1465 |
|
58f09b78b [NETNS][IPV6] ip6... |
1466 1467 1468 |
net->ipv6.fib6_main_tbl = kzalloc(sizeof(*net->ipv6.fib6_main_tbl), GFP_KERNEL); if (!net->ipv6.fib6_main_tbl) |
e0b85590b [NETNS][IPV6] ip6... |
1469 |
goto out_fib_table_hash; |
58f09b78b [NETNS][IPV6] ip6... |
1470 |
net->ipv6.fib6_main_tbl->tb6_id = RT6_TABLE_MAIN; |
8ed677896 [NETNS][IPV6] rt6... |
1471 |
net->ipv6.fib6_main_tbl->tb6_root.leaf = net->ipv6.ip6_null_entry; |
58f09b78b [NETNS][IPV6] ip6... |
1472 1473 |
net->ipv6.fib6_main_tbl->tb6_root.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; |
e0b85590b [NETNS][IPV6] ip6... |
1474 1475 |
#ifdef CONFIG_IPV6_MULTIPLE_TABLES |
58f09b78b [NETNS][IPV6] ip6... |
1476 1477 1478 |
net->ipv6.fib6_local_tbl = kzalloc(sizeof(*net->ipv6.fib6_local_tbl), GFP_KERNEL); if (!net->ipv6.fib6_local_tbl) |
e0b85590b [NETNS][IPV6] ip6... |
1479 |
goto out_fib6_main_tbl; |
58f09b78b [NETNS][IPV6] ip6... |
1480 |
net->ipv6.fib6_local_tbl->tb6_id = RT6_TABLE_LOCAL; |
8ed677896 [NETNS][IPV6] rt6... |
1481 |
net->ipv6.fib6_local_tbl->tb6_root.leaf = net->ipv6.ip6_null_entry; |
58f09b78b [NETNS][IPV6] ip6... |
1482 1483 |
net->ipv6.fib6_local_tbl->tb6_root.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; |
e0b85590b [NETNS][IPV6] ip6... |
1484 |
#endif |
58f09b78b [NETNS][IPV6] ip6... |
1485 |
fib6_tables_init(net); |
f845ab6b7 [IPV6] route6/fib... |
1486 |
|
417f28bb3 netns: dont alloc... |
1487 |
return 0; |
d63bddbe9 [IPV6]: Make fib6... |
1488 |
|
e0b85590b [NETNS][IPV6] ip6... |
1489 |
#ifdef CONFIG_IPV6_MULTIPLE_TABLES |
e0b85590b [NETNS][IPV6] ip6... |
1490 |
out_fib6_main_tbl: |
58f09b78b [NETNS][IPV6] ip6... |
1491 |
kfree(net->ipv6.fib6_main_tbl); |
e0b85590b [NETNS][IPV6] ip6... |
1492 |
#endif |
e0b85590b [NETNS][IPV6] ip6... |
1493 |
out_fib_table_hash: |
58f09b78b [NETNS][IPV6] ip6... |
1494 |
kfree(net->ipv6.fib_table_hash); |
c572872f8 [NETNS][IPV6] rt6... |
1495 1496 |
out_rt6_stats: kfree(net->ipv6.rt6_stats); |
63152fc0d [NETNS][IPV6] ip6... |
1497 |
out_timer: |
417f28bb3 netns: dont alloc... |
1498 |
return -ENOMEM; |
58f09b78b [NETNS][IPV6] ip6... |
1499 1500 1501 1502 |
} static void fib6_net_exit(struct net *net) { |
8ed677896 [NETNS][IPV6] rt6... |
1503 |
rt6_ifdown(net, NULL); |
417f28bb3 netns: dont alloc... |
1504 |
del_timer_sync(&net->ipv6.ip6_fib_timer); |
58f09b78b [NETNS][IPV6] ip6... |
1505 1506 1507 1508 1509 |
#ifdef CONFIG_IPV6_MULTIPLE_TABLES kfree(net->ipv6.fib6_local_tbl); #endif kfree(net->ipv6.fib6_main_tbl); kfree(net->ipv6.fib_table_hash); |
c572872f8 [NETNS][IPV6] rt6... |
1510 |
kfree(net->ipv6.rt6_stats); |
58f09b78b [NETNS][IPV6] ip6... |
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 |
} static struct pernet_operations fib6_net_ops = { .init = fib6_net_init, .exit = fib6_net_exit, }; int __init fib6_init(void) { int ret = -ENOMEM; |
63152fc0d [NETNS][IPV6] ip6... |
1521 |
|
58f09b78b [NETNS][IPV6] ip6... |
1522 1523 1524 1525 1526 1527 1528 1529 1530 |
fib6_node_kmem = kmem_cache_create("fib6_nodes", sizeof(struct fib6_node), 0, SLAB_HWCACHE_ALIGN, NULL); if (!fib6_node_kmem) goto out; ret = register_pernet_subsys(&fib6_net_ops); if (ret) |
c572872f8 [NETNS][IPV6] rt6... |
1531 |
goto out_kmem_cache_create; |
58f09b78b [NETNS][IPV6] ip6... |
1532 |
|
c7ac8679b rtnetlink: Comput... |
1533 1534 |
ret = __rtnl_register(PF_INET6, RTM_GETROUTE, NULL, inet6_dump_fib, NULL); |
58f09b78b [NETNS][IPV6] ip6... |
1535 1536 1537 1538 1539 1540 1541 |
if (ret) goto out_unregister_subsys; out: return ret; out_unregister_subsys: unregister_pernet_subsys(&fib6_net_ops); |
d63bddbe9 [IPV6]: Make fib6... |
1542 1543 1544 |
out_kmem_cache_create: kmem_cache_destroy(fib6_node_kmem); goto out; |
1da177e4c Linux-2.6.12-rc2 |
1545 1546 1547 1548 |
} void fib6_gc_cleanup(void) { |
58f09b78b [NETNS][IPV6] ip6... |
1549 |
unregister_pernet_subsys(&fib6_net_ops); |
1da177e4c Linux-2.6.12-rc2 |
1550 1551 |
kmem_cache_destroy(fib6_node_kmem); } |