diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h index c0368db6df54..f0109b973648 100644 --- a/include/net/netns/ipv6.h +++ b/include/net/netns/ipv6.h @@ -58,7 +58,9 @@ struct netns_ipv6 { struct timer_list ip6_fib_timer; struct hlist_head *fib_table_hash; struct fib6_table *fib6_main_tbl; + struct list_head fib6_walkers; struct dst_ops ip6_dst_ops; + rwlock_t fib6_walker_lock; unsigned int ip6_rt_gc_expire; unsigned long ip6_rt_last_gc; #ifdef CONFIG_IPV6_MULTIPLE_TABLES diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c index d7c715accac9..883f2836beab 100644 --- a/net/ipv6/ip6_fib.c +++ b/net/ipv6/ip6_fib.c @@ -55,8 +55,6 @@ struct fib6_cleaner { void *arg; }; -static DEFINE_RWLOCK(fib6_walker_lock); - #ifdef CONFIG_IPV6_SUBTREES #define FWS_INIT FWS_S #else @@ -66,7 +64,7 @@ static DEFINE_RWLOCK(fib6_walker_lock); static void fib6_prune_clones(struct net *net, struct fib6_node *fn); 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); -static int fib6_walk(struct fib6_walker *w); +static int fib6_walk(struct net *net, struct fib6_walker *w); static int fib6_walk_continue(struct fib6_walker *w); /* @@ -78,21 +76,21 @@ static int fib6_walk_continue(struct fib6_walker *w); static void fib6_gc_timer_cb(unsigned long arg); -static LIST_HEAD(fib6_walkers); -#define FOR_WALKERS(w) list_for_each_entry(w, &fib6_walkers, lh) +#define FOR_WALKERS(net, w) \ + list_for_each_entry(w, &(net)->ipv6.fib6_walkers, lh) -static void fib6_walker_link(struct fib6_walker *w) +static void fib6_walker_link(struct net *net, struct fib6_walker *w) { - write_lock_bh(&fib6_walker_lock); - list_add(&w->lh, &fib6_walkers); - write_unlock_bh(&fib6_walker_lock); + write_lock_bh(&net->ipv6.fib6_walker_lock); + list_add(&w->lh, &net->ipv6.fib6_walkers); + write_unlock_bh(&net->ipv6.fib6_walker_lock); } -static void fib6_walker_unlink(struct fib6_walker *w) +static void fib6_walker_unlink(struct net *net, struct fib6_walker *w) { - write_lock_bh(&fib6_walker_lock); + write_lock_bh(&net->ipv6.fib6_walker_lock); list_del(&w->lh); - write_unlock_bh(&fib6_walker_lock); + write_unlock_bh(&net->ipv6.fib6_walker_lock); } static int fib6_new_sernum(struct net *net) @@ -325,12 +323,13 @@ static int fib6_dump_node(struct fib6_walker *w) static void fib6_dump_end(struct netlink_callback *cb) { + struct net *net = sock_net(cb->skb->sk); struct fib6_walker *w = (void *)cb->args[2]; if (w) { if (cb->args[4]) { cb->args[4] = 0; - fib6_walker_unlink(w); + fib6_walker_unlink(net, w); } cb->args[2] = 0; kfree(w); @@ -348,6 +347,7 @@ static int fib6_dump_done(struct netlink_callback *cb) static int fib6_dump_table(struct fib6_table *table, struct sk_buff *skb, struct netlink_callback *cb) { + struct net *net = sock_net(skb->sk); struct fib6_walker *w; int res; @@ -359,7 +359,7 @@ static int fib6_dump_table(struct fib6_table *table, struct sk_buff *skb, w->skip = 0; read_lock_bh(&table->tb6_lock); - res = fib6_walk(w); + res = fib6_walk(net, w); read_unlock_bh(&table->tb6_lock); if (res > 0) { cb->args[4] = 1; @@ -379,7 +379,7 @@ static int fib6_dump_table(struct fib6_table *table, struct sk_buff *skb, res = fib6_walk_continue(w); read_unlock_bh(&table->tb6_lock); if (res <= 0) { - fib6_walker_unlink(w); + fib6_walker_unlink(net, w); cb->args[4] = 0; } } @@ -1340,8 +1340,8 @@ static struct fib6_node *fib6_repair_tree(struct net *net, } #endif - read_lock(&fib6_walker_lock); - FOR_WALKERS(w) { + read_lock(&net->ipv6.fib6_walker_lock); + FOR_WALKERS(net, w) { if (!child) { if (w->root == fn) { w->root = w->node = NULL; @@ -1368,7 +1368,7 @@ static struct fib6_node *fib6_repair_tree(struct net *net, } } } - read_unlock(&fib6_walker_lock); + read_unlock(&net->ipv6.fib6_walker_lock); node_free(fn); if (pn->fn_flags & RTN_RTINFO || FIB6_SUBTREE(pn)) @@ -1411,8 +1411,8 @@ static void fib6_del_route(struct fib6_node *fn, struct rt6_info **rtp, } /* Adjust walkers */ - read_lock(&fib6_walker_lock); - FOR_WALKERS(w) { + read_lock(&net->ipv6.fib6_walker_lock); + FOR_WALKERS(net, w) { if (w->state == FWS_C && w->leaf == rt) { RT6_TRACE("walker %p adjusted by delroute\n", w); w->leaf = rt->dst.rt6_next; @@ -1420,7 +1420,7 @@ static void fib6_del_route(struct fib6_node *fn, struct rt6_info **rtp, w->state = FWS_U; } } - read_unlock(&fib6_walker_lock); + read_unlock(&net->ipv6.fib6_walker_lock); rt->dst.rt6_next = NULL; @@ -1588,17 +1588,17 @@ skip: } } -static int fib6_walk(struct fib6_walker *w) +static int fib6_walk(struct net *net, struct fib6_walker *w) { int res; w->state = FWS_INIT; w->node = w->root; - fib6_walker_link(w); + fib6_walker_link(net, w); res = fib6_walk_continue(w); if (res <= 0) - fib6_walker_unlink(w); + fib6_walker_unlink(net, w); return res; } @@ -1668,7 +1668,7 @@ static void fib6_clean_tree(struct net *net, struct fib6_node *root, c.arg = arg; c.net = net; - fib6_walk(&c.w); + fib6_walk(net, &c.w); } static void __fib6_clean_all(struct net *net, @@ -1816,6 +1816,8 @@ static int __net_init fib6_net_init(struct net *net) { size_t size = sizeof(struct hlist_head) * FIB6_TABLE_HASHSZ; + rwlock_init(&net->ipv6.fib6_walker_lock); + INIT_LIST_HEAD(&net->ipv6.fib6_walkers); setup_timer(&net->ipv6.ip6_fib_timer, fib6_gc_timer_cb, (unsigned long)net); net->ipv6.rt6_stats = kzalloc(sizeof(*net->ipv6.rt6_stats), GFP_KERNEL); @@ -1976,7 +1978,8 @@ static int ipv6_route_yield(struct fib6_walker *w) return 0; } -static void ipv6_route_seq_setup_walk(struct ipv6_route_iter *iter) +static void ipv6_route_seq_setup_walk(struct ipv6_route_iter *iter, + struct net *net) { memset(&iter->w, 0, sizeof(iter->w)); iter->w.func = ipv6_route_yield; @@ -1986,7 +1989,7 @@ static void ipv6_route_seq_setup_walk(struct ipv6_route_iter *iter) iter->w.args = iter; iter->sernum = iter->w.root->fn_sernum; INIT_LIST_HEAD(&iter->w.lh); - fib6_walker_link(&iter->w); + fib6_walker_link(net, &iter->w); } static struct fib6_table *ipv6_route_seq_next_table(struct fib6_table *tbl, @@ -2047,16 +2050,16 @@ iter_table: ++*pos; return iter->w.leaf; } else if (r < 0) { - fib6_walker_unlink(&iter->w); + fib6_walker_unlink(net, &iter->w); return NULL; } - fib6_walker_unlink(&iter->w); + fib6_walker_unlink(net, &iter->w); iter->tbl = ipv6_route_seq_next_table(iter->tbl, net); if (!iter->tbl) return NULL; - ipv6_route_seq_setup_walk(iter); + ipv6_route_seq_setup_walk(iter, net); goto iter_table; } @@ -2071,7 +2074,7 @@ static void *ipv6_route_seq_start(struct seq_file *seq, loff_t *pos) iter->skip = *pos; if (iter->tbl) { - ipv6_route_seq_setup_walk(iter); + ipv6_route_seq_setup_walk(iter, net); return ipv6_route_seq_next(seq, NULL, pos); } else { return NULL; @@ -2087,10 +2090,11 @@ static bool ipv6_route_iter_active(struct ipv6_route_iter *iter) static void ipv6_route_seq_stop(struct seq_file *seq, void *v) __releases(RCU_BH) { + struct net *net = seq_file_net(seq); struct ipv6_route_iter *iter = seq->private; if (ipv6_route_iter_active(iter)) - fib6_walker_unlink(&iter->w); + fib6_walker_unlink(net, &iter->w); rcu_read_unlock_bh(); }