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ipv4: fib: Send notification before deleting FIB alias 

When a FIB alias is replaced following NLM_F_REPLACE, the ENTRY_ADD
notification is sent after the reference on the previous FIB info was
dropped. This is problematic as potential listeners might need to access
it in their notification blocks.

Solve this by sending the notification prior to the deletion of the
replaced FIB alias. This is consistent with ENTRY_DEL notifications.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
CC: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2017-02-09 10:28:40 +01:00 committed by David S. Miller
parent 42d5aa76ec
commit 5b7d616dbc
1 changed files with 7 additions and 7 deletions
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14
net/ipv4/fib_trie.c
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@ -1295,6 +1295,13 @@ int fib_table_insert(struct net *net, struct fib_table *tb,
new_fa->tb_id = tb->tb_id; new_fa->tb_id = tb->tb_id;
new_fa->fa_default = -1; new_fa->fa_default = -1;
call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_ADD,
key, plen, fi,
new_fa->fa_tos, cfg->fc_type,
tb->tb_id, nlflags);
rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen,
tb->tb_id, &cfg->fc_nlinfo, nlflags);
hlist_replace_rcu(&fa->fa_list, &new_fa->fa_list); hlist_replace_rcu(&fa->fa_list, &new_fa->fa_list);
alias_free_mem_rcu(fa); alias_free_mem_rcu(fa);
@ -1303,13 +1310,6 @@ int fib_table_insert(struct net *net, struct fib_table *tb,
if (state & FA_S_ACCESSED) if (state & FA_S_ACCESSED)
rt_cache_flush(cfg->fc_nlinfo.nl_net); rt_cache_flush(cfg->fc_nlinfo.nl_net);
call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_ADD,
key, plen, fi,
new_fa->fa_tos, cfg->fc_type,
tb->tb_id, cfg->fc_nlflags);
rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen,
tb->tb_id, &cfg->fc_nlinfo, nlflags);
goto succeeded; goto succeeded;
} }
/* Error if we find a perfect match which /* Error if we find a perfect match which