iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ipv6: Handle multipath route deletion notification

Browse Source 
When an entire multipath route is deleted, only emit a notification if
it is the first route in the node. Emit a replace notification in case
the last sibling is followed by another route. Otherwise, emit a delete
notification.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2019-12-23 15:28:18 +02:00 committed by David S. Miller
parent d2f0c9b114
commit 0284696b97
1 changed files with 26 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
net/ipv6/route.c
View File

@ -3749,6 +3749,7 @@ static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) {
struct fib6_info *sibling, *next_sibling;
struct fib6_node *fn;
/* prefer to send a single notification with all hops */
skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
@ -3764,7 +3765,32 @@ static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
info->skip_notify = 1;
}
/* 'rt' points to the first sibling route. If it is not the
* leaf, then we do not need to send a notification. Otherwise,
* we need to check if the last sibling has a next route or not
* and emit a replace or delete notification, respectively.
*/
info->skip_notify_kernel = 1;
fn = rcu_dereference_protected(rt->fib6_node,
lockdep_is_held(&table->tb6_lock));
if (rcu_access_pointer(fn->leaf) == rt) {
struct fib6_info *last_sibling, *replace_rt;
last_sibling = list_last_entry(&rt->fib6_siblings,
struct fib6_info,
fib6_siblings);
replace_rt = rcu_dereference_protected(
last_sibling->fib6_next,
lockdep_is_held(&table->tb6_lock));
if (replace_rt)
call_fib6_entry_notifiers_replace(net,
replace_rt);
else
call_fib6_multipath_entry_notifiers(net,
FIB_EVENT_ENTRY_DEL_TMP,
rt, rt->fib6_nsiblings,
NULL);
}
call_fib6_multipath_entry_notifiers(net,
FIB_EVENT_ENTRY_DEL,
rt,