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ipv6: Add IPv6 multipath notifications for add / replace 

Emit a notification when a multipath routes is added or replace.

Note that unlike the replace notifications sent from fib6_add_rt2node(),
it is possible we are sending a 'FIB_EVENT_ENTRY_REPLACE' when a route
was merely added and not replaced.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-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 2019-06-18 18:12:48 +03:00 committed by David S. Miller
parent d133e4f1fa
commit ebee3cad83
1 changed files with 15 additions and 0 deletions
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15
net/ipv6/route.c
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@ -4965,6 +4965,7 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
{
struct fib6_info *rt_notif = NULL, *rt_last = NULL;
struct nl_info *info = &cfg->fc_nlinfo;
enum fib_event_type event_type;
struct fib6_config r_cfg;
struct rtnexthop *rtnh;
struct fib6_info *rt;
@ -5042,6 +5043,11 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
*/
info->skip_notify = 1;
/* For add and replace, send one notification with all nexthops. For
* append, send one notification with all appended nexthops.
*/
info->skip_notify_kernel = 1;
err_nh = NULL;
list_for_each_entry(nh, &rt6_nh_list, next) {
err = __ip6_ins_rt(nh->fib6_info, info, extack);
@ -5078,6 +5084,15 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
nhn++;
}
event_type = replace ? FIB_EVENT_ENTRY_REPLACE : FIB_EVENT_ENTRY_ADD;
err = call_fib6_multipath_entry_notifiers(info->nl_net, event_type,
rt_notif, nhn - 1, extack);
if (err) {
/* Delete all the siblings that were just added */
err_nh = NULL;
goto add_errout;
}
/* success ... tell user about new route */
ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
goto cleanup;