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authorIdo Schimmel <idosch@mellanox.com>2019-12-23 15:28:13 +0200
committerDavid S. Miller <davem@davemloft.net>2019-12-24 22:37:29 -0800
commitc10c4279c778df03f404a4d6906d7d4b840eb95f (patch)
treeaa768ad0669898767b41cda125fe165430360339 /net/ipv6/ip6_fib.c
parentnet: fib_notifier: Add temporary events to the FIB notification chain (diff)
downloadlinux-dev-c10c4279c778df03f404a4d6906d7d4b840eb95f.tar.xz
linux-dev-c10c4279c778df03f404a4d6906d7d4b840eb95f.zip
ipv6: Notify newly added route if should be offloaded
fib6_add_rt2node() takes care of adding a single route ('struct fib6_info') to a FIB node. The route in question should only be notified in case it is added as the first route in the node (lowest metric) or if it is added as a sibling route to the first route in the node. The first criterion can be tested by checking if the route is pointed to by 'fn->leaf'. The second criterion can be tested by checking the new 'notify_sibling_rt' variable that is set when the route is added as a sibling to the first route in the node. 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>
Diffstat (limited to '')
-rw-r--r--net/ipv6/ip6_fib.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 7bae6a91b487..045bcaf5e770 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1039,6 +1039,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct fib6_info *rt,
(info->nlh->nlmsg_flags & NLM_F_CREATE));
int found = 0;
bool rt_can_ecmp = rt6_qualify_for_ecmp(rt);
+ bool notify_sibling_rt = false;
u16 nlflags = NLM_F_EXCL;
int err;
@@ -1130,6 +1131,7 @@ next_iter:
/* Find the first route that have the same metric */
sibling = leaf;
+ notify_sibling_rt = true;
while (sibling) {
if (sibling->fib6_metric == rt->fib6_metric &&
rt6_qualify_for_ecmp(sibling)) {
@@ -1139,6 +1141,7 @@ next_iter:
}
sibling = rcu_dereference_protected(sibling->fib6_next,
lockdep_is_held(&rt->fib6_table->tb6_lock));
+ notify_sibling_rt = false;
}
/* For each sibling in the list, increment the counter of
* siblings. BUG() if counters does not match, list of siblings
@@ -1166,6 +1169,21 @@ add:
nlflags |= NLM_F_CREATE;
if (!info->skip_notify_kernel) {
+ enum fib_event_type fib_event;
+
+ if (notify_sibling_rt)
+ fib_event = FIB_EVENT_ENTRY_APPEND;
+ else
+ fib_event = FIB_EVENT_ENTRY_REPLACE_TMP;
+ /* The route should only be notified if it is the first
+ * route in the node or if it is added as a sibling
+ * route to the first route in the node.
+ */
+ if (notify_sibling_rt || ins == &fn->leaf)
+ err = call_fib6_entry_notifiers(info->nl_net,
+ fib_event, rt,
+ extack);
+
err = call_fib6_entry_notifiers(info->nl_net,
FIB_EVENT_ENTRY_ADD,
rt, extack);