Since commit 37a1d3611c12 ("ipv6: include NLM_F_REPLACE in route
replace notifications"), RTM_NEWROUTE notifications have their
NLM_F_REPLACE flag set if the new route replaced a preexisting one.
However, other flags aren't set.
This patch reports the missing NLM_F_CREATE and NLM_F_EXCL flag bits.
NLM_F_APPEND is not reported, because in ipv6 a NLM_F_CREATE request
is interpreted as an append request (contrary to ipv4, "prepend" is not
supported, so if NLM_F_EXCL is not set then NLM_F_APPEND is implicit).
As a result, the possible flag combination can now be reported
(iproute2's terminology into parentheses):
* NLM_F_CREATE | NLM_F_EXCL: route didn't exist, exclusive creation
("add").
* NLM_F_CREATE: route did already exist, new route added after
preexisting ones ("append").
* NLM_F_REPLACE: route did already exist, new route replaced the
first preexisting one ("change").
Signed-off-by: Guillaume Nault <g.na...@alphalink.fr>
---
net/ipv6/ip6_fib.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 771be1f..ef54852 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -743,6 +743,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct
rt6_info *rt,
(info->nlh->nlmsg_flags & NLM_F_CREATE));
int found = 0;
bool rt_can_ecmp = rt6_qualify_for_ecmp(rt);
+ u16 nlflags = NLM_F_EXCL;
int err;
ins = &fn->leaf;
@@ -759,6 +760,8 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct
rt6_info *rt,
if (info->nlh &&
(info->nlh->nlmsg_flags & NLM_F_EXCL))
return -EEXIST;
+
+ nlflags &= ~NLM_F_EXCL;
if (replace) {
if (rt_can_ecmp == rt6_qualify_for_ecmp(iter)) {
found++;
@@ -856,6 +859,7 @@ next_iter:
pr_warn("NLM_F_CREATE should be set when creating new
route\n");
add:
+ nlflags |= NLM_F_CREATE;
err = fib6_commit_metrics(&rt->dst, mxc);
if (err)
return err;
@@ -864,7 +868,7 @@ add:
*ins = rt;
rt->rt6i_node = fn;
atomic_inc(&rt->rt6i_ref);
- inet6_rt_notify(RTM_NEWROUTE, rt, info, 0);
+ inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
info->nl_net->ipv6.rt6_stats->fib_rt_entries++;
if (!(fn->fn_flags & RTN_RTINFO)) {
--
2.9.3
