This is needed because in ndisc.c, we have:
static void ndisc_router_discovery(struct sk_buff *skb)
{
// ...
if (ndopts.nd_opts_mtu) {
// ...
if (rt)
rt->u.dst.metrics[RTAX_MTU-1] = mtu;
rt6_mtu_change(skb->dev, mtu);
// ...
}
Since the mtu is set directly here, rt6_mtu_change_route thinks that
it is unchanged, and so it fails to update the MSS accordingly. This
patch lets rt6_mtu_change_route still update MSS if old_mtu == new_mtu.
Signed-off-by: Jim Paris <[EMAIL PROTECTED]>
---
This fixes the problem I reported earlier where IPv6 autoconfiguration
ends up with mtu < advmss on the default route.
I don't know if this is the best way to fix the problem, but it works
for me. Other options: set rt->u.dst.metrics[RTAX_ADVMSS-1] directly
in ndisc_router_discovery (but ipv6_advmss function isn't available);
don't set MTU at all in ndisc_router_discovery and let rt6_mtu_change
handle it; etc.
net/ipv6/route.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 6ecb5e6..0965fb3 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1912,7 +1912,7 @@ static int rt6_mtu_change_route(struct rt6_info *rt, void
*p_arg)
*/
if (rt->rt6i_dev == arg->dev &&
!dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
- (dst_mtu(&rt->u.dst) > arg->mtu ||
+ (dst_mtu(&rt->u.dst) >= arg->mtu ||
(dst_mtu(&rt->u.dst) < arg->mtu &&
dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) {
rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
--
1.5.3.8
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