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authorSteffen Klassert <steffen.klassert@secunet.com>2015-05-29 11:28:26 -0700
committerDavid S. Miller <davem@davemloft.net>2015-06-01 16:03:43 -0700
commitccd740cbc6e01b2a08baa341867063ed2887f4b9 (patch)
tree3a0e80328b82f33c3c853ef07e388a1a50c0e3b4 /net/ipv6
parent18ec898ee54e03a9aab8b54db50cb2b36209d313 (diff)
vti6: Add pmtu handling to vti6_xmit.
We currently rely on the PMTU discovery of xfrm. However if a packet is localy sent, the PMTU mechanism of xfrm tries to to local socket notification what might not work for applications like ping that don't check for this. So add pmtu handling to vti6_xmit to report MTU changes immediately. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/ip6_vti.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
index ff3bd863fa03..0224c032dca5 100644
--- a/net/ipv6/ip6_vti.c
+++ b/net/ipv6/ip6_vti.c
@@ -435,6 +435,7 @@ vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
struct net_device *tdev;
struct xfrm_state *x;
int err = -1;
+ int mtu;
if (!dst)
goto tx_err_link_failure;
@@ -468,6 +469,19 @@ vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
skb_dst_set(skb, dst);
skb->dev = skb_dst(skb)->dev;
+ mtu = dst_mtu(dst);
+ if (!skb->ignore_df && skb->len > mtu) {
+ skb_dst(skb)->ops->update_pmtu(dst, NULL, skb, mtu);
+
+ if (skb->protocol == htons(ETH_P_IPV6))
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ else
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
+ htonl(mtu));
+
+ return -EMSGSIZE;
+ }
+
err = dst_output(skb);
if (net_xmit_eval(err) == 0) {
struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);

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