Commit 590e3f79 authored by Jesper Dangaard Brouer's avatar Jesper Dangaard Brouer Committed by Pablo Neira Ayuso
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ipvs: IPv6 MTU checking cleanup and bugfix



Cleaning up the IPv6 MTU checking in the IPVS xmit code, by using
a common helper function __mtu_check_toobig_v6().

The MTU check for tunnel mode can also use this helper as
ntohs(old_iph->payload_len) + sizeof(struct ipv6hdr) is qual to
skb->len.  And the 'mtu' variable have been adjusted before
calling helper.

Notice, this also fixes a bug, as the the MTU check in ip_vs_dr_xmit_v6()
were missing a check for skb_is_gso().

This bug e.g. caused issues for KVM IPVS setups, where different
Segmentation Offloading techniques are utilized, between guests,
via the virtio driver.  This resulted in very bad performance,
due to the ICMPv6 "too big" messages didn't affect the sender.
Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 5f2d04f1
......@@ -85,6 +85,15 @@ __ip_vs_dst_check(struct ip_vs_dest *dest, u32 rtos)
return dst;
}
static inline bool
__mtu_check_toobig_v6(const struct sk_buff *skb, u32 mtu)
{
if (skb->len > mtu && !skb_is_gso(skb)) {
return true; /* Packet size violate MTU size */
}
return false;
}
/* Get route to daddr, update *saddr, optionally bind route to saddr */
static struct rtable *do_output_route4(struct net *net, __be32 daddr,
u32 rtos, int rt_mode, __be32 *saddr)
......@@ -491,7 +500,7 @@ ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
/* MTU checking */
mtu = dst_mtu(&rt->dst);
if (skb->len > mtu && !skb_is_gso(skb)) {
if (__mtu_check_toobig_v6(skb, mtu)) {
if (!skb->dev) {
struct net *net = dev_net(skb_dst(skb)->dev);
......@@ -712,7 +721,7 @@ ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
/* MTU checking */
mtu = dst_mtu(&rt->dst);
if (skb->len > mtu && !skb_is_gso(skb)) {
if (__mtu_check_toobig_v6(skb, mtu)) {
if (!skb->dev) {
struct net *net = dev_net(skb_dst(skb)->dev);
......@@ -946,8 +955,8 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
if (skb_dst(skb))
skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
if (mtu < ntohs(old_iph->payload_len) + sizeof(struct ipv6hdr) &&
!skb_is_gso(skb)) {
/* MTU checking: Notice that 'mtu' have been adjusted before hand */
if (__mtu_check_toobig_v6(skb, mtu)) {
if (!skb->dev) {
struct net *net = dev_net(skb_dst(skb)->dev);
......@@ -1113,7 +1122,7 @@ ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
/* MTU checking */
mtu = dst_mtu(&rt->dst);
if (skb->len > mtu) {
if (__mtu_check_toobig_v6(skb, mtu)) {
if (!skb->dev) {
struct net *net = dev_net(skb_dst(skb)->dev);
......@@ -1349,7 +1358,7 @@ ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
/* MTU checking */
mtu = dst_mtu(&rt->dst);
if (skb->len > mtu && !skb_is_gso(skb)) {
if (__mtu_check_toobig_v6(skb, mtu)) {
if (!skb->dev) {
struct net *net = dev_net(skb_dst(skb)->dev);
......
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