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ip6_tunnel: Fix broken GRO

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GRO code checks for matching layer 2 headers to see, if packet belongs
to the same flow and because ip6 tunnel set dev->hard_header_len
this check fails in cases, where it shouldn't. To fix this don't
set hard_header_len, but use needed_headroom like ipv4/ip_tunnel.c
does.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Link: https://patch.msgid.link/20240815151419.109864-1-tbogendoerfer@suse.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Thomas Bogendoerfer 2024-08-15 17:14:16 +02:00 committed by Paolo Abeni
parent 807067bf01
commit 4b3e33fcc3
1 changed files with 7 additions and 5 deletions
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12
net/ipv6/ip6_tunnel.c
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@ -1507,7 +1507,8 @@ static void ip6_tnl_link_config(struct ip6_tnl *t)
tdev = __dev_get_by_index(t->net, p->link);
if (tdev) {
dev->hard_header_len = tdev->hard_header_len + t_hlen;
dev->needed_headroom = tdev->hard_header_len +
tdev->needed_headroom + t_hlen;
mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU);
mtu = mtu - t_hlen;
@ -1731,7 +1732,9 @@ ip6_tnl_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
{
struct ip6_tnl *tnl = netdev_priv(dev);
int t_hlen;
t_hlen = tnl->hlen + sizeof(struct ipv6hdr);
if (tnl->parms.proto == IPPROTO_IPV6) {
if (new_mtu < IPV6_MIN_MTU)
return -EINVAL;
@ -1740,10 +1743,10 @@ int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
return -EINVAL;
}
if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
if (new_mtu > IP6_MAX_MTU - dev->hard_header_len - t_hlen)
return -EINVAL;
} else {
if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
if (new_mtu > IP_MAX_MTU - dev->hard_header_len - t_hlen)
return -EINVAL;
}
WRITE_ONCE(dev->mtu, new_mtu);
@ -1887,12 +1890,11 @@ ip6_tnl_dev_init_gen(struct net_device *dev)
t_hlen = t->hlen + sizeof(struct ipv6hdr);
dev->type = ARPHRD_TUNNEL6;
dev->hard_header_len = LL_MAX_HEADER + t_hlen;
dev->mtu = ETH_DATA_LEN - t_hlen;
if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
dev->mtu -= 8;
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len - t_hlen;
netdev_hold(dev, &t->dev_tracker, GFP_KERNEL);
netdev_lockdep_set_classes(dev);