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gtp: fix fragmentation needed check with gso

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[ Upstream commit 4530e5b8e2 ]

Call skb_gso_validate_network_len() to check if packet is over PMTU.

Fixes: 459aa660eb ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pablo Neira Ayuso 2023-10-22 22:25:18 +02:00 committed by Greg Kroah-Hartman
parent 039a050740
commit 144f93c622
1 changed files with 3 additions and 2 deletions
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5
drivers/net/gtp.c
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@ -871,8 +871,9 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
skb_dst_update_pmtu_no_confirm(skb, mtu);
if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) &&
mtu < ntohs(iph->tot_len)) {
if (iph->frag_off & htons(IP_DF) &&
((!skb_is_gso(skb) && skb->len > mtu) ||
(skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu)))) {
netdev_dbg(dev, "packet too big, fragmentation needed\n");
icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
htonl(mtu));