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udp: Set length in UDP header to 0 for big GSO packets

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skb->len may be bigger than 65535 in UDP-based tunnels that have BIG TCP
enabled. If GSO aggregates packets that large, set the length in the UDP
header to 0, so that tcpdump can print such packets properly (treating
them as RFC 2675 jumbograms). Later in the pipeline, __udp_gso_segment
will set uh->len to the size of individual packets.

Signed-off-by: Alice Mikityanska <alice@isovalent.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260710134242.216538-7-alice.kernel@fastmail.im
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Alice Mikityanska
2026-07-22 13:47:02 +02:00
committed by Paolo Abeni
parent 8475a3efe6
commit 99ad245162
2 changed files with 2 additions and 2 deletions
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net/ipv4/udp_tunnel_core.c
+1 -1
View File
@@ -178,7 +178,7 @@ void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb
uh->dest = dst_port;
uh->source = src_port;
udp_set_len_short(uh, skb->len);
udp_set_len(uh, skb->len);
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
net/ipv6/ip6_udp_tunnel.c
+1 -1
View File
@@ -93,7 +93,7 @@ void udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
uh->dest = dst_port;
uh->source = src_port;
udp_set_len_short(uh, skb->len);
udp_set_len(uh, skb->len);
skb_dst_set(skb, dst);