6.15-stable review patch. If anyone has any objections, please let me know.
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From: Felix Fietkau nbd@nbd.name
[ Upstream commit 9f735b6f8a77d7be7f8b0765dc93587774832cb1 ]
Since "net: gro: use cb instead of skb->network_header", the skb network header is no longer set in the GRO path. This breaks fraglist segmentation, which relies on ip_hdr()/tcp_hdr() to check for address/port changes. Fix this regression by selectively setting the network header for merged segment skbs.
Fixes: 186b1ea73ad8 ("net: gro: use cb instead of skb->network_header") Signed-off-by: Felix Fietkau nbd@nbd.name Reviewed-by: Willem de Bruijn willemb@google.com Link: https://patch.msgid.link/20250705150622.10699-1-nbd@nbd.name Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/ipv4/tcp_offload.c | 1 + net/ipv4/udp_offload.c | 1 + 2 files changed, 2 insertions(+)
diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c index d293087b426df..be5c2294610e5 100644 --- a/net/ipv4/tcp_offload.c +++ b/net/ipv4/tcp_offload.c @@ -359,6 +359,7 @@ struct sk_buff *tcp_gro_receive(struct list_head *head, struct sk_buff *skb, flush |= skb->ip_summed != p->ip_summed; flush |= skb->csum_level != p->csum_level; flush |= NAPI_GRO_CB(p)->count >= 64; + skb_set_network_header(skb, skb_gro_receive_network_offset(skb));
if (flush || skb_gro_receive_list(p, skb)) mss = 1; diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c index 9b295b2878bef..a1aca63086777 100644 --- a/net/ipv4/udp_offload.c +++ b/net/ipv4/udp_offload.c @@ -604,6 +604,7 @@ static struct sk_buff *udp_gro_receive_segment(struct list_head *head, NAPI_GRO_CB(skb)->flush = 1; return NULL; } + skb_set_network_header(skb, skb_gro_receive_network_offset(skb)); ret = skb_gro_receive_list(p, skb); } else { skb_gro_postpull_rcsum(skb, uh,