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udp: Support BIG TCP GSO packets where they can occur

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Wherever a GSO packet can occur, and its length is used to fill the UDP
header, use udp_set_len that assigns 0 if the length doesn't fit 16
bits, so that the packet can be properly parsed and segmented later,
instead of having truncated length.

Use udp_get_len in udp_validate_len to treat BIG TCP packets as valid.

Signed-off-by: Alice Mikityanska <alice@isovalent.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260710134242.216538-4-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 842870cdfa
commit 47282504ad
5 changed files with 5 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
net/ipv4/fou_core.c
+1 -1
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@@ -1040,7 +1040,7 @@ static void fou_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e,
uh->dest = e->dport;
uh->source = sport;
udp_set_len_short(uh, skb->len);
udp_set_len(uh, skb->len);
udp_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM), skb,
fl4->saddr, fl4->daddr, skb->len);
net/ipv6/fou6.c
+1 -1
View File
@@ -30,7 +30,7 @@ static void fou6_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e,
uh->dest = e->dport;
uh->source = sport;
udp_set_len_short(uh, skb->len);
udp_set_len(uh, skb->len);
udp6_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM6), skb,
&fl6->saddr, &fl6->daddr, skb->len);
net/netfilter/ipvs/ip_vs_xmit.c
+1 -1
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@@ -1100,7 +1100,7 @@ ipvs_gue_encap(struct net *net, struct sk_buff *skb,
dport = cp->dest->tun_port;
udph->dest = dport;
udph->source = sport;
udp_set_len_short(udph, skb->len);
udp_set_len(udph, skb->len);
udph->check = 0;
*next_protocol = IPPROTO_UDP;
net/netfilter/nf_conntrack_proto_udp.c
+1 -1
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@@ -45,7 +45,7 @@ static bool udp_validate_len(struct sk_buff *skb,
const struct udphdr *hdr,
unsigned int dataoff)
{
unsigned int udplen = udp_get_len_short(hdr);
unsigned int udplen = udp_get_len(skb, hdr, dataoff);
unsigned int skblen = skb->len - dataoff;
if (udplen > skblen || udplen < sizeof(*hdr))
net/psp/psp_main.c
+1 -1
View File
@@ -231,7 +231,7 @@ static void psp_write_headers(struct net *net, struct sk_buff *skb, __be32 spi,
uh->source = udp_flow_src_port(net, skb, 0, 0, false);
}
uh->check = 0;
udp_set_len_short(uh, udp_len);
udp_set_len(uh, udp_len);
psph->nexthdr = IPPROTO_TCP;
psph->hdrlen = PSP_HDRLEN_NOOPT;