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bpf/progs/offload.c: disable ipv6 offload for non-gso >pmtu

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Bug: 263884894
Bug: 419747540
Test: TreeHugger
Flag: EXEMPT mainline
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Idecc355084220ea5c53924c720c806adab153b5d
This commit is contained in:
Maciej Żenczykowski 2025-06-02 01:13:06 -07:00
commit 5d79fdffd3
2 changed files with 4 additions and 0 deletions
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3
bpf/progs/offload.c
View file

@ -178,6 +178,9 @@ static inline __always_inline int do_forward6(struct __sk_buff* skb,
uint64_t packets = 1;
uint64_t L3_bytes = skb->len - l2_header_size;
if (L3_bytes > v->pmtu) {
if (KVER_IS_AT_LEAST(kver, 5, 4, 0)) {
if (skb->gso_segs <= 1) TC_PUNT(ABOVE_IPV6_PMTU);
}
const int tcp6_overhead = sizeof(struct ipv6hdr) + sizeof(struct tcphdr) + 12;
const int mss = v->pmtu - tcp6_overhead;
const uint64_t payload = L3_bytes - tcp6_overhead;

1
bpf/progs/offload.h
View file

@ -41,6 +41,7 @@
ERR(BELOW_IPV4_MTU) \
ERR(ABOVE_IPV4_PMTU) \
ERR(BELOW_IPV6_MTU) \
ERR(ABOVE_IPV6_PMTU) \
ERR(LIMIT_REACHED) \
ERR(CHANGE_HEAD_FAILED) \
ERR(TOO_SHORT) \