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kernel: Fix IPv6 UDP fragmentation regression

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Fixes a IPv6 UDP fragmentation regression introduced in v6.6.93.

Fixes: https://github.com/openwrt/openwrt/issues/19198
Link: https://github.com/openwrt/openwrt/pull/19199
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Hauke Mehrtens 2025-06-21 19:17:46 +02:00
parent a61a2a9291
commit f62c33bc4a
1 changed files with 72 additions and 0 deletions
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72
target/linux/generic/pending-6.6/650-Revert-ipv6-save-dontfrag-in-cork.patch Normal file
View file

@ -0,0 +1,72 @@
From 988e05f0c036c9c64f211b8b91a4a33c34db216a Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sat, 21 Jun 2025 19:08:30 +0200
Subject: [PATCH] Revert "ipv6: save dontfrag in cork"
This reverts commit 8ebf2709fe4dcd0a1b7b95bf61e529ddcd3cdf51.
This change breaks IPv6 UDP packet fragmentation.
See discussion: https://lore.kernel.org/stable/aFGl-mb--GOMY8ZQ@karahi.gladserv.com/
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
include/linux/ipv6.h | 1 -
net/ipv6/ip6_output.c | 9 ++++-----
2 files changed, 4 insertions(+), 6 deletions(-)
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -199,7 +199,6 @@ struct inet6_cork {
struct ipv6_txoptions *opt;
u8 hop_limit;
u8 tclass;
- u8 dontfrag:1;
};
/* struct ipv6_pinfo - ipv6 private area */
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1452,7 +1452,6 @@ static int ip6_setup_cork(struct sock *s
}
v6_cork->hop_limit = ipc6->hlimit;
v6_cork->tclass = ipc6->tclass;
- v6_cork->dontfrag = ipc6->dontfrag;
if (rt->dst.flags & DST_XFRM_TUNNEL)
mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
READ_ONCE(rt->dst.dev->mtu) : dst_mtu(&rt->dst);
@@ -1486,7 +1485,7 @@ static int __ip6_append_data(struct sock
int getfrag(void *from, char *to, int offset,
int len, int odd, struct sk_buff *skb),
void *from, size_t length, int transhdrlen,
- unsigned int flags)
+ unsigned int flags, struct ipcm6_cookie *ipc6)
{
struct sk_buff *skb, *skb_prev = NULL;
struct inet_cork *cork = &cork_full->base;
@@ -1542,7 +1541,7 @@ static int __ip6_append_data(struct sock
if (headersize + transhdrlen > mtu)
goto emsgsize;
- if (cork->length + length > mtu - headersize && v6_cork->dontfrag &&
+ if (cork->length + length > mtu - headersize && ipc6->dontfrag &&
(sk->sk_protocol == IPPROTO_UDP ||
sk->sk_protocol == IPPROTO_ICMPV6 ||
sk->sk_protocol == IPPROTO_RAW)) {
@@ -1914,7 +1913,7 @@ int ip6_append_data(struct sock *sk,
return __ip6_append_data(sk, &sk->sk_write_queue, &inet->cork,
&np->cork, sk_page_frag(sk), getfrag,
- from, length, transhdrlen, flags);
+ from, length, transhdrlen, flags, ipc6);
}
EXPORT_SYMBOL_GPL(ip6_append_data);
@@ -2119,7 +2118,7 @@ struct sk_buff *ip6_make_skb(struct sock
err = __ip6_append_data(sk, &queue, cork, &v6_cork,
&current->task_frag, getfrag, from,
length + exthdrlen, transhdrlen + exthdrlen,
- flags);
+ flags, ipc6);
if (err) {
__ip6_flush_pending_frames(sk, &queue, cork, &v6_cork);
return ERR_PTR(err);