5.10-stable review patch. If anyone has any objections, please let me know.
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From: Brett A C Sheffield (Librecast) bacs@librecast.net
This reverts commit 29533d1a54b8de5aaf8c4aa6790dc67d5c14fba5 which is commit a18dfa9925b9ef6107ea3aa5814ca3c704d34a8a upstream.
A regression was introduced when backporting this to the stable kernels without applying previous commits in this series.
When sending IPv6 UDP packets larger than MTU, EMSGSIZE was returned instead of fragmenting the packets as expected.
As there is no compelling reason for this commit to be present in the stable kernels it should be reverted.
Signed-off-by: Brett A C Sheffield bacs@librecast.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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 @@ -189,7 +189,6 @@ struct inet6_cork { struct ipv6_txoptions *opt; u8 hop_limit; u8 tclass; - u8 dontfrag:1; };
/** --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -1416,7 +1416,6 @@ static int ip6_setup_cork(struct sock *s cork->fl.u.ip6 = *fl6; 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); @@ -1451,7 +1450,7 @@ 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; unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu, pmtu; @@ -1508,7 +1507,7 @@ 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_RAW)) { ipv6_local_rxpmtu(sk, fl6, mtu - headersize + @@ -1826,7 +1825,7 @@ int ip6_append_data(struct sock *sk,
return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base, &np->cork, sk_page_frag(sk), getfrag, - from, length, transhdrlen, flags); + from, length, transhdrlen, flags, ipc6); } EXPORT_SYMBOL_GPL(ip6_append_data);
@@ -2021,7 +2020,7 @@ struct sk_buff *ip6_make_skb(struct sock err = __ip6_append_data(sk, fl6, &queue, &cork->base, &v6_cork, ¤t->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);