From: Dongseok Yi <dseok.yi@samsung.com>
To: bpf@vger.kernel.org
Cc: Dongseok Yi <dseok.yi@samsung.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH bpf] bpf: check for data_len before upgrading mss when 6 to 4
Date: Thu, 29 Apr 2021 19:08:23 +0900 [thread overview]
Message-ID: <1619690903-1138-1-git-send-email-dseok.yi@samsung.com> (raw)
In-Reply-To: CGME20210429102143epcas2p4c8747c09a9de28f003c20389c050394a@epcas2p4.samsung.com
tcp_gso_segment check for the size of GROed payload if it is bigger
than the mss. bpf_skb_proto_6_to_4 increases mss, but the mss can be
bigger than the size of GROed payload unexpectedly if data_len is not
big enough.
Assume that skb gso_size = 1372 and data_len = 8. bpf_skb_proto_6_to_4
would increse the gso_size to 1392. tcp_gso_segment will get an error
with 1380 <= 1392.
Check for the size of GROed payload if it is really bigger than target
mss when increase mss.
Fixes: 6578171a7ff0 (bpf: add bpf_skb_change_proto helper)
Signed-off-by: Dongseok Yi <dseok.yi@samsung.com>
---
net/core/filter.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/core/filter.c b/net/core/filter.c
index 9323d34..3f79e3c 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3308,7 +3308,9 @@ static int bpf_skb_proto_6_to_4(struct sk_buff *skb)
}
/* Due to IPv4 header, MSS can be upgraded. */
- skb_increase_gso_size(shinfo, len_diff);
+ if (skb->data_len > len_diff)
+ skb_increase_gso_size(shinfo, len_diff);
+
/* Header must be checked, and gso_segs recomputed. */
shinfo->gso_type |= SKB_GSO_DODGY;
shinfo->gso_segs = 0;
--
2.7.4
next parent reply other threads:[~2021-04-29 10:21 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20210429102143epcas2p4c8747c09a9de28f003c20389c050394a@epcas2p4.samsung.com>
2021-04-29 10:08 ` Dongseok Yi [this message]
2021-05-05 20:55 ` [PATCH bpf] bpf: check for data_len before upgrading mss when 6 to 4 Daniel Borkmann
2021-05-06 0:45 ` Dongseok Yi
2021-05-06 1:45 ` Willem de Bruijn
2021-05-06 2:27 ` Dongseok Yi
2021-05-06 18:21 ` Willem de Bruijn
2021-05-07 0:53 ` Dongseok Yi
2021-05-07 1:25 ` Willem de Bruijn
2021-05-07 1:45 ` Yunsheng Lin
2021-05-07 1:53 ` Willem de Bruijn
2021-05-07 8:25 ` Dongseok Yi
2021-05-07 9:11 ` Yunsheng Lin
2021-05-07 10:36 ` Dongseok Yi
2021-05-07 13:50 ` Willem de Bruijn
2021-05-10 2:22 ` Dongseok Yi
2021-05-10 13:19 ` Willem de Bruijn
2021-05-10 13:46 ` Willem de Bruijn
2021-05-11 1:11 ` Dongseok Yi
2021-05-11 17:38 ` Willem de Bruijn
2021-05-12 0:45 ` Dongseok Yi
[not found] ` <CGME20210511065056epcas2p1788505019deb274f5c57650a2f5d7ef0@epcas2p1.samsung.com>
2021-05-11 6:36 ` [PATCH bpf v2] bpf: check BPF_F_ADJ_ROOM_FIXED_GSO when upgrading mss in " Dongseok Yi
2021-05-11 17:42 ` Willem de Bruijn
2021-05-12 6:56 ` Dongseok Yi
[not found] ` <CGME20210512074058epcas2p35536c27bdfafaa6431e164c142007f96@epcas2p3.samsung.com>
2021-05-12 7:27 ` [PATCH bpf-next v3] bpf: check for BPF_F_ADJ_ROOM_FIXED_GSO when bpf_skb_change_proto Dongseok Yi
2021-05-12 14:13 ` Willem de Bruijn
2021-05-18 20:10 ` patchwork-bot+netdevbpf
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