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bpf, sockmap: Fix data loss caused by using apply_bytes on ingress redirect

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Use apply_bytes on ingress redirect, when apply_bytes is less than
the length of msg data, some data may be skipped and lost in
bpf_tcp_ingress().

If there is still data in the scatterlist that has not been consumed,
we cannot move the msg iter.

Fixes: 604326b41a ("bpf, sockmap: convert to generic sk_msg interface")
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/bpf/1669718441-2654-4-git-send-email-yangpc@wangsu.com
This commit is contained in:
Pengcheng Yang 2022-11-29 18:40:40 +08:00 committed by Daniel Borkmann
parent a351d6087b
commit 9072931f02
1 changed files with 4 additions and 1 deletions
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5
net/ipv4/tcp_bpf.c
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@ -45,8 +45,11 @@ static int bpf_tcp_ingress(struct sock *sk, struct sk_psock *psock,
tmp->sg.end = i;
if (apply) {
apply_bytes -= size;
if (!apply_bytes)
if (!apply_bytes) {
if (sge->length)
sk_msg_iter_var_prev(i);
break;
}
}
} while (i != msg->sg.end);