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net/tcp: d_appdata should remove the tcp specific option field

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applicate data field should not touch data of IP layer

Signed-off-by: chao.an <anchao@xiaomi.com>
This commit is contained in:
chao.an 2021-07-22 17:01:46 +08:00 committed by Xiang Xiao
parent f6b8cc1407
commit 845e259ac7
1 changed files with 11 additions and 0 deletions
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11
net/tcp/tcp_input.c
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@ -629,6 +629,17 @@ found:
dev->d_len -= (len + iplen);
/* d_appdata should remove the tcp specific option field. */
if ((tcp->tcpoffset & 0xf0) > 0x50)
{
len = ((tcp->tcpoffset >> 4) - 5) << 2;
if (dev->d_len >= len)
{
dev->d_appdata += len;
}
}
/* Check if the sequence number of the incoming packet is what we are
* expecting next. If not, we send out an ACK with the correct numbers
* in, unless we are in the SYN_RCVD state and receive a SYN, in which