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net: tcp: add skb drop reasons to tcp_v{4,6}_inbound_md5_hash()

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Pass the address of drop reason to tcp_v4_inbound_md5_hash() and
tcp_v6_inbound_md5_hash() to store the reasons for skb drops when this
function fails. Therefore, the drop reason can be passed to
kfree_skb_reason() when the skb needs to be freed.

Following drop reasons are added:

SKB_DROP_REASON_TCP_MD5NOTFOUND
SKB_DROP_REASON_TCP_MD5UNEXPECTED
SKB_DROP_REASON_TCP_MD5FAILURE

SKB_DROP_REASON_TCP_MD5* above correspond to LINUX_MIB_TCPMD5*

Reviewed-by: Mengen Sun <mengensun@tencent.com>
Reviewed-by: Hao Peng <flyingpeng@tencent.com>
Signed-off-by: Menglong Dong <imagedong@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Menglong Dong
2022-02-20 15:06:32 +08:00
committed by David S. Miller
parent c0e3154d9c
commit 643b622b51
4 changed files with 33 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
include/linux/skbuff.h
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@@ -346,6 +346,18 @@ enum skb_drop_reason {
* udp packet drop out of
* udp_memory_allocated.
*/
SKB_DROP_REASON_TCP_MD5NOTFOUND, /* no MD5 hash and one
* expected, corresponding
* to LINUX_MIB_TCPMD5NOTFOUND
*/
SKB_DROP_REASON_TCP_MD5UNEXPECTED, /* MD5 hash and we're not
* expecting one, corresponding
* to LINUX_MIB_TCPMD5UNEXPECTED
*/
SKB_DROP_REASON_TCP_MD5FAILURE, /* MD5 hash and its wrong,
* corresponding to
* LINUX_MIB_TCPMD5FAILURE
*/
SKB_DROP_REASON_MAX,
};