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net: tcp: use tcp_drop_reason() for tcp_rcv_established() 

Replace tcp_drop() used in tcp_rcv_established() with tcp_drop_reason().
Following drop reasons are added:

SKB_DROP_REASON_TCP_FLAGS

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 15:06:35 +08:00 committed by David S. Miller
parent 8eba65fa5f
commit 2a968ef60e
3 changed files with 9 additions and 2 deletions
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1
include/linux/skbuff.h
View File

@ -362,6 +362,7 @@ enum skb_drop_reason {
* backlog (see
* LINUX_MIB_TCPBACKLOGDROP)
*/
SKB_DROP_REASON_TCP_FLAGS, /* TCP flags invalid */
SKB_DROP_REASON_MAX,
};

1
include/trace/events/skb.h
View File

@ -32,6 +32,7 @@
TCP_MD5UNEXPECTED) \
EM(SKB_DROP_REASON_TCP_MD5FAILURE, TCP_MD5FAILURE) \
EM(SKB_DROP_REASON_SOCKET_BACKLOG, SOCKET_BACKLOG) \
EM(SKB_DROP_REASON_TCP_FLAGS, TCP_FLAGS) \
EMe(SKB_DROP_REASON_MAX, MAX)
#undef EM

9
net/ipv4/tcp_input.c
View File

@ -5787,6 +5787,7 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
*/
void tcp_rcv_established(struct sock *sk, struct sk_buff *skb)
{
enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED;
const struct tcphdr *th = (const struct tcphdr *)skb->data;
struct tcp_sock *tp = tcp_sk(sk);
unsigned int len = skb->len;
@ -5875,6 +5876,7 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb)
tp->rcv_rtt_last_tsecr = tp->rx_opt.rcv_tsecr;
return;
} else { /* Header too small */
reason = SKB_DROP_REASON_PKT_TOO_SMALL;
TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS);
goto discard;
}
@ -5930,8 +5932,10 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb)
if (len < (th->doff << 2) || tcp_checksum_complete(skb))
goto csum_error;
if (!th->ack && !th->rst && !th->syn)
if (!th->ack && !th->rst && !th->syn) {
reason = SKB_DROP_REASON_TCP_FLAGS;
goto discard;
}
/*
* Standard slow path.
@ -5957,12 +5961,13 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb)
return;
csum_error:
reason = SKB_DROP_REASON_TCP_CSUM;
trace_tcp_bad_csum(skb);
TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS);
TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS);
discard:
tcp_drop(sk, skb);
tcp_drop_reason(sk, skb, reason);
}
EXPORT_SYMBOL(tcp_rcv_established);