net: tcp: use kfree_skb_reason() for tcp_v{4,6}_do_rcv()

Replace kfree_skb() used in tcp_v4_do_rcv() and tcp_v6_do_rcv() with
kfree_skb_reason().

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>

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index cbca863..d42824a 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1708,6 +1708,7 @@ INDIRECT_CALLABLE_DECLARE(struct dst_entry *ipv4_dst_check(struct dst_entry *,
  */
 int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 {
+       enum skb_drop_reason reason;
        struct sock *rsk;
 
        if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
@@ -1730,6 +1731,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
                return 0;
        }
 
+       reason = SKB_DROP_REASON_NOT_SPECIFIED;
        if (tcp_checksum_complete(skb))
                goto csum_err;
 
@@ -1757,7 +1759,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 reset:
        tcp_v4_send_reset(rsk, skb);
 discard:
-       kfree_skb(skb);
+       kfree_skb_reason(skb, reason);
        /* Be careful here. If this function gets more complicated and
         * gcc suffers from register pressure on the x86, sk (in %ebx)
         * might be destroyed here. This current version compiles correctly,
@@ -1766,6 +1768,7 @@ discard:
        return 0;
 
 csum_err:
+       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);

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index abf0ad5..91cee80 100644 (file)
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1476,6 +1476,7 @@ int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 {
        struct ipv6_pinfo *np = tcp_inet6_sk(sk);
        struct sk_buff *opt_skb = NULL;
+       enum skb_drop_reason reason;
        struct tcp_sock *tp;
 
        /* Imagine: socket is IPv6. IPv4 packet arrives,
@@ -1510,6 +1511,7 @@ int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
        if (np->rxopt.all)
                opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC));
 
+       reason = SKB_DROP_REASON_NOT_SPECIFIED;
        if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
                struct dst_entry *dst;
 
@@ -1563,9 +1565,10 @@ reset:
 discard:
        if (opt_skb)
                __kfree_skb(opt_skb);
-       kfree_skb(skb);
+       kfree_skb_reason(skb, reason);
        return 0;
 csum_err:
+       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);