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-rw-r--r--include/linux/snmp.h2
-rw-r--r--net/ipv4/proc.c2
-rw-r--r--net/ipv4/tcp_ipv4.c7
-rw-r--r--net/ipv6/tcp_ipv6.c3
4 files changed, 11 insertions, 3 deletions
diff --git a/include/linux/snmp.h b/include/linux/snmp.h
index e28f5a0182e..4435d108475 100644
--- a/include/linux/snmp.h
+++ b/include/linux/snmp.h
@@ -225,6 +225,8 @@ enum
LINUX_MIB_SACKSHIFTED,
LINUX_MIB_SACKMERGED,
LINUX_MIB_SACKSHIFTFALLBACK,
+ LINUX_MIB_TCPBACKLOGDROP,
+ LINUX_MIB_TCPMINTTLDROP, /* RFC 5082 */
__LINUX_MIB_MAX
};
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 242ed230737..4f1f337f433 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -249,6 +249,8 @@ static const struct snmp_mib snmp4_net_list[] = {
SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
+ SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
+ SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
SNMP_MIB_SENTINEL
};
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 1915f7dc30e..8d51d39ad1b 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1651,8 +1651,10 @@ int tcp_v4_rcv(struct sk_buff *skb)
if (!sk)
goto no_tcp_socket;
- if (iph->ttl < inet_sk(sk)->min_ttl)
+ if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) {
+ NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
goto discard_and_relse;
+ }
process:
if (sk->sk_state == TCP_TIME_WAIT)
@@ -1682,8 +1684,9 @@ process:
if (!tcp_prequeue(sk, skb))
ret = tcp_v4_do_rcv(sk, skb);
}
- } else if (sk_add_backlog(sk, skb)) {
+ } else if (unlikely(sk_add_backlog(sk, skb))) {
bh_unlock_sock(sk);
+ NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
goto discard_and_relse;
}
bh_unlock_sock(sk);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 2c378b1bd5c..9b6dbba80d3 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1740,8 +1740,9 @@ process:
if (!tcp_prequeue(sk, skb))
ret = tcp_v6_do_rcv(sk, skb);
}
- } else if (sk_add_backlog(sk, skb)) {
+ } else if (unlikely(sk_add_backlog(sk, skb))) {
bh_unlock_sock(sk);
+ NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
goto discard_and_relse;
}
bh_unlock_sock(sk);