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authorEric Dumazet <eric.dumazet@gmail.com>2011-08-30 03:21:44 +0000
committerDavid S. Miller <davem@davemloft.net>2011-09-15 14:49:43 -0400
commit946cedccbd7387488d2cee5da92cdfeb28d2e670 (patch)
treefbb0d9c8dc11d6efee64e2a077a4951831932058 /include
parent27e95a8c670e0c587990ec5b9a87a7ea17873d28 (diff)
tcp: Change possible SYN flooding messages
"Possible SYN flooding on port xxxx " messages can fill logs on servers. Change logic to log the message only once per listener, and add two new SNMP counters to track : TCPReqQFullDoCookies : number of times a SYNCOOKIE was replied to client TCPReqQFullDrop : number of times a SYN request was dropped because syncookies were not enabled. Based on a prior patch from Tom Herbert, and suggestions from David. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/snmp.h2
-rw-r--r--include/net/request_sock.h3
-rw-r--r--include/net/tcp.h3
3 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/snmp.h b/include/linux/snmp.h
index 12b2b18e50c..e16557a357e 100644
--- a/include/linux/snmp.h
+++ b/include/linux/snmp.h
@@ -231,6 +231,8 @@ enum
LINUX_MIB_TCPDEFERACCEPTDROP,
LINUX_MIB_IPRPFILTER, /* IP Reverse Path Filter (rp_filter) */
LINUX_MIB_TCPTIMEWAITOVERFLOW, /* TCPTimeWaitOverflow */
+ LINUX_MIB_TCPREQQFULLDOCOOKIES, /* TCPReqQFullDoCookies */
+ LINUX_MIB_TCPREQQFULLDROP, /* TCPReqQFullDrop */
__LINUX_MIB_MAX
};
diff --git a/include/net/request_sock.h b/include/net/request_sock.h
index 99e6e19b57c..4c0766e201e 100644
--- a/include/net/request_sock.h
+++ b/include/net/request_sock.h
@@ -96,7 +96,8 @@ extern int sysctl_max_syn_backlog;
*/
struct listen_sock {
u8 max_qlen_log;
- /* 3 bytes hole, try to use */
+ u8 synflood_warned;
+ /* 2 bytes hole, try to use */
int qlen;
int qlen_young;
int clock_hand;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 149a415d1e0..e9b48b09468 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -460,6 +460,9 @@ extern int tcp_write_wakeup(struct sock *);
extern void tcp_send_fin(struct sock *sk);
extern void tcp_send_active_reset(struct sock *sk, gfp_t priority);
extern int tcp_send_synack(struct sock *);
+extern int tcp_syn_flood_action(struct sock *sk,
+ const struct sk_buff *skb,
+ const char *proto);
extern void tcp_push_one(struct sock *, unsigned int mss_now);
extern void tcp_send_ack(struct sock *sk);
extern void tcp_send_delayed_ack(struct sock *sk);