From be8d1bbb926c84c7aec9b0b630c27ca13e9817b7 Mon Sep 17 00:00:00 2001
From: tuexen <tuexen@FreeBSD.org>
Date: Mon, 18 Jun 2012 17:11:24 +0000
Subject: [PATCH] Add rate limitation for SCTP OOTB responses.

MFC after: 3 days
---
 sys/netinet/icmp_var.h   | 3 ++-
 sys/netinet/ip_icmp.c    | 3 ++-
 sys/netinet/sctp_input.c | 9 +--------
 3 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/sys/netinet/icmp_var.h b/sys/netinet/icmp_var.h
index 30da6a262421..d939cc2e6d85 100644
--- a/sys/netinet/icmp_var.h
+++ b/sys/netinet/icmp_var.h
@@ -102,7 +102,8 @@ extern int badport_bandlim(int);
 #define BANDLIM_RST_CLOSEDPORT 3 /* No connection, and no listeners */
 #define BANDLIM_RST_OPENPORT 4   /* No connection, listener */
 #define BANDLIM_ICMP6_UNREACH 5
-#define BANDLIM_MAX 5
+#define BANDLIM_SCTP_OOTB 6
+#define BANDLIM_MAX 6
 #endif
 
 #endif
diff --git a/sys/netinet/ip_icmp.c b/sys/netinet/ip_icmp.c
index 55c28b2bfc22..3260197e7a2a 100644
--- a/sys/netinet/ip_icmp.c
+++ b/sys/netinet/ip_icmp.c
@@ -965,7 +965,8 @@ badport_bandlim(int which)
 		{ "icmp tstamp response" },
 		{ "closed port RST response" },
 		{ "open port RST response" },
-		{ "icmp6 unreach response" }
+		{ "icmp6 unreach response" },
+		{ "sctp ootb response" }
 	};
 
 	/*
diff --git a/sys/netinet/sctp_input.c b/sys/netinet/sctp_input.c
index f934c745e7a6..dec1619c803b 100644
--- a/sys/netinet/sctp_input.c
+++ b/sys/netinet/sctp_input.c
@@ -6060,15 +6060,8 @@ sctp_skip_csum_4:
 		struct sctp_init_chunk *init_chk, chunk_buf;
 
 		SCTP_STAT_INCR(sctps_noport);
-#ifdef ICMP_BANDLIM
-		/*
-		 * we use the bandwidth limiting to protect against sending
-		 * too many ABORTS all at once. In this case these count the
-		 * same as an ICMP message.
-		 */
-		if (badport_bandlim(0) < 0)
+		if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0)
 			goto bad;
-#endif				/* ICMP_BANDLIM */
 		SCTPDBG(SCTP_DEBUG_INPUT1,
 		    "Sending a ABORT from packet entry!\n");
 		if (ch->chunk_type == SCTP_INITIATION) {