From 1d19ca101f1c458100349d59ba2d115d8e2c6f9d Mon Sep 17 00:00:00 2001
From: vi117747 <none@none>
Date: Thu, 24 May 2007 12:17:11 -0700
Subject: 6349696 PANIC: assertion failed: peer_tcp->tcp_loopback &&
 peer_tcp->tcp_loopback_peer == NULL 6350527 assertion failed: !(flags &  >
 >>TH_MARKNEXT_NEEDED), file: ../../common/inet/tcp/tcp.c 6531423
 SCTP_IPIF_INSERT is adrift 6539189 IFF_COS_ENABLED can be changed by
 SIOCS[L]IFFLAGS 6546661 sctp_update_ipif_addr() panics if passed an ipif tied
 to an unknown ill 6546662 sctp's ill caching cannot handle interface index
 changes 6553898 Page fault during multithreaded SCTP stress test

---
 usr/src/uts/common/inet/tcp_impl.h | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

(limited to 'usr/src/uts/common/inet/tcp_impl.h')

diff --git a/usr/src/uts/common/inet/tcp_impl.h b/usr/src/uts/common/inet/tcp_impl.h
index 2f31dc531a..cfbbe84e3a 100644
--- a/usr/src/uts/common/inet/tcp_impl.h
+++ b/usr/src/uts/common/inet/tcp_impl.h
@@ -108,6 +108,41 @@ extern "C" {
 	}							\
 }
 
+/*
+ * Before caching the conn IRE, we need to make sure certain TCP
+ * states are in sync with the ire. The mismatch could occur if the
+ * TCP state has been set in tcp_adapt_ire() using a different IRE,
+ * e.g if an address was not present during an initial connect(),
+ * tcp_adapt_ire() will set the state using the interface route.
+ * Subsequently, if the address is added to the local machine, the
+ * retransmitted SYN will get the correct (loopback) IRE, but the TCP
+ * state (tcp_loopback and tcp_localnet) will remain out of sync.
+ * This is especially an issue with TCP fusion which relies on the
+ * TCP state to be accurate.
+ *
+ * This check/change should be made only if the TCP is not yet in
+ * the established state, else it would lead to inconsistencies.
+ */
+#define	TCP_CHECK_IREINFO(tcp, ire) {					\
+	if ((tcp)->tcp_state < TCPS_ESTABLISHED) {			\
+		if (((ire)->ire_type & (IRE_LOOPBACK | 			\
+		    IRE_LOCAL)) && !(tcp)->tcp_loopback) {		\
+			(tcp)->tcp_loopback = B_TRUE;			\
+		} else if ((tcp)->tcp_loopback && 			\
+		    !((ire)->ire_type & (IRE_LOOPBACK | IRE_LOCAL))) {	\
+			(tcp)->tcp_loopback = B_FALSE;			\
+		}							\
+		if ((tcp)->tcp_ipversion == IPV4_VERSION) {		\
+			(tcp)->tcp_localnet =				\
+			    ((ire)->ire_gateway_addr == 0);		\
+		} else {						\
+			(tcp)->tcp_localnet =				\
+			    IN6_IS_ADDR_UNSPECIFIED(			\
+			    &(ire)->ire_gateway_addr_v6);		\
+		}							\
+	}								\
+}
+
 /*
  * Write-side flow-control is implemented via the per instance STREAMS
  * write-side Q by explicitly setting QFULL to stop the flow of mblk_t(s)
-- 
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