MFC r317597:

Allow SCTP to use the hostcache.

This patch allows the MTU stored in the hostcache to be used as an
initial value for SCTP paths. When an ICMP PTB message is received,
store the MTU in the hostcache.

1 files changed, 90 insertions, 0 deletions

diff --git a/sys/netinet/sctputil.c b/sys/netinet/sctputil.c
index 2951ad6..1dd3c3e 100644
--- a/sys/netinet/sctputil.c
+++ b/sys/netinet/sctputil.c
@@ -49,6 +49,9 @@ __FBSDID("$FreeBSD$");
 #include <netinet/sctp_auth.h>
 #include <netinet/sctp_asconf.h>
 #include <netinet/sctp_bsd_addr.h>
+#if defined(INET6) || defined(INET)
+#include <netinet/tcp_var.h>
+#endif
 #include <netinet/udp.h>
 #include <netinet/udp_var.h>
 #include <sys/proc.h>
@@ -7235,3 +7238,90 @@ sctp_over_udp_start(void)
 #endif
 	return (0);
 }
+
+#if defined(INET6) || defined(INET)
+
+/*
+ * sctp_min_mtu ()returns the minimum of all non-zero arguments.
+ * If all arguments are zero, zero is returned.
+ */
+uint32_t
+sctp_min_mtu(uint32_t mtu1, uint32_t mtu2, uint32_t mtu3)
+{
+	if (mtu1 > 0) {
+		if (mtu2 > 0) {
+			if (mtu3 > 0) {
+				return (min(mtu1, min(mtu2, mtu3)));
+			} else {
+				return (min(mtu1, mtu2));
+			}
+		} else {
+			if (mtu3 > 0) {
+				return (min(mtu1, mtu3));
+			} else {
+				return (mtu1);
+			}
+		}
+	} else {
+		if (mtu2 > 0) {
+			if (mtu3 > 0) {
+				return (min(mtu2, mtu3));
+			} else {
+				return (mtu2);
+			}
+		} else {
+			return (mtu3);
+		}
+	}
+}
+
+void
+sctp_hc_set_mtu(union sctp_sockstore *addr, uint16_t fibnum, uint32_t mtu)
+{
+	struct in_conninfo inc;
+
+	memset(&inc, 0, sizeof(struct in_conninfo));
+	inc.inc_fibnum = fibnum;
+	switch (addr->sa.sa_family) {
+#ifdef INET
+	case AF_INET:
+		inc.inc_faddr = addr->sin.sin_addr;
+		break;
+#endif
+#ifdef INET6
+	case AF_INET6:
+		inc.inc_flags |= INC_ISIPV6;
+		inc.inc6_faddr = addr->sin6.sin6_addr;
+		break;
+#endif
+	default:
+		return;
+	}
+	tcp_hc_updatemtu(&inc, (u_long)mtu);
+}
+
+uint32_t
+sctp_hc_get_mtu(union sctp_sockstore *addr, uint16_t fibnum)
+{
+	struct in_conninfo inc;
+
+	memset(&inc, 0, sizeof(struct in_conninfo));
+	inc.inc_fibnum = fibnum;
+	switch (addr->sa.sa_family) {
+#ifdef INET
+	case AF_INET:
+		inc.inc_faddr = addr->sin.sin_addr;
+		break;
+#endif
+#ifdef INET6
+	case AF_INET6:
+		inc.inc_flags |= INC_ISIPV6;
+		inc.inc6_faddr = addr->sin6.sin6_addr;
+		break;
+#endif
+	default:
+		return (0);
+	}
+	return ((uint32_t)tcp_hc_getmtu(&inc));
+}
+#endif