backport two changes from kernel.org: 65e9b62d4503849b10bedfc29bff0473760cc597 ipv6: add special mode accept_ra=2 to accept RA while configured as router

c3bccac2fa76f1619dfe4fb7b9bee69de7f066d8
ipv6: add special mode forwarding=2 to send RS while configured as router

SVN-Revision: 24195

target/linux/generic/patches-2.6.30/300-ipv6_accept_ra_when_forwarding.patch

@@ -0,0 +1,30 @@
+--- a/net/ipv6/ndisc.c
++++ b/net/ipv6/ndisc.c
+@@ -1105,6 +1105,18 @@ errout:
+ 	rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
+ }
+ 
++static inline int accept_ra(struct inet6_dev *in6_dev)
++{
++	/*
++	 * If forwarding is enabled, RA are not accepted unless the special
++	 * hybrid mode (accept_ra=2) is enabled.
++	 */
++	if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2)
++		return 0;
++
++	return in6_dev->cnf.accept_ra;
++}
++
+ static void ndisc_router_discovery(struct sk_buff *skb)
+ {
+ 	struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
+@@ -1150,7 +1162,7 @@ static void ndisc_router_discovery(struc
+ 			   skb->dev->name);
+ 		return;
+ 	}
+-	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) {
++	if (!accept_ra(in6_dev)) {
+ 		in6_dev_put(in6_dev);
+ 		return;
+ 	}

target/linux/generic/patches-2.6.30/301-ipv6_send_rs_when_forwarding.patch

@@ -0,0 +1,12 @@
+--- a/net/ipv6/addrconf.c
++++ b/net/ipv6/addrconf.c
+@@ -2839,7 +2839,8 @@ static void addrconf_dad_completed(struc
+ 	   start sending router solicitations.
+ 	 */
+ 
+-	if (ifp->idev->cnf.forwarding == 0 &&
++	if ((ifp->idev->cnf.forwarding == 0 ||
++	     ifp->idev->cnf.forwarding == 2) &&
+ 	    ifp->idev->cnf.rtr_solicits > 0 &&
+ 	    (dev->flags&IFF_LOOPBACK) == 0 &&
+ 	    (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {

target/linux/generic/patches-2.6.31/300-ipv6_accept_ra_when_forwarding.patch

@@ -0,0 +1,30 @@
+--- a/net/ipv6/ndisc.c
++++ b/net/ipv6/ndisc.c
+@@ -1106,6 +1106,18 @@ errout:
+ 	rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
+ }
+ 
++static inline int accept_ra(struct inet6_dev *in6_dev)
++{
++	/*
++	 * If forwarding is enabled, RA are not accepted unless the special
++	 * hybrid mode (accept_ra=2) is enabled.
++	 */
++	if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2)
++		return 0;
++
++	return in6_dev->cnf.accept_ra;
++}
++
+ static void ndisc_router_discovery(struct sk_buff *skb)
+ {
+ 	struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
+@@ -1151,7 +1163,7 @@ static void ndisc_router_discovery(struc
+ 			   skb->dev->name);
+ 		return;
+ 	}
+-	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) {
++	if (!accept_ra(in6_dev)) {
+ 		in6_dev_put(in6_dev);
+ 		return;
+ 	}

target/linux/generic/patches-2.6.31/301-ipv6_send_rs_when_forwarding.patch

@@ -0,0 +1,12 @@
+--- a/net/ipv6/addrconf.c
++++ b/net/ipv6/addrconf.c
+@@ -2864,7 +2864,8 @@ static void addrconf_dad_completed(struc
+ 	   start sending router solicitations.
+ 	 */
+ 
+-	if (ifp->idev->cnf.forwarding == 0 &&
++	if ((ifp->idev->cnf.forwarding == 0 ||
++	     ifp->idev->cnf.forwarding == 2) &&
+ 	    ifp->idev->cnf.rtr_solicits > 0 &&
+ 	    (dev->flags&IFF_LOOPBACK) == 0 &&
+ 	    (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {

target/linux/generic/patches-2.6.32/300-ipv6_accept_ra_when_forwarding.patch

@@ -0,0 +1,41 @@
+--- a/net/ipv6/ndisc.c
++++ b/net/ipv6/ndisc.c
+@@ -1105,6 +1105,18 @@ errout:
+ 	rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
+ }
+ 
++static inline int accept_ra(struct inet6_dev *in6_dev)
++{
++	/*
++	 * If forwarding is enabled, RA are not accepted unless the special
++	 * hybrid mode (accept_ra=2) is enabled.
++	 */
++	if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2)
++		return 0;
++
++	return in6_dev->cnf.accept_ra;
++}
++
+ static void ndisc_router_discovery(struct sk_buff *skb)
+ {
+ 	struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
+@@ -1158,8 +1170,7 @@ static void ndisc_router_discovery(struc
+ 		return;
+ 	}
+ 
+-	/* skip route and link configuration on routers */
+-	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra)
++	if (!accept_ra(in6_dev))
+ 		goto skip_linkparms;
+ 
+ #ifdef CONFIG_IPV6_NDISC_NODETYPE
+@@ -1309,8 +1320,7 @@ skip_linkparms:
+ 			     NEIGH_UPDATE_F_ISROUTER);
+ 	}
+ 
+-	/* skip route and link configuration on routers */
+-	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra)
++	if (!accept_ra(in6_dev))
+ 		goto out;
+ 
+ #ifdef CONFIG_IPV6_ROUTE_INFO

target/linux/generic/patches-2.6.32/301-ipv6_send_rs_when_forwarding.patch

@@ -0,0 +1,12 @@
+--- a/net/ipv6/addrconf.c
++++ b/net/ipv6/addrconf.c
+@@ -2888,7 +2888,8 @@ static void addrconf_dad_completed(struc
+ 	   start sending router solicitations.
+ 	 */
+ 
+-	if (ifp->idev->cnf.forwarding == 0 &&
++	if ((ifp->idev->cnf.forwarding == 0 ||
++	     ifp->idev->cnf.forwarding == 2) &&
+ 	    ifp->idev->cnf.rtr_solicits > 0 &&
+ 	    (dev->flags&IFF_LOOPBACK) == 0 &&
+ 	    (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {

target/linux/generic/patches-2.6.33/300-ipv6_accept_ra_when_forwarding.patch

@@ -0,0 +1,41 @@
+--- a/net/ipv6/ndisc.c
++++ b/net/ipv6/ndisc.c
+@@ -1106,6 +1106,18 @@ errout:
+ 	rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
+ }
+ 
++static inline int accept_ra(struct inet6_dev *in6_dev)
++{
++	/*
++	 * If forwarding is enabled, RA are not accepted unless the special
++	 * hybrid mode (accept_ra=2) is enabled.
++	 */
++	if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2)
++		return 0;
++
++	return in6_dev->cnf.accept_ra;
++}
++
+ static void ndisc_router_discovery(struct sk_buff *skb)
+ {
+ 	struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
+@@ -1159,8 +1171,7 @@ static void ndisc_router_discovery(struc
+ 		return;
+ 	}
+ 
+-	/* skip route and link configuration on routers */
+-	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra)
++	if (!accept_ra(in6_dev))
+ 		goto skip_linkparms;
+ 
+ #ifdef CONFIG_IPV6_NDISC_NODETYPE
+@@ -1310,8 +1321,7 @@ skip_linkparms:
+ 			     NEIGH_UPDATE_F_ISROUTER);
+ 	}
+ 
+-	/* skip route and link configuration on routers */
+-	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra)
++	if (!accept_ra(in6_dev))
+ 		goto out;
+ 
+ #ifdef CONFIG_IPV6_ROUTE_INFO

target/linux/generic/patches-2.6.33/301-ipv6_send_rs_when_forwarding.patch

@@ -0,0 +1,12 @@
+--- a/net/ipv6/addrconf.c
++++ b/net/ipv6/addrconf.c
+@@ -2884,7 +2884,8 @@ static void addrconf_dad_completed(struc
+ 	   start sending router solicitations.
+ 	 */
+ 
+-	if (ifp->idev->cnf.forwarding == 0 &&
++	if ((ifp->idev->cnf.forwarding == 0 ||
++	     ifp->idev->cnf.forwarding == 2) &&
+ 	    ifp->idev->cnf.rtr_solicits > 0 &&
+ 	    (dev->flags&IFF_LOOPBACK) == 0 &&
+ 	    (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {

target/linux/generic/patches-2.6.34/300-ipv6_accept_ra_when_forwarding.patch

@@ -0,0 +1,41 @@
+--- a/net/ipv6/ndisc.c
++++ b/net/ipv6/ndisc.c
+@@ -1107,6 +1107,18 @@ errout:
+ 	rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
+ }
+ 
++static inline int accept_ra(struct inet6_dev *in6_dev)
++{
++	/*
++	 * If forwarding is enabled, RA are not accepted unless the special
++	 * hybrid mode (accept_ra=2) is enabled.
++	 */
++	if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2)
++		return 0;
++
++	return in6_dev->cnf.accept_ra;
++}
++
+ static void ndisc_router_discovery(struct sk_buff *skb)
+ {
+ 	struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
+@@ -1160,8 +1172,7 @@ static void ndisc_router_discovery(struc
+ 		return;
+ 	}
+ 
+-	/* skip route and link configuration on routers */
+-	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra)
++	if (!accept_ra(in6_dev))
+ 		goto skip_linkparms;
+ 
+ #ifdef CONFIG_IPV6_NDISC_NODETYPE
+@@ -1311,8 +1322,7 @@ skip_linkparms:
+ 			     NEIGH_UPDATE_F_ISROUTER);
+ 	}
+ 
+-	/* skip route and link configuration on routers */
+-	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra)
++	if (!accept_ra(in6_dev))
+ 		goto out;
+ 
+ #ifdef CONFIG_IPV6_ROUTE_INFO

target/linux/generic/patches-2.6.34/301-ipv6_send_rs_when_forwarding.patch

@@ -0,0 +1,12 @@
+--- a/net/ipv6/addrconf.c
++++ b/net/ipv6/addrconf.c
+@@ -2924,7 +2924,8 @@ static void addrconf_dad_completed(struc
+ 	   start sending router solicitations.
+ 	 */
+ 
+-	if (ifp->idev->cnf.forwarding == 0 &&
++	if ((ifp->idev->cnf.forwarding == 0 ||
++	     ifp->idev->cnf.forwarding == 2) &&
+ 	    ifp->idev->cnf.rtr_solicits > 0 &&
+ 	    (dev->flags&IFF_LOOPBACK) == 0 &&
+ 	    (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {

target/linux/generic/patches-2.6.35/300-ipv6_accept_ra_when_forwarding.patch

@@ -0,0 +1,41 @@
+--- a/net/ipv6/ndisc.c
++++ b/net/ipv6/ndisc.c
+@@ -1105,6 +1105,18 @@ errout:
+ 	rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
+ }
+ 
++static inline int accept_ra(struct inet6_dev *in6_dev)
++{
++	/*
++	 * If forwarding is enabled, RA are not accepted unless the special
++	 * hybrid mode (accept_ra=2) is enabled.
++	 */
++	if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2)
++		return 0;
++
++	return in6_dev->cnf.accept_ra;
++}
++
+ static void ndisc_router_discovery(struct sk_buff *skb)
+ {
+ 	struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
+@@ -1158,8 +1170,7 @@ static void ndisc_router_discovery(struc
+ 		return;
+ 	}
+ 
+-	/* skip route and link configuration on routers */
+-	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra)
++	if (!accept_ra(in6_dev))
+ 		goto skip_linkparms;
+ 
+ #ifdef CONFIG_IPV6_NDISC_NODETYPE
+@@ -1309,8 +1320,7 @@ skip_linkparms:
+ 			     NEIGH_UPDATE_F_ISROUTER);
+ 	}
+ 
+-	/* skip route and link configuration on routers */
+-	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra)
++	if (!accept_ra(in6_dev))
+ 		goto out;
+ 
+ #ifdef CONFIG_IPV6_ROUTE_INFO

target/linux/generic/patches-2.6.35/301-ipv6_send_rs_when_forwarding.patch

@@ -0,0 +1,12 @@
+--- a/net/ipv6/addrconf.c
++++ b/net/ipv6/addrconf.c
+@@ -2961,7 +2961,8 @@ static void addrconf_dad_completed(struc
+ 	   start sending router solicitations.
+ 	 */
+ 
+-	if (ifp->idev->cnf.forwarding == 0 &&
++	if ((ifp->idev->cnf.forwarding == 0 ||
++	     ifp->idev->cnf.forwarding == 2) &&
+ 	    ifp->idev->cnf.rtr_solicits > 0 &&
+ 	    (dev->flags&IFF_LOOPBACK) == 0 &&
+ 	    (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {

target/linux/generic/patches-2.6.36/300-ipv6_accept_ra_when_forwarding.patch

@@ -0,0 +1,41 @@
+--- a/net/ipv6/ndisc.c
++++ b/net/ipv6/ndisc.c
+@@ -1105,6 +1105,18 @@ errout:
+ 	rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
+ }
+ 
++static inline int accept_ra(struct inet6_dev *in6_dev)
++{
++	/*
++	 * If forwarding is enabled, RA are not accepted unless the special
++	 * hybrid mode (accept_ra=2) is enabled.
++	 */
++	if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2)
++		return 0;
++
++	return in6_dev->cnf.accept_ra;
++}
++
+ static void ndisc_router_discovery(struct sk_buff *skb)
+ {
+ 	struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
+@@ -1158,8 +1170,7 @@ static void ndisc_router_discovery(struc
+ 		return;
+ 	}
+ 
+-	/* skip route and link configuration on routers */
+-	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra)
++	if (!accept_ra(in6_dev))
+ 		goto skip_linkparms;
+ 
+ #ifdef CONFIG_IPV6_NDISC_NODETYPE
+@@ -1309,8 +1320,7 @@ skip_linkparms:
+ 			     NEIGH_UPDATE_F_ISROUTER);
+ 	}
+ 
+-	/* skip route and link configuration on routers */
+-	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra)
++	if (!accept_ra(in6_dev))
+ 		goto out;
+ 
+ #ifdef CONFIG_IPV6_ROUTE_INFO

target/linux/generic/patches-2.6.36/301-ipv6_send_rs_when_forwarding.patch

@@ -0,0 +1,12 @@
+--- a/net/ipv6/addrconf.c
++++ b/net/ipv6/addrconf.c
+@@ -2964,7 +2964,8 @@ static void addrconf_dad_completed(struc
+ 	   start sending router solicitations.
+ 	 */
+ 
+-	if (ifp->idev->cnf.forwarding == 0 &&
++	if ((ifp->idev->cnf.forwarding == 0 ||
++	     ifp->idev->cnf.forwarding == 2) &&
+ 	    ifp->idev->cnf.rtr_solicits > 0 &&
+ 	    (dev->flags&IFF_LOOPBACK) == 0 &&
+ 	    (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {