prepare for the transition to linux 2.6.22 - make it possible to override the kernel version in the target makefile

SVN-Revision: 7644

1 files changed, 339 insertions, 0 deletions

diff --git a/target/linux/generic-2.6/patches-2.6.22/201-multiple_default_gateways.patch b/target/linux/generic-2.6/patches-2.6.22/201-multiple_default_gateways.patch
new file mode 100644
index 0000000..313b110
--- /dev/null
+++ b/target/linux/generic-2.6/patches-2.6.22/201-multiple_default_gateways.patch
@@ -0,0 +1,339 @@
+diff -urN linux-2.6.21.1.old/include/linux/rtnetlink.h linux-2.6.21.1.dev/include/linux/rtnetlink.h
+--- linux-2.6.21.1.old/include/linux/rtnetlink.h	2007-04-27 23:49:26.000000000 +0200
++++ linux-2.6.21.1.dev/include/linux/rtnetlink.h	2007-05-26 20:46:11.883321560 +0200
+@@ -293,6 +293,8 @@
+ #define RTNH_F_DEAD		1	/* Nexthop is dead (used by multipath)	*/
+ #define RTNH_F_PERVASIVE	2	/* Do recursive gateway lookup	*/
+ #define RTNH_F_ONLINK		4	/* Gateway is forced on link	*/
++#define RTNH_F_SUSPECT		8	/* We don't know the real state	*/
++#define RTNH_F_BADSTATE		(RTNH_F_DEAD | RTNH_F_SUSPECT)
+ 
+ /* Macros to handle hexthops */
+ 
+diff -urN linux-2.6.21.1.old/include/net/flow.h linux-2.6.21.1.dev/include/net/flow.h
+--- linux-2.6.21.1.old/include/net/flow.h	2007-04-27 23:49:26.000000000 +0200
++++ linux-2.6.21.1.dev/include/net/flow.h	2007-05-26 20:46:11.922315632 +0200
+@@ -19,6 +19,8 @@
+ 		struct {
+ 			__be32			daddr;
+ 			__be32			saddr;
++			__u32			lsrc;
++			__u32			gw;
+ 			__u8			tos;
+ 			__u8			scope;
+ 		} ip4_u;
+@@ -43,6 +45,8 @@
+ #define fl6_flowlabel	nl_u.ip6_u.flowlabel
+ #define fl4_dst		nl_u.ip4_u.daddr
+ #define fl4_src		nl_u.ip4_u.saddr
++#define fl4_lsrc        nl_u.ip4_u.lsrc
++#define fl4_gw		nl_u.ip4_u.gw
+ #define fl4_tos		nl_u.ip4_u.tos
+ #define fl4_scope	nl_u.ip4_u.scope
+ 
+diff -urN linux-2.6.21.1.old/net/ipv4/route.c linux-2.6.21.1.dev/net/ipv4/route.c
+--- linux-2.6.21.1.old/net/ipv4/route.c	2007-04-27 23:49:26.000000000 +0200
++++ linux-2.6.21.1.dev/net/ipv4/route.c	2007-05-26 20:46:11.967308792 +0200
+@@ -1208,6 +1208,7 @@
+ 
+ 				/* Gateway is different ... */
+ 				rt->rt_gateway		= new_gw;
++				if (rt->fl.fl4_gw) rt->fl.fl4_gw = new_gw;
+ 
+ 				/* Redirect received -> path was valid */
+ 				dst_confirm(&rth->u.dst);
+@@ -1643,6 +1644,7 @@
+ 	rth->fl.fl4_tos	= tos;
+ 	rth->fl.mark    = skb->mark;
+ 	rth->fl.fl4_src	= saddr;
++	rth->fl.fl4_lsrc = 0;
+ 	rth->rt_src	= saddr;
+ #ifdef CONFIG_NET_CLS_ROUTE
+ 	rth->u.dst.tclassid = itag;
+@@ -1653,6 +1655,7 @@
+ 	dev_hold(rth->u.dst.dev);
+ 	rth->idev	= in_dev_get(rth->u.dst.dev);
+ 	rth->fl.oif	= 0;
++	rth->fl.fl4_gw	= 0;
+ 	rth->rt_gateway	= daddr;
+ 	rth->rt_spec_dst= spec_dst;
+ 	rth->rt_type	= RTN_MULTICAST;
+@@ -1716,7 +1719,7 @@
+ static inline int __mkroute_input(struct sk_buff *skb,
+ 				  struct fib_result* res,
+ 				  struct in_device *in_dev,
+-				  __be32 daddr, __be32 saddr, u32 tos,
++				  __be32 daddr, __be32 saddr, u32 tos, u32 lsrc,
+ 				  struct rtable **result)
+ {
+ 
+@@ -1751,6 +1754,7 @@
+ 		flags |= RTCF_DIRECTSRC;
+ 
+ 	if (out_dev == in_dev && err && !(flags & (RTCF_NAT | RTCF_MASQ)) &&
++	    !lsrc &&
+ 	    (IN_DEV_SHARED_MEDIA(out_dev) ||
+ 	     inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res))))
+ 		flags |= RTCF_DOREDIRECT;
+@@ -1788,6 +1792,7 @@
+ 	rth->fl.mark    = skb->mark;
+ 	rth->fl.fl4_src	= saddr;
+ 	rth->rt_src	= saddr;
++	rth->fl.fl4_lsrc	= lsrc;
+ 	rth->rt_gateway	= daddr;
+ 	rth->rt_iif 	=
+ 		rth->fl.iif	= in_dev->dev->ifindex;
+@@ -1795,6 +1800,7 @@
+ 	dev_hold(rth->u.dst.dev);
+ 	rth->idev	= in_dev_get(rth->u.dst.dev);
+ 	rth->fl.oif 	= 0;
++	rth->fl.fl4_gw	= 0;
+ 	rth->rt_spec_dst= spec_dst;
+ 
+ 	rth->u.dst.input = ip_forward;
+@@ -1816,19 +1822,21 @@
+ 				       struct fib_result* res,
+ 				       const struct flowi *fl,
+ 				       struct in_device *in_dev,
+-				       __be32 daddr, __be32 saddr, u32 tos)
++				       __be32 daddr, __be32 saddr, u32 tos, 
++				       u32 lsrc)
+ {
+ 	struct rtable* rth = NULL;
+ 	int err;
+ 	unsigned hash;
+ 
++	fib_select_default(fl, res);
+ #ifdef CONFIG_IP_ROUTE_MULTIPATH
+-	if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0)
++	if (res->fi && res->fi->fib_nhs > 1)
+ 		fib_select_multipath(fl, res);
+ #endif
+ 
+ 	/* create a routing cache entry */
+-	err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth);
++	err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, lsrc, &rth);
+ 	if (err)
+ 		return err;
+ 
+@@ -1841,7 +1849,8 @@
+ 				   struct fib_result* res,
+ 				   const struct flowi *fl,
+ 				   struct in_device *in_dev,
+-				   __be32 daddr, __be32 saddr, u32 tos)
++				   __be32 daddr, __be32 saddr, u32 tos, 
++				   u32 lsrc)
+ {
+ #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
+ 	struct rtable* rth = NULL, *rtres;
+@@ -1857,7 +1866,7 @@
+ 	/* distinguish between multipath and singlepath */
+ 	if (hopcount < 2)
+ 		return ip_mkroute_input_def(skb, res, fl, in_dev, daddr,
+-					    saddr, tos);
++					    saddr, tos, 0);
+ 
+ 	/* add all alternatives to the routing cache */
+ 	for (hop = 0; hop < hopcount; hop++) {
+@@ -1869,7 +1878,7 @@
+ 
+ 		/* create a routing cache entry */
+ 		err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos,
+-				      &rth);
++				      0, &rth);
+ 		if (err)
+ 			return err;
+ 
+@@ -1889,7 +1898,7 @@
+ 	skb->dst = &rtres->u.dst;
+ 	return err;
+ #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED  */
+-	return ip_mkroute_input_def(skb, res, fl, in_dev, daddr, saddr, tos);
++	return ip_mkroute_input_def(skb, res, fl, in_dev, daddr, saddr, tos, lsrc);
+ #endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED  */
+ }
+ 
+@@ -1905,18 +1914,18 @@
+  */
+ 
+ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
+-			       u8 tos, struct net_device *dev)
++			       u8 tos, struct net_device *dev, u32 lsrc)
+ {
+ 	struct fib_result res;
+ 	struct in_device *in_dev = in_dev_get(dev);
+ 	struct flowi fl = { .nl_u = { .ip4_u =
+ 				      { .daddr = daddr,
+-					.saddr = saddr,
++					.saddr = lsrc ? : saddr,
+ 					.tos = tos,
+ 					.scope = RT_SCOPE_UNIVERSE,
+ 				      } },
+ 			    .mark = skb->mark,
+-			    .iif = dev->ifindex };
++			    .iif = lsrc? loopback_dev.ifindex : dev->ifindex };
+ 	unsigned	flags = 0;
+ 	u32		itag = 0;
+ 	struct rtable * rth;
+@@ -1949,6 +1958,12 @@
+ 	if (BADCLASS(daddr) || ZERONET(daddr) || LOOPBACK(daddr))
+ 		goto martian_destination;
+ 
++	if (lsrc) {
++		if (MULTICAST(lsrc) || BADCLASS(lsrc) ||
++		    ZERONET(lsrc) || LOOPBACK(lsrc))
++			goto e_inval;
++	}
++
+ 	/*
+ 	 *	Now we are ready to route packet.
+ 	 */
+@@ -1958,6 +1973,10 @@
+ 		goto no_route;
+ 	}
+ 	free_res = 1;
++	if (lsrc && res.type != RTN_UNICAST && res.type != RTN_NAT)
++		goto e_inval;
++	fl.iif = dev->ifindex;
++	fl.fl4_src = saddr;
+ 
+ 	RT_CACHE_STAT_INC(in_slow_tot);
+ 
+@@ -1982,7 +2001,7 @@
+ 	if (res.type != RTN_UNICAST)
+ 		goto martian_destination;
+ 
+-	err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos);
++	err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos, lsrc);
+ 	if (err == -ENOBUFS)
+ 		goto e_nobufs;
+ 	if (err == -EINVAL)
+@@ -1997,6 +2016,8 @@
+ brd_input:
+ 	if (skb->protocol != htons(ETH_P_IP))
+ 		goto e_inval;
++	if (lsrc)
++		goto e_inval;
+ 
+ 	if (ZERONET(saddr))
+ 		spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK);
+@@ -2037,6 +2058,7 @@
+ 	rth->u.dst.dev	= &loopback_dev;
+ 	dev_hold(rth->u.dst.dev);
+ 	rth->idev	= in_dev_get(rth->u.dst.dev);
++	rth->fl.fl4_gw	= 0;
+ 	rth->rt_gateway	= daddr;
+ 	rth->rt_spec_dst= spec_dst;
+ 	rth->u.dst.input= ip_local_deliver;
+@@ -2086,8 +2108,9 @@
+ 	goto e_inval;
+ }
+ 
+-int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
+-		   u8 tos, struct net_device *dev)
++static inline int
++ip_route_input_cached(struct sk_buff *skb, __be32 daddr, __be32 saddr,
++		   u8 tos, struct net_device *dev, u32 lsrc)
+ {
+ 	struct rtable * rth;
+ 	unsigned	hash;
+@@ -2102,6 +2125,7 @@
+ 		if (rth->fl.fl4_dst == daddr &&
+ 		    rth->fl.fl4_src == saddr &&
+ 		    rth->fl.iif == iif &&
++		    rth->fl.fl4_lsrc == lsrc &&
+ 		    rth->fl.oif == 0 &&
+ 		    rth->fl.mark == skb->mark &&
+ 		    rth->fl.fl4_tos == tos) {
+@@ -2148,7 +2172,19 @@
+ 		rcu_read_unlock();
+ 		return -EINVAL;
+ 	}
+-	return ip_route_input_slow(skb, daddr, saddr, tos, dev);
++	return ip_route_input_slow(skb, daddr, saddr, tos, dev, lsrc);
++}
++
++int ip_route_input(struct sk_buff *skb, u32 daddr, u32 saddr,
++		   u8 tos, struct net_device *dev)
++{
++	return ip_route_input_cached(skb, daddr, saddr, tos, dev, 0);
++}
++
++int ip_route_input_lookup(struct sk_buff *skb, u32 daddr, u32 saddr,
++			  u8 tos, struct net_device *dev, u32 lsrc)
++{
++	return ip_route_input_cached(skb, daddr, saddr, tos, dev, lsrc);
+ }
+ 
+ static inline int __mkroute_output(struct rtable **result,
+@@ -2227,6 +2263,7 @@
+ 	rth->fl.fl4_tos	= tos;
+ 	rth->fl.fl4_src	= oldflp->fl4_src;
+ 	rth->fl.oif	= oldflp->oif;
++	rth->fl.fl4_gw  = oldflp->fl4_gw;
+ 	rth->fl.mark    = oldflp->mark;
+ 	rth->rt_dst	= fl->fl4_dst;
+ 	rth->rt_src	= fl->fl4_src;
+@@ -2367,6 +2404,7 @@
+ 	struct flowi fl = { .nl_u = { .ip4_u =
+ 				      { .daddr = oldflp->fl4_dst,
+ 					.saddr = oldflp->fl4_src,
++					.gw = oldflp->fl4_gw,
+ 					.tos = tos & IPTOS_RT_MASK,
+ 					.scope = ((tos & RTO_ONLINK) ?
+ 						  RT_SCOPE_LINK :
+@@ -2470,6 +2508,7 @@
+ 		dev_out = &loopback_dev;
+ 		dev_hold(dev_out);
+ 		fl.oif = loopback_dev.ifindex;
++		fl.fl4_gw = 0;
+ 		res.type = RTN_LOCAL;
+ 		flags |= RTCF_LOCAL;
+ 		goto make_route;
+@@ -2477,7 +2516,7 @@
+ 
+ 	if (fib_lookup(&fl, &res)) {
+ 		res.fi = NULL;
+-		if (oldflp->oif) {
++		if (oldflp->oif && dev_out->flags & IFF_UP) {
+ 			/* Apparently, routing tables are wrong. Assume,
+ 			   that the destination is on link.
+ 
+@@ -2517,6 +2556,7 @@
+ 		dev_out = &loopback_dev;
+ 		dev_hold(dev_out);
+ 		fl.oif = dev_out->ifindex;
++		fl.fl4_gw = 0;
+ 		if (res.fi)
+ 			fib_info_put(res.fi);
+ 		res.fi = NULL;
+@@ -2524,13 +2564,12 @@
+ 		goto make_route;
+ 	}
+ 
++	if (res.type == RTN_UNICAST)
++		fib_select_default(&fl, &res);
+ #ifdef CONFIG_IP_ROUTE_MULTIPATH
+-	if (res.fi->fib_nhs > 1 && fl.oif == 0)
++	if (res.fi->fib_nhs > 1)
+ 		fib_select_multipath(&fl, &res);
+-	else
+ #endif
+-	if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif)
+-		fib_select_default(&fl, &res);
+ 
+ 	if (!fl.fl4_src)
+ 		fl.fl4_src = FIB_RES_PREFSRC(res);
+@@ -2567,6 +2606,7 @@
+ 		    rth->fl.fl4_src == flp->fl4_src &&
+ 		    rth->fl.iif == 0 &&
+ 		    rth->fl.oif == flp->oif &&
++		    rth->fl.fl4_gw == flp->fl4_gw &&
+ 		    rth->fl.mark == flp->mark &&
+ 		    !((rth->fl.fl4_tos ^ flp->fl4_tos) &
+ 			    (IPTOS_RT_MASK | RTO_ONLINK))) {
+@@ -3271,3 +3311,4 @@
+ EXPORT_SYMBOL(__ip_select_ident);
+ EXPORT_SYMBOL(ip_route_input);
+ EXPORT_SYMBOL(ip_route_output_key);
++EXPORT_SYMBOL(ip_route_input_lookup);