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openwrt/target/linux/generic-2.6/patches-2.6.22/201-multiple_default_gateways.patch

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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);
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