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

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Add multiple default gateways patch. No need to change the kernel configuration. Builds fine. Close #460 for the kamikaze part SVN-Revision: 3613
2006-04-11 09:41:06 +00:00
diff -ur v2.6.14/linux/include/linux/netfilter_ipv4/ip_nat.h linux/include/linux/netfilter_ipv4/ip_nat.h
--- v2.6.14/linux/include/linux/netfilter_ipv4/ip_nat.h 2005-10-29 14:15:09.000000000 +0300
+++ linux/include/linux/netfilter_ipv4/ip_nat.h 2005-10-29 18:11:32.885759304 +0300
@@ -63,6 +63,13 @@
struct ip_conntrack;
+/* Call input routing for SNAT-ed traffic */
+extern unsigned int ip_nat_route_input(unsigned int hooknum,
+ struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *));
+
/* Set up the info structure to map into this range. */
extern unsigned int ip_nat_setup_info(struct ip_conntrack *conntrack,
const struct ip_nat_range *range,
diff -ur v2.6.14/linux/include/linux/rtnetlink.h linux/include/linux/rtnetlink.h
--- v2.6.14/linux/include/linux/rtnetlink.h 2005-10-29 14:15:09.000000000 +0300
+++ linux/include/linux/rtnetlink.h 2005-10-29 18:11:21.299520680 +0300
@@ -292,6 +292,8 @@
#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 -ur v2.6.14/linux/include/net/flow.h linux/include/net/flow.h
--- v2.6.14/linux/include/net/flow.h 2005-06-18 08:50:52.000000000 +0300
+++ linux/include/net/flow.h 2005-10-29 18:11:32.885759304 +0300
@@ -19,6 +19,8 @@
__u32 daddr;
__u32 saddr;
__u32 fwmark;
+ __u32 lsrc;
+ __u32 gw;
__u8 tos;
__u8 scope;
} ip4_u;
@@ -46,6 +48,8 @@
#define fl4_dst nl_u.ip4_u.daddr
#define fl4_src nl_u.ip4_u.saddr
#define fl4_fwmark nl_u.ip4_u.fwmark
+#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 -ur v2.6.14/linux/include/net/ip_fib.h linux/include/net/ip_fib.h
--- v2.6.14/linux/include/net/ip_fib.h 2005-10-29 14:15:09.000000000 +0300
+++ linux/include/net/ip_fib.h 2005-10-29 18:11:21.300520528 +0300
@@ -195,7 +195,8 @@
static inline void fib_select_default(const struct flowi *flp, struct fib_result *res)
{
- if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
+ if ((FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) ||
+ FIB_RES_NH(*res).nh_scope == RT_SCOPE_HOST)
ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res);
}
@@ -207,6 +208,7 @@
extern int fib_lookup(const struct flowi *flp, struct fib_result *res);
extern struct fib_table *__fib_new_table(int id);
extern void fib_rule_put(struct fib_rule *r);
+extern int fib_result_table(struct fib_result *res);
static inline struct fib_table *fib_get_table(int id)
{
@@ -300,4 +302,6 @@
extern void fib_proc_exit(void);
#endif
+extern rwlock_t fib_nhflags_lock;
+
#endif /* _NET_FIB_H */
diff -ur v2.6.14/linux/include/net/route.h linux/include/net/route.h
--- v2.6.14/linux/include/net/route.h 2005-10-29 14:15:09.000000000 +0300
+++ linux/include/net/route.h 2005-10-29 18:11:32.885759304 +0300
@@ -117,6 +117,7 @@
extern int ip_route_output_key(struct rtable **, struct flowi *flp);
extern int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin);
+extern int ip_route_input_lookup(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin, u32 lsrc);
extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
extern void ip_rt_send_redirect(struct sk_buff *skb);
diff -ur v2.6.14/linux/net/ipv4/fib_frontend.c linux/net/ipv4/fib_frontend.c
--- v2.6.14/linux/net/ipv4/fib_frontend.c 2005-10-29 14:15:09.000000000 +0300
+++ linux/net/ipv4/fib_frontend.c 2005-10-29 18:11:21.300520528 +0300
@@ -54,6 +54,8 @@
struct fib_table *ip_fib_local_table;
struct fib_table *ip_fib_main_table;
+#define FIB_RES_TABLE(r) (RT_TABLE_MAIN)
+
#else
#define RT_TABLE_MIN 1
@@ -71,6 +73,7 @@
return tb;
}
+#define FIB_RES_TABLE(r) (fib_result_table(r))
#endif /* CONFIG_IP_MULTIPLE_TABLES */
@@ -168,6 +171,9 @@
.tos = tos } },
.iif = oif };
struct fib_result res;
+ int table;
+ unsigned char prefixlen;
+ unsigned char scope;
int no_addr, rpf;
int ret;
@@ -189,31 +195,35 @@
goto e_inval_res;
*spec_dst = FIB_RES_PREFSRC(res);
fib_combine_itag(itag, &res);
-#ifdef CONFIG_IP_ROUTE_MULTIPATH
- if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1)
-#else
if (FIB_RES_DEV(res) == dev)
-#endif
{
ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
fib_res_put(&res);
return ret;
}
+ table = FIB_RES_TABLE(&res);
+ prefixlen = res.prefixlen;
+ scope = res.scope;
fib_res_put(&res);
if (no_addr)
goto last_resort;
- if (rpf)
- goto e_inval;
fl.oif = dev->ifindex;
ret = 0;
if (fib_lookup(&fl, &res) == 0) {
- if (res.type == RTN_UNICAST) {
+ if (res.type == RTN_UNICAST &&
+ ((table == FIB_RES_TABLE(&res) &&
+ res.prefixlen >= prefixlen && res.scope >= scope) ||
+ !rpf)) {
*spec_dst = FIB_RES_PREFSRC(res);
ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
+ fib_res_put(&res);
+ return ret;
}
fib_res_put(&res);
}
+ if (rpf)
+ goto e_inval;
return ret;
last_resort:
@@ -584,9 +594,7 @@
switch (event) {
case NETDEV_UP:
fib_add_ifaddr(ifa);
-#ifdef CONFIG_IP_ROUTE_MULTIPATH
fib_sync_up(ifa->ifa_dev->dev);
-#endif
rt_cache_flush(-1);
break;
case NETDEV_DOWN:
@@ -622,9 +630,7 @@
for_ifa(in_dev) {
fib_add_ifaddr(ifa);
} endfor_ifa(in_dev);
-#ifdef CONFIG_IP_ROUTE_MULTIPATH
fib_sync_up(dev);
-#endif
rt_cache_flush(-1);
break;
case NETDEV_DOWN:
diff -ur v2.6.14/linux/net/ipv4/fib_hash.c linux/net/ipv4/fib_hash.c
--- v2.6.14/linux/net/ipv4/fib_hash.c 2005-10-29 14:15:09.000000000 +0300
+++ linux/net/ipv4/fib_hash.c 2005-10-29 18:11:21.301520376 +0300
@@ -276,30 +276,38 @@
return err;
}
-static int fn_hash_last_dflt=-1;
-
static void
fn_hash_select_default(struct fib_table *tb, const struct flowi *flp, struct fib_result *res)
{
- int order, last_idx;
+ int order, last_idx, last_dflt, last_nhsel;
+ struct fib_alias *first_fa = NULL;
+ struct hlist_head *head;
struct hlist_node *node;
struct fib_node *f;
struct fib_info *fi = NULL;
struct fib_info *last_resort;
struct fn_hash *t = (struct fn_hash*)tb->tb_data;
- struct fn_zone *fz = t->fn_zones[0];
+ struct fn_zone *fz = t->fn_zones[res->prefixlen];
+ u32 k;
if (fz == NULL)
return;
+ k = fz_key(flp->fl4_dst, fz);
+ last_dflt = -2;
+ last_nhsel = 0;
last_idx = -1;
last_resort = NULL;
order = -1;
read_lock(&fib_hash_lock);
- hlist_for_each_entry(f, node, &fz->fz_hash[0], fn_hash) {
+ head = &fz->fz_hash[fn_hash(k, fz)];
+ hlist_for_each_entry(f, node, head, fn_hash) {
struct fib_alias *fa;
+ if (f->fn_key != k)
+ continue;
+
list_for_each_entry(fa, &f->fn_alias, fa_list) {
struct fib_info *next_fi = fa->fa_info;
@@ -307,41 +315,52 @@
fa->fa_type != RTN_UNICAST)
continue;
+ if (fa->fa_tos &&
+ fa->fa_tos != flp->fl4_tos)
+ continue;
if (next_fi->fib_priority > res->fi->fib_priority)
break;
- if (!next_fi->fib_nh[0].nh_gw ||
- next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK)
- continue;
fa->fa_state |= FA_S_ACCESSED;
- if (fi == NULL) {
- if (next_fi != res->fi)
- break;
- } else if (!fib_detect_death(fi, order, &last_resort,
- &last_idx, &fn_hash_last_dflt)) {
+ if (!first_fa) {
+ last_dflt = fa->fa_last_dflt;
+ first_fa = fa;
+ }
+ if (fi && !fib_detect_death(fi, order, &last_resort,
+ &last_idx, &last_dflt, &last_nhsel, flp)) {
if (res->fi)
fib_info_put(res->fi);
res->fi = fi;
atomic_inc(&fi->fib_clntref);
- fn_hash_last_dflt = order;
+ first_fa->fa_last_dflt = order;
goto out;
}
fi = next_fi;
order++;
}
+ break;
}
if (order <= 0 || fi == NULL) {
- fn_hash_last_dflt = -1;
+ if (fi && fi->fib_nhs > 1 &&
+ fib_detect_death(fi, order, &last_resort, &last_idx,
+ &last_dflt, &last_nhsel, flp) &&
+ last_resort == fi) {
+ read_lock_bh(&fib_nhflags_lock);
+ fi->fib_nh[last_nhsel].nh_flags &= ~RTNH_F_SUSPECT;
+ read_unlock_bh(&fib_nhflags_lock);
+ }
+ if (first_fa) first_fa->fa_last_dflt = -1;
goto out;
}
- if (!fib_detect_death(fi, order, &last_resort, &last_idx, &fn_hash_last_dflt)) {
+ if (!fib_detect_death(fi, order, &last_resort, &last_idx,
+ &last_dflt, &last_nhsel, flp)) {
if (res->fi)
fib_info_put(res->fi);
res->fi = fi;
atomic_inc(&fi->fib_clntref);
- fn_hash_last_dflt = order;
+ first_fa->fa_last_dflt = order;
goto out;
}
@@ -351,8 +370,11 @@
res->fi = last_resort;
if (last_resort)
atomic_inc(&last_resort->fib_clntref);
+ read_lock_bh(&fib_nhflags_lock);
+ last_resort->fib_nh[last_nhsel].nh_flags &= ~RTNH_F_SUSPECT;
+ read_unlock_bh(&fib_nhflags_lock);
+ first_fa->fa_last_dflt = last_idx;
}
- fn_hash_last_dflt = last_idx;
out:
read_unlock(&fib_hash_lock);
}
@@ -451,6 +473,7 @@
write_lock_bh(&fib_hash_lock);
fi_drop = fa->fa_info;
fa->fa_info = fi;
+ fa->fa_last_dflt = -1;
fa->fa_type = type;
fa->fa_scope = r->rtm_scope;
state = fa->fa_state;
@@ -510,6 +533,7 @@
new_fa->fa_type = type;
new_fa->fa_scope = r->rtm_scope;
new_fa->fa_state = 0;
+ new_fa->fa_last_dflt = -1;
/*
* Insert new entry to the list.
diff -ur v2.6.14/linux/net/ipv4/fib_lookup.h linux/net/ipv4/fib_lookup.h
--- v2.6.14/linux/net/ipv4/fib_lookup.h 2005-10-29 14:15:09.000000000 +0300
+++ linux/net/ipv4/fib_lookup.h 2005-10-29 18:11:21.302520224 +0300
@@ -9,6 +9,7 @@
struct list_head fa_list;
struct rcu_head rcu;
struct fib_info *fa_info;
+ int fa_last_dflt;
u8 fa_tos;
u8 fa_type;
u8 fa_scope;
@@ -40,6 +41,7 @@
u8 tos, u32 prio);
extern int fib_detect_death(struct fib_info *fi, int order,
struct fib_info **last_resort,
- int *last_idx, int *dflt);
+ int *last_idx, int *dflt, int *last_nhsel,
+ const struct flowi *flp);
#endif /* _FIB_LOOKUP_H */
diff -ur v2.6.14/linux/net/ipv4/fib_rules.c linux/net/ipv4/fib_rules.c
--- v2.6.14/linux/net/ipv4/fib_rules.c 2005-08-29 07:51:29.000000000 +0300
+++ linux/net/ipv4/fib_rules.c 2005-10-29 18:11:21.302520224 +0300
@@ -280,6 +280,11 @@
}
}
+int fib_result_table(struct fib_result *res)
+{
+ return res->r->r_table;
+}
+
int fib_lookup(const struct flowi *flp, struct fib_result *res)
{
int err;
@@ -342,7 +347,8 @@
void fib_select_default(const struct flowi *flp, struct fib_result *res)
{
if (res->r && res->r->r_action == RTN_UNICAST &&
- FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) {
+ ((FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) ||
+ FIB_RES_NH(*res).nh_scope == RT_SCOPE_HOST)) {
struct fib_table *tb;
if ((tb = fib_get_table(res->r->r_table)) != NULL)
tb->tb_select_default(tb, flp, res);
diff -ur v2.6.14/linux/net/ipv4/fib_semantics.c linux/net/ipv4/fib_semantics.c
--- v2.6.14/linux/net/ipv4/fib_semantics.c 2005-10-29 14:15:09.000000000 +0300
+++ linux/net/ipv4/fib_semantics.c 2005-10-29 18:11:32.886759152 +0300
@@ -53,6 +53,7 @@
static struct hlist_head *fib_info_laddrhash;
static unsigned int fib_hash_size;
static unsigned int fib_info_cnt;
+rwlock_t fib_nhflags_lock = RW_LOCK_UNLOCKED;
#define DEVINDEX_HASHBITS 8
#define DEVINDEX_HASHSIZE (1U << DEVINDEX_HASHBITS)
@@ -188,7 +189,7 @@
#ifdef CONFIG_NET_CLS_ROUTE
nh->nh_tclassid != onh->nh_tclassid ||
#endif
- ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
+ ((nh->nh_flags^onh->nh_flags)&~RTNH_F_BADSTATE))
return -1;
onh++;
} endfor_nexthops(fi);
@@ -225,7 +226,7 @@
nfi->fib_priority == fi->fib_priority &&
memcmp(nfi->fib_metrics, fi->fib_metrics,
sizeof(fi->fib_metrics)) == 0 &&
- ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
+ ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_BADSTATE) == 0 &&
(nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0))
return fi;
}
@@ -317,26 +318,70 @@
}
int fib_detect_death(struct fib_info *fi, int order,
- struct fib_info **last_resort, int *last_idx, int *dflt)
+ struct fib_info **last_resort, int *last_idx, int *dflt,
+ int *last_nhsel, const struct flowi *flp)
{
struct neighbour *n;
- int state = NUD_NONE;
+ int nhsel;
+ int state;
+ struct fib_nh * nh;
+ u32 dst;
+ int flag, dead = 1;
+
+ /* change_nexthops(fi) { */
+ for (nhsel = 0, nh = fi->fib_nh; nhsel < fi->fib_nhs; nh++, nhsel++) {
+ if (flp->oif && flp->oif != nh->nh_oif)
+ continue;
+ if (flp->fl4_gw && flp->fl4_gw != nh->nh_gw && nh->nh_gw &&
+ nh->nh_scope == RT_SCOPE_LINK)
+ continue;
+ if (nh->nh_flags & RTNH_F_DEAD)
+ continue;
- n = neigh_lookup(&arp_tbl, &fi->fib_nh[0].nh_gw, fi->fib_dev);
- if (n) {
- state = n->nud_state;
- neigh_release(n);
- }
- if (state==NUD_REACHABLE)
- return 0;
- if ((state&NUD_VALID) && order != *dflt)
- return 0;
- if ((state&NUD_VALID) ||
- (*last_idx<0 && order > *dflt)) {
- *last_resort = fi;
- *last_idx = order;
+ flag = 0;
+ if (nh->nh_dev->flags & IFF_NOARP) {
+ dead = 0;
+ goto setfl;
+ }
+
+ dst = nh->nh_gw;
+ if (!nh->nh_gw || nh->nh_scope != RT_SCOPE_LINK)
+ dst = flp->fl4_dst;
+
+ state = NUD_NONE;
+ n = neigh_lookup(&arp_tbl, &dst, nh->nh_dev);
+ if (n) {
+ state = n->nud_state;
+ neigh_release(n);
+ }
+ if (state==NUD_REACHABLE ||
+ ((state&NUD_VALID) && order != *dflt)) {
+ dead = 0;
+ goto setfl;
+ }
+ if (!(state&NUD_VALID))
+ flag = 1;
+ if (!dead)
+ goto setfl;
+ if ((state&NUD_VALID) ||
+ (*last_idx<0 && order >= *dflt)) {
+ *last_resort = fi;
+ *last_idx = order;
+ *last_nhsel = nhsel;
+ }
+
+ setfl:
+
+ read_lock_bh(&fib_nhflags_lock);
+ if (flag)
+ nh->nh_flags |= RTNH_F_SUSPECT;
+ else
+ nh->nh_flags &= ~RTNH_F_SUSPECT;
+ read_unlock_bh(&fib_nhflags_lock);
}
- return 1;
+ /* } endfor_nexthops(fi) */
+
+ return dead;
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
@@ -507,8 +552,11 @@
return -EINVAL;
if ((dev = __dev_get_by_index(nh->nh_oif)) == NULL)
return -ENODEV;
- if (!(dev->flags&IFF_UP))
- return -ENETDOWN;
+ if (!(dev->flags&IFF_UP)) {
+ if (fi->fib_protocol != RTPROT_STATIC)
+ return -ENETDOWN;
+ nh->nh_flags |= RTNH_F_DEAD;
+ }
nh->nh_dev = dev;
dev_hold(dev);
nh->nh_scope = RT_SCOPE_LINK;
@@ -523,24 +571,48 @@
/* It is not necessary, but requires a bit of thinking */
if (fl.fl4_scope < RT_SCOPE_LINK)
fl.fl4_scope = RT_SCOPE_LINK;
- if ((err = fib_lookup(&fl, &res)) != 0)
- return err;
+ err = fib_lookup(&fl, &res);
}
- err = -EINVAL;
- if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
- goto out;
- nh->nh_scope = res.scope;
- nh->nh_oif = FIB_RES_OIF(res);
- if ((nh->nh_dev = FIB_RES_DEV(res)) == NULL)
- goto out;
- dev_hold(nh->nh_dev);
- err = -ENETDOWN;
- if (!(nh->nh_dev->flags & IFF_UP))
- goto out;
- err = 0;
+ if (err) {
+ struct in_device *in_dev;
+
+ if (err != -ENETUNREACH ||
+ fi->fib_protocol != RTPROT_STATIC)
+ return err;
+
+ in_dev = inetdev_by_index(nh->nh_oif);
+ if (in_dev == NULL ||
+ in_dev->dev->flags & IFF_UP) {
+ if (in_dev)
+ in_dev_put(in_dev);
+ return err;
+ }
+ nh->nh_flags |= RTNH_F_DEAD;
+ nh->nh_scope = RT_SCOPE_LINK;
+ nh->nh_dev = in_dev->dev;
+ dev_hold(nh->nh_dev);
+ in_dev_put(in_dev);
+ } else {
+ err = -EINVAL;
+ if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
+ goto out;
+ nh->nh_scope = res.scope;
+ nh->nh_oif = FIB_RES_OIF(res);
+ if ((nh->nh_dev = FIB_RES_DEV(res)) == NULL)
+ goto out;
+ dev_hold(nh->nh_dev);
+ if (!(nh->nh_dev->flags & IFF_UP)) {
+ if (fi->fib_protocol != RTPROT_STATIC) {
+ err = -ENETDOWN;
+ goto out;
+ }
+ nh->nh_flags |= RTNH_F_DEAD;
+ }
+ err = 0;
out:
- fib_res_put(&res);
- return err;
+ fib_res_put(&res);
+ return err;
+ }
} else {
struct in_device *in_dev;
@@ -551,8 +623,11 @@
if (in_dev == NULL)
return -ENODEV;
if (!(in_dev->dev->flags&IFF_UP)) {
- in_dev_put(in_dev);
- return -ENETDOWN;
+ if (fi->fib_protocol != RTPROT_STATIC) {
+ in_dev_put(in_dev);
+ return -ENETDOWN;
+ }
+ nh->nh_flags |= RTNH_F_DEAD;
}
nh->nh_dev = in_dev->dev;
dev_hold(nh->nh_dev);
@@ -890,8 +965,12 @@
for_nexthops(fi) {
if (nh->nh_flags&RTNH_F_DEAD)
continue;
- if (!flp->oif || flp->oif == nh->nh_oif)
- break;
+ if (flp->oif && flp->oif != nh->nh_oif)
+ continue;
+ if (flp->fl4_gw && flp->fl4_gw != nh->nh_gw &&
+ nh->nh_gw && nh->nh_scope == RT_SCOPE_LINK)
+ continue;
+ break;
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
if (nhsel < fi->fib_nhs) {
@@ -1197,18 +1276,29 @@
prev_fi = fi;
dead = 0;
change_nexthops(fi) {
- if (nh->nh_flags&RTNH_F_DEAD)
- dead++;
- else if (nh->nh_dev == dev &&
- nh->nh_scope != scope) {
- nh->nh_flags |= RTNH_F_DEAD;
+ if (nh->nh_flags&RTNH_F_DEAD) {
+ if (fi->fib_protocol!=RTPROT_STATIC ||
+ nh->nh_dev == NULL ||
+ __in_dev_get_rtnl(nh->nh_dev) == NULL ||
+ nh->nh_dev->flags&IFF_UP)
+ dead++;
+ } else if (nh->nh_dev == dev &&
+ nh->nh_scope != scope) {
+ write_lock_bh(&fib_nhflags_lock);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
- spin_lock_bh(&fib_multipath_lock);
+ spin_lock(&fib_multipath_lock);
+ nh->nh_flags |= RTNH_F_DEAD;
fi->fib_power -= nh->nh_power;
nh->nh_power = 0;
- spin_unlock_bh(&fib_multipath_lock);
+ spin_unlock(&fib_multipath_lock);
+#else
+ nh->nh_flags |= RTNH_F_DEAD;
#endif
- dead++;
+ write_unlock_bh(&fib_nhflags_lock);
+ if (fi->fib_protocol!=RTPROT_STATIC ||
+ force ||
+ __in_dev_get_rtnl(dev) == NULL)
+ dead++;
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
if (force > 1 && nh->nh_dev == dev) {
@@ -1227,11 +1317,8 @@
return ret;
}
-#ifdef CONFIG_IP_ROUTE_MULTIPATH
-
/*
- Dead device goes up. We wake up dead nexthops.
- It takes sense only on multipath routes.
+ Dead device goes up or new address is added. We wake up dead nexthops.
*/
int fib_sync_up(struct net_device *dev)
@@ -1241,8 +1328,10 @@
struct hlist_head *head;
struct hlist_node *node;
struct fib_nh *nh;
- int ret;
+ struct fib_result res;
+ int ret, rep;
+repeat:
if (!(dev->flags&IFF_UP))
return 0;
@@ -1250,6 +1339,7 @@
hash = fib_devindex_hashfn(dev->ifindex);
head = &fib_info_devhash[hash];
ret = 0;
+ rep = 0;
hlist_for_each_entry(nh, node, head, nh_hash) {
struct fib_info *fi = nh->nh_parent;
@@ -1262,19 +1352,37 @@
prev_fi = fi;
alive = 0;
change_nexthops(fi) {
- if (!(nh->nh_flags&RTNH_F_DEAD)) {
- alive++;
+ if (!(nh->nh_flags&RTNH_F_DEAD))
continue;
- }
if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
continue;
if (nh->nh_dev != dev || !__in_dev_get_rtnl(dev))
continue;
+ if (nh->nh_gw && fi->fib_protocol == RTPROT_STATIC) {
+ struct flowi fl = {
+ .nl_u = { .ip4_u =
+ { .daddr = nh->nh_gw,
+ .scope = nh->nh_scope } },
+ .oif = nh->nh_oif,
+ };
+ if (fib_lookup(&fl, &res) != 0)
+ continue;
+ if (res.type != RTN_UNICAST &&
+ res.type != RTN_LOCAL) {
+ fib_res_put(&res);
+ continue;
+ }
+ nh->nh_scope = res.scope;
+ fib_res_put(&res);
+ rep = 1;
+ }
alive++;
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
spin_lock_bh(&fib_multipath_lock);
nh->nh_power = 0;
nh->nh_flags &= ~RTNH_F_DEAD;
spin_unlock_bh(&fib_multipath_lock);
+#endif
} endfor_nexthops(fi)
if (alive > 0) {
@@ -1282,10 +1390,14 @@
ret++;
}
}
+ if (rep)
+ goto repeat;
return ret;
}
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
+
/*
The algorithm is suboptimal, but it provides really
fair weighted route distribution.
@@ -1294,24 +1406,45 @@
void fib_select_multipath(const struct flowi *flp, struct fib_result *res)
{
struct fib_info *fi = res->fi;
- int w;
+ int w, alive;
spin_lock_bh(&fib_multipath_lock);
+ if (flp->oif) {
+ int sel = -1;
+ w = -1;
+ change_nexthops(fi) {
+ if (flp->oif != nh->nh_oif)
+ continue;
+ if (flp->fl4_gw && flp->fl4_gw != nh->nh_gw &&
+ nh->nh_gw && nh->nh_scope == RT_SCOPE_LINK)
+ continue;
+ if (!(nh->nh_flags&RTNH_F_BADSTATE)) {
+ if (nh->nh_power > w) {
+ w = nh->nh_power;
+ sel = nhsel;
+ }
+ }
+ } endfor_nexthops(fi);
+ if (sel >= 0) {
+ spin_unlock_bh(&fib_multipath_lock);
+ res->nh_sel = sel;
+ return;
+ }
+ goto last_resort;
+ }
+
+repeat:
if (fi->fib_power <= 0) {
int power = 0;
change_nexthops(fi) {
- if (!(nh->nh_flags&RTNH_F_DEAD)) {
+ if (!(nh->nh_flags&RTNH_F_BADSTATE)) {
power += nh->nh_weight;
nh->nh_power = nh->nh_weight;
}
} endfor_nexthops(fi);
fi->fib_power = power;
- if (power <= 0) {
- spin_unlock_bh(&fib_multipath_lock);
- /* Race condition: route has just become dead. */
- res->nh_sel = 0;
- return;
- }
+ if (power <= 0)
+ goto last_resort;
}
@@ -1321,20 +1454,40 @@
w = jiffies % fi->fib_power;
+ alive = 0;
change_nexthops(fi) {
- if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
+ if (!(nh->nh_flags&RTNH_F_BADSTATE) && nh->nh_power) {
if ((w -= nh->nh_power) <= 0) {
nh->nh_power--;
fi->fib_power--;
- res->nh_sel = nhsel;
spin_unlock_bh(&fib_multipath_lock);
+ res->nh_sel = nhsel;
return;
}
+ alive = 1;
+ }
+ } endfor_nexthops(fi);
+ if (alive) {
+ fi->fib_power = 0;
+ goto repeat;
+ }
+
+last_resort:
+
+ for_nexthops(fi) {
+ if (!(nh->nh_flags&RTNH_F_DEAD)) {
+ if (flp->oif && flp->oif != nh->nh_oif)
+ continue;
+ if (flp->fl4_gw && flp->fl4_gw != nh->nh_gw &&
+ nh->nh_gw && nh->nh_scope == RT_SCOPE_LINK)
+ continue;
+ spin_unlock_bh(&fib_multipath_lock);
+ res->nh_sel = nhsel;
+ return;
}
} endfor_nexthops(fi);
/* Race condition: route has just become dead. */
- res->nh_sel = 0;
spin_unlock_bh(&fib_multipath_lock);
}
#endif
diff -ur v2.6.14/linux/net/ipv4/netfilter/ip_nat_core.c linux/net/ipv4/netfilter/ip_nat_core.c
--- v2.6.14/linux/net/ipv4/netfilter/ip_nat_core.c 2005-10-29 14:15:09.000000000 +0300
+++ linux/net/ipv4/netfilter/ip_nat_core.c 2005-10-29 18:11:32.887759000 +0300
@@ -591,6 +591,53 @@
EXPORT_SYMBOL_GPL(ip_nat_port_range_to_nfattr);
#endif
+unsigned int
+ip_nat_route_input(unsigned int hooknum,
+ struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ struct sk_buff *skb = *pskb;
+ struct iphdr *iph;
+ struct ip_conntrack *conn;
+ enum ip_conntrack_info ctinfo;
+ enum ip_conntrack_dir dir;
+ unsigned long statusbit;
+ u32 saddr;
+
+ if (!(conn = ip_conntrack_get(skb, &ctinfo)))
+ return NF_ACCEPT;
+
+ if (!(conn->status & IPS_NAT_DONE_MASK))
+ return NF_ACCEPT;
+ dir = CTINFO2DIR(ctinfo);
+ statusbit = IPS_SRC_NAT;
+ if (dir == IP_CT_DIR_REPLY)
+ statusbit ^= IPS_NAT_MASK;
+ if (!(conn->status & statusbit))
+ return NF_ACCEPT;
+
+ if (skb->dst)
+ return NF_ACCEPT;
+
+ if (skb->len < sizeof(struct iphdr))
+ return NF_ACCEPT;
+
+ /* use daddr in other direction as masquerade address (lsrc) */
+ iph = skb->nh.iph;
+ saddr = conn->tuplehash[!dir].tuple.dst.ip;
+ if (saddr == iph->saddr)
+ return NF_ACCEPT;
+
+ if (ip_route_input_lookup(skb, iph->daddr, iph->saddr, iph->tos,
+ skb->dev, saddr))
+ return NF_DROP;
+
+ return NF_ACCEPT;
+}
+EXPORT_SYMBOL_GPL(ip_nat_route_input);
+
static int __init ip_nat_init(void)
{
size_t i;
diff -ur v2.6.14/linux/net/ipv4/netfilter/ip_nat_standalone.c linux/net/ipv4/netfilter/ip_nat_standalone.c
--- v2.6.14/linux/net/ipv4/netfilter/ip_nat_standalone.c 2005-10-29 14:15:09.000000000 +0300
+++ linux/net/ipv4/netfilter/ip_nat_standalone.c 2005-10-29 18:11:32.887759000 +0300
@@ -266,6 +266,14 @@
.priority = NF_IP_PRI_NAT_DST,
};
+/* Before routing, route before mangling */
+static struct nf_hook_ops ip_nat_inr_ops = {
+ .hook = ip_nat_route_input,
+ .pf = PF_INET,
+ .hooknum = NF_IP_PRE_ROUTING,
+ .priority = NF_IP_PRI_LAST-1,
+};
+
/* After packet filtering, change source */
static struct nf_hook_ops ip_nat_out_ops = {
.hook = ip_nat_out,
@@ -330,10 +338,15 @@
printk("ip_nat_init: can't register in hook.\n");
goto cleanup_rule_init;
}
+ ret = nf_register_hook(&ip_nat_inr_ops);
+ if (ret < 0) {
+ printk("ip_nat_init: can't register inr hook.\n");
+ goto cleanup_inops;
+ }
ret = nf_register_hook(&ip_nat_out_ops);
if (ret < 0) {
printk("ip_nat_init: can't register out hook.\n");
- goto cleanup_inops;
+ goto cleanup_inrops;
}
ret = nf_register_hook(&ip_nat_adjust_in_ops);
if (ret < 0) {
@@ -367,6 +380,8 @@
nf_unregister_hook(&ip_nat_adjust_in_ops);
cleanup_outops:
nf_unregister_hook(&ip_nat_out_ops);
+ cleanup_inrops:
+ nf_unregister_hook(&ip_nat_inr_ops);
cleanup_inops:
nf_unregister_hook(&ip_nat_in_ops);
cleanup_rule_init:
diff -ur v2.6.14/linux/net/ipv4/netfilter/ipt_MASQUERADE.c linux/net/ipv4/netfilter/ipt_MASQUERADE.c
--- v2.6.14/linux/net/ipv4/netfilter/ipt_MASQUERADE.c 2005-10-29 14:15:09.000000000 +0300
+++ linux/net/ipv4/netfilter/ipt_MASQUERADE.c 2005-10-29 18:11:32.887759000 +0300
@@ -97,13 +97,31 @@
return NF_ACCEPT;
mr = targinfo;
- rt = (struct rtable *)(*pskb)->dst;
- newsrc = inet_select_addr(out, rt->rt_gateway, RT_SCOPE_UNIVERSE);
- if (!newsrc) {
- printk("MASQUERADE: %s ate my IP address\n", out->name);
- return NF_DROP;
+
+ {
+ struct flowi fl = { .nl_u = { .ip4_u =
+ { .daddr = (*pskb)->nh.iph->daddr,
+ .tos = (RT_TOS((*pskb)->nh.iph->tos) |
+ RTO_CONN),
+ .gw = ((struct rtable *) (*pskb)->dst)->rt_gateway,
+#ifdef CONFIG_IP_ROUTE_FWMARK
+ .fwmark = (*pskb)->nfmark
+#endif
+ } },
+ .oif = out->ifindex };
+ if (ip_route_output_key(&rt, &fl) != 0) {
+ /* Funky routing can do this. */
+ if (net_ratelimit())
+ printk("MASQUERADE:"
+ " No route: Rusty's brain broke!\n");
+ return NF_DROP;
+ }
}
+ newsrc = rt->rt_src;
+ DEBUGP("newsrc = %u.%u.%u.%u\n", NIPQUAD(newsrc));
+ ip_rt_put(rt);
+
write_lock_bh(&masq_lock);
ct->nat.masq_index = out->ifindex;
write_unlock_bh(&masq_lock);
diff -ur v2.6.14/linux/net/ipv4/route.c linux/net/ipv4/route.c
--- v2.6.14/linux/net/ipv4/route.c 2005-10-29 14:15:09.000000000 +0300
+++ linux/net/ipv4/route.c 2005-10-29 18:11:32.889758696 +0300
@@ -1197,6 +1197,7 @@
/* 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);
@@ -1632,6 +1633,7 @@
rth->fl.fl4_fwmark= skb->nfmark;
#endif
rth->fl.fl4_src = saddr;
+ rth->fl.fl4_lsrc = 0;
rth->rt_src = saddr;
#ifdef CONFIG_NET_CLS_ROUTE
rth->u.dst.tclassid = itag;
@@ -1642,6 +1644,7 @@
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;
@@ -1706,7 +1709,7 @@
struct fib_result* res,
struct in_device *in_dev,
u32 daddr, u32 saddr, u32 tos,
- struct rtable **result)
+ u32 lsrc, struct rtable **result)
{
struct rtable *rth;
@@ -1739,6 +1742,7 @@
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;
@@ -1778,6 +1782,7 @@
#endif
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;
@@ -1785,6 +1790,7 @@
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;
@@ -1806,19 +1812,20 @@
struct fib_result* res,
const struct flowi *fl,
struct in_device *in_dev,
- u32 daddr, u32 saddr, u32 tos)
+ u32 daddr, u32 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;
@@ -1831,7 +1838,7 @@
struct fib_result* res,
const struct flowi *fl,
struct in_device *in_dev,
- u32 daddr, u32 saddr, u32 tos)
+ u32 daddr, u32 saddr, u32 tos, u32 lsrc)
{
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
struct rtable* rth = NULL, *rtres;
@@ -1847,7 +1854,7 @@
/* 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++) {
@@ -1859,7 +1866,7 @@
/* create a routing cache entry */
err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos,
- &rth);
+ 0, &rth);
if (err)
return err;
@@ -1879,7 +1886,7 @@
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 */
}
@@ -1895,20 +1902,20 @@
*/
static int ip_route_input_slow(struct sk_buff *skb, u32 daddr, u32 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,
#ifdef CONFIG_IP_ROUTE_FWMARK
.fwmark = skb->nfmark
#endif
} },
- .iif = dev->ifindex };
+ .iif = lsrc? loopback_dev.ifindex : dev->ifindex };
unsigned flags = 0;
u32 itag = 0;
struct rtable * rth;
@@ -1941,6 +1948,12 @@
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.
*/
@@ -1950,6 +1963,10 @@
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);
@@ -1974,7 +1991,7 @@
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)
@@ -1989,6 +2006,8 @@
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);
@@ -2031,6 +2050,7 @@
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;
@@ -2080,8 +2100,9 @@
goto e_inval;
}
-int ip_route_input(struct sk_buff *skb, u32 daddr, u32 saddr,
- u8 tos, struct net_device *dev)
+static inline int
+ip_route_input_cached(struct sk_buff *skb, u32 daddr, u32 saddr,
+ u8 tos, struct net_device *dev, u32 lsrc)
{
struct rtable * rth;
unsigned hash;
@@ -2096,6 +2117,7 @@
if (rth->fl.fl4_dst == daddr &&
rth->fl.fl4_src == saddr &&
rth->fl.iif == iif &&
+ rth->fl.fl4_lsrc == lsrc &&
rth->fl.oif == 0 &&
#ifdef CONFIG_IP_ROUTE_FWMARK
rth->fl.fl4_fwmark == skb->nfmark &&
@@ -2144,7 +2166,19 @@
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,
@@ -2223,6 +2257,7 @@
rth->fl.fl4_tos = tos;
rth->fl.fl4_src = oldflp->fl4_src;
rth->fl.oif = oldflp->oif;
+ rth->fl.fl4_gw = oldflp->fl4_gw;
#ifdef CONFIG_IP_ROUTE_FWMARK
rth->fl.fl4_fwmark= oldflp->fl4_fwmark;
#endif
@@ -2370,6 +2405,7 @@
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 :
@@ -2475,6 +2511,7 @@
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;
@@ -2482,7 +2519,7 @@
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.
@@ -2522,6 +2559,7 @@
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;
@@ -2529,13 +2567,12 @@
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);
@@ -2572,6 +2609,7 @@
rth->fl.fl4_src == flp->fl4_src &&
rth->fl.iif == 0 &&
rth->fl.oif == flp->oif &&
+ rth->fl.fl4_gw == flp->fl4_gw &&
#ifdef CONFIG_IP_ROUTE_FWMARK
rth->fl.fl4_fwmark == flp->fl4_fwmark &&
#endif
@@ -3211,3 +3249,4 @@
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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