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openwrt/target/linux/generic-2.4/patches/700-multiple_default_gateways.patch
Andy Boyett 88e632d853 generic-2.4: refresh patches 
SVN-Revision: 15860
2009-05-15 10:36:04 +00:00

1285 lines
35 KiB
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--- a/include/linux/netfilter_ipv4/ip_nat.h
+++ b/include/linux/netfilter_ipv4/ip_nat.h
@@ -121,5 +121,13 @@ extern int ip_nat_used_tuple(const struc
extern u_int16_t ip_nat_cheat_check(u_int32_t oldvalinv,
u_int32_t newval,
u_int16_t oldcheck);
+
+/* 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 *));
+
#endif /*__KERNEL__*/
#endif
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -234,6 +234,8 @@ struct rtnexthop
#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 */
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -162,7 +162,8 @@ static inline int fib_lookup(const struc
static inline void fib_select_default(const struct rt_key *key, 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)
main_table->tb_select_default(main_table, key, res);
}
@@ -174,6 +175,7 @@ extern struct fib_table * fib_tables[RT_
extern int fib_lookup(const struct rt_key *key, 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)
{
@@ -275,5 +277,6 @@ static inline void fib_res_put(struct fi
#endif
}
+extern rwlock_t fib_nhflags_lock;
#endif /* _NET_FIB_H */
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -49,6 +49,8 @@ struct rt_key
{
__u32 dst;
__u32 src;
+ __u32 lsrc;
+ __u32 gw;
int iif;
int oif;
#ifdef CONFIG_IP_ROUTE_FWMARK
@@ -128,6 +130,7 @@ extern void ip_rt_advice(struct rtable
extern void rt_cache_flush(int how);
extern int ip_route_output_key(struct rtable **, const struct rt_key *key);
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_update_pmtu(struct dst_entry *dst, unsigned mtu);
extern void ip_rt_send_redirect(struct sk_buff *skb);
@@ -148,6 +151,15 @@ static inline int ip_route_output(struct
}
+static inline int
+ip_route_output_lookup(struct rtable **rp,
+ u32 daddr, u32 saddr, u32 tos, int oif, u32 gw)
+{
+ struct rt_key key = { dst:daddr, src:saddr, gw:gw, oif:oif, tos:tos };
+
+ return ip_route_output_key(rp, &key);
+}
+
static inline void ip_rt_put(struct rtable * rt)
{
if (rt)
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -54,6 +54,8 @@
struct fib_table *local_table;
struct fib_table *main_table;
+#define FIB_RES_TABLE(r) (RT_TABLE_MAIN)
+
#else
#define RT_TABLE_MIN 1
@@ -71,6 +73,7 @@ struct fib_table *__fib_new_table(int id
return tb;
}
+#define FIB_RES_TABLE(r) (fib_result_table(r))
#endif /* CONFIG_IP_MULTIPLE_TABLES */
@@ -209,6 +212,9 @@ int fib_validate_source(u32 src, u32 dst
struct in_device *in_dev;
struct rt_key key;
struct fib_result res;
+ int table;
+ unsigned char prefixlen;
+ unsigned char scope;
int no_addr, rpf;
int ret;
@@ -216,6 +222,7 @@ int fib_validate_source(u32 src, u32 dst
key.src = dst;
key.tos = tos;
key.oif = 0;
+ key.gw = 0;
key.iif = oif;
key.scope = RT_SCOPE_UNIVERSE;
@@ -237,31 +244,35 @@ int fib_validate_source(u32 src, u32 dst
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;
key.oif = dev->ifindex;
ret = 0;
if (fib_lookup(&key, &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:
@@ -579,9 +590,7 @@ static int fib_inetaddr_event(struct not
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:
@@ -617,9 +626,7 @@ static int fib_netdev_event(struct notif
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:
--- a/net/ipv4/fib_hash.c
+++ b/net/ipv4/fib_hash.c
@@ -71,6 +71,7 @@ struct fib_node
struct fib_info *fn_info;
#define FIB_INFO(f) ((f)->fn_info)
fn_key_t fn_key;
+ int fn_last_dflt;
u8 fn_tos;
u8 fn_type;
u8 fn_scope;
@@ -336,72 +337,123 @@ out:
return err;
}
-static int fn_hash_last_dflt=-1;
-
-static int fib_detect_death(struct fib_info *fi, int order,
- struct fib_info **last_resort, int *last_idx)
+static int fib_detect_death(struct fib_info *fi, int order, int last_dflt,
+ struct fib_info **last_resort, int *last_idx,
+ int *last_nhsel, const struct rt_key *key)
{
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 (key->oif && key->oif != nh->nh_oif)
+ continue;
+ if (key->gw && key->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);
+ 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 = key->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 != last_dflt)) {
+ dead = 0;
+ goto setfl;
+ }
+ if (!(state&NUD_VALID))
+ flag = 1;
+ if (!dead)
+ goto setfl;
+ if ((state&NUD_VALID) ||
+ (*last_idx<0 && order >= last_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);
}
- if (state==NUD_REACHABLE)
- return 0;
- if ((state&NUD_VALID) && order != fn_hash_last_dflt)
- return 0;
- if ((state&NUD_VALID) ||
- (*last_idx<0 && order > fn_hash_last_dflt)) {
- *last_resort = fi;
- *last_idx = order;
- }
- return 1;
+ /* } endfor_nexthops(fi) */
+
+ return dead;
}
static void
fn_hash_select_default(struct fib_table *tb, const struct rt_key *key, struct fib_result *res)
{
- int order, last_idx;
- struct fib_node *f;
+ int order, last_idx, last_dflt, last_nhsel;
+ struct fib_node *f, *first_node;
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];
+ fn_key_t k;
if (fz == NULL)
return;
+ k = fz_key(key->dst, fz);
+ last_dflt = -2;
+ first_node = NULL;
last_idx = -1;
last_resort = NULL;
+ last_nhsel = 0;
order = -1;
read_lock(&fib_hash_lock);
- for (f = fz->fz_hash[0]; f; f = f->fn_next) {
+ for (f = fz_chain(k, fz); f; f = f->fn_next) {
struct fib_info *next_fi = FIB_INFO(f);
- if ((f->fn_state&FN_S_ZOMBIE) ||
+ if (!fn_key_eq(k, f->fn_key) ||
+ (f->fn_state&FN_S_ZOMBIE) ||
f->fn_scope != res->scope ||
+#ifdef CONFIG_IP_ROUTE_TOS
+ (f->fn_tos && f->fn_tos != key->tos) ||
+#endif
f->fn_type != RTN_UNICAST)
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;
f->fn_state |= FN_S_ACCESSED;
- if (fi == NULL) {
- if (next_fi != res->fi)
- break;
- } else if (!fib_detect_death(fi, order, &last_resort, &last_idx)) {
+ if (!first_node) {
+ last_dflt = f->fn_last_dflt;
+ first_node = f;
+ }
+ if (fi && !fib_detect_death(fi, order, last_dflt,
+ &last_resort, &last_idx, &last_nhsel, key)) {
if (res->fi)
fib_info_put(res->fi);
res->fi = fi;
atomic_inc(&fi->fib_clntref);
- fn_hash_last_dflt = order;
+ first_node->fn_last_dflt = order;
goto out;
}
fi = next_fi;
@@ -409,16 +461,25 @@ fn_hash_select_default(struct fib_table
}
if (order<=0 || fi==NULL) {
- fn_hash_last_dflt = -1;
+ if (fi && fi->fib_nhs > 1 &&
+ fib_detect_death(fi, order, last_dflt,
+ &last_resort, &last_idx, &last_nhsel, key) &&
+ 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_node) first_node->fn_last_dflt = -1;
goto out;
}
- if (!fib_detect_death(fi, order, &last_resort, &last_idx)) {
+ if (!fib_detect_death(fi, order, last_dflt, &last_resort, &last_idx,
+ &last_nhsel, key)) {
if (res->fi)
fib_info_put(res->fi);
res->fi = fi;
atomic_inc(&fi->fib_clntref);
- fn_hash_last_dflt = order;
+ first_node->fn_last_dflt = order;
goto out;
}
@@ -428,8 +489,11 @@ fn_hash_select_default(struct fib_table
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_node->fn_last_dflt = last_idx;
}
- fn_hash_last_dflt = last_idx;
out:
read_unlock(&fib_hash_lock);
}
@@ -589,6 +653,7 @@ replace:
memset(new_f, 0, sizeof(struct fib_node));
+ new_f->fn_last_dflt = -1;
new_f->fn_key = key;
#ifdef CONFIG_IP_ROUTE_TOS
new_f->fn_tos = tos;
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -307,6 +307,11 @@ static void fib_rules_attach(struct net_
}
}
+int fib_result_table(struct fib_result *res)
+{
+ return res->r->r_table;
+}
+
int fib_lookup(const struct rt_key *key, struct fib_result *res)
{
int err;
@@ -371,8 +376,10 @@ FRprintk("FAILURE\n");
void fib_select_default(const struct rt_key *key, 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) {
+ if (res->r &&
+ (res->r->r_action == RTN_UNICAST || res->r->r_action == RTN_NAT) &&
+ ((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, key, res);
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -48,6 +48,7 @@
static struct fib_info *fib_info_list;
static rwlock_t fib_info_lock = RW_LOCK_UNLOCKED;
int fib_info_cnt;
+rwlock_t fib_nhflags_lock = RW_LOCK_UNLOCKED;
#define for_fib_info() { struct fib_info *fi; \
for (fi = fib_info_list; fi; fi = fi->fib_next)
@@ -150,7 +151,7 @@ static __inline__ int nh_comp(const stru
#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);
@@ -166,7 +167,7 @@ static __inline__ struct fib_info * fib_
nfi->fib_prefsrc == fi->fib_prefsrc &&
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;
} endfor_fib_info();
@@ -365,8 +366,11 @@ static int fib_check_nh(const struct rtm
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;
@@ -380,23 +384,48 @@ static int fib_check_nh(const struct rtm
/* It is not necessary, but requires a bit of thinking */
if (key.scope < RT_SCOPE_LINK)
key.scope = RT_SCOPE_LINK;
- if ((err = fib_lookup(&key, &res)) != 0)
- return err;
- 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;
+
+ err = fib_lookup(&key, &res);
+ 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;
@@ -407,8 +436,11 @@ out:
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);
@@ -606,8 +638,12 @@ fib_semantic_match(int type, struct fib_
for_nexthops(fi) {
if (nh->nh_flags&RTNH_F_DEAD)
continue;
- if (!key->oif || key->oif == nh->nh_oif)
- break;
+ if (key->oif && key->oif != nh->nh_oif)
+ continue;
+ if (key->gw && key->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) {
@@ -873,22 +909,35 @@ int fib_sync_down(u32 local, struct net_
if (local && fi->fib_prefsrc == local) {
fi->fib_flags |= RTNH_F_DEAD;
ret++;
- } else if (dev && fi->fib_nhs) {
+ } else if (fi->fib_nhs) {
int 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(nh->nh_dev) ||
+ nh->nh_dev->flags&IFF_UP)
+ dead++;
+ } else if ((nh->nh_dev == dev && dev &&
+ nh->nh_scope != scope) ||
+ (local == nh->nh_gw && local &&
+ nh->nh_oif)) {
+ 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 ||
+ (dev && __in_dev_get(dev) == NULL))
+ dead++;
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
if (force > 1 && nh->nh_dev == dev) {
@@ -906,37 +955,55 @@ int fib_sync_down(u32 local, struct net_
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)
{
- int ret = 0;
+ struct rt_key key;
+ struct fib_result res;
+ int ret, rep;
+repeat:
if (!(dev->flags&IFF_UP))
return 0;
+ ret = 0;
+ rep = 0;
for_fib_info() {
int 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(dev) == NULL)
continue;
+ if (nh->nh_gw && fi->fib_protocol == RTPROT_STATIC) {
+ memset(&key, 0, sizeof(key));
+ key.dst = nh->nh_gw;
+ key.oif = nh->nh_oif;
+ key.scope = nh->nh_scope;
+ if (fib_lookup(&key, &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) {
@@ -944,9 +1011,13 @@ int fib_sync_up(struct net_device *dev)
ret++;
}
} endfor_fib_info();
+ if (rep)
+ goto repeat;
return ret;
}
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
+
/*
The algorithm is suboptimal, but it provides really
fair weighted route distribution.
@@ -955,24 +1026,45 @@ int fib_sync_up(struct net_device *dev)
void fib_select_multipath(const struct rt_key *key, struct fib_result *res)
{
struct fib_info *fi = res->fi;
- int w;
+ int w, alive;
spin_lock_bh(&fib_multipath_lock);
+ if (key->oif) {
+ int sel = -1;
+ w = -1;
+ change_nexthops(fi) {
+ if (key->oif != nh->nh_oif)
+ continue;
+ if (key->gw && key->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;
}
@@ -982,20 +1074,40 @@ void fib_select_multipath(const struct r
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 (key->oif && key->oif != nh->nh_oif)
+ continue;
+ if (key->gw && key->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
--- a/net/ipv4/ip_nat_dumb.c
+++ b/net/ipv4/ip_nat_dumb.c
@@ -124,6 +124,7 @@ ip_do_nat(struct sk_buff *skb)
key.dst = ciph->saddr;
key.iif = skb->dev->ifindex;
key.oif = 0;
+ key.gw = 0;
#ifdef CONFIG_IP_ROUTE_TOS
key.tos = RT_TOS(ciph->tos);
#endif
--- a/net/ipv4/netfilter/ip_fw_compat_masq.c
+++ b/net/ipv4/netfilter/ip_fw_compat_masq.c
@@ -41,6 +41,10 @@ do_masquerade(struct sk_buff **pskb, con
enum ip_conntrack_info ctinfo;
struct ip_conntrack *ct;
unsigned int ret;
+ struct rtable *rt, *skb_rt;
+ struct net_device *skb_dev;
+ __u32 saddr;
+ int new;
/* Sorry, only ICMP, TCP and UDP. */
if (iph->protocol != IPPROTO_ICMP
@@ -64,22 +68,28 @@ do_masquerade(struct sk_buff **pskb, con
}
info = &ct->nat.info;
+ iph = (*pskb)->nh.iph;
+ saddr = iph->saddr;
+ new = 0;
WRITE_LOCK(&ip_nat_lock);
/* Setup the masquerade, if not already */
if (!info->initialized) {
u_int32_t newsrc;
- struct rtable *rt;
struct ip_nat_multi_range range;
+ skb_rt = (struct rtable *) (*pskb)->dst;
+ skb_dev = skb_rt->u.dst.dev;
/* Pass 0 instead of saddr, since it's going to be changed
anyway. */
- if (ip_route_output(&rt, iph->daddr, 0, 0, 0) != 0) {
+ if (ip_route_output_lookup(&rt, iph->daddr, 0, RT_TOS(iph->tos),
+ skb_dev? skb_dev->ifindex : 0,
+ skb_dev? skb_rt->rt_gateway : 0) != 0) {
+ WRITE_UNLOCK(&ip_nat_lock);
DEBUGP("ipnat_rule_masquerade: Can't reroute.\n");
return NF_DROP;
}
- newsrc = inet_select_addr(rt->u.dst.dev, rt->rt_gateway,
- RT_SCOPE_UNIVERSE);
+ newsrc = rt->rt_src;
ip_rt_put(rt);
range = ((struct ip_nat_multi_range)
{ 1,
@@ -92,11 +102,31 @@ do_masquerade(struct sk_buff **pskb, con
WRITE_UNLOCK(&ip_nat_lock);
return ret;
}
+ new = 1;
} else
DEBUGP("Masquerading already done on this conn.\n");
WRITE_UNLOCK(&ip_nat_lock);
- return do_bindings(ct, ctinfo, info, NF_IP_POST_ROUTING, pskb);
+ ret = do_bindings(ct, ctinfo, info, NF_IP_POST_ROUTING, pskb);
+ if (ret != NF_ACCEPT || saddr == (*pskb)->nh.iph->saddr || new)
+ return ret;
+
+ iph = (*pskb)->nh.iph;
+ if (ip_route_output(&rt, iph->daddr, iph->saddr, RT_TOS(iph->tos), 0) != 0)
+ return NF_DROP;
+
+ skb_rt = (struct rtable *) (*pskb)->dst;
+ skb_dev = skb_rt->u.dst.dev;
+ if (skb_dev != rt->u.dst.dev || rt->rt_gateway != skb_rt->rt_gateway) {
+ if (skb_dev != rt->u.dst.dev) {
+ /* TODO: check the new mtu and reply FRAG_NEEDED */
+ }
+ dst_release((*pskb)->dst);
+ (*pskb)->dst = &rt->u.dst;
+ } else {
+ ip_rt_put(rt);
+ }
+ return NF_ACCEPT;
}
void
--- a/net/ipv4/netfilter/ip_nat_core.c
+++ b/net/ipv4/netfilter/ip_nat_core.c
@@ -994,6 +994,60 @@ icmp_reply_translation(struct sk_buff *s
return NF_ACCEPT;
}
+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 *ct;
+ enum ip_conntrack_info ctinfo;
+ struct ip_nat_info *info;
+ enum ip_conntrack_dir dir;
+ __u32 saddr;
+ int i;
+
+ if (!(ct = ip_conntrack_get(skb, &ctinfo)))
+ return NF_ACCEPT;
+
+ info = &ct->nat.info;
+ if (!info->initialized)
+ return NF_ACCEPT;
+
+ if (skb->dst)
+ return NF_ACCEPT;
+
+ if (skb->len < sizeof(struct iphdr))
+ return NF_ACCEPT;
+
+ iph = skb->nh.iph;
+ saddr = iph->saddr;
+ hooknum = NF_IP_POST_ROUTING;
+ dir = CTINFO2DIR(ctinfo);
+
+ READ_LOCK(&ip_nat_lock);
+ for (i = 0; i < info->num_manips; i++) {
+ if (info->manips[i].direction == dir
+ && info->manips[i].hooknum == hooknum
+ && info->manips[i].maniptype == IP_NAT_MANIP_SRC) {
+ saddr = info->manips[i].manip.ip;
+ }
+ }
+ READ_UNLOCK(&ip_nat_lock);
+
+ 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;
+}
+
int __init ip_nat_init(void)
{
size_t i;
--- a/net/ipv4/netfilter/ip_nat_standalone.c
+++ b/net/ipv4/netfilter/ip_nat_standalone.c
@@ -245,6 +245,9 @@ ip_nat_local_fn(unsigned int hooknum,
/* Before packet filtering, change destination */
static struct nf_hook_ops ip_nat_in_ops
= { { NULL, NULL }, ip_nat_in, PF_INET, NF_IP_PRE_ROUTING, NF_IP_PRI_NAT_DST };
+/* Before routing, route before mangling */
+static struct nf_hook_ops ip_nat_inr_ops
+= { { NULL, NULL }, ip_nat_route_input, PF_INET, NF_IP_PRE_ROUTING, NF_IP_PRI_LAST-1 };
/* After packet filtering, change source */
static struct nf_hook_ops ip_nat_out_ops
= { { NULL, NULL }, ip_nat_out, PF_INET, NF_IP_POST_ROUTING, NF_IP_PRI_NAT_SRC};
@@ -313,10 +316,15 @@ static int init_or_cleanup(int init)
printk("ip_nat_init: can't register in hook.\n");
goto cleanup_nat;
}
+ 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_local_out_ops);
if (ret < 0) {
@@ -336,6 +344,8 @@ static int init_or_cleanup(int init)
nf_unregister_hook(&ip_nat_local_out_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_nat:
--- a/net/ipv4/netfilter/ipt_MASQUERADE.c
+++ b/net/ipv4/netfilter/ipt_MASQUERADE.c
@@ -87,7 +87,8 @@ masquerade_target(struct sk_buff **pskb,
key.dst = (*pskb)->nh.iph->daddr;
key.src = 0; /* Unknown: that's what we're trying to establish */
key.tos = RT_TOS((*pskb)->nh.iph->tos)|RTO_CONN;
- key.oif = 0;
+ key.oif = out->ifindex;
+ key.gw = ((struct rtable *) (*pskb)->dst)->rt_gateway;
#ifdef CONFIG_IP_ROUTE_FWMARK
key.fwmark = (*pskb)->nfmark;
#endif
@@ -98,13 +99,6 @@ masquerade_target(struct sk_buff **pskb,
" No route: Rusty's brain broke!\n");
return NF_DROP;
}
- if (rt->u.dst.dev != out) {
- if (net_ratelimit())
- printk("MASQUERADE:"
- " Route sent us somewhere else.\n");
- ip_rt_put(rt);
- return NF_DROP;
- }
newsrc = rt->rt_src;
DEBUGP("newsrc = %u.%u.%u.%u\n", NIPQUAD(newsrc));
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -919,6 +919,7 @@ void ip_rt_redirect(u32 old_gw, u32 dadd
/* Gateway is different ... */
rt->rt_gateway = new_gw;
+ if (rt->key.gw) rt->key.gw = new_gw;
/* Redirect received -> path was valid */
dst_confirm(&rth->u.dst);
@@ -1343,6 +1344,7 @@ static int ip_route_input_mc(struct sk_b
rth->key.fwmark = skb->nfmark;
#endif
rth->key.src = saddr;
+ rth->key.lsrc = 0;
rth->rt_src = saddr;
#ifdef CONFIG_IP_ROUTE_NAT
rth->rt_dst_map = daddr;
@@ -1356,6 +1358,7 @@ static int ip_route_input_mc(struct sk_b
rth->u.dst.dev = &loopback_dev;
dev_hold(rth->u.dst.dev);
rth->key.oif = 0;
+ rth->key.gw = 0;
rth->rt_gateway = daddr;
rth->rt_spec_dst= spec_dst;
rth->rt_type = RTN_MULTICAST;
@@ -1395,7 +1398,7 @@ e_inval:
*/
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 rt_key key;
struct fib_result res;
@@ -1415,16 +1418,17 @@ int ip_route_input_slow(struct sk_buff *
goto out;
key.dst = daddr;
- key.src = saddr;
+ key.src = lsrc? : saddr;
key.tos = tos;
#ifdef CONFIG_IP_ROUTE_FWMARK
key.fwmark = skb->nfmark;
#endif
- key.iif = dev->ifindex;
+ key.iif = lsrc? loopback_dev.ifindex : dev->ifindex;
key.oif = 0;
+ key.gw = 0;
key.scope = RT_SCOPE_UNIVERSE;
- hash = rt_hash_code(daddr, saddr ^ (key.iif << 5), tos);
+ hash = rt_hash_code(daddr, saddr ^ (dev->ifindex << 5), tos);
/* Check for the most weird martians, which can be not detected
by fib_lookup.
@@ -1445,6 +1449,12 @@ int ip_route_input_slow(struct sk_buff *
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.
*/
@@ -1454,6 +1464,10 @@ int ip_route_input_slow(struct sk_buff *
goto no_route;
}
free_res = 1;
+ if (lsrc && res.type != RTN_UNICAST && res.type != RTN_NAT)
+ goto e_inval;
+ key.iif = dev->ifindex;
+ key.src = saddr;
rt_cache_stat[smp_processor_id()].in_slow_tot++;
@@ -1464,7 +1478,7 @@ int ip_route_input_slow(struct sk_buff *
if (1) {
u32 src_map = saddr;
- if (res.r)
+ if (res.r && !lsrc)
src_map = fib_rules_policy(saddr, &res, &flags);
if (res.type == RTN_NAT) {
@@ -1503,8 +1517,9 @@ int ip_route_input_slow(struct sk_buff *
if (res.type != RTN_UNICAST)
goto martian_destination;
+ fib_select_default(&key, &res);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
- if (res.fi->fib_nhs > 1 && key.oif == 0)
+ if (res.fi->fib_nhs > 1)
fib_select_multipath(&key, &res);
#endif
out_dev = in_dev_get(FIB_RES_DEV(res));
@@ -1524,6 +1539,7 @@ int ip_route_input_slow(struct sk_buff *
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;
@@ -1550,6 +1566,7 @@ int ip_route_input_slow(struct sk_buff *
#endif
rth->key.src = saddr;
rth->rt_src = saddr;
+ rth->key.lsrc = lsrc;
rth->rt_gateway = daddr;
#ifdef CONFIG_IP_ROUTE_NAT
rth->rt_src_map = key.src;
@@ -1562,6 +1579,7 @@ int ip_route_input_slow(struct sk_buff *
rth->u.dst.dev = out_dev->dev;
dev_hold(rth->u.dst.dev);
rth->key.oif = 0;
+ rth->key.gw = 0;
rth->rt_spec_dst= spec_dst;
rth->u.dst.input = ip_forward;
@@ -1572,7 +1590,8 @@ int ip_route_input_slow(struct sk_buff *
rth->rt_flags = flags;
#ifdef CONFIG_NET_FASTROUTE
- if (netdev_fastroute && !(flags&(RTCF_NAT|RTCF_MASQ|RTCF_DOREDIRECT))) {
+ if (netdev_fastroute && !(flags&(RTCF_NAT|RTCF_MASQ|RTCF_DOREDIRECT)) &&
+ !lsrc) {
struct net_device *odev = rth->u.dst.dev;
if (odev != dev &&
dev->accept_fastpath &&
@@ -1595,6 +1614,8 @@ out: return err;
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);
@@ -1627,6 +1648,7 @@ local_input:
#endif
rth->key.src = saddr;
rth->rt_src = saddr;
+ rth->key.lsrc = 0;
#ifdef CONFIG_IP_ROUTE_NAT
rth->rt_dst_map = key.dst;
rth->rt_src_map = key.src;
@@ -1639,6 +1661,7 @@ local_input:
rth->u.dst.dev = &loopback_dev;
dev_hold(rth->u.dst.dev);
rth->key.oif = 0;
+ rth->key.gw = 0;
rth->rt_gateway = daddr;
rth->rt_spec_dst= spec_dst;
rth->u.dst.input= ip_local_deliver;
@@ -1704,8 +1727,9 @@ martian_source:
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;
@@ -1719,6 +1743,7 @@ int ip_route_input(struct sk_buff *skb,
if (rth->key.dst == daddr &&
rth->key.src == saddr &&
rth->key.iif == iif &&
+ rth->key.lsrc == lsrc &&
rth->key.oif == 0 &&
#ifdef CONFIG_IP_ROUTE_FWMARK
rth->key.fwmark == skb->nfmark &&
@@ -1766,9 +1791,21 @@ int ip_route_input(struct sk_buff *skb,
read_unlock(&inetdev_lock);
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);
+}
+
/*
* Major route resolver routine.
*/
@@ -1791,6 +1828,7 @@ int ip_route_output_slow(struct rtable *
key.tos = tos & IPTOS_RT_MASK;
key.iif = loopback_dev.ifindex;
key.oif = oldkey->oif;
+ key.gw = oldkey->gw;
#ifdef CONFIG_IP_ROUTE_FWMARK
key.fwmark = oldkey->fwmark;
#endif
@@ -1880,6 +1918,7 @@ int ip_route_output_slow(struct rtable *
dev_out = &loopback_dev;
dev_hold(dev_out);
key.oif = loopback_dev.ifindex;
+ key.gw = 0;
res.type = RTN_LOCAL;
flags |= RTCF_LOCAL;
goto make_route;
@@ -1887,7 +1926,7 @@ int ip_route_output_slow(struct rtable *
if (fib_lookup(&key, &res)) {
res.fi = NULL;
- if (oldkey->oif) {
+ if (oldkey->oif && dev_out->flags&IFF_UP) {
/* Apparently, routing tables are wrong. Assume,
that the destination is on link.
@@ -1930,6 +1969,7 @@ int ip_route_output_slow(struct rtable *
dev_out = &loopback_dev;
dev_hold(dev_out);
key.oif = dev_out->ifindex;
+ key.gw = 0;
if (res.fi)
fib_info_put(res.fi);
res.fi = NULL;
@@ -1937,13 +1977,12 @@ int ip_route_output_slow(struct rtable *
goto make_route;
}
+ if (res.type == RTN_UNICAST)
+ fib_select_default(&key, &res);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
- if (res.fi->fib_nhs > 1 && key.oif == 0)
+ if (res.fi->fib_nhs > 1)
fib_select_multipath(&key, &res);
- else
#endif
- if (!res.prefixlen && res.type == RTN_UNICAST && !key.oif)
- fib_select_default(&key, &res);
if (!key.src)
key.src = FIB_RES_PREFSRC(res);
@@ -2001,7 +2040,9 @@ make_route:
rth->key.tos = tos;
rth->key.src = oldkey->src;
rth->key.iif = 0;
+ rth->key.lsrc = 0;
rth->key.oif = oldkey->oif;
+ rth->key.gw = oldkey->gw;
#ifdef CONFIG_IP_ROUTE_FWMARK
rth->key.fwmark = oldkey->fwmark;
#endif
@@ -2080,6 +2121,7 @@ int ip_route_output_key(struct rtable **
rth->key.src == key->src &&
rth->key.iif == 0 &&
rth->key.oif == key->oif &&
+ rth->key.gw == key->gw &&
#ifdef CONFIG_IP_ROUTE_FWMARK
rth->key.fwmark == key->fwmark &&
#endif
--- a/net/netsyms.c
+++ b/net/netsyms.c
@@ -260,6 +260,7 @@ EXPORT_SYMBOL(inet_register_protosw);
EXPORT_SYMBOL(inet_unregister_protosw);
EXPORT_SYMBOL(ip_route_output_key);
EXPORT_SYMBOL(ip_route_input);
+EXPORT_SYMBOL(ip_route_input_lookup);
EXPORT_SYMBOL(icmp_send);
EXPORT_SYMBOL(icmp_statistics);
EXPORT_SYMBOL(icmp_err_convert);
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