summaryrefslogtreecommitdiff
path: root/net/ipv4
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/devinet.c2
-rw-r--r--net/ipv4/fib_frontend.c29
-rw-r--r--net/ipv4/fib_rules.c5
-rw-r--r--net/ipv4/fib_semantics.c93
-rw-r--r--net/ipv4/fib_trie.c6
-rw-r--r--net/ipv4/netfilter/ipt_rpfilter.c2
-rw-r--r--net/ipv4/route.c10
7 files changed, 110 insertions, 37 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 419d23c53ec7..7498716e8f54 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -2169,6 +2169,8 @@ static struct devinet_sysctl_table {
"igmpv2_unsolicited_report_interval"),
DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
"igmpv3_unsolicited_report_interval"),
+ DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
+ "ignore_routes_with_linkdown"),
DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 872494e6e6eb..6bbc54940eb4 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -280,7 +280,7 @@ __be32 fib_compute_spec_dst(struct sk_buff *skb)
fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
fl4.flowi4_scope = scope;
fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0;
- if (!fib_lookup(net, &fl4, &res))
+ if (!fib_lookup(net, &fl4, &res, 0))
return FIB_RES_PREFSRC(net, res);
} else {
scope = RT_SCOPE_LINK;
@@ -319,7 +319,7 @@ static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0;
net = dev_net(dev);
- if (fib_lookup(net, &fl4, &res))
+ if (fib_lookup(net, &fl4, &res, 0))
goto last_resort;
if (res.type != RTN_UNICAST &&
(res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev)))
@@ -354,7 +354,7 @@ static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
fl4.flowi4_oif = dev->ifindex;
ret = 0;
- if (fib_lookup(net, &fl4, &res) == 0) {
+ if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) {
if (res.type == RTN_UNICAST)
ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
}
@@ -1063,9 +1063,9 @@ static void nl_fib_lookup_exit(struct net *net)
net->ipv4.fibnl = NULL;
}
-static void fib_disable_ip(struct net_device *dev, int force)
+static void fib_disable_ip(struct net_device *dev, unsigned long event)
{
- if (fib_sync_down_dev(dev, force))
+ if (fib_sync_down_dev(dev, event))
fib_flush(dev_net(dev));
rt_cache_flush(dev_net(dev));
arp_ifdown(dev);
@@ -1081,7 +1081,7 @@ static int fib_inetaddr_event(struct notifier_block *this, unsigned long event,
case NETDEV_UP:
fib_add_ifaddr(ifa);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
- fib_sync_up(dev);
+ fib_sync_up(dev, RTNH_F_DEAD);
#endif
atomic_inc(&net->ipv4.dev_addr_genid);
rt_cache_flush(dev_net(dev));
@@ -1093,7 +1093,7 @@ static int fib_inetaddr_event(struct notifier_block *this, unsigned long event,
/* Last address was deleted from this interface.
* Disable IP.
*/
- fib_disable_ip(dev, 1);
+ fib_disable_ip(dev, event);
} else {
rt_cache_flush(dev_net(dev));
}
@@ -1107,9 +1107,10 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct in_device *in_dev;
struct net *net = dev_net(dev);
+ unsigned int flags;
if (event == NETDEV_UNREGISTER) {
- fib_disable_ip(dev, 2);
+ fib_disable_ip(dev, event);
rt_flush_dev(dev);
return NOTIFY_DONE;
}
@@ -1124,16 +1125,22 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
fib_add_ifaddr(ifa);
} endfor_ifa(in_dev);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
- fib_sync_up(dev);
+ fib_sync_up(dev, RTNH_F_DEAD);
#endif
atomic_inc(&net->ipv4.dev_addr_genid);
rt_cache_flush(net);
break;
case NETDEV_DOWN:
- fib_disable_ip(dev, 0);
+ fib_disable_ip(dev, event);
break;
- case NETDEV_CHANGEMTU:
case NETDEV_CHANGE:
+ flags = dev_get_flags(dev);
+ if (flags & (IFF_RUNNING | IFF_LOWER_UP))
+ fib_sync_up(dev, RTNH_F_LINKDOWN);
+ else
+ fib_sync_down_dev(dev, event);
+ /* fall through */
+ case NETDEV_CHANGEMTU:
rt_cache_flush(net);
break;
}
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index 56151982f74e..18123d50f576 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -47,11 +47,12 @@ struct fib4_rule {
#endif
};
-int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res)
+int __fib_lookup(struct net *net, struct flowi4 *flp,
+ struct fib_result *res, unsigned int flags)
{
struct fib_lookup_arg arg = {
.result = res,
- .flags = FIB_LOOKUP_NOREF,
+ .flags = flags,
};
int err;
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 28ec3c1823bf..3bfccd83551c 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -266,7 +266,7 @@ static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi)
#ifdef CONFIG_IP_ROUTE_CLASSID
nh->nh_tclassid != onh->nh_tclassid ||
#endif
- ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_F_DEAD))
+ ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_COMPARE_MASK))
return -1;
onh++;
} endfor_nexthops(fi);
@@ -318,7 +318,7 @@ static struct fib_info *fib_find_info(const struct fib_info *nfi)
nfi->fib_type == fi->fib_type &&
memcmp(nfi->fib_metrics, fi->fib_metrics,
sizeof(u32) * RTAX_MAX) == 0 &&
- ((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_F_DEAD) == 0 &&
+ !((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) &&
(nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0))
return fi;
}
@@ -604,6 +604,8 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
return -ENODEV;
if (!(dev->flags & IFF_UP))
return -ENETDOWN;
+ if (!netif_carrier_ok(dev))
+ nh->nh_flags |= RTNH_F_LINKDOWN;
nh->nh_dev = dev;
dev_hold(dev);
nh->nh_scope = RT_SCOPE_LINK;
@@ -621,7 +623,8 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
/* It is not necessary, but requires a bit of thinking */
if (fl4.flowi4_scope < RT_SCOPE_LINK)
fl4.flowi4_scope = RT_SCOPE_LINK;
- err = fib_lookup(net, &fl4, &res);
+ err = fib_lookup(net, &fl4, &res,
+ FIB_LOOKUP_IGNORE_LINKSTATE);
if (err) {
rcu_read_unlock();
return err;
@@ -636,6 +639,8 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
if (!dev)
goto out;
dev_hold(dev);
+ if (!netif_carrier_ok(dev))
+ nh->nh_flags |= RTNH_F_LINKDOWN;
err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN;
} else {
struct in_device *in_dev;
@@ -654,6 +659,8 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
nh->nh_dev = in_dev->dev;
dev_hold(nh->nh_dev);
nh->nh_scope = RT_SCOPE_HOST;
+ if (!netif_carrier_ok(nh->nh_dev))
+ nh->nh_flags |= RTNH_F_LINKDOWN;
err = 0;
}
out:
@@ -920,11 +927,17 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
if (!nh->nh_dev)
goto failure;
} else {
+ int linkdown = 0;
+
change_nexthops(fi) {
err = fib_check_nh(cfg, fi, nexthop_nh);
if (err != 0)
goto failure;
+ if (nexthop_nh->nh_flags & RTNH_F_LINKDOWN)
+ linkdown++;
} endfor_nexthops(fi)
+ if (linkdown == fi->fib_nhs)
+ fi->fib_flags |= RTNH_F_LINKDOWN;
}
if (fi->fib_prefsrc) {
@@ -1023,12 +1036,20 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
nla_put_in_addr(skb, RTA_PREFSRC, fi->fib_prefsrc))
goto nla_put_failure;
if (fi->fib_nhs == 1) {
+ struct in_device *in_dev;
+
if (fi->fib_nh->nh_gw &&
nla_put_in_addr(skb, RTA_GATEWAY, fi->fib_nh->nh_gw))
goto nla_put_failure;
if (fi->fib_nh->nh_oif &&
nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif))
goto nla_put_failure;
+ if (fi->fib_nh->nh_flags & RTNH_F_LINKDOWN) {
+ in_dev = __in_dev_get_rcu(fi->fib_nh->nh_dev);
+ if (in_dev &&
+ IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev))
+ rtm->rtm_flags |= RTNH_F_DEAD;
+ }
#ifdef CONFIG_IP_ROUTE_CLASSID
if (fi->fib_nh[0].nh_tclassid &&
nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid))
@@ -1045,11 +1066,19 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
goto nla_put_failure;
for_nexthops(fi) {
+ struct in_device *in_dev;
+
rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
if (!rtnh)
goto nla_put_failure;
rtnh->rtnh_flags = nh->nh_flags & 0xFF;
+ if (nh->nh_flags & RTNH_F_LINKDOWN) {
+ in_dev = __in_dev_get_rcu(nh->nh_dev);
+ if (in_dev &&
+ IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev))
+ rtnh->rtnh_flags |= RTNH_F_DEAD;
+ }
rtnh->rtnh_hops = nh->nh_weight - 1;
rtnh->rtnh_ifindex = nh->nh_oif;
@@ -1103,7 +1132,7 @@ int fib_sync_down_addr(struct net *net, __be32 local)
return ret;
}
-int fib_sync_down_dev(struct net_device *dev, int force)
+int fib_sync_down_dev(struct net_device *dev, unsigned long event)
{
int ret = 0;
int scope = RT_SCOPE_NOWHERE;
@@ -1112,7 +1141,8 @@ int fib_sync_down_dev(struct net_device *dev, int force)
struct hlist_head *head = &fib_info_devhash[hash];
struct fib_nh *nh;
- if (force)
+ if (event == NETDEV_UNREGISTER ||
+ event == NETDEV_DOWN)
scope = -1;
hlist_for_each_entry(nh, head, nh_hash) {
@@ -1129,7 +1159,15 @@ int fib_sync_down_dev(struct net_device *dev, int force)
dead++;
else if (nexthop_nh->nh_dev == dev &&
nexthop_nh->nh_scope != scope) {
- nexthop_nh->nh_flags |= RTNH_F_DEAD;
+ switch (event) {
+ case NETDEV_DOWN:
+ case NETDEV_UNREGISTER:
+ nexthop_nh->nh_flags |= RTNH_F_DEAD;
+ /* fall through */
+ case NETDEV_CHANGE:
+ nexthop_nh->nh_flags |= RTNH_F_LINKDOWN;
+ break;
+ }
#ifdef CONFIG_IP_ROUTE_MULTIPATH
spin_lock_bh(&fib_multipath_lock);
fi->fib_power -= nexthop_nh->nh_power;
@@ -1139,14 +1177,23 @@ int fib_sync_down_dev(struct net_device *dev, int force)
dead++;
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
- if (force > 1 && nexthop_nh->nh_dev == dev) {
+ if (event == NETDEV_UNREGISTER &&
+ nexthop_nh->nh_dev == dev) {
dead = fi->fib_nhs;
break;
}
#endif
} endfor_nexthops(fi)
if (dead == fi->fib_nhs) {
- fi->fib_flags |= RTNH_F_DEAD;
+ switch (event) {
+ case NETDEV_DOWN:
+ case NETDEV_UNREGISTER:
+ fi->fib_flags |= RTNH_F_DEAD;
+ /* fall through */
+ case NETDEV_CHANGE:
+ fi->fib_flags |= RTNH_F_LINKDOWN;
+ break;
+ }
ret++;
}
}
@@ -1210,13 +1257,11 @@ out:
return;
}
-#ifdef CONFIG_IP_ROUTE_MULTIPATH
-
/*
* Dead device goes up. We wake up dead nexthops.
* It takes sense only on multipath routes.
*/
-int fib_sync_up(struct net_device *dev)
+int fib_sync_up(struct net_device *dev, unsigned int nh_flags)
{
struct fib_info *prev_fi;
unsigned int hash;
@@ -1243,7 +1288,7 @@ int fib_sync_up(struct net_device *dev)
prev_fi = fi;
alive = 0;
change_nexthops(fi) {
- if (!(nexthop_nh->nh_flags & RTNH_F_DEAD)) {
+ if (!(nexthop_nh->nh_flags & nh_flags)) {
alive++;
continue;
}
@@ -1254,14 +1299,18 @@ int fib_sync_up(struct net_device *dev)
!__in_dev_get_rtnl(dev))
continue;
alive++;
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
spin_lock_bh(&fib_multipath_lock);
nexthop_nh->nh_power = 0;
- nexthop_nh->nh_flags &= ~RTNH_F_DEAD;
+ nexthop_nh->nh_flags &= ~nh_flags;
spin_unlock_bh(&fib_multipath_lock);
+#else
+ nexthop_nh->nh_flags &= ~nh_flags;
+#endif
} endfor_nexthops(fi)
if (alive > 0) {
- fi->fib_flags &= ~RTNH_F_DEAD;
+ fi->fib_flags &= ~nh_flags;
ret++;
}
}
@@ -1269,6 +1318,8 @@ int fib_sync_up(struct net_device *dev)
return ret;
}
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
+
/*
* The algorithm is suboptimal, but it provides really
* fair weighted route distribution.
@@ -1276,16 +1327,22 @@ int fib_sync_up(struct net_device *dev)
void fib_select_multipath(struct fib_result *res)
{
struct fib_info *fi = res->fi;
+ struct in_device *in_dev;
int w;
spin_lock_bh(&fib_multipath_lock);
if (fi->fib_power <= 0) {
int power = 0;
change_nexthops(fi) {
- if (!(nexthop_nh->nh_flags & RTNH_F_DEAD)) {
- power += nexthop_nh->nh_weight;
- nexthop_nh->nh_power = nexthop_nh->nh_weight;
- }
+ in_dev = __in_dev_get_rcu(nexthop_nh->nh_dev);
+ if (nexthop_nh->nh_flags & RTNH_F_DEAD)
+ continue;
+ if (in_dev &&
+ IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) &&
+ nexthop_nh->nh_flags & RTNH_F_LINKDOWN)
+ continue;
+ power += nexthop_nh->nh_weight;
+ nexthop_nh->nh_power = nexthop_nh->nh_weight;
} endfor_nexthops(fi);
fi->fib_power = power;
if (power <= 0) {
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 6c666a9f1bd5..15d32612e3c6 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1412,9 +1412,15 @@ found:
continue;
for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
const struct fib_nh *nh = &fi->fib_nh[nhsel];
+ struct in_device *in_dev = __in_dev_get_rcu(nh->nh_dev);
if (nh->nh_flags & RTNH_F_DEAD)
continue;
+ if (in_dev &&
+ IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) &&
+ nh->nh_flags & RTNH_F_LINKDOWN &&
+ !(fib_flags & FIB_LOOKUP_IGNORE_LINKSTATE))
+ continue;
if (flp->flowi4_oif && flp->flowi4_oif != nh->nh_oif)
continue;
diff --git a/net/ipv4/netfilter/ipt_rpfilter.c b/net/ipv4/netfilter/ipt_rpfilter.c
index 4bfaedf9b34e..8618fd150c96 100644
--- a/net/ipv4/netfilter/ipt_rpfilter.c
+++ b/net/ipv4/netfilter/ipt_rpfilter.c
@@ -40,7 +40,7 @@ static bool rpfilter_lookup_reverse(struct flowi4 *fl4,
struct net *net = dev_net(dev);
int ret __maybe_unused;
- if (fib_lookup(net, fl4, &res))
+ if (fib_lookup(net, fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE))
return false;
if (res.type != RTN_UNICAST) {
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index f6055984c307..d0362a2de3d3 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -747,7 +747,7 @@ static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flow
if (!(n->nud_state & NUD_VALID)) {
neigh_event_send(n, NULL);
} else {
- if (fib_lookup(net, fl4, &res) == 0) {
+ if (fib_lookup(net, fl4, &res, 0) == 0) {
struct fib_nh *nh = &FIB_RES_NH(res);
update_or_create_fnhe(nh, fl4->daddr, new_gw,
@@ -975,7 +975,7 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
return;
rcu_read_lock();
- if (fib_lookup(dev_net(dst->dev), fl4, &res) == 0) {
+ if (fib_lookup(dev_net(dst->dev), fl4, &res, 0) == 0) {
struct fib_nh *nh = &FIB_RES_NH(res);
update_or_create_fnhe(nh, fl4->daddr, 0, mtu,
@@ -1186,7 +1186,7 @@ void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt)
fl4.flowi4_mark = skb->mark;
rcu_read_lock();
- if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res) == 0)
+ if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res, 0) == 0)
src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res);
else
src = inet_select_addr(rt->dst.dev,
@@ -1716,7 +1716,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
fl4.daddr = daddr;
fl4.saddr = saddr;
- err = fib_lookup(net, &fl4, &res);
+ err = fib_lookup(net, &fl4, &res, 0);
if (err != 0) {
if (!IN_DEV_FORWARD(in_dev))
err = -EHOSTUNREACH;
@@ -2123,7 +2123,7 @@ struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *fl4)
goto make_route;
}
- if (fib_lookup(net, fl4, &res)) {
+ if (fib_lookup(net, fl4, &res, 0)) {
res.fi = NULL;
res.table = NULL;
if (fl4->flowi4_oif) {
generated by cgit v1.2.3 (git 2.39.0) at 2025-03-01 15:48:59 +0300