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authorTimo Teras <timo.teras@iki.fi>2009-01-19 17:22:12 -0800
committerDavid S. Miller <davem@davemloft.net>2009-01-21 14:34:54 -0800
commit749c10f931923451a4c59b4435d182aa9ae27a4f (patch)
tree1c715c26a58ccdf144f8ff5cd64d7ff5ab1bf36b
parent57a574993d94671b495cdbe8aeb78b745abfe14f (diff)
gre: strict physical device binding
Check the device on receive path and allow otherwise identical devices as long as the physical device differs. This is useful for NBMA tunnels, where you want to use different gre IP for each public IP available via different physical devices. Signed-off-by: Timo Teras <timo.teras@iki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/ip_gre.c128
1 files changed, 88 insertions, 40 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 0101521f366..4a43739c903 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -164,67 +164,113 @@ static DEFINE_RWLOCK(ipgre_lock);
/* Given src, dst and key, find appropriate for input tunnel. */
-static struct ip_tunnel * ipgre_tunnel_lookup(struct net *net,
+static struct ip_tunnel * ipgre_tunnel_lookup(struct net_device *dev,
__be32 remote, __be32 local,
__be32 key, __be16 gre_proto)
{
+ struct net *net = dev_net(dev);
+ int link = dev->ifindex;
unsigned h0 = HASH(remote);
unsigned h1 = HASH(key);
- struct ip_tunnel *t;
- struct ip_tunnel *t2 = NULL;
+ struct ip_tunnel *t, *sel[4] = { NULL, NULL, NULL, NULL };
struct ipgre_net *ign = net_generic(net, ipgre_net_id);
int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
ARPHRD_ETHER : ARPHRD_IPGRE;
+ int idx;
for (t = ign->tunnels_r_l[h0^h1]; t; t = t->next) {
- if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) {
- if (t->parms.i_key == key && t->dev->flags & IFF_UP) {
- if (t->dev->type == dev_type)
- return t;
- if (t->dev->type == ARPHRD_IPGRE && !t2)
- t2 = t;
- }
- }
+ if (local != t->parms.iph.saddr ||
+ remote != t->parms.iph.daddr ||
+ key != t->parms.i_key ||
+ !(t->dev->flags & IFF_UP))
+ continue;
+
+ if (t->dev->type != ARPHRD_IPGRE &&
+ t->dev->type != dev_type)
+ continue;
+
+ idx = 0;
+ if (t->parms.link != link)
+ idx |= 1;
+ if (t->dev->type != dev_type)
+ idx |= 2;
+ if (idx == 0)
+ return t;
+ if (sel[idx] == NULL)
+ sel[idx] = t;
}
for (t = ign->tunnels_r[h0^h1]; t; t = t->next) {
- if (remote == t->parms.iph.daddr) {
- if (t->parms.i_key == key && t->dev->flags & IFF_UP) {
- if (t->dev->type == dev_type)
- return t;
- if (t->dev->type == ARPHRD_IPGRE && !t2)
- t2 = t;
- }
- }
+ if (remote != t->parms.iph.daddr ||
+ key != t->parms.i_key ||
+ !(t->dev->flags & IFF_UP))
+ continue;
+
+ if (t->dev->type != ARPHRD_IPGRE &&
+ t->dev->type != dev_type)
+ continue;
+
+ idx = 0;
+ if (t->parms.link != link)
+ idx |= 1;
+ if (t->dev->type != dev_type)
+ idx |= 2;
+ if (idx == 0)
+ return t;
+ if (sel[idx] == NULL)
+ sel[idx] = t;
}
for (t = ign->tunnels_l[h1]; t; t = t->next) {
- if (local == t->parms.iph.saddr ||
- (local == t->parms.iph.daddr &&
- ipv4_is_multicast(local))) {
- if (t->parms.i_key == key && t->dev->flags & IFF_UP) {
- if (t->dev->type == dev_type)
- return t;
- if (t->dev->type == ARPHRD_IPGRE && !t2)
- t2 = t;
- }
- }
+ if ((local != t->parms.iph.saddr &&
+ (local != t->parms.iph.daddr ||
+ !ipv4_is_multicast(local))) ||
+ key != t->parms.i_key ||
+ !(t->dev->flags & IFF_UP))
+ continue;
+
+ if (t->dev->type != ARPHRD_IPGRE &&
+ t->dev->type != dev_type)
+ continue;
+
+ idx = 0;
+ if (t->parms.link != link)
+ idx |= 1;
+ if (t->dev->type != dev_type)
+ idx |= 2;
+ if (idx == 0)
+ return t;
+ if (sel[idx] == NULL)
+ sel[idx] = t;
}
for (t = ign->tunnels_wc[h1]; t; t = t->next) {
- if (t->parms.i_key == key && t->dev->flags & IFF_UP) {
- if (t->dev->type == dev_type)
- return t;
- if (t->dev->type == ARPHRD_IPGRE && !t2)
- t2 = t;
- }
+ if (t->parms.i_key != key ||
+ !(t->dev->flags & IFF_UP))
+ continue;
+
+ if (t->dev->type != ARPHRD_IPGRE &&
+ t->dev->type != dev_type)
+ continue;
+
+ idx = 0;
+ if (t->parms.link != link)
+ idx |= 1;
+ if (t->dev->type != dev_type)
+ idx |= 2;
+ if (idx == 0)
+ return t;
+ if (sel[idx] == NULL)
+ sel[idx] = t;
}
- if (t2)
- return t2;
+ for (idx = 1; idx < ARRAY_SIZE(sel); idx++)
+ if (sel[idx] != NULL)
+ return sel[idx];
- if (ign->fb_tunnel_dev->flags&IFF_UP)
+ if (ign->fb_tunnel_dev->flags & IFF_UP)
return netdev_priv(ign->fb_tunnel_dev);
+
return NULL;
}
@@ -284,6 +330,7 @@ static struct ip_tunnel *ipgre_tunnel_find(struct net *net,
__be32 remote = parms->iph.daddr;
__be32 local = parms->iph.saddr;
__be32 key = parms->i_key;
+ int link = parms->link;
struct ip_tunnel *t, **tp;
struct ipgre_net *ign = net_generic(net, ipgre_net_id);
@@ -291,6 +338,7 @@ static struct ip_tunnel *ipgre_tunnel_find(struct net *net,
if (local == t->parms.iph.saddr &&
remote == t->parms.iph.daddr &&
key == t->parms.i_key &&
+ link == t->parms.link &&
type == t->dev->type)
break;
@@ -421,7 +469,7 @@ static void ipgre_err(struct sk_buff *skb, u32 info)
}
read_lock(&ipgre_lock);
- t = ipgre_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr,
+ t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr,
flags & GRE_KEY ?
*(((__be32 *)p) + (grehlen / 4) - 1) : 0,
p[1]);
@@ -518,7 +566,7 @@ static int ipgre_rcv(struct sk_buff *skb)
gre_proto = *(__be16 *)(h + 2);
read_lock(&ipgre_lock);
- if ((tunnel = ipgre_tunnel_lookup(dev_net(skb->dev),
+ if ((tunnel = ipgre_tunnel_lookup(skb->dev,
iph->saddr, iph->daddr, key,
gre_proto))) {
struct net_device_stats *stats = &tunnel->dev->stats;