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authorVille Nuorvala <vnuorval@tcs.hut.fi>2006-11-24 17:06:27 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-02 21:30:24 -0800
commit09c6bbf090ecb52c8d670fa4d5730be134a8ec8b (patch)
tree3ae488ac005b0847aeab4a03c4fdd38607c38d71
parent567131a722ca064c917c0b06e4bcf07d47602103 (diff)
[IPV6]: Do mandatory IPv6 tunnel endpoint checks in realtime
Doing the mandatory tunnel endpoint checks when the tunnel is set up isn't enough as interfaces can go up or down and addresses can be added or deleted after this. The checks need to be done realtime when the tunnel is processing a packet. Signed-off-by: Ville Nuorvala <vnuorval@tcs.hut.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv6/ip6_tunnel.c96
1 files changed, 62 insertions, 34 deletions
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index fdf1a2fa3a3..22debbf28b8 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -494,6 +494,27 @@ static inline void ip6ip6_ecn_decapsulate(struct ipv6hdr *outer_iph,
if (INET_ECN_is_ce(ipv6_get_dsfield(outer_iph)))
IP6_ECN_set_ce(inner_iph);
}
+static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
+{
+ struct ip6_tnl_parm *p = &t->parms;
+ int ret = 0;
+
+ if (p->flags & IP6_TNL_F_CAP_RCV) {
+ struct net_device *ldev = NULL;
+
+ if (p->link)
+ ldev = dev_get_by_index(p->link);
+
+ if ((ipv6_addr_is_multicast(&p->laddr) ||
+ likely(ipv6_chk_addr(&p->laddr, ldev, 0))) &&
+ likely(!ipv6_chk_addr(&p->raddr, NULL, 0)))
+ ret = 1;
+
+ if (ldev)
+ dev_put(ldev);
+ }
+ return ret;
+}
/**
* ip6ip6_rcv - decapsulate IPv6 packet and retransmit it locally
@@ -518,7 +539,7 @@ ip6ip6_rcv(struct sk_buff *skb)
goto discard;
}
- if (!(t->parms.flags & IP6_TNL_F_CAP_RCV)) {
+ if (!ip6_tnl_rcv_ctl(t)) {
t->stat.rx_dropped++;
read_unlock(&ip6ip6_lock);
goto discard;
@@ -597,6 +618,34 @@ ip6ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr)
return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
}
+static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
+{
+ struct ip6_tnl_parm *p = &t->parms;
+ int ret = 0;
+
+ if (p->flags & IP6_TNL_F_CAP_XMIT) {
+ struct net_device *ldev = NULL;
+
+ if (p->link)
+ ldev = dev_get_by_index(p->link);
+
+ if (unlikely(!ipv6_chk_addr(&p->laddr, ldev, 0)))
+ printk(KERN_WARNING
+ "%s xmit: Local address not yet configured!\n",
+ p->name);
+ else if (!ipv6_addr_is_multicast(&p->raddr) &&
+ unlikely(ipv6_chk_addr(&p->raddr, NULL, 0)))
+ printk(KERN_WARNING
+ "%s xmit: Routing loop! "
+ "Remote address found on this node!\n",
+ p->name);
+ else
+ ret = 1;
+ if (ldev)
+ dev_put(ldev);
+ }
+ return ret;
+}
/**
* ip6ip6_tnl_xmit - encapsulate packet and send
* @skb: the outgoing socket buffer
@@ -634,10 +683,9 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
goto tx_err;
}
if (skb->protocol != htons(ETH_P_IPV6) ||
- !(t->parms.flags & IP6_TNL_F_CAP_XMIT) ||
- ip6ip6_tnl_addr_conflict(t, ipv6h)) {
+ !ip6_tnl_xmit_ctl(t) || ip6ip6_tnl_addr_conflict(t, ipv6h))
goto tx_err;
- }
+
if ((offset = parse_tlv_tnl_enc_lim(skb, skb->nh.raw)) > 0) {
struct ipv6_tlv_tnl_enc_lim *tel;
tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->nh.raw[offset];
@@ -768,39 +816,19 @@ tx_err:
static void ip6_tnl_set_cap(struct ip6_tnl *t)
{
struct ip6_tnl_parm *p = &t->parms;
- struct in6_addr *laddr = &p->laddr;
- struct in6_addr *raddr = &p->raddr;
- int ltype = ipv6_addr_type(laddr);
- int rtype = ipv6_addr_type(raddr);
+ int ltype = ipv6_addr_type(&p->laddr);
+ int rtype = ipv6_addr_type(&p->raddr);
p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV);
- if (ltype != IPV6_ADDR_ANY && rtype != IPV6_ADDR_ANY &&
- ((ltype|rtype) &
- (IPV6_ADDR_UNICAST|
- IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL|
- IPV6_ADDR_MAPPED|IPV6_ADDR_RESERVED)) == IPV6_ADDR_UNICAST) {
- struct net_device *ldev = NULL;
- int l_ok = 1;
- int r_ok = 1;
-
- if (p->link)
- ldev = dev_get_by_index(p->link);
-
- if (ltype&IPV6_ADDR_UNICAST && !ipv6_chk_addr(laddr, ldev, 0))
- l_ok = 0;
-
- if (rtype&IPV6_ADDR_UNICAST && ipv6_chk_addr(raddr, NULL, 0))
- r_ok = 0;
-
- if (l_ok && r_ok) {
- if (ltype&IPV6_ADDR_UNICAST)
- p->flags |= IP6_TNL_F_CAP_XMIT;
- if (rtype&IPV6_ADDR_UNICAST)
- p->flags |= IP6_TNL_F_CAP_RCV;
- }
- if (ldev)
- dev_put(ldev);
+ if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
+ rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
+ !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
+ !((ltype|rtype) & IPV6_ADDR_LINKLOCAL)) {
+ if (ltype&IPV6_ADDR_UNICAST)
+ p->flags |= IP6_TNL_F_CAP_XMIT;
+ if (rtype&IPV6_ADDR_UNICAST)
+ p->flags |= IP6_TNL_F_CAP_RCV;
}
}