Merge branch 'net-2.6.26-isatap-20080403' of git://git.linux-ipv6.org/gitroot/yoshfuji/linux-2.6-dev

1 files changed, 213 insertions, 44 deletions

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 1b8196c8d14..cc16fe07bbf 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -16,7 +16,7 @@
  *	Changes:
  * Roger Venning <r.venning@telstra.com>:	6to4 support
  * Nate Thompson <nate@thebog.net>:		6to4 support
- * Fred L. Templin <fltemplin@acm.org>:		isatap support
+ * Fred Templin <fred.l.templin@boeing.com>:	isatap support
  */
 
 #include <linux/module.h>
@@ -197,6 +197,179 @@ failed:
 	return NULL;
 }
 
+static struct ip_tunnel_prl_entry *
+__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
+{
+	struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL;
+
+	for (p = t->prl; p; p = p->next)
+		if (p->addr == addr)
+			break;
+	return p;
+
+}
+
+static int ipip6_tunnel_get_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
+{
+	struct ip_tunnel_prl *kp;
+	struct ip_tunnel_prl_entry *prl;
+	unsigned int cmax, c = 0, ca, len;
+	int ret = 0;
+
+	cmax = a->datalen / sizeof(*a);
+	if (cmax > 1 && a->addr != htonl(INADDR_ANY))
+		cmax = 1;
+
+	/* For simple GET or for root users,
+	 * we try harder to allocate.
+	 */
+	kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
+		kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
+		NULL;
+
+	read_lock(&ipip6_lock);
+
+	ca = t->prl_count < cmax ? t->prl_count : cmax;
+
+	if (!kp) {
+		/* We don't try hard to allocate much memory for
+		 * non-root users.
+		 * For root users, retry allocating enough memory for
+		 * the answer.
+		 */
+		kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
+		if (!kp) {
+			ret = -ENOMEM;
+			goto out;
+		}
+	}
+
+	c = 0;
+	for (prl = t->prl; prl; prl = prl->next) {
+		if (c > cmax)
+			break;
+		if (a->addr != htonl(INADDR_ANY) && prl->addr != a->addr)
+			continue;
+		kp[c].addr = prl->addr;
+		kp[c].flags = prl->flags;
+		c++;
+		if (a->addr != htonl(INADDR_ANY))
+			break;
+	}
+out:
+	read_unlock(&ipip6_lock);
+
+	len = sizeof(*kp) * c;
+	ret = len ? copy_to_user(a->data, kp, len) : 0;
+
+	kfree(kp);
+	if (ret)
+		return -EFAULT;
+
+	a->datalen = len;
+	return 0;
+}
+
+static int
+ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
+{
+	struct ip_tunnel_prl_entry *p;
+	int err = 0;
+
+	if (a->addr == htonl(INADDR_ANY))
+		return -EINVAL;
+
+	write_lock(&ipip6_lock);
+
+	for (p = t->prl; p; p = p->next) {
+		if (p->addr == a->addr) {
+			if (chg)
+				goto update;
+			err = -EEXIST;
+			goto out;
+		}
+	}
+
+	if (chg) {
+		err = -ENXIO;
+		goto out;
+	}
+
+	p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
+	if (!p) {
+		err = -ENOBUFS;
+		goto out;
+	}
+
+	p->next = t->prl;
+	t->prl = p;
+	t->prl_count++;
+update:
+	p->addr = a->addr;
+	p->flags = a->flags;
+out:
+	write_unlock(&ipip6_lock);
+	return err;
+}
+
+static int
+ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
+{
+	struct ip_tunnel_prl_entry *x, **p;
+	int err = 0;
+
+	write_lock(&ipip6_lock);
+
+	if (a && a->addr != htonl(INADDR_ANY)) {
+		for (p = &t->prl; *p; p = &(*p)->next) {
+			if ((*p)->addr == a->addr) {
+				x = *p;
+				*p = x->next;
+				kfree(x);
+				t->prl_count--;
+				goto out;
+			}
+		}
+		err = -ENXIO;
+	} else {
+		while (t->prl) {
+			x = t->prl;
+			t->prl = t->prl->next;
+			kfree(x);
+			t->prl_count--;
+		}
+	}
+out:
+	write_unlock(&ipip6_lock);
+	return 0;
+}
+
+static int
+isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
+{
+	struct ip_tunnel_prl_entry *p;
+	int ok = 1;
+
+	read_lock(&ipip6_lock);
+	p = __ipip6_tunnel_locate_prl(t, iph->saddr);
+	if (p) {
+		if (p->flags & PRL_DEFAULT)
+			skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
+		else
+			skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
+	} else {
+		struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
+		if (ipv6_addr_is_isatap(addr6) &&
+		    (addr6->s6_addr32[3] == iph->saddr) &&
+		    ipv6_chk_prefix(addr6, t->dev))
+			skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
+		else
+			ok = 0;
+	}
+	read_unlock(&ipip6_lock);
+	return ok;
+}
+
 static void ipip6_tunnel_uninit(struct net_device *dev)
 {
 	if (dev == ipip6_fb_tunnel_dev) {
@@ -206,6 +379,7 @@ static void ipip6_tunnel_uninit(struct net_device *dev)
 		dev_put(dev);
 	} else {
 		ipip6_tunnel_unlink(netdev_priv(dev));
+		ipip6_tunnel_del_prl(netdev_priv(dev), 0);
 		dev_put(dev);
 	}
 }
@@ -365,48 +539,6 @@ static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
 		IP6_ECN_set_ce(ipv6_hdr(skb));
 }
 
-/* ISATAP (RFC4214) - check source address */
-static int
-isatap_srcok(struct sk_buff *skb, struct iphdr *iph, struct net_device *dev)
-{
-	struct neighbour *neigh;
-	struct dst_entry *dst;
-	struct rt6_info *rt;
-	struct flowi fl;
-	struct in6_addr *addr6;
-	struct in6_addr rtr;
-	struct ipv6hdr *iph6;
-	int ok = 0;
-
-	/* from onlink default router */
-	ipv6_addr_set(&rtr,  htonl(0xFE800000), 0, 0, 0);
-	ipv6_isatap_eui64(rtr.s6_addr + 8, iph->saddr);
-	if ((rt = rt6_get_dflt_router(&rtr, dev))) {
-		dst_release(&rt->u.dst);
-		return 1;
-	}
-
-	iph6 = ipv6_hdr(skb);
-	memset(&fl, 0, sizeof(fl));
-	fl.proto = iph6->nexthdr;
-	ipv6_addr_copy(&fl.fl6_dst, &iph6->saddr);
-	fl.oif = dev->ifindex;
-	security_skb_classify_flow(skb, &fl);
-
-	dst = ip6_route_output(&init_net, NULL, &fl);
-	if (!dst->error && (dst->dev == dev) && (neigh = dst->neighbour)) {
-
-		addr6 = (struct in6_addr*)&neigh->primary_key;
-
-		/* from correct previous hop */
-		if (ipv6_addr_is_isatap(addr6) &&
-		    (addr6->s6_addr32[3] == iph->saddr))
-			ok = 1;
-	}
-	dst_release(dst);
-	return ok;
-}
-
 static int ipip6_rcv(struct sk_buff *skb)
 {
 	struct iphdr *iph;
@@ -427,7 +559,7 @@ static int ipip6_rcv(struct sk_buff *skb)
 		skb->pkt_type = PACKET_HOST;
 
 		if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
-		    !isatap_srcok(skb, iph, tunnel->dev)) {
+		    !isatap_chksrc(skb, iph, tunnel)) {
 			tunnel->stat.rx_errors++;
 			read_unlock(&ipip6_lock);
 			kfree_skb(skb);
@@ -707,6 +839,7 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 {
 	int err = 0;
 	struct ip_tunnel_parm p;
+	struct ip_tunnel_prl prl;
 	struct ip_tunnel *t;
 
 	switch (cmd) {
@@ -806,6 +939,42 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 		err = 0;
 		break;
 
+	case SIOCGETPRL:
+	case SIOCADDPRL:
+	case SIOCDELPRL:
+	case SIOCCHGPRL:
+		err = -EPERM;
+		if (cmd != SIOCGETPRL && !capable(CAP_NET_ADMIN))
+			goto done;
+		err = -EINVAL;
+		if (dev == ipip6_fb_tunnel_dev)
+			goto done;
+		err = -EFAULT;
+		if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
+			goto done;
+		err = -ENOENT;
+		if (!(t = netdev_priv(dev)))
+			goto done;
+
+		switch (cmd) {
+		case SIOCGETPRL:
+			err = ipip6_tunnel_get_prl(t, &prl);
+			if (!err && copy_to_user(ifr->ifr_ifru.ifru_data,
+						 &prl, sizeof(prl)))
+				err = -EFAULT;
+			break;
+		case SIOCDELPRL:
+			err = ipip6_tunnel_del_prl(t, &prl);
+			break;
+		case SIOCADDPRL:
+		case SIOCCHGPRL:
+			err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
+			break;
+		}
+		if (cmd != SIOCGETPRL)
+			netdev_state_change(dev);
+		break;
+
 	default:
 		err = -EINVAL;
 	}