11 files changed, 330 insertions, 75 deletions

diff --git a/include/linux/if_tunnel.h b/include/linux/if_tunnel.h
index 228eb4eb3129..f1fbe9c930d7 100644
--- a/include/linux/if_tunnel.h
+++ b/include/linux/if_tunnel.h
@@ -7,6 +7,10 @@
 #define SIOCADDTUNNEL   (SIOCDEVPRIVATE + 1)
 #define SIOCDELTUNNEL   (SIOCDEVPRIVATE + 2)
 #define SIOCCHGTUNNEL   (SIOCDEVPRIVATE + 3)
+#define SIOCGETPRL      (SIOCDEVPRIVATE + 4)
+#define SIOCADDPRL      (SIOCDEVPRIVATE + 5)
+#define SIOCDELPRL      (SIOCDEVPRIVATE + 6)
+#define SIOCCHGPRL      (SIOCDEVPRIVATE + 7)
 
 #define GRE_CSUM        __constant_htons(0x8000)
 #define GRE_ROUTING     __constant_htons(0x4000)
@@ -17,9 +21,6 @@
 #define GRE_FLAGS       __constant_htons(0x00F8)
 #define GRE_VERSION     __constant_htons(0x0007)
 
-/* i_flags values for SIT mode */
-#define SIT_ISATAP      0x0001
-
 struct ip_tunnel_parm
 {
         char                    name[IFNAMSIZ];
@@ -31,4 +32,19 @@ struct ip_tunnel_parm
         struct iphdr            iph;
 };
 
+/* SIT-mode i_flags */
+#define SIT_ISATAP      0x0001
+
+struct ip_tunnel_prl {
+        __be32                  addr;
+        __u16                   flags;
+        __u16                   __reserved;
+        __u32                   datalen;
+        __u32                   __reserved2;
+        void __user             *data;
+};
+
+/* PRL flags */
+#define PRL_DEFAULT             0x0001
+
 #endif /* _IF_TUNNEL_H_ */
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index ff72145d5d9e..e517701c25ba 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -313,7 +313,10 @@ struct sk_buff {
         __u16                   tc_verd;        /* traffic control verdict */
 #endif
 #endif
-        /* 2 byte hole */
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+        __u8                    ndisc_nodetype:2;
+#endif
+        /* 14 bit hole */
 
 #ifdef CONFIG_NET_DMA
         dma_cookie_t            dma_cookie;
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index d89b0bc7ab75..bdcc863a60a4 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -71,6 +71,10 @@ extern int			ipv6_chk_addr(struct net *net,
 extern int                      ipv6_chk_home_addr(struct net *net,
                                                    struct in6_addr *addr);
 #endif
+
+extern int                      ipv6_chk_prefix(struct in6_addr *addr,
+                                                struct net_device *dev);
+
 extern struct inet6_ifaddr      *ipv6_get_ifaddr(struct net *net,
                                                  struct in6_addr *addr,
                                                  struct net_device *dev,
diff --git a/include/net/ipip.h b/include/net/ipip.h
index 549e132bca9c..633ed4def8e3 100644
--- a/include/net/ipip.h
+++ b/include/net/ipip.h
@@ -24,6 +24,16 @@ struct ip_tunnel
         int                     mlink;
 
         struct ip_tunnel_parm   parms;
+
+        struct ip_tunnel_prl_entry      *prl;           /* potential router list */
+        unsigned int                    prl_count;      /* # of entries in PRL */
+};
+
+struct ip_tunnel_prl_entry
+{
+        struct ip_tunnel_prl_entry      *next;
+        __be32                          addr;
+        u16                             flags;
 };
 
 #define IPTUNNEL_XMIT() do {                                            \
diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index 5aedf324de66..9f2bae68d28c 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -12,6 +12,15 @@
 #define NDISC_REDIRECT                  137
 
 /*
+ * Router type: cross-layer information from link-layer to
+ * IPv6 layer reported by certain link types (e.g., RFC4214).
+ */
+#define NDISC_NODETYPE_UNSPEC           0       /* unspecified (default) */
+#define NDISC_NODETYPE_HOST             1       /* host or unauthorized router */
+#define NDISC_NODETYPE_NODEFAULT        2       /* non-default router */
+#define NDISC_NODETYPE_DEFAULT          3       /* default router */
+
+/*
  *      ndisc options
  */
 
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index 82f987b4ef84..6cd2f4cdcb28 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -168,6 +168,7 @@ config IPV6_SIT
         tristate "IPv6: IPv6-in-IPv4 tunnel (SIT driver)"
         depends on IPV6
         select INET_TUNNEL
+        select IPV6_NDISC_NODETYPE
         default y
         ---help---
           Tunneling means encapsulating data of one protocol type within
@@ -178,6 +179,9 @@ config IPV6_SIT
 
           Saying M here will produce a module called sit.ko. If unsure, say Y.
 
+config IPV6_NDISC_NODETYPE
+        bool
+
 config IPV6_TUNNEL
         tristate "IPv6: IP-in-IPv6 tunnel (RFC2473)"
         select INET6_TUNNEL
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index dbc51af69017..924158393d04 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1265,6 +1265,31 @@ int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
         return ifp != NULL;
 }
 
+int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
+{
+        struct inet6_dev *idev;
+        struct inet6_ifaddr *ifa;
+        int     onlink;
+
+        onlink = 0;
+        rcu_read_lock();
+        idev = __in6_dev_get(dev);
+        if (idev) {
+                read_lock_bh(&idev->lock);
+                for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
+                        onlink = ipv6_prefix_equal(addr, &ifa->addr,
+                                                   ifa->prefix_len);
+                        if (onlink)
+                                break;
+                }
+                read_unlock_bh(&idev->lock);
+        }
+        rcu_read_unlock();
+        return onlink;
+}
+
+EXPORT_SYMBOL(ipv6_chk_prefix);
+
 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
                                      struct net_device *dev, int strict)
 {
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index 463bd95d6b13..36e817492095 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -48,29 +48,6 @@ static int ipv6_dev_ac_dec(struct net_device *dev, struct in6_addr *addr);
 /* Big ac list lock for all the sockets */
 static DEFINE_RWLOCK(ipv6_sk_ac_lock);
 
-static int
-ip6_onlink(struct in6_addr *addr, struct net_device *dev)
-{
-        struct inet6_dev        *idev;
-        struct inet6_ifaddr     *ifa;
-        int     onlink;
-
-        onlink = 0;
-        rcu_read_lock();
-        idev = __in6_dev_get(dev);
-        if (idev) {
-                read_lock_bh(&idev->lock);
-                for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
-                        onlink = ipv6_prefix_equal(addr, &ifa->addr,
-                                                   ifa->prefix_len);
-                        if (onlink)
-                                break;
-                }
-                read_unlock_bh(&idev->lock);
-        }
-        rcu_read_unlock();
-        return onlink;
-}
 
 /*
  *      socket join an anycast group
@@ -142,7 +119,7 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, struct in6_addr *addr)
          * This obviates the need for propagating anycast routes while
          * still allowing some non-router anycast participation.
          */
-        if (!ip6_onlink(addr, dev)) {
+        if (!ipv6_chk_prefix(addr, dev)) {
                 if (ishost)
                         err = -EADDRNOTAVAIL;
                 if (err)
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 06d80c6dc5ce..b3295d82fece 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1093,6 +1093,14 @@ static void ndisc_router_discovery(struct sk_buff *skb)
                 return;
         }
 
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+        if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
+                ND_PRINTK2(KERN_WARNING
+                           "ICMPv6 RA: from host or unauthorized router\n");
+                return;
+        }
+#endif
+
         /*
          *      set the RA_RECV flag in the interface
          */
@@ -1116,6 +1124,12 @@ static void ndisc_router_discovery(struct sk_buff *skb)
                 return;
         }
 
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+        /* skip link-specific parameters from interior routers */
+        if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
+                goto skip_linkparms;
+#endif
+
         if (in6_dev->if_flags & IF_RS_SENT) {
                 /*
                  *      flag that an RA was received after an RS was sent
@@ -1230,6 +1244,10 @@ skip_defrtr:
                 }
         }
 
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+skip_linkparms:
+#endif
+
         /*
          *      Process options.
          */
@@ -1261,7 +1279,13 @@ skip_defrtr:
                 for (p = ndopts.nd_opts_ri;
                      p;
                      p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
-                        if (((struct route_info *)p)->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
+                        struct route_info *ri = (struct route_info *)p;
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+                        if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
+                            ri->prefix_len == 0)
+                                continue;
+#endif
+                        if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
                                 continue;
                         rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
                                       &ipv6_hdr(skb)->saddr);
@@ -1269,6 +1293,12 @@ skip_defrtr:
         }
 #endif
 
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+        /* skip link-specific ndopts from interior routers */
+        if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
+                goto out;
+#endif
+
         if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
                 struct nd_opt_hdr *p;
                 for (p = ndopts.nd_opts_pi;
@@ -1332,6 +1362,16 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
         int optlen;
         u8 *lladdr = NULL;
 
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+        switch (skb->ndisc_nodetype) {
+        case NDISC_NODETYPE_HOST:
+        case NDISC_NODETYPE_NODEFAULT:
+                ND_PRINTK2(KERN_WARNING
+                           "ICMPv6 Redirect: from host or unauthorized router\n");
+                return;
+        }
+#endif
+
         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
                 ND_PRINTK2(KERN_WARNING
                            "ICMPv6 Redirect: source address is not link-local.\n");
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 3c314d5f46c6..269b76093288 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1700,8 +1700,6 @@ struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *d
         return rt;
 }
 
-EXPORT_SYMBOL(rt6_get_dflt_router);
-
 struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
                                      struct net_device *dev,
                                      unsigned int pref)
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 1b8196c8d145..cc16fe07bbff 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;
         }