mpls: Enforce payload type of traffic sent using explicit NULL

RFC 4182 s2 states that if an IPv4 Explicit NULL label is the only
label on the stack, then after popping the resulting packet must be
treated as a IPv4 packet and forwarded based on the IPv4 header. The
same is true for IPv6 Explicit NULL with an IPv6 packet following.

Therefore, when installing the IPv4/IPv6 Explicit NULL label routes,
add an attribute that specifies the expected payload type for use at
forwarding time for determining the type of the encapsulated packet
instead of inspecting the first nibble of the packet.

Signed-off-by: Robert Shearman <rshearma@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 44 insertions, 27 deletions

diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 04306989d054..8c5707db53c5 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -27,11 +27,23 @@
 /* This maximum ha length copied from the definition of struct neighbour */
 #define MAX_VIA_ALEN (ALIGN(MAX_ADDR_LEN, sizeof(unsigned long)))
 
+enum mpls_payload_type {
+        MPT_UNSPEC, /* IPv4 or IPv6 */
+        MPT_IPV4 = 4,
+        MPT_IPV6 = 6,
+
+        /* Other types not implemented:
+         *  - Pseudo-wire with or without control word (RFC4385)
+         *  - GAL (RFC5586)
+         */
+};
+
 struct mpls_route { /* next hop label forwarding entry */
         struct net_device __rcu *rt_dev;
         struct rcu_head         rt_rcu;
         u32                     rt_label[MAX_NEW_LABELS];
         u8                      rt_protocol; /* routing protocol that set this entry */
+        u8                      rt_payload_type;
         u8                      rt_labels;
         u8                      rt_via_alen;
         u8                      rt_via_table;
@@ -96,16 +108,8 @@ EXPORT_SYMBOL_GPL(mpls_pkt_too_big);
 static bool mpls_egress(struct mpls_route *rt, struct sk_buff *skb,
                         struct mpls_entry_decoded dec)
 {
-        /* RFC4385 and RFC5586 encode other packets in mpls such that
-         * they don't conflict with the ip version number, making
-         * decoding by examining the ip version correct in everything
-         * except for the strangest cases.
-         *
-         * The strange cases if we choose to support them will require
-         * manual configuration.
-         */
-        struct iphdr *hdr4;
-        bool success = true;
+        enum mpls_payload_type payload_type;
+        bool success = false;
 
         /* The IPv4 code below accesses through the IPv4 header
          * checksum, which is 12 bytes into the packet.
@@ -120,23 +124,32 @@ static bool mpls_egress(struct mpls_route *rt, struct sk_buff *skb,
         if (!pskb_may_pull(skb, 12))
                 return false;
 
-        /* Use ip_hdr to find the ip protocol version */
-        hdr4 = ip_hdr(skb);
-        if (hdr4->version == 4) {
+        payload_type = rt->rt_payload_type;
+        if (payload_type == MPT_UNSPEC)
+                payload_type = ip_hdr(skb)->version;
+
+        switch (payload_type) {
+        case MPT_IPV4: {
+                struct iphdr *hdr4 = ip_hdr(skb);
                 skb->protocol = htons(ETH_P_IP);
                 csum_replace2(&hdr4->check,
                               htons(hdr4->ttl << 8),
                               htons(dec.ttl << 8));
                 hdr4->ttl = dec.ttl;
+                success = true;
+                break;
         }
-        else if (hdr4->version == 6) {
+        case MPT_IPV6: {
                 struct ipv6hdr *hdr6 = ipv6_hdr(skb);
                 skb->protocol = htons(ETH_P_IPV6);
                 hdr6->hop_limit = dec.ttl;
+                success = true;
+                break;
         }
-        else
-                /* version 0 and version 1 are used by pseudo wires */
-                success = false;
+        case MPT_UNSPEC:
+                break;
+        }
+
         return success;
 }
 
@@ -255,16 +268,17 @@ static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = {
 };
 
 struct mpls_route_config {
-        u32             rc_protocol;
-        u32             rc_ifindex;
-        u16             rc_via_table;
-        u16             rc_via_alen;
-        u8              rc_via[MAX_VIA_ALEN];
-        u32             rc_label;
-        u32             rc_output_labels;
-        u32             rc_output_label[MAX_NEW_LABELS];
-        u32             rc_nlflags;
-        struct nl_info  rc_nlinfo;
+        u32                     rc_protocol;
+        u32                     rc_ifindex;
+        u16                     rc_via_table;
+        u16                     rc_via_alen;
+        u8                      rc_via[MAX_VIA_ALEN];
+        u32                     rc_label;
+        u32                     rc_output_labels;
+        u32                     rc_output_label[MAX_NEW_LABELS];
+        u32                     rc_nlflags;
+        enum mpls_payload_type  rc_payload_type;
+        struct nl_info          rc_nlinfo;
 };
 
 static struct mpls_route *mpls_rt_alloc(size_t alen)
@@ -493,6 +507,7 @@ static int mpls_route_add(struct mpls_route_config *cfg)
                 rt->rt_label[i] = cfg->rc_output_label[i];
         rt->rt_protocol = cfg->rc_protocol;
         RCU_INIT_POINTER(rt->rt_dev, dev);
+        rt->rt_payload_type = cfg->rc_payload_type;
         rt->rt_via_table = cfg->rc_via_table;
         memcpy(rt->rt_via, cfg->rc_via, cfg->rc_via_alen);
 
@@ -1047,6 +1062,7 @@ static int resize_platform_label_table(struct net *net, size_t limit)
                         goto nort0;
                 RCU_INIT_POINTER(rt0->rt_dev, lo);
                 rt0->rt_protocol = RTPROT_KERNEL;
+                rt0->rt_payload_type = MPT_IPV4;
                 rt0->rt_via_table = NEIGH_LINK_TABLE;
                 memcpy(rt0->rt_via, lo->dev_addr, lo->addr_len);
         }
@@ -1057,6 +1073,7 @@ static int resize_platform_label_table(struct net *net, size_t limit)
                         goto nort2;
                 RCU_INIT_POINTER(rt2->rt_dev, lo);
                 rt2->rt_protocol = RTPROT_KERNEL;
+                rt2->rt_payload_type = MPT_IPV6;
                 rt2->rt_via_table = NEIGH_LINK_TABLE;
                 memcpy(rt2->rt_via, lo->dev_addr, lo->addr_len);
         }