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authorMartin Varghese <martin.varghese@nokia.com>2020-02-24 10:57:50 +0530
committerDavid S. Miller <davem@davemloft.net>2020-02-24 13:31:42 -0800
commit571912c69f0ed731bd1e071ade9dc7ca4aa52065 (patch)
tree319a2ff693104702ebfc44cbf22cbfebc5000fba /net/ipv6
parent48851e9e802de3ede4ce81c3f7896c63e841adbc (diff)
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net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.
The Bareudp tunnel module provides a generic L3 encapsulation tunnelling module for tunnelling different protocols like MPLS, IP,NSH etc inside a UDP tunnel. Signed-off-by: Martin Varghese <martin.varghese@nokia.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/ip6_output.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 087304427bbb..8a8c2d0cfcc8 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -54,6 +54,7 @@
#include <linux/mroute6.h>
#include <net/l3mdev.h>
#include <net/lwtunnel.h>
+#include <net/ip_tunnels.h>
static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
{
@@ -1196,6 +1197,75 @@ struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
}
EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow);
+/**
+ * ip6_dst_lookup_tunnel - perform route lookup on tunnel
+ * @skb: Packet for which lookup is done
+ * @dev: Tunnel device
+ * @net: Network namespace of tunnel device
+ * @sk: Socket which provides route info
+ * @saddr: Memory to store the src ip address
+ * @info: Tunnel information
+ * @protocol: IP protocol
+ * @use_cahce: Flag to enable cache usage
+ * This function performs a route lookup on a tunnel
+ *
+ * It returns a valid dst pointer and stores src address to be used in
+ * tunnel in param saddr on success, else a pointer encoded error code.
+ */
+
+struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb,
+ struct net_device *dev,
+ struct net *net,
+ struct socket *sock,
+ struct in6_addr *saddr,
+ const struct ip_tunnel_info *info,
+ u8 protocol,
+ bool use_cache)
+{
+ struct dst_entry *dst = NULL;
+#ifdef CONFIG_DST_CACHE
+ struct dst_cache *dst_cache;
+#endif
+ struct flowi6 fl6;
+ __u8 prio;
+
+#ifdef CONFIG_DST_CACHE
+ dst_cache = (struct dst_cache *)&info->dst_cache;
+ if (use_cache) {
+ dst = dst_cache_get_ip6(dst_cache, saddr);
+ if (dst)
+ return dst;
+ }
+#endif
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_mark = skb->mark;
+ fl6.flowi6_proto = protocol;
+ fl6.daddr = info->key.u.ipv6.dst;
+ fl6.saddr = info->key.u.ipv6.src;
+ prio = info->key.tos;
+ fl6.flowlabel = ip6_make_flowinfo(RT_TOS(prio),
+ info->key.label);
+
+ dst = ipv6_stub->ipv6_dst_lookup_flow(net, sock->sk, &fl6,
+ NULL);
+ if (IS_ERR(dst)) {
+ netdev_dbg(dev, "no route to %pI6\n", &fl6.daddr);
+ return ERR_PTR(-ENETUNREACH);
+ }
+ if (dst->dev == dev) { /* is this necessary? */
+ netdev_dbg(dev, "circular route to %pI6\n", &fl6.daddr);
+ dst_release(dst);
+ return ERR_PTR(-ELOOP);
+ }
+#ifdef CONFIG_DST_CACHE
+ if (use_cache)
+ dst_cache_set_ip6(dst_cache, dst, &fl6.saddr);
+#endif
+ *saddr = fl6.saddr;
+ return dst;
+}
+EXPORT_SYMBOL_GPL(ip6_dst_lookup_tunnel);
+
static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src,
gfp_t gfp)
{