From 571912c69f0ed731bd1e071ade9dc7ca4aa52065 Mon Sep 17 00:00:00 2001 From: Martin Varghese Date: Mon, 24 Feb 2020 10:57:50 +0530 Subject: 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 Acked-by: Willem de Bruijn Signed-off-by: David S. Miller --- net/ipv6/ip6_output.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) (limited to 'net/ipv6/ip6_output.c') 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 #include #include +#include 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) { -- cgit v1.2.3