diff options
| author | Beniamino Galvani <b.galvani@gmail.com> | 2023-10-16 09:15:20 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-10-16 09:57:52 +0100 |
| commit | bf3fcbf7e7a08015d3b169bad6281b29d45c272d (patch) | |
| tree | 0dec4c3ede0bbfbea8217ac887e4b0a0f15abb91 /net/ipv4/udp_tunnel_core.c | |
| parent | 3c4fe89878feb57bea6ad9f14997298fddf8dc10 (diff) | |
ipv4: rename and move ip_route_output_tunnel()
At the moment ip_route_output_tunnel() is used only by bareudp.
Ideally, other UDP tunnel implementations should use it, but to do so
the function needs to accept new parameters that are specific for UDP
tunnels, such as the ports.
Prepare for these changes by renaming the function to
udp_tunnel_dst_lookup() and move it to file
net/ipv4/udp_tunnel_core.c.
Suggested-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp_tunnel_core.c')
| -rw-r--r-- | net/ipv4/udp_tunnel_core.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/net/ipv4/udp_tunnel_core.c b/net/ipv4/udp_tunnel_core.c index 1e7e4aecdc48..96f93f92b6ce 100644 --- a/net/ipv4/udp_tunnel_core.c +++ b/net/ipv4/udp_tunnel_core.c @@ -204,4 +204,52 @@ struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family, } EXPORT_SYMBOL_GPL(udp_tun_rx_dst); +struct rtable *udp_tunnel_dst_lookup(struct sk_buff *skb, + struct net_device *dev, + struct net *net, __be32 *saddr, + const struct ip_tunnel_info *info, + u8 protocol, bool use_cache) +{ +#ifdef CONFIG_DST_CACHE + struct dst_cache *dst_cache; +#endif + struct rtable *rt = NULL; + struct flowi4 fl4; + __u8 tos; + +#ifdef CONFIG_DST_CACHE + dst_cache = (struct dst_cache *)&info->dst_cache; + if (use_cache) { + rt = dst_cache_get_ip4(dst_cache, saddr); + if (rt) + return rt; + } +#endif + memset(&fl4, 0, sizeof(fl4)); + fl4.flowi4_mark = skb->mark; + fl4.flowi4_proto = protocol; + fl4.daddr = info->key.u.ipv4.dst; + fl4.saddr = info->key.u.ipv4.src; + tos = info->key.tos; + fl4.flowi4_tos = RT_TOS(tos); + + rt = ip_route_output_key(net, &fl4); + if (IS_ERR(rt)) { + netdev_dbg(dev, "no route to %pI4\n", &fl4.daddr); + return ERR_PTR(-ENETUNREACH); + } + if (rt->dst.dev == dev) { /* is this necessary? */ + netdev_dbg(dev, "circular route to %pI4\n", &fl4.daddr); + ip_rt_put(rt); + return ERR_PTR(-ELOOP); + } +#ifdef CONFIG_DST_CACHE + if (use_cache) + dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr); +#endif + *saddr = fl4.saddr; + return rt; +} +EXPORT_SYMBOL_GPL(udp_tunnel_dst_lookup); + MODULE_LICENSE("GPL"); |