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Code Issues Releases Wiki Activity

ipv4: add new arguments to udp_tunnel_dst_lookup()

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We want to make the function more generic so that it can be used by
other UDP tunnel implementations such as geneve and vxlan. To do that,
add the following arguments:

 - source and destination UDP port;
 - ifindex of the output interface, needed by vxlan;
 - the tos, because in some cases it is not taken from struct
   ip_tunnel_info (for example, when it's inherited from the inner
   packet);
 - the dst cache, because not all tunnel types (e.g. vxlan) want to
   use the one from struct ip_tunnel_info.

With these parameters, the function no longer needs the full struct
ip_tunnel_info as argument and we can pass only the relevant part of
it (struct ip_tunnel_key).

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>
This commit is contained in:
Beniamino Galvani 2023-10-16 09:15:22 +02:00 committed by David S. Miller
parent 78f3655adc
commit 72fc68c635
3 changed files with 25 additions and 20 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
drivers/net/bareudp.c
View file

@ -306,8 +306,10 @@ static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev,
if (!sock)
return -ESHUTDOWN;
rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, &saddr, info,
use_cache);
rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, 0, &saddr, &info->key,
0, 0, key->tos,
use_cache ?
(struct dst_cache *)&info->dst_cache : NULL);
if (IS_ERR(rt))
return PTR_ERR(rt);
@ -483,8 +485,9 @@ static int bareudp_fill_metadata_dst(struct net_device *dev,
struct rtable *rt;
__be32 saddr;
rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, &saddr,
info, use_cache);
rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, 0, &saddr,
&info->key, 0, 0, info->key.tos,
use_cache ? &info->dst_cache : NULL);
if (IS_ERR(rt))
return PTR_ERR(rt);

8
include/net/udp_tunnel.h
View file

@ -164,9 +164,11 @@ void udp_tunnel_sock_release(struct socket *sock);
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,
bool use_cache);
struct net *net, int oif,
__be32 *saddr,
const struct ip_tunnel_key *key,
__be16 sport, __be16 dport, u8 tos,
struct dst_cache *dst_cache);
struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
__be16 flags, __be64 tunnel_id,

26
net/ipv4/udp_tunnel_core.c
View file

@ -206,31 +206,31 @@ 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,
bool use_cache)
struct net *net, int oif,
__be32 *saddr,
const struct ip_tunnel_key *key,
__be16 sport, __be16 dport, u8 tos,
struct dst_cache *dst_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) {
if (dst_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 = IPPROTO_UDP;
fl4.daddr = info->key.u.ipv4.dst;
fl4.saddr = info->key.u.ipv4.src;
tos = info->key.tos;
fl4.flowi4_oif = oif;
fl4.daddr = key->u.ipv4.dst;
fl4.saddr = key->u.ipv4.src;
fl4.fl4_dport = dport;
fl4.fl4_sport = sport;
fl4.flowi4_tos = RT_TOS(tos);
rt = ip_route_output_key(net, &fl4);
@ -244,7 +244,7 @@ struct rtable *udp_tunnel_dst_lookup(struct sk_buff *skb,
return ERR_PTR(-ELOOP);
}
#ifdef CONFIG_DST_CACHE
if (use_cache)
if (dst_cache)
dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
#endif
*saddr = fl4.saddr;