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Message-Id: <20231016071526.2958108-4-b.galvani@gmail.com> Date: Mon, 16 Oct 2023 09:15:22 +0200 From: Beniamino Galvani <b.galvani@...il.com> To: netdev@...r.kernel.org Cc: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, David Ahern <dsahern@...nel.org>, Guillaume Nault <gnault@...hat.com>, linux-kernel@...r.kernel.org Subject: [PATCH net-next v2 3/7] ipv4: add new arguments to udp_tunnel_dst_lookup() 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@...hat.com> Signed-off-by: Beniamino Galvani <b.galvani@...il.com> Reviewed-by: David Ahern <dsahern@...nel.org> --- drivers/net/bareudp.c | 11 +++++++---- include/net/udp_tunnel.h | 8 +++++--- net/ipv4/udp_tunnel_core.c | 26 +++++++++++++------------- 3 files changed, 25 insertions(+), 20 deletions(-) diff --git a/drivers/net/bareudp.c b/drivers/net/bareudp.c index 6af67cac6bde..47a9c2a5583c 100644 --- a/drivers/net/bareudp.c +++ b/drivers/net/bareudp.c @@ -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); diff --git a/include/net/udp_tunnel.h b/include/net/udp_tunnel.h index 8f110dbd3784..4d0578fab01a 100644 --- a/include/net/udp_tunnel.h +++ b/include/net/udp_tunnel.h @@ -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, diff --git a/net/ipv4/udp_tunnel_core.c b/net/ipv4/udp_tunnel_core.c index 9b0cfd72d5fd..494685e82856 100644 --- a/net/ipv4/udp_tunnel_core.c +++ b/net/ipv4/udp_tunnel_core.c @@ -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; -- 2.40.1
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