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inet: introduce dst_rtable() helper

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I added dst_rt6_info() in commit
e8dfd42c17 ("ipv6: introduce dst_rt6_info() helper")

This patch does a similar change for IPv4.

Instead of (struct rtable *)dst casts, we can use :

 #define dst_rtable(_ptr) \
             container_of_const(_ptr, struct rtable, dst)

Patch is smaller than IPv6 one, because IPv4 has skb_rtable() helper.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://lore.kernel.org/r/20240429133009.1227754-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2024-04-29 13:30:09 +00:00
committed by Jakub Kicinski
parent b451767036
commit 05d6d49209
23 changed files with 64 additions and 70 deletions
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2
net/tipc/udp_media.c
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@ -174,7 +174,7 @@ static int tipc_udp_xmit(struct net *net, struct sk_buff *skb,
local_bh_disable();
ndst = dst_cache_get(cache);
if (dst->proto == htons(ETH_P_IP)) {
struct rtable *rt = (struct rtable *)ndst;
struct rtable *rt = dst_rtable(ndst);
if (!rt) {
struct flowi4 fl = {