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xfrm: Switch to skb_dstref_steal to clear dst_entry

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Going forward skb_dst_set will assert that skb dst_entry
is empty during skb_dst_set. skb_dstref_steal is added to reset
existing entry without doing refcnt. Switch to skb_dstref_steal
in __xfrm_route_forward and add a comment on why it's safe
to skip skb_dstref_restore.

Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20250818154032.3173645-3-sdf@fomichev.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Stanislav Fomichev
2025-08-18 08:40:27 -07:00
committed by Jakub Kicinski
parent c3f0c02997
commit c829aab21e
1 changed files with 8 additions and 2 deletions
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10
net/xfrm/xfrm_policy.c
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@@ -3881,12 +3881,18 @@ int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
}
skb_dst_force(skb);
if (!skb_dst(skb)) {
dst = skb_dst(skb);
if (!dst) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
return 0;
}
dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
/* ignore return value from skb_dstref_steal, xfrm_lookup takes
* care of dropping the refcnt if needed.
*/
skb_dstref_steal(skb);
dst = xfrm_lookup(net, dst, &fl, NULL, XFRM_LOOKUP_QUEUE);
if (IS_ERR(dst)) {
res = 0;
dst = NULL;