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authorYan Yan <evitayan@google.com>2022-01-18 16:00:13 -0800
committerSteffen Klassert <steffen.klassert@secunet.com>2022-01-26 07:44:01 +0100
commitc1aca3080e382886e2e58e809787441984a2f89b (patch)
tree8d03e0813bfc6e59df78dfe705211fe4dfb57cdd /net/key
parent6596a0229541270fb8d38d989f91b78838e5e9da (diff)
downloadlinux-c1aca3080e382886e2e58e809787441984a2f89b.tar.bz2
xfrm: Check if_id in xfrm_migrate
This patch enables distinguishing SAs and SPs based on if_id during the xfrm_migrate flow. This ensures support for xfrm interfaces throughout the SA/SP lifecycle. When there are multiple existing SPs with the same direction, the same xfrm_selector and different endpoint addresses, xfrm_migrate might fail with ENODATA. Specifically, the code path for performing xfrm_migrate is: Stage 1: find policy to migrate with xfrm_migrate_policy_find(sel, dir, type, net) Stage 2: find and update state(s) with xfrm_migrate_state_find(mp, net) Stage 3: update endpoint address(es) of template(s) with xfrm_policy_migrate(pol, m, num_migrate) Currently "Stage 1" always returns the first xfrm_policy that matches, and "Stage 3" looks for the xfrm_tmpl that matches the old endpoint address. Thus if there are multiple xfrm_policy with same selector, direction, type and net, "Stage 1" might rertun a wrong xfrm_policy and "Stage 3" will fail with ENODATA because it cannot find a xfrm_tmpl with the matching endpoint address. The fix is to allow userspace to pass an if_id and add if_id to the matching rule in Stage 1 and Stage 2 since if_id is a unique ID for xfrm_policy and xfrm_state. For compatibility, if_id will only be checked if the attribute is set. Tested with additions to Android's kernel unit test suite: https://android-review.googlesource.com/c/kernel/tests/+/1668886 Signed-off-by: Yan Yan <evitayan@google.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/key')
-rw-r--r--net/key/af_key.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/key/af_key.c b/net/key/af_key.c
index de24a7d474df..9bf52a09b5ff 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -2623,7 +2623,7 @@ static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
}
return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
- kma ? &k : NULL, net, NULL);
+ kma ? &k : NULL, net, NULL, 0);
out:
return err;