netdev - [PATCH] xfrm: Allow transport-mode states with AF

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Date:   Tue, 21 Feb 2023 13:54:00 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     David George <David.George@...hos.com>
Cc:     Sri Sakthi <srisakthi.s@...il.com>,
        "steffen.klassert@...unet.com" <steffen.klassert@...unet.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Srisakthi Subramaniam <Srisakthi.Subramaniam@...hos.com>,
        Vimal Agrawal <Vimal.Agrawal@...hos.com>
Subject: [PATCH] xfrm: Allow transport-mode states with AF_UNSPEC selector

On Tue, Feb 21, 2023 at 12:05:26PM +0800, Herbert Xu wrote:
> 
> OK I wasn't aware of this.  This definitely looks buggy.  We need
> to fix this bogus check.

It looks like I actually added this bogus check :)

Does this patch work for you?

---8<---
xfrm state selectors are matched against the inner-most flow
which can be of any address family.  Therefore middle states
in nested configurations need to carry a wildcard selector in
order to work at all.

However, this is currently forbidden for transport-mode states.

Fix this by removing the unnecessary check.

Fixes: 13996378e658 ("[IPSEC]: Rename mode to outer_mode and add inner_mode")
Reported-by: David George <David.George@...hos.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 89c731f4f0c7..6f53841cd162 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -2815,11 +2815,6 @@ int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
 			goto error;
 		}
 
-		if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
-			NL_SET_ERR_MSG(extack, "Only tunnel modes can accommodate an AF_UNSPEC selector");
-			goto error;
-		}
-
 		x->inner_mode = *inner_mode;
 
 		if (x->props.family == AF_INET)
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt