Patch "xfrm: respect ip protocols rules criteria when performing dst lookups" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    xfrm: respect ip protocols rules criteria when performing dst lookups

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     xfrm-respect-ip-protocols-rules-criteria-when-perfor.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 7f1ecf63258d37ccaf47558adcaf6d4eeb7e0e41
Author: Eyal Birger <eyal.birger@xxxxxxxxx>
Date:   Mon Sep 2 17:07:10 2024 -0700

    xfrm: respect ip protocols rules criteria when performing dst lookups
    
    [ Upstream commit b8469721034300bbb6dec5b4bf32492c95e16a0c ]
    
    The series in the "fixes" tag added the ability to consider L4 attributes
    in routing rules.
    
    The dst lookup on the outer packet of encapsulated traffic in the xfrm
    code was not adapted to this change, thus routing behavior that relies
    on L4 information is not respected.
    
    Pass the ip protocol information when performing dst lookups.
    
    Fixes: a25724b05af0 ("Merge branch 'fib_rules-support-sport-dport-and-proto-match'")
    Signed-off-by: Eyal Birger <eyal.birger@xxxxxxxxx>
    Tested-by: Antony Antony <antony.antony@xxxxxxxxxxx>
    Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 642e0b60130d8..20ce2e1b3f61e 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -322,6 +322,8 @@ struct xfrm_dst_lookup_params {
 	xfrm_address_t *saddr;
 	xfrm_address_t *daddr;
 	u32 mark;
+	__u8 ipproto;
+	union flowi_uli uli;
 };
 
 struct net_device;
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index d1c2619e03740..5d8e38f4ecc07 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -30,6 +30,8 @@ static struct dst_entry *__xfrm4_dst_lookup(struct flowi4 *fl4,
 	fl4->flowi4_mark = params->mark;
 	if (params->saddr)
 		fl4->saddr = params->saddr->a4;
+	fl4->flowi4_proto = params->ipproto;
+	fl4->uli = params->uli;
 
 	rt = __ip_route_output_key(params->net, fl4);
 	if (!IS_ERR(rt))
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 40183fdf7da0e..f5ef5e4c88df1 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -37,6 +37,9 @@ static struct dst_entry *xfrm6_dst_lookup(const struct xfrm_dst_lookup_params *p
 	if (params->saddr)
 		memcpy(&fl6.saddr, params->saddr, sizeof(fl6.saddr));
 
+	fl6.flowi4_proto = params->ipproto;
+	fl6.uli = params->uli;
+
 	dst = ip6_route_output(params->net, NULL, &fl6);
 
 	err = dst->error;
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index ab6f5955aa9cf..55ef8e8329243 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -296,6 +296,21 @@ static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
 	params.tos = tos;
 	params.oif = oif;
 	params.mark = mark;
+	params.ipproto = x->id.proto;
+	if (x->encap) {
+		switch (x->encap->encap_type) {
+		case UDP_ENCAP_ESPINUDP:
+			params.ipproto = IPPROTO_UDP;
+			params.uli.ports.sport = x->encap->encap_sport;
+			params.uli.ports.dport = x->encap->encap_dport;
+			break;
+		case TCP_ENCAP_ESPINTCP:
+			params.ipproto = IPPROTO_TCP;
+			params.uli.ports.sport = x->encap->encap_sport;
+			params.uli.ports.dport = x->encap->encap_dport;
+			break;
+		}
+	}
 
 	dst = __xfrm_dst_lookup(family, &params);