Patch "ipmr: support IP_PKTINFO on cache report IGMP msg" has been added to the 6.6-stable tree

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

    ipmr: support IP_PKTINFO on cache report IGMP msg

to the 6.6-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:
     ipmr-support-ip_pktinfo-on-cache-report-igmp-msg.patch
and it can be found in the queue-6.6 subdirectory.

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



commit 4b09d6ba5acf6b2835cf704859d91d536ef1fb69
Author: Leone Fernando <leone4fernando@xxxxxxxxx>
Date:   Wed Dec 13 17:19:35 2023 +0100

    ipmr: support IP_PKTINFO on cache report IGMP msg
    
    [ Upstream commit bb7403655b3c3eb245d0ee330047cd3e20b3c4af ]
    
    In order to support IP_PKTINFO on those packets, we need to call
    ipv4_pktinfo_prepare.
    
    When sending mrouted/pimd daemons a cache report IGMP msg, it is
    unnecessary to set dst on the newly created skb.
    It used to be necessary on older versions until
    commit d826eb14ecef ("ipv4: PKTINFO doesnt need dst reference") which
    changed the way IP_PKTINFO struct is been retrieved.
    
    Changes from v1:
    1. Undo changes in ipv4_pktinfo_prepare function. use it directly
       and copy the control block.
    
    Fixes: d826eb14ecef ("ipv4: PKTINFO doesnt need dst reference")
    Signed-off-by: Leone Fernando <leone4fernando@xxxxxxxxx>
    Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 9e222a57bc2b..0063a237253b 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1025,6 +1025,10 @@ static int ipmr_cache_report(const struct mr_table *mrt,
 	struct sk_buff *skb;
 	int ret;
 
+	mroute_sk = rcu_dereference(mrt->mroute_sk);
+	if (!mroute_sk)
+		return -EINVAL;
+
 	if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE)
 		skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
 	else
@@ -1069,7 +1073,8 @@ static int ipmr_cache_report(const struct mr_table *mrt,
 		msg = (struct igmpmsg *)skb_network_header(skb);
 		msg->im_vif = vifi;
 		msg->im_vif_hi = vifi >> 8;
-		skb_dst_set(skb, dst_clone(skb_dst(pkt)));
+		ipv4_pktinfo_prepare(mroute_sk, pkt);
+		memcpy(skb->cb, pkt->cb, sizeof(skb->cb));
 		/* Add our header */
 		igmp = skb_put(skb, sizeof(struct igmphdr));
 		igmp->type = assert;
@@ -1079,12 +1084,6 @@ static int ipmr_cache_report(const struct mr_table *mrt,
 		skb->transport_header = skb->network_header;
 	}
 
-	mroute_sk = rcu_dereference(mrt->mroute_sk);
-	if (!mroute_sk) {
-		kfree_skb(skb);
-		return -EINVAL;
-	}
-
 	igmpmsg_netlink_event(mrt, skb);
 
 	/* Deliver to mrouted */




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