linux-kernel - [PATCH 07/19] ip6_mc_msfilter(): pass the address list separately

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Message-Id: <20200511044553.1365660-7-viro@ZenIV.linux.org.uk>
Date:   Mon, 11 May 2020 05:45:41 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, viro@...iv.linux.org.uk,
        linux-kernel@...r.kernel.org
Subject: [PATCH 07/19] ip6_mc_msfilter(): pass the address list separately

From: Al Viro <viro@...iv.linux.org.uk>

that way we'll be able to reuse it for compat case

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 include/net/ipv6.h       | 3 ++-
 net/ipv6/ipv6_sockglue.c | 2 +-
 net/ipv6/mcast.c         | 7 ++++---
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 900cc66311c4..901c78b117a1 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -1134,7 +1134,8 @@ struct group_filter;
 
 int ip6_mc_source(int add, int omode, struct sock *sk,
 		  struct group_source_req *pgsr);
-int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
+int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
+		  struct sockaddr_storage *list);
 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 		  struct sockaddr_storage __user *p);
 
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 3f127c6b3c22..33efc9112259 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -780,7 +780,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 			retv = -EINVAL;
 			break;
 		}
-		retv = ip6_mc_msfilter(sk, gsf);
+		retv = ip6_mc_msfilter(sk, gsf, gsf->gf_slist);
 		kfree(gsf);
 
 		break;
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 97d796c7d6c0..7e12d2114158 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -457,7 +457,8 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
 	return err;
 }
 
-int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
+int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
+		    struct sockaddr_storage *list)
 {
 	const struct in6_addr *group;
 	struct ipv6_mc_socklist *pmc;
@@ -509,10 +510,10 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 			goto done;
 		}
 		newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
-		for (i = 0; i < newpsl->sl_count; ++i) {
+		for (i = 0; i < newpsl->sl_count; ++i, ++list) {
 			struct sockaddr_in6 *psin6;
 
-			psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
+			psin6 = (struct sockaddr_in6 *)list;
 			newpsl->sl_addr[i] = psin6->sin6_addr;
 		}
 		err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
-- 
2.11.0