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From: Christoph Hellwig <hch@lst.de>
To: "David S. Miller" <davem@davemloft.net>
Cc: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Chas Williams <3chas3@gmail.com>,
	Pablo Neira Ayuso <pablo@netfilter.org>,
	Jozsef Kadlecsik <kadlec@netfilter.org>,
	Florian Westphal <fw@strlen.de>,
	Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, netfilter-devel@vger.kernel.org,
	linux-sctp@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-bluetooth@vger.kernel.org,
	bridge@lists.linux-foundation.org, linux-can@vger.kernel.org,
	dccp@vger.kernel.org, linux-wpan@vger.kernel.org,
	mptcp@lists.01.org
Subject: [PATCH 19/22] net/ipv6: factor out MCAST_MSFILTER setsockopt helpers
Date: Fri, 17 Jul 2020 08:23:28 +0200
Message-ID: <20200717062331.691152-20-hch@lst.de> (raw)
In-Reply-To: <20200717062331.691152-1-hch@lst.de>

Factor out one helper each for setting the native and compat
version of the MCAST_MSFILTER option.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 net/ipv6/ipv6_sockglue.c | 159 ++++++++++++++++++++-------------------
 1 file changed, 83 insertions(+), 76 deletions(-)

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index ef5656f876ac05..6aa49495d7bc0b 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -171,6 +171,87 @@ static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
 	return ip6_mc_source(add, omode, sk, greqs);
 }
 
+static int ipv6_set_mcast_msfilter(struct sock *sk, void __user *optval,
+		int optlen)
+{
+	struct group_filter *gsf;
+	int ret;
+
+	if (optlen < GROUP_FILTER_SIZE(0))
+		return -EINVAL;
+	if (optlen > sysctl_optmem_max)
+		return -ENOBUFS;
+
+	gsf = memdup_user(optval, optlen);
+	if (IS_ERR(gsf))
+		return PTR_ERR(gsf);
+
+	/* numsrc >= (4G-140)/128 overflow in 32 bits */
+	ret = -ENOBUFS;
+	if (gsf->gf_numsrc >= 0x1ffffffU ||
+	    gsf->gf_numsrc > sysctl_mld_max_msf)
+		goto out_free_gsf;
+
+	ret = -EINVAL;
+	if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
+		goto out_free_gsf;
+
+	ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist);
+out_free_gsf:
+	kfree(gsf);
+	return ret;
+}
+
+#ifdef CONFIG_COMPAT
+static int compat_ipv6_set_mcast_msfilter(struct sock *sk, void __user *optval,
+		int optlen)
+{
+	const int size0 = offsetof(struct compat_group_filter, gf_slist);
+	struct compat_group_filter *gf32;
+	void *p;
+	int ret;
+	int n;
+
+	if (optlen < size0)
+		return -EINVAL;
+	if (optlen > sysctl_optmem_max - 4)
+		return -ENOBUFS;
+
+	p = kmalloc(optlen + 4, GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */
+	ret = -EFAULT;
+	if (copy_from_user(gf32, optval, optlen))
+		goto out_free_p;
+
+	/* numsrc >= (4G-140)/128 overflow in 32 bits */
+	ret = -ENOBUFS;
+	n = gf32->gf_numsrc;
+	if (n >= 0x1ffffffU || n > sysctl_mld_max_msf)
+		goto out_free_p;
+
+	ret = -EINVAL;
+	if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen)
+		goto out_free_p;
+
+	rtnl_lock();
+	lock_sock(sk);
+	ret = ip6_mc_msfilter(sk, &(struct group_filter){
+			.gf_interface = gf32->gf_interface,
+			.gf_group = gf32->gf_group,
+			.gf_fmode = gf32->gf_fmode,
+			.gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist);
+	release_sock(sk);
+	rtnl_unlock();
+
+out_free_p:
+	kfree(p);
+	return ret;
+}
+#endif
+
 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 		    char __user *optval, unsigned int optlen)
 {
@@ -762,37 +843,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 		break;
 	}
 	case MCAST_MSFILTER:
-	{
-		struct group_filter *gsf;
-
-		if (optlen < GROUP_FILTER_SIZE(0))
-			goto e_inval;
-		if (optlen > sysctl_optmem_max) {
-			retv = -ENOBUFS;
-			break;
-		}
-		gsf = memdup_user(optval, optlen);
-		if (IS_ERR(gsf)) {
-			retv = PTR_ERR(gsf);
-			break;
-		}
-		/* numsrc >= (4G-140)/128 overflow in 32 bits */
-		if (gsf->gf_numsrc >= 0x1ffffffU ||
-		    gsf->gf_numsrc > sysctl_mld_max_msf) {
-			kfree(gsf);
-			retv = -ENOBUFS;
-			break;
-		}
-		if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
-			kfree(gsf);
-			retv = -EINVAL;
-			break;
-		}
-		retv = ip6_mc_msfilter(sk, gsf, gsf->gf_slist);
-		kfree(gsf);
-
+		retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
 		break;
-	}
 	case IPV6_ROUTER_ALERT:
 		if (optlen < sizeof(int))
 			goto e_inval;
@@ -977,52 +1029,7 @@ int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 		return err;
 	}
 	case MCAST_MSFILTER:
-	{
-		const int size0 = offsetof(struct compat_group_filter, gf_slist);
-		struct compat_group_filter *gf32;
-		void *p;
-		int n;
-
-		if (optlen < size0)
-			return -EINVAL;
-		if (optlen > sysctl_optmem_max - 4)
-			return -ENOBUFS;
-
-		p = kmalloc(optlen + 4, GFP_KERNEL);
-		if (!p)
-			return -ENOMEM;
-
-		gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */
-		if (copy_from_user(gf32, optval, optlen)) {
-			err = -EFAULT;
-			goto mc_msf_out;
-		}
-
-		n = gf32->gf_numsrc;
-		/* numsrc >= (4G-140)/128 overflow in 32 bits */
-		if (n >= 0x1ffffffU ||
-		    n > sysctl_mld_max_msf) {
-			err = -ENOBUFS;
-			goto mc_msf_out;
-		}
-		if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen) {
-			err = -EINVAL;
-			goto mc_msf_out;
-		}
-
-		rtnl_lock();
-		lock_sock(sk);
-		err = ip6_mc_msfilter(sk, &(struct group_filter){
-				.gf_interface = gf32->gf_interface,
-				.gf_group = gf32->gf_group,
-				.gf_fmode = gf32->gf_fmode,
-				.gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist);
-		release_sock(sk);
-		rtnl_unlock();
-mc_msf_out:
-		kfree(p);
-		return err;
-	}
+		return compat_ipv6_set_mcast_msfilter(sk, optval, optlen);
 	}
 
 	err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
-- 
2.27.0


  parent reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-17  6:23 sockopt cleanups Christoph Hellwig
2020-07-17  6:23 ` [PATCH 01/22] net/atm: remove the atmdev_ops {get,set}sockopt methods Christoph Hellwig
2020-07-17  6:23 ` [PATCH 02/22] net: streamline __sys_setsockopt Christoph Hellwig
2020-07-17  6:23 ` [PATCH 03/22] net: streamline __sys_getsockopt Christoph Hellwig
2020-07-17  6:23 ` [PATCH 04/22] net: simplify cBPF setsockopt compat handling Christoph Hellwig
2020-07-17  6:23 ` [PATCH 05/22] net: remove compat_sock_common_{get,set}sockopt Christoph Hellwig
2020-07-17  9:18   ` [MPTCP] " Matthieu Baerts
2020-07-17  9:26   ` Stefan Schmidt
2020-07-17  6:23 ` [PATCH 06/22] net: remove compat_sys_{get,set}sockopt Christoph Hellwig
2020-07-17  6:23 ` [PATCH 07/22] netfilter/arp_tables: clean up compat {get,set}sockopt handling Christoph Hellwig
2020-07-17  6:23 ` [PATCH 08/22] netfilter/ip_tables: " Christoph Hellwig
2020-07-17  6:23 ` [PATCH 09/22] netfilter/ip6_tables: " Christoph Hellwig
2020-07-17  6:23 ` [PATCH 10/22] netfilter/ebtables: " Christoph Hellwig
2020-07-17  6:23 ` [PATCH 11/22] netfilter: remove the compat_{get,set} methods Christoph Hellwig
2020-07-17  6:23 ` [PATCH 12/22] netfilter: remove the compat argument to xt_copy_counters_from_user Christoph Hellwig
2020-07-17  6:23 ` [PATCH 13/22] netfilter: split nf_sockopt Christoph Hellwig
2020-07-17  6:23 ` [PATCH 14/22] net/ipv4: factor out MCAST_MSFILTER getsockopt helpers Christoph Hellwig
2020-07-17  6:23 ` [PATCH 15/22] net/ipv4: factor out MCAST_MSFILTER setsockopt helpers Christoph Hellwig
2020-07-17  6:23 ` [PATCH 16/22] net/ipv4: factor out mcast join/leave " Christoph Hellwig
2020-07-17  6:23 ` [PATCH 17/22] net/ipv4: remove compat_ip_{get,set}sockopt Christoph Hellwig
2020-07-17  6:23 ` [PATCH 18/22] net/ipv6: factor out MCAST_MSFILTER getsockopt helpers Christoph Hellwig
2020-07-17  6:23 ` Christoph Hellwig [this message]
2020-07-17  6:23 ` [PATCH 20/22] net/ipv6: factor out mcast join/leave setsockopt helpers Christoph Hellwig
2020-07-17  6:23 ` [PATCH 21/22] net/ipv6: remove compat_ipv6_{get,set}sockopt Christoph Hellwig
2020-07-17  6:23 ` [PATCH 22/22] net: make ->{get,set}sockopt in proto_ops optional Christoph Hellwig
2020-07-17  8:01   ` Marc Kleine-Budde
2020-07-20  1:16 ` sockopt cleanups David Miller

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