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Message-Id: <20200717062331.691152-16-hch@lst.de>
Date: Fri, 17 Jul 2020 08:23:24 +0200
From: Christoph Hellwig <hch@....de>
To: "David S. Miller" <davem@...emloft.net>
Cc: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Chas Williams <3chas3@...il.com>,
Pablo Neira Ayuso <pablo@...filter.org>,
Jozsef Kadlecsik <kadlec@...filter.org>,
Florian Westphal <fw@...len.de>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
bpf@...r.kernel.org, netfilter-devel@...r.kernel.org,
linux-sctp@...r.kernel.org, linux-arch@...r.kernel.org,
linux-bluetooth@...r.kernel.org, bridge@...ts.linux-foundation.org,
linux-can@...r.kernel.org, dccp@...r.kernel.org,
linux-wpan@...r.kernel.org, mptcp@...ts.01.org
Subject: [PATCH 15/22] net/ipv4: factor out MCAST_MSFILTER setsockopt helpers
Factor out one helper each for setting the native and compat
version of the MCAST_MSFILTER option.
Signed-off-by: Christoph Hellwig <hch@....de>
---
net/ipv4/ip_sockglue.c | 162 ++++++++++++++++++++++-------------------
1 file changed, 86 insertions(+), 76 deletions(-)
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 70d32c9476a2e3..b587dee006f882 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -722,6 +722,90 @@ static int do_mcast_group_source(struct sock *sk, int optname,
return ip_mc_source(add, omode, sk, &mreqs, greqs->gsr_interface);
}
+static int ip_set_mcast_msfilter(struct sock *sk, void __user *optval,
+ int optlen)
+{
+ struct group_filter *gsf = NULL;
+ int err;
+
+ 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 */
+ err = -ENOBUFS;
+ if (gsf->gf_numsrc >= 0x1ffffff ||
+ gsf->gf_numsrc > sock_net(sk)->ipv4.sysctl_igmp_max_msf)
+ goto out_free_gsf;
+
+ err = -EINVAL;
+ if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
+ goto out_free_gsf;
+
+ err = set_mcast_msfilter(sk, gsf->gf_interface, gsf->gf_numsrc,
+ gsf->gf_fmode, &gsf->gf_group, gsf->gf_slist);
+out_free_gsf:
+ kfree(gsf);
+ return err;
+}
+
+#ifdef CONFIG_COMPAT
+static int compat_ip_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;
+ unsigned int n;
+ void *p;
+ int err;
+
+ 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 */
+
+ err = -EFAULT;
+ if (copy_from_user(gf32, optval, optlen))
+ goto out_free_gsf;
+
+ /* numsrc >= (4G-140)/128 overflow in 32 bits */
+ n = gf32->gf_numsrc;
+ err = -ENOBUFS;
+ if (n >= 0x1ffffff)
+ goto out_free_gsf;
+
+ err = -EINVAL;
+ if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen)
+ goto out_free_gsf;
+
+ rtnl_lock();
+ lock_sock(sk);
+
+ /* numsrc >= (4G-140)/128 overflow in 32 bits */
+ err = -ENOBUFS;
+ if (n > sock_net(sk)->ipv4.sysctl_igmp_max_msf)
+ goto out_unlock;
+ err = set_mcast_msfilter(sk, gf32->gf_interface, n, gf32->gf_fmode,
+ &gf32->gf_group, gf32->gf_slist);
+out_unlock:
+ release_sock(sk);
+ rtnl_unlock();
+out_free_gsf:
+ kfree(p);
+ return err;
+}
+#endif
+
static int do_ip_setsockopt(struct sock *sk, int level,
int optname, char __user *optval, unsigned int optlen)
{
@@ -1167,37 +1251,8 @@ static int do_ip_setsockopt(struct sock *sk, int level,
break;
}
case MCAST_MSFILTER:
- {
- struct group_filter *gsf = NULL;
-
- if (optlen < GROUP_FILTER_SIZE(0))
- goto e_inval;
- if (optlen > sysctl_optmem_max) {
- err = -ENOBUFS;
- break;
- }
- gsf = memdup_user(optval, optlen);
- if (IS_ERR(gsf)) {
- err = PTR_ERR(gsf);
- break;
- }
- /* numsrc >= (4G-140)/128 overflow in 32 bits */
- if (gsf->gf_numsrc >= 0x1ffffff ||
- gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
- err = -ENOBUFS;
- goto mc_msf_out;
- }
- if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
- err = -EINVAL;
- goto mc_msf_out;
- }
- err = set_mcast_msfilter(sk, gsf->gf_interface,
- gsf->gf_numsrc, gsf->gf_fmode,
- &gsf->gf_group, gsf->gf_slist);
-mc_msf_out:
- kfree(gsf);
+ err = ip_set_mcast_msfilter(sk, optval, optlen);
break;
- }
case IP_MULTICAST_ALL:
if (optlen < 1)
goto e_inval;
@@ -1391,52 +1446,7 @@ int compat_ip_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;
- unsigned int n;
- void *p;
-
- 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 >= 0x1ffffff) {
- 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);
- /* numsrc >= (4G-140)/128 overflow in 32 bits */
- if (n > sock_net(sk)->ipv4.sysctl_igmp_max_msf)
- err = -ENOBUFS;
- else
- err = set_mcast_msfilter(sk, gf32->gf_interface,
- n, gf32->gf_fmode,
- &gf32->gf_group, gf32->gf_slist);
- release_sock(sk);
- rtnl_unlock();
-mc_msf_out:
- kfree(p);
- return err;
- }
+ return compat_ip_set_mcast_msfilter(sk, optval, optlen);
}
err = do_ip_setsockopt(sk, level, optname, optval, optlen);
--
2.27.0
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