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Message-Id: <20200717062331.691152-19-hch@lst.de>
Date: Fri, 17 Jul 2020 08:23:27 +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 18/22] net/ipv6: factor out MCAST_MSFILTER getsockopt helpers
Factor out one helper each for getting the native and compat
version of the MCAST_MSFILTER option.
Signed-off-by: Christoph Hellwig <hch@....de>
---
net/ipv6/ipv6_sockglue.c | 139 +++++++++++++++++++++------------------
1 file changed, 74 insertions(+), 65 deletions(-)
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 6adfbdcb7979bd..ef5656f876ac05 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -1071,6 +1071,77 @@ static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
return len;
}
+static int ipv6_get_msfilter(struct sock *sk, void __user *optval,
+ int __user *optlen, int len)
+{
+ const int size0 = offsetof(struct group_filter, gf_slist);
+ struct group_filter __user *p = optval;
+ struct group_filter gsf;
+ int num;
+ int err;
+
+ if (len < size0)
+ return -EINVAL;
+ if (copy_from_user(&gsf, p, size0))
+ return -EFAULT;
+ if (gsf.gf_group.ss_family != AF_INET6)
+ return -EADDRNOTAVAIL;
+ num = gsf.gf_numsrc;
+ lock_sock(sk);
+ err = ip6_mc_msfget(sk, &gsf, p->gf_slist);
+ if (!err) {
+ if (num > gsf.gf_numsrc)
+ num = gsf.gf_numsrc;
+ if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
+ copy_to_user(p, &gsf, size0))
+ err = -EFAULT;
+ }
+ release_sock(sk);
+ return err;
+}
+
+#ifdef CONFIG_COMPAT
+static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval,
+ int __user *optlen)
+{
+ const int size0 = offsetof(struct compat_group_filter, gf_slist);
+ struct compat_group_filter __user *p = optval;
+ struct compat_group_filter gf32;
+ struct group_filter gf;
+ int len, err;
+ int num;
+
+ if (get_user(len, optlen))
+ return -EFAULT;
+ if (len < size0)
+ return -EINVAL;
+
+ if (copy_from_user(&gf32, p, size0))
+ return -EFAULT;
+ gf.gf_interface = gf32.gf_interface;
+ gf.gf_fmode = gf32.gf_fmode;
+ num = gf.gf_numsrc = gf32.gf_numsrc;
+ gf.gf_group = gf32.gf_group;
+
+ if (gf.gf_group.ss_family != AF_INET6)
+ return -EADDRNOTAVAIL;
+
+ lock_sock(sk);
+ err = ip6_mc_msfget(sk, &gf, p->gf_slist);
+ release_sock(sk);
+ if (err)
+ return err;
+ if (num > gf.gf_numsrc)
+ num = gf.gf_numsrc;
+ len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
+ if (put_user(len, optlen) ||
+ put_user(gf.gf_fmode, &p->gf_fmode) ||
+ put_user(gf.gf_numsrc, &p->gf_numsrc))
+ return -EFAULT;
+ return 0;
+}
+#endif
+
static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen, unsigned int flags)
{
@@ -1094,33 +1165,7 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
val = sk->sk_family;
break;
case MCAST_MSFILTER:
- {
- struct group_filter __user *p = (void __user *)optval;
- struct group_filter gsf;
- const int size0 = offsetof(struct group_filter, gf_slist);
- int num;
- int err;
-
- if (len < size0)
- return -EINVAL;
- if (copy_from_user(&gsf, p, size0))
- return -EFAULT;
- if (gsf.gf_group.ss_family != AF_INET6)
- return -EADDRNOTAVAIL;
- num = gsf.gf_numsrc;
- lock_sock(sk);
- err = ip6_mc_msfget(sk, &gsf, p->gf_slist);
- if (!err) {
- if (num > gsf.gf_numsrc)
- num = gsf.gf_numsrc;
- if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
- copy_to_user(p, &gsf, size0))
- err = -EFAULT;
- }
- release_sock(sk);
- return err;
- }
-
+ return ipv6_get_msfilter(sk, optval, optlen, len);
case IPV6_2292PKTOPTIONS:
{
struct msghdr msg;
@@ -1481,44 +1526,8 @@ int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
if (level != SOL_IPV6)
return -ENOPROTOOPT;
- if (optname == MCAST_MSFILTER) {
- const int size0 = offsetof(struct compat_group_filter, gf_slist);
- struct compat_group_filter __user *p = (void __user *)optval;
- struct compat_group_filter gf32;
- struct group_filter gf;
- int ulen, err;
- int num;
-
- if (get_user(ulen, optlen))
- return -EFAULT;
-
- if (ulen < size0)
- return -EINVAL;
-
- if (copy_from_user(&gf32, p, size0))
- return -EFAULT;
-
- gf.gf_interface = gf32.gf_interface;
- gf.gf_fmode = gf32.gf_fmode;
- num = gf.gf_numsrc = gf32.gf_numsrc;
- gf.gf_group = gf32.gf_group;
-
- if (gf.gf_group.ss_family != AF_INET6)
- return -EADDRNOTAVAIL;
- lock_sock(sk);
- err = ip6_mc_msfget(sk, &gf, p->gf_slist);
- release_sock(sk);
- if (err)
- return err;
- if (num > gf.gf_numsrc)
- num = gf.gf_numsrc;
- ulen = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
- if (put_user(ulen, optlen) ||
- put_user(gf.gf_fmode, &p->gf_fmode) ||
- put_user(gf.gf_numsrc, &p->gf_numsrc))
- return -EFAULT;
- return 0;
- }
+ if (optname == MCAST_MSFILTER)
+ return compat_ipv6_get_msfilter(sk, optval, optlen);
err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
MSG_CMSG_COMPAT);
--
2.27.0
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