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Message-Id: <20200717062331.691152-11-hch@lst.de>
Date: Fri, 17 Jul 2020 08:23:19 +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 10/22] netfilter/ebtables: clean up compat {get,set}sockopt handling
Merge the native and compat {get,set}sockopt handlers using
in_compat_syscall(). Note that this required moving a fair
amout of code around to be done sanely.
Signed-off-by: Christoph Hellwig <hch@....de>
---
net/bridge/netfilter/ebtables.c | 214 +++++++++++++++-----------------
1 file changed, 98 insertions(+), 116 deletions(-)
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index c83ffe9121639c..fe13108af1f542 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1451,86 +1451,6 @@ static int copy_everything_to_user(struct ebt_table *t, void __user *user,
ebt_entry_to_user, entries, tmp.entries);
}
-static int do_ebt_set_ctl(struct sock *sk,
- int cmd, void __user *user, unsigned int len)
-{
- int ret;
- struct net *net = sock_net(sk);
-
- if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
- return -EPERM;
-
- switch (cmd) {
- case EBT_SO_SET_ENTRIES:
- ret = do_replace(net, user, len);
- break;
- case EBT_SO_SET_COUNTERS:
- ret = update_counters(net, user, len);
- break;
- default:
- ret = -EINVAL;
- }
- return ret;
-}
-
-static int do_ebt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
-{
- int ret;
- struct ebt_replace tmp;
- struct ebt_table *t;
- struct net *net = sock_net(sk);
-
- if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
- return -EPERM;
-
- if (copy_from_user(&tmp, user, sizeof(tmp)))
- return -EFAULT;
-
- tmp.name[sizeof(tmp.name) - 1] = '\0';
-
- t = find_table_lock(net, tmp.name, &ret, &ebt_mutex);
- if (!t)
- return ret;
-
- switch (cmd) {
- case EBT_SO_GET_INFO:
- case EBT_SO_GET_INIT_INFO:
- if (*len != sizeof(struct ebt_replace)) {
- ret = -EINVAL;
- mutex_unlock(&ebt_mutex);
- break;
- }
- if (cmd == EBT_SO_GET_INFO) {
- tmp.nentries = t->private->nentries;
- tmp.entries_size = t->private->entries_size;
- tmp.valid_hooks = t->valid_hooks;
- } else {
- tmp.nentries = t->table->nentries;
- tmp.entries_size = t->table->entries_size;
- tmp.valid_hooks = t->table->valid_hooks;
- }
- mutex_unlock(&ebt_mutex);
- if (copy_to_user(user, &tmp, *len) != 0) {
- ret = -EFAULT;
- break;
- }
- ret = 0;
- break;
-
- case EBT_SO_GET_ENTRIES:
- case EBT_SO_GET_INIT_ENTRIES:
- ret = copy_everything_to_user(t, user, len, cmd);
- mutex_unlock(&ebt_mutex);
- break;
-
- default:
- mutex_unlock(&ebt_mutex);
- ret = -EINVAL;
- }
-
- return ret;
-}
-
#ifdef CONFIG_COMPAT
/* 32 bit-userspace compatibility definitions. */
struct compat_ebt_replace {
@@ -2314,28 +2234,6 @@ static int compat_update_counters(struct net *net, void __user *user,
hlp.num_counters, user, len);
}
-static int compat_do_ebt_set_ctl(struct sock *sk,
- int cmd, void __user *user, unsigned int len)
-{
- int ret;
- struct net *net = sock_net(sk);
-
- if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
- return -EPERM;
-
- switch (cmd) {
- case EBT_SO_SET_ENTRIES:
- ret = compat_do_replace(net, user, len);
- break;
- case EBT_SO_SET_COUNTERS:
- ret = compat_update_counters(net, user, len);
- break;
- default:
- ret = -EINVAL;
- }
- return ret;
-}
-
static int compat_do_ebt_get_ctl(struct sock *sk, int cmd,
void __user *user, int *len)
{
@@ -2344,14 +2242,6 @@ static int compat_do_ebt_get_ctl(struct sock *sk, int cmd,
struct ebt_table *t;
struct net *net = sock_net(sk);
- if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
- return -EPERM;
-
- /* try real handler in case userland supplied needed padding */
- if ((cmd == EBT_SO_GET_INFO ||
- cmd == EBT_SO_GET_INIT_INFO) && *len != sizeof(tmp))
- return do_ebt_get_ctl(sk, cmd, user, len);
-
if (copy_from_user(&tmp, user, sizeof(tmp)))
return -EFAULT;
@@ -2413,20 +2303,112 @@ static int compat_do_ebt_get_ctl(struct sock *sk, int cmd,
}
#endif
+static int do_ebt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
+{
+ struct net *net = sock_net(sk);
+ struct ebt_replace tmp;
+ struct ebt_table *t;
+ int ret;
+
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+#ifdef CONFIG_COMPAT
+ /* try real handler in case userland supplied needed padding */
+ if (in_compat_syscall() &&
+ ((cmd != EBT_SO_GET_INFO && cmd != EBT_SO_GET_INIT_INFO) ||
+ *len != sizeof(tmp)))
+ return compat_do_ebt_get_ctl(sk, cmd, user, len);
+#endif
+
+ if (copy_from_user(&tmp, user, sizeof(tmp)))
+ return -EFAULT;
+
+ tmp.name[sizeof(tmp.name) - 1] = '\0';
+
+ t = find_table_lock(net, tmp.name, &ret, &ebt_mutex);
+ if (!t)
+ return ret;
+
+ switch (cmd) {
+ case EBT_SO_GET_INFO:
+ case EBT_SO_GET_INIT_INFO:
+ if (*len != sizeof(struct ebt_replace)) {
+ ret = -EINVAL;
+ mutex_unlock(&ebt_mutex);
+ break;
+ }
+ if (cmd == EBT_SO_GET_INFO) {
+ tmp.nentries = t->private->nentries;
+ tmp.entries_size = t->private->entries_size;
+ tmp.valid_hooks = t->valid_hooks;
+ } else {
+ tmp.nentries = t->table->nentries;
+ tmp.entries_size = t->table->entries_size;
+ tmp.valid_hooks = t->table->valid_hooks;
+ }
+ mutex_unlock(&ebt_mutex);
+ if (copy_to_user(user, &tmp, *len) != 0) {
+ ret = -EFAULT;
+ break;
+ }
+ ret = 0;
+ break;
+
+ case EBT_SO_GET_ENTRIES:
+ case EBT_SO_GET_INIT_ENTRIES:
+ ret = copy_everything_to_user(t, user, len, cmd);
+ mutex_unlock(&ebt_mutex);
+ break;
+
+ default:
+ mutex_unlock(&ebt_mutex);
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static int do_ebt_set_ctl(struct sock *sk, int cmd, void __user *user,
+ unsigned int len)
+{
+ struct net *net = sock_net(sk);
+ int ret;
+
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+ switch (cmd) {
+ case EBT_SO_SET_ENTRIES:
+#ifdef CONFIG_COMPAT
+ if (in_compat_syscall())
+ ret = compat_do_replace(net, user, len);
+ else
+#endif
+ ret = do_replace(net, user, len);
+ break;
+ case EBT_SO_SET_COUNTERS:
+#ifdef CONFIG_COMPAT
+ if (in_compat_syscall())
+ ret = compat_update_counters(net, user, len);
+ else
+#endif
+ ret = update_counters(net, user, len);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ return ret;
+}
+
static struct nf_sockopt_ops ebt_sockopts = {
.pf = PF_INET,
.set_optmin = EBT_BASE_CTL,
.set_optmax = EBT_SO_SET_MAX + 1,
.set = do_ebt_set_ctl,
-#ifdef CONFIG_COMPAT
- .compat_set = compat_do_ebt_set_ctl,
-#endif
.get_optmin = EBT_BASE_CTL,
.get_optmax = EBT_SO_GET_MAX + 1,
.get = do_ebt_get_ctl,
-#ifdef CONFIG_COMPAT
- .compat_get = compat_do_ebt_get_ctl,
-#endif
.owner = THIS_MODULE,
};
--
2.27.0
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