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net: ipmr: rearrange and cleanup setsockopt 

Take rtnl in the beginning unconditionally as most options already need
it (one exception - MRT_DONE, see the comment inside), make the
lock/unlock places central and move out the switch() local variables.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2015-11-21 15:57:31 +01:00 committed by David S. Miller
parent af623236a9
commit 29e97d2145
1 changed files with 109 additions and 86 deletions
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195
net/ipv4/ipmr.c
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@ -1276,38 +1276,45 @@ static void mrtsock_destruct(struct sock *sk)
* MOSPF/PIM router set up we can clean this up.
*/
int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
unsigned int optlen)
{
int ret, parent = 0;
struct net *net = sock_net(sk);
int val, ret = 0, parent = 0;
struct mr_table *mrt;
struct vifctl vif;
struct mfcctl mfc;
struct net *net = sock_net(sk);
struct mr_table *mrt;
u32 uval;
/* There's one exception to the lock - MRT_DONE which needs to unlock */
rtnl_lock();
if (sk->sk_type != SOCK_RAW ||
inet_sk(sk)->inet_num != IPPROTO_IGMP)
return -EOPNOTSUPP;
inet_sk(sk)->inet_num != IPPROTO_IGMP) {
ret = -EOPNOTSUPP;
goto out_unlock;
}
mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
if (!mrt)
return -ENOENT;
if (!mrt) {
ret = -ENOENT;
goto out_unlock;
}
if (optname != MRT_INIT) {
if (sk != rcu_access_pointer(mrt->mroute_sk) &&
!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EACCES;
!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
ret = -EACCES;
goto out_unlock;
}
}
switch (optname) {
case MRT_INIT:
if (optlen != sizeof(int))
return -EINVAL;
rtnl_lock();
if (rtnl_dereference(mrt->mroute_sk)) {
rtnl_unlock();
return -EADDRINUSE;
}
ret = -EINVAL;
if (rtnl_dereference(mrt->mroute_sk))
ret = -EADDRINUSE;
if (ret)
break;
ret = ip_ra_control(sk, 1, mrtsock_destruct);
if (ret == 0) {
@ -1317,30 +1324,41 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsi
NETCONFA_IFINDEX_ALL,
net->ipv4.devconf_all);
}
rtnl_unlock();
return ret;
break;
case MRT_DONE:
if (sk != rcu_access_pointer(mrt->mroute_sk))
return -EACCES;
return ip_ra_control(sk, 0, NULL);
if (sk != rcu_access_pointer(mrt->mroute_sk)) {
ret = -EACCES;
} else {
/* We need to unlock here because mrtsock_destruct takes
* care of rtnl itself and we can't change that due to
* the IP_ROUTER_ALERT setsockopt which runs without it.
*/
rtnl_unlock();
ret = ip_ra_control(sk, 0, NULL);
goto out;
}
break;
case MRT_ADD_VIF:
case MRT_DEL_VIF:
if (optlen != sizeof(vif))
return -EINVAL;
if (copy_from_user(&vif, optval, sizeof(vif)))
return -EFAULT;
if (vif.vifc_vifi >= MAXVIFS)
return -ENFILE;
rtnl_lock();
if (optlen != sizeof(vif)) {
ret = -EINVAL;
break;
}
if (copy_from_user(&vif, optval, sizeof(vif))) {
ret = -EFAULT;
break;
}
if (vif.vifc_vifi >= MAXVIFS) {
ret = -ENFILE;
break;
}
if (optname == MRT_ADD_VIF) {
ret = vif_add(net, mrt, &vif,
sk == rtnl_dereference(mrt->mroute_sk));
} else {
ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
}
rtnl_unlock();
return ret;
break;
/* Manipulate the forwarding caches. These live
* in a sort of kernel/user symbiosis.
*/
@ -1349,82 +1367,87 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsi
parent = -1;
case MRT_ADD_MFC_PROXY:
case MRT_DEL_MFC_PROXY:
if (optlen != sizeof(mfc))
return -EINVAL;
if (copy_from_user(&mfc, optval, sizeof(mfc)))
return -EFAULT;
if (optlen != sizeof(mfc)) {
ret = -EINVAL;
break;
}
if (copy_from_user(&mfc, optval, sizeof(mfc))) {
ret = -EFAULT;
break;
}
if (parent == 0)
parent = mfc.mfcc_parent;
rtnl_lock();
if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
ret = ipmr_mfc_delete(mrt, &mfc, parent);
else
ret = ipmr_mfc_add(net, mrt, &mfc,
sk == rtnl_dereference(mrt->mroute_sk),
parent);
rtnl_unlock();
return ret;
break;
/* Control PIM assert. */
case MRT_ASSERT:
{
int v;
if (optlen != sizeof(v))
return -EINVAL;
if (get_user(v, (int __user *)optval))
return -EFAULT;
mrt->mroute_do_assert = v;
return 0;
}
case MRT_PIM:
{
int v;
if (!pimsm_enabled())
return -ENOPROTOOPT;
if (optlen != sizeof(v))
return -EINVAL;
if (get_user(v, (int __user *)optval))
return -EFAULT;
v = !!v;
rtnl_lock();
ret = 0;
if (v != mrt->mroute_do_pim) {
mrt->mroute_do_pim = v;
mrt->mroute_do_assert = v;
if (optlen != sizeof(val)) {
ret = -EINVAL;
break;
}
rtnl_unlock();
return ret;
}
if (get_user(val, (int __user *)optval)) {
ret = -EFAULT;
break;
}
mrt->mroute_do_assert = val;
break;
case MRT_PIM:
if (!pimsm_enabled()) {
ret = -ENOPROTOOPT;
break;
}
if (optlen != sizeof(val)) {
ret = -EINVAL;
break;
}
if (get_user(val, (int __user *)optval)) {
ret = -EFAULT;
break;
}
val = !!val;
if (val != mrt->mroute_do_pim) {
mrt->mroute_do_pim = val;
mrt->mroute_do_assert = val;
}
break;
case MRT_TABLE:
{
u32 v;
if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) {
ret = -ENOPROTOOPT;
break;
}
if (optlen != sizeof(uval)) {
ret = -EINVAL;
break;
}
if (get_user(uval, (u32 __user *)optval)) {
ret = -EFAULT;
break;
}
if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES))
return -ENOPROTOOPT;
if (optlen != sizeof(u32))
return -EINVAL;
if (get_user(v, (u32 __user *)optval))
return -EFAULT;
rtnl_lock();
ret = 0;
if (sk == rtnl_dereference(mrt->mroute_sk)) {
ret = -EBUSY;
} else {
mrt = ipmr_new_table(net, v);
mrt = ipmr_new_table(net, uval);
if (IS_ERR(mrt))
ret = PTR_ERR(mrt);
else
raw_sk(sk)->ipmr_table = v;
raw_sk(sk)->ipmr_table = uval;
}
rtnl_unlock();
return ret;
}
break;
/* Spurious command, or MRT_VERSION which you cannot set. */
default:
return -ENOPROTOOPT;
ret = -ENOPROTOOPT;
}
out_unlock:
rtnl_unlock();
out:
return ret;
}
/* Getsock opt support for the multicast routing system. */