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sock_diag: Move the sock_ code to net/core/
This patch moves the sock_ code from inet_diag.c to generic sock_diag.c file and provides necessary request_module-s calls and a pointer on inet_diag_compat dumping routine. Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov
David S. Miller
parent
a029fe26b6
commit
8ef874bfc7
3 changed files with 158 additions and 100 deletions
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@ -8,7 +8,8 @@ obj-y := sock.o request_sock.o skbuff.o iovec.o datagram.o stream.o scm.o \
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obj-$(CONFIG_SYSCTL) += sysctl_net_core.o
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obj-y += dev.o ethtool.o dev_addr_lists.o dst.o netevent.o \
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neighbour.o rtnetlink.o utils.o link_watch.o filter.o
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neighbour.o rtnetlink.o utils.o link_watch.o filter.o \
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sock_diag.o
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obj-$(CONFIG_XFRM) += flow.o
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obj-y += net-sysfs.o
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150
net/core/sock_diag.c
Normal file
150
net/core/sock_diag.c
Normal file
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@ -0,0 +1,150 @@
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#include <linux/mutex.h>
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#include <linux/socket.h>
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#include <linux/skbuff.h>
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#include <net/netlink.h>
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#include <net/net_namespace.h>
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#include <linux/module.h>
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#include <linux/inet_diag.h>
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#include <linux/sock_diag.h>
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static struct sock_diag_handler *sock_diag_handlers[AF_MAX];
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static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh);
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static DEFINE_MUTEX(sock_diag_table_mutex);
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void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
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{
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mutex_lock(&sock_diag_table_mutex);
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inet_rcv_compat = fn;
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mutex_unlock(&sock_diag_table_mutex);
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}
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EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
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void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
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{
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mutex_lock(&sock_diag_table_mutex);
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inet_rcv_compat = NULL;
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mutex_unlock(&sock_diag_table_mutex);
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}
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EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
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int sock_diag_register(struct sock_diag_handler *hndl)
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{
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int err = 0;
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if (hndl->family > AF_MAX)
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return -EINVAL;
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mutex_lock(&sock_diag_table_mutex);
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if (sock_diag_handlers[hndl->family])
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err = -EBUSY;
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else
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sock_diag_handlers[hndl->family] = hndl;
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mutex_unlock(&sock_diag_table_mutex);
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return err;
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}
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EXPORT_SYMBOL_GPL(sock_diag_register);
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void sock_diag_unregister(struct sock_diag_handler *hnld)
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{
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int family = hnld->family;
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if (family > AF_MAX)
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return;
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mutex_lock(&sock_diag_table_mutex);
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BUG_ON(sock_diag_handlers[family] != hnld);
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sock_diag_handlers[family] = NULL;
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mutex_unlock(&sock_diag_table_mutex);
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}
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EXPORT_SYMBOL_GPL(sock_diag_unregister);
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static inline struct sock_diag_handler *sock_diag_lock_handler(int family)
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{
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if (sock_diag_handlers[family] == NULL)
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request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
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NETLINK_SOCK_DIAG, IPPROTO_IP);
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mutex_lock(&sock_diag_table_mutex);
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return sock_diag_handlers[family];
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}
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static inline void sock_diag_unlock_handler(struct sock_diag_handler *h)
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{
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mutex_unlock(&sock_diag_table_mutex);
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}
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static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
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{
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int err;
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struct sock_diag_req *req = NLMSG_DATA(nlh);
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struct sock_diag_handler *hndl;
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if (nlmsg_len(nlh) < sizeof(*req))
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return -EINVAL;
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hndl = sock_diag_lock_handler(req->sdiag_family);
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if (hndl == NULL)
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err = -ENOENT;
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else
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err = hndl->dump(skb, nlh);
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sock_diag_unlock_handler(hndl);
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return err;
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}
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static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
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{
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int ret;
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switch (nlh->nlmsg_type) {
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case TCPDIAG_GETSOCK:
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case DCCPDIAG_GETSOCK:
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if (inet_rcv_compat == NULL)
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request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
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NETLINK_SOCK_DIAG, IPPROTO_IP);
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mutex_lock(&sock_diag_table_mutex);
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if (inet_rcv_compat != NULL)
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ret = inet_rcv_compat(skb, nlh);
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else
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ret = -EOPNOTSUPP;
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mutex_unlock(&sock_diag_table_mutex);
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return ret;
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case SOCK_DIAG_BY_FAMILY:
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return __sock_diag_rcv_msg(skb, nlh);
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default:
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return -EINVAL;
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}
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}
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static DEFINE_MUTEX(sock_diag_mutex);
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static void sock_diag_rcv(struct sk_buff *skb)
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{
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mutex_lock(&sock_diag_mutex);
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netlink_rcv_skb(skb, &sock_diag_rcv_msg);
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mutex_unlock(&sock_diag_mutex);
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}
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struct sock *sock_diag_nlsk;
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EXPORT_SYMBOL_GPL(sock_diag_nlsk);
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static int __init sock_diag_init(void)
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{
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sock_diag_nlsk = netlink_kernel_create(&init_net, NETLINK_SOCK_DIAG, 0,
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sock_diag_rcv, NULL, THIS_MODULE);
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return sock_diag_nlsk == NULL ? -ENOMEM : 0;
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}
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static void __exit sock_diag_exit(void)
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{
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netlink_kernel_release(sock_diag_nlsk);
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}
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module_init(sock_diag_init);
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module_exit(sock_diag_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);
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@ -46,8 +46,6 @@ struct inet_diag_entry {
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u16 userlocks;
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};
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static struct sock *sdiagnl;
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#define INET_DIAG_PUT(skb, attrtype, attrlen) \
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RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
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@ -314,7 +312,7 @@ static int inet_diag_get_exact(struct sk_buff *in_skb,
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kfree_skb(rep);
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goto out;
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}
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err = netlink_unicast(sdiagnl, rep, NETLINK_CB(in_skb).pid,
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err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
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MSG_DONTWAIT);
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if (err > 0)
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err = 0;
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@ -931,7 +929,7 @@ static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
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return -EINVAL;
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}
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return netlink_dump_start(sdiagnl, skb, nlh,
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return netlink_dump_start(sock_diag_nlsk, skb, nlh,
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inet_diag_dump_compat, NULL, 0);
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}
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@ -956,7 +954,7 @@ static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
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return -EINVAL;
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}
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return netlink_dump_start(sdiagnl, skb, h,
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return netlink_dump_start(sock_diag_nlsk, skb, h,
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inet_diag_dump, NULL, 0);
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}
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@ -973,91 +971,6 @@ static struct sock_diag_handler inet6_diag_handler = {
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.dump = inet_diag_handler_dump,
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};
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static struct sock_diag_handler *sock_diag_handlers[AF_MAX];
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static DEFINE_MUTEX(sock_diag_table_mutex);
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int sock_diag_register(struct sock_diag_handler *hndl)
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{
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int err = 0;
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if (hndl->family > AF_MAX)
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return -EINVAL;
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mutex_lock(&sock_diag_table_mutex);
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if (sock_diag_handlers[hndl->family])
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err = -EBUSY;
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else
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sock_diag_handlers[hndl->family] = hndl;
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mutex_unlock(&sock_diag_table_mutex);
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return err;
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}
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void sock_diag_unregister(struct sock_diag_handler *hnld)
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{
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int family = hnld->family;
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if (family > AF_MAX)
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return;
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mutex_lock(&sock_diag_table_mutex);
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BUG_ON(sock_diag_handlers[family] != hnld);
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sock_diag_handlers[family] = NULL;
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mutex_unlock(&sock_diag_table_mutex);
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}
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static inline struct sock_diag_handler *sock_diag_lock_handler(int family)
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{
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mutex_lock(&sock_diag_table_mutex);
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return sock_diag_handlers[family];
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}
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static inline void sock_diag_unlock_handler(struct sock_diag_handler *h)
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{
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mutex_unlock(&sock_diag_table_mutex);
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}
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static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
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{
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int err;
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struct sock_diag_req *req = NLMSG_DATA(nlh);
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struct sock_diag_handler *hndl;
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if (nlmsg_len(nlh) < sizeof(*req))
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return -EINVAL;
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hndl = sock_diag_lock_handler(req->sdiag_family);
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if (hndl == NULL)
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err = -ENOENT;
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else
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err = hndl->dump(skb, nlh);
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sock_diag_unlock_handler(hndl);
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return err;
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}
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static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
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{
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switch (nlh->nlmsg_type) {
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case TCPDIAG_GETSOCK:
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case DCCPDIAG_GETSOCK:
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return inet_diag_rcv_msg_compat(skb, nlh);
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case SOCK_DIAG_BY_FAMILY:
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return __sock_diag_rcv_msg(skb, nlh);
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default:
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return -EINVAL;
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}
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}
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static DEFINE_MUTEX(sock_diag_mutex);
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static void sock_diag_rcv(struct sk_buff *skb)
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{
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mutex_lock(&sock_diag_mutex);
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netlink_rcv_skb(skb, &sock_diag_rcv_msg);
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mutex_unlock(&sock_diag_mutex);
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}
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int inet_diag_register(const struct inet_diag_handler *h)
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{
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const __u16 type = h->idiag_type;
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@ -1101,11 +1014,6 @@ static int __init inet_diag_init(void)
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if (!inet_diag_table)
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goto out;
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sdiagnl = netlink_kernel_create(&init_net, NETLINK_SOCK_DIAG, 0,
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sock_diag_rcv, NULL, THIS_MODULE);
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if (sdiagnl == NULL)
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goto out_free_table;
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err = sock_diag_register(&inet_diag_handler);
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if (err)
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goto out_free_nl;
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@ -1114,14 +1022,13 @@ static int __init inet_diag_init(void)
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if (err)
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goto out_free_inet;
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sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
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out:
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return err;
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out_free_inet:
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sock_diag_unregister(&inet_diag_handler);
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out_free_nl:
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netlink_kernel_release(sdiagnl);
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out_free_table:
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kfree(inet_diag_table);
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goto out;
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}
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@ -1130,11 +1037,11 @@ static void __exit inet_diag_exit(void)
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{
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sock_diag_unregister(&inet6_diag_handler);
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sock_diag_unregister(&inet_diag_handler);
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netlink_kernel_release(sdiagnl);
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sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
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kfree(inet_diag_table);
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}
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module_init(inet_diag_init);
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module_exit(inet_diag_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);
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MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 0);
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