diff options
Diffstat (limited to 'net/core/sock_diag.c')
| -rw-r--r-- | net/core/sock_diag.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c new file mode 100644 index 000000000000..b9868e1fd62c --- /dev/null +++ b/net/core/sock_diag.c @@ -0,0 +1,192 @@ +#include <linux/mutex.h> +#include <linux/socket.h> +#include <linux/skbuff.h> +#include <net/netlink.h> +#include <net/net_namespace.h> +#include <linux/module.h> +#include <linux/rtnetlink.h> +#include <net/sock.h> + +#include <linux/inet_diag.h> +#include <linux/sock_diag.h> + +static struct sock_diag_handler *sock_diag_handlers[AF_MAX]; +static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh); +static DEFINE_MUTEX(sock_diag_table_mutex); + +int sock_diag_check_cookie(void *sk, __u32 *cookie) +{ + if ((cookie[0] != INET_DIAG_NOCOOKIE || + cookie[1] != INET_DIAG_NOCOOKIE) && + ((u32)(unsigned long)sk != cookie[0] || + (u32)((((unsigned long)sk) >> 31) >> 1) != cookie[1])) + return -ESTALE; + else + return 0; +} +EXPORT_SYMBOL_GPL(sock_diag_check_cookie); + +void sock_diag_save_cookie(void *sk, __u32 *cookie) +{ + cookie[0] = (u32)(unsigned long)sk; + cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); +} +EXPORT_SYMBOL_GPL(sock_diag_save_cookie); + +int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype) +{ + __u32 *mem; + + mem = RTA_DATA(__RTA_PUT(skb, attrtype, SK_MEMINFO_VARS * sizeof(__u32))); + + mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk); + mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; + mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk); + mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; + mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; + mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; + mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); + + return 0; + +rtattr_failure: + return -EMSGSIZE; +} +EXPORT_SYMBOL_GPL(sock_diag_put_meminfo); + +void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) +{ + mutex_lock(&sock_diag_table_mutex); + inet_rcv_compat = fn; + mutex_unlock(&sock_diag_table_mutex); +} +EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat); + +void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) +{ + mutex_lock(&sock_diag_table_mutex); + inet_rcv_compat = NULL; + mutex_unlock(&sock_diag_table_mutex); +} +EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat); + +int sock_diag_register(struct sock_diag_handler *hndl) +{ + int err = 0; + + if (hndl->family >= AF_MAX) + return -EINVAL; + + mutex_lock(&sock_diag_table_mutex); + if (sock_diag_handlers[hndl->family]) + err = -EBUSY; + else + sock_diag_handlers[hndl->family] = hndl; + mutex_unlock(&sock_diag_table_mutex); + + return err; +} +EXPORT_SYMBOL_GPL(sock_diag_register); + +void sock_diag_unregister(struct sock_diag_handler *hnld) +{ + int family = hnld->family; + + if (family >= AF_MAX) + return; + + mutex_lock(&sock_diag_table_mutex); + BUG_ON(sock_diag_handlers[family] != hnld); + sock_diag_handlers[family] = NULL; + mutex_unlock(&sock_diag_table_mutex); +} +EXPORT_SYMBOL_GPL(sock_diag_unregister); + +static inline struct sock_diag_handler *sock_diag_lock_handler(int family) +{ + if (sock_diag_handlers[family] == NULL) + request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, + NETLINK_SOCK_DIAG, family); + + mutex_lock(&sock_diag_table_mutex); + return sock_diag_handlers[family]; +} + +static inline void sock_diag_unlock_handler(struct sock_diag_handler *h) +{ + mutex_unlock(&sock_diag_table_mutex); +} + +static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) +{ + int err; + struct sock_diag_req *req = NLMSG_DATA(nlh); + struct sock_diag_handler *hndl; + + if (nlmsg_len(nlh) < sizeof(*req)) + return -EINVAL; + + hndl = sock_diag_lock_handler(req->sdiag_family); + if (hndl == NULL) + err = -ENOENT; + else + err = hndl->dump(skb, nlh); + sock_diag_unlock_handler(hndl); + + return err; +} + +static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) +{ + int ret; + + switch (nlh->nlmsg_type) { + case TCPDIAG_GETSOCK: + case DCCPDIAG_GETSOCK: + if (inet_rcv_compat == NULL) + request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, + NETLINK_SOCK_DIAG, AF_INET); + + mutex_lock(&sock_diag_table_mutex); + if (inet_rcv_compat != NULL) + ret = inet_rcv_compat(skb, nlh); + else + ret = -EOPNOTSUPP; + mutex_unlock(&sock_diag_table_mutex); + + return ret; + case SOCK_DIAG_BY_FAMILY: + return __sock_diag_rcv_msg(skb, nlh); + default: + return -EINVAL; + } +} + +static DEFINE_MUTEX(sock_diag_mutex); + +static void sock_diag_rcv(struct sk_buff *skb) +{ + mutex_lock(&sock_diag_mutex); + netlink_rcv_skb(skb, &sock_diag_rcv_msg); + mutex_unlock(&sock_diag_mutex); +} + +struct sock *sock_diag_nlsk; +EXPORT_SYMBOL_GPL(sock_diag_nlsk); + +static int __init sock_diag_init(void) +{ + sock_diag_nlsk = netlink_kernel_create(&init_net, NETLINK_SOCK_DIAG, 0, + sock_diag_rcv, NULL, THIS_MODULE); + return sock_diag_nlsk == NULL ? -ENOMEM : 0; +} + +static void __exit sock_diag_exit(void) +{ + netlink_kernel_release(sock_diag_nlsk); +} + +module_init(sock_diag_init); +module_exit(sock_diag_exit); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG); |