| #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 <net/sock.h> |
| |
| #include <linux/inet_diag.h> |
| #include <linux/sock_diag.h> |
| |
| static const 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[SK_MEMINFO_VARS]; |
| |
| 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); |
| mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; |
| |
| return nla_put(skb, attrtype, sizeof(mem), &mem); |
| } |
| EXPORT_SYMBOL_GPL(sock_diag_put_meminfo); |
| |
| int sock_diag_put_filterinfo(struct user_namespace *user_ns, struct sock *sk, |
| struct sk_buff *skb, int attrtype) |
| { |
| struct nlattr *attr; |
| struct sk_filter *filter; |
| unsigned int len; |
| int err = 0; |
| |
| if (!ns_capable(user_ns, CAP_NET_ADMIN)) { |
| nla_reserve(skb, attrtype, 0); |
| return 0; |
| } |
| |
| rcu_read_lock(); |
| |
| filter = rcu_dereference(sk->sk_filter); |
| len = filter ? filter->len * sizeof(struct sock_filter) : 0; |
| |
| attr = nla_reserve(skb, attrtype, len); |
| if (attr == NULL) { |
| err = -EMSGSIZE; |
| goto out; |
| } |
| |
| if (filter) { |
| struct sock_filter *fb = (struct sock_filter *)nla_data(attr); |
| int i; |
| |
| for (i = 0; i < filter->len; i++, fb++) |
| sk_decode_filter(&filter->insns[i], fb); |
| } |
| |
| out: |
| rcu_read_unlock(); |
| return err; |
| } |
| EXPORT_SYMBOL(sock_diag_put_filterinfo); |
| |
| 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(const 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(const 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 int __sock_diag_cmd(struct sk_buff *skb, struct nlmsghdr *nlh) |
| { |
| int err; |
| struct sock_diag_req *req = nlmsg_data(nlh); |
| const struct sock_diag_handler *hndl; |
| |
| if (nlmsg_len(nlh) < sizeof(*req)) |
| return -EINVAL; |
| |
| if (req->sdiag_family >= AF_MAX) |
| return -EINVAL; |
| |
| if (sock_diag_handlers[req->sdiag_family] == NULL) |
| request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, |
| NETLINK_SOCK_DIAG, req->sdiag_family); |
| |
| mutex_lock(&sock_diag_table_mutex); |
| hndl = sock_diag_handlers[req->sdiag_family]; |
| if (hndl == NULL) |
| err = -ENOENT; |
| else if (nlh->nlmsg_type == SOCK_DIAG_BY_FAMILY) |
| err = hndl->dump(skb, nlh); |
| else if (nlh->nlmsg_type == SOCK_DESTROY_BACKPORT && hndl->destroy) |
| err = hndl->destroy(skb, nlh); |
| else |
| err = -EOPNOTSUPP; |
| mutex_unlock(&sock_diag_table_mutex); |
| |
| 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: |
| case SOCK_DESTROY_BACKPORT: |
| return __sock_diag_cmd(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); |
| } |
| |
| int sock_diag_destroy(struct sock *sk, int err) |
| { |
| if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
| return -EPERM; |
| |
| if (!sk->sk_prot->diag_destroy) |
| return -EOPNOTSUPP; |
| |
| return sk->sk_prot->diag_destroy(sk, err); |
| } |
| EXPORT_SYMBOL_GPL(sock_diag_destroy); |
| |
| static int __net_init diag_net_init(struct net *net) |
| { |
| struct netlink_kernel_cfg cfg = { |
| .input = sock_diag_rcv, |
| }; |
| |
| net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg); |
| return net->diag_nlsk == NULL ? -ENOMEM : 0; |
| } |
| |
| static void __net_exit diag_net_exit(struct net *net) |
| { |
| netlink_kernel_release(net->diag_nlsk); |
| net->diag_nlsk = NULL; |
| } |
| |
| static struct pernet_operations diag_net_ops = { |
| .init = diag_net_init, |
| .exit = diag_net_exit, |
| }; |
| |
| static int __init sock_diag_init(void) |
| { |
| return register_pernet_subsys(&diag_net_ops); |
| } |
| |
| static void __exit sock_diag_exit(void) |
| { |
| unregister_pernet_subsys(&diag_net_ops); |
| } |
| |
| module_init(sock_diag_init); |
| module_exit(sock_diag_exit); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG); |