1 #include <linux/mutex.h> 2 #include <linux/socket.h> 3 #include <linux/skbuff.h> 4 #include <net/netlink.h> 5 #include <net/net_namespace.h> 6 #include <linux/module.h> 7 #include <net/sock.h> 8 9 #include <linux/inet_diag.h> 10 #include <linux/sock_diag.h> 11 12 static const struct sock_diag_handler *sock_diag_handlers[AF_MAX]; 13 static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh); 14 static DEFINE_MUTEX(sock_diag_table_mutex); 15 16 int sock_diag_check_cookie(void *sk, __u32 *cookie) 17 { 18 if ((cookie[0] != INET_DIAG_NOCOOKIE || 19 cookie[1] != INET_DIAG_NOCOOKIE) && 20 ((u32)(unsigned long)sk != cookie[0] || 21 (u32)((((unsigned long)sk) >> 31) >> 1) != cookie[1])) 22 return -ESTALE; 23 else 24 return 0; 25 } 26 EXPORT_SYMBOL_GPL(sock_diag_check_cookie); 27 28 void sock_diag_save_cookie(void *sk, __u32 *cookie) 29 { 30 cookie[0] = (u32)(unsigned long)sk; 31 cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 32 } 33 EXPORT_SYMBOL_GPL(sock_diag_save_cookie); 34 35 int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype) 36 { 37 u32 mem[SK_MEMINFO_VARS]; 38 39 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk); 40 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; 41 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk); 42 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; 43 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; 44 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; 45 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); 46 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; 47 48 return nla_put(skb, attrtype, sizeof(mem), &mem); 49 } 50 EXPORT_SYMBOL_GPL(sock_diag_put_meminfo); 51 52 void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) 53 { 54 mutex_lock(&sock_diag_table_mutex); 55 inet_rcv_compat = fn; 56 mutex_unlock(&sock_diag_table_mutex); 57 } 58 EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat); 59 60 void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) 61 { 62 mutex_lock(&sock_diag_table_mutex); 63 inet_rcv_compat = NULL; 64 mutex_unlock(&sock_diag_table_mutex); 65 } 66 EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat); 67 68 int sock_diag_register(const struct sock_diag_handler *hndl) 69 { 70 int err = 0; 71 72 if (hndl->family >= AF_MAX) 73 return -EINVAL; 74 75 mutex_lock(&sock_diag_table_mutex); 76 if (sock_diag_handlers[hndl->family]) 77 err = -EBUSY; 78 else 79 sock_diag_handlers[hndl->family] = hndl; 80 mutex_unlock(&sock_diag_table_mutex); 81 82 return err; 83 } 84 EXPORT_SYMBOL_GPL(sock_diag_register); 85 86 void sock_diag_unregister(const struct sock_diag_handler *hnld) 87 { 88 int family = hnld->family; 89 90 if (family >= AF_MAX) 91 return; 92 93 mutex_lock(&sock_diag_table_mutex); 94 BUG_ON(sock_diag_handlers[family] != hnld); 95 sock_diag_handlers[family] = NULL; 96 mutex_unlock(&sock_diag_table_mutex); 97 } 98 EXPORT_SYMBOL_GPL(sock_diag_unregister); 99 100 static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 101 { 102 int err; 103 struct sock_diag_req *req = nlmsg_data(nlh); 104 const struct sock_diag_handler *hndl; 105 106 if (nlmsg_len(nlh) < sizeof(*req)) 107 return -EINVAL; 108 109 if (req->sdiag_family >= AF_MAX) 110 return -EINVAL; 111 112 if (sock_diag_handlers[req->sdiag_family] == NULL) 113 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 114 NETLINK_SOCK_DIAG, req->sdiag_family); 115 116 mutex_lock(&sock_diag_table_mutex); 117 hndl = sock_diag_handlers[req->sdiag_family]; 118 if (hndl == NULL) 119 err = -ENOENT; 120 else 121 err = hndl->dump(skb, nlh); 122 mutex_unlock(&sock_diag_table_mutex); 123 124 return err; 125 } 126 127 static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 128 { 129 int ret; 130 131 switch (nlh->nlmsg_type) { 132 case TCPDIAG_GETSOCK: 133 case DCCPDIAG_GETSOCK: 134 if (inet_rcv_compat == NULL) 135 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 136 NETLINK_SOCK_DIAG, AF_INET); 137 138 mutex_lock(&sock_diag_table_mutex); 139 if (inet_rcv_compat != NULL) 140 ret = inet_rcv_compat(skb, nlh); 141 else 142 ret = -EOPNOTSUPP; 143 mutex_unlock(&sock_diag_table_mutex); 144 145 return ret; 146 case SOCK_DIAG_BY_FAMILY: 147 return __sock_diag_rcv_msg(skb, nlh); 148 default: 149 return -EINVAL; 150 } 151 } 152 153 static DEFINE_MUTEX(sock_diag_mutex); 154 155 static void sock_diag_rcv(struct sk_buff *skb) 156 { 157 mutex_lock(&sock_diag_mutex); 158 netlink_rcv_skb(skb, &sock_diag_rcv_msg); 159 mutex_unlock(&sock_diag_mutex); 160 } 161 162 static int __net_init diag_net_init(struct net *net) 163 { 164 struct netlink_kernel_cfg cfg = { 165 .input = sock_diag_rcv, 166 }; 167 168 net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg); 169 return net->diag_nlsk == NULL ? -ENOMEM : 0; 170 } 171 172 static void __net_exit diag_net_exit(struct net *net) 173 { 174 netlink_kernel_release(net->diag_nlsk); 175 net->diag_nlsk = NULL; 176 } 177 178 static struct pernet_operations diag_net_ops = { 179 .init = diag_net_init, 180 .exit = diag_net_exit, 181 }; 182 183 static int __init sock_diag_init(void) 184 { 185 return register_pernet_subsys(&diag_net_ops); 186 } 187 188 static void __exit sock_diag_exit(void) 189 { 190 unregister_pernet_subsys(&diag_net_ops); 191 } 192 193 module_init(sock_diag_init); 194 module_exit(sock_diag_exit); 195 MODULE_LICENSE("GPL"); 196 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG); 197