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