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TOMOYO Linux Cross Reference
Linux/net/core/sock_diag.c

Version: ~ [ linux-5.12-rc7 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /* License: GPL */
  2 
  3 #include <linux/mutex.h>
  4 #include <linux/socket.h>
  5 #include <linux/skbuff.h>
  6 #include <net/netlink.h>
  7 #include <net/net_namespace.h>
  8 #include <linux/module.h>
  9 #include <net/sock.h>
 10 #include <linux/kernel.h>
 11 #include <linux/tcp.h>
 12 #include <linux/workqueue.h>
 13 
 14 #include <linux/inet_diag.h>
 15 #include <linux/sock_diag.h>
 16 
 17 static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
 18 static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh);
 19 static DEFINE_MUTEX(sock_diag_table_mutex);
 20 static struct workqueue_struct *broadcast_wq;
 21 
 22 u64 sock_gen_cookie(struct sock *sk)
 23 {
 24         while (1) {
 25                 u64 res = atomic64_read(&sk->sk_cookie);
 26 
 27                 if (res)
 28                         return res;
 29                 res = atomic64_inc_return(&sock_net(sk)->cookie_gen);
 30                 atomic64_cmpxchg(&sk->sk_cookie, 0, res);
 31         }
 32 }
 33 
 34 int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie)
 35 {
 36         u64 res;
 37 
 38         if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE)
 39                 return 0;
 40 
 41         res = sock_gen_cookie(sk);
 42         if ((u32)res != cookie[0] || (u32)(res >> 32) != cookie[1])
 43                 return -ESTALE;
 44 
 45         return 0;
 46 }
 47 EXPORT_SYMBOL_GPL(sock_diag_check_cookie);
 48 
 49 void sock_diag_save_cookie(struct sock *sk, __u32 *cookie)
 50 {
 51         u64 res = sock_gen_cookie(sk);
 52 
 53         cookie[0] = (u32)res;
 54         cookie[1] = (u32)(res >> 32);
 55 }
 56 EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
 57 
 58 int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype)
 59 {
 60         u32 mem[SK_MEMINFO_VARS];
 61 
 62         sk_get_meminfo(sk, mem);
 63 
 64         return nla_put(skb, attrtype, sizeof(mem), &mem);
 65 }
 66 EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
 67 
 68 int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
 69                              struct sk_buff *skb, int attrtype)
 70 {
 71         struct sock_fprog_kern *fprog;
 72         struct sk_filter *filter;
 73         struct nlattr *attr;
 74         unsigned int flen;
 75         int err = 0;
 76 
 77         if (!may_report_filterinfo) {
 78                 nla_reserve(skb, attrtype, 0);
 79                 return 0;
 80         }
 81 
 82         rcu_read_lock();
 83         filter = rcu_dereference(sk->sk_filter);
 84         if (!filter)
 85                 goto out;
 86 
 87         fprog = filter->prog->orig_prog;
 88         if (!fprog)
 89                 goto out;
 90 
 91         flen = bpf_classic_proglen(fprog);
 92 
 93         attr = nla_reserve(skb, attrtype, flen);
 94         if (attr == NULL) {
 95                 err = -EMSGSIZE;
 96                 goto out;
 97         }
 98 
 99         memcpy(nla_data(attr), fprog->filter, flen);
100 out:
101         rcu_read_unlock();
102         return err;
103 }
104 EXPORT_SYMBOL(sock_diag_put_filterinfo);
105 
106 struct broadcast_sk {
107         struct sock *sk;
108         struct work_struct work;
109 };
110 
111 static size_t sock_diag_nlmsg_size(void)
112 {
113         return NLMSG_ALIGN(sizeof(struct inet_diag_msg)
114                + nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */
115                + nla_total_size_64bit(sizeof(struct tcp_info))); /* INET_DIAG_INFO */
116 }
117 
118 static void sock_diag_broadcast_destroy_work(struct work_struct *work)
119 {
120         struct broadcast_sk *bsk =
121                 container_of(work, struct broadcast_sk, work);
122         struct sock *sk = bsk->sk;
123         const struct sock_diag_handler *hndl;
124         struct sk_buff *skb;
125         const enum sknetlink_groups group = sock_diag_destroy_group(sk);
126         int err = -1;
127 
128         WARN_ON(group == SKNLGRP_NONE);
129 
130         skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL);
131         if (!skb)
132                 goto out;
133 
134         mutex_lock(&sock_diag_table_mutex);
135         hndl = sock_diag_handlers[sk->sk_family];
136         if (hndl && hndl->get_info)
137                 err = hndl->get_info(skb, sk);
138         mutex_unlock(&sock_diag_table_mutex);
139 
140         if (!err)
141                 nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group,
142                                 GFP_KERNEL);
143         else
144                 kfree_skb(skb);
145 out:
146         sk_destruct(sk);
147         kfree(bsk);
148 }
149 
150 void sock_diag_broadcast_destroy(struct sock *sk)
151 {
152         /* Note, this function is often called from an interrupt context. */
153         struct broadcast_sk *bsk =
154                 kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC);
155         if (!bsk)
156                 return sk_destruct(sk);
157         bsk->sk = sk;
158         INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work);
159         queue_work(broadcast_wq, &bsk->work);
160 }
161 
162 void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
163 {
164         mutex_lock(&sock_diag_table_mutex);
165         inet_rcv_compat = fn;
166         mutex_unlock(&sock_diag_table_mutex);
167 }
168 EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
169 
170 void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
171 {
172         mutex_lock(&sock_diag_table_mutex);
173         inet_rcv_compat = NULL;
174         mutex_unlock(&sock_diag_table_mutex);
175 }
176 EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
177 
178 int sock_diag_register(const struct sock_diag_handler *hndl)
179 {
180         int err = 0;
181 
182         if (hndl->family >= AF_MAX)
183                 return -EINVAL;
184 
185         mutex_lock(&sock_diag_table_mutex);
186         if (sock_diag_handlers[hndl->family])
187                 err = -EBUSY;
188         else
189                 sock_diag_handlers[hndl->family] = hndl;
190         mutex_unlock(&sock_diag_table_mutex);
191 
192         return err;
193 }
194 EXPORT_SYMBOL_GPL(sock_diag_register);
195 
196 void sock_diag_unregister(const struct sock_diag_handler *hnld)
197 {
198         int family = hnld->family;
199 
200         if (family >= AF_MAX)
201                 return;
202 
203         mutex_lock(&sock_diag_table_mutex);
204         BUG_ON(sock_diag_handlers[family] != hnld);
205         sock_diag_handlers[family] = NULL;
206         mutex_unlock(&sock_diag_table_mutex);
207 }
208 EXPORT_SYMBOL_GPL(sock_diag_unregister);
209 
210 static int __sock_diag_cmd(struct sk_buff *skb, struct nlmsghdr *nlh)
211 {
212         int err;
213         struct sock_diag_req *req = nlmsg_data(nlh);
214         const struct sock_diag_handler *hndl;
215 
216         if (nlmsg_len(nlh) < sizeof(*req))
217                 return -EINVAL;
218 
219         if (req->sdiag_family >= AF_MAX)
220                 return -EINVAL;
221 
222         if (sock_diag_handlers[req->sdiag_family] == NULL)
223                 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
224                                 NETLINK_SOCK_DIAG, req->sdiag_family);
225 
226         mutex_lock(&sock_diag_table_mutex);
227         hndl = sock_diag_handlers[req->sdiag_family];
228         if (hndl == NULL)
229                 err = -ENOENT;
230         else if (nlh->nlmsg_type == SOCK_DIAG_BY_FAMILY)
231                 err = hndl->dump(skb, nlh);
232         else if (nlh->nlmsg_type == SOCK_DESTROY && hndl->destroy)
233                 err = hndl->destroy(skb, nlh);
234         else
235                 err = -EOPNOTSUPP;
236         mutex_unlock(&sock_diag_table_mutex);
237 
238         return err;
239 }
240 
241 static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
242                              struct netlink_ext_ack *extack)
243 {
244         int ret;
245 
246         switch (nlh->nlmsg_type) {
247         case TCPDIAG_GETSOCK:
248         case DCCPDIAG_GETSOCK:
249                 if (inet_rcv_compat == NULL)
250                         request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
251                                         NETLINK_SOCK_DIAG, AF_INET);
252 
253                 mutex_lock(&sock_diag_table_mutex);
254                 if (inet_rcv_compat != NULL)
255                         ret = inet_rcv_compat(skb, nlh);
256                 else
257                         ret = -EOPNOTSUPP;
258                 mutex_unlock(&sock_diag_table_mutex);
259 
260                 return ret;
261         case SOCK_DIAG_BY_FAMILY:
262         case SOCK_DESTROY:
263                 return __sock_diag_cmd(skb, nlh);
264         default:
265                 return -EINVAL;
266         }
267 }
268 
269 static DEFINE_MUTEX(sock_diag_mutex);
270 
271 static void sock_diag_rcv(struct sk_buff *skb)
272 {
273         mutex_lock(&sock_diag_mutex);
274         netlink_rcv_skb(skb, &sock_diag_rcv_msg);
275         mutex_unlock(&sock_diag_mutex);
276 }
277 
278 static int sock_diag_bind(struct net *net, int group)
279 {
280         switch (group) {
281         case SKNLGRP_INET_TCP_DESTROY:
282         case SKNLGRP_INET_UDP_DESTROY:
283                 if (!sock_diag_handlers[AF_INET])
284                         request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
285                                        NETLINK_SOCK_DIAG, AF_INET);
286                 break;
287         case SKNLGRP_INET6_TCP_DESTROY:
288         case SKNLGRP_INET6_UDP_DESTROY:
289                 if (!sock_diag_handlers[AF_INET6])
290                         request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
291                                        NETLINK_SOCK_DIAG, AF_INET);
292                 break;
293         }
294         return 0;
295 }
296 
297 int sock_diag_destroy(struct sock *sk, int err)
298 {
299         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
300                 return -EPERM;
301 
302         if (!sk->sk_prot->diag_destroy)
303                 return -EOPNOTSUPP;
304 
305         return sk->sk_prot->diag_destroy(sk, err);
306 }
307 EXPORT_SYMBOL_GPL(sock_diag_destroy);
308 
309 static int __net_init diag_net_init(struct net *net)
310 {
311         struct netlink_kernel_cfg cfg = {
312                 .groups = SKNLGRP_MAX,
313                 .input  = sock_diag_rcv,
314                 .bind   = sock_diag_bind,
315                 .flags  = NL_CFG_F_NONROOT_RECV,
316         };
317 
318         net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
319         return net->diag_nlsk == NULL ? -ENOMEM : 0;
320 }
321 
322 static void __net_exit diag_net_exit(struct net *net)
323 {
324         netlink_kernel_release(net->diag_nlsk);
325         net->diag_nlsk = NULL;
326 }
327 
328 static struct pernet_operations diag_net_ops = {
329         .init = diag_net_init,
330         .exit = diag_net_exit,
331 };
332 
333 static int __init sock_diag_init(void)
334 {
335         broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0);
336         BUG_ON(!broadcast_wq);
337         return register_pernet_subsys(&diag_net_ops);
338 }
339 device_initcall(sock_diag_init);
340 

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