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proc: prevent accessing /proc/<PID>/environ until it's ready
[deliverable/linux.git] / net / ipv6 / proc.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * This file implements the various access functions for the
7 * PROC file system. This is very similar to the IPv4 version,
8 * except it reports the sockets in the INET6 address family.
9 *
10 * Authors: David S. Miller (davem@caip.rutgers.edu)
11 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 */
18 #include <linux/socket.h>
19 #include <linux/net.h>
20 #include <linux/ipv6.h>
21 #include <linux/proc_fs.h>
22 #include <linux/seq_file.h>
23 #include <linux/stddef.h>
24 #include <linux/export.h>
25 #include <net/net_namespace.h>
26 #include <net/ip.h>
27 #include <net/sock.h>
28 #include <net/tcp.h>
29 #include <net/udp.h>
30 #include <net/transp_v6.h>
31 #include <net/ipv6.h>
32
33 static int sockstat6_seq_show(struct seq_file *seq, void *v)
34 {
35 struct net *net = seq->private;
36 unsigned int frag_mem = ip6_frag_mem(net);
37
38 seq_printf(seq, "TCP6: inuse %d\n",
39 sock_prot_inuse_get(net, &tcpv6_prot));
40 seq_printf(seq, "UDP6: inuse %d\n",
41 sock_prot_inuse_get(net, &udpv6_prot));
42 seq_printf(seq, "UDPLITE6: inuse %d\n",
43 sock_prot_inuse_get(net, &udplitev6_prot));
44 seq_printf(seq, "RAW6: inuse %d\n",
45 sock_prot_inuse_get(net, &rawv6_prot));
46 seq_printf(seq, "FRAG6: inuse %u memory %u\n", !!frag_mem, frag_mem);
47 return 0;
48 }
49
50 static int sockstat6_seq_open(struct inode *inode, struct file *file)
51 {
52 return single_open_net(inode, file, sockstat6_seq_show);
53 }
54
55 static const struct file_operations sockstat6_seq_fops = {
56 .owner = THIS_MODULE,
57 .open = sockstat6_seq_open,
58 .read = seq_read,
59 .llseek = seq_lseek,
60 .release = single_release_net,
61 };
62
63 static const struct snmp_mib snmp6_ipstats_list[] = {
64 /* ipv6 mib according to RFC 2465 */
65 SNMP_MIB_ITEM("Ip6InReceives", IPSTATS_MIB_INPKTS),
66 SNMP_MIB_ITEM("Ip6InHdrErrors", IPSTATS_MIB_INHDRERRORS),
67 SNMP_MIB_ITEM("Ip6InTooBigErrors", IPSTATS_MIB_INTOOBIGERRORS),
68 SNMP_MIB_ITEM("Ip6InNoRoutes", IPSTATS_MIB_INNOROUTES),
69 SNMP_MIB_ITEM("Ip6InAddrErrors", IPSTATS_MIB_INADDRERRORS),
70 SNMP_MIB_ITEM("Ip6InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
71 SNMP_MIB_ITEM("Ip6InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
72 SNMP_MIB_ITEM("Ip6InDiscards", IPSTATS_MIB_INDISCARDS),
73 SNMP_MIB_ITEM("Ip6InDelivers", IPSTATS_MIB_INDELIVERS),
74 SNMP_MIB_ITEM("Ip6OutForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
75 SNMP_MIB_ITEM("Ip6OutRequests", IPSTATS_MIB_OUTPKTS),
76 SNMP_MIB_ITEM("Ip6OutDiscards", IPSTATS_MIB_OUTDISCARDS),
77 SNMP_MIB_ITEM("Ip6OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
78 SNMP_MIB_ITEM("Ip6ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
79 SNMP_MIB_ITEM("Ip6ReasmReqds", IPSTATS_MIB_REASMREQDS),
80 SNMP_MIB_ITEM("Ip6ReasmOKs", IPSTATS_MIB_REASMOKS),
81 SNMP_MIB_ITEM("Ip6ReasmFails", IPSTATS_MIB_REASMFAILS),
82 SNMP_MIB_ITEM("Ip6FragOKs", IPSTATS_MIB_FRAGOKS),
83 SNMP_MIB_ITEM("Ip6FragFails", IPSTATS_MIB_FRAGFAILS),
84 SNMP_MIB_ITEM("Ip6FragCreates", IPSTATS_MIB_FRAGCREATES),
85 SNMP_MIB_ITEM("Ip6InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
86 SNMP_MIB_ITEM("Ip6OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
87 SNMP_MIB_ITEM("Ip6InOctets", IPSTATS_MIB_INOCTETS),
88 SNMP_MIB_ITEM("Ip6OutOctets", IPSTATS_MIB_OUTOCTETS),
89 SNMP_MIB_ITEM("Ip6InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
90 SNMP_MIB_ITEM("Ip6OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
91 SNMP_MIB_ITEM("Ip6InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
92 SNMP_MIB_ITEM("Ip6OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
93 /* IPSTATS_MIB_CSUMERRORS is not relevant in IPv6 (no checksum) */
94 SNMP_MIB_ITEM("Ip6InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
95 SNMP_MIB_ITEM("Ip6InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
96 SNMP_MIB_ITEM("Ip6InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
97 SNMP_MIB_ITEM("Ip6InCEPkts", IPSTATS_MIB_CEPKTS),
98 SNMP_MIB_SENTINEL
99 };
100
101 static const struct snmp_mib snmp6_icmp6_list[] = {
102 /* icmpv6 mib according to RFC 2466 */
103 SNMP_MIB_ITEM("Icmp6InMsgs", ICMP6_MIB_INMSGS),
104 SNMP_MIB_ITEM("Icmp6InErrors", ICMP6_MIB_INERRORS),
105 SNMP_MIB_ITEM("Icmp6OutMsgs", ICMP6_MIB_OUTMSGS),
106 SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS),
107 SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS),
108 SNMP_MIB_SENTINEL
109 };
110
111 /* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */
112 static const char *const icmp6type2name[256] = {
113 [ICMPV6_DEST_UNREACH] = "DestUnreachs",
114 [ICMPV6_PKT_TOOBIG] = "PktTooBigs",
115 [ICMPV6_TIME_EXCEED] = "TimeExcds",
116 [ICMPV6_PARAMPROB] = "ParmProblems",
117 [ICMPV6_ECHO_REQUEST] = "Echos",
118 [ICMPV6_ECHO_REPLY] = "EchoReplies",
119 [ICMPV6_MGM_QUERY] = "GroupMembQueries",
120 [ICMPV6_MGM_REPORT] = "GroupMembResponses",
121 [ICMPV6_MGM_REDUCTION] = "GroupMembReductions",
122 [ICMPV6_MLD2_REPORT] = "MLDv2Reports",
123 [NDISC_ROUTER_ADVERTISEMENT] = "RouterAdvertisements",
124 [NDISC_ROUTER_SOLICITATION] = "RouterSolicits",
125 [NDISC_NEIGHBOUR_ADVERTISEMENT] = "NeighborAdvertisements",
126 [NDISC_NEIGHBOUR_SOLICITATION] = "NeighborSolicits",
127 [NDISC_REDIRECT] = "Redirects",
128 };
129
130
131 static const struct snmp_mib snmp6_udp6_list[] = {
132 SNMP_MIB_ITEM("Udp6InDatagrams", UDP_MIB_INDATAGRAMS),
133 SNMP_MIB_ITEM("Udp6NoPorts", UDP_MIB_NOPORTS),
134 SNMP_MIB_ITEM("Udp6InErrors", UDP_MIB_INERRORS),
135 SNMP_MIB_ITEM("Udp6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
136 SNMP_MIB_ITEM("Udp6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
137 SNMP_MIB_ITEM("Udp6SndbufErrors", UDP_MIB_SNDBUFERRORS),
138 SNMP_MIB_ITEM("Udp6InCsumErrors", UDP_MIB_CSUMERRORS),
139 SNMP_MIB_ITEM("Udp6IgnoredMulti", UDP_MIB_IGNOREDMULTI),
140 SNMP_MIB_SENTINEL
141 };
142
143 static const struct snmp_mib snmp6_udplite6_list[] = {
144 SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS),
145 SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS),
146 SNMP_MIB_ITEM("UdpLite6InErrors", UDP_MIB_INERRORS),
147 SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
148 SNMP_MIB_ITEM("UdpLite6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
149 SNMP_MIB_ITEM("UdpLite6SndbufErrors", UDP_MIB_SNDBUFERRORS),
150 SNMP_MIB_ITEM("UdpLite6InCsumErrors", UDP_MIB_CSUMERRORS),
151 SNMP_MIB_SENTINEL
152 };
153
154 static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib)
155 {
156 char name[32];
157 int i;
158
159 /* print by name -- deprecated items */
160 for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
161 int icmptype;
162 const char *p;
163
164 icmptype = i & 0xff;
165 p = icmp6type2name[icmptype];
166 if (!p) /* don't print un-named types here */
167 continue;
168 snprintf(name, sizeof(name), "Icmp6%s%s",
169 i & 0x100 ? "Out" : "In", p);
170 seq_printf(seq, "%-32s\t%lu\n", name,
171 atomic_long_read(smib + i));
172 }
173
174 /* print by number (nonzero only) - ICMPMsgStat format */
175 for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
176 unsigned long val;
177
178 val = atomic_long_read(smib + i);
179 if (!val)
180 continue;
181 snprintf(name, sizeof(name), "Icmp6%sType%u",
182 i & 0x100 ? "Out" : "In", i & 0xff);
183 seq_printf(seq, "%-32s\t%lu\n", name, val);
184 }
185 }
186
187 /* can be called either with percpu mib (pcpumib != NULL),
188 * or shared one (smib != NULL)
189 */
190 static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib,
191 atomic_long_t *smib,
192 const struct snmp_mib *itemlist)
193 {
194 int i;
195 unsigned long val;
196
197 for (i = 0; itemlist[i].name; i++) {
198 val = pcpumib ?
199 snmp_fold_field(pcpumib, itemlist[i].entry) :
200 atomic_long_read(smib + itemlist[i].entry);
201 seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name, val);
202 }
203 }
204
205 static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib,
206 const struct snmp_mib *itemlist, size_t syncpoff)
207 {
208 int i;
209
210 for (i = 0; itemlist[i].name; i++)
211 seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name,
212 snmp_fold_field64(mib, itemlist[i].entry, syncpoff));
213 }
214
215 static int snmp6_seq_show(struct seq_file *seq, void *v)
216 {
217 struct net *net = (struct net *)seq->private;
218
219 snmp6_seq_show_item64(seq, net->mib.ipv6_statistics,
220 snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
221 snmp6_seq_show_item(seq, net->mib.icmpv6_statistics,
222 NULL, snmp6_icmp6_list);
223 snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs);
224 snmp6_seq_show_item(seq, net->mib.udp_stats_in6,
225 NULL, snmp6_udp6_list);
226 snmp6_seq_show_item(seq, net->mib.udplite_stats_in6,
227 NULL, snmp6_udplite6_list);
228 return 0;
229 }
230
231 static int snmp6_seq_open(struct inode *inode, struct file *file)
232 {
233 return single_open_net(inode, file, snmp6_seq_show);
234 }
235
236 static const struct file_operations snmp6_seq_fops = {
237 .owner = THIS_MODULE,
238 .open = snmp6_seq_open,
239 .read = seq_read,
240 .llseek = seq_lseek,
241 .release = single_release_net,
242 };
243
244 static int snmp6_dev_seq_show(struct seq_file *seq, void *v)
245 {
246 struct inet6_dev *idev = (struct inet6_dev *)seq->private;
247
248 seq_printf(seq, "%-32s\t%u\n", "ifIndex", idev->dev->ifindex);
249 snmp6_seq_show_item64(seq, idev->stats.ipv6,
250 snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
251 snmp6_seq_show_item(seq, NULL, idev->stats.icmpv6dev->mibs,
252 snmp6_icmp6_list);
253 snmp6_seq_show_icmpv6msg(seq, idev->stats.icmpv6msgdev->mibs);
254 return 0;
255 }
256
257 static int snmp6_dev_seq_open(struct inode *inode, struct file *file)
258 {
259 return single_open(file, snmp6_dev_seq_show, PDE_DATA(inode));
260 }
261
262 static const struct file_operations snmp6_dev_seq_fops = {
263 .owner = THIS_MODULE,
264 .open = snmp6_dev_seq_open,
265 .read = seq_read,
266 .llseek = seq_lseek,
267 .release = single_release,
268 };
269
270 int snmp6_register_dev(struct inet6_dev *idev)
271 {
272 struct proc_dir_entry *p;
273 struct net *net;
274
275 if (!idev || !idev->dev)
276 return -EINVAL;
277
278 net = dev_net(idev->dev);
279 if (!net->mib.proc_net_devsnmp6)
280 return -ENOENT;
281
282 p = proc_create_data(idev->dev->name, S_IRUGO,
283 net->mib.proc_net_devsnmp6,
284 &snmp6_dev_seq_fops, idev);
285 if (!p)
286 return -ENOMEM;
287
288 idev->stats.proc_dir_entry = p;
289 return 0;
290 }
291
292 int snmp6_unregister_dev(struct inet6_dev *idev)
293 {
294 struct net *net = dev_net(idev->dev);
295 if (!net->mib.proc_net_devsnmp6)
296 return -ENOENT;
297 if (!idev->stats.proc_dir_entry)
298 return -EINVAL;
299 proc_remove(idev->stats.proc_dir_entry);
300 idev->stats.proc_dir_entry = NULL;
301 return 0;
302 }
303
304 static int __net_init ipv6_proc_init_net(struct net *net)
305 {
306 if (!proc_create("sockstat6", S_IRUGO, net->proc_net,
307 &sockstat6_seq_fops))
308 return -ENOMEM;
309
310 if (!proc_create("snmp6", S_IRUGO, net->proc_net, &snmp6_seq_fops))
311 goto proc_snmp6_fail;
312
313 net->mib.proc_net_devsnmp6 = proc_mkdir("dev_snmp6", net->proc_net);
314 if (!net->mib.proc_net_devsnmp6)
315 goto proc_dev_snmp6_fail;
316 return 0;
317
318 proc_dev_snmp6_fail:
319 remove_proc_entry("snmp6", net->proc_net);
320 proc_snmp6_fail:
321 remove_proc_entry("sockstat6", net->proc_net);
322 return -ENOMEM;
323 }
324
325 static void __net_exit ipv6_proc_exit_net(struct net *net)
326 {
327 remove_proc_entry("sockstat6", net->proc_net);
328 remove_proc_entry("dev_snmp6", net->proc_net);
329 remove_proc_entry("snmp6", net->proc_net);
330 }
331
332 static struct pernet_operations ipv6_proc_ops = {
333 .init = ipv6_proc_init_net,
334 .exit = ipv6_proc_exit_net,
335 };
336
337 int __init ipv6_misc_proc_init(void)
338 {
339 return register_pernet_subsys(&ipv6_proc_ops);
340 }
341
342 void ipv6_misc_proc_exit(void)
343 {
344 unregister_pernet_subsys(&ipv6_proc_ops);
345 }
346
Linux kernel - Deliverables
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