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/net/ipv6/proc.c

http://github.com/mirrors/linux
C | 317 lines | 257 code | 38 blank | 22 comment | 18 complexity | fdc877008c14ee710844e550697fe08c MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * INET		An implementation of the TCP/IP protocol suite for the LINUX
  4 *		operating system.  INET is implemented using the  BSD Socket
  5 *		interface as the means of communication with the user level.
  6 *
  7 *		This file implements the various access functions for the
  8 *		PROC file system.  This is very similar to the IPv4 version,
  9 *		except it reports the sockets in the INET6 address family.
 10 *
 11 * Authors:	David S. Miller (davem@caip.rutgers.edu)
 12 *		YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
 13 */
 14#include <linux/socket.h>
 15#include <linux/net.h>
 16#include <linux/ipv6.h>
 17#include <linux/proc_fs.h>
 18#include <linux/seq_file.h>
 19#include <linux/stddef.h>
 20#include <linux/export.h>
 21#include <net/net_namespace.h>
 22#include <net/ip.h>
 23#include <net/sock.h>
 24#include <net/tcp.h>
 25#include <net/udp.h>
 26#include <net/transp_v6.h>
 27#include <net/ipv6.h>
 28
 29#define MAX4(a, b, c, d) \
 30	max_t(u32, max_t(u32, a, b), max_t(u32, c, d))
 31#define SNMP_MIB_MAX MAX4(UDP_MIB_MAX, TCP_MIB_MAX, \
 32			IPSTATS_MIB_MAX, ICMP_MIB_MAX)
 33
 34static int sockstat6_seq_show(struct seq_file *seq, void *v)
 35{
 36	struct net *net = seq->private;
 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 %lu\n",
 47		   atomic_read(&net->ipv6.fqdir->rhashtable.nelems),
 48		   frag_mem_limit(net->ipv6.fqdir));
 49	return 0;
 50}
 51
 52static const struct snmp_mib snmp6_ipstats_list[] = {
 53/* ipv6 mib according to RFC 2465 */
 54	SNMP_MIB_ITEM("Ip6InReceives", IPSTATS_MIB_INPKTS),
 55	SNMP_MIB_ITEM("Ip6InHdrErrors", IPSTATS_MIB_INHDRERRORS),
 56	SNMP_MIB_ITEM("Ip6InTooBigErrors", IPSTATS_MIB_INTOOBIGERRORS),
 57	SNMP_MIB_ITEM("Ip6InNoRoutes", IPSTATS_MIB_INNOROUTES),
 58	SNMP_MIB_ITEM("Ip6InAddrErrors", IPSTATS_MIB_INADDRERRORS),
 59	SNMP_MIB_ITEM("Ip6InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
 60	SNMP_MIB_ITEM("Ip6InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
 61	SNMP_MIB_ITEM("Ip6InDiscards", IPSTATS_MIB_INDISCARDS),
 62	SNMP_MIB_ITEM("Ip6InDelivers", IPSTATS_MIB_INDELIVERS),
 63	SNMP_MIB_ITEM("Ip6OutForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
 64	SNMP_MIB_ITEM("Ip6OutRequests", IPSTATS_MIB_OUTPKTS),
 65	SNMP_MIB_ITEM("Ip6OutDiscards", IPSTATS_MIB_OUTDISCARDS),
 66	SNMP_MIB_ITEM("Ip6OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
 67	SNMP_MIB_ITEM("Ip6ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
 68	SNMP_MIB_ITEM("Ip6ReasmReqds", IPSTATS_MIB_REASMREQDS),
 69	SNMP_MIB_ITEM("Ip6ReasmOKs", IPSTATS_MIB_REASMOKS),
 70	SNMP_MIB_ITEM("Ip6ReasmFails", IPSTATS_MIB_REASMFAILS),
 71	SNMP_MIB_ITEM("Ip6FragOKs", IPSTATS_MIB_FRAGOKS),
 72	SNMP_MIB_ITEM("Ip6FragFails", IPSTATS_MIB_FRAGFAILS),
 73	SNMP_MIB_ITEM("Ip6FragCreates", IPSTATS_MIB_FRAGCREATES),
 74	SNMP_MIB_ITEM("Ip6InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
 75	SNMP_MIB_ITEM("Ip6OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
 76	SNMP_MIB_ITEM("Ip6InOctets", IPSTATS_MIB_INOCTETS),
 77	SNMP_MIB_ITEM("Ip6OutOctets", IPSTATS_MIB_OUTOCTETS),
 78	SNMP_MIB_ITEM("Ip6InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
 79	SNMP_MIB_ITEM("Ip6OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
 80	SNMP_MIB_ITEM("Ip6InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
 81	SNMP_MIB_ITEM("Ip6OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
 82	/* IPSTATS_MIB_CSUMERRORS is not relevant in IPv6 (no checksum) */
 83	SNMP_MIB_ITEM("Ip6InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
 84	SNMP_MIB_ITEM("Ip6InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
 85	SNMP_MIB_ITEM("Ip6InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
 86	SNMP_MIB_ITEM("Ip6InCEPkts", IPSTATS_MIB_CEPKTS),
 87	SNMP_MIB_SENTINEL
 88};
 89
 90static const struct snmp_mib snmp6_icmp6_list[] = {
 91/* icmpv6 mib according to RFC 2466 */
 92	SNMP_MIB_ITEM("Icmp6InMsgs", ICMP6_MIB_INMSGS),
 93	SNMP_MIB_ITEM("Icmp6InErrors", ICMP6_MIB_INERRORS),
 94	SNMP_MIB_ITEM("Icmp6OutMsgs", ICMP6_MIB_OUTMSGS),
 95	SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS),
 96	SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS),
 97	SNMP_MIB_SENTINEL
 98};
 99
100/* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */
101static const char *const icmp6type2name[256] = {
102	[ICMPV6_DEST_UNREACH] = "DestUnreachs",
103	[ICMPV6_PKT_TOOBIG] = "PktTooBigs",
104	[ICMPV6_TIME_EXCEED] = "TimeExcds",
105	[ICMPV6_PARAMPROB] = "ParmProblems",
106	[ICMPV6_ECHO_REQUEST] = "Echos",
107	[ICMPV6_ECHO_REPLY] = "EchoReplies",
108	[ICMPV6_MGM_QUERY] = "GroupMembQueries",
109	[ICMPV6_MGM_REPORT] = "GroupMembResponses",
110	[ICMPV6_MGM_REDUCTION] = "GroupMembReductions",
111	[ICMPV6_MLD2_REPORT] = "MLDv2Reports",
112	[NDISC_ROUTER_ADVERTISEMENT] = "RouterAdvertisements",
113	[NDISC_ROUTER_SOLICITATION] = "RouterSolicits",
114	[NDISC_NEIGHBOUR_ADVERTISEMENT] = "NeighborAdvertisements",
115	[NDISC_NEIGHBOUR_SOLICITATION] = "NeighborSolicits",
116	[NDISC_REDIRECT] = "Redirects",
117};
118
119
120static const struct snmp_mib snmp6_udp6_list[] = {
121	SNMP_MIB_ITEM("Udp6InDatagrams", UDP_MIB_INDATAGRAMS),
122	SNMP_MIB_ITEM("Udp6NoPorts", UDP_MIB_NOPORTS),
123	SNMP_MIB_ITEM("Udp6InErrors", UDP_MIB_INERRORS),
124	SNMP_MIB_ITEM("Udp6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
125	SNMP_MIB_ITEM("Udp6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
126	SNMP_MIB_ITEM("Udp6SndbufErrors", UDP_MIB_SNDBUFERRORS),
127	SNMP_MIB_ITEM("Udp6InCsumErrors", UDP_MIB_CSUMERRORS),
128	SNMP_MIB_ITEM("Udp6IgnoredMulti", UDP_MIB_IGNOREDMULTI),
129	SNMP_MIB_SENTINEL
130};
131
132static const struct snmp_mib snmp6_udplite6_list[] = {
133	SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS),
134	SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS),
135	SNMP_MIB_ITEM("UdpLite6InErrors", UDP_MIB_INERRORS),
136	SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
137	SNMP_MIB_ITEM("UdpLite6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
138	SNMP_MIB_ITEM("UdpLite6SndbufErrors", UDP_MIB_SNDBUFERRORS),
139	SNMP_MIB_ITEM("UdpLite6InCsumErrors", UDP_MIB_CSUMERRORS),
140	SNMP_MIB_SENTINEL
141};
142
143static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib)
144{
145	char name[32];
146	int i;
147
148	/* print by name -- deprecated items */
149	for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
150		int icmptype;
151		const char *p;
152
153		icmptype = i & 0xff;
154		p = icmp6type2name[icmptype];
155		if (!p)	/* don't print un-named types here */
156			continue;
157		snprintf(name, sizeof(name), "Icmp6%s%s",
158			i & 0x100 ? "Out" : "In", p);
159		seq_printf(seq, "%-32s\t%lu\n", name,
160			   atomic_long_read(smib + i));
161	}
162
163	/* print by number (nonzero only) - ICMPMsgStat format */
164	for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
165		unsigned long val;
166
167		val = atomic_long_read(smib + i);
168		if (!val)
169			continue;
170		snprintf(name, sizeof(name), "Icmp6%sType%u",
171			i & 0x100 ?  "Out" : "In", i & 0xff);
172		seq_printf(seq, "%-32s\t%lu\n", name, val);
173	}
174}
175
176/* can be called either with percpu mib (pcpumib != NULL),
177 * or shared one (smib != NULL)
178 */
179static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib,
180				atomic_long_t *smib,
181				const struct snmp_mib *itemlist)
182{
183	unsigned long buff[SNMP_MIB_MAX];
184	int i;
185
186	if (pcpumib) {
187		memset(buff, 0, sizeof(unsigned long) * SNMP_MIB_MAX);
188
189		snmp_get_cpu_field_batch(buff, itemlist, pcpumib);
190		for (i = 0; itemlist[i].name; i++)
191			seq_printf(seq, "%-32s\t%lu\n",
192				   itemlist[i].name, buff[i]);
193	} else {
194		for (i = 0; itemlist[i].name; i++)
195			seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name,
196				   atomic_long_read(smib + itemlist[i].entry));
197	}
198}
199
200static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib,
201				  const struct snmp_mib *itemlist, size_t syncpoff)
202{
203	u64 buff64[SNMP_MIB_MAX];
204	int i;
205
206	memset(buff64, 0, sizeof(u64) * SNMP_MIB_MAX);
207
208	snmp_get_cpu_field64_batch(buff64, itemlist, mib, syncpoff);
209	for (i = 0; itemlist[i].name; i++)
210		seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name, buff64[i]);
211}
212
213static int snmp6_seq_show(struct seq_file *seq, void *v)
214{
215	struct net *net = (struct net *)seq->private;
216
217	snmp6_seq_show_item64(seq, net->mib.ipv6_statistics,
218			    snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
219	snmp6_seq_show_item(seq, net->mib.icmpv6_statistics,
220			    NULL, snmp6_icmp6_list);
221	snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs);
222	snmp6_seq_show_item(seq, net->mib.udp_stats_in6,
223			    NULL, snmp6_udp6_list);
224	snmp6_seq_show_item(seq, net->mib.udplite_stats_in6,
225			    NULL, snmp6_udplite6_list);
226	return 0;
227}
228
229static int snmp6_dev_seq_show(struct seq_file *seq, void *v)
230{
231	struct inet6_dev *idev = (struct inet6_dev *)seq->private;
232
233	seq_printf(seq, "%-32s\t%u\n", "ifIndex", idev->dev->ifindex);
234	snmp6_seq_show_item64(seq, idev->stats.ipv6,
235			    snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
236	snmp6_seq_show_item(seq, NULL, idev->stats.icmpv6dev->mibs,
237			    snmp6_icmp6_list);
238	snmp6_seq_show_icmpv6msg(seq, idev->stats.icmpv6msgdev->mibs);
239	return 0;
240}
241
242int snmp6_register_dev(struct inet6_dev *idev)
243{
244	struct proc_dir_entry *p;
245	struct net *net;
246
247	if (!idev || !idev->dev)
248		return -EINVAL;
249
250	net = dev_net(idev->dev);
251	if (!net->mib.proc_net_devsnmp6)
252		return -ENOENT;
253
254	p = proc_create_single_data(idev->dev->name, 0444,
255			net->mib.proc_net_devsnmp6, snmp6_dev_seq_show, idev);
256	if (!p)
257		return -ENOMEM;
258
259	idev->stats.proc_dir_entry = p;
260	return 0;
261}
262
263int snmp6_unregister_dev(struct inet6_dev *idev)
264{
265	struct net *net = dev_net(idev->dev);
266	if (!net->mib.proc_net_devsnmp6)
267		return -ENOENT;
268	if (!idev->stats.proc_dir_entry)
269		return -EINVAL;
270	proc_remove(idev->stats.proc_dir_entry);
271	idev->stats.proc_dir_entry = NULL;
272	return 0;
273}
274
275static int __net_init ipv6_proc_init_net(struct net *net)
276{
277	if (!proc_create_net_single("sockstat6", 0444, net->proc_net,
278			sockstat6_seq_show, NULL))
279		return -ENOMEM;
280
281	if (!proc_create_net_single("snmp6", 0444, net->proc_net,
282			snmp6_seq_show, NULL))
283		goto proc_snmp6_fail;
284
285	net->mib.proc_net_devsnmp6 = proc_mkdir("dev_snmp6", net->proc_net);
286	if (!net->mib.proc_net_devsnmp6)
287		goto proc_dev_snmp6_fail;
288	return 0;
289
290proc_dev_snmp6_fail:
291	remove_proc_entry("snmp6", net->proc_net);
292proc_snmp6_fail:
293	remove_proc_entry("sockstat6", net->proc_net);
294	return -ENOMEM;
295}
296
297static void __net_exit ipv6_proc_exit_net(struct net *net)
298{
299	remove_proc_entry("sockstat6", net->proc_net);
300	remove_proc_entry("dev_snmp6", net->proc_net);
301	remove_proc_entry("snmp6", net->proc_net);
302}
303
304static struct pernet_operations ipv6_proc_ops = {
305	.init = ipv6_proc_init_net,
306	.exit = ipv6_proc_exit_net,
307};
308
309int __init ipv6_misc_proc_init(void)
310{
311	return register_pernet_subsys(&ipv6_proc_ops);
312}
313
314void ipv6_misc_proc_exit(void)
315{
316	unregister_pernet_subsys(&ipv6_proc_ops);
317}