proc.c

  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_OUTREQUESTS),
 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_ITEM("Ip6OutTransmits", IPSTATS_MIB_OUTPKTS),
 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/* ICMP6_MIB_RATELIMITHOST needs to be last, see snmp6_dev_seq_show(). */
 98	SNMP_MIB_ITEM("Icmp6OutRateLimitHost", ICMP6_MIB_RATELIMITHOST),
 99};
100
101static const struct snmp_mib snmp6_udp6_list[] = {
102	SNMP_MIB_ITEM("Udp6InDatagrams", UDP_MIB_INDATAGRAMS),
103	SNMP_MIB_ITEM("Udp6NoPorts", UDP_MIB_NOPORTS),
104	SNMP_MIB_ITEM("Udp6InErrors", UDP_MIB_INERRORS),
105	SNMP_MIB_ITEM("Udp6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
106	SNMP_MIB_ITEM("Udp6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
107	SNMP_MIB_ITEM("Udp6SndbufErrors", UDP_MIB_SNDBUFERRORS),
108	SNMP_MIB_ITEM("Udp6InCsumErrors", UDP_MIB_CSUMERRORS),
109	SNMP_MIB_ITEM("Udp6IgnoredMulti", UDP_MIB_IGNOREDMULTI),
110	SNMP_MIB_ITEM("Udp6MemErrors", UDP_MIB_MEMERRORS),
111};
112
113static const struct snmp_mib snmp6_udplite6_list[] = {
114	SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS),
115	SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS),
116	SNMP_MIB_ITEM("UdpLite6InErrors", UDP_MIB_INERRORS),
117	SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
118	SNMP_MIB_ITEM("UdpLite6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
119	SNMP_MIB_ITEM("UdpLite6SndbufErrors", UDP_MIB_SNDBUFERRORS),
120	SNMP_MIB_ITEM("UdpLite6InCsumErrors", UDP_MIB_CSUMERRORS),
121	SNMP_MIB_ITEM("UdpLite6MemErrors", UDP_MIB_MEMERRORS),
122};
123
124static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib)
125{
126	char name[32];
127	int i;
128
129	/* print by name -- deprecated items */
130	for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
131		const char *p = NULL;
132		int icmptype;
133
134#define CASE(TYP, STR) case TYP: p = STR; break;
135
136		icmptype = i & 0xff;
137		switch (icmptype) {
138/* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */
139		CASE(ICMPV6_DEST_UNREACH,	"DestUnreachs")
140		CASE(ICMPV6_PKT_TOOBIG,		"PktTooBigs")
141		CASE(ICMPV6_TIME_EXCEED,	"TimeExcds")
142		CASE(ICMPV6_PARAMPROB,		"ParmProblems")
143		CASE(ICMPV6_ECHO_REQUEST,	"Echos")
144		CASE(ICMPV6_ECHO_REPLY,		"EchoReplies")
145		CASE(ICMPV6_MGM_QUERY,		"GroupMembQueries")
146		CASE(ICMPV6_MGM_REPORT,		"GroupMembResponses")
147		CASE(ICMPV6_MGM_REDUCTION,	"GroupMembReductions")
148		CASE(ICMPV6_MLD2_REPORT,	"MLDv2Reports")
149		CASE(NDISC_ROUTER_ADVERTISEMENT, "RouterAdvertisements")
150		CASE(NDISC_ROUTER_SOLICITATION, "RouterSolicits")
151		CASE(NDISC_NEIGHBOUR_ADVERTISEMENT, "NeighborAdvertisements")
152		CASE(NDISC_NEIGHBOUR_SOLICITATION, "NeighborSolicits")
153		CASE(NDISC_REDIRECT,		"Redirects")
154		}
155#undef CASE
156		if (!p)	/* don't print un-named types here */
157			continue;
158		snprintf(name, sizeof(name), "Icmp6%s%s",
159			i & 0x100 ? "Out" : "In", p);
160		seq_printf(seq, "%-32s\t%lu\n", name,
161			   atomic_long_read(smib + i));
162	}
163
164	/* print by number (nonzero only) - ICMPMsgStat format */
165	for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
166		unsigned long val;
167
168		val = atomic_long_read(smib + i);
169		if (!val)
170			continue;
171		snprintf(name, sizeof(name), "Icmp6%sType%u",
172			i & 0x100 ?  "Out" : "In", i & 0xff);
173		seq_printf(seq, "%-32s\t%lu\n", name, val);
174	}
175}
176
177/* can be called either with percpu mib (pcpumib != NULL),
178 * or shared one (smib != NULL)
179 */
180static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib,
181				atomic_long_t *smib,
182				const struct snmp_mib *itemlist,
183				int cnt)
184{
185	unsigned long buff[SNMP_MIB_MAX];
186	int i;
187
188	if (pcpumib) {
189		memset(buff, 0, sizeof(unsigned long) * cnt);
190
191		snmp_get_cpu_field_batch_cnt(buff, itemlist, cnt, pcpumib);
192		for (i = 0; i < cnt; i++)
193			seq_printf(seq, "%-32s\t%lu\n",
194				   itemlist[i].name, buff[i]);
195	} else {
196		for (i = 0; i < cnt; i++)
197			seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name,
198				   atomic_long_read(smib + itemlist[i].entry));
199	}
200}
201
202static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib,
203				  const struct snmp_mib *itemlist,
204				  int cnt, size_t syncpoff)
205{
206	u64 buff64[SNMP_MIB_MAX];
207	int i;
208
209	memset(buff64, 0, sizeof(u64) * cnt);
210
211	snmp_get_cpu_field64_batch_cnt(buff64, itemlist, cnt, mib, syncpoff);
212	for (i = 0; i < cnt; i++)
213		seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name, buff64[i]);
214}
215
216static int snmp6_seq_show(struct seq_file *seq, void *v)
217{
218	struct net *net = (struct net *)seq->private;
219
220	snmp6_seq_show_item64(seq, net->mib.ipv6_statistics,
221			      snmp6_ipstats_list,
222			      ARRAY_SIZE(snmp6_ipstats_list),
223			      offsetof(struct ipstats_mib, syncp));
224	snmp6_seq_show_item(seq, net->mib.icmpv6_statistics,
225			    NULL, snmp6_icmp6_list,
226			    ARRAY_SIZE(snmp6_icmp6_list));
227	snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs);
228	snmp6_seq_show_item(seq, net->mib.udp_stats_in6,
229			    NULL, snmp6_udp6_list,
230			    ARRAY_SIZE(snmp6_udp6_list));
231	snmp6_seq_show_item(seq, net->mib.udplite_stats_in6,
232			    NULL, snmp6_udplite6_list,
233			    ARRAY_SIZE(snmp6_udplite6_list));
234	return 0;
235}
236
237static int snmp6_dev_seq_show(struct seq_file *seq, void *v)
238{
239	struct inet6_dev *idev = (struct inet6_dev *)seq->private;
240
241	seq_printf(seq, "%-32s\t%u\n", "ifIndex", idev->dev->ifindex);
242	snmp6_seq_show_item64(seq, idev->stats.ipv6,
243			      snmp6_ipstats_list,
244			      ARRAY_SIZE(snmp6_ipstats_list),
245			      offsetof(struct ipstats_mib, syncp));
246
247	/* Per idev icmp stats do not have ICMP6_MIB_RATELIMITHOST */
248	snmp6_seq_show_item(seq, NULL, idev->stats.icmpv6dev->mibs,
249			    snmp6_icmp6_list, ARRAY_SIZE(snmp6_icmp6_list) - 1);
250
251	snmp6_seq_show_icmpv6msg(seq, idev->stats.icmpv6msgdev->mibs);
252	return 0;
253}
254
255int snmp6_register_dev(struct inet6_dev *idev)
256{
257	struct proc_dir_entry *p;
258	struct net *net;
259
260	if (!idev || !idev->dev)
261		return -EINVAL;
262
263	net = dev_net(idev->dev);
264	if (!net->mib.proc_net_devsnmp6)
265		return -ENOENT;
266
267	p = proc_create_single_data(idev->dev->name, 0444,
268			net->mib.proc_net_devsnmp6, snmp6_dev_seq_show, idev);
269	if (!p)
270		return -ENOMEM;
271
272	idev->stats.proc_dir_entry = p;
273	return 0;
274}
275
276int snmp6_unregister_dev(struct inet6_dev *idev)
277{
278	struct net *net = dev_net(idev->dev);
279	if (!net->mib.proc_net_devsnmp6)
280		return -ENOENT;
281	if (!idev->stats.proc_dir_entry)
282		return -EINVAL;
283	proc_remove(idev->stats.proc_dir_entry);
284	idev->stats.proc_dir_entry = NULL;
285	return 0;
286}
287
288static int __net_init ipv6_proc_init_net(struct net *net)
289{
290	if (!proc_create_net_single("sockstat6", 0444, net->proc_net,
291			sockstat6_seq_show, NULL))
292		return -ENOMEM;
293
294	if (!proc_create_net_single("snmp6", 0444, net->proc_net,
295			snmp6_seq_show, NULL))
296		goto proc_snmp6_fail;
297
298	net->mib.proc_net_devsnmp6 = proc_mkdir("dev_snmp6", net->proc_net);
299	if (!net->mib.proc_net_devsnmp6)
300		goto proc_dev_snmp6_fail;
301	return 0;
302
303proc_dev_snmp6_fail:
304	remove_proc_entry("snmp6", net->proc_net);
305proc_snmp6_fail:
306	remove_proc_entry("sockstat6", net->proc_net);
307	return -ENOMEM;
308}
309
310static void __net_exit ipv6_proc_exit_net(struct net *net)
311{
312	remove_proc_entry("sockstat6", net->proc_net);
313	remove_proc_entry("dev_snmp6", net->proc_net);
314	remove_proc_entry("snmp6", net->proc_net);
315}
316
317static struct pernet_operations ipv6_proc_ops = {
318	.init = ipv6_proc_init_net,
319	.exit = ipv6_proc_exit_net,
320};
321
322int __init ipv6_misc_proc_init(void)
323{
324	return register_pernet_subsys(&ipv6_proc_ops);
325}
326
327void ipv6_misc_proc_exit(void)
328{
329	unregister_pernet_subsys(&ipv6_proc_ops);
330}