xref: /openbmc/linux/net/ipv6/proc.c (revision 56712f74)
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 
sockstat6_seq_show(struct seq_file * seq,void * v)34 static 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 
52 static 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 	SNMP_MIB_SENTINEL
89 };
90 
91 static const struct snmp_mib snmp6_icmp6_list[] = {
92 /* icmpv6 mib according to RFC 2466 */
93 	SNMP_MIB_ITEM("Icmp6InMsgs", ICMP6_MIB_INMSGS),
94 	SNMP_MIB_ITEM("Icmp6InErrors", ICMP6_MIB_INERRORS),
95 	SNMP_MIB_ITEM("Icmp6OutMsgs", ICMP6_MIB_OUTMSGS),
96 	SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS),
97 	SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS),
98 	SNMP_MIB_ITEM("Icmp6OutRateLimitHost", ICMP6_MIB_RATELIMITHOST),
99 	SNMP_MIB_SENTINEL
100 };
101 
102 /* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */
103 static const char *const icmp6type2name[256] = {
104 	[ICMPV6_DEST_UNREACH] = "DestUnreachs",
105 	[ICMPV6_PKT_TOOBIG] = "PktTooBigs",
106 	[ICMPV6_TIME_EXCEED] = "TimeExcds",
107 	[ICMPV6_PARAMPROB] = "ParmProblems",
108 	[ICMPV6_ECHO_REQUEST] = "Echos",
109 	[ICMPV6_ECHO_REPLY] = "EchoReplies",
110 	[ICMPV6_MGM_QUERY] = "GroupMembQueries",
111 	[ICMPV6_MGM_REPORT] = "GroupMembResponses",
112 	[ICMPV6_MGM_REDUCTION] = "GroupMembReductions",
113 	[ICMPV6_MLD2_REPORT] = "MLDv2Reports",
114 	[NDISC_ROUTER_ADVERTISEMENT] = "RouterAdvertisements",
115 	[NDISC_ROUTER_SOLICITATION] = "RouterSolicits",
116 	[NDISC_NEIGHBOUR_ADVERTISEMENT] = "NeighborAdvertisements",
117 	[NDISC_NEIGHBOUR_SOLICITATION] = "NeighborSolicits",
118 	[NDISC_REDIRECT] = "Redirects",
119 };
120 
121 
122 static const struct snmp_mib snmp6_udp6_list[] = {
123 	SNMP_MIB_ITEM("Udp6InDatagrams", UDP_MIB_INDATAGRAMS),
124 	SNMP_MIB_ITEM("Udp6NoPorts", UDP_MIB_NOPORTS),
125 	SNMP_MIB_ITEM("Udp6InErrors", UDP_MIB_INERRORS),
126 	SNMP_MIB_ITEM("Udp6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
127 	SNMP_MIB_ITEM("Udp6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
128 	SNMP_MIB_ITEM("Udp6SndbufErrors", UDP_MIB_SNDBUFERRORS),
129 	SNMP_MIB_ITEM("Udp6InCsumErrors", UDP_MIB_CSUMERRORS),
130 	SNMP_MIB_ITEM("Udp6IgnoredMulti", UDP_MIB_IGNOREDMULTI),
131 	SNMP_MIB_ITEM("Udp6MemErrors", UDP_MIB_MEMERRORS),
132 	SNMP_MIB_SENTINEL
133 };
134 
135 static const struct snmp_mib snmp6_udplite6_list[] = {
136 	SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS),
137 	SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS),
138 	SNMP_MIB_ITEM("UdpLite6InErrors", UDP_MIB_INERRORS),
139 	SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
140 	SNMP_MIB_ITEM("UdpLite6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
141 	SNMP_MIB_ITEM("UdpLite6SndbufErrors", UDP_MIB_SNDBUFERRORS),
142 	SNMP_MIB_ITEM("UdpLite6InCsumErrors", UDP_MIB_CSUMERRORS),
143 	SNMP_MIB_ITEM("UdpLite6MemErrors", UDP_MIB_MEMERRORS),
144 	SNMP_MIB_SENTINEL
145 };
146 
snmp6_seq_show_icmpv6msg(struct seq_file * seq,atomic_long_t * smib)147 static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib)
148 {
149 	char name[32];
150 	int i;
151 
152 	/* print by name -- deprecated items */
153 	for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
154 		int icmptype;
155 		const char *p;
156 
157 		icmptype = i & 0xff;
158 		p = icmp6type2name[icmptype];
159 		if (!p)	/* don't print un-named types here */
160 			continue;
161 		snprintf(name, sizeof(name), "Icmp6%s%s",
162 			i & 0x100 ? "Out" : "In", p);
163 		seq_printf(seq, "%-32s\t%lu\n", name,
164 			   atomic_long_read(smib + i));
165 	}
166 
167 	/* print by number (nonzero only) - ICMPMsgStat format */
168 	for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
169 		unsigned long val;
170 
171 		val = atomic_long_read(smib + i);
172 		if (!val)
173 			continue;
174 		snprintf(name, sizeof(name), "Icmp6%sType%u",
175 			i & 0x100 ?  "Out" : "In", i & 0xff);
176 		seq_printf(seq, "%-32s\t%lu\n", name, val);
177 	}
178 }
179 
180 /* can be called either with percpu mib (pcpumib != NULL),
181  * or shared one (smib != NULL)
182  */
snmp6_seq_show_item(struct seq_file * seq,void __percpu * pcpumib,atomic_long_t * smib,const struct snmp_mib * itemlist)183 static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib,
184 				atomic_long_t *smib,
185 				const struct snmp_mib *itemlist)
186 {
187 	unsigned long buff[SNMP_MIB_MAX];
188 	int i;
189 
190 	if (pcpumib) {
191 		memset(buff, 0, sizeof(unsigned long) * SNMP_MIB_MAX);
192 
193 		snmp_get_cpu_field_batch(buff, itemlist, pcpumib);
194 		for (i = 0; itemlist[i].name; i++)
195 			seq_printf(seq, "%-32s\t%lu\n",
196 				   itemlist[i].name, buff[i]);
197 	} else {
198 		for (i = 0; itemlist[i].name; i++)
199 			seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name,
200 				   atomic_long_read(smib + itemlist[i].entry));
201 	}
202 }
203 
snmp6_seq_show_item64(struct seq_file * seq,void __percpu * mib,const struct snmp_mib * itemlist,size_t syncpoff)204 static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib,
205 				  const struct snmp_mib *itemlist, size_t syncpoff)
206 {
207 	u64 buff64[SNMP_MIB_MAX];
208 	int i;
209 
210 	memset(buff64, 0, sizeof(u64) * SNMP_MIB_MAX);
211 
212 	snmp_get_cpu_field64_batch(buff64, itemlist, mib, syncpoff);
213 	for (i = 0; itemlist[i].name; i++)
214 		seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name, buff64[i]);
215 }
216 
snmp6_seq_show(struct seq_file * seq,void * v)217 static int snmp6_seq_show(struct seq_file *seq, void *v)
218 {
219 	struct net *net = (struct net *)seq->private;
220 
221 	snmp6_seq_show_item64(seq, net->mib.ipv6_statistics,
222 			    snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
223 	snmp6_seq_show_item(seq, net->mib.icmpv6_statistics,
224 			    NULL, snmp6_icmp6_list);
225 	snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs);
226 	snmp6_seq_show_item(seq, net->mib.udp_stats_in6,
227 			    NULL, snmp6_udp6_list);
228 	snmp6_seq_show_item(seq, net->mib.udplite_stats_in6,
229 			    NULL, snmp6_udplite6_list);
230 	return 0;
231 }
232 
snmp6_dev_seq_show(struct seq_file * seq,void * v)233 static int snmp6_dev_seq_show(struct seq_file *seq, void *v)
234 {
235 	struct inet6_dev *idev = (struct inet6_dev *)seq->private;
236 
237 	seq_printf(seq, "%-32s\t%u\n", "ifIndex", idev->dev->ifindex);
238 	snmp6_seq_show_item64(seq, idev->stats.ipv6,
239 			    snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
240 	snmp6_seq_show_item(seq, NULL, idev->stats.icmpv6dev->mibs,
241 			    snmp6_icmp6_list);
242 	snmp6_seq_show_icmpv6msg(seq, idev->stats.icmpv6msgdev->mibs);
243 	return 0;
244 }
245 
snmp6_register_dev(struct inet6_dev * idev)246 int snmp6_register_dev(struct inet6_dev *idev)
247 {
248 	struct proc_dir_entry *p;
249 	struct net *net;
250 
251 	if (!idev || !idev->dev)
252 		return -EINVAL;
253 
254 	net = dev_net(idev->dev);
255 	if (!net->mib.proc_net_devsnmp6)
256 		return -ENOENT;
257 
258 	p = proc_create_single_data(idev->dev->name, 0444,
259 			net->mib.proc_net_devsnmp6, snmp6_dev_seq_show, idev);
260 	if (!p)
261 		return -ENOMEM;
262 
263 	idev->stats.proc_dir_entry = p;
264 	return 0;
265 }
266 
snmp6_unregister_dev(struct inet6_dev * idev)267 int snmp6_unregister_dev(struct inet6_dev *idev)
268 {
269 	struct net *net = dev_net(idev->dev);
270 	if (!net->mib.proc_net_devsnmp6)
271 		return -ENOENT;
272 	if (!idev->stats.proc_dir_entry)
273 		return -EINVAL;
274 	proc_remove(idev->stats.proc_dir_entry);
275 	idev->stats.proc_dir_entry = NULL;
276 	return 0;
277 }
278 
ipv6_proc_init_net(struct net * net)279 static int __net_init ipv6_proc_init_net(struct net *net)
280 {
281 	if (!proc_create_net_single("sockstat6", 0444, net->proc_net,
282 			sockstat6_seq_show, NULL))
283 		return -ENOMEM;
284 
285 	if (!proc_create_net_single("snmp6", 0444, net->proc_net,
286 			snmp6_seq_show, NULL))
287 		goto proc_snmp6_fail;
288 
289 	net->mib.proc_net_devsnmp6 = proc_mkdir("dev_snmp6", net->proc_net);
290 	if (!net->mib.proc_net_devsnmp6)
291 		goto proc_dev_snmp6_fail;
292 	return 0;
293 
294 proc_dev_snmp6_fail:
295 	remove_proc_entry("snmp6", net->proc_net);
296 proc_snmp6_fail:
297 	remove_proc_entry("sockstat6", net->proc_net);
298 	return -ENOMEM;
299 }
300 
ipv6_proc_exit_net(struct net * net)301 static void __net_exit ipv6_proc_exit_net(struct net *net)
302 {
303 	remove_proc_entry("sockstat6", net->proc_net);
304 	remove_proc_entry("dev_snmp6", net->proc_net);
305 	remove_proc_entry("snmp6", net->proc_net);
306 }
307 
308 static struct pernet_operations ipv6_proc_ops = {
309 	.init = ipv6_proc_init_net,
310 	.exit = ipv6_proc_exit_net,
311 };
312 
ipv6_misc_proc_init(void)313 int __init ipv6_misc_proc_init(void)
314 {
315 	return register_pernet_subsys(&ipv6_proc_ops);
316 }
317 
ipv6_misc_proc_exit(void)318 void ipv6_misc_proc_exit(void)
319 {
320 	unregister_pernet_subsys(&ipv6_proc_ops);
321 }
322