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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2009, Oracle. All rights reserved.
4 *
5 * Convert socket addresses to presentation addresses and universal
6 * addresses, and vice versa.
7 *
8 * Universal addresses are introduced by RFC 1833 and further refined by
9 * recent RFCs describing NFSv4. The universal address format is part
10 * of the external (network) interface provided by rpcbind version 3
11 * and 4, and by NFSv4. Such an address is a string containing a
12 * presentation format IP address followed by a port number in
13 * "hibyte.lobyte" format.
14 *
15 * IPv6 addresses can also include a scope ID, typically denoted by
16 * a '%' followed by a device name or a non-negative integer. Refer to
17 * RFC 4291, Section 2.2 for details on IPv6 presentation formats.
18 */
19
20#include <net/ipv6.h>
21#include <linux/sunrpc/addr.h>
22#include <linux/sunrpc/msg_prot.h>
23#include <linux/slab.h>
24#include <linux/export.h>
25
26#if IS_ENABLED(CONFIG_IPV6)
27
28static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
29 char *buf, const int buflen)
30{
31 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
32 const struct in6_addr *addr = &sin6->sin6_addr;
33
34 /*
35 * RFC 4291, Section 2.2.2
36 *
37 * Shorthanded ANY address
38 */
39 if (ipv6_addr_any(addr))
40 return snprintf(buf, buflen, "::");
41
42 /*
43 * RFC 4291, Section 2.2.2
44 *
45 * Shorthanded loopback address
46 */
47 if (ipv6_addr_loopback(addr))
48 return snprintf(buf, buflen, "::1");
49
50 /*
51 * RFC 4291, Section 2.2.3
52 *
53 * Special presentation address format for mapped v4
54 * addresses.
55 */
56 if (ipv6_addr_v4mapped(addr))
57 return snprintf(buf, buflen, "::ffff:%pI4",
58 &addr->s6_addr32[3]);
59
60 /*
61 * RFC 4291, Section 2.2.1
62 */
63 return snprintf(buf, buflen, "%pI6c", addr);
64}
65
66static size_t rpc_ntop6(const struct sockaddr *sap,
67 char *buf, const size_t buflen)
68{
69 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
70 char scopebuf[IPV6_SCOPE_ID_LEN];
71 size_t len;
72 int rc;
73
74 len = rpc_ntop6_noscopeid(sap, buf, buflen);
75 if (unlikely(len == 0))
76 return len;
77
78 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
79 return len;
80 if (sin6->sin6_scope_id == 0)
81 return len;
82
83 rc = snprintf(scopebuf, sizeof(scopebuf), "%c%u",
84 IPV6_SCOPE_DELIMITER, sin6->sin6_scope_id);
85 if (unlikely((size_t)rc > sizeof(scopebuf)))
86 return 0;
87
88 len += rc;
89 if (unlikely(len > buflen))
90 return 0;
91
92 strcat(buf, scopebuf);
93 return len;
94}
95
96#else /* !IS_ENABLED(CONFIG_IPV6) */
97
98static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
99 char *buf, const int buflen)
100{
101 return 0;
102}
103
104static size_t rpc_ntop6(const struct sockaddr *sap,
105 char *buf, const size_t buflen)
106{
107 return 0;
108}
109
110#endif /* !IS_ENABLED(CONFIG_IPV6) */
111
112static int rpc_ntop4(const struct sockaddr *sap,
113 char *buf, const size_t buflen)
114{
115 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
116
117 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
118}
119
120/**
121 * rpc_ntop - construct a presentation address in @buf
122 * @sap: socket address
123 * @buf: construction area
124 * @buflen: size of @buf, in bytes
125 *
126 * Plants a %NUL-terminated string in @buf and returns the length
127 * of the string, excluding the %NUL. Otherwise zero is returned.
128 */
129size_t rpc_ntop(const struct sockaddr *sap, char *buf, const size_t buflen)
130{
131 switch (sap->sa_family) {
132 case AF_INET:
133 return rpc_ntop4(sap, buf, buflen);
134 case AF_INET6:
135 return rpc_ntop6(sap, buf, buflen);
136 }
137
138 return 0;
139}
140EXPORT_SYMBOL_GPL(rpc_ntop);
141
142static size_t rpc_pton4(const char *buf, const size_t buflen,
143 struct sockaddr *sap, const size_t salen)
144{
145 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
146 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
147
148 if (buflen > INET_ADDRSTRLEN || salen < sizeof(struct sockaddr_in))
149 return 0;
150
151 memset(sap, 0, sizeof(struct sockaddr_in));
152
153 if (in4_pton(buf, buflen, addr, '\0', NULL) == 0)
154 return 0;
155
156 sin->sin_family = AF_INET;
157 return sizeof(struct sockaddr_in);
158}
159
160#if IS_ENABLED(CONFIG_IPV6)
161static int rpc_parse_scope_id(struct net *net, const char *buf,
162 const size_t buflen, const char *delim,
163 struct sockaddr_in6 *sin6)
164{
165 char *p;
166 size_t len;
167
168 if ((buf + buflen) == delim)
169 return 1;
170
171 if (*delim != IPV6_SCOPE_DELIMITER)
172 return 0;
173
174 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
175 return 0;
176
177 len = (buf + buflen) - delim - 1;
178 p = kstrndup(delim + 1, len, GFP_KERNEL);
179 if (p) {
180 u32 scope_id = 0;
181 struct net_device *dev;
182
183 dev = dev_get_by_name(net, p);
184 if (dev != NULL) {
185 scope_id = dev->ifindex;
186 dev_put(dev);
187 } else {
188 if (kstrtou32(p, 10, &scope_id) == 0) {
189 kfree(p);
190 return 0;
191 }
192 }
193
194 kfree(p);
195
196 sin6->sin6_scope_id = scope_id;
197 return 1;
198 }
199
200 return 0;
201}
202
203static size_t rpc_pton6(struct net *net, const char *buf, const size_t buflen,
204 struct sockaddr *sap, const size_t salen)
205{
206 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
207 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
208 const char *delim;
209
210 if (buflen > (INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN) ||
211 salen < sizeof(struct sockaddr_in6))
212 return 0;
213
214 memset(sap, 0, sizeof(struct sockaddr_in6));
215
216 if (in6_pton(buf, buflen, addr, IPV6_SCOPE_DELIMITER, &delim) == 0)
217 return 0;
218
219 if (!rpc_parse_scope_id(net, buf, buflen, delim, sin6))
220 return 0;
221
222 sin6->sin6_family = AF_INET6;
223 return sizeof(struct sockaddr_in6);
224}
225#else
226static size_t rpc_pton6(struct net *net, const char *buf, const size_t buflen,
227 struct sockaddr *sap, const size_t salen)
228{
229 return 0;
230}
231#endif
232
233/**
234 * rpc_pton - Construct a sockaddr in @sap
235 * @net: applicable network namespace
236 * @buf: C string containing presentation format IP address
237 * @buflen: length of presentation address in bytes
238 * @sap: buffer into which to plant socket address
239 * @salen: size of buffer in bytes
240 *
241 * Returns the size of the socket address if successful; otherwise
242 * zero is returned.
243 *
244 * Plants a socket address in @sap and returns the size of the
245 * socket address, if successful. Returns zero if an error
246 * occurred.
247 */
248size_t rpc_pton(struct net *net, const char *buf, const size_t buflen,
249 struct sockaddr *sap, const size_t salen)
250{
251 unsigned int i;
252
253 for (i = 0; i < buflen; i++)
254 if (buf[i] == ':')
255 return rpc_pton6(net, buf, buflen, sap, salen);
256 return rpc_pton4(buf, buflen, sap, salen);
257}
258EXPORT_SYMBOL_GPL(rpc_pton);
259
260/**
261 * rpc_sockaddr2uaddr - Construct a universal address string from @sap.
262 * @sap: socket address
263 * @gfp_flags: allocation mode
264 *
265 * Returns a %NUL-terminated string in dynamically allocated memory;
266 * otherwise NULL is returned if an error occurred. Caller must
267 * free the returned string.
268 */
269char *rpc_sockaddr2uaddr(const struct sockaddr *sap, gfp_t gfp_flags)
270{
271 char portbuf[RPCBIND_MAXUADDRPLEN];
272 char addrbuf[RPCBIND_MAXUADDRLEN];
273 unsigned short port;
274
275 switch (sap->sa_family) {
276 case AF_INET:
277 if (rpc_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
278 return NULL;
279 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
280 break;
281 case AF_INET6:
282 if (rpc_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
283 return NULL;
284 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
285 break;
286 default:
287 return NULL;
288 }
289
290 if (snprintf(portbuf, sizeof(portbuf),
291 ".%u.%u", port >> 8, port & 0xff) > (int)sizeof(portbuf))
292 return NULL;
293
294 if (strlcat(addrbuf, portbuf, sizeof(addrbuf)) > sizeof(addrbuf))
295 return NULL;
296
297 return kstrdup(addrbuf, gfp_flags);
298}
299
300/**
301 * rpc_uaddr2sockaddr - convert a universal address to a socket address.
302 * @net: applicable network namespace
303 * @uaddr: C string containing universal address to convert
304 * @uaddr_len: length of universal address string
305 * @sap: buffer into which to plant socket address
306 * @salen: size of buffer
307 *
308 * @uaddr does not have to be '\0'-terminated, but kstrtou8() and
309 * rpc_pton() require proper string termination to be successful.
310 *
311 * Returns the size of the socket address if successful; otherwise
312 * zero is returned.
313 */
314size_t rpc_uaddr2sockaddr(struct net *net, const char *uaddr,
315 const size_t uaddr_len, struct sockaddr *sap,
316 const size_t salen)
317{
318 char *c, buf[RPCBIND_MAXUADDRLEN + sizeof('\0')];
319 u8 portlo, porthi;
320 unsigned short port;
321
322 if (uaddr_len > RPCBIND_MAXUADDRLEN)
323 return 0;
324
325 memcpy(buf, uaddr, uaddr_len);
326
327 buf[uaddr_len] = '\0';
328 c = strrchr(buf, '.');
329 if (unlikely(c == NULL))
330 return 0;
331 if (unlikely(kstrtou8(c + 1, 10, &portlo) != 0))
332 return 0;
333
334 *c = '\0';
335 c = strrchr(buf, '.');
336 if (unlikely(c == NULL))
337 return 0;
338 if (unlikely(kstrtou8(c + 1, 10, &porthi) != 0))
339 return 0;
340
341 port = (unsigned short)((porthi << 8) | portlo);
342
343 *c = '\0';
344 if (rpc_pton(net, buf, strlen(buf), sap, salen) == 0)
345 return 0;
346
347 switch (sap->sa_family) {
348 case AF_INET:
349 ((struct sockaddr_in *)sap)->sin_port = htons(port);
350 return sizeof(struct sockaddr_in);
351 case AF_INET6:
352 ((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
353 return sizeof(struct sockaddr_in6);
354 }
355
356 return 0;
357}
358EXPORT_SYMBOL_GPL(rpc_uaddr2sockaddr);
1/*
2 * Copyright 2009, Oracle. All rights reserved.
3 *
4 * Convert socket addresses to presentation addresses and universal
5 * addresses, and vice versa.
6 *
7 * Universal addresses are introduced by RFC 1833 and further refined by
8 * recent RFCs describing NFSv4. The universal address format is part
9 * of the external (network) interface provided by rpcbind version 3
10 * and 4, and by NFSv4. Such an address is a string containing a
11 * presentation format IP address followed by a port number in
12 * "hibyte.lobyte" format.
13 *
14 * IPv6 addresses can also include a scope ID, typically denoted by
15 * a '%' followed by a device name or a non-negative integer. Refer to
16 * RFC 4291, Section 2.2 for details on IPv6 presentation formats.
17 */
18
19#include <net/ipv6.h>
20#include <linux/sunrpc/addr.h>
21#include <linux/sunrpc/msg_prot.h>
22#include <linux/slab.h>
23#include <linux/export.h>
24
25#if IS_ENABLED(CONFIG_IPV6)
26
27static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
28 char *buf, const int buflen)
29{
30 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
31 const struct in6_addr *addr = &sin6->sin6_addr;
32
33 /*
34 * RFC 4291, Section 2.2.2
35 *
36 * Shorthanded ANY address
37 */
38 if (ipv6_addr_any(addr))
39 return snprintf(buf, buflen, "::");
40
41 /*
42 * RFC 4291, Section 2.2.2
43 *
44 * Shorthanded loopback address
45 */
46 if (ipv6_addr_loopback(addr))
47 return snprintf(buf, buflen, "::1");
48
49 /*
50 * RFC 4291, Section 2.2.3
51 *
52 * Special presentation address format for mapped v4
53 * addresses.
54 */
55 if (ipv6_addr_v4mapped(addr))
56 return snprintf(buf, buflen, "::ffff:%pI4",
57 &addr->s6_addr32[3]);
58
59 /*
60 * RFC 4291, Section 2.2.1
61 */
62 return snprintf(buf, buflen, "%pI6c", addr);
63}
64
65static size_t rpc_ntop6(const struct sockaddr *sap,
66 char *buf, const size_t buflen)
67{
68 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
69 char scopebuf[IPV6_SCOPE_ID_LEN];
70 size_t len;
71 int rc;
72
73 len = rpc_ntop6_noscopeid(sap, buf, buflen);
74 if (unlikely(len == 0))
75 return len;
76
77 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
78 return len;
79 if (sin6->sin6_scope_id == 0)
80 return len;
81
82 rc = snprintf(scopebuf, sizeof(scopebuf), "%c%u",
83 IPV6_SCOPE_DELIMITER, sin6->sin6_scope_id);
84 if (unlikely((size_t)rc > sizeof(scopebuf)))
85 return 0;
86
87 len += rc;
88 if (unlikely(len > buflen))
89 return 0;
90
91 strcat(buf, scopebuf);
92 return len;
93}
94
95#else /* !IS_ENABLED(CONFIG_IPV6) */
96
97static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
98 char *buf, const int buflen)
99{
100 return 0;
101}
102
103static size_t rpc_ntop6(const struct sockaddr *sap,
104 char *buf, const size_t buflen)
105{
106 return 0;
107}
108
109#endif /* !IS_ENABLED(CONFIG_IPV6) */
110
111static int rpc_ntop4(const struct sockaddr *sap,
112 char *buf, const size_t buflen)
113{
114 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
115
116 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
117}
118
119/**
120 * rpc_ntop - construct a presentation address in @buf
121 * @sap: socket address
122 * @buf: construction area
123 * @buflen: size of @buf, in bytes
124 *
125 * Plants a %NUL-terminated string in @buf and returns the length
126 * of the string, excluding the %NUL. Otherwise zero is returned.
127 */
128size_t rpc_ntop(const struct sockaddr *sap, char *buf, const size_t buflen)
129{
130 switch (sap->sa_family) {
131 case AF_INET:
132 return rpc_ntop4(sap, buf, buflen);
133 case AF_INET6:
134 return rpc_ntop6(sap, buf, buflen);
135 }
136
137 return 0;
138}
139EXPORT_SYMBOL_GPL(rpc_ntop);
140
141static size_t rpc_pton4(const char *buf, const size_t buflen,
142 struct sockaddr *sap, const size_t salen)
143{
144 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
145 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
146
147 if (buflen > INET_ADDRSTRLEN || salen < sizeof(struct sockaddr_in))
148 return 0;
149
150 memset(sap, 0, sizeof(struct sockaddr_in));
151
152 if (in4_pton(buf, buflen, addr, '\0', NULL) == 0)
153 return 0;
154
155 sin->sin_family = AF_INET;
156 return sizeof(struct sockaddr_in);
157}
158
159#if IS_ENABLED(CONFIG_IPV6)
160static int rpc_parse_scope_id(struct net *net, const char *buf,
161 const size_t buflen, const char *delim,
162 struct sockaddr_in6 *sin6)
163{
164 char *p;
165 size_t len;
166
167 if ((buf + buflen) == delim)
168 return 1;
169
170 if (*delim != IPV6_SCOPE_DELIMITER)
171 return 0;
172
173 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
174 return 0;
175
176 len = (buf + buflen) - delim - 1;
177 p = kstrndup(delim + 1, len, GFP_KERNEL);
178 if (p) {
179 u32 scope_id = 0;
180 struct net_device *dev;
181
182 dev = dev_get_by_name(net, p);
183 if (dev != NULL) {
184 scope_id = dev->ifindex;
185 dev_put(dev);
186 } else {
187 if (kstrtou32(p, 10, &scope_id) == 0) {
188 kfree(p);
189 return 0;
190 }
191 }
192
193 kfree(p);
194
195 sin6->sin6_scope_id = scope_id;
196 return 1;
197 }
198
199 return 0;
200}
201
202static size_t rpc_pton6(struct net *net, const char *buf, const size_t buflen,
203 struct sockaddr *sap, const size_t salen)
204{
205 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
206 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
207 const char *delim;
208
209 if (buflen > (INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN) ||
210 salen < sizeof(struct sockaddr_in6))
211 return 0;
212
213 memset(sap, 0, sizeof(struct sockaddr_in6));
214
215 if (in6_pton(buf, buflen, addr, IPV6_SCOPE_DELIMITER, &delim) == 0)
216 return 0;
217
218 if (!rpc_parse_scope_id(net, buf, buflen, delim, sin6))
219 return 0;
220
221 sin6->sin6_family = AF_INET6;
222 return sizeof(struct sockaddr_in6);
223}
224#else
225static size_t rpc_pton6(struct net *net, const char *buf, const size_t buflen,
226 struct sockaddr *sap, const size_t salen)
227{
228 return 0;
229}
230#endif
231
232/**
233 * rpc_pton - Construct a sockaddr in @sap
234 * @net: applicable network namespace
235 * @buf: C string containing presentation format IP address
236 * @buflen: length of presentation address in bytes
237 * @sap: buffer into which to plant socket address
238 * @salen: size of buffer in bytes
239 *
240 * Returns the size of the socket address if successful; otherwise
241 * zero is returned.
242 *
243 * Plants a socket address in @sap and returns the size of the
244 * socket address, if successful. Returns zero if an error
245 * occurred.
246 */
247size_t rpc_pton(struct net *net, const char *buf, const size_t buflen,
248 struct sockaddr *sap, const size_t salen)
249{
250 unsigned int i;
251
252 for (i = 0; i < buflen; i++)
253 if (buf[i] == ':')
254 return rpc_pton6(net, buf, buflen, sap, salen);
255 return rpc_pton4(buf, buflen, sap, salen);
256}
257EXPORT_SYMBOL_GPL(rpc_pton);
258
259/**
260 * rpc_sockaddr2uaddr - Construct a universal address string from @sap.
261 * @sap: socket address
262 * @gfp_flags: allocation mode
263 *
264 * Returns a %NUL-terminated string in dynamically allocated memory;
265 * otherwise NULL is returned if an error occurred. Caller must
266 * free the returned string.
267 */
268char *rpc_sockaddr2uaddr(const struct sockaddr *sap, gfp_t gfp_flags)
269{
270 char portbuf[RPCBIND_MAXUADDRPLEN];
271 char addrbuf[RPCBIND_MAXUADDRLEN];
272 unsigned short port;
273
274 switch (sap->sa_family) {
275 case AF_INET:
276 if (rpc_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
277 return NULL;
278 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
279 break;
280 case AF_INET6:
281 if (rpc_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
282 return NULL;
283 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
284 break;
285 default:
286 return NULL;
287 }
288
289 if (snprintf(portbuf, sizeof(portbuf),
290 ".%u.%u", port >> 8, port & 0xff) > (int)sizeof(portbuf))
291 return NULL;
292
293 if (strlcat(addrbuf, portbuf, sizeof(addrbuf)) > sizeof(addrbuf))
294 return NULL;
295
296 return kstrdup(addrbuf, gfp_flags);
297}
298
299/**
300 * rpc_uaddr2sockaddr - convert a universal address to a socket address.
301 * @net: applicable network namespace
302 * @uaddr: C string containing universal address to convert
303 * @uaddr_len: length of universal address string
304 * @sap: buffer into which to plant socket address
305 * @salen: size of buffer
306 *
307 * @uaddr does not have to be '\0'-terminated, but kstrtou8() and
308 * rpc_pton() require proper string termination to be successful.
309 *
310 * Returns the size of the socket address if successful; otherwise
311 * zero is returned.
312 */
313size_t rpc_uaddr2sockaddr(struct net *net, const char *uaddr,
314 const size_t uaddr_len, struct sockaddr *sap,
315 const size_t salen)
316{
317 char *c, buf[RPCBIND_MAXUADDRLEN + sizeof('\0')];
318 u8 portlo, porthi;
319 unsigned short port;
320
321 if (uaddr_len > RPCBIND_MAXUADDRLEN)
322 return 0;
323
324 memcpy(buf, uaddr, uaddr_len);
325
326 buf[uaddr_len] = '\0';
327 c = strrchr(buf, '.');
328 if (unlikely(c == NULL))
329 return 0;
330 if (unlikely(kstrtou8(c + 1, 10, &portlo) != 0))
331 return 0;
332
333 *c = '\0';
334 c = strrchr(buf, '.');
335 if (unlikely(c == NULL))
336 return 0;
337 if (unlikely(kstrtou8(c + 1, 10, &porthi) != 0))
338 return 0;
339
340 port = (unsigned short)((porthi << 8) | portlo);
341
342 *c = '\0';
343 if (rpc_pton(net, buf, strlen(buf), sap, salen) == 0)
344 return 0;
345
346 switch (sap->sa_family) {
347 case AF_INET:
348 ((struct sockaddr_in *)sap)->sin_port = htons(port);
349 return sizeof(struct sockaddr_in);
350 case AF_INET6:
351 ((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
352 return sizeof(struct sockaddr_in6);
353 }
354
355 return 0;
356}
357EXPORT_SYMBOL_GPL(rpc_uaddr2sockaddr);