1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * linux/include/linux/sunrpc/addr.h
4 *
5 * Various routines for copying and comparing sockaddrs and for
6 * converting them to and from presentation format.
7 */
8 #ifndef _LINUX_SUNRPC_ADDR_H
9 #define _LINUX_SUNRPC_ADDR_H
10
11 #include <linux/socket.h>
12 #include <linux/in.h>
13 #include <linux/in6.h>
14 #include <net/ipv6.h>
15
16 size_t rpc_ntop(const struct sockaddr *, char *, const size_t);
17 size_t rpc_pton(struct net *, const char *, const size_t,
18 struct sockaddr *, const size_t);
19 char * rpc_sockaddr2uaddr(const struct sockaddr *, gfp_t);
20 size_t rpc_uaddr2sockaddr(struct net *, const char *, const size_t,
21 struct sockaddr *, const size_t);
22
rpc_get_port(const struct sockaddr * sap)23 static inline unsigned short rpc_get_port(const struct sockaddr *sap)
24 {
25 switch (sap->sa_family) {
26 case AF_INET:
27 return ntohs(((struct sockaddr_in *)sap)->sin_port);
28 case AF_INET6:
29 return ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
30 }
31 return 0;
32 }
33
rpc_set_port(struct sockaddr * sap,const unsigned short port)34 static inline void rpc_set_port(struct sockaddr *sap,
35 const unsigned short port)
36 {
37 switch (sap->sa_family) {
38 case AF_INET:
39 ((struct sockaddr_in *)sap)->sin_port = htons(port);
40 break;
41 case AF_INET6:
42 ((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
43 break;
44 }
45 }
46
47 #define IPV6_SCOPE_DELIMITER '%'
48 #define IPV6_SCOPE_ID_LEN sizeof("%nnnnnnnnnn")
49
rpc_cmp_addr4(const struct sockaddr * sap1,const struct sockaddr * sap2)50 static inline bool rpc_cmp_addr4(const struct sockaddr *sap1,
51 const struct sockaddr *sap2)
52 {
53 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sap1;
54 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sap2;
55
56 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
57 }
58
__rpc_copy_addr4(struct sockaddr * dst,const struct sockaddr * src)59 static inline bool __rpc_copy_addr4(struct sockaddr *dst,
60 const struct sockaddr *src)
61 {
62 const struct sockaddr_in *ssin = (struct sockaddr_in *) src;
63 struct sockaddr_in *dsin = (struct sockaddr_in *) dst;
64
65 dsin->sin_family = ssin->sin_family;
66 dsin->sin_addr.s_addr = ssin->sin_addr.s_addr;
67 return true;
68 }
69
70 #if IS_ENABLED(CONFIG_IPV6)
rpc_cmp_addr6(const struct sockaddr * sap1,const struct sockaddr * sap2)71 static inline bool rpc_cmp_addr6(const struct sockaddr *sap1,
72 const struct sockaddr *sap2)
73 {
74 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sap1;
75 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sap2;
76
77 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
78 return false;
79 else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL)
80 return sin1->sin6_scope_id == sin2->sin6_scope_id;
81
82 return true;
83 }
84
__rpc_copy_addr6(struct sockaddr * dst,const struct sockaddr * src)85 static inline bool __rpc_copy_addr6(struct sockaddr *dst,
86 const struct sockaddr *src)
87 {
88 const struct sockaddr_in6 *ssin6 = (const struct sockaddr_in6 *) src;
89 struct sockaddr_in6 *dsin6 = (struct sockaddr_in6 *) dst;
90
91 dsin6->sin6_family = ssin6->sin6_family;
92 dsin6->sin6_addr = ssin6->sin6_addr;
93 dsin6->sin6_scope_id = ssin6->sin6_scope_id;
94 return true;
95 }
96 #else /* !(IS_ENABLED(CONFIG_IPV6) */
rpc_cmp_addr6(const struct sockaddr * sap1,const struct sockaddr * sap2)97 static inline bool rpc_cmp_addr6(const struct sockaddr *sap1,
98 const struct sockaddr *sap2)
99 {
100 return false;
101 }
102
__rpc_copy_addr6(struct sockaddr * dst,const struct sockaddr * src)103 static inline bool __rpc_copy_addr6(struct sockaddr *dst,
104 const struct sockaddr *src)
105 {
106 return false;
107 }
108 #endif /* !(IS_ENABLED(CONFIG_IPV6) */
109
110 /**
111 * rpc_cmp_addr - compare the address portion of two sockaddrs.
112 * @sap1: first sockaddr
113 * @sap2: second sockaddr
114 *
115 * Just compares the family and address portion. Ignores port, but
116 * compares the scope if it's a link-local address.
117 *
118 * Returns true if the addrs are equal, false if they aren't.
119 */
rpc_cmp_addr(const struct sockaddr * sap1,const struct sockaddr * sap2)120 static inline bool rpc_cmp_addr(const struct sockaddr *sap1,
121 const struct sockaddr *sap2)
122 {
123 if (sap1->sa_family == sap2->sa_family) {
124 switch (sap1->sa_family) {
125 case AF_INET:
126 return rpc_cmp_addr4(sap1, sap2);
127 case AF_INET6:
128 return rpc_cmp_addr6(sap1, sap2);
129 }
130 }
131 return false;
132 }
133
134 /**
135 * rpc_cmp_addr_port - compare the address and port number of two sockaddrs.
136 * @sap1: first sockaddr
137 * @sap2: second sockaddr
138 */
rpc_cmp_addr_port(const struct sockaddr * sap1,const struct sockaddr * sap2)139 static inline bool rpc_cmp_addr_port(const struct sockaddr *sap1,
140 const struct sockaddr *sap2)
141 {
142 if (!rpc_cmp_addr(sap1, sap2))
143 return false;
144 return rpc_get_port(sap1) == rpc_get_port(sap2);
145 }
146
147 /**
148 * rpc_copy_addr - copy the address portion of one sockaddr to another
149 * @dst: destination sockaddr
150 * @src: source sockaddr
151 *
152 * Just copies the address portion and family. Ignores port, scope, etc.
153 * Caller is responsible for making certain that dst is large enough to hold
154 * the address in src. Returns true if address family is supported. Returns
155 * false otherwise.
156 */
rpc_copy_addr(struct sockaddr * dst,const struct sockaddr * src)157 static inline bool rpc_copy_addr(struct sockaddr *dst,
158 const struct sockaddr *src)
159 {
160 switch (src->sa_family) {
161 case AF_INET:
162 return __rpc_copy_addr4(dst, src);
163 case AF_INET6:
164 return __rpc_copy_addr6(dst, src);
165 }
166 return false;
167 }
168
169 /**
170 * rpc_get_scope_id - return scopeid for a given sockaddr
171 * @sa: sockaddr to get scopeid from
172 *
173 * Returns the value of the sin6_scope_id for AF_INET6 addrs, or 0 if
174 * not an AF_INET6 address.
175 */
rpc_get_scope_id(const struct sockaddr * sa)176 static inline u32 rpc_get_scope_id(const struct sockaddr *sa)
177 {
178 if (sa->sa_family != AF_INET6)
179 return 0;
180
181 return ((struct sockaddr_in6 *) sa)->sin6_scope_id;
182 }
183
184 #endif /* _LINUX_SUNRPC_ADDR_H */
185