1 /*
2 * linux/include/linux/sunrpc/addr.h
3 *
4 * Various routines for copying and comparing sockaddrs and for
5 * converting them to and from presentation format.
6 */
7 #ifndef _LINUX_SUNRPC_ADDR_H
8 #define _LINUX_SUNRPC_ADDR_H
9
10 #include <linux/socket.h>
11 #include <linux/in.h>
12 #include <linux/in6.h>
13 #include <net/ipv6.h>
14
15 size_t rpc_ntop(const struct sockaddr *, char *, const size_t);
16 size_t rpc_pton(struct net *, const char *, const size_t,
17 struct sockaddr *, const size_t);
18 char * rpc_sockaddr2uaddr(const struct sockaddr *, gfp_t);
19 size_t rpc_uaddr2sockaddr(struct net *, const char *, const size_t,
20 struct sockaddr *, const size_t);
21
rpc_get_port(const struct sockaddr * sap)22 static inline unsigned short rpc_get_port(const struct sockaddr *sap)
23 {
24 switch (sap->sa_family) {
25 case AF_INET:
26 return ntohs(((struct sockaddr_in *)sap)->sin_port);
27 case AF_INET6:
28 return ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
29 }
30 return 0;
31 }
32
rpc_set_port(struct sockaddr * sap,const unsigned short port)33 static inline void rpc_set_port(struct sockaddr *sap,
34 const unsigned short port)
35 {
36 switch (sap->sa_family) {
37 case AF_INET:
38 ((struct sockaddr_in *)sap)->sin_port = htons(port);
39 break;
40 case AF_INET6:
41 ((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
42 break;
43 }
44 }
45
46 #define IPV6_SCOPE_DELIMITER '%'
47 #define IPV6_SCOPE_ID_LEN sizeof("%nnnnnnnnnn")
48
__rpc_cmp_addr4(const struct sockaddr * sap1,const struct sockaddr * sap2)49 static inline bool __rpc_cmp_addr4(const struct sockaddr *sap1,
50 const struct sockaddr *sap2)
51 {
52 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sap1;
53 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sap2;
54
55 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
56 }
57
__rpc_copy_addr4(struct sockaddr * dst,const struct sockaddr * src)58 static inline bool __rpc_copy_addr4(struct sockaddr *dst,
59 const struct sockaddr *src)
60 {
61 const struct sockaddr_in *ssin = (struct sockaddr_in *) src;
62 struct sockaddr_in *dsin = (struct sockaddr_in *) dst;
63
64 dsin->sin_family = ssin->sin_family;
65 dsin->sin_addr.s_addr = ssin->sin_addr.s_addr;
66 return true;
67 }
68
69 #if IS_ENABLED(CONFIG_IPV6)
__rpc_cmp_addr6(const struct sockaddr * sap1,const struct sockaddr * sap2)70 static inline bool __rpc_cmp_addr6(const struct sockaddr *sap1,
71 const struct sockaddr *sap2)
72 {
73 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sap1;
74 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sap2;
75
76 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
77 return false;
78 else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL)
79 return sin1->sin6_scope_id == sin2->sin6_scope_id;
80
81 return true;
82 }
83
__rpc_copy_addr6(struct sockaddr * dst,const struct sockaddr * src)84 static inline bool __rpc_copy_addr6(struct sockaddr *dst,
85 const struct sockaddr *src)
86 {
87 const struct sockaddr_in6 *ssin6 = (const struct sockaddr_in6 *) src;
88 struct sockaddr_in6 *dsin6 = (struct sockaddr_in6 *) dst;
89
90 dsin6->sin6_family = ssin6->sin6_family;
91 dsin6->sin6_addr = ssin6->sin6_addr;
92 dsin6->sin6_scope_id = ssin6->sin6_scope_id;
93 return true;
94 }
95 #else /* !(IS_ENABLED(CONFIG_IPV6) */
__rpc_cmp_addr6(const struct sockaddr * sap1,const struct sockaddr * sap2)96 static inline bool __rpc_cmp_addr6(const struct sockaddr *sap1,
97 const struct sockaddr *sap2)
98 {
99 return false;
100 }
101
__rpc_copy_addr6(struct sockaddr * dst,const struct sockaddr * src)102 static inline bool __rpc_copy_addr6(struct sockaddr *dst,
103 const struct sockaddr *src)
104 {
105 return false;
106 }
107 #endif /* !(IS_ENABLED(CONFIG_IPV6) */
108
109 /**
110 * rpc_cmp_addr - compare the address portion of two sockaddrs.
111 * @sap1: first sockaddr
112 * @sap2: second sockaddr
113 *
114 * Just compares the family and address portion. Ignores port, but
115 * compares the scope if it's a link-local address.
116 *
117 * Returns true if the addrs are equal, false if they aren't.
118 */
rpc_cmp_addr(const struct sockaddr * sap1,const struct sockaddr * sap2)119 static inline bool rpc_cmp_addr(const struct sockaddr *sap1,
120 const struct sockaddr *sap2)
121 {
122 if (sap1->sa_family == sap2->sa_family) {
123 switch (sap1->sa_family) {
124 case AF_INET:
125 return __rpc_cmp_addr4(sap1, sap2);
126 case AF_INET6:
127 return __rpc_cmp_addr6(sap1, sap2);
128 }
129 }
130 return false;
131 }
132
133 /**
134 * rpc_copy_addr - copy the address portion of one sockaddr to another
135 * @dst: destination sockaddr
136 * @src: source sockaddr
137 *
138 * Just copies the address portion and family. Ignores port, scope, etc.
139 * Caller is responsible for making certain that dst is large enough to hold
140 * the address in src. Returns true if address family is supported. Returns
141 * false otherwise.
142 */
rpc_copy_addr(struct sockaddr * dst,const struct sockaddr * src)143 static inline bool rpc_copy_addr(struct sockaddr *dst,
144 const struct sockaddr *src)
145 {
146 switch (src->sa_family) {
147 case AF_INET:
148 return __rpc_copy_addr4(dst, src);
149 case AF_INET6:
150 return __rpc_copy_addr6(dst, src);
151 }
152 return false;
153 }
154
155 /**
156 * rpc_get_scope_id - return scopeid for a given sockaddr
157 * @sa: sockaddr to get scopeid from
158 *
159 * Returns the value of the sin6_scope_id for AF_INET6 addrs, or 0 if
160 * not an AF_INET6 address.
161 */
rpc_get_scope_id(const struct sockaddr * sa)162 static inline u32 rpc_get_scope_id(const struct sockaddr *sa)
163 {
164 if (sa->sa_family != AF_INET6)
165 return 0;
166
167 return ((struct sockaddr_in6 *) sa)->sin6_scope_id;
168 }
169
170 #endif /* _LINUX_SUNRPC_ADDR_H */
171