include/linux/sunrpc/addr.h

   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
  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
  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
  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
  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)
  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
  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) */
  97 static inline bool rpc_cmp_addr6(const struct sockaddr *sap1,
  98                                    const struct sockaddr *sap2)
  99 {
 100         return false;
 101 }
 102
 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  */
 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  */
 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  */
 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  */
 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 */