include/linux/sunrpc/addr.h

   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
  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
  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
  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
  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)
  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
  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) */
  96 static inline bool rpc_cmp_addr6(const struct sockaddr *sap1,
  97                                    const struct sockaddr *sap2)
  98 {
  99         return false;
 100 }
 101
 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  */
 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_cmp_addr_port - compare the address and port number of two sockaddrs.
 135  * @sap1: first sockaddr
 136  * @sap2: second sockaddr
 137  */
 138 static inline bool rpc_cmp_addr_port(const struct sockaddr *sap1,
 139                                      const struct sockaddr *sap2)
 140 {
 141         if (!rpc_cmp_addr(sap1, sap2))
 142                 return false;
 143         return rpc_get_port(sap1) == rpc_get_port(sap2);
 144 }
 145
 146 /**
 147  * rpc_copy_addr - copy the address portion of one sockaddr to another
 148  * @dst: destination sockaddr
 149  * @src: source sockaddr
 150  *
 151  * Just copies the address portion and family. Ignores port, scope, etc.
 152  * Caller is responsible for making certain that dst is large enough to hold
 153  * the address in src. Returns true if address family is supported. Returns
 154  * false otherwise.
 155  */
 156 static inline bool rpc_copy_addr(struct sockaddr *dst,
 157                                  const struct sockaddr *src)
 158 {
 159         switch (src->sa_family) {
 160         case AF_INET:
 161                 return __rpc_copy_addr4(dst, src);
 162         case AF_INET6:
 163                 return __rpc_copy_addr6(dst, src);
 164         }
 165         return false;
 166 }
 167
 168 /**
 169  * rpc_get_scope_id - return scopeid for a given sockaddr
 170  * @sa: sockaddr to get scopeid from
 171  *
 172  * Returns the value of the sin6_scope_id for AF_INET6 addrs, or 0 if
 173  * not an AF_INET6 address.
 174  */
 175 static inline u32 rpc_get_scope_id(const struct sockaddr *sa)
 176 {
 177         if (sa->sa_family != AF_INET6)
 178                 return 0;
 179
 180         return ((struct sockaddr_in6 *) sa)->sin6_scope_id;
 181 }
 182
 183 #endif /* _LINUX_SUNRPC_ADDR_H */