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 */ 184