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 15size_t rpc_ntop(const struct sockaddr *, char *, const size_t); 16size_t rpc_pton(struct net *, const char *, const size_t, 17 struct sockaddr *, const size_t); 18char * rpc_sockaddr2uaddr(const struct sockaddr *, gfp_t); 19size_t rpc_uaddr2sockaddr(struct net *, const char *, const size_t, 20 struct sockaddr *, const size_t); 21 22static 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 33static 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 49static 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 58static 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) 70static 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 84static 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) */ 96static inline bool __rpc_cmp_addr6(const struct sockaddr *sap1, 97 const struct sockaddr *sap2) 98{ 99 return false; 100} 101 102static 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 */ 119static 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 */ 143static 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 */ 162static 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