356 lines
8.7 KiB
C
356 lines
8.7 KiB
C
/*
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* Copyright 2009, Oracle. All rights reserved.
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*
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* Convert socket addresses to presentation addresses and universal
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* addresses, and vice versa.
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*
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* Universal addresses are introduced by RFC 1833 and further refined by
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* recent RFCs describing NFSv4. The universal address format is part
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* of the external (network) interface provided by rpcbind version 3
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* and 4, and by NFSv4. Such an address is a string containing a
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* presentation format IP address followed by a port number in
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* "hibyte.lobyte" format.
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*
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* IPv6 addresses can also include a scope ID, typically denoted by
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* a '%' followed by a device name or a non-negative integer. Refer to
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* RFC 4291, Section 2.2 for details on IPv6 presentation formats.
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*/
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#include <net/ipv6.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/slab.h>
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
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char *buf, const int buflen)
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{
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const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
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const struct in6_addr *addr = &sin6->sin6_addr;
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/*
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* RFC 4291, Section 2.2.2
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*
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* Shorthanded ANY address
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*/
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if (ipv6_addr_any(addr))
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return snprintf(buf, buflen, "::");
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/*
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* RFC 4291, Section 2.2.2
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*
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* Shorthanded loopback address
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*/
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if (ipv6_addr_loopback(addr))
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return snprintf(buf, buflen, "::1");
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/*
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* RFC 4291, Section 2.2.3
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*
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* Special presentation address format for mapped v4
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* addresses.
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*/
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if (ipv6_addr_v4mapped(addr))
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return snprintf(buf, buflen, "::ffff:%pI4",
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&addr->s6_addr32[3]);
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/*
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* RFC 4291, Section 2.2.1
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*/
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return snprintf(buf, buflen, "%pI6c", addr);
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}
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static size_t rpc_ntop6(const struct sockaddr *sap,
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char *buf, const size_t buflen)
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{
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const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
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char scopebuf[IPV6_SCOPE_ID_LEN];
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size_t len;
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int rc;
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len = rpc_ntop6_noscopeid(sap, buf, buflen);
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if (unlikely(len == 0))
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return len;
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if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
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return len;
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if (sin6->sin6_scope_id == 0)
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return len;
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rc = snprintf(scopebuf, sizeof(scopebuf), "%c%u",
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IPV6_SCOPE_DELIMITER, sin6->sin6_scope_id);
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if (unlikely((size_t)rc > sizeof(scopebuf)))
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return 0;
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len += rc;
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if (unlikely(len > buflen))
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return 0;
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strcat(buf, scopebuf);
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return len;
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}
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#else /* !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) */
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static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
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char *buf, const int buflen)
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{
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return 0;
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}
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static size_t rpc_ntop6(const struct sockaddr *sap,
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char *buf, const size_t buflen)
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{
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return 0;
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}
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#endif /* !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) */
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static int rpc_ntop4(const struct sockaddr *sap,
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char *buf, const size_t buflen)
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{
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const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
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return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
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}
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/**
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* rpc_ntop - construct a presentation address in @buf
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* @sap: socket address
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* @buf: construction area
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* @buflen: size of @buf, in bytes
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*
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* Plants a %NUL-terminated string in @buf and returns the length
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* of the string, excluding the %NUL. Otherwise zero is returned.
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*/
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size_t rpc_ntop(const struct sockaddr *sap, char *buf, const size_t buflen)
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{
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switch (sap->sa_family) {
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case AF_INET:
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return rpc_ntop4(sap, buf, buflen);
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case AF_INET6:
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return rpc_ntop6(sap, buf, buflen);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(rpc_ntop);
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static size_t rpc_pton4(const char *buf, const size_t buflen,
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struct sockaddr *sap, const size_t salen)
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{
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struct sockaddr_in *sin = (struct sockaddr_in *)sap;
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u8 *addr = (u8 *)&sin->sin_addr.s_addr;
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if (buflen > INET_ADDRSTRLEN || salen < sizeof(struct sockaddr_in))
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return 0;
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memset(sap, 0, sizeof(struct sockaddr_in));
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if (in4_pton(buf, buflen, addr, '\0', NULL) == 0)
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return 0;
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sin->sin_family = AF_INET;
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return sizeof(struct sockaddr_in);
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}
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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static int rpc_parse_scope_id(const char *buf, const size_t buflen,
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const char *delim, struct sockaddr_in6 *sin6)
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{
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char *p;
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size_t len;
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if ((buf + buflen) == delim)
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return 1;
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if (*delim != IPV6_SCOPE_DELIMITER)
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return 0;
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if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
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return 0;
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len = (buf + buflen) - delim - 1;
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p = kstrndup(delim + 1, len, GFP_KERNEL);
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if (p) {
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unsigned long scope_id = 0;
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struct net_device *dev;
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dev = dev_get_by_name(&init_net, p);
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if (dev != NULL) {
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scope_id = dev->ifindex;
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dev_put(dev);
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} else {
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if (strict_strtoul(p, 10, &scope_id) == 0) {
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kfree(p);
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return 0;
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}
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}
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kfree(p);
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sin6->sin6_scope_id = scope_id;
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return 1;
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}
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return 0;
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}
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static size_t rpc_pton6(const char *buf, const size_t buflen,
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struct sockaddr *sap, const size_t salen)
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{
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
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u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
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const char *delim;
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if (buflen > (INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN) ||
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salen < sizeof(struct sockaddr_in6))
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return 0;
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memset(sap, 0, sizeof(struct sockaddr_in6));
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if (in6_pton(buf, buflen, addr, IPV6_SCOPE_DELIMITER, &delim) == 0)
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return 0;
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if (!rpc_parse_scope_id(buf, buflen, delim, sin6))
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return 0;
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sin6->sin6_family = AF_INET6;
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return sizeof(struct sockaddr_in6);
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}
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#else
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static size_t rpc_pton6(const char *buf, const size_t buflen,
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struct sockaddr *sap, const size_t salen)
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{
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return 0;
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}
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#endif
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/**
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* rpc_pton - Construct a sockaddr in @sap
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* @buf: C string containing presentation format IP address
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* @buflen: length of presentation address in bytes
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* @sap: buffer into which to plant socket address
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* @salen: size of buffer in bytes
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*
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* Returns the size of the socket address if successful; otherwise
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* zero is returned.
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*
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* Plants a socket address in @sap and returns the size of the
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* socket address, if successful. Returns zero if an error
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* occurred.
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*/
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size_t rpc_pton(const char *buf, const size_t buflen,
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struct sockaddr *sap, const size_t salen)
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{
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unsigned int i;
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for (i = 0; i < buflen; i++)
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if (buf[i] == ':')
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return rpc_pton6(buf, buflen, sap, salen);
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return rpc_pton4(buf, buflen, sap, salen);
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}
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EXPORT_SYMBOL_GPL(rpc_pton);
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/**
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* rpc_sockaddr2uaddr - Construct a universal address string from @sap.
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* @sap: socket address
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*
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* Returns a %NUL-terminated string in dynamically allocated memory;
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* otherwise NULL is returned if an error occurred. Caller must
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* free the returned string.
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*/
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char *rpc_sockaddr2uaddr(const struct sockaddr *sap)
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{
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char portbuf[RPCBIND_MAXUADDRPLEN];
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char addrbuf[RPCBIND_MAXUADDRLEN];
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unsigned short port;
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switch (sap->sa_family) {
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case AF_INET:
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if (rpc_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
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return NULL;
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port = ntohs(((struct sockaddr_in *)sap)->sin_port);
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break;
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case AF_INET6:
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if (rpc_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
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return NULL;
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port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
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break;
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default:
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return NULL;
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}
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if (snprintf(portbuf, sizeof(portbuf),
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".%u.%u", port >> 8, port & 0xff) > (int)sizeof(portbuf))
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return NULL;
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if (strlcat(addrbuf, portbuf, sizeof(addrbuf)) > sizeof(addrbuf))
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return NULL;
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return kstrdup(addrbuf, GFP_KERNEL);
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}
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EXPORT_SYMBOL_GPL(rpc_sockaddr2uaddr);
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/**
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* rpc_uaddr2sockaddr - convert a universal address to a socket address.
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* @uaddr: C string containing universal address to convert
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* @uaddr_len: length of universal address string
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* @sap: buffer into which to plant socket address
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* @salen: size of buffer
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*
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* @uaddr does not have to be '\0'-terminated, but strict_strtoul() and
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* rpc_pton() require proper string termination to be successful.
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*
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* Returns the size of the socket address if successful; otherwise
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* zero is returned.
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*/
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size_t rpc_uaddr2sockaddr(const char *uaddr, const size_t uaddr_len,
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struct sockaddr *sap, const size_t salen)
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{
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char *c, buf[RPCBIND_MAXUADDRLEN + sizeof('\0')];
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unsigned long portlo, porthi;
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unsigned short port;
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if (uaddr_len > RPCBIND_MAXUADDRLEN)
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return 0;
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memcpy(buf, uaddr, uaddr_len);
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buf[uaddr_len] = '\0';
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c = strrchr(buf, '.');
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if (unlikely(c == NULL))
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return 0;
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if (unlikely(strict_strtoul(c + 1, 10, &portlo) != 0))
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return 0;
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if (unlikely(portlo > 255))
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return 0;
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*c = '\0';
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c = strrchr(buf, '.');
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if (unlikely(c == NULL))
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return 0;
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if (unlikely(strict_strtoul(c + 1, 10, &porthi) != 0))
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return 0;
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if (unlikely(porthi > 255))
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return 0;
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port = (unsigned short)((porthi << 8) | portlo);
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*c = '\0';
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if (rpc_pton(buf, strlen(buf), sap, salen) == 0)
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return 0;
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switch (sap->sa_family) {
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case AF_INET:
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((struct sockaddr_in *)sap)->sin_port = htons(port);
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return sizeof(struct sockaddr_in);
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case AF_INET6:
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((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
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return sizeof(struct sockaddr_in6);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(rpc_uaddr2sockaddr);
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