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358 lines
8.7 KiB
358 lines
8.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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/addr.h> |
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#include <linux/sunrpc/msg_prot.h> |
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#include <linux/slab.h> |
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#include <linux/export.h> |
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#if IS_ENABLED(CONFIG_IPV6) |
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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 /* !IS_ENABLED(CONFIG_IPV6) */ |
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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 /* !IS_ENABLED(CONFIG_IPV6) */ |
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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 IS_ENABLED(CONFIG_IPV6) |
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static int rpc_parse_scope_id(struct net *net, const char *buf, |
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const size_t buflen, const char *delim, |
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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 = kmemdup_nul(delim + 1, len, GFP_KERNEL); |
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if (p) { |
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u32 scope_id = 0; |
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struct net_device *dev; |
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dev = dev_get_by_name(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 (kstrtou32(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(struct net *net, 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(net, 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(struct net *net, 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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* @net: applicable network namespace |
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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(struct net *net, 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(net, 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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* @gfp_flags: allocation mode |
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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, gfp_t gfp_flags) |
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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_flags); |
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} |
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/** |
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* rpc_uaddr2sockaddr - convert a universal address to a socket address. |
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* @net: applicable network namespace |
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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 kstrtou8() 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(struct net *net, const char *uaddr, |
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const size_t uaddr_len, struct sockaddr *sap, |
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const size_t salen) |
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{ |
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char *c, buf[RPCBIND_MAXUADDRLEN + sizeof('\0')]; |
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u8 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(kstrtou8(c + 1, 10, &portlo) != 0)) |
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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(kstrtou8(c + 1, 10, &porthi) != 0)) |
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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(net, 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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