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https://passt.top/passt
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ca2749e1bd
In practical terms, passt doesn't benefit from the additional protection offered by the AGPL over the GPL, because it's not suitable to be executed over a computer network. Further, restricting the distribution under the version 3 of the GPL wouldn't provide any practical advantage either, as long as the passt codebase is concerned, and might cause unnecessary compatibility dilemmas. Change licensing terms to the GNU General Public License Version 2, or any later version, with written permission from all current and past contributors, namely: myself, David Gibson, Laine Stump, Andrea Bolognani, Paul Holzinger, Richard W.M. Jones, Chris Kuhn, Florian Weimer, Giuseppe Scrivano, Stefan Hajnoczi, and Vasiliy Ulyanov. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright Red Hat
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* Author: David Gibson <david@gibson.dropbear.id.au>
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*
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* inany.h - Types and helpers for handling addresses which could be
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* IPv6 or IPv4 (encoded as IPv4-mapped IPv6 addresses)
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*/
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/** union inany_addr - Represents either an IPv4 or IPv6 address
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* @a6: Address as an IPv6 address, may be IPv4-mapped
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* @v4mapped.zero: All zero-bits for an IPv4 address
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* @v4mapped.one: All one-bits for an IPv4 address
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* @v4mapped.a4: If @a6 is an IPv4 mapped address, the IPv4 address
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*
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* @v4mapped shouldn't be accessed except via helpers.
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*/
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union inany_addr {
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struct in6_addr a6;
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struct {
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uint8_t zero[10];
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uint8_t one[2];
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struct in_addr a4;
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} v4mapped;
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};
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/** inany_v4 - Extract IPv4 address, if present, from IPv[46] address
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* @addr: IPv4 or IPv6 address
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*
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* Return: IPv4 address if @addr is IPv4, NULL otherwise
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*/
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static inline struct in_addr *inany_v4(const union inany_addr *addr)
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{
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if (!IN6_IS_ADDR_V4MAPPED(&addr->a6))
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return NULL;
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return (struct in_addr *)&addr->v4mapped.a4;
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}
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/** inany_equals - Compare two IPv[46] addresses
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* @a, @b: IPv[46] addresses
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*
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* Return: true if @a and @b are the same address
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*/
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static inline bool inany_equals(const union inany_addr *a,
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const union inany_addr *b)
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{
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return IN6_ARE_ADDR_EQUAL(&a->a6, &b->a6);
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}
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/** inany_from_af - Set IPv[46] address from IPv4 or IPv6 address
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* @aa: Pointer to store IPv[46] address
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* @af: Address family of @addr
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* @addr: struct in_addr (IPv4) or struct in6_addr (IPv6)
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*/
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static inline void inany_from_af(union inany_addr *aa, int af, const void *addr)
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{
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if (af == AF_INET6) {
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aa->a6 = *((struct in6_addr *)addr);
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} else if (af == AF_INET) {
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memset(&aa->v4mapped.zero, 0, sizeof(aa->v4mapped.zero));
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memset(&aa->v4mapped.one, 0xff, sizeof(aa->v4mapped.one));
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aa->v4mapped.a4 = *((struct in_addr *)addr);
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} else {
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/* Not valid to call with other address families */
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ASSERT(0);
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}
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}
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/** inany_from_sockaddr - Extract IPv[46] address and port number from sockaddr
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* @aa: Pointer to store IPv[46] address
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* @port: Pointer to store port number, host order
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* @addr: struct sockaddr_in (IPv4) or struct sockaddr_in6 (IPv6)
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*/
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static inline void inany_from_sockaddr(union inany_addr *aa, in_port_t *port,
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const void *addr)
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{
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const struct sockaddr *sa = (const struct sockaddr *)addr;
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if (sa->sa_family == AF_INET6) {
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struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa;
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inany_from_af(aa, AF_INET6, &sa6->sin6_addr);
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*port = ntohs(sa6->sin6_port);
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} else if (sa->sa_family == AF_INET) {
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struct sockaddr_in *sa4 = (struct sockaddr_in *)sa;
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inany_from_af(aa, AF_INET, &sa4->sin_addr);
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*port = ntohs(sa4->sin_port);
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} else {
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/* Not valid to call with other address families */
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ASSERT(0);
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}
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}
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