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7a8ed9459d
There are some places in passt/pasta which #include <assert.h> and make various assertions. If we hit these something has already gone wrong, but they're there so that we a useful message instead of cryptic misbehaviour if assumptions we thought were correct turn out not to be. Except.. the glibc implementation of assert() uses syscalls that aren't in our seccomp filter, so we'll get a SIGSYS before it actually prints the message. Work around this by adding our own ASSERT() implementation using our existing err() function to log the message, and an abort(). The abort() probably also won't work exactly right with seccomp, but once we've printed the message, dying with a SIGSYS works just as well as dying with a SIGABRT. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/* SPDX-License-Identifier: AGPL-3.0-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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