072320eab0
The DHCP client should not pre-filter addresses beyond what RFC
requires. If a client's user (like networkd) wishes to skip/filter
certain addresses, it's their responsibility.
The point of this is that the DHCP library does not hide/abstract
information that might be relevant for certain users. For example,
NetworkManager exposes DHCP options in its API. When doing that, the
options should be close to the actual lease.
This is related to commit d9ec2e632d
(dhcp4: filter bogus DNS/NTP server addresses silently).
73 lines
3.4 KiB
C
73 lines
3.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include <netinet/in.h>
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#include <stddef.h>
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#include <sys/socket.h>
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#include "hash-funcs.h"
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#include "macro.h"
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#include "util.h"
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union in_addr_union {
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struct in_addr in;
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struct in6_addr in6;
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};
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struct in_addr_data {
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int family;
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union in_addr_union address;
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};
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bool in4_addr_is_null(const struct in_addr *a);
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int in_addr_is_null(int family, const union in_addr_union *u);
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int in_addr_is_multicast(int family, const union in_addr_union *u);
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bool in4_addr_is_link_local(const struct in_addr *a);
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int in_addr_is_link_local(int family, const union in_addr_union *u);
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bool in4_addr_is_localhost(const struct in_addr *a);
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int in_addr_is_localhost(int family, const union in_addr_union *u);
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bool in4_addr_is_non_local(const struct in_addr *a);
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int in_addr_equal(int family, const union in_addr_union *a, const union in_addr_union *b);
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int in_addr_prefix_intersect(int family, const union in_addr_union *a, unsigned aprefixlen, const union in_addr_union *b, unsigned bprefixlen);
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int in_addr_prefix_next(int family, union in_addr_union *u, unsigned prefixlen);
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int in_addr_to_string(int family, const union in_addr_union *u, char **ret);
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int in_addr_ifindex_to_string(int family, const union in_addr_union *u, int ifindex, char **ret);
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int in_addr_from_string(int family, const char *s, union in_addr_union *ret);
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int in_addr_from_string_auto(const char *s, int *ret_family, union in_addr_union *ret);
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int in_addr_ifindex_from_string_auto(const char *s, int *family, union in_addr_union *ret, int *ifindex);
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unsigned char in4_addr_netmask_to_prefixlen(const struct in_addr *addr);
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struct in_addr* in4_addr_prefixlen_to_netmask(struct in_addr *addr, unsigned char prefixlen);
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int in4_addr_default_prefixlen(const struct in_addr *addr, unsigned char *prefixlen);
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int in4_addr_default_subnet_mask(const struct in_addr *addr, struct in_addr *mask);
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int in_addr_mask(int family, union in_addr_union *addr, unsigned char prefixlen);
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int in_addr_prefix_covers(int family, const union in_addr_union *prefix, unsigned char prefixlen, const union in_addr_union *address);
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int in_addr_parse_prefixlen(int family, const char *p, unsigned char *ret);
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int in_addr_prefix_from_string(const char *p, int family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen);
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typedef enum InAddrPrefixLenMode {
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PREFIXLEN_FULL, /* Default to prefixlen of address size, 32 for IPv4 or 128 for IPv6, if not specified. */
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PREFIXLEN_REFUSE, /* Fail with -ENOANO if prefixlen is not specified. */
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PREFIXLEN_LEGACY, /* Default to legacy default prefixlen calculation from address if not specified. */
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} InAddrPrefixLenMode;
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int in_addr_prefix_from_string_auto_internal(const char *p, InAddrPrefixLenMode mode, int *ret_family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen);
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static inline int in_addr_prefix_from_string_auto(const char *p, int *ret_family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen) {
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return in_addr_prefix_from_string_auto_internal(p, PREFIXLEN_FULL, ret_family, ret_prefix, ret_prefixlen);
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}
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static inline size_t FAMILY_ADDRESS_SIZE(int family) {
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assert(IN_SET(family, AF_INET, AF_INET6));
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return family == AF_INET6 ? 16 : 4;
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}
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/* Workaround for clang, explicitly specify the maximum-size element here.
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* See also oss-fuzz#11344. */
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#define IN_ADDR_NULL ((union in_addr_union) { .in6 = {} })
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extern const struct hash_ops in_addr_data_hash_ops;
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