diff options
Diffstat (limited to 'src/libsystemd-network/ndisc-option.h')
| -rw-r--r-- | src/libsystemd-network/ndisc-option.h | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/src/libsystemd-network/ndisc-option.h b/src/libsystemd-network/ndisc-option.h new file mode 100644 index 0000000..d7bd861 --- /dev/null +++ b/src/libsystemd-network/ndisc-option.h @@ -0,0 +1,330 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include <inttypes.h> +#include <net/ethernet.h> +#include <netinet/icmp6.h> +#include <netinet/in.h> +#include <netinet/ip6.h> +#include <sys/uio.h> + +#include "sd-ndisc-protocol.h" + +#include "icmp6-packet.h" +#include "macro.h" +#include "set.h" +#include "time-util.h" + +typedef struct sd_ndisc_raw { + uint8_t *bytes; + size_t length; +} sd_ndisc_raw; + +/* Mostly equivalent to struct nd_opt_prefix_info, but using usec_t. */ +typedef struct sd_ndisc_prefix { + uint8_t flags; + uint8_t prefixlen; + struct in6_addr address; + usec_t valid_lifetime; + usec_t preferred_lifetime; + /* timestamp in CLOCK_BOOTTIME, used when sending option for adjusting lifetime. */ + usec_t valid_until; + usec_t preferred_until; +} sd_ndisc_prefix; + +typedef struct sd_ndisc_home_agent { + uint16_t preference; + usec_t lifetime; + usec_t valid_until; +} sd_ndisc_home_agent; + +typedef struct sd_ndisc_route { + uint8_t preference; + uint8_t prefixlen; + struct in6_addr address; + usec_t lifetime; + usec_t valid_until; +} sd_ndisc_route; + +typedef struct sd_ndisc_rdnss { + size_t n_addresses; + struct in6_addr *addresses; + usec_t lifetime; + usec_t valid_until; +} sd_ndisc_rdnss; + +typedef struct sd_ndisc_dnssl { + char **domains; + usec_t lifetime; + usec_t valid_until; +} sd_ndisc_dnssl; + +typedef struct sd_ndisc_prefix64 { + uint8_t prefixlen; + struct in6_addr prefix; + usec_t lifetime; + usec_t valid_until; +} sd_ndisc_prefix64; + +typedef struct sd_ndisc_option { + uint8_t type; + size_t offset; + + union { + sd_ndisc_raw raw; /* for testing or unsupported options */ + struct ether_addr mac; /* SD_NDISC_OPTION_SOURCE_LL_ADDRESS or SD_NDISC_OPTION_TARGET_LL_ADDRESS */ + sd_ndisc_prefix prefix; /* SD_NDISC_OPTION_PREFIX_INFORMATION */ + struct ip6_hdr hdr; /* SD_NDISC_OPTION_REDIRECTED_HEADER */ + uint32_t mtu; /* SD_NDISC_OPTION_MTU */ + sd_ndisc_home_agent home_agent; /* SD_NDISC_OPTION_HOME_AGENT */ + sd_ndisc_route route; /* SD_NDISC_OPTION_ROUTE_INFORMATION */ + sd_ndisc_rdnss rdnss; /* SD_NDISC_OPTION_RDNSS */ + uint64_t extended_flags; /* SD_NDISC_OPTION_FLAGS_EXTENSION */ + sd_ndisc_dnssl dnssl; /* SD_NDISC_OPTION_DNSSL */ + char *captive_portal; /* SD_NDISC_OPTION_CAPTIVE_PORTAL */ + sd_ndisc_prefix64 prefix64; /* SD_NDISC_OPTION_PREF64 */ + }; +} sd_ndisc_option; + +/* RFC 8781: PREF64 or (NAT64 prefix) */ +#define PREF64_SCALED_LIFETIME_MASK 0xfff8 +#define PREF64_PLC_MASK 0x0007 +#define PREF64_MAX_LIFETIME_USEC (65528 * USEC_PER_SEC) + +typedef enum PrefixLengthCode { + PREFIX_LENGTH_CODE_96, + PREFIX_LENGTH_CODE_64, + PREFIX_LENGTH_CODE_56, + PREFIX_LENGTH_CODE_48, + PREFIX_LENGTH_CODE_40, + PREFIX_LENGTH_CODE_32, + _PREFIX_LENGTH_CODE_MAX, + _PREFIX_LENGTH_CODE_INVALID = -EINVAL, +} PrefixLengthCode; + +/* rfc8781: section 4 - Scaled Lifetime: 13-bit unsigned integer. PREFIX_LEN (Prefix Length Code): 3-bit unsigned integer */ +struct nd_opt_prefix64_info { + uint8_t type; + uint8_t length; + uint16_t lifetime_and_plc; + uint8_t prefix[12]; +} _packed_; + +int pref64_prefix_length_to_plc(uint8_t prefixlen, uint8_t *ret); + +sd_ndisc_option* ndisc_option_free(sd_ndisc_option *option); + +int ndisc_option_parse( + ICMP6Packet *p, + size_t offset, + uint8_t *ret_type, + size_t *ret_len, + const uint8_t **ret_opt); + +int ndisc_parse_options(ICMP6Packet *p, Set **ret_options); + +static inline sd_ndisc_option* ndisc_option_get(Set *options, const sd_ndisc_option *p) { + return set_get(options, ASSERT_PTR(p)); +} +static inline sd_ndisc_option* ndisc_option_get_by_type(Set *options, uint8_t type) { + return ndisc_option_get(options, &(const sd_ndisc_option) { .type = type }); +} +int ndisc_option_get_mac(Set *options, uint8_t type, struct ether_addr *ret); + +static inline void ndisc_option_remove(Set *options, const sd_ndisc_option *p) { + ndisc_option_free(set_remove(options, ASSERT_PTR(p))); +} +static inline void ndisc_option_remove_by_type(Set *options, uint8_t type) { + ndisc_option_remove(options, &(const sd_ndisc_option) { .type = type }); +} + +int ndisc_option_set_raw( + Set **options, + size_t length, + const uint8_t *bytes); +int ndisc_option_add_link_layer_address( + Set **options, + uint8_t type, + size_t offset, + const struct ether_addr *mac); +static inline int ndisc_option_set_link_layer_address( + Set **options, + uint8_t type, + const struct ether_addr *mac) { + return ndisc_option_add_link_layer_address(options, type, 0, mac); +} +int ndisc_option_add_prefix_internal( + Set **options, + size_t offset, + uint8_t flags, + uint8_t prefixlen, + const struct in6_addr *address, + usec_t valid_lifetime, + usec_t preferred_lifetime, + usec_t valid_until, + usec_t preferred_until); +static inline int ndisc_option_add_prefix( + Set **options, + size_t offset, + uint8_t flags, + uint8_t prefixlen, + const struct in6_addr *address, + usec_t valid_lifetime, + usec_t preferred_lifetime) { + return ndisc_option_add_prefix_internal(options, offset, flags, prefixlen, address, + valid_lifetime, preferred_lifetime, + USEC_INFINITY, USEC_INFINITY); +} +static inline int ndisc_option_set_prefix( + Set **options, + uint8_t flags, + uint8_t prefixlen, + const struct in6_addr *address, + usec_t valid_lifetime, + usec_t preferred_lifetime, + usec_t valid_until, + usec_t preferred_until) { + return ndisc_option_add_prefix_internal(options, 0, flags, prefixlen, address, + valid_lifetime, preferred_lifetime, + valid_until, preferred_until); +} +int ndisc_option_add_redirected_header( + Set **options, + size_t offset, + const struct ip6_hdr *hdr); +int ndisc_option_add_mtu( + Set **options, + size_t offset, + uint32_t mtu); +static inline int ndisc_option_set_mtu( + Set **options, + uint32_t mtu) { + return ndisc_option_add_mtu(options, 0, mtu); +} +int ndisc_option_add_home_agent_internal( + Set **options, + size_t offset, + uint16_t preference, + usec_t lifetime, + usec_t valid_until); +static inline int ndisc_option_add_home_agent( + Set **options, + size_t offset, + uint16_t preference, + usec_t lifetime) { + return ndisc_option_add_home_agent_internal(options, offset, preference, lifetime, USEC_INFINITY); +} +static inline int ndisc_option_set_home_agent( + Set **options, + uint16_t preference, + usec_t lifetime, + usec_t valid_until) { + return ndisc_option_add_home_agent_internal(options, 0, preference, lifetime, valid_until); +} +int ndisc_option_add_route_internal( + Set **options, + size_t offset, + uint8_t preference, + uint8_t prefixlen, + const struct in6_addr *prefix, + usec_t lifetime, + usec_t valid_until); +static inline int ndisc_option_add_route( + Set **options, + size_t offset, + uint8_t preference, + uint8_t prefixlen, + const struct in6_addr *prefix, + usec_t lifetime) { + return ndisc_option_add_route_internal(options, offset, preference, prefixlen, prefix, lifetime, USEC_INFINITY); +} +static inline int ndisc_option_set_route( + Set **options, + uint8_t preference, + uint8_t prefixlen, + const struct in6_addr *prefix, + usec_t lifetime, + usec_t valid_until) { + return ndisc_option_add_route_internal(options, 0, preference, prefixlen, prefix, lifetime, valid_until); +} +int ndisc_option_add_rdnss_internal( + Set **options, + size_t offset, + size_t n_addresses, + const struct in6_addr *addresses, + usec_t lifetime, + usec_t valid_until); +static inline int ndisc_option_add_rdnss( + Set **options, + size_t offset, + size_t n_addresses, + const struct in6_addr *addresses, + usec_t lifetime) { + return ndisc_option_add_rdnss_internal(options, offset, n_addresses, addresses, lifetime, USEC_INFINITY); +} +static inline int ndisc_option_set_rdnss( + Set **options, + size_t n_addresses, + const struct in6_addr *addresses, + usec_t lifetime, + usec_t valid_until) { + return ndisc_option_add_rdnss_internal(options, 0, n_addresses, addresses, lifetime, valid_until); +} +int ndisc_option_add_flags_extension( + Set **options, + size_t offset, + uint64_t flags); +int ndisc_option_add_dnssl_internal( + Set **options, + size_t offset, + char * const *domains, + usec_t lifetime, + usec_t valid_until); +static inline int ndisc_option_add_dnssl( + Set **options, + size_t offset, + char * const *domains, + usec_t lifetime) { + return ndisc_option_add_dnssl_internal(options, offset, domains, lifetime, USEC_INFINITY); +} +static inline int ndisc_option_set_dnssl( + Set **options, + char * const *domains, + usec_t lifetime, + usec_t valid_until) { + return ndisc_option_add_dnssl_internal(options, 0, domains, lifetime, valid_until); +} +int ndisc_option_add_captive_portal( + Set **options, + size_t offset, + const char *portal); +static inline int ndisc_option_set_captive_portal( + Set **options, + const char *portal) { + return ndisc_option_add_captive_portal(options, 0, portal); +} +int ndisc_option_add_prefix64_internal( + Set **options, + size_t offset, + uint8_t prefixlen, + const struct in6_addr *prefix, + usec_t lifetime, + usec_t valid_until); +static inline int ndisc_option_add_prefix64( + Set **options, + size_t offset, + uint8_t prefixlen, + const struct in6_addr *prefix, + usec_t lifetime) { + return ndisc_option_add_prefix64_internal(options, offset, prefixlen, prefix, lifetime, USEC_INFINITY); +} +static inline int ndisc_option_set_prefix64( + Set **options, + uint8_t prefixlen, + const struct in6_addr *prefix, + usec_t lifetime, + usec_t valid_until) { + return ndisc_option_add_prefix64_internal(options, 0, prefixlen, prefix, lifetime, valid_until); +} + +int ndisc_send(int fd, const struct in6_addr *dst, const struct icmp6_hdr *hdr, Set *options, usec_t timestamp); |