#include "networkd-manager.h"
#include "networkd-ndisc.h"
#include "networkd-route.h"
+#include "string-util.h"
#include "strv.h"
#define NDISC_DNSSL_MAX 64U
#define NDISC_RDNSS_MAX 64U
#define NDISC_PREFIX_LFT_MIN 7200U
+#define DAD_CONFLICTS_IDGEN_RETRIES_RFC7217 3
+
+/* https://tools.ietf.org/html/rfc5453 */
+/* https://www.iana.org/assignments/ipv6-interface-ids/ipv6-interface-ids.xml */
+
+#define SUBNET_ROUTER_ANYCAST_ADDRESS_RFC4291 ((struct in6_addr) { .s6_addr = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } })
+#define SUBNET_ROUTER_ANYCAST_PREFIXLEN 8
+#define RESERVED_IPV6_INTERFACE_IDENTIFIERS_ADDRESS_RFC4291 ((struct in6_addr) { .s6_addr = { 0x02, 0x00, 0x5E, 0xFF, 0xFE } })
+#define RESERVED_IPV6_INTERFACE_IDENTIFIERS_PREFIXLEN 5
+#define RESERVED_SUBNET_ANYCAST_ADDRESSES_RFC4291 ((struct in6_addr) { .s6_addr = { 0xFD, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF } })
+#define RESERVED_SUBNET_ANYCAST_PREFIXLEN 7
+
+#define NDISC_APP_ID SD_ID128_MAKE(13,ac,81,a7,d5,3f,49,78,92,79,5d,0c,29,3a,bc,7e)
+
+static bool stableprivate_address_is_valid(const struct in6_addr *addr) {
+ assert(addr);
+
+ /* According to rfc4291, generated address should not be in the following ranges. */
+
+ if (memcmp(addr, &SUBNET_ROUTER_ANYCAST_ADDRESS_RFC4291, SUBNET_ROUTER_ANYCAST_PREFIXLEN) == 0)
+ return false;
+
+ if (memcmp(addr, &RESERVED_IPV6_INTERFACE_IDENTIFIERS_ADDRESS_RFC4291, RESERVED_IPV6_INTERFACE_IDENTIFIERS_PREFIXLEN) == 0)
+ return false;
+
+ if (memcmp(addr, &RESERVED_SUBNET_ANYCAST_ADDRESSES_RFC4291, RESERVED_SUBNET_ANYCAST_PREFIXLEN) == 0)
+ return false;
+
+ return true;
+}
+
+static int make_stableprivate_address(Link *link, const struct in6_addr *prefix, uint8_t prefix_len, uint8_t dad_counter, struct in6_addr *addr) {
+ sd_id128_t secret_key;
+ struct siphash state;
+ uint64_t rid;
+ size_t l;
+ int r;
+
+ /* According to rfc7217 section 5.1
+ * RID = F(Prefix, Net_Iface, Network_ID, DAD_Counter, secret_key) */
+
+ r = sd_id128_get_machine_app_specific(NDISC_APP_ID, &secret_key);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate key: %m");
+
+ siphash24_init(&state, secret_key.bytes);
+
+ l = MAX(DIV_ROUND_UP(prefix_len, 8), 8);
+ siphash24_compress(prefix, l, &state);
+ siphash24_compress(link->ifname, strlen(link->ifname), &state);
+ siphash24_compress(&link->mac, sizeof(struct ether_addr), &state);
+ siphash24_compress(&dad_counter, sizeof(uint8_t), &state);
+
+ rid = htole64(siphash24_finalize(&state));
+
+ memcpy(addr->s6_addr, prefix->s6_addr, l);
+ memcpy((uint8_t *) &addr->s6_addr + l, &rid, 16 - l);
+
+ return 0;
+}
+
static int ndisc_netlink_route_message_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
return 0;
}
+static int ndisc_router_generate_address(Link *link, unsigned prefixlen, uint32_t lifetime_preferred, Address *address) {
+ bool prefix = false;
+ struct in6_addr addr;
+ IPv6Token *j;
+ Iterator i;
+ int r;
+
+ assert(address);
+ assert(link);
+
+ addr = address->in_addr.in6;
+ ORDERED_HASHMAP_FOREACH(j, link->network->ipv6_tokens, i)
+ if (j->address_generation_type == IPV6_TOKEN_ADDRESS_GENERATION_PREFIXSTABLE
+ && memcmp(&j->prefix, &addr, FAMILY_ADDRESS_SIZE(address->family)) == 0) {
+ for (; j->dad_counter < DAD_CONFLICTS_IDGEN_RETRIES_RFC7217; j->dad_counter++) {
+ r = make_stableprivate_address(link, &j->prefix, prefixlen, j->dad_counter, &address->in_addr.in6);
+ if (r < 0)
+ return r;
+
+ if (stableprivate_address_is_valid(&address->in_addr.in6)) {
+ prefix = true;
+ break;
+ }
+ }
+ } else if (j->address_generation_type == IPV6_TOKEN_ADDRESS_GENERATION_EUI64) {
+ memcpy(((uint8_t *)&address->in_addr.in6) + 8, ((uint8_t *) &j->prefix) + 8, 8);
+ prefix = true;
+ break;
+ }
+
+ /* eui64 or fallback if prefixstable do not match */
+ if (!prefix) {
+ /* see RFC4291 section 2.5.1 */
+ address->in_addr.in6.s6_addr[8] = link->mac.ether_addr_octet[0];
+ address->in_addr.in6.s6_addr[8] ^= 1 << 1;
+ address->in_addr.in6.s6_addr[9] = link->mac.ether_addr_octet[1];
+ address->in_addr.in6.s6_addr[10] = link->mac.ether_addr_octet[2];
+ address->in_addr.in6.s6_addr[11] = 0xff;
+ address->in_addr.in6.s6_addr[12] = 0xfe;
+ address->in_addr.in6.s6_addr[13] = link->mac.ether_addr_octet[3];
+ address->in_addr.in6.s6_addr[14] = link->mac.ether_addr_octet[4];
+ address->in_addr.in6.s6_addr[15] = link->mac.ether_addr_octet[5];
+ }
+
+ address->prefixlen = prefixlen;
+ address->flags = IFA_F_NOPREFIXROUTE|IFA_F_MANAGETEMPADDR;
+ address->cinfo.ifa_prefered = lifetime_preferred;
+
+ return 0;
+}
static int ndisc_router_process_autonomous_prefix(Link *link, sd_ndisc_router *rt) {
+ uint32_t lifetime_valid, lifetime_preferred, lifetime_remaining;
_cleanup_(address_freep) Address *address = NULL;
Address *existing_address;
- uint32_t lifetime_valid, lifetime_preferred, lifetime_remaining;
- usec_t time_now;
unsigned prefixlen;
+ usec_t time_now;
int r;
assert(link);
if (r < 0)
return log_link_error_errno(link, r, "Failed to get prefix address: %m");
- if (in_addr_is_null(AF_INET6, (const union in_addr_union *) &link->network->ipv6_token) == 0)
- memcpy(((char *)&address->in_addr.in6) + 8, ((char *)&link->network->ipv6_token) + 8, 8);
- else {
- /* see RFC4291 section 2.5.1 */
- address->in_addr.in6.s6_addr[8] = link->mac.ether_addr_octet[0];
- address->in_addr.in6.s6_addr[8] ^= 1 << 1;
- address->in_addr.in6.s6_addr[9] = link->mac.ether_addr_octet[1];
- address->in_addr.in6.s6_addr[10] = link->mac.ether_addr_octet[2];
- address->in_addr.in6.s6_addr[11] = 0xff;
- address->in_addr.in6.s6_addr[12] = 0xfe;
- address->in_addr.in6.s6_addr[13] = link->mac.ether_addr_octet[3];
- address->in_addr.in6.s6_addr[14] = link->mac.ether_addr_octet[4];
- address->in_addr.in6.s6_addr[15] = link->mac.ether_addr_octet[5];
- }
- address->prefixlen = prefixlen;
- address->flags = IFA_F_NOPREFIXROUTE|IFA_F_MANAGETEMPADDR;
- address->cinfo.ifa_prefered = lifetime_preferred;
+ r = ndisc_router_generate_address(link, prefixlen, lifetime_preferred, address);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Falied to generate prefix stable address: %m");
/* see RFC4862 section 5.5.3.e */
r = address_get(link, address->family, &address->in_addr, address->prefixlen, &existing_address);
link->ndisc_dnssl = set_free_free(link->ndisc_dnssl);
}
+int ipv6token_new(IPv6Token **ret) {
+ IPv6Token *p;
+
+ p = new(IPv6Token, 1);
+ if (!p)
+ return -ENOMEM;
+
+ *p = (IPv6Token) {
+ .address_generation_type = IPV6_TOKEN_ADDRESS_GENERATION_NONE,
+ };
+
+ *ret = TAKE_PTR(p);
+
+ return 0;
+}
+
+DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(
+ ipv6_token_hash_ops,
+ void,
+ trivial_hash_func,
+ trivial_compare_func,
+ IPv6Token,
+ free);
+
int config_parse_ndisc_black_listed_prefix(
const char *unit,
const char *filename,
return 0;
}
+
+int config_parse_address_generation_type(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ _cleanup_free_ IPv6Token *token = NULL;
+ _cleanup_free_ char *word = NULL;
+ union in_addr_union buffer;
+ Network *network = data;
+ const char *p;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if (isempty(rvalue)) {
+ network->ipv6_tokens = ordered_hashmap_free(network->ipv6_tokens);
+ return 0;
+ }
+
+ p = rvalue;
+ r = extract_first_word(&p, &word, ":", 0);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r <= 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r,
+ "Invalid IPv6Token= , ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ r = ipv6token_new(&token);
+ if (r < 0)
+ return log_oom();
+
+ if (streq(word, "eui64"))
+ token->address_generation_type = IPV6_TOKEN_ADDRESS_GENERATION_EUI64;
+ else if (streq(word, "prefixstable"))
+ token->address_generation_type = IPV6_TOKEN_ADDRESS_GENERATION_PREFIXSTABLE;
+ else {
+ token->address_generation_type = IPV6_TOKEN_ADDRESS_GENERATION_EUI64;
+ p = rvalue;
+ }
+
+ r = in_addr_from_string(AF_INET6, p, &buffer);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r,
+ "Failed to parse IPv6 %s, ignoring: %s", lvalue, rvalue);
+ return 0;
+ }
+
+ if (in_addr_is_null(AF_INET6, &buffer)) {
+ log_syntax(unit, LOG_ERR, filename, line, 0,
+ "IPv6 %s cannot be the ANY address, ignoring: %s", lvalue, rvalue);
+ return 0;
+ }
+
+ token->prefix = buffer.in6;
+
+ r = ordered_hashmap_ensure_allocated(&network->ipv6_tokens, &ipv6_token_hash_ops);
+ if (r < 0)
+ return log_oom();
+
+ r = ordered_hashmap_put(network->ipv6_tokens, &token->prefix, token);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r,
+ "Failed to store IPv6 token '%s'", rvalue);
+ return 0;
+ }
+
+ TAKE_PTR(token);
+
+ return 0;
+}
projects / thirdparty / systemd.git / commitdiff
