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https://github.com/systemd/systemd-stable.git
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network: Allow multiple IPv6Token 'static' items to generate addresses
This patch allows multiple addresses using 'static' IPv6Tokens to be generated for a single network interface.
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@ -322,9 +322,6 @@
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using the EUI-64 algorithm. Because the interface identifier is static, if Duplicate Address Detection
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detects that the computed address is a duplicate (in use by another node on the link), then this
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mode will fail to provide an address for that prefix.
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Note that if multiple <constant>static</constant> IPv6Token variables are supplied, only the first
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one will be used to generate addresses.
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</para>
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<para>When the mode is set to <literal>prefixstable</literal> the RFC 7217 algorithm for generating
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interface identifiers will be used, but only when a prefix received in an RA message matches the supplied address.
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@ -254,18 +254,32 @@ static int ndisc_router_process_default(Link *link, sd_ndisc_router *rt) {
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return 0;
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}
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static int ndisc_router_generate_address(Link *link, unsigned prefixlen, uint32_t lifetime_preferred, Address *address) {
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bool have_address = false;
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static int ndisc_router_generate_addresses(Link *link, unsigned prefixlen, uint32_t lifetime_preferred, Address *address, Set **ret) {
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_cleanup_set_free_free_ Set *addresses = NULL;
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struct in6_addr addr;
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IPv6Token *j;
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Iterator i;
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int r;
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assert(address);
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assert(link);
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assert(address);
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assert(ret);
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addresses = set_new(&address_hash_ops);
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if (!addresses)
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return log_oom();
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addr = address->in_addr.in6;
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ORDERED_HASHMAP_FOREACH(j, link->network->ipv6_tokens, i)
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ORDERED_HASHMAP_FOREACH(j, link->network->ipv6_tokens, i) {
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bool have_address = false;
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_cleanup_(address_freep) Address *new_address = NULL;
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r = address_new(&new_address);
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if (r < 0)
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return log_oom();
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*new_address = *address;
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if (j->address_generation_type == IPV6_TOKEN_ADDRESS_GENERATION_PREFIXSTABLE
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&& memcmp(&j->prefix, &addr, FAMILY_ADDRESS_SIZE(address->family)) == 0) {
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/* While this loop uses dad_counter and a retry limit as specified in RFC 7217, the loop
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@ -274,47 +288,75 @@ static int ndisc_router_generate_address(Link *link, unsigned prefixlen, uint32_
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may exit with an address which ends up being unusable due to duplication on the link.
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*/
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for (; j->dad_counter < DAD_CONFLICTS_IDGEN_RETRIES_RFC7217; j->dad_counter++) {
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r = make_stableprivate_address(link, &j->prefix, prefixlen, j->dad_counter, &address->in_addr.in6);
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r = make_stableprivate_address(link, &j->prefix, prefixlen, j->dad_counter, &new_address->in_addr.in6);
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if (r < 0)
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return r;
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break;
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if (stableprivate_address_is_valid(&address->in_addr.in6)) {
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if (stableprivate_address_is_valid(&new_address->in_addr.in6)) {
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have_address = true;
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break;
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}
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}
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} else if (j->address_generation_type == IPV6_TOKEN_ADDRESS_GENERATION_STATIC) {
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memcpy(((uint8_t *)&address->in_addr.in6) + 8, ((uint8_t *) &j->prefix) + 8, 8);
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memcpy(((uint8_t *)&new_address->in_addr.in6) + 8, ((uint8_t *) &j->prefix) + 8, 8);
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have_address = true;
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break;
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}
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/* fall back to EUI-64 if neither prefixstable nor static provide an address */
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if (!have_address) {
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/* see RFC4291 section 2.5.1 */
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address->in_addr.in6.s6_addr[8] = link->mac.ether_addr_octet[0];
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address->in_addr.in6.s6_addr[8] ^= 1 << 1;
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address->in_addr.in6.s6_addr[9] = link->mac.ether_addr_octet[1];
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address->in_addr.in6.s6_addr[10] = link->mac.ether_addr_octet[2];
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address->in_addr.in6.s6_addr[11] = 0xff;
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address->in_addr.in6.s6_addr[12] = 0xfe;
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address->in_addr.in6.s6_addr[13] = link->mac.ether_addr_octet[3];
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address->in_addr.in6.s6_addr[14] = link->mac.ether_addr_octet[4];
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address->in_addr.in6.s6_addr[15] = link->mac.ether_addr_octet[5];
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if (have_address) {
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new_address->prefixlen = prefixlen;
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new_address->flags = IFA_F_NOPREFIXROUTE|IFA_F_MANAGETEMPADDR;
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new_address->cinfo.ifa_prefered = lifetime_preferred;
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r = set_put(addresses, new_address);
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if (r < 0)
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return log_link_warning_errno(link, r, "Failed to store address: %m");
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TAKE_PTR(new_address);
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}
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}
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address->prefixlen = prefixlen;
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address->flags = IFA_F_NOPREFIXROUTE|IFA_F_MANAGETEMPADDR;
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address->cinfo.ifa_prefered = lifetime_preferred;
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/* fall back to EUI-64 if no tokens provided addresses */
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if (set_isempty(addresses)) {
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_cleanup_(address_freep) Address *new_address = NULL;
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r = address_new(&new_address);
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if (r < 0)
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return log_oom();
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*new_address = *address;
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/* see RFC4291 section 2.5.1 */
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new_address->in_addr.in6.s6_addr[8] = link->mac.ether_addr_octet[0];
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new_address->in_addr.in6.s6_addr[8] ^= 1 << 1;
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new_address->in_addr.in6.s6_addr[9] = link->mac.ether_addr_octet[1];
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new_address->in_addr.in6.s6_addr[10] = link->mac.ether_addr_octet[2];
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new_address->in_addr.in6.s6_addr[11] = 0xff;
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new_address->in_addr.in6.s6_addr[12] = 0xfe;
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new_address->in_addr.in6.s6_addr[13] = link->mac.ether_addr_octet[3];
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new_address->in_addr.in6.s6_addr[14] = link->mac.ether_addr_octet[4];
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new_address->in_addr.in6.s6_addr[15] = link->mac.ether_addr_octet[5];
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new_address->prefixlen = prefixlen;
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new_address->flags = IFA_F_NOPREFIXROUTE|IFA_F_MANAGETEMPADDR;
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new_address->cinfo.ifa_prefered = lifetime_preferred;
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r = set_put(addresses, new_address);
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if (r < 0)
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return log_link_warning_errno(link, r, "Failed to store address: %m");
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TAKE_PTR(new_address);
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}
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*ret = TAKE_PTR(addresses);
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return 0;
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}
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static int ndisc_router_process_autonomous_prefix(Link *link, sd_ndisc_router *rt) {
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uint32_t lifetime_valid, lifetime_preferred, lifetime_remaining;
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_cleanup_set_free_free_ Set *addresses = NULL;
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_cleanup_(address_freep) Address *address = NULL;
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Address *existing_address;
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unsigned prefixlen;
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usec_t time_now;
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Address *existing_address, *a;
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Iterator i;
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int r;
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assert(link);
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@ -349,36 +391,39 @@ static int ndisc_router_process_autonomous_prefix(Link *link, sd_ndisc_router *r
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to get prefix address: %m");
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r = ndisc_router_generate_address(link, prefixlen, lifetime_preferred, address);
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r = ndisc_router_generate_addresses(link, prefixlen, lifetime_preferred, address, &addresses);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to generate SLAAC address: %m");
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return log_link_error_errno(link, r, "Failed to generate SLAAC addresses: %m");
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/* see RFC4862 section 5.5.3.e */
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r = address_get(link, address->family, &address->in_addr, address->prefixlen, &existing_address);
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if (r > 0) {
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lifetime_remaining = existing_address->cinfo.tstamp / 100 + existing_address->cinfo.ifa_valid - time_now / USEC_PER_SEC;
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if (lifetime_valid > NDISC_PREFIX_LFT_MIN || lifetime_valid > lifetime_remaining)
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address->cinfo.ifa_valid = lifetime_valid;
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else if (lifetime_remaining <= NDISC_PREFIX_LFT_MIN)
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address->cinfo.ifa_valid = lifetime_remaining;
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SET_FOREACH(a, addresses, i) {
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/* see RFC4862 section 5.5.3.e */
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r = address_get(link, a->family, &a->in_addr, a->prefixlen, &existing_address);
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if (r > 0) {
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lifetime_remaining = existing_address->cinfo.tstamp / 100 + existing_address->cinfo.ifa_valid - time_now / USEC_PER_SEC;
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if (lifetime_valid > NDISC_PREFIX_LFT_MIN || lifetime_valid > lifetime_remaining)
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a->cinfo.ifa_valid = lifetime_valid;
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else if (lifetime_remaining <= NDISC_PREFIX_LFT_MIN)
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a->cinfo.ifa_valid = lifetime_remaining;
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else
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a->cinfo.ifa_valid = NDISC_PREFIX_LFT_MIN;
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} else if (lifetime_valid > 0)
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a->cinfo.ifa_valid = lifetime_valid;
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else
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address->cinfo.ifa_valid = NDISC_PREFIX_LFT_MIN;
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} else if (lifetime_valid > 0)
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address->cinfo.ifa_valid = lifetime_valid;
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else
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return 0; /* see RFC4862 section 5.5.3.d */
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return 0; /* see RFC4862 section 5.5.3.d */
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if (address->cinfo.ifa_valid == 0)
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return 0;
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if (a->cinfo.ifa_valid == 0)
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continue;
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r = address_configure(address, link, ndisc_netlink_address_message_handler, true);
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if (r < 0) {
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log_link_warning_errno(link, r, "Could not set SLAAC address: %m");
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link_enter_failed(link);
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return r;
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r = address_configure(a, link, ndisc_netlink_address_message_handler, true);
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if (r < 0) {
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log_link_warning_errno(link, r, "Could not set SLAAC address: %m");
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link_enter_failed(link);
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return r;
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}
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if (r > 0)
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link->ndisc_messages++;
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}
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if (r > 0)
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link->ndisc_messages++;
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return 0;
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}
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@ -0,0 +1,7 @@
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[Match]
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Name=veth99
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[Network]
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IPv6AcceptRA=true
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IPv6Token=::1a:2b:3c:4d
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IPv6Token=::fa:de:ca:fe
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@ -2685,6 +2685,7 @@ class NetworkdRATests(unittest.TestCase, Utilities):
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'ipv6-prefix-veth.network',
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'ipv6-prefix-veth-token-static.network',
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'ipv6-prefix-veth-token-static-explicit.network',
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'ipv6-prefix-veth-token-static-multiple.network',
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'ipv6-prefix-veth-token-prefixstable.network']
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def setUp(self):
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@ -2728,6 +2729,16 @@ class NetworkdRATests(unittest.TestCase, Utilities):
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print(output)
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self.assertRegex(output, '2002:da8:1:0:1a:2b:3c:4d')
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def test_ipv6_token_static_multiple(self):
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copy_unit_to_networkd_unit_path('25-veth.netdev', 'ipv6-prefix.network', 'ipv6-prefix-veth-token-static-multiple.network')
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start_networkd()
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self.wait_online(['veth99:routable', 'veth-peer:degraded'])
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output = check_output(*networkctl_cmd, '-n', '0', 'status', 'veth99', env=env)
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print(output)
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self.assertRegex(output, '2002:da8:1:0:1a:2b:3c:4d')
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self.assertRegex(output, '2002:da8:1:0:fa:de:ca:fe')
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def test_ipv6_token_prefixstable(self):
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copy_unit_to_networkd_unit_path('25-veth.netdev', 'ipv6-prefix.network', 'ipv6-prefix-veth-token-prefixstable.network')
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start_networkd()
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