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-rw-r--r--src/network/networkd-ndisc.c249
1 files changed, 249 insertions, 0 deletions
diff --git a/src/network/networkd-ndisc.c b/src/network/networkd-ndisc.c
new file mode 100644
index 0000000000..f2287be20a
--- /dev/null
+++ b/src/network/networkd-ndisc.c
@@ -0,0 +1,249 @@
+/***
+ This file is part of systemd.
+
+ Copyright (C) 2014 Intel Corporation. All rights reserved.
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <netinet/ether.h>
+#include <netinet/icmp6.h>
+#include <linux/if.h>
+
+#include "sd-ndisc.h"
+
+#include "networkd-link.h"
+
+static int ndisc_netlink_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(link);
+ assert(link->ndisc_messages > 0);
+
+ link->ndisc_messages --;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST) {
+ log_link_error_errno(link, r, "Could not set NDisc route or address: %m");
+ link_enter_failed(link);
+ }
+
+ if (link->ndisc_messages == 0) {
+ link->ndisc_configured = true;
+ link_check_ready(link);
+ }
+
+ return 1;
+}
+
+static void ndisc_prefix_autonomous_handler(sd_ndisc *nd, const struct in6_addr *prefix, unsigned prefixlen,
+ unsigned lifetime_preferred, unsigned lifetime_valid, void *userdata) {
+ _cleanup_address_free_ Address *address = NULL;
+ Link *link = userdata;
+ usec_t time_now;
+ int r;
+
+ assert(nd);
+ assert(link);
+ assert(link->network);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return;
+
+ r = address_new(&address);
+ if (r < 0) {
+ log_link_error_errno(link, r, "Could not allocate address: %m");
+ return;
+ }
+
+ assert_se(sd_event_now(link->manager->event, clock_boottime_or_monotonic(), &time_now) >= 0);
+
+ address->family = AF_INET6;
+ address->in_addr.in6 = *prefix;
+ 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.__in6_u.__u6_addr8[8] = link->mac.ether_addr_octet[0];
+ address->in_addr.in6.__in6_u.__u6_addr8[8] ^= 1 << 1;
+ address->in_addr.in6.__in6_u.__u6_addr8[9] = link->mac.ether_addr_octet[1];
+ address->in_addr.in6.__in6_u.__u6_addr8[10] = link->mac.ether_addr_octet[2];
+ address->in_addr.in6.__in6_u.__u6_addr8[11] = 0xff;
+ address->in_addr.in6.__in6_u.__u6_addr8[12] = 0xfe;
+ address->in_addr.in6.__in6_u.__u6_addr8[13] = link->mac.ether_addr_octet[3];
+ address->in_addr.in6.__in6_u.__u6_addr8[14] = link->mac.ether_addr_octet[4];
+ address->in_addr.in6.__in6_u.__u6_addr8[15] = link->mac.ether_addr_octet[5];
+ }
+ address->prefixlen = prefixlen;
+ address->flags = IFA_F_NOPREFIXROUTE|IFA_F_MANAGETEMPADDR;
+ address->cinfo.ifa_prefered = lifetime_preferred;
+ address->cinfo.ifa_valid = lifetime_valid;
+
+ r = address_configure(address, link, ndisc_netlink_handler, true);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Could not set SLAAC address: %m");
+ link_enter_failed(link);
+ return;
+ }
+
+ link->ndisc_messages ++;
+}
+
+static void ndisc_prefix_onlink_handler(sd_ndisc *nd, const struct in6_addr *prefix, unsigned prefixlen, unsigned lifetime, void *userdata) {
+ _cleanup_route_free_ Route *route = NULL;
+ Link *link = userdata;
+ usec_t time_now;
+ int r;
+
+ assert(nd);
+ assert(link);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return;
+
+ r = route_new(&route);
+ if (r < 0) {
+ log_link_error_errno(link, r, "Could not allocate route: %m");
+ return;
+ }
+
+ assert_se(sd_event_now(link->manager->event, clock_boottime_or_monotonic(), &time_now) >= 0);
+
+ route->family = AF_INET6;
+ route->table = RT_TABLE_MAIN;
+ route->protocol = RTPROT_RA;
+ route->flags = RTM_F_PREFIX;
+ route->dst.in6 = *prefix;
+ route->dst_prefixlen = prefixlen;
+ route->lifetime = time_now + lifetime * USEC_PER_SEC;
+
+ r = route_configure(route, link, ndisc_netlink_handler);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Could not set prefix route: %m");
+ link_enter_failed(link);
+ return;
+ }
+
+ link->ndisc_messages ++;
+}
+
+static void ndisc_router_handler(sd_ndisc *nd, uint8_t flags, const struct in6_addr *gateway, unsigned lifetime, int pref, void *userdata) {
+ _cleanup_route_free_ Route *route = NULL;
+ Link *link = userdata;
+ usec_t time_now;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->manager);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return;
+
+ if (flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER)) {
+ if (flags & ND_RA_FLAG_MANAGED)
+ dhcp6_request_address(link);
+
+ r = sd_dhcp6_client_start(link->dhcp6_client);
+ if (r < 0 && r != -EBUSY)
+ log_link_warning_errno(link, r, "Starting DHCPv6 client on NDisc request failed: %m");
+ }
+
+ if (!gateway)
+ return;
+
+ r = route_new(&route);
+ if (r < 0) {
+ log_link_error_errno(link, r, "Could not allocate route: %m");
+ return;
+ }
+
+ assert_se(sd_event_now(link->manager->event, clock_boottime_or_monotonic(), &time_now) >= 0);
+
+ route->family = AF_INET6;
+ route->table = RT_TABLE_MAIN;
+ route->protocol = RTPROT_RA;
+ route->pref = pref;
+ route->gw.in6 = *gateway;
+ route->lifetime = time_now + lifetime * USEC_PER_SEC;
+
+ r = route_configure(route, link, ndisc_netlink_handler);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Could not set default route: %m");
+ link_enter_failed(link);
+ return;
+ }
+
+ link->ndisc_messages ++;
+}
+
+static void ndisc_handler(sd_ndisc *nd, int event, void *userdata) {
+ Link *link = userdata;
+ int r;
+
+ assert(link);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return;
+
+ switch (event) {
+ case SD_NDISC_EVENT_TIMEOUT:
+ dhcp6_request_address(link);
+
+ r = sd_dhcp6_client_start(link->dhcp6_client);
+ if (r < 0 && r != -EBUSY)
+ log_link_warning_errno(link, r, "Starting DHCPv6 client after NDisc timeout failed: %m");
+
+ link->ndisc_configured = true;
+ link_check_ready(link);
+
+ break;
+ case SD_NDISC_EVENT_STOP:
+ break;
+ default:
+ log_link_warning(link, "IPv6 Neighbor Discovery unknown event: %d", event);
+ }
+}
+
+int ndisc_configure(Link *link) {
+ int r;
+
+ assert_return(link, -EINVAL);
+
+ r = sd_ndisc_new(&link->ndisc_router_discovery);
+ if (r < 0)
+ return r;
+
+ r = sd_ndisc_attach_event(link->ndisc_router_discovery, NULL, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_ndisc_set_mac(link->ndisc_router_discovery, &link->mac);
+ if (r < 0)
+ return r;
+
+ r = sd_ndisc_set_index(link->ndisc_router_discovery, link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_ndisc_set_callback(link->ndisc_router_discovery,
+ ndisc_router_handler,
+ ndisc_prefix_onlink_handler,
+ ndisc_prefix_autonomous_handler,
+ ndisc_handler,
+ link);
+
+ return r;
+}
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