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/***
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 <netinet/in.h>
#include <linux/if.h>
#include "sd-ndisc.h"
#include "networkd.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.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;
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);
assert(link->dhcp6_client);
assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
if (flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER)) {
/* (re)start DHCPv6 client in stateful or stateless mode according to RA flags */
r = dhcp6_request_address(link, flags & ND_RA_FLAG_MANAGED ? false : true);
if (r < 0 && r != -EBUSY)
log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease on NDisc request: %m");
else
log_link_debug(link, "Acquiring DHCPv6 lease on NDisc request");
}
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);
assert(link->dhcp6_client);
assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
switch (event) {
case SD_NDISC_EVENT_TIMEOUT:
/* (re)start DHCPv6 client in stateful mode */
r = dhcp6_request_address(link, false);
if (r < 0 && r != -EBUSY)
log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease after NDisc timeout: %m");
else
log_link_debug(link, "Acquiring DHCPv6 lease after NDisc timeout");
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_ifindex(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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