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Systemd/src/network/networkd-dhcp6.c

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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
Copyright © 2014 Intel Corporation. All rights reserved.
***/
#include <netinet/ether.h>
#include <linux/if.h>
#include "sd-radv.h"
#include "sd-dhcp6-client.h"
#include "hashmap.h"
#include "hostname-util.h"
#include "missing_network.h"
#include "network-internal.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "siphash24.h"
#include "string-util.h"
#include "radv-internal.h"
static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link);
static bool dhcp6_get_prefix_delegation(Link *link) {
if (!link->network)
return false;
return IN_SET(link->network->router_prefix_delegation,
RADV_PREFIX_DELEGATION_DHCP6,
RADV_PREFIX_DELEGATION_BOTH);
}
static bool dhcp6_enable_prefix_delegation(Link *dhcp6_link) {
Manager *manager;
Link *l;
Iterator i;
assert(dhcp6_link);
manager = dhcp6_link->manager;
assert(manager);
HASHMAP_FOREACH(l, manager->links, i) {
if (l == dhcp6_link)
continue;
if (!dhcp6_get_prefix_delegation(l))
continue;
return true;
}
return false;
}
static int dhcp6_lease_information_acquired(sd_dhcp6_client *client,
Link *link) {
return 0;
}
static int dhcp6_pd_prefix_assign(Link *link, struct in6_addr *prefix,
uint8_t prefix_len,
uint32_t lifetime_preferred,
uint32_t lifetime_valid) {
sd_radv *radv = link->radv;
int r;
_cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL;
r = sd_radv_prefix_new(&p);
if (r < 0)
return r;
r = sd_radv_prefix_set_prefix(p, prefix, prefix_len);
if (r < 0)
return r;
r = sd_radv_prefix_set_preferred_lifetime(p, lifetime_preferred);
if (r < 0)
return r;
r = sd_radv_prefix_set_valid_lifetime(p, lifetime_valid);
if (r < 0)
return r;
r = sd_radv_stop(radv);
if (r < 0)
return r;
r = sd_radv_add_prefix(radv, p, true);
if (r < 0 && r != -EEXIST)
return r;
r = manager_dhcp6_prefix_add(link->manager, prefix, link);
if (r < 0)
return r;
return sd_radv_start(radv);
}
static int dhcp6_route_remove_handler(sd_netlink *nl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_debug_errno(link, r, "Received error on unreachable route removal for DHCPv6 delegated subnetl: %m");
return 1;
}
int dhcp6_lease_pd_prefix_lost(sd_dhcp6_client *client, Link* link) {
int r;
sd_dhcp6_lease *lease;
union in_addr_union pd_prefix;
uint8_t pd_prefix_len;
uint32_t lifetime_preferred, lifetime_valid;
r = sd_dhcp6_client_get_lease(client, &lease);
if (r < 0)
return r;
sd_dhcp6_lease_reset_pd_prefix_iter(lease);
while (sd_dhcp6_lease_get_pd(lease, &pd_prefix.in6, &pd_prefix_len,
&lifetime_preferred,
&lifetime_valid) >= 0) {
_cleanup_free_ char *buf = NULL;
Route *route;
if (pd_prefix_len >= 64)
continue;
(void) in_addr_to_string(AF_INET6, &pd_prefix, &buf);
r = route_add(link, AF_INET6, &pd_prefix, pd_prefix_len, 0, 0, 0, &route);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to add unreachable route to delete for DHCPv6 delegated subnet %s/%u: %m",
strnull(buf),
pd_prefix_len);
continue;
}
route_update(route, NULL, 0, NULL, NULL, 0, 0, RTN_UNREACHABLE);
r = route_remove(route, link, dhcp6_route_remove_handler);
if (r < 0) {
log_link_warning_errno(link, r, "Cannot delete unreachable route for DHCPv6 delegated subnet %s/%u: %m",
strnull(buf),
pd_prefix_len);
continue;
}
log_link_debug(link, "Removing unreachable route %s/%u",
strnull(buf), pd_prefix_len);
}
return 0;
}
static int dhcp6_pd_prefix_distribute(Link *dhcp6_link, Iterator *i,
struct in6_addr *pd_prefix,
uint8_t pd_prefix_len,
uint32_t lifetime_preferred,
uint32_t lifetime_valid) {
Link *link;
Manager *manager = dhcp6_link->manager;
union in_addr_union prefix;
uint64_t n_prefixes, n_used = 0;
_cleanup_free_ char *buf = NULL;
_cleanup_free_ char *assigned_buf = NULL;
int r;
assert(manager);
assert(pd_prefix_len <= 64);
prefix.in6 = *pd_prefix;
r = in_addr_mask(AF_INET6, &prefix, pd_prefix_len);
if (r < 0)
return r;
n_prefixes = UINT64_C(1) << (64 - pd_prefix_len);
(void) in_addr_to_string(AF_INET6, &prefix, &buf);
log_link_debug(dhcp6_link, "Assigning up to %" PRIu64 " prefixes from %s/%u",
n_prefixes, strnull(buf), pd_prefix_len);
while (hashmap_iterate(manager->links, i, (void **)&link, NULL)) {
Link *assigned_link;
if (n_used == n_prefixes) {
log_link_debug(dhcp6_link, "Assigned %" PRIu64 "/%" PRIu64 " prefixes from %s/%u",
n_used, n_prefixes, strnull(buf), pd_prefix_len);
return -EAGAIN;
}
if (link == dhcp6_link)
continue;
if (!dhcp6_get_prefix_delegation(link))
continue;
assigned_link = manager_dhcp6_prefix_get(manager, &prefix.in6);
if (assigned_link && assigned_link != link)
continue;
(void) in_addr_to_string(AF_INET6, &prefix, &assigned_buf);
r = dhcp6_pd_prefix_assign(link, &prefix.in6, 64,
lifetime_preferred, lifetime_valid);
if (r < 0) {
log_link_error_errno(link, r, "Unable to %s prefix %s/64 from %s/%u for link: %m",
assigned_link ? "update": "assign",
strnull(assigned_buf),
strnull(buf), pd_prefix_len);
if (!assigned_link)
continue;
} else
log_link_debug(link, "Assigned prefix %" PRIu64 "/%" PRIu64 " %s/64 from %s/%u to link",
n_used + 1, n_prefixes,
strnull(assigned_buf),
strnull(buf), pd_prefix_len);
n_used++;
r = in_addr_prefix_next(AF_INET6, &prefix, 64);
if (r < 0 && n_used < n_prefixes)
return r;
}
return 0;
}
static int dhcp6_route_handler(sd_netlink *nl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST)
log_link_debug_errno(link, r, "Received error when adding unreachable route for DHCPv6 delegated subnet: %m");
return 1;
}
static int dhcp6_lease_pd_prefix_acquired(sd_dhcp6_client *client, Link *link) {
int r;
sd_dhcp6_lease *lease;
union in_addr_union pd_prefix;
uint8_t pd_prefix_len;
uint32_t lifetime_preferred, lifetime_valid;
Iterator i = ITERATOR_FIRST;
r = sd_dhcp6_client_get_lease(client, &lease);
if (r < 0)
return r;
sd_dhcp6_lease_reset_pd_prefix_iter(lease);
while (sd_dhcp6_lease_get_pd(lease, &pd_prefix.in6, &pd_prefix_len,
&lifetime_preferred,
&lifetime_valid) >= 0) {
_cleanup_free_ char *buf = NULL;
(void) in_addr_to_string(AF_INET6, &pd_prefix, &buf);
if (pd_prefix_len > 64) {
log_link_debug(link, "PD Prefix length > 64, ignoring prefix %s/%u",
strnull(buf), pd_prefix_len);
continue;
}
if (pd_prefix_len < 48)
log_link_warning(link, "PD Prefix length < 48, looks unusual %s/%u",
strnull(buf), pd_prefix_len);
if (pd_prefix_len < 64) {
uint32_t table;
Route *route;
table = link_get_dhcp_route_table(link);
r = route_add(link, AF_INET6, &pd_prefix, pd_prefix_len, 0, 0, table, &route);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to add unreachable route for DHCPv6 delegated subnet %s/%u: %m",
strnull(buf),
pd_prefix_len);
continue;
}
route_update(route, NULL, 0, NULL, NULL, 0, 0, RTN_UNREACHABLE);
r = route_configure(route, link, dhcp6_route_handler);
if (r < 0) {
log_link_warning_errno(link, r, "Cannot configure unreachable route for delegated subnet %s/%u: %m",
strnull(buf),
pd_prefix_len);
continue;
}
log_link_debug(link, "Configuring unreachable route for %s/%u",
strnull(buf), pd_prefix_len);
} else
log_link_debug(link, "Not adding a blocking route since distributed prefix is /64");
r = dhcp6_pd_prefix_distribute(link, &i, &pd_prefix.in6,
pd_prefix_len,
lifetime_preferred,
lifetime_valid);
if (r < 0 && r != -EAGAIN)
return r;
if (r >= 0)
i = ITERATOR_FIRST;
}
return 0;
}
int dhcp6_request_prefix_delegation(Link *link) {
Link *l;
Iterator i;
assert_return(link, -EINVAL);
assert_return(link->manager, -EOPNOTSUPP);
if (dhcp6_get_prefix_delegation(link) <= 0)
return 0;
log_link_debug(link, "Requesting DHCPv6 prefixes to be delegated for new link");
HASHMAP_FOREACH(l, link->manager->links, i) {
int r, enabled;
if (l == link)
continue;
if (!l->dhcp6_client)
continue;
r = sd_dhcp6_client_get_prefix_delegation(l->dhcp6_client, &enabled);
if (r < 0) {
log_link_warning_errno(l, r, "Cannot get prefix delegation when adding new link");
continue;
}
if (enabled == 0) {
r = sd_dhcp6_client_set_prefix_delegation(l->dhcp6_client, 1);
if (r < 0) {
log_link_warning_errno(l, r, "Cannot enable prefix delegation when adding new link");
continue;
}
}
r = sd_dhcp6_client_is_running(l->dhcp6_client);
if (r <= 0)
continue;
if (enabled != 0) {
log_link_debug(l, "Requesting re-assignment of delegated prefixes after adding new link");
(void) dhcp6_lease_pd_prefix_acquired(l->dhcp6_client, l);
continue;
}
r = sd_dhcp6_client_stop(l->dhcp6_client);
if (r < 0) {
log_link_warning_errno(l, r, "Cannot stop DHCPv6 prefix delegation client after adding new link");
continue;
}
r = sd_dhcp6_client_start(l->dhcp6_client);
if (r < 0) {
log_link_warning_errno(l, r, "Cannot restart DHCPv6 prefix delegation client after adding new link");
continue;
}
log_link_debug(l, "Restarted DHCPv6 client to acquire prefix delegations after adding new link");
}
return 0;
}
static int dhcp6_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
if (link->rtnl_extended_attrs) {
log_link_warning(link, "Could not set extended netlink attributes, reverting to fallback mechanism");
link->rtnl_extended_attrs = false;
dhcp6_lease_address_acquired(link->dhcp6_client, link);
return 1;
}
log_link_error_errno(link, r, "Could not set DHCPv6 address: %m");
link_enter_failed(link);
} else if (r >= 0)
manager_rtnl_process_address(rtnl, m, link->manager);
return 1;
}
static int dhcp6_address_change(
Link *link,
struct in6_addr *ip6_addr,
uint32_t lifetime_preferred,
uint32_t lifetime_valid) {
_cleanup_(address_freep) Address *addr = NULL;
char buffer[INET6_ADDRSTRLEN];
int r;
r = address_new(&addr);
if (r < 0)
return r;
addr->family = AF_INET6;
memcpy(&addr->in_addr.in6, ip6_addr, sizeof(*ip6_addr));
addr->flags = IFA_F_NOPREFIXROUTE;
addr->prefixlen = 128;
addr->cinfo.ifa_prefered = lifetime_preferred;
addr->cinfo.ifa_valid = lifetime_valid;
log_link_info(link,
"DHCPv6 address %s/%d timeout preferred %d valid %d",
inet_ntop(AF_INET6, &addr->in_addr.in6, buffer, sizeof(buffer)),
addr->prefixlen, lifetime_preferred, lifetime_valid);
r = address_configure(addr, link, dhcp6_address_handler, true);
if (r < 0)
log_link_warning_errno(link, r, "Could not assign DHCPv6 address: %m");
return r;
}
static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link) {
int r;
sd_dhcp6_lease *lease;
struct in6_addr ip6_addr;
uint32_t lifetime_preferred, lifetime_valid;
r = sd_dhcp6_client_get_lease(client, &lease);
if (r < 0)
return r;
sd_dhcp6_lease_reset_address_iter(lease);
while (sd_dhcp6_lease_get_address(lease, &ip6_addr,
&lifetime_preferred,
&lifetime_valid) >= 0) {
r = dhcp6_address_change(link, &ip6_addr, lifetime_preferred, lifetime_valid);
if (r < 0)
return r;
}
return 0;
}
static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) {
int r;
Link *link = userdata;
assert(link);
assert(link->network);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
switch(event) {
case SD_DHCP6_CLIENT_EVENT_STOP:
case SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE:
case SD_DHCP6_CLIENT_EVENT_RETRANS_MAX:
if (sd_dhcp6_client_get_lease(client, NULL) >= 0)
log_link_warning(link, "DHCPv6 lease lost");
(void) dhcp6_lease_pd_prefix_lost(client, link);
(void) manager_dhcp6_prefix_remove_all(link->manager, link);
link->dhcp6_configured = false;
break;
case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE:
r = dhcp6_lease_address_acquired(client, link);
if (r < 0) {
link_enter_failed(link);
return;
}
r = dhcp6_lease_pd_prefix_acquired(client, link);
if (r < 0)
log_link_debug(link, "DHCPv6 did not receive prefixes to delegate");
_fallthrough_;
case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST:
r = dhcp6_lease_information_acquired(client, link);
if (r < 0) {
link_enter_failed(link);
return;
}
link->dhcp6_configured = true;
break;
default:
if (event < 0)
log_link_warning_errno(link, event, "DHCPv6 error: %m");
else
log_link_warning(link, "DHCPv6 unknown event: %d", event);
return;
}
link_check_ready(link);
}
int dhcp6_request_address(Link *link, int ir) {
int r, inf_req, pd;
bool running;
assert(link);
assert(link->dhcp6_client);
assert(link->network);
assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
r = sd_dhcp6_client_is_running(link->dhcp6_client);
if (r < 0)
return r;
else
running = r;
r = sd_dhcp6_client_get_prefix_delegation(link->dhcp6_client, &pd);
if (r < 0)
return r;
if (pd && ir && link->network->dhcp6_force_pd_other_information) {
log_link_debug(link, "Enabling managed mode to request DHCPv6 PD with 'Other Information' set");
r = sd_dhcp6_client_set_address_request(link->dhcp6_client,
false);
if (r < 0 )
return r;
ir = false;
}
if (running) {
r = sd_dhcp6_client_get_information_request(link->dhcp6_client, &inf_req);
if (r < 0)
return r;
if (inf_req == ir)
return 0;
r = sd_dhcp6_client_stop(link->dhcp6_client);
if (r < 0)
return r;
} else {
r = sd_dhcp6_client_set_local_address(link->dhcp6_client, &link->ipv6ll_address);
if (r < 0)
return r;
}
r = sd_dhcp6_client_set_information_request(link->dhcp6_client, ir);
if (r < 0)
return r;
r = sd_dhcp6_client_start(link->dhcp6_client);
if (r < 0)
return r;
return 0;
}
static int dhcp6_set_hostname(sd_dhcp6_client *client, Link *link) {
_cleanup_free_ char *hostname = NULL;
const char *hn;
int r;
assert(link);
if (!link->network->dhcp_send_hostname)
hn = NULL;
else if (link->network->dhcp_hostname)
hn = link->network->dhcp_hostname;
else {
r = gethostname_strict(&hostname);
if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */
return r;
hn = hostname;
}
r = sd_dhcp6_client_set_fqdn(client, hn);
if (r == -EINVAL && hostname)
/* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */
log_link_warning_errno(link, r, "DHCP6 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m");
else if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set hostname: %m");
return 0;
}
int dhcp6_configure(Link *link) {
_cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL;
const DUID *duid;
int r;
assert(link);
assert(link->network);
if (link->dhcp6_client)
return 0;
r = sd_dhcp6_client_new(&client);
if (r == -ENOMEM)
return log_oom();
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to create DHCP6 client: %m");
r = sd_dhcp6_client_attach_event(client, NULL, 0);
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to attach event: %m");
r = sd_dhcp6_client_set_mac(client,
(const uint8_t *) &link->mac,
sizeof (link->mac), ARPHRD_ETHER);
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set MAC address: %m");
if (link->network->iaid_set) {
r = sd_dhcp6_client_set_iaid(client, link->network->iaid);
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set IAID: %m");
}
duid = link_get_duid(link);
if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
r = sd_dhcp6_client_set_duid_llt(client, duid->llt_time);
else
r = sd_dhcp6_client_set_duid(client,
duid->type,
duid->raw_data_len > 0 ? duid->raw_data : NULL,
duid->raw_data_len);
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set DUID: %m");
r = dhcp6_set_hostname(client, link);
if (r < 0)
return r;
r = sd_dhcp6_client_set_ifindex(client, link->ifindex);
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set ifindex: %m");
if (link->network->rapid_commit) {
r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_RAPID_COMMIT);
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set request flag for rapid commit: %m");
}
r = sd_dhcp6_client_set_callback(client, dhcp6_handler, link);
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set callback: %m");
if (dhcp6_enable_prefix_delegation(link)) {
r = sd_dhcp6_client_set_prefix_delegation(client, true);
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set prefix delegation: %m");
}
link->dhcp6_client = TAKE_PTR(client);
return 0;
}
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