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Systemd/src/network/networkd-dhcp6.c
Susant Sahani 9efa8a3cff network: DHCPv6 Assign delegated prefix to LAN interface 
In DHCPv6-PD environment, where WAN interface requests IPv6 via DHCPv6,
receives the address as well as delegated prefixes, with LAN interfaces
serving those delegated prefixes in their router advertisement messages.
The LAN interfaces on the router themselves do not have
the IPv6 addresses assigned by networkd from the prefix it
serves on that interface. Now this patch enables it.
2020-05-29 16:20:37 +09:00

1071 lines
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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
Copyright © 2014 Intel Corporation. All rights reserved.
***/
#include <netinet/in.h>
#include <linux/if.h>
#include <linux/if_arp.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-dhcp6.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 Link *dhcp6_prefix_get(Manager *m, struct in6_addr *addr);
static int dhcp6_prefix_add(Manager *m, struct in6_addr *addr, Link *link);
static int dhcp6_prefix_remove_all(Manager *m, Link *link);
static bool dhcp6_link_has_dhcpv6_prefix(Link *link);
static int dhcp6_assign_delegated_prefix(Link *link, const struct in6_addr *prefix,
uint8_t prefix_len,
uint32_t lifetime_preferred,
uint32_t lifetime_valid);
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_has_preferred_subnet_id(Link *link) {
if (!link->network)
return false;
return link->network->router_prefix_subnet_id >= 0;
}
static int dhcp6_get_preferred_delegated_prefix(
Manager* manager,
Link *link,
const struct in6_addr *pd_prefix,
uint8_t pd_prefix_len,
struct in6_addr *ret_addr) {
int r;
union in_addr_union pd_prefix_union = {
.in6 = *pd_prefix,
};
int64_t subnet_id = link->network->router_prefix_subnet_id;
assert(pd_prefix_len <= 64);
uint8_t prefix_bits = 64 - pd_prefix_len;
uint64_t n_prefixes = UINT64_C(1) << prefix_bits;
_cleanup_free_ char *assigned_buf = NULL;
/* We start off with the original PD prefix we have been assigned and
* iterate from there */
union in_addr_union prefix = {
.in6 = *pd_prefix,
};
if (subnet_id >= 0) {
/* If the link has a preference for a particular subnet id try to allocate that */
if ((uint64_t)subnet_id >= n_prefixes)
return log_link_debug_errno(link,
SYNTHETIC_ERRNO(ERANGE),
"subnet id %" PRIi64 " is out of range. Only have %" PRIu64 " subnets.",
subnet_id,
n_prefixes);
r = in_addr_prefix_nth(AF_INET6, &prefix, 64, subnet_id);
if (r < 0)
return log_link_debug_errno(link,
r,
"subnet id %" PRIi64 " is out of range. Only have %" PRIu64 " subnets.",
subnet_id,
n_prefixes);
/* Verify that the prefix we did calculate fits in the pd prefix.
* This should not fail as we checked the prefix size beforehand */
assert_se(in_addr_prefix_covers(AF_INET6, &pd_prefix_union, pd_prefix_len, &prefix) > 0);
Link* assigned_link = dhcp6_prefix_get(manager, &prefix.in6);
(void) in_addr_to_string(AF_INET6, &prefix, &assigned_buf);
if (assigned_link && assigned_link != link)
return log_link_error_errno(link, SYNTHETIC_ERRNO(EAGAIN),
"The requested prefix %s is already assigned to another link: %s",
strnull(assigned_buf),
strnull(assigned_link->ifname));
*ret_addr = prefix.in6;
log_link_debug(link, "The requested prefix %s is available. Using it.",
strnull(assigned_buf));
return 0;
} else {
for (uint64_t n = 0; n < n_prefixes; n++) {
/* if we do not have an allocation preference just iterate
* through the address space and return the first free prefix. */
Link* assigned_link = dhcp6_prefix_get(manager, &prefix.in6);
if (!assigned_link || assigned_link == link) {
*ret_addr = prefix.in6;
return 0;
}
r = in_addr_prefix_next(AF_INET6, &prefix, 64);
if (r < 0)
return log_link_error_errno(link,
r,
"Can't allocate another prefix. Out of address space?");
}
log_link_warning(link, "Couldn't find a suitable prefix. Ran out of address space.");
}
return -ERANGE;
}
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 = dhcp6_prefix_add(link->manager, prefix, link);
if (r < 0)
return r;
if (link->network->dhcp6_pd_assign_prefix) {
r = dhcp6_assign_delegated_prefix(link, prefix, prefix_len, lifetime_preferred, lifetime_valid);
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);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_message_warning_errno(link, m, r, "Received error on unreachable route removal for DHCPv6 delegated subnet");
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;
_cleanup_(route_freep) Route *route = NULL;
if (pd_prefix_len >= 64)
continue;
(void) in_addr_to_string(AF_INET6, &pd_prefix, &buf);
r = route_new(&route);
if (r < 0)
return r;
route->family = AF_INET6;
route->dst = pd_prefix;
route->dst_prefixlen = pd_prefix_len;
route->type = 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,
struct in6_addr *pd_prefix,
uint8_t pd_prefix_len,
uint32_t lifetime_preferred,
uint32_t lifetime_valid,
bool assign_preferred_subnet_id) {
Iterator i;
Link *link;
Manager *manager = dhcp6_link->manager;
union in_addr_union prefix = {
.in6 = *pd_prefix,
};
uint64_t n_prefixes;
_cleanup_free_ char *buf = NULL;
_cleanup_free_ char *assigned_buf = NULL;
int r;
bool pool_depleted = false;
assert(manager);
assert(pd_prefix_len <= 64);
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);
HASHMAP_FOREACH(link, manager->links, i) {
union in_addr_union assigned_prefix;
if (link == dhcp6_link)
continue;
if (!dhcp6_get_prefix_delegation(link))
continue;
if (dhcp6_link_has_dhcpv6_prefix(link))
continue;
if (assign_preferred_subnet_id != dhcp6_has_preferred_subnet_id(link))
continue;
r = dhcp6_get_preferred_delegated_prefix(manager, link, &prefix.in6, pd_prefix_len,
&assigned_prefix.in6);
if (assign_preferred_subnet_id && r == -EAGAIN) {
/* A link has a preferred subnet_id but that one is
* already taken by another link. Now all the remaining
* links will also not obtain a prefix. */
pool_depleted = true;
continue;
} else if (r < 0)
return r;
(void) in_addr_to_string(AF_INET6, &assigned_prefix, &assigned_buf);
r = dhcp6_pd_prefix_assign(link, &assigned_prefix.in6, 64,
lifetime_preferred, lifetime_valid);
if (r < 0) {
log_link_error_errno(link, r, "Unable to assign/update prefix %s/64 from %s/%u for link: %m",
strnull(assigned_buf),
strnull(buf), pd_prefix_len);
} else
log_link_debug(link, "Assigned prefix %s/64 from %s/%u to link",
strnull(assigned_buf),
strnull(buf), pd_prefix_len);
}
/* If one of the link requests couldn't be fulfilled, signal that we
should try again with another prefix. */
if (pool_depleted)
return -EAGAIN;
return 0;
}
static int dhcp6_route_handler(sd_netlink *nl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST)
log_link_message_warning_errno(link, m, r, "Received error when adding unreachable route for DHCPv6 delegated subnet");
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;
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) {
_cleanup_(route_freep) Route *route = NULL;
r = route_new(&route);
if (r < 0)
return r;
route->family = AF_INET6;
route->dst = pd_prefix;
route->dst_prefixlen = pd_prefix_len;
route->table = link_get_dhcp_route_table(link);
route->type = 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");
/* We are doing prefix allocation in two steps:
* 1. all those links that have a preferred subnet id will be assigned their subnet
* 2. all those links that remain will receive prefixes in sequential
* order. Prefixes that were previously already allocated to another
* link will be skipped.
* If a subnet id request couldn't be fullfilled the failure will be logged (as error)
* and no further attempts at obtaining a prefix will be made.
* The assignment has to be split in two phases since subnet id
* preferences should be honored. Meaning that any subnet id should be
* handed out to the requesting link and not to some link that didn't
* specify any preference. */
r = dhcp6_pd_prefix_distribute(link, &pd_prefix.in6,
pd_prefix_len,
lifetime_preferred,
lifetime_valid,
true);
if (r < 0 && r != -EAGAIN)
return r;
/* if r == -EAGAIN then the allocation failed because we ran
* out of addresses for the preferred subnet id's. This doesn't
* mean we can't fullfill other prefix requests.
*
* Since we do not have dedicated lists of links that request
* specific subnet id's and those that accept any prefix we
* *must* reset the iterator to the start as otherwise some
* links might not get their requested prefix. */
r = dhcp6_pd_prefix_distribute(link, &pd_prefix.in6,
pd_prefix_len,
lifetime_preferred,
lifetime_valid,
false);
if (r < 0 && r != -EAGAIN)
return r;
/* If the prefix distribution did return -EAGAIN we will try to
* fullfill those with the next available pd delegated prefix. */
}
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);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_link_message_warning_errno(link, m, r, "Could not set DHCPv6 address");
link_enter_failed(link);
return 1;
} else if (r >= 0)
(void) manager_rtnl_process_address(rtnl, m, link->manager);
r = link_request_set_routes(link);
if (r < 0) {
link_enter_failed(link);
return 1;
}
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;
_cleanup_free_ char *buffer = NULL;
int r;
r = address_new(&addr);
if (r < 0)
return r;
addr->family = AF_INET6;
addr->in_addr.in6 = *ip6_addr;
addr->flags = IFA_F_NOPREFIXROUTE;
addr->prefixlen = 128;
addr->cinfo.ifa_prefered = lifetime_preferred;
addr->cinfo.ifa_valid = lifetime_valid;
(void) in_addr_to_string(addr->family, &addr->in_addr, &buffer);
log_link_info(link,
"DHCPv6 address %s/%d timeout preferred %d valid %d",
strnull(buffer), addr->prefixlen, lifetime_preferred, lifetime_valid);
r = address_configure(addr, link, dhcp6_address_handler, true);
if (r < 0)
return log_link_warning_errno(link, r, "Could not assign DHCPv6 address: %m");
return 0;
}
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) dhcp6_prefix_remove_all(link->manager, link);
link_dirty(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_dirty(link);
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;
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;
sd_dhcp6_option *send_option;
void *request_options;
const DUID *duid;
Iterator i;
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");
ORDERED_HASHMAP_FOREACH(send_option, link->network->dhcp6_client_send_options, i) {
r = sd_dhcp6_client_add_option(client, send_option);
if (r == -EEXIST)
continue;
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set option: %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");
}
if (link->network->dhcp6_mudurl) {
r = sd_dhcp6_client_set_request_mud_url(client, link->network->dhcp6_mudurl);
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set MUD URL: %m");
}
SET_FOREACH(request_options, link->network->dhcp6_request_options, i) {
uint32_t option = PTR_TO_UINT32(request_options);
r = sd_dhcp6_client_set_request_option(client, option);
if (r == -EEXIST) {
log_link_debug(link, "DHCP6 CLIENT: Failed to set request flag for '%u' already exists, ignoring.", option);
continue;
}
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set request flag for '%u': %m", option);
}
if (link->network->dhcp6_user_class) {
r = sd_dhcp6_client_set_request_user_class(client, link->network->dhcp6_user_class);
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set user class: %m");
}
if (link->network->dhcp6_vendor_class) {
r = sd_dhcp6_client_set_request_vendor_class(client, link->network->dhcp6_vendor_class);
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set vendor class: %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");
}
if (link->network->dhcp6_pd_length > 0) {
r = sd_dhcp6_client_set_prefix_delegation_hint(client, link->network->dhcp6_pd_length, &link->network->dhcp6_pd_address);
if (r < 0)
return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set prefix hint: %m");
}
link->dhcp6_client = TAKE_PTR(client);
return 0;
}
static Link *dhcp6_prefix_get(Manager *m, struct in6_addr *addr) {
assert_return(m, NULL);
assert_return(addr, NULL);
return hashmap_get(m->dhcp6_prefixes, addr);
}
static int dhcp6_route_add_handler(sd_netlink *nl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_link_message_warning_errno(link, m, r, "Received error adding DHCPv6 Prefix Delegation route");
link_enter_failed(link);
return 1;
}
return 1;
}
static int dhcp6_prefix_add(Manager *m, struct in6_addr *addr, Link *link) {
_cleanup_(route_freep) Route *route = NULL;
_cleanup_free_ struct in6_addr *a = NULL;
_cleanup_free_ char *buf = NULL;
Link *assigned_link;
int r;
assert_return(m, -EINVAL);
assert_return(addr, -EINVAL);
r = route_new(&route);
if (r < 0)
return r;
route->family = AF_INET6;
route->dst.in6 = *addr;
route->dst_prefixlen = 64;
r = route_configure(route, link, dhcp6_route_add_handler);
if (r < 0)
return r;
(void) in_addr_to_string(AF_INET6, (union in_addr_union *) addr, &buf);
log_link_debug(link, "Adding prefix route %s/64", strnull(buf));
assigned_link = hashmap_get(m->dhcp6_prefixes, addr);
if (assigned_link) {
assert(assigned_link == link);
return 0;
}
a = newdup(struct in6_addr, addr, 1);
if (!a)
return -ENOMEM;
r = hashmap_ensure_allocated(&m->dhcp6_prefixes, &in6_addr_hash_ops);
if (r < 0)
return r;
r = hashmap_put(m->dhcp6_prefixes, a, link);
if (r < 0)
return r;
TAKE_PTR(a);
link_ref(link);
return 0;
}
static int dhcp6_prefix_remove_handler(sd_netlink *nl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0) {
log_link_message_warning_errno(link, m, r, "Received error on DHCPv6 Prefix Delegation route removal");
link_enter_failed(link);
return 1;
}
return 1;
}
int dhcp6_prefix_remove(Manager *m, struct in6_addr *addr) {
_cleanup_free_ struct in6_addr *a = NULL;
_cleanup_(link_unrefp) Link *l = NULL;
_cleanup_(route_freep) Route *route = NULL;
_cleanup_free_ char *buf = NULL;
int r;
assert_return(m, -EINVAL);
assert_return(addr, -EINVAL);
l = hashmap_remove2(m->dhcp6_prefixes, addr, (void **) &a);
if (!l)
return -EINVAL;
(void) sd_radv_remove_prefix(l->radv, addr, 64);
r = route_new(&route);
if (r < 0)
return r;
route->family = AF_INET6;
route->dst.in6 = *addr;
route->dst_prefixlen = 64;
r = route_remove(route, l, dhcp6_prefix_remove_handler);
if (r < 0)
return r;
(void) in_addr_to_string(AF_INET6, (union in_addr_union *) addr, &buf);
log_link_debug(l, "Removing prefix route %s/64", strnull(buf));
return 0;
}
static int dhcp6_prefix_remove_all(Manager *m, Link *link) {
struct in6_addr *addr;
Iterator i;
Link *l;
assert_return(m, -EINVAL);
assert_return(link, -EINVAL);
HASHMAP_FOREACH_KEY(l, addr, m->dhcp6_prefixes, i)
if (l == link)
(void) dhcp6_prefix_remove(m, addr);
return 0;
}
static bool dhcp6_link_has_dhcpv6_prefix(Link *link) {
Iterator i;
Link *l;
assert(link);
assert(link->manager);
HASHMAP_FOREACH(l, link->manager->dhcp6_prefixes, i)
if (link == l)
return true;
return false;
}
static int dhcp6_assign_delegated_prefix(Link *link,
const struct in6_addr *prefix,
uint8_t prefix_len,
uint32_t lifetime_preferred,
uint32_t lifetime_valid) {
_cleanup_(address_freep) Address *address = NULL;
int r;
assert(link);
assert(link->network);
assert(prefix);
if (!link->network->dhcp6_pd_assign_prefix)
return 0;
r = address_new(&address);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate address: %m");
address->in_addr.in6 = *prefix;
r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to generate EUI64 address for DHCPv6 acquired delegated prefix: %m");
address->prefixlen = prefix_len;
address->family = AF_INET6;
address->cinfo.ifa_prefered = lifetime_preferred;
address->cinfo.ifa_valid = lifetime_valid;
link_set_state(link, LINK_STATE_CONFIGURING);
r = address_configure(address, link, address_handler, true);
if (r < 0)
return log_link_warning_errno(link, r, "Could not set addresses: %m");
if (r > 0)
link->address_messages++;
return 0;
}
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