530 lines
16 KiB
C
530 lines
16 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright (C) 2014 Intel Corporation. All rights reserved.
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***/
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#include <netinet/ether.h>
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#include <linux/if.h>
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#include "sd-radv.h"
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#include "sd-dhcp6-client.h"
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#include "hashmap.h"
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#include "hostname-util.h"
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#include "network-internal.h"
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#include "networkd-link.h"
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#include "networkd-manager.h"
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#include "siphash24.h"
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#include "string-util.h"
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#include "radv-internal.h"
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static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link);
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static bool dhcp6_verify_link(Link *link) {
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if (!link->network) {
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log_link_info(link, "Link is not managed by us");
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return false;
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}
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if (!IN_SET(link->network->router_prefix_delegation,
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RADV_PREFIX_DELEGATION_DHCP6,
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RADV_PREFIX_DELEGATION_BOTH)) {
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log_link_debug(link, "Link does not request DHCPv6 prefix delegation");
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return false;
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}
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return true;
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}
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static bool dhcp6_enable_prefix_delegation(Link *dhcp6_link) {
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Manager *manager;
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Link *l;
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Iterator i;
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assert(dhcp6_link);
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manager = dhcp6_link->manager;
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assert(manager);
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HASHMAP_FOREACH(l, manager->links, i) {
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if (l == dhcp6_link)
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continue;
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if (!dhcp6_verify_link(l))
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continue;
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return true;
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}
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return false;
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}
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static int dhcp6_lease_information_acquired(sd_dhcp6_client *client,
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Link *link) {
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return 0;
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}
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static int dhcp6_pd_prefix_assign(Link *link, struct in6_addr *prefix,
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uint8_t prefix_len,
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uint32_t lifetime_preferred,
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uint32_t lifetime_valid) {
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sd_radv *radv = link->radv;
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int r;
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_cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL;
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r = sd_radv_prefix_new(&p);
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if (r < 0)
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return r;
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r = sd_radv_prefix_set_prefix(p, prefix, prefix_len);
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if (r < 0)
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return r;
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r = sd_radv_prefix_set_preferred_lifetime(p, lifetime_preferred);
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if (r < 0)
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return r;
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r = sd_radv_prefix_set_valid_lifetime(p, lifetime_valid);
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if (r < 0)
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return r;
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r = sd_radv_stop(radv);
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if (r < 0)
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return r;
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r = sd_radv_add_prefix(radv, p, true);
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if (r < 0 && r != -EEXIST)
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return r;
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r = manager_dhcp6_prefix_add(link->manager, &p->opt.in6_addr, link);
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if (r < 0)
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return r;
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return sd_radv_start(radv);
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}
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static Network *dhcp6_reset_pd_prefix_network(Link *link) {
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assert(link);
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assert(link->manager);
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assert(link->manager->networks);
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return link->manager->networks;
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}
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static int dhcp6_pd_prefix_distribute(Link *dhcp6_link, Iterator *i,
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struct in6_addr *pd_prefix,
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uint8_t pd_prefix_len,
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uint32_t lifetime_preferred,
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uint32_t lifetime_valid) {
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Link *link;
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Manager *manager = dhcp6_link->manager;
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union in_addr_union prefix;
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uint8_t n_prefixes, n_used = 0;
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_cleanup_free_ char *buf = NULL;
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int r;
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assert(manager);
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assert(pd_prefix_len <= 64);
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prefix.in6 = *pd_prefix;
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r = in_addr_mask(AF_INET6, &prefix, pd_prefix_len);
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if (r < 0)
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return r;
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n_prefixes = 1 << (64 - pd_prefix_len);
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(void) in_addr_to_string(AF_INET6, &prefix, &buf);
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log_link_debug(dhcp6_link, "Assigning up to %u prefixes from %s/%u",
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n_prefixes, strnull(buf), pd_prefix_len);
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while (hashmap_iterate(manager->links, i, (void **)&link, NULL)) {
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Link *assigned_link;
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if (n_used == n_prefixes) {
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log_link_debug(dhcp6_link, "Assigned %u/%u prefixes from %s/%u",
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n_used, n_prefixes, strnull(buf), pd_prefix_len);
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return -EAGAIN;
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}
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if (link == dhcp6_link)
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continue;
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if (!dhcp6_verify_link(link))
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continue;
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assigned_link = manager_dhcp6_prefix_get(manager, &prefix.in6);
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if (assigned_link != NULL && assigned_link != link)
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continue;
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r = dhcp6_pd_prefix_assign(link, &prefix.in6, 64,
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lifetime_preferred, lifetime_valid);
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if (r < 0) {
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log_link_error_errno(link, r, "Unable to %s prefix %s/%u for link: %m",
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assigned_link ? "update": "assign",
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strnull(buf), pd_prefix_len);
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if (assigned_link == NULL)
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continue;
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} else
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log_link_debug(link, "Assigned prefix %u/%u %s/64 to link",
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n_used + 1, n_prefixes, strnull(buf));
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n_used++;
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r = in_addr_prefix_next(AF_INET6, &prefix, pd_prefix_len);
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if (r < 0 && n_used < n_prefixes)
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return r;
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}
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if (n_used < n_prefixes) {
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Route *route;
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int n = n_used;
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r = route_new(&route);
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if (r < 0)
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return r;
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route->family = AF_INET6;
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while (n < n_prefixes) {
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route_update(route, &prefix, pd_prefix_len, NULL, NULL,
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0, 0, RTN_UNREACHABLE);
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r = route_configure(route, dhcp6_link, NULL);
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if (r < 0) {
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route_free(route);
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return r;
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}
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r = in_addr_prefix_next(AF_INET6, &prefix, pd_prefix_len);
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if (r < 0)
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return r;
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}
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}
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return n_used;
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}
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static int dhcp6_lease_pd_prefix_acquired(sd_dhcp6_client *client, Link *link) {
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int r;
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sd_dhcp6_lease *lease;
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struct in6_addr pd_prefix;
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uint8_t pd_prefix_len;
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uint32_t lifetime_preferred, lifetime_valid;
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_cleanup_free_ char *buf = NULL;
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Iterator i = ITERATOR_FIRST;
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r = sd_dhcp6_client_get_lease(client, &lease);
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if (r < 0)
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return r;
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(void) in_addr_to_string(AF_INET6, (union in_addr_union*) &pd_prefix, &buf);
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dhcp6_reset_pd_prefix_network(link);
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sd_dhcp6_lease_reset_pd_prefix_iter(lease);
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while (sd_dhcp6_lease_get_pd(lease, &pd_prefix, &pd_prefix_len,
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&lifetime_preferred,
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&lifetime_valid) >= 0) {
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if (pd_prefix_len > 64) {
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log_link_debug(link, "PD Prefix length > 64, ignoring prefix %s/%u",
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strnull(buf), pd_prefix_len);
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continue;
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}
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r = dhcp6_pd_prefix_distribute(link, &i, &pd_prefix,
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pd_prefix_len,
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lifetime_preferred,
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lifetime_valid);
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if (r < 0 && r != -EAGAIN)
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return r;
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if (r >= 0)
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i = ITERATOR_FIRST;
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}
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return 0;
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}
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static int dhcp6_address_handler(sd_netlink *rtnl, sd_netlink_message *m,
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void *userdata) {
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_cleanup_(link_unrefp) Link *link = userdata;
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int r;
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assert(link);
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r = sd_netlink_message_get_errno(m);
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if (r < 0 && r != -EEXIST) {
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if (link->rtnl_extended_attrs) {
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log_link_warning(link, "Could not set extended netlink attributes, reverting to fallback mechanism");
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link->rtnl_extended_attrs = false;
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dhcp6_lease_address_acquired(link->dhcp6_client, link);
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return 1;
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}
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log_link_error_errno(link, r, "Could not set DHCPv6 address: %m");
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link_enter_failed(link);
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} else if (r >= 0)
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manager_rtnl_process_address(rtnl, m, link->manager);
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return 1;
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}
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static int dhcp6_address_change(
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Link *link,
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struct in6_addr *ip6_addr,
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uint32_t lifetime_preferred,
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uint32_t lifetime_valid) {
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_cleanup_(address_freep) Address *addr = NULL;
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char buffer[INET6_ADDRSTRLEN];
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int r;
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r = address_new(&addr);
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if (r < 0)
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return r;
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addr->family = AF_INET6;
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memcpy(&addr->in_addr.in6, ip6_addr, sizeof(*ip6_addr));
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addr->flags = IFA_F_NOPREFIXROUTE;
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addr->prefixlen = 128;
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addr->cinfo.ifa_prefered = lifetime_preferred;
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addr->cinfo.ifa_valid = lifetime_valid;
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log_link_info(link,
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"DHCPv6 address %s/%d timeout preferred %d valid %d",
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inet_ntop(AF_INET6, &addr->in_addr.in6, buffer, sizeof(buffer)),
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addr->prefixlen, lifetime_preferred, lifetime_valid);
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r = address_configure(addr, link, dhcp6_address_handler, true);
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if (r < 0)
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log_link_warning_errno(link, r, "Could not assign DHCPv6 address: %m");
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return r;
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}
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static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link) {
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int r;
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sd_dhcp6_lease *lease;
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struct in6_addr ip6_addr;
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uint32_t lifetime_preferred, lifetime_valid;
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r = sd_dhcp6_client_get_lease(client, &lease);
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if (r < 0)
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return r;
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sd_dhcp6_lease_reset_address_iter(lease);
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while (sd_dhcp6_lease_get_address(lease, &ip6_addr,
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&lifetime_preferred,
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&lifetime_valid) >= 0) {
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r = dhcp6_address_change(link, &ip6_addr, lifetime_preferred, lifetime_valid);
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if (r < 0)
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return r;
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}
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return 0;
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}
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static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) {
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int r;
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Link *link = userdata;
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assert(link);
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assert(link->network);
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if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
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return;
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switch(event) {
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case SD_DHCP6_CLIENT_EVENT_STOP:
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case SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE:
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case SD_DHCP6_CLIENT_EVENT_RETRANS_MAX:
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if (sd_dhcp6_client_get_lease(client, NULL) >= 0)
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log_link_warning(link, "DHCPv6 lease lost");
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(void) manager_dhcp6_prefix_remove_all(link->manager, link);
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link->dhcp6_configured = false;
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break;
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case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE:
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r = dhcp6_lease_address_acquired(client, link);
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if (r < 0) {
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link_enter_failed(link);
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return;
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}
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r = dhcp6_lease_pd_prefix_acquired(client, link);
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if (r < 0)
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log_link_debug(link, "DHCPv6 did not receive prefixes to delegate");
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_fallthrough_;
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case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST:
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r = dhcp6_lease_information_acquired(client, link);
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if (r < 0) {
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link_enter_failed(link);
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return;
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}
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link->dhcp6_configured = true;
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break;
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default:
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if (event < 0)
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log_link_warning_errno(link, event, "DHCPv6 error: %m");
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else
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log_link_warning(link, "DHCPv6 unknown event: %d", event);
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return;
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}
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link_check_ready(link);
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}
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int dhcp6_request_address(Link *link, int ir) {
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int r, inf_req;
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bool running;
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assert(link);
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assert(link->dhcp6_client);
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assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
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r = sd_dhcp6_client_is_running(link->dhcp6_client);
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if (r < 0)
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return r;
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else
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running = r;
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if (running) {
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r = sd_dhcp6_client_get_information_request(link->dhcp6_client, &inf_req);
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if (r < 0)
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return r;
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if (inf_req == ir)
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return 0;
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r = sd_dhcp6_client_stop(link->dhcp6_client);
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if (r < 0)
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return r;
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} else {
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r = sd_dhcp6_client_set_local_address(link->dhcp6_client, &link->ipv6ll_address);
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if (r < 0)
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return r;
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}
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r = sd_dhcp6_client_set_information_request(link->dhcp6_client, ir);
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if (r < 0)
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return r;
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r = sd_dhcp6_client_start(link->dhcp6_client);
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if (r < 0)
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return r;
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return 0;
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}
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static int dhcp6_set_hostname(sd_dhcp6_client *client, Link *link) {
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_cleanup_free_ char *hostname = NULL;
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const char *hn;
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int r;
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assert(link);
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if (!link->network->dhcp_send_hostname)
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hn = NULL;
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else if (link->network->dhcp_hostname)
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hn = link->network->dhcp_hostname;
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else {
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r = gethostname_strict(&hostname);
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if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */
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return r;
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hn = hostname;
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}
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return sd_dhcp6_client_set_fqdn(client, hn);
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}
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int dhcp6_configure(Link *link) {
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sd_dhcp6_client *client = NULL;
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const DUID *duid;
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int r;
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assert(link);
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assert(link->network);
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if (link->dhcp6_client)
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return 0;
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r = sd_dhcp6_client_new(&client);
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if (r < 0)
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return r;
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r = sd_dhcp6_client_attach_event(client, NULL, 0);
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if (r < 0)
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goto error;
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r = sd_dhcp6_client_set_mac(client,
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(const uint8_t *) &link->mac,
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sizeof (link->mac), ARPHRD_ETHER);
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if (r < 0)
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goto error;
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r = sd_dhcp6_client_set_iaid(client, link->network->iaid);
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if (r < 0)
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goto error;
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duid = link_duid(link);
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r = sd_dhcp6_client_set_duid(client,
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duid->type,
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duid->raw_data_len > 0 ? duid->raw_data : NULL,
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duid->raw_data_len);
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if (r < 0)
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goto error;
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r = dhcp6_set_hostname(client, link);
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if (r < 0)
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goto error;
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r = sd_dhcp6_client_set_ifindex(client, link->ifindex);
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if (r < 0)
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goto error;
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if (link->network->rapid_commit) {
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r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_RAPID_COMMIT);
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if (r < 0)
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goto error;
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}
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r = sd_dhcp6_client_set_callback(client, dhcp6_handler, link);
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if (r < 0)
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goto error;
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if (dhcp6_enable_prefix_delegation(link)) {
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r = sd_dhcp6_client_set_prefix_delegation(client, true);
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if (r < 0)
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goto error;
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}
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link->dhcp6_client = client;
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return 0;
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error:
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sd_dhcp6_client_unref(client);
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return r;
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}
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