314 lines
8.7 KiB
C
314 lines
8.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <netinet/in.h>
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#include <linux/if.h>
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#include "network-internal.h"
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#include "networkd-address.h"
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#include "networkd-ipv4ll.h"
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#include "networkd-link.h"
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#include "networkd-manager.h"
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#include "parse-util.h"
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static int ipv4ll_address_lost(Link *link) {
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_cleanup_(address_freep) Address *address = NULL;
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struct in_addr addr;
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int r;
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assert(link);
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link->ipv4ll_address_configured = false;
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r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
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if (r < 0)
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return 0;
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log_link_debug(link, "IPv4 link-local release "IPV4_ADDRESS_FMT_STR, IPV4_ADDRESS_FMT_VAL(addr));
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r = address_new(&address);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not allocate address: %m");
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address->family = AF_INET;
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address->in_addr.in = addr;
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address->prefixlen = 16;
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address->scope = RT_SCOPE_LINK;
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r = address_remove(address, link, NULL);
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if (r < 0)
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return r;
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link_check_ready(link);
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return 0;
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}
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static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
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int r;
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assert(link);
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assert(!link->ipv4ll_address_configured);
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r = sd_netlink_message_get_errno(m);
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if (r < 0 && r != -EEXIST) {
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log_link_message_warning_errno(link, m, r, "could not set ipv4ll address");
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link_enter_failed(link);
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return 1;
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} else if (r >= 0)
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(void) manager_rtnl_process_address(rtnl, m, link->manager);
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link->ipv4ll_address_configured = true;
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link_check_ready(link);
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return 1;
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}
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static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
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_cleanup_(address_freep) Address *ll_addr = NULL;
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struct in_addr address;
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int r;
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assert(ll);
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assert(link);
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link->ipv4ll_address_configured = false;
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r = sd_ipv4ll_get_address(ll, &address);
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if (r == -ENOENT)
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return 0;
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else if (r < 0)
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return r;
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log_link_debug(link, "IPv4 link-local claim "IPV4_ADDRESS_FMT_STR,
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IPV4_ADDRESS_FMT_VAL(address));
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r = address_new(&ll_addr);
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if (r < 0)
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return r;
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ll_addr->family = AF_INET;
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ll_addr->in_addr.in = address;
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ll_addr->prefixlen = 16;
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ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htobe32(0xfffffffflu >> ll_addr->prefixlen);
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ll_addr->scope = RT_SCOPE_LINK;
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r = address_configure(ll_addr, link, ipv4ll_address_handler, false, NULL);
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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 void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata) {
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Link *link = userdata;
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int r;
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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_IPV4LL_EVENT_STOP:
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r = ipv4ll_address_lost(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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break;
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case SD_IPV4LL_EVENT_CONFLICT:
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r = ipv4ll_address_lost(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 = sd_ipv4ll_restart(ll);
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if (r < 0)
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log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
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break;
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case SD_IPV4LL_EVENT_BIND:
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r = ipv4ll_address_claimed(ll, link);
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if (r < 0) {
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log_link_error(link, "Failed to configure ipv4ll address: %m");
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link_enter_failed(link);
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return;
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}
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break;
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default:
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log_link_warning(link, "IPv4 link-local unknown event: %d", event);
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break;
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}
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}
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static int ipv4ll_init(Link *link) {
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int r;
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assert(link);
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if (link->ipv4ll)
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return 0;
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r = sd_ipv4ll_new(&link->ipv4ll);
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if (r < 0)
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return r;
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r = sd_ipv4ll_attach_event(link->ipv4ll, link->manager->event, 0);
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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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int ipv4ll_configure(Link *link) {
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uint64_t seed;
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int r;
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assert(link);
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if (!link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4))
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return 0;
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r = ipv4ll_init(link);
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if (r < 0)
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return r;
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if (link->sd_device &&
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net_get_unique_predictable_data(link->sd_device, true, &seed) >= 0) {
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r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
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if (r < 0)
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return r;
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}
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r = sd_ipv4ll_set_mac(link->ipv4ll, &link->hw_addr.addr.ether);
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if (r < 0)
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return r;
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r = sd_ipv4ll_set_ifindex(link->ipv4ll, link->ifindex);
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if (r < 0)
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return r;
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r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link);
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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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int ipv4ll_update_mac(Link *link) {
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bool restart;
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int r;
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assert(link);
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if (!link->ipv4ll)
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return 0;
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restart = sd_ipv4ll_is_running(link->ipv4ll) > 0;
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r = sd_ipv4ll_stop(link->ipv4ll);
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if (r < 0)
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return r;
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r = sd_ipv4ll_set_mac(link->ipv4ll, &link->hw_addr.addr.ether);
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if (r < 0)
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return r;
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if (restart) {
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r = sd_ipv4ll_start(link->ipv4ll);
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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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int link_serialize_ipv4ll(Link *link, FILE *f) {
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struct in_addr address;
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int r;
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assert(link);
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if (!link->ipv4ll)
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return 0;
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r = sd_ipv4ll_get_address(link->ipv4ll, &address);
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if (r == -ENOENT)
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return 0;
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if (r < 0)
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return r;
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fputs("IPV4LL_ADDRESS=", f);
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serialize_in_addrs(f, &address, 1, false, NULL);
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fputc('\n', f);
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return 0;
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}
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int link_deserialize_ipv4ll(Link *link, const char *ipv4ll_address) {
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union in_addr_union address;
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int r;
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assert(link);
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if (isempty(ipv4ll_address))
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return 0;
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r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
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if (r < 0)
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return log_link_debug_errno(link, r, "Failed to parse IPv4LL address: %s", ipv4ll_address);
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r = ipv4ll_init(link);
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if (r < 0)
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return log_link_debug_errno(link, r, "Failed to initialize IPv4LL client: %m");
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r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
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if (r < 0)
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return log_link_debug_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
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return 0;
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}
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int config_parse_ipv4ll(
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const char* unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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AddressFamily *link_local = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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/* Note that this is mostly like
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* config_parse_address_family(), except that it
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* applies only to IPv4 */
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r = parse_boolean(rvalue);
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if (r < 0) {
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log_syntax(unit, LOG_WARNING, filename, line, r,
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"Failed to parse %s=%s, ignoring assignment. "
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"Note that the setting %s= is deprecated, please use LinkLocalAddressing= instead.",
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lvalue, rvalue, lvalue);
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return 0;
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}
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SET_FLAG(*link_local, ADDRESS_FAMILY_IPV4, r);
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log_syntax(unit, LOG_WARNING, filename, line, 0,
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"%s=%s is deprecated, please use LinkLocalAddressing=%s instead.",
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lvalue, rvalue, address_family_to_string(*link_local));
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return 0;
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}
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