| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <netinet/in.h> |
| #include <linux/if.h> |
| |
| #include "network-internal.h" |
| #include "networkd-address.h" |
| #include "networkd-ipv4ll.h" |
| #include "networkd-link.h" |
| #include "networkd-manager.h" |
| #include "parse-util.h" |
| |
| static int ipv4ll_address_lost(Link *link) { |
| _cleanup_(address_freep) Address *address = NULL; |
| struct in_addr addr; |
| int r; |
| |
| assert(link); |
| |
| link->ipv4ll_address_configured = false; |
| |
| r = sd_ipv4ll_get_address(link->ipv4ll, &addr); |
| if (r < 0) |
| return 0; |
| |
| log_link_debug(link, "IPv4 link-local release "IPV4_ADDRESS_FMT_STR, IPV4_ADDRESS_FMT_VAL(addr)); |
| |
| r = address_new(&address); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not allocate address: %m"); |
| |
| address->family = AF_INET; |
| address->in_addr.in = addr; |
| address->prefixlen = 16; |
| address->scope = RT_SCOPE_LINK; |
| |
| r = address_remove(address, link, NULL); |
| if (r < 0) |
| return r; |
| |
| link_check_ready(link); |
| |
| return 0; |
| } |
| |
| static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
| int r; |
| |
| assert(link); |
| assert(!link->ipv4ll_address_configured); |
| |
| r = sd_netlink_message_get_errno(m); |
| if (r < 0 && r != -EEXIST) { |
| log_link_message_warning_errno(link, m, r, "could not set ipv4ll address"); |
| link_enter_failed(link); |
| return 1; |
| } else if (r >= 0) |
| (void) manager_rtnl_process_address(rtnl, m, link->manager); |
| |
| link->ipv4ll_address_configured = true; |
| link_check_ready(link); |
| |
| return 1; |
| } |
| |
| static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) { |
| _cleanup_(address_freep) Address *ll_addr = NULL; |
| struct in_addr address; |
| int r; |
| |
| assert(ll); |
| assert(link); |
| |
| link->ipv4ll_address_configured = false; |
| |
| r = sd_ipv4ll_get_address(ll, &address); |
| if (r == -ENOENT) |
| return 0; |
| else if (r < 0) |
| return r; |
| |
| log_link_debug(link, "IPv4 link-local claim "IPV4_ADDRESS_FMT_STR, |
| IPV4_ADDRESS_FMT_VAL(address)); |
| |
| r = address_new(&ll_addr); |
| if (r < 0) |
| return r; |
| |
| ll_addr->family = AF_INET; |
| ll_addr->in_addr.in = address; |
| ll_addr->prefixlen = 16; |
| ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htobe32(0xfffffffflu >> ll_addr->prefixlen); |
| ll_addr->scope = RT_SCOPE_LINK; |
| |
| r = address_configure(ll_addr, link, ipv4ll_address_handler, false, NULL); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| |
| if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) |
| return; |
| |
| switch(event) { |
| case SD_IPV4LL_EVENT_STOP: |
| r = ipv4ll_address_lost(link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| break; |
| case SD_IPV4LL_EVENT_CONFLICT: |
| r = ipv4ll_address_lost(link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| |
| r = sd_ipv4ll_restart(ll); |
| if (r < 0) |
| log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m"); |
| break; |
| case SD_IPV4LL_EVENT_BIND: |
| r = ipv4ll_address_claimed(ll, link); |
| if (r < 0) { |
| log_link_error(link, "Failed to configure ipv4ll address: %m"); |
| link_enter_failed(link); |
| return; |
| } |
| break; |
| default: |
| log_link_warning(link, "IPv4 link-local unknown event: %d", event); |
| break; |
| } |
| } |
| |
| static int ipv4ll_init(Link *link) { |
| int r; |
| |
| assert(link); |
| |
| if (link->ipv4ll) |
| return 0; |
| |
| r = sd_ipv4ll_new(&link->ipv4ll); |
| if (r < 0) |
| return r; |
| |
| r = sd_ipv4ll_attach_event(link->ipv4ll, link->manager->event, 0); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int ipv4ll_configure(Link *link) { |
| uint64_t seed; |
| int r; |
| |
| assert(link); |
| |
| if (!link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) |
| return 0; |
| |
| r = ipv4ll_init(link); |
| if (r < 0) |
| return r; |
| |
| if (link->sd_device && |
| net_get_unique_predictable_data(link->sd_device, true, &seed) >= 0) { |
| r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed); |
| if (r < 0) |
| return r; |
| } |
| |
| r = sd_ipv4ll_set_mac(link->ipv4ll, &link->hw_addr.addr.ether); |
| if (r < 0) |
| return r; |
| |
| r = sd_ipv4ll_set_ifindex(link->ipv4ll, link->ifindex); |
| if (r < 0) |
| return r; |
| |
| r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int ipv4ll_update_mac(Link *link) { |
| bool restart; |
| int r; |
| |
| assert(link); |
| |
| if (!link->ipv4ll) |
| return 0; |
| |
| restart = sd_ipv4ll_is_running(link->ipv4ll) > 0; |
| |
| r = sd_ipv4ll_stop(link->ipv4ll); |
| if (r < 0) |
| return r; |
| |
| r = sd_ipv4ll_set_mac(link->ipv4ll, &link->hw_addr.addr.ether); |
| if (r < 0) |
| return r; |
| |
| if (restart) { |
| r = sd_ipv4ll_start(link->ipv4ll); |
| if (r < 0) |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| int link_serialize_ipv4ll(Link *link, FILE *f) { |
| struct in_addr address; |
| int r; |
| |
| assert(link); |
| |
| if (!link->ipv4ll) |
| return 0; |
| |
| r = sd_ipv4ll_get_address(link->ipv4ll, &address); |
| if (r == -ENOENT) |
| return 0; |
| if (r < 0) |
| return r; |
| |
| fputs("IPV4LL_ADDRESS=", f); |
| serialize_in_addrs(f, &address, 1, false, NULL); |
| fputc('\n', f); |
| |
| return 0; |
| } |
| |
| int link_deserialize_ipv4ll(Link *link, const char *ipv4ll_address) { |
| union in_addr_union address; |
| int r; |
| |
| assert(link); |
| |
| if (isempty(ipv4ll_address)) |
| return 0; |
| |
| r = in_addr_from_string(AF_INET, ipv4ll_address, &address); |
| if (r < 0) |
| return log_link_debug_errno(link, r, "Failed to parse IPv4LL address: %s", ipv4ll_address); |
| |
| r = ipv4ll_init(link); |
| if (r < 0) |
| return log_link_debug_errno(link, r, "Failed to initialize IPv4LL client: %m"); |
| |
| r = sd_ipv4ll_set_address(link->ipv4ll, &address.in); |
| if (r < 0) |
| return log_link_debug_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address); |
| |
| return 0; |
| } |
| |
| int config_parse_ipv4ll( |
| const char* unit, |
| const char *filename, |
| unsigned line, |
| const char *section, |
| unsigned section_line, |
| const char *lvalue, |
| int ltype, |
| const char *rvalue, |
| void *data, |
| void *userdata) { |
| |
| AddressFamily *link_local = data; |
| int r; |
| |
| assert(filename); |
| assert(lvalue); |
| assert(rvalue); |
| assert(data); |
| |
| /* Note that this is mostly like |
| * config_parse_address_family(), except that it |
| * applies only to IPv4 */ |
| |
| r = parse_boolean(rvalue); |
| if (r < 0) { |
| log_syntax(unit, LOG_WARNING, filename, line, r, |
| "Failed to parse %s=%s, ignoring assignment. " |
| "Note that the setting %s= is deprecated, please use LinkLocalAddressing= instead.", |
| lvalue, rvalue, lvalue); |
| return 0; |
| } |
| |
| SET_FLAG(*link_local, ADDRESS_FAMILY_IPV4, r); |
| |
| log_syntax(unit, LOG_WARNING, filename, line, 0, |
| "%s=%s is deprecated, please use LinkLocalAddressing=%s instead.", |
| lvalue, rvalue, address_family_to_string(*link_local)); |
| |
| return 0; |
| } |