| /* 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 "networkd-queue.h" |
| #include "parse-util.h" |
| |
| static int address_new_from_ipv4ll(Link *link, Address **ret) { |
| _cleanup_(address_freep) Address *address = NULL; |
| struct in_addr addr; |
| int r; |
| |
| assert(link); |
| assert(link->ipv4ll); |
| assert(ret); |
| |
| r = sd_ipv4ll_get_address(link->ipv4ll, &addr); |
| if (r < 0) |
| return r; |
| |
| r = address_new(&address); |
| if (r < 0) |
| return -ENOMEM; |
| |
| address->family = AF_INET; |
| address->in_addr.in = addr; |
| address->prefixlen = 16; |
| address->scope = RT_SCOPE_LINK; |
| address->route_metric = IPV4LL_ROUTE_METRIC; |
| address_set_broadcast(address); |
| |
| *ret = TAKE_PTR(address); |
| return 0; |
| } |
| |
| static int ipv4ll_address_lost(Link *link) { |
| _cleanup_(address_freep) Address *address = NULL; |
| int r; |
| |
| assert(link); |
| |
| link->ipv4ll_address_configured = false; |
| |
| r = address_new_from_ipv4ll(link, &address); |
| if (r == -ENOENT) |
| return 0; |
| if (r < 0) |
| return r; |
| |
| log_link_debug(link, "IPv4 link-local release "IPV4_ADDRESS_FMT_STR, |
| IPV4_ADDRESS_FMT_VAL(address->in_addr.in)); |
| |
| return address_remove(address, link); |
| } |
| |
| static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
| int r; |
| |
| assert(link); |
| assert(!link->ipv4ll_address_configured); |
| |
| r = address_configure_handler_internal(rtnl, m, link, "Could not set ipv4ll address"); |
| if (r <= 0) |
| return r; |
| |
| 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 *address = NULL; |
| int r; |
| |
| assert(ll); |
| assert(link); |
| |
| link->ipv4ll_address_configured = false; |
| |
| r = address_new_from_ipv4ll(link, &address); |
| if (r == -ENOENT) |
| return 0; |
| if (r < 0) |
| return r; |
| |
| log_link_debug(link, "IPv4 link-local claim "IPV4_ADDRESS_FMT_STR, |
| IPV4_ADDRESS_FMT_VAL(address->in_addr.in)); |
| |
| return link_request_address(link, TAKE_PTR(address), true, NULL, ipv4ll_address_handler, NULL); |
| } |
| |
| 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"); |
| link_enter_failed(link); |
| } |
| 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_check_mac(sd_ipv4ll *ll, const struct ether_addr *mac, void *userdata) { |
| Manager *m = userdata; |
| struct hw_addr_data hw_addr; |
| |
| assert(m); |
| assert(mac); |
| |
| hw_addr = (struct hw_addr_data) { |
| .length = ETH_ALEN, |
| .ether = *mac, |
| }; |
| |
| return link_get_by_hw_addr(m, &hw_addr, NULL) >= 0; |
| } |
| |
| int ipv4ll_configure(Link *link) { |
| uint64_t seed; |
| int r; |
| |
| assert(link); |
| |
| if (!link_ipv4ll_enabled(link)) |
| return 0; |
| |
| if (link->ipv4ll) |
| return -EBUSY; |
| |
| 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; |
| |
| 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.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 sd_ipv4ll_set_check_mac_callback(link->ipv4ll, ipv4ll_check_mac, link->manager); |
| } |
| |
| int ipv4ll_update_mac(Link *link) { |
| assert(link); |
| |
| if (link->hw_addr.length != ETH_ALEN) |
| return 0; |
| if (ether_addr_is_null(&link->hw_addr.ether)) |
| return 0; |
| if (!link->ipv4ll) |
| return 0; |
| |
| return sd_ipv4ll_set_mac(link->ipv4ll, &link->hw_addr.ether); |
| } |
| |
| 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; |
| } |
