static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) { _cleanup_address_free_ Address *ll_addr = NULL; _cleanup_route_free_ Route *route = NULL; struct in_addr address; int r; assert(ll); assert(link); 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 %u.%u.%u.%u", 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 | htonl(0xfffffffflu >> ll_addr->prefixlen); ll_addr->scope = RT_SCOPE_LINK; r = address_configure(ll_addr, link, ipv4ll_address_handler, false); if (r < 0) return r; link->ipv4ll_address = false; r = route_new(&route); if (r < 0) return r; route->family = AF_INET; route->scope = RT_SCOPE_LINK; route->protocol = RTPROT_STATIC; route->priority = IPV4LL_ROUTE_METRIC; r = route_configure(route, link, ipv4ll_route_handler); if (r < 0) return r; link->ipv4ll_route = false; return 0; }
static int ipv4ll_address_lost(Link *link) { _cleanup_address_free_ Address *address = NULL; _cleanup_route_free_ Route *route = NULL; struct in_addr addr; int r; assert(link); link->ipv4ll_route = false; link->ipv4ll_address = false; r = sd_ipv4ll_get_address(link->ipv4ll, &addr); if (r < 0) return 0; log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr)); r = address_new_dynamic(&address); if (r < 0) { log_link_error(link, "Could not allocate address: %s", strerror(-r)); return r; } address->family = AF_INET; address->in_addr.in = addr; address->prefixlen = 16; address->scope = RT_SCOPE_LINK; address_drop(address, link, &link_address_drop_handler); r = route_new_dynamic(&route, RTPROT_UNSPEC); if (r < 0) { log_link_error(link, "Could not allocate route: %s", strerror(-r)); return r; } route->family = AF_INET; route->scope = RT_SCOPE_LINK; route->metrics = IPV4LL_ROUTE_METRIC; route_drop(route, link, &link_route_drop_handler); link_client_handler(link); return 0; }
static int ipv4ll_address_lost(Link *link) { _cleanup_address_free_ Address *address = NULL; _cleanup_route_free_ Route *route = NULL; struct in_addr addr; int r; assert(link); link->ipv4ll_route = false; link->ipv4ll_address = false; r = sd_ipv4ll_get_address(link->ipv4ll, &addr); if (r < 0) return 0; log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr)); r = address_new(&address); if (r < 0) { log_link_error_errno(link, r, "Could not allocate address: %m"); return r; } address->family = AF_INET; address->in_addr.in = addr; address->prefixlen = 16; address->scope = RT_SCOPE_LINK; address_remove(address, link, &link_address_remove_handler); r = route_new(&route); if (r < 0) { log_link_error_errno(link, r, "Could not allocate route: %m"); return r; } route->family = AF_INET; route->scope = RT_SCOPE_LINK; route->priority = IPV4LL_ROUTE_METRIC; route_remove(route, link, &link_route_remove_handler); link_check_ready(link); return 0; }
static void ll_handler(sd_ipv4ll *ll, int event, void *userdata) { _cleanup_free_ char *address = NULL; struct in_addr addr = {}; assert_se(ll); if (sd_ipv4ll_get_address(ll, &addr) >= 0) assert_se(in_addr_to_string(AF_INET, (const union in_addr_union*) &addr, &address) >= 0); switch (event) { case SD_IPV4LL_EVENT_BIND: log_info("bound %s", strna(address)); break; case SD_IPV4LL_EVENT_CONFLICT: log_info("conflict on %s", strna(address)); break; case SD_IPV4LL_EVENT_STOP: log_error("the client was stopped with address %s", strna(address)); break; default: assert_not_reached("invalid LL event"); } }