diff options
Diffstat (limited to 'src/network/networkd-ipv4ll.c')
| -rw-r--r-- | src/network/networkd-ipv4ll.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/src/network/networkd-ipv4ll.c b/src/network/networkd-ipv4ll.c new file mode 100644 index 0000000..3562e90 --- /dev/null +++ b/src/network/networkd-ipv4ll.c @@ -0,0 +1,227 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include <netinet/ether.h> +#include <linux/if.h> + +#include "network-internal.h" +#include "networkd-address.h" +#include "networkd-manager.h" +#include "networkd-link.h" + +static int ipv4ll_address_lost(Link *link) { + _cleanup_(address_freep) Address *address = NULL; + _cleanup_(route_freep) 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) + 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; + + address_remove(address, link, NULL); + + r = route_new(&route); + if (r < 0) + return log_link_error_errno(link, r, "Could not allocate route: %m"); + + route->family = AF_INET; + route->scope = RT_SCOPE_LINK; + route->priority = IPV4LL_ROUTE_METRIC; + + route_remove(route, link, NULL); + + link_check_ready(link); + + return 0; +} + +static int ipv4ll_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + assert(link); + assert(!link->ipv4ll_route); + + r = sd_netlink_message_get_errno(m); + if (r < 0 && r != -EEXIST) { + log_link_error_errno(link, r, "could not set ipv4ll route: %m"); + link_enter_failed(link); + } + + link->ipv4ll_route = true; + + if (link->ipv4ll_address == true) + link_check_ready(link); + + return 1; +} + +static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + assert(link); + assert(!link->ipv4ll_address); + + r = sd_netlink_message_get_errno(m); + if (r < 0 && r != -EEXIST) { + log_link_error_errno(link, r, "could not set ipv4ll address: %m"); + link_enter_failed(link); + } else if (r >= 0) + manager_rtnl_process_address(rtnl, m, link->manager); + + link->ipv4ll_address = true; + + if (link->ipv4ll_route) + link_check_ready(link); + + return 1; +} + +static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) { + _cleanup_(address_freep) Address *ll_addr = NULL; + _cleanup_(route_freep) 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 | htobe32(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 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(link, "Could not acquire IPv4 link-local address"); + break; + case SD_IPV4LL_EVENT_BIND: + r = ipv4ll_address_claimed(ll, link); + if (r < 0) { + link_enter_failed(link); + return; + } + break; + default: + log_link_warning(link, "IPv4 link-local unknown event: %d", event); + break; + } +} + +int ipv4ll_configure(Link *link) { + uint64_t seed; + int r; + + assert(link); + assert(link->network); + assert(link->network->link_local & ADDRESS_FAMILY_IPV4); + + if (!link->ipv4ll) { + r = sd_ipv4ll_new(&link->ipv4ll); + if (r < 0) + return r; + } + + if (link->sd_device && + net_get_unique_predictable_data(link->sd_device, &seed) >= 0) { + r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed); + if (r < 0) + return r; + } + + r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0); + if (r < 0) + return r; + + r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac); + 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; +} |