![Lennart Poettering](/assets/img/avatar_default.png)
This drops a good number of type-specific _cleanup_ macros, and patches all users to just use the generic ones. In most recent code we abstained from defining type-specific macros, and this basically removes all those added already, with the exception of the really low-level ones. Having explicit macros for this is not too useful, as the expression without the extra macro is generally just 2ch wider. We should generally emphesize generic code, unless there are really good reasons for specific code, hence let's follow this in this case too. Note that _cleanup_free_ and similar really low-level, libc'ish, Linux API'ish macros continue to be defined, only the really high-level OO ones are dropped. From now on this should really be the rule: for really low-level stuff, such as memory allocation, fd handling and so one, go ahead and define explicit per-type macros, but for high-level, specific program code, just use the generic _cleanup_() macro directly, in order to keep things simple and as readable as possible for the uninitiated. Note that before this patch some of the APIs (notable libudev ones) were already used with the high-level macros at some places and with the generic _cleanup_ macro at others. With this patch we hence unify on the latter.
241 lines
6.7 KiB
C
241 lines
6.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2013-2014 Tom Gundersen <teg@jklm.no>
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***/
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#include <netinet/ether.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-manager.h"
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#include "networkd-link.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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_cleanup_(route_freep) Route *route = 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_route = false;
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link->ipv4ll_address = 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 %u.%u.%u.%u", ADDRESS_FMT_VAL(addr));
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r = address_new(&address);
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if (r < 0) {
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log_link_error_errno(link, r, "Could not allocate address: %m");
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return r;
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}
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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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address_remove(address, link, link_address_remove_handler);
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r = route_new(&route);
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if (r < 0) {
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log_link_error_errno(link, r, "Could not allocate route: %m");
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return r;
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}
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route->family = AF_INET;
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route->scope = RT_SCOPE_LINK;
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route->priority = IPV4LL_ROUTE_METRIC;
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route_remove(route, link, link_route_remove_handler);
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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_route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
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_cleanup_(link_unrefp) Link *link = userdata;
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int r;
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assert(link);
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assert(!link->ipv4ll_route);
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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_error_errno(link, r, "could not set ipv4ll route: %m");
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link_enter_failed(link);
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}
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link->ipv4ll_route = true;
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if (link->ipv4ll_address == 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_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
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_cleanup_(link_unrefp) Link *link = userdata;
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int r;
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assert(link);
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assert(!link->ipv4ll_address);
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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_error_errno(link, r, "could not set ipv4ll address: %m");
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link_enter_failed(link);
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} else if (r >= 0)
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manager_rtnl_process_address(rtnl, m, link->manager);
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link->ipv4ll_address = true;
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if (link->ipv4ll_route)
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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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_cleanup_(route_freep) Route *route = 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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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 %u.%u.%u.%u",
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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);
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if (r < 0)
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return r;
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link->ipv4ll_address = false;
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r = route_new(&route);
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if (r < 0)
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return r;
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route->family = AF_INET;
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route->scope = RT_SCOPE_LINK;
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route->protocol = RTPROT_STATIC;
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route->priority = IPV4LL_ROUTE_METRIC;
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r = route_configure(route, link, ipv4ll_route_handler);
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if (r < 0)
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return r;
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link->ipv4ll_route = false;
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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(link, "Could not acquire IPv4 link-local address");
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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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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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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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assert(link->network);
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assert(link->network->link_local & ADDRESS_FAMILY_IPV4);
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if (!link->ipv4ll) {
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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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}
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if (link->udev_device) {
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r = net_get_unique_predictable_data(link->udev_device, &seed);
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if (r >= 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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}
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r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
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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->mac);
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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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