330 lines
11 KiB
C
330 lines
11 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <net/if.h>
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#include "netlink-util.h"
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#include "networkd-manager.h"
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#include "networkd-mdb.h"
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#include "string-util.h"
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#include "vlan-util.h"
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#define STATIC_MDB_ENTRIES_PER_NETWORK_MAX 1024U
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/* create a new MDB entry or get an existing one. */
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static int mdb_entry_new_static(
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Network *network,
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const char *filename,
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unsigned section_line,
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MdbEntry **ret) {
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_cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
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_cleanup_(mdb_entry_freep) MdbEntry *mdb_entry = NULL;
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int r;
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assert(network);
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assert(ret);
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assert(!!filename == (section_line > 0));
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/* search entry in hashmap first. */
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if (filename) {
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r = network_config_section_new(filename, section_line, &n);
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if (r < 0)
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return r;
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mdb_entry = hashmap_get(network->mdb_entries_by_section, n);
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if (mdb_entry) {
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*ret = TAKE_PTR(mdb_entry);
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return 0;
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}
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}
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if (network->n_static_mdb_entries >= STATIC_MDB_ENTRIES_PER_NETWORK_MAX)
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return -E2BIG;
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/* allocate space for an MDB entry. */
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mdb_entry = new(MdbEntry, 1);
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if (!mdb_entry)
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return -ENOMEM;
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/* init MDB structure. */
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*mdb_entry = (MdbEntry) {
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.network = network,
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};
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LIST_PREPEND(static_mdb_entries, network->static_mdb_entries, mdb_entry);
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network->n_static_mdb_entries++;
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if (filename) {
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mdb_entry->section = TAKE_PTR(n);
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r = hashmap_ensure_allocated(&network->mdb_entries_by_section, &network_config_hash_ops);
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if (r < 0)
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return r;
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r = hashmap_put(network->mdb_entries_by_section, mdb_entry->section, mdb_entry);
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if (r < 0)
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return r;
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}
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/* return allocated MDB structure. */
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*ret = TAKE_PTR(mdb_entry);
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return 0;
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}
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/* remove and MDB entry. */
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MdbEntry *mdb_entry_free(MdbEntry *mdb_entry) {
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if (!mdb_entry)
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return NULL;
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if (mdb_entry->network) {
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LIST_REMOVE(static_mdb_entries, mdb_entry->network->static_mdb_entries, mdb_entry);
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assert(mdb_entry->network->n_static_mdb_entries > 0);
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mdb_entry->network->n_static_mdb_entries--;
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if (mdb_entry->section)
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hashmap_remove(mdb_entry->network->mdb_entries_by_section, mdb_entry->section);
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}
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network_config_section_free(mdb_entry->section);
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return mfree(mdb_entry);
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}
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static int set_mdb_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
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int r;
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assert(link);
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assert(link->bridge_mdb_messages > 0);
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link->bridge_mdb_messages--;
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if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
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return 1;
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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_message_warning_errno(link, m, r, "Could not add MDB entry");
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link_enter_failed(link);
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return 1;
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}
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if (link->bridge_mdb_messages == 0) {
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link->bridge_mdb_configured = true;
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link_check_ready(link);
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}
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return 1;
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}
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/* send a request to the kernel to add an MDB entry */
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static int mdb_entry_configure(Link *link, MdbEntry *mdb_entry) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
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struct br_mdb_entry entry;
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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->manager);
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assert(mdb_entry);
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if (DEBUG_LOGGING) {
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_cleanup_free_ char *a = NULL;
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(void) in_addr_to_string(mdb_entry->family, &mdb_entry->group_addr, &a);
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log_link_debug(link, "Configuring bridge MDB entry: MulticastGroupAddress=%s, VLANId=%u",
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strna(a), mdb_entry->vlan_id);
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}
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entry = (struct br_mdb_entry) {
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.state = MDB_PERMANENT,
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.ifindex = link->ifindex,
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.vid = mdb_entry->vlan_id,
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};
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/* create new RTM message */
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r = sd_rtnl_message_new_mdb(link->manager->rtnl, &req, RTM_NEWMDB, link->network->bridge->ifindex);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not create RTM_NEWMDB message: %m");
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switch (mdb_entry->family) {
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case AF_INET:
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entry.addr.u.ip4 = mdb_entry->group_addr.in.s_addr;
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entry.addr.proto = htobe16(ETH_P_IP);
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break;
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case AF_INET6:
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entry.addr.u.ip6 = mdb_entry->group_addr.in6;
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entry.addr.proto = htobe16(ETH_P_IPV6);
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break;
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default:
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assert_not_reached("Invalid address family");
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}
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r = sd_netlink_message_append_data(req, MDBA_SET_ENTRY, &entry, sizeof(entry));
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if (r < 0)
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return log_link_error_errno(link, r, "Could not append MDBA_SET_ENTRY attribute: %m");
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r = netlink_call_async(link->manager->rtnl, NULL, req, set_mdb_handler,
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link_netlink_destroy_callback, link);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
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link_ref(link);
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return 1;
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}
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int link_set_bridge_mdb(Link *link) {
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MdbEntry *mdb_entry;
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Link *master;
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int r;
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assert(link);
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link->bridge_mdb_configured = false;
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if (!link->network)
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return 0;
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if (!link->network->bridge) {
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link->bridge_mdb_configured = true;
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return 0;
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}
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if (!link_has_carrier(link))
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return log_link_debug(link, "Link does not have carrier yet, setting MDB entries later.");
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r = link_get(link->manager, link->network->bridge->ifindex, &master);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to get Link object for Bridge=%s", link->network->bridge->ifname);
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if (!link_has_carrier(master))
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return log_link_debug(link, "Bridge interface %s does not have carrier yet, setting MDB entries later.", link->network->bridge->ifname);
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LIST_FOREACH(static_mdb_entries, mdb_entry, link->network->static_mdb_entries) {
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r = mdb_entry_configure(link, mdb_entry);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to add MDB entry to multicast group database: %m");
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link->bridge_mdb_messages++;
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}
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if (link->bridge_mdb_messages == 0) {
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link->bridge_mdb_configured = true;
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link_check_ready(link);
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}
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return 0;
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}
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/* parse the VLAN Id from config files. */
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int config_parse_mdb_vlan_id(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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_cleanup_(mdb_entry_free_or_set_invalidp) MdbEntry *mdb_entry = NULL;
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Network *network = userdata;
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int r;
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assert(filename);
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assert(section);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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r = mdb_entry_new_static(network, filename, section_line, &mdb_entry);
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if (r < 0)
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return log_oom();
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r = config_parse_vlanid(unit, filename, line, section,
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section_line, lvalue, ltype,
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rvalue, &mdb_entry->vlan_id, userdata);
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if (r < 0)
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return r;
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mdb_entry = NULL;
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return 0;
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}
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/* parse the multicast group from config files. */
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int config_parse_mdb_group_address(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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_cleanup_(mdb_entry_free_or_set_invalidp) MdbEntry *mdb_entry = NULL;
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Network *network = userdata;
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int r;
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assert(filename);
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assert(section);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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r = mdb_entry_new_static(network, filename, section_line, &mdb_entry);
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if (r < 0)
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return log_oom();
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r = in_addr_from_string_auto(rvalue, &mdb_entry->family, &mdb_entry->group_addr);
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if (r < 0) {
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log_syntax(unit, LOG_WARNING, filename, line, r, "Cannot parse multicast group address: %m");
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return 0;
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}
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mdb_entry = NULL;
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return 0;
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}
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int mdb_entry_verify(MdbEntry *mdb_entry) {
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if (section_is_invalid(mdb_entry->section))
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return -EINVAL;
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if (mdb_entry->family == AF_UNSPEC)
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return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
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"%s: [BridgeMDB] section without MulticastGroupAddress= field configured. "
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"Ignoring [BridgeMDB] section from line %u.",
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mdb_entry->section->filename, mdb_entry->section->line);
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if (!in_addr_is_multicast(mdb_entry->family, &mdb_entry->group_addr))
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return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
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"%s: MulticastGroupAddress= is not a multicast address. "
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"Ignoring [BridgeMDB] section from line %u.",
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mdb_entry->section->filename, mdb_entry->section->line);
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if (mdb_entry->family == AF_INET) {
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if (in4_addr_is_local_multicast(&mdb_entry->group_addr.in))
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return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
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"%s: MulticastGroupAddress= is a local multicast address. "
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"Ignoring [BridgeMDB] section from line %u.",
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mdb_entry->section->filename, mdb_entry->section->line);
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} else {
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if (in6_addr_is_link_local_all_nodes(&mdb_entry->group_addr.in6))
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return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
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"%s: MulticastGroupAddress= is the multicast all nodes address. "
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"Ignoring [BridgeMDB] section from line %u.",
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mdb_entry->section->filename, mdb_entry->section->line);
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}
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return 0;
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}
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