731 lines
24 KiB
C
731 lines
24 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include "alloc-util.h"
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#include "hashmap.h"
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#include "netlink-util.h"
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#include "networkd-link.h"
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#include "networkd-manager.h"
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#include "networkd-neighbor.h"
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#include "networkd-network.h"
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#include "set.h"
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Neighbor *neighbor_free(Neighbor *neighbor) {
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if (!neighbor)
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return NULL;
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if (neighbor->network) {
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assert(neighbor->section);
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hashmap_remove(neighbor->network->neighbors_by_section, neighbor->section);
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}
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network_config_section_free(neighbor->section);
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if (neighbor->link) {
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set_remove(neighbor->link->neighbors, neighbor);
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set_remove(neighbor->link->neighbors_foreign, neighbor);
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}
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return mfree(neighbor);
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}
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DEFINE_NETWORK_SECTION_FUNCTIONS(Neighbor, neighbor_free);
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static int neighbor_new_static(Network *network, const char *filename, unsigned section_line, Neighbor **ret) {
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_cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
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_cleanup_(neighbor_freep) Neighbor *neighbor = 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);
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assert(section_line > 0);
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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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neighbor = hashmap_get(network->neighbors_by_section, n);
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if (neighbor) {
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*ret = TAKE_PTR(neighbor);
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return 0;
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}
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neighbor = new(Neighbor, 1);
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if (!neighbor)
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return -ENOMEM;
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*neighbor = (Neighbor) {
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.network = network,
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.family = AF_UNSPEC,
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.section = TAKE_PTR(n),
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};
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r = hashmap_ensure_allocated(&network->neighbors_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->neighbors_by_section, neighbor->section, neighbor);
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if (r < 0)
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return r;
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*ret = TAKE_PTR(neighbor);
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return 0;
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}
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static void neighbor_hash_func(const Neighbor *neighbor, struct siphash *state) {
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assert(neighbor);
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siphash24_compress(&neighbor->family, sizeof(neighbor->family), state);
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siphash24_compress(&neighbor->lladdr_size, sizeof(neighbor->lladdr_size), state);
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switch (neighbor->family) {
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case AF_INET:
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case AF_INET6:
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/* Equality of neighbors are given by the pair (addr,lladdr) */
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siphash24_compress(&neighbor->in_addr, FAMILY_ADDRESS_SIZE(neighbor->family), state);
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break;
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default:
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/* treat any other address family as AF_UNSPEC */
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break;
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}
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siphash24_compress(&neighbor->lladdr, neighbor->lladdr_size, state);
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}
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static int neighbor_compare_func(const Neighbor *a, const Neighbor *b) {
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int r;
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r = CMP(a->family, b->family);
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if (r != 0)
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return r;
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r = CMP(a->lladdr_size, b->lladdr_size);
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if (r != 0)
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return r;
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switch (a->family) {
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case AF_INET:
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case AF_INET6:
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r = memcmp(&a->in_addr, &b->in_addr, FAMILY_ADDRESS_SIZE(a->family));
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if (r != 0)
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return r;
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}
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return memcmp(&a->lladdr, &b->lladdr, a->lladdr_size);
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}
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DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR(neighbor_hash_ops, Neighbor, neighbor_hash_func, neighbor_compare_func, neighbor_free);
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static int neighbor_get(Link *link, const Neighbor *in, Neighbor **ret) {
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Neighbor *existing;
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assert(link);
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assert(in);
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existing = set_get(link->neighbors, in);
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if (existing) {
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if (ret)
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*ret = existing;
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return 1;
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}
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existing = set_get(link->neighbors_foreign, in);
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if (existing) {
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if (ret)
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*ret = existing;
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return 0;
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}
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return -ENOENT;
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}
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static int neighbor_add_internal(Link *link, Set **neighbors, const Neighbor *in, Neighbor **ret) {
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_cleanup_(neighbor_freep) Neighbor *neighbor = NULL;
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int r;
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assert(link);
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assert(neighbors);
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assert(in);
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neighbor = new(Neighbor, 1);
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if (!neighbor)
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return -ENOMEM;
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*neighbor = (Neighbor) {
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.family = in->family,
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.in_addr = in->in_addr,
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.lladdr = in->lladdr,
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.lladdr_size = in->lladdr_size,
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};
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r = set_ensure_put(neighbors, &neighbor_hash_ops, neighbor);
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if (r < 0)
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return r;
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if (r == 0)
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return -EEXIST;
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neighbor->link = link;
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if (ret)
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*ret = neighbor;
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TAKE_PTR(neighbor);
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return 0;
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}
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static int neighbor_add(Link *link, const Neighbor *in, Neighbor **ret) {
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Neighbor *neighbor;
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int r;
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r = neighbor_get(link, in, &neighbor);
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if (r == -ENOENT) {
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/* Neighbor doesn't exist, make a new one */
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r = neighbor_add_internal(link, &link->neighbors, in, &neighbor);
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if (r < 0)
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return r;
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} else if (r == 0) {
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/* Neighbor is foreign, claim it as recognized */
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r = set_ensure_put(&link->neighbors, &neighbor_hash_ops, neighbor);
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if (r < 0)
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return r;
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set_remove(link->neighbors_foreign, neighbor);
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} else if (r == 1) {
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/* Neighbor already exists */
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} else
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return r;
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if (ret)
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*ret = neighbor;
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return 0;
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}
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static int neighbor_add_foreign(Link *link, const Neighbor *in, Neighbor **ret) {
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return neighbor_add_internal(link, &link->neighbors_foreign, in, ret);
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}
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static bool neighbor_equal(const Neighbor *n1, const Neighbor *n2) {
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if (n1 == n2)
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return true;
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if (!n1 || !n2)
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return false;
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return neighbor_compare_func(n1, n2) == 0;
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}
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static int neighbor_configure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
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int r;
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assert(m);
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assert(link);
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assert(link->neighbor_messages > 0);
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link->neighbor_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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/* Neighbor may not exist yet. So, do not enter failed state here. */
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log_link_message_warning_errno(link, m, r, "Could not set neighbor, ignoring");
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if (link->neighbor_messages == 0) {
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log_link_debug(link, "Neighbors set");
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link->neighbors_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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static int neighbor_configure(Neighbor *neighbor, Link *link) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
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int r;
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assert(neighbor);
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assert(link);
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assert(link->ifindex > 0);
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assert(link->manager);
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assert(link->manager->rtnl);
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r = sd_rtnl_message_new_neigh(link->manager->rtnl, &req, RTM_NEWNEIGH,
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link->ifindex, neighbor->family);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not allocate RTM_NEWNEIGH message: %m");
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r = sd_rtnl_message_neigh_set_state(req, NUD_PERMANENT);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not set state: %m");
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r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK | NLM_F_CREATE | NLM_F_REPLACE);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not set flags: %m");
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r = sd_netlink_message_append_data(req, NDA_LLADDR, &neighbor->lladdr, neighbor->lladdr_size);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not append NDA_LLADDR attribute: %m");
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r = netlink_message_append_in_addr_union(req, NDA_DST, neighbor->family, &neighbor->in_addr);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not append NDA_DST attribute: %m");
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r = netlink_call_async(link->manager->rtnl, NULL, req, neighbor_configure_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->neighbor_messages++;
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link_ref(link);
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r = neighbor_add(link, neighbor, NULL);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not add neighbor: %m");
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return 0;
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}
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int link_set_neighbors(Link *link) {
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Neighbor *neighbor;
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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->state != _LINK_STATE_INVALID);
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if (link->neighbor_messages != 0) {
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log_link_debug(link, "Neighbors are configuring.");
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return 0;
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}
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link->neighbors_configured = false;
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HASHMAP_FOREACH(neighbor, link->network->neighbors_by_section) {
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r = neighbor_configure(neighbor, link);
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if (r < 0)
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return log_link_warning_errno(link, r, "Could not set neighbor: %m");
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}
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if (link->neighbor_messages == 0) {
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link->neighbors_configured = true;
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link_check_ready(link);
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} else {
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log_link_debug(link, "Setting neighbors");
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link_set_state(link, LINK_STATE_CONFIGURING);
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}
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return 0;
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}
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static int neighbor_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
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int r;
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assert(m);
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assert(link);
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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 != -ESRCH)
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/* Neighbor may not exist because it already got deleted, ignore that. */
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log_link_message_warning_errno(link, m, r, "Could not remove neighbor");
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return 1;
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}
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static int neighbor_remove(Neighbor *neighbor, Link *link) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
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int r;
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assert(neighbor);
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assert(link);
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assert(link->ifindex > 0);
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assert(link->manager);
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assert(link->manager->rtnl);
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r = sd_rtnl_message_new_neigh(link->manager->rtnl, &req, RTM_DELNEIGH,
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link->ifindex, neighbor->family);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not allocate RTM_DELNEIGH message: %m");
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r = netlink_message_append_in_addr_union(req, NDA_DST, neighbor->family, &neighbor->in_addr);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not append NDA_DST attribute: %m");
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r = netlink_call_async(link->manager->rtnl, NULL, req, neighbor_remove_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 0;
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}
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static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
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Neighbor *net_neighbor;
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assert(link);
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assert(neighbor);
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if (!link->network)
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return false;
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HASHMAP_FOREACH(net_neighbor, link->network->neighbors_by_section)
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if (neighbor_equal(net_neighbor, neighbor))
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return true;
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return false;
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}
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int link_drop_foreign_neighbors(Link *link) {
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Neighbor *neighbor;
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int r;
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assert(link);
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SET_FOREACH(neighbor, link->neighbors_foreign)
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if (link_is_neighbor_configured(link, neighbor)) {
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r = neighbor_add(link, neighbor, NULL);
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if (r < 0)
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return r;
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} else {
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r = neighbor_remove(neighbor, link);
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if (r < 0)
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return r;
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}
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return 0;
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}
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int link_drop_neighbors(Link *link) {
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Neighbor *neighbor;
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int k, r = 0;
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assert(link);
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SET_FOREACH(neighbor, link->neighbors) {
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k = neighbor_remove(neighbor, link);
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if (k < 0 && r >= 0)
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r = k;
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}
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return r;
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}
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static int manager_rtnl_process_neighbor_lladdr(sd_netlink_message *message, union lladdr_union *lladdr, size_t *size, char **str) {
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int r;
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assert(message);
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assert(lladdr);
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assert(size);
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assert(str);
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*str = NULL;
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r = sd_netlink_message_read(message, NDA_LLADDR, sizeof(lladdr->ip.in6), &lladdr->ip.in6);
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if (r >= 0) {
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*size = sizeof(lladdr->ip.in6);
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if (in_addr_to_string(AF_INET6, &lladdr->ip, str) < 0)
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log_warning_errno(r, "Could not print lower address: %m");
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return r;
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}
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r = sd_netlink_message_read(message, NDA_LLADDR, sizeof(lladdr->mac), &lladdr->mac);
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if (r >= 0) {
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*size = sizeof(lladdr->mac);
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*str = new(char, ETHER_ADDR_TO_STRING_MAX);
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if (!*str) {
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log_oom();
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return r;
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}
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ether_addr_to_string(&lladdr->mac, *str);
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return r;
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}
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r = sd_netlink_message_read(message, NDA_LLADDR, sizeof(lladdr->ip.in), &lladdr->ip.in);
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if (r >= 0) {
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*size = sizeof(lladdr->ip.in);
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if (in_addr_to_string(AF_INET, &lladdr->ip, str) < 0)
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log_warning_errno(r, "Could not print lower address: %m");
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return r;
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}
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return r;
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}
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int manager_rtnl_process_neighbor(sd_netlink *rtnl, sd_netlink_message *message, Manager *m) {
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_cleanup_(neighbor_freep) Neighbor *tmp = NULL;
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_cleanup_free_ char *addr_str = NULL, *lladdr_str = NULL;
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Neighbor *neighbor = NULL;
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uint16_t type, state;
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int ifindex, r;
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Link *link;
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assert(rtnl);
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assert(message);
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assert(m);
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if (sd_netlink_message_is_error(message)) {
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r = sd_netlink_message_get_errno(message);
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if (r < 0)
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log_message_warning_errno(message, r, "rtnl: failed to receive neighbor message, ignoring");
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return 0;
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}
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r = sd_netlink_message_get_type(message, &type);
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if (r < 0) {
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log_warning_errno(r, "rtnl: could not get message type, ignoring: %m");
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return 0;
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} else if (!IN_SET(type, RTM_NEWNEIGH, RTM_DELNEIGH)) {
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log_warning("rtnl: received unexpected message type %u when processing neighbor, ignoring.", type);
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return 0;
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}
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r = sd_rtnl_message_neigh_get_state(message, &state);
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if (r < 0) {
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log_warning_errno(r, "rtnl: received neighbor message with invalid state, ignoring: %m");
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return 0;
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} else if (!FLAGS_SET(state, NUD_PERMANENT)) {
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log_debug("rtnl: received non-static neighbor, ignoring.");
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return 0;
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}
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r = sd_rtnl_message_neigh_get_ifindex(message, &ifindex);
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if (r < 0) {
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log_warning_errno(r, "rtnl: could not get ifindex from message, ignoring: %m");
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return 0;
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} else if (ifindex <= 0) {
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log_warning("rtnl: received neighbor message with invalid ifindex %d, ignoring.", ifindex);
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return 0;
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}
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r = link_get(m, ifindex, &link);
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if (r < 0 || !link) {
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/* when enumerating we might be out of sync, but we will get the neighbor again, so just
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* ignore it */
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if (!m->enumerating)
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log_warning("rtnl: received neighbor for link '%d' we don't know about, ignoring.", ifindex);
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return 0;
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}
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tmp = new0(Neighbor, 1);
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r = sd_rtnl_message_neigh_get_family(message, &tmp->family);
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if (r < 0) {
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log_link_warning(link, "rtnl: received neighbor message without family, ignoring.");
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return 0;
|
|
} else if (!IN_SET(tmp->family, AF_INET, AF_INET6)) {
|
|
log_link_debug(link, "rtnl: received neighbor message with invalid family '%i', ignoring.", tmp->family);
|
|
return 0;
|
|
}
|
|
|
|
r = netlink_message_read_in_addr_union(message, NDA_DST, tmp->family, &tmp->in_addr);
|
|
if (r < 0) {
|
|
log_link_warning_errno(link, r, "rtnl: received neighbor message without valid address, ignoring: %m");
|
|
return 0;
|
|
}
|
|
|
|
if (in_addr_to_string(tmp->family, &tmp->in_addr, &addr_str) < 0)
|
|
log_link_warning_errno(link, r, "Could not print address: %m");
|
|
|
|
r = manager_rtnl_process_neighbor_lladdr(message, &tmp->lladdr, &tmp->lladdr_size, &lladdr_str);
|
|
if (r < 0) {
|
|
log_link_warning_errno(link, r, "rtnl: received neighbor message with invalid lladdr, ignoring: %m");
|
|
return 0;
|
|
}
|
|
|
|
(void) neighbor_get(link, tmp, &neighbor);
|
|
|
|
switch (type) {
|
|
case RTM_NEWNEIGH:
|
|
if (neighbor)
|
|
log_link_debug(link, "Received remembered neighbor: %s->%s",
|
|
strnull(addr_str), strnull(lladdr_str));
|
|
else {
|
|
/* A neighbor appeared that we did not request */
|
|
r = neighbor_add_foreign(link, tmp, NULL);
|
|
if (r < 0) {
|
|
log_link_warning_errno(link, r, "Failed to remember foreign neighbor %s->%s, ignoring: %m",
|
|
strnull(addr_str), strnull(lladdr_str));
|
|
return 0;
|
|
} else
|
|
log_link_debug(link, "Remembering foreign neighbor: %s->%s",
|
|
strnull(addr_str), strnull(lladdr_str));
|
|
}
|
|
|
|
break;
|
|
|
|
case RTM_DELNEIGH:
|
|
if (neighbor) {
|
|
log_link_debug(link, "Forgetting neighbor: %s->%s",
|
|
strnull(addr_str), strnull(lladdr_str));
|
|
(void) neighbor_free(neighbor);
|
|
} else
|
|
log_link_debug(link, "Kernel removed a neighbor we don't remember: %s->%s, ignoring.",
|
|
strnull(addr_str), strnull(lladdr_str));
|
|
|
|
break;
|
|
|
|
default:
|
|
assert_not_reached("Received invalid RTNL message type");
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int neighbor_section_verify(Neighbor *neighbor) {
|
|
if (section_is_invalid(neighbor->section))
|
|
return -EINVAL;
|
|
|
|
if (neighbor->family == AF_UNSPEC)
|
|
return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"%s: Neighbor section without Address= configured. "
|
|
"Ignoring [Neighbor] section from line %u.",
|
|
neighbor->section->filename, neighbor->section->line);
|
|
|
|
if (neighbor->lladdr_size == 0)
|
|
return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"%s: Neighbor section without LinkLayerAddress= configured. "
|
|
"Ignoring [Neighbor] section from line %u.",
|
|
neighbor->section->filename, neighbor->section->line);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void network_drop_invalid_neighbors(Network *network) {
|
|
Neighbor *neighbor;
|
|
|
|
assert(network);
|
|
|
|
HASHMAP_FOREACH(neighbor, network->neighbors_by_section)
|
|
if (neighbor_section_verify(neighbor) < 0)
|
|
neighbor_free(neighbor);
|
|
}
|
|
|
|
|
|
int config_parse_neighbor_address(
|
|
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) {
|
|
|
|
Network *network = userdata;
|
|
_cleanup_(neighbor_free_or_set_invalidp) Neighbor *n = NULL;
|
|
int r;
|
|
|
|
assert(filename);
|
|
assert(section);
|
|
assert(lvalue);
|
|
assert(rvalue);
|
|
assert(data);
|
|
|
|
r = neighbor_new_static(network, filename, section_line, &n);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
r = in_addr_from_string_auto(rvalue, &n->family, &n->in_addr);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_WARNING, filename, line, r,
|
|
"Neighbor Address is invalid, ignoring assignment: %s", rvalue);
|
|
return 0;
|
|
}
|
|
|
|
TAKE_PTR(n);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int config_parse_neighbor_lladdr(
|
|
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) {
|
|
|
|
Network *network = userdata;
|
|
_cleanup_(neighbor_free_or_set_invalidp) Neighbor *n = NULL;
|
|
int family, r;
|
|
|
|
assert(filename);
|
|
assert(section);
|
|
assert(lvalue);
|
|
assert(rvalue);
|
|
assert(data);
|
|
|
|
r = neighbor_new_static(network, filename, section_line, &n);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
r = ether_addr_from_string(rvalue, &n->lladdr.mac);
|
|
if (r >= 0)
|
|
n->lladdr_size = sizeof(n->lladdr.mac);
|
|
else {
|
|
r = in_addr_from_string_auto(rvalue, &family, &n->lladdr.ip);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_WARNING, filename, line, r,
|
|
"Neighbor LinkLayerAddress= is invalid, ignoring assignment: %s",
|
|
rvalue);
|
|
return 0;
|
|
}
|
|
n->lladdr_size = family == AF_INET ? sizeof(n->lladdr.ip.in) : sizeof(n->lladdr.ip.in6);
|
|
}
|
|
|
|
TAKE_PTR(n);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int config_parse_neighbor_hwaddr(
|
|
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) {
|
|
|
|
Network *network = userdata;
|
|
_cleanup_(neighbor_free_or_set_invalidp) Neighbor *n = NULL;
|
|
int r;
|
|
|
|
assert(filename);
|
|
assert(section);
|
|
assert(lvalue);
|
|
assert(rvalue);
|
|
assert(data);
|
|
|
|
r = neighbor_new_static(network, filename, section_line, &n);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
r = ether_addr_from_string(rvalue, &n->lladdr.mac);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_WARNING, filename, line, r,
|
|
"Neighbor MACAddress= is invalid, ignoring assignment: %s", rvalue);
|
|
return 0;
|
|
}
|
|
|
|
n->lladdr_size = sizeof(n->lladdr.mac);
|
|
TAKE_PTR(n);
|
|
|
|
return 0;
|
|
}
|