466 lines
14 KiB
C
466 lines
14 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+
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* Copyright © 2019 VMware, Inc.
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*/
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#include <linux/nexthop.h>
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#include "alloc-util.h"
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#include "conf-parser.h"
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#include "in-addr-util.h"
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#include "netlink-util.h"
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#include "networkd-manager.h"
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#include "networkd-nexthop.h"
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#include "parse-util.h"
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#include "set.h"
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#include "string-util.h"
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#include "util.h"
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int nexthop_new(NextHop **ret) {
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_cleanup_(nexthop_freep) NextHop *nexthop = NULL;
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nexthop = new(NextHop, 1);
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if (!nexthop)
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return -ENOMEM;
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*nexthop = (NextHop) {
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.family = AF_UNSPEC,
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};
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*ret = TAKE_PTR(nexthop);
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return 0;
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}
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static int nexthop_new_static(Network *network, const char *filename, unsigned section_line, NextHop **ret) {
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_cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
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_cleanup_(nexthop_freep) NextHop *nexthop = 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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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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nexthop = hashmap_get(network->nexthops_by_section, n);
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if (nexthop) {
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*ret = TAKE_PTR(nexthop);
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return 0;
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}
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}
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r = nexthop_new(&nexthop);
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if (r < 0)
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return r;
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nexthop->protocol = RTPROT_STATIC;
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nexthop->network = network;
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LIST_PREPEND(nexthops, network->static_nexthops, nexthop);
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network->n_static_nexthops++;
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if (filename) {
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nexthop->section = TAKE_PTR(n);
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r = hashmap_ensure_allocated(&network->nexthops_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->nexthops_by_section, nexthop->section, nexthop);
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if (r < 0)
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return r;
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}
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*ret = TAKE_PTR(nexthop);
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return 0;
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}
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void nexthop_free(NextHop *nexthop) {
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if (!nexthop)
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return;
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if (nexthop->network) {
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LIST_REMOVE(nexthops, nexthop->network->static_nexthops, nexthop);
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assert(nexthop->network->n_static_nexthops > 0);
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nexthop->network->n_static_nexthops--;
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if (nexthop->section)
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hashmap_remove(nexthop->network->nexthops_by_section, nexthop->section);
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}
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network_config_section_free(nexthop->section);
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if (nexthop->link) {
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set_remove(nexthop->link->nexthops, nexthop);
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set_remove(nexthop->link->nexthops_foreign, nexthop);
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}
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free(nexthop);
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}
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static void nexthop_hash_func(const NextHop *nexthop, struct siphash *state) {
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assert(nexthop);
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siphash24_compress(&nexthop->id, sizeof(nexthop->id), state);
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siphash24_compress(&nexthop->oif, sizeof(nexthop->oif), state);
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siphash24_compress(&nexthop->family, sizeof(nexthop->family), state);
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switch (nexthop->family) {
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case AF_INET:
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case AF_INET6:
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siphash24_compress(&nexthop->gw, FAMILY_ADDRESS_SIZE(nexthop->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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}
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static int nexthop_compare_func(const NextHop *a, const NextHop *b) {
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int r;
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r = CMP(a->id, b->id);
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if (r != 0)
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return r;
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r = CMP(a->oif, b->oif);
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if (r != 0)
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return 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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switch (a->family) {
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case AF_INET:
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case AF_INET6:
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r = memcmp(&a->gw, &b->gw, FAMILY_ADDRESS_SIZE(a->family));
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if (r != 0)
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return r;
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return 0;
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default:
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/* treat any other address family as AF_UNSPEC */
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return 0;
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}
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}
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DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(
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nexthop_hash_ops,
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NextHop,
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nexthop_hash_func,
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nexthop_compare_func,
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nexthop_free);
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bool nexthop_equal(NextHop *r1, NextHop *r2) {
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if (r1 == r2)
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return true;
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if (!r1 || !r2)
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return false;
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return nexthop_compare_func(r1, r2) == 0;
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}
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int nexthop_get(Link *link, NextHop *in, NextHop **ret) {
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NextHop *existing;
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assert(link);
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assert(in);
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existing = set_get(link->nexthops, 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->nexthops_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 nexthop_add_internal(Link *link, Set **nexthops, NextHop *in, NextHop **ret) {
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_cleanup_(nexthop_freep) NextHop *nexthop = NULL;
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int r;
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assert(link);
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assert(nexthops);
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assert(in);
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r = nexthop_new(&nexthop);
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if (r < 0)
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return r;
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nexthop->id = in->id;
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nexthop->oif = in->oif;
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nexthop->family = in->family;
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nexthop->gw = in->gw;
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r = set_ensure_put(nexthops, &nexthop_hash_ops, nexthop);
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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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nexthop->link = link;
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if (ret)
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*ret = nexthop;
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nexthop = NULL;
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return 0;
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}
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int nexthop_add_foreign(Link *link, NextHop *in, NextHop **ret) {
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return nexthop_add_internal(link, &link->nexthops_foreign, in, ret);
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}
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int nexthop_add(Link *link, NextHop *in, NextHop **ret) {
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NextHop *nexthop;
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int r;
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r = nexthop_get(link, in, &nexthop);
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if (r == -ENOENT) {
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/* NextHop does not exist, create a new one */
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r = nexthop_add_internal(link, &link->nexthops, in, &nexthop);
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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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/* Take over a foreign nexthop */
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r = set_ensure_put(&link->nexthops, &nexthop_hash_ops, nexthop);
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if (r < 0)
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return r;
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set_remove(link->nexthops_foreign, nexthop);
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} else if (r == 1) {
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/* NextHop exists, do nothing */
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;
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} else
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return r;
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if (ret)
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*ret = nexthop;
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return 0;
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}
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static int nexthop_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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assert(link->ifname);
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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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log_link_message_warning_errno(link, m, r, "Could not drop nexthop, ignoring");
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return 1;
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}
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int nexthop_remove(NextHop *nexthop, Link *link,
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link_netlink_message_handler_t callback) {
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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(link);
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assert(link->manager);
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assert(link->manager->rtnl);
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assert(link->ifindex > 0);
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assert(IN_SET(nexthop->family, AF_INET, AF_INET6));
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r = sd_rtnl_message_new_nexthop(link->manager->rtnl, &req,
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RTM_DELNEXTHOP, nexthop->family,
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nexthop->protocol);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not create RTM_DELNEXTHOP message: %m");
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if (DEBUG_LOGGING) {
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_cleanup_free_ char *gw = NULL;
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if (!in_addr_is_null(nexthop->family, &nexthop->gw))
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(void) in_addr_to_string(nexthop->family, &nexthop->gw, &gw);
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log_link_debug(link, "Removing nexthop: gw: %s", strna(gw));
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}
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if (in_addr_is_null(nexthop->family, &nexthop->gw) == 0) {
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r = netlink_message_append_in_addr_union(req, RTA_GATEWAY, nexthop->family, &nexthop->gw);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not append RTA_GATEWAY attribute: %m");
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}
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r = netlink_call_async(link->manager->rtnl, NULL, req,
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callback ?: nexthop_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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int nexthop_configure(
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NextHop *nexthop,
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Link *link,
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link_netlink_message_handler_t callback) {
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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(link);
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assert(link->manager);
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assert(link->manager->rtnl);
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assert(link->ifindex > 0);
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assert(IN_SET(nexthop->family, AF_INET, AF_INET6));
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assert(callback);
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if (DEBUG_LOGGING) {
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_cleanup_free_ char *gw = NULL;
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if (!in_addr_is_null(nexthop->family, &nexthop->gw))
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(void) in_addr_to_string(nexthop->family, &nexthop->gw, &gw);
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log_link_debug(link, "Configuring nexthop: gw: %s", strna(gw));
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}
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r = sd_rtnl_message_new_nexthop(link->manager->rtnl, &req,
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RTM_NEWNEXTHOP, nexthop->family,
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nexthop->protocol);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not create RTM_NEWNEXTHOP message: %m");
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r = sd_netlink_message_append_u32(req, NHA_ID, nexthop->id);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not append NHA_ID attribute: %m");
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r = sd_netlink_message_append_u32(req, NHA_OIF, link->ifindex);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not append NHA_OIF attribute: %m");
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if (in_addr_is_null(nexthop->family, &nexthop->gw) == 0) {
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r = netlink_message_append_in_addr_union(req, NHA_GATEWAY, nexthop->family, &nexthop->gw);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not append NHA_GATEWAY attribute: %m");
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r = sd_rtnl_message_nexthop_set_family(req, nexthop->family);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not set nexthop family: %m");
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}
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r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
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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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r = nexthop_add(link, nexthop, &nexthop);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not add nexthop: %m");
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return 1;
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}
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int nexthop_section_verify(NextHop *nh) {
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if (section_is_invalid(nh->section))
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return -EINVAL;
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if (in_addr_is_null(nh->family, &nh->gw) < 0)
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return -EINVAL;
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return 0;
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}
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int config_parse_nexthop_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_(nexthop_free_or_set_invalidp) NextHop *n = 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 = nexthop_new_static(network, filename, section_line, &n);
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if (r < 0)
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return r;
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r = safe_atou32(rvalue, &n->id);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r,
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"Could not parse nexthop id \"%s\", ignoring assignment: %m", rvalue);
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return 0;
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}
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TAKE_PTR(n);
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return 0;
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}
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int config_parse_nexthop_gateway(
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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_(nexthop_free_or_set_invalidp) NextHop *n = 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 = nexthop_new_static(network, filename, section_line, &n);
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if (r < 0)
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return r;
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r = in_addr_from_string_auto(rvalue, &n->family, &n->gw);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r,
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"Invalid %s='%s', ignoring assignment: %m", lvalue, rvalue);
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return 0;
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}
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TAKE_PTR(n);
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return 0;
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}
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