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