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systemd/src/network/networkd-nexthop.c

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/* SPDX-License-Identifier: LGPL-2.1-or-later
* Copyright © 2019 VMware, Inc.
*/
#include <net/if.h>
#include <linux/nexthop.h>
#include "alloc-util.h"
#include "netlink-util.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-network.h"
#include "networkd-nexthop.h"
#include "networkd-queue.h"
#include "networkd-route-util.h"
#include "parse-util.h"
#include "set.h"
#include "stdio-util.h"
#include "string-util.h"
NextHop *nexthop_free(NextHop *nexthop) {
if (!nexthop)
return NULL;
if (nexthop->network) {
assert(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);
if (nexthop->link->manager && nexthop->id > 0)
hashmap_remove(nexthop->link->manager->nexthops_by_id, UINT32_TO_PTR(nexthop->id));
}
if (nexthop->manager) {
set_remove(nexthop->manager->nexthops, nexthop);
if (nexthop->id > 0)
hashmap_remove(nexthop->manager->nexthops_by_id, UINT32_TO_PTR(nexthop->id));
}
hashmap_free_free(nexthop->group);
return mfree(nexthop);
}
DEFINE_NETWORK_SECTION_FUNCTIONS(NextHop, nexthop_free);
static int nexthop_new(NextHop **ret) {
_cleanup_(nexthop_freep) NextHop *nexthop = NULL;
nexthop = new(NextHop, 1);
if (!nexthop)
return -ENOMEM;
*nexthop = (NextHop) {
.family = AF_UNSPEC,
.onlink = -1,
};
*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);
assert(section_line > 0);
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;
nexthop->section = TAKE_PTR(n);
nexthop->source = NETWORK_CONFIG_SOURCE_STATIC;
r = hashmap_ensure_put(&network->nexthops_by_section, &network_config_hash_ops, nexthop->section, nexthop);
if (r < 0)
return r;
*ret = TAKE_PTR(nexthop);
return 0;
}
void nexthop_hash_func(const NextHop *nexthop, struct siphash *state) {
assert(nexthop);
siphash24_compress(&nexthop->protocol, sizeof(nexthop->protocol), state);
siphash24_compress(&nexthop->id, sizeof(nexthop->id), state);
siphash24_compress(&nexthop->blackhole, sizeof(nexthop->blackhole), 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;
}
}
int nexthop_compare_func(const NextHop *a, const NextHop *b) {
int r;
r = CMP(a->protocol, b->protocol);
if (r != 0)
return r;
r = CMP(a->id, b->id);
if (r != 0)
return r;
r = CMP(a->blackhole, b->blackhole);
if (r != 0)
return r;
r = CMP(a->family, b->family);
if (r != 0)
return r;
if (IN_SET(a->family, AF_INET, AF_INET6))
return memcmp(&a->gw, &b->gw, FAMILY_ADDRESS_SIZE(a->family));
return 0;
}
DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR(
nexthop_hash_ops,
NextHop,
nexthop_hash_func,
nexthop_compare_func,
nexthop_free);
static bool nexthop_equal(const NextHop *a, const NextHop *b) {
if (a == b)
return true;
if (!a || !b)
return false;
return nexthop_compare_func(a, b) == 0;
}
static int nexthop_dup(const NextHop *src, NextHop **ret) {
_cleanup_(nexthop_freep) NextHop *dest = NULL;
struct nexthop_grp *nhg;
int r;
assert(src);
assert(ret);
dest = newdup(NextHop, src, 1);
if (!dest)
return -ENOMEM;
/* unset all pointers */
dest->manager = NULL;
dest->link = NULL;
dest->network = NULL;
dest->section = NULL;
dest->group = NULL;
HASHMAP_FOREACH(nhg, src->group) {
_cleanup_free_ struct nexthop_grp *g = NULL;
g = newdup(struct nexthop_grp, nhg, 1);
if (!g)
return -ENOMEM;
r = hashmap_ensure_put(&dest->group, NULL, UINT32_TO_PTR(g->id), g);
if (r < 0)
return r;
if (r > 0)
TAKE_PTR(g);
}
*ret = TAKE_PTR(dest);
return 0;
}
int manager_get_nexthop_by_id(Manager *manager, uint32_t id, NextHop **ret) {
NextHop *nh;
assert(manager);
if (id == 0)
return -EINVAL;
nh = hashmap_get(manager->nexthops_by_id, UINT32_TO_PTR(id));
if (!nh)
return -ENOENT;
if (ret)
*ret = nh;
return 0;
}
static bool nexthop_owned_by_link(const NextHop *nexthop) {
return !nexthop->blackhole && hashmap_isempty(nexthop->group);
}
static int nexthop_get(Manager *manager, Link *link, NextHop *in, NextHop **ret) {
NextHop *nexthop;
Set *nexthops;
assert(in);
if (nexthop_owned_by_link(in)) {
if (!link)
return -ENOENT;
nexthops = link->nexthops;
} else {
if (!manager)
return -ENOENT;
nexthops = manager->nexthops;
}
nexthop = set_get(nexthops, in);
if (nexthop) {
if (ret)
*ret = nexthop;
return 0;
}
if (in->id > 0)
return -ENOENT;
/* Also find nexthop configured without ID. */
SET_FOREACH(nexthop, nexthops) {
uint32_t id;
bool found;
id = nexthop->id;
nexthop->id = 0;
found = nexthop_equal(nexthop, in);
nexthop->id = id;
if (!found)
continue;
if (ret)
*ret = nexthop;
return 0;
}
return -ENOENT;
}
static int nexthop_add(Manager *manager, Link *link, NextHop *nexthop) {
int r;
assert(nexthop);
assert(nexthop->id > 0);
if (nexthop_owned_by_link(nexthop)) {
assert(link);
r = set_ensure_put(&link->nexthops, &nexthop_hash_ops, nexthop);
if (r < 0)
return r;
if (r == 0)
return -EEXIST;
nexthop->link = link;
manager = link->manager;
} else {
assert(manager);
r = set_ensure_put(&manager->nexthops, &nexthop_hash_ops, nexthop);
if (r < 0)
return r;
if (r == 0)
return -EEXIST;
nexthop->manager = manager;
}
return hashmap_ensure_put(&manager->nexthops_by_id, NULL, UINT32_TO_PTR(nexthop->id), nexthop);
}
static int nexthop_acquire_id(Manager *manager, NextHop *nexthop) {
_cleanup_set_free_ Set *ids = NULL;
Network *network;
uint32_t id;
int r;
assert(manager);
assert(nexthop);
if (nexthop->id > 0)
return 0;
/* Find the lowest unused ID. */
ORDERED_HASHMAP_FOREACH(network, manager->networks) {
NextHop *tmp;
HASHMAP_FOREACH(tmp, network->nexthops_by_section) {
if (tmp->id == 0)
continue;
r = set_ensure_put(&ids, NULL, UINT32_TO_PTR(tmp->id));
if (r < 0)
return r;
}
}
for (id = 1; id < UINT32_MAX; id++) {
if (manager_get_nexthop_by_id(manager, id, NULL) >= 0)
continue;
if (set_contains(ids, UINT32_TO_PTR(id)))
continue;
break;
}
nexthop->id = id;
return 0;
}
static void log_nexthop_debug(const NextHop *nexthop, const char *str, const Link *link) {
_cleanup_free_ char *state = NULL, *gw = NULL, *group = NULL, *flags = NULL;
struct nexthop_grp *nhg;
assert(nexthop);
assert(str);
/* link may be NULL. */
if (!DEBUG_LOGGING)
return;
(void) network_config_state_to_string_alloc(nexthop->state, &state);
(void) in_addr_to_string(nexthop->family, &nexthop->gw, &gw);
(void) route_flags_to_string_alloc(nexthop->flags, &flags);
HASHMAP_FOREACH(nhg, nexthop->group)
(void) strextendf_with_separator(&group, ",", "%"PRIu32":%"PRIu32, nhg->id, nhg->weight+1);
log_link_debug(link, "%s %s nexthop (%s): id: %"PRIu32", gw: %s, blackhole: %s, group: %s, flags: %s",
str, strna(network_config_source_to_string(nexthop->source)), strna(state),
nexthop->id, strna(gw), yes_no(nexthop->blackhole), strna(group), strna(flags));
}
static int nexthop_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(m);
/* link may be NULL. */
if (link && IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -ENOENT)
log_link_message_warning_errno(link, m, r, "Could not drop nexthop, ignoring");
return 1;
}
static int nexthop_remove(NextHop *nexthop) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
Manager *manager;
Link *link;
int r;
assert(nexthop);
assert(nexthop->manager || (nexthop->link && nexthop->link->manager));
/* link may be NULL. */
link = nexthop->link;
manager = nexthop->manager ?: nexthop->link->manager;
if (nexthop->id == 0) {
log_link_debug(link, "Cannot remove nexthop without valid ID, ignoring.");
return 0;
}
log_nexthop_debug(nexthop, "Removing", link);
r = sd_rtnl_message_new_nexthop(manager->rtnl, &req, RTM_DELNEXTHOP, AF_UNSPEC, RTPROT_UNSPEC);
if (r < 0)
return log_link_error_errno(link, r, "Could not create RTM_DELNEXTHOP 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 = netlink_call_async(manager->rtnl, NULL, req, nexthop_remove_handler,
link ? link_netlink_destroy_callback : NULL, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link); /* link may be NULL, link_ref() is OK with that */
nexthop_enter_removing(nexthop);
return 0;
}
static 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_UNSPEC, AF_INET, AF_INET6));
assert(callback);
log_nexthop_debug(nexthop, "Configuring", link);
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");
if (nexthop->id > 0) {
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");
}
if (!hashmap_isempty(nexthop->group)) {
_cleanup_free_ struct nexthop_grp *group = NULL;
struct nexthop_grp *p, *nhg;
group = new(struct nexthop_grp, hashmap_size(nexthop->group));
if (!group)
return log_oom();
p = group;
HASHMAP_FOREACH(nhg, nexthop->group)
*p++ = *nhg;
r = sd_netlink_message_append_data(req, NHA_GROUP, group, sizeof(struct nexthop_grp) * hashmap_size(nexthop->group));
if (r < 0)
return log_link_error_errno(link, r, "Could not append NHA_GROUP attribute: %m");
} else if (nexthop->blackhole) {
r = sd_netlink_message_append_flag(req, NHA_BLACKHOLE);
if (r < 0)
return log_link_error_errno(link, r, "Could not append NHA_BLACKHOLE attribute: %m");
} else {
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_set(nexthop->family, &nexthop->gw)) {
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_flags(req, nexthop->flags & RTNH_F_ONLINK);
if (r < 0)
return log_link_error_errno(link, r, "Failed to set nexthop flags: %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);
nexthop_enter_configuring(nexthop);
return 0;
}
static int static_nexthop_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
assert(link->static_nexthop_messages > 0);
link->static_nexthop_messages--;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_link_message_warning_errno(link, m, r, "Could not set nexthop");
link_enter_failed(link);
return 1;
}
if (link->static_nexthop_messages == 0) {
log_link_debug(link, "Nexthops set");
link->static_nexthops_configured = true;
link_check_ready(link);
}
return 1;
}
static int link_request_nexthop(
Link *link,
NextHop *nexthop,
unsigned *message_counter,
link_netlink_message_handler_t netlink_handler,
Request **ret) {
NextHop *existing;
int r;
assert(link);
assert(nexthop);
assert(nexthop->source != NETWORK_CONFIG_SOURCE_FOREIGN);
if (nexthop_get(link->manager, link, nexthop, &existing) < 0) {
_cleanup_(nexthop_freep) NextHop *tmp = NULL;
r = nexthop_dup(nexthop, &tmp);
if (r < 0)
return r;
r = nexthop_acquire_id(link->manager, tmp);
if (r < 0)
return r;
r = nexthop_add(link->manager, link, tmp);
if (r < 0)
return r;
existing = TAKE_PTR(tmp);
} else
existing->source = nexthop->source;
log_nexthop_debug(existing, "Requesting", link);
r = link_queue_request(link, REQUEST_TYPE_NEXTHOP, existing, false,
message_counter, netlink_handler, ret);
if (r <= 0)
return r;
nexthop_enter_requesting(existing);
return 1;
}
int link_request_static_nexthops(Link *link, bool only_ipv4) {
NextHop *nh;
int r;
assert(link);
assert(link->network);
link->static_nexthops_configured = false;
HASHMAP_FOREACH(nh, link->network->nexthops_by_section) {
if (only_ipv4 && nh->family != AF_INET)
continue;
r = link_request_nexthop(link, nh, &link->static_nexthop_messages,
static_nexthop_handler, NULL);
if (r < 0)
return log_link_warning_errno(link, r, "Could not request nexthop: %m");
}
if (link->static_nexthop_messages == 0) {
link->static_nexthops_configured = true;
link_check_ready(link);
} else {
log_link_debug(link, "Requesting nexthops");
link_set_state(link, LINK_STATE_CONFIGURING);
}
return 0;
}
static void manager_mark_nexthops(Manager *manager, bool foreign, const Link *except) {
NextHop *nexthop;
Link *link;
assert(manager);
/* First, mark all nexthops. */
SET_FOREACH(nexthop, manager->nexthops) {
/* do not touch nexthop created by the kernel */
if (nexthop->protocol == RTPROT_KERNEL)
continue;
/* When 'foreign' is true, do not remove nexthops we configured. */
if (foreign && nexthop->source != NETWORK_CONFIG_SOURCE_FOREIGN)
continue;
/* Ignore nexthops not assigned yet or already removed. */
if (!nexthop_exists(nexthop))
continue;
nexthop_mark(nexthop);
}
/* Then, unmark all nexthops requested by active links. */
HASHMAP_FOREACH(link, manager->links_by_index) {
if (link == except)
continue;
if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
continue;
HASHMAP_FOREACH(nexthop, link->network->nexthops_by_section) {
NextHop *existing;
if (nexthop_get(manager, NULL, nexthop, &existing) >= 0)
nexthop_unmark(existing);
}
}
}
static int manager_drop_nexthops(Manager *manager) {
NextHop *nexthop;
int k, r = 0;
assert(manager);
SET_FOREACH(nexthop, manager->nexthops) {
if (!nexthop_is_marked(nexthop))
continue;
k = nexthop_remove(nexthop);
if (k < 0 && r >= 0)
r = k;
}
return r;
}
int link_drop_foreign_nexthops(Link *link) {
NextHop *nexthop;
int k, r = 0;
assert(link);
assert(link->manager);
assert(link->network);
/* First, mark all nexthops. */
SET_FOREACH(nexthop, link->nexthops) {
/* do not touch nexthop created by the kernel */
if (nexthop->protocol == RTPROT_KERNEL)
continue;
/* Do not remove nexthops we configured. */
if (nexthop->source != NETWORK_CONFIG_SOURCE_FOREIGN)
continue;
/* Ignore nexthops not assigned yet or already removed. */
if (!nexthop_exists(nexthop))
continue;
nexthop_mark(nexthop);
}
/* Then, unmark all nexthops requested by active links. */
HASHMAP_FOREACH(nexthop, link->network->nexthops_by_section) {
NextHop *existing;
if (nexthop_get(NULL, link, nexthop, &existing) >= 0)
nexthop_unmark(existing);
}
/* Finally, remove all marked rules. */
SET_FOREACH(nexthop, link->nexthops) {
if (!nexthop_is_marked(nexthop))
continue;
k = nexthop_remove(nexthop);
if (k < 0 && r >= 0)
r = k;
}
manager_mark_nexthops(link->manager, /* foreign = */ true, NULL);
k = manager_drop_nexthops(link->manager);
if (k < 0 && r >= 0)
r = k;
return r;
}
int link_drop_nexthops(Link *link) {
NextHop *nexthop;
int k, r = 0;
assert(link);
assert(link->manager);
SET_FOREACH(nexthop, link->nexthops) {
/* do not touch nexthop created by the kernel */
if (nexthop->protocol == RTPROT_KERNEL)
continue;
/* Ignore nexthops not assigned yet or already removing. */
if (!nexthop_exists(nexthop))
continue;
k = nexthop_remove(nexthop);
if (k < 0 && r >= 0)
r = k;
}
manager_mark_nexthops(link->manager, /* foreign = */ false, link);
k = manager_drop_nexthops(link->manager);
if (k < 0 && r >= 0)
r = k;
return r;
}
void link_foreignize_nexthops(Link *link) {
NextHop *nexthop;
assert(link);
SET_FOREACH(nexthop, link->nexthops)
nexthop->source = NETWORK_CONFIG_SOURCE_FOREIGN;
manager_mark_nexthops(link->manager, /* foreign = */ false, link);
SET_FOREACH(nexthop, link->manager->nexthops) {
if (!nexthop_is_marked(nexthop))
continue;
nexthop->source = NETWORK_CONFIG_SOURCE_FOREIGN;
}
}
static bool nexthop_is_ready_to_configure(Link *link, const NextHop *nexthop) {
struct nexthop_grp *nhg;
assert(link);
assert(nexthop);
if (!link_is_ready_to_configure(link, false))
return false;
if (nexthop_owned_by_link(nexthop)) {
/* TODO: fdb nexthop does not require IFF_UP. The conditions below needs to be updated
* when fdb nexthop support is added. See rtm_to_nh_config() in net/ipv4/nexthop.c of
* kernel. */
if (link->set_flags_messages > 0)
return false;
if (!FLAGS_SET(link->flags, IFF_UP))
return false;
}
/* All group members must be configured first. */
HASHMAP_FOREACH(nhg, nexthop->group) {
NextHop *g;
if (manager_get_nexthop_by_id(link->manager, nhg->id, &g) < 0)
return false;
if (!nexthop_exists(g))
return false;
}
if (nexthop->id == 0) {
Request *req;
ORDERED_SET_FOREACH(req, link->manager->request_queue) {
if (req->type != REQUEST_TYPE_NEXTHOP)
continue;
if (req->nexthop->id != 0)
return false; /* first configure nexthop with id. */
}
}
return gateway_is_ready(link, FLAGS_SET(nexthop->flags, RTNH_F_ONLINK), nexthop->family, &nexthop->gw);
}
int request_process_nexthop(Request *req) {
int r;
assert(req);
assert(req->link);
assert(req->nexthop);
assert(req->type == REQUEST_TYPE_NEXTHOP);
if (!nexthop_is_ready_to_configure(req->link, req->nexthop))
return 0;
r = nexthop_configure(req->nexthop, req->link, req->netlink_handler);
if (r < 0)
return r;
return 1;
}
int manager_rtnl_process_nexthop(sd_netlink *rtnl, sd_netlink_message *message, Manager *m) {
_cleanup_(nexthop_freep) NextHop *tmp = NULL;
_cleanup_free_ void *raw_group = NULL;
NextHop *nexthop = NULL;
size_t raw_group_size;
uint32_t ifindex;
uint16_t type;
Link *link = NULL;
int r;
assert(rtnl);
assert(message);
assert(m);
if (sd_netlink_message_is_error(message)) {
r = sd_netlink_message_get_errno(message);
if (r < 0)
log_message_warning_errno(message, r, "rtnl: failed to receive rule message, ignoring");
return 0;
}
r = sd_netlink_message_get_type(message, &type);
if (r < 0) {
log_warning_errno(r, "rtnl: could not get message type, ignoring: %m");
return 0;
} else if (!IN_SET(type, RTM_NEWNEXTHOP, RTM_DELNEXTHOP)) {
log_warning("rtnl: received unexpected message type %u when processing nexthop, ignoring.", type);
return 0;
}
r = sd_netlink_message_read_u32(message, NHA_OIF, &ifindex);
if (r < 0 && r != -ENODATA) {
log_warning_errno(r, "rtnl: could not get NHA_OIF attribute, ignoring: %m");
return 0;
} else if (r >= 0) {
if (ifindex <= 0) {
log_warning("rtnl: received nexthop message with invalid ifindex %"PRIu32", ignoring.", ifindex);
return 0;
}
r = link_get_by_index(m, ifindex, &link);
if (r < 0 || !link) {
if (!m->enumerating)
log_warning("rtnl: received nexthop message for link (%"PRIu32") we do not know about, ignoring", ifindex);
return 0;
}
}
r = nexthop_new(&tmp);
if (r < 0)
return log_oom();
r = sd_rtnl_message_get_family(message, &tmp->family);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: could not get nexthop family, ignoring: %m");
return 0;
} else if (!IN_SET(tmp->family, AF_UNSPEC, AF_INET, AF_INET6)) {
log_link_debug(link, "rtnl: received nexthop message with invalid family %d, ignoring.", tmp->family);
return 0;
}
r = sd_rtnl_message_nexthop_get_protocol(message, &tmp->protocol);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: could not get nexthop protocol, ignoring: %m");
return 0;
}
r = sd_rtnl_message_nexthop_get_flags(message, &tmp->flags);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: could not get nexthop flags, ignoring: %m");
return 0;
}
r = sd_netlink_message_read_data(message, NHA_GROUP, &raw_group_size, &raw_group);
if (r < 0 && r != -ENODATA) {
log_link_warning_errno(link, r, "rtnl: could not get NHA_GROUP attribute, ignoring: %m");
return 0;
} else if (r >= 0) {
struct nexthop_grp *group = raw_group;
size_t n_group;
if (raw_group_size == 0 || raw_group_size % sizeof(struct nexthop_grp) != 0) {
log_link_warning(link, "rtnl: received nexthop message with invalid nexthop group size, ignoring.");
return 0;
}
assert((uintptr_t) group % __alignof__(struct nexthop_grp) == 0);
n_group = raw_group_size / sizeof(struct nexthop_grp);
for (size_t i = 0; i < n_group; i++) {
_cleanup_free_ struct nexthop_grp *nhg = NULL;
if (group[i].id == 0) {
log_link_warning(link, "rtnl: received nexthop message with invalid ID in group, ignoring.");
return 0;
}
if (group[i].weight > 254) {
log_link_warning(link, "rtnl: received nexthop message with invalid weight in group, ignoring.");
return 0;
}
nhg = newdup(struct nexthop_grp, group + i, 1);
if (!nhg)
return log_oom();
r = hashmap_ensure_put(&tmp->group, NULL, UINT32_TO_PTR(nhg->id), nhg);
if (r == -ENOMEM)
return log_oom();
if (r < 0) {
log_link_warning_errno(link, r, "Failed to store nexthop group, ignoring: %m");
return 0;
}
if (r > 0)
TAKE_PTR(nhg);
}
}
if (tmp->family != AF_UNSPEC) {
r = netlink_message_read_in_addr_union(message, NHA_GATEWAY, tmp->family, &tmp->gw);
if (r < 0 && r != -ENODATA) {
log_link_warning_errno(link, r, "rtnl: could not get NHA_GATEWAY attribute, ignoring: %m");
return 0;
}
}
r = sd_netlink_message_has_flag(message, NHA_BLACKHOLE);
if (r < 0) {
log_link_warning_errno(link, r, "rtnl: could not get NHA_BLACKHOLE attribute, ignoring: %m");
return 0;
}
tmp->blackhole = r;
r = sd_netlink_message_read_u32(message, NHA_ID, &tmp->id);
if (r == -ENODATA) {
log_link_warning_errno(link, r, "rtnl: received nexthop message without NHA_ID attribute, ignoring: %m");
return 0;
} else if (r < 0) {
log_link_warning_errno(link, r, "rtnl: could not get NHA_ID attribute, ignoring: %m");
return 0;
} else if (tmp->id == 0) {
log_link_warning(link, "rtnl: received nexthop message with invalid nexthop ID, ignoring: %m");
return 0;
}
/* All blackhole or group nexthops are managed by Manager. Note that the linux kernel does not
* set NHA_OID attribute when NHA_BLACKHOLE or NHA_GROUP is set. Just for safety. */
if (!nexthop_owned_by_link(tmp))
link = NULL;
(void) nexthop_get(m, link, tmp, &nexthop);
switch (type) {
case RTM_NEWNEXTHOP:
if (nexthop) {
nexthop->flags = tmp->flags;
nexthop_enter_configured(nexthop);
log_nexthop_debug(tmp, "Received remembered", link);
} else {
nexthop_enter_configured(tmp);
log_nexthop_debug(tmp, "Remembering", link);
r = nexthop_add(m, link, tmp);
if (r < 0) {
log_link_warning_errno(link, r, "Could not remember foreign nexthop, ignoring: %m");
return 0;
}
TAKE_PTR(tmp);
}
break;
case RTM_DELNEXTHOP:
if (nexthop) {
nexthop_enter_removed(nexthop);
if (nexthop->state == 0) {
log_nexthop_debug(nexthop, "Forgetting", link);
nexthop_free(nexthop);
} else
log_nexthop_debug(nexthop, "Removed", link);
} else
log_nexthop_debug(tmp, "Kernel removed unknown", link);
break;
default:
assert_not_reached();
}
return 1;
}
static int nexthop_section_verify(NextHop *nh) {
if (section_is_invalid(nh->section))
return -EINVAL;
if (!hashmap_isempty(nh->group)) {
if (in_addr_is_set(nh->family, &nh->gw))
return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
"%s: nexthop group cannot have gateway address. "
"Ignoring [NextHop] section from line %u.",
nh->section->filename, nh->section->line);
if (nh->family != AF_UNSPEC)
return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
"%s: nexthop group cannot have Family= setting. "
"Ignoring [NextHop] section from line %u.",
nh->section->filename, nh->section->line);
if (nh->blackhole && in_addr_is_set(nh->family, &nh->gw))
return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
"%s: nexthop group cannot be a blackhole. "
"Ignoring [NextHop] section from line %u.",
nh->section->filename, nh->section->line);
} else if (nh->family == AF_UNSPEC)
/* When neither Family=, Gateway=, nor Group= is specified, assume IPv4. */
nh->family = AF_INET;
if (nh->blackhole && in_addr_is_set(nh->family, &nh->gw))
return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
"%s: blackhole nexthop cannot have gateway address. "
"Ignoring [NextHop] section from line %u.",
nh->section->filename, nh->section->line);
if (nh->onlink < 0 && in_addr_is_set(nh->family, &nh->gw) &&
ordered_hashmap_isempty(nh->network->addresses_by_section)) {
/* If no address is configured, in most cases the gateway cannot be reachable.
* TODO: we may need to improve the condition above. */
log_warning("%s: Gateway= without static address configured. "
"Enabling OnLink= option.",
nh->section->filename);
nh->onlink = true;
}
if (nh->onlink >= 0)
SET_FLAG(nh->flags, RTNH_F_ONLINK, nh->onlink);
return 0;
}
void network_drop_invalid_nexthops(Network *network) {
NextHop *nh;
assert(network);
HASHMAP_FOREACH(nh, network->nexthops_by_section)
if (nexthop_section_verify(nh) < 0)
nexthop_free(nh);
}
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;
uint32_t id;
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();
if (isempty(rvalue)) {
n->id = 0;
TAKE_PTR(n);
return 0;
}
r = safe_atou32(rvalue, &id);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Could not parse nexthop id \"%s\", ignoring assignment: %m", rvalue);
return 0;
}
if (id == 0) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Invalid nexthop id \"%s\", ignoring assignment: %m", rvalue);
return 0;
}
n->id = id;
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();
if (isempty(rvalue)) {
n->family = AF_UNSPEC;
n->gw = IN_ADDR_NULL;
TAKE_PTR(n);
return 0;
}
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;
}
int config_parse_nexthop_family(
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;
AddressFamily a;
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();
if (isempty(rvalue) &&
!in_addr_is_set(n->family, &n->gw)) {
/* Accept an empty string only when Gateway= is null or not specified. */
n->family = AF_UNSPEC;
TAKE_PTR(n);
return 0;
}
a = nexthop_address_family_from_string(rvalue);
if (a < 0) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Invalid %s='%s', ignoring assignment: %m", lvalue, rvalue);
return 0;
}
if (in_addr_is_set(n->family, &n->gw) &&
((a == ADDRESS_FAMILY_IPV4 && n->family == AF_INET6) ||
(a == ADDRESS_FAMILY_IPV6 && n->family == AF_INET))) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Specified family '%s' conflicts with the family of the previously specified Gateway=, "
"ignoring assignment.", rvalue);
return 0;
}
switch(a) {
case ADDRESS_FAMILY_IPV4:
n->family = AF_INET;
break;
case ADDRESS_FAMILY_IPV6:
n->family = AF_INET6;
break;
default:
assert_not_reached();
}
TAKE_PTR(n);
return 0;
}
int config_parse_nexthop_onlink(
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();
if (isempty(rvalue)) {
n->onlink = -1;
TAKE_PTR(n);
return 0;
}
r = parse_boolean(rvalue);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue);
return 0;
}
n->onlink = r;
TAKE_PTR(n);
return 0;
}
int config_parse_nexthop_blackhole(
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 = parse_boolean(rvalue);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue);
return 0;
}
n->blackhole = r;
TAKE_PTR(n);
return 0;
}
int config_parse_nexthop_group(
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();
if (isempty(rvalue)) {
n->group = hashmap_free_free(n->group);
TAKE_PTR(n);
return 0;
}
for (const char *p = rvalue;;) {
_cleanup_free_ struct nexthop_grp *nhg = NULL;
_cleanup_free_ char *word = NULL;
uint32_t w;
char *sep;
r = extract_first_word(&p, &word, NULL, 0);
if (r == -ENOMEM)
return log_oom();
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Invalid %s=, ignoring assignment: %s", lvalue, rvalue);
return 0;
}
if (r == 0)
break;
nhg = new0(struct nexthop_grp, 1);
if (!nhg)
return log_oom();
sep = strchr(word, ':');
if (sep) {
*sep++ = '\0';
r = safe_atou32(sep, &w);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse weight for nexthop group, ignoring assignment: %s:%s",
word, sep);
continue;
}
if (w == 0 || w > 256) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Invalid weight for nexthop group, ignoring assignment: %s:%s",
word, sep);
continue;
}
/* See comments in config_parse_multipath_route(). */
nhg->weight = w - 1;
}
r = safe_atou32(word, &nhg->id);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse nexthop ID in %s=, ignoring assignment: %s%s%s",
lvalue, word, sep ? ":" : "", strempty(sep));
continue;
}
if (nhg->id == 0) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Nexthop ID in %s= must be positive, ignoring assignment: %s%s%s",
lvalue, word, sep ? ":" : "", strempty(sep));
continue;
}
r = hashmap_ensure_put(&n->group, NULL, UINT32_TO_PTR(nhg->id), nhg);
if (r == -ENOMEM)
return log_oom();
if (r == -EEXIST) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Nexthop ID %"PRIu32" is specified multiple times in %s=, ignoring assignment: %s%s%s",
nhg->id, lvalue, word, sep ? ":" : "", strempty(sep));
continue;
}
assert(r > 0);
TAKE_PTR(nhg);
}
TAKE_PTR(n);
return 0;
}
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