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-rw-r--r--src/network/networkd-nexthop.c534
1 files changed, 534 insertions, 0 deletions
diff --git a/src/network/networkd-nexthop.c b/src/network/networkd-nexthop.c
new file mode 100644
index 0000000..4a09b4c
--- /dev/null
+++ b/src/network/networkd-nexthop.c
@@ -0,0 +1,534 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright © 2019 VMware, Inc.
+ */
+
+#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 "parse-util.h"
+#include "set.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);
+ set_remove(nexthop->link->nexthops_foreign, nexthop);
+ }
+
+ 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,
+ };
+
+ *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);
+
+ 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;
+}
+
+static void nexthop_hash_func(const NextHop *nexthop, struct siphash *state) {
+ assert(nexthop);
+
+ siphash24_compress(&nexthop->id, sizeof(nexthop->id), 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->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_HASH_OPS_WITH_KEY_DESTRUCTOR(
+ nexthop_hash_ops,
+ NextHop,
+ nexthop_hash_func,
+ nexthop_compare_func,
+ nexthop_free);
+
+static 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->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;
+}
+
+static int nexthop_add_foreign(Link *link, NextHop *in, NextHop **ret) {
+ return nexthop_add_internal(link, &link->nexthops_foreign, in, ret);
+}
+
+static 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_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->nexthop_messages > 0);
+
+ link->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->nexthop_messages == 0) {
+ log_link_debug(link, "Nexthop set");
+ link->static_nexthops_configured = true;
+ link_check_ready(link);
+ }
+
+ return 1;
+}
+
+static int nexthop_configure(NextHop *nexthop, Link *link) {
+ _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));
+
+ 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, nexthop_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);
+
+ r = nexthop_add(link, nexthop, &nexthop);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not add nexthop: %m");
+
+ return 1;
+}
+
+int link_set_nexthop(Link *link) {
+ NextHop *nh;
+ int r;
+
+ assert(link);
+ assert(link->network);
+
+ link->static_nexthops_configured = false;
+
+ HASHMAP_FOREACH(nh, link->network->nexthops_by_section) {
+ r = nexthop_configure(nh, link);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Could not set nexthop: %m");
+
+ link->nexthop_messages++;
+ }
+
+ if (link->nexthop_messages == 0) {
+ link->static_nexthops_configured = true;
+ link_check_ready(link);
+ } else {
+ log_link_debug(link, "Setting nexthop");
+ link_set_state(link, LINK_STATE_CONFIGURING);
+ }
+
+ return 1;
+}
+
+int manager_rtnl_process_nexthop(sd_netlink *rtnl, sd_netlink_message *message, Manager *m) {
+ _cleanup_(nexthop_freep) NextHop *tmp = NULL;
+ _cleanup_free_ char *gateway = NULL;
+ NextHop *nexthop = NULL;
+ uint32_t ifindex;
+ uint16_t type;
+ Link *link;
+ 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 == -ENODATA) {
+ log_warning_errno(r, "rtnl: received nexthop message without NHA_OIF attribute, ignoring: %m");
+ return 0;
+ } else if (r < 0) {
+ log_warning_errno(r, "rtnl: could not get NHA_OIF attribute, ignoring: %m");
+ return 0;
+ } else if (ifindex <= 0) {
+ log_warning("rtnl: received nexthop message with invalid ifindex %"PRIu32", ignoring.", ifindex);
+ return 0;
+ }
+
+ r = link_get(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_INET, AF_INET6))
+ return log_link_debug(link, "rtnl: received nexthop message with invalid family %d, ignoring.", tmp->family);
+
+ 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_read_u32(message, NHA_ID, &tmp->id);
+ if (r < 0 && r != -ENODATA) {
+ log_link_warning_errno(link, r, "rtnl: could not get NHA_ID attribute, ignoring: %m");
+ return 0;
+ }
+
+ (void) nexthop_get(link, tmp, &nexthop);
+
+ if (DEBUG_LOGGING)
+ (void) in_addr_to_string(tmp->family, &tmp->gw, &gateway);
+
+ switch (type) {
+ case RTM_NEWNEXTHOP:
+ if (nexthop)
+ log_link_debug(link, "Received remembered nexthop: %s, id: %d", strna(gateway), tmp->id);
+ else {
+ log_link_debug(link, "Remembering foreign nexthop: %s, id: %d", strna(gateway), tmp->id);
+ r = nexthop_add_foreign(link, tmp, &nexthop);
+ if (r < 0) {
+ log_link_warning_errno(link, r, "Could not remember foreign nexthop, ignoring: %m");
+ return 0;
+ }
+ }
+ break;
+ case RTM_DELNEXTHOP:
+ if (nexthop) {
+ log_link_debug(link, "Forgetting nexthop: %s, id: %d", strna(gateway), tmp->id);
+ nexthop_free(nexthop);
+ } else
+ log_link_debug(link, "Kernel removed a nexthop we don't remember: %s, id: %d, ignoring.",
+ strna(gateway), tmp->id);
+ break;
+
+ default:
+ assert_not_reached("Received invalid RTNL message type");
+ }
+
+ return 1;
+}
+
+static 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;
+}
+
+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;
+ 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;
+}
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