diff options
Diffstat (limited to 'src/network/networkd-neighbor.c')
| -rw-r--r-- | src/network/networkd-neighbor.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/src/network/networkd-neighbor.c b/src/network/networkd-neighbor.c new file mode 100644 index 0000000..254a60b --- /dev/null +++ b/src/network/networkd-neighbor.c @@ -0,0 +1,237 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include "sd-netlink.h" + +#include "alloc-util.h" +#include "conf-parser.h" +#include "ether-addr-util.h" +#include "hashmap.h" +#include "in-addr-util.h" +#include "netlink-util.h" +#include "networkd-link.h" +#include "networkd-manager.h" +#include "networkd-neighbor.h" + +void neighbor_free(Neighbor *neighbor) { + if (!neighbor) + return; + + if (neighbor->network) { + LIST_REMOVE(neighbors, neighbor->network->neighbors, neighbor); + assert(neighbor->network->n_neighbors > 0); + neighbor->network->n_neighbors--; + + if (neighbor->section) { + hashmap_remove(neighbor->network->neighbors_by_section, neighbor->section); + network_config_section_free(neighbor->section); + } + } + + free(neighbor); +} + +static int neighbor_new_static(Network *network, const char *filename, unsigned section_line, Neighbor **ret) { + _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL; + _cleanup_(neighbor_freep) Neighbor *neighbor = 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; + + neighbor = hashmap_get(network->neighbors_by_section, n); + if (neighbor) { + *ret = TAKE_PTR(neighbor); + + return 0; + } + } + + neighbor = new(Neighbor, 1); + if (!neighbor) + return -ENOMEM; + + *neighbor = (Neighbor) { + .network = network, + .family = AF_UNSPEC, + }; + + LIST_APPEND(neighbors, network->neighbors, neighbor); + network->n_neighbors++; + + if (filename) { + neighbor->section = TAKE_PTR(n); + + r = hashmap_ensure_allocated(&network->neighbors_by_section, &network_config_hash_ops); + if (r < 0) + return r; + + r = hashmap_put(network->neighbors_by_section, neighbor->section, neighbor); + if (r < 0) + return r; + } + + *ret = TAKE_PTR(neighbor); + + return 0; +} + +static int neighbor_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + assert(link); + assert(link->neighbor_messages > 0); + + link->neighbor_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_warning_errno(link, r, "Could not set neighbor: %m"); + + if (link->neighbor_messages == 0) { + log_link_debug(link, "Neighbors set"); + link->neighbors_configured = true; + link_check_ready(link); + } + + return 1; +} + +int neighbor_configure(Neighbor *neighbor, Link *link, link_netlink_message_handler_t callback) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + assert(neighbor); + assert(link); + assert(link->ifindex > 0); + assert(link->manager); + assert(link->manager->rtnl); + + if (neighbor->family == AF_UNSPEC) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Neighbor without Address= configured"); + if (!neighbor->mac_configured) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Neighbor without MACAddress= configured"); + + r = sd_rtnl_message_new_neigh(link->manager->rtnl, &req, RTM_NEWNEIGH, + link->ifindex, neighbor->family); + if (r < 0) + return log_error_errno(r, "Could not allocate RTM_NEWNEIGH message: %m"); + + r = sd_rtnl_message_neigh_set_state(req, NUD_PERMANENT); + if (r < 0) + return log_error_errno(r, "Could not set state: %m"); + + r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE); + if (r < 0) + return log_error_errno(r, "Could not set flags: %m"); + + r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, &neighbor->mac); + if (r < 0) + return log_error_errno(r, "Could not append NDA_LLADDR attribute: %m"); + + switch (neighbor->family) { + case AF_INET6: + r = sd_netlink_message_append_in6_addr(req, NDA_DST, &neighbor->in_addr.in6); + if (r < 0) + return log_error_errno(r, "Could not append NDA_DST attribute: %m"); + break; + case AF_INET: + r = sd_netlink_message_append_in_addr(req, NDA_DST, &neighbor->in_addr.in); + if (r < 0) + return log_error_errno(r, "Could not append NDA_DST attribute: %m"); + break; + default: + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Neighbor with invalid address family"); + } + + r = netlink_call_async(link->manager->rtnl, NULL, req, callback ?: neighbor_handler, + link_netlink_destroy_callback, link); + if (r < 0) + return log_error_errno(r, "Could not send rtnetlink message: %m"); + + link->neighbor_messages++; + link_ref(link); + + return 0; +} + +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_freep) 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 r; + + r = in_addr_from_string_auto(rvalue, &n->family, &n->in_addr); + if (r < 0) { + log_syntax(unit, LOG_ERR, filename, line, r, "Neighbor Address is invalid, ignoring assignment: %s", rvalue); + return 0; + } + + 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_freep) 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 r; + + r = ether_addr_from_string(rvalue, &n->mac); + if (r < 0) { + log_syntax(unit, LOG_ERR, filename, line, r, "Neighbor MACAddress is invalid, ignoring assignment: %s", rvalue); + return 0; + } + + n->mac_configured = true; + TAKE_PTR(n); + + return 0; +} |