[thirdparty/systemd.git] / src / network / networkd-neighbor.c

/* 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");

        r = netlink_message_append_in_addr_union(req, NDA_DST, neighbor->family, &neighbor->in_addr);
        if (r < 0)
                return log_error_errno(r, "Could not append NDA_DST attribute: %m");

        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_free_or_set_invalidp) 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_free_or_set_invalidp) 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;
}
Commit	Line	Data
e4a71bf3 WKI	1	/* SPDX-License-Identifier: LGPL-2.1+ */
	2
	3	#include "sd-netlink.h"
	4
	5	#include "alloc-util.h"
	6	#include "conf-parser.h"
	7	#include "ether-addr-util.h"
	8	#include "hashmap.h"
	9	#include "in-addr-util.h"
	10	#include "netlink-util.h"
	11	#include "networkd-link.h"
	12	#include "networkd-manager.h"
	13	#include "networkd-neighbor.h"
	14
	15	void neighbor_free(Neighbor *neighbor) {
	16	if (!neighbor)
	17	return;
	18
	19	if (neighbor->network) {
	20	LIST_REMOVE(neighbors, neighbor->network->neighbors, neighbor);
	21	assert(neighbor->network->n_neighbors > 0);
	22	neighbor->network->n_neighbors--;
	23
	24	if (neighbor->section) {
	25	hashmap_remove(neighbor->network->neighbors_by_section, neighbor->section);
	26	network_config_section_free(neighbor->section);
	27	}
	28	}
	29
	30	free(neighbor);
	31	}
	32
	33	static int neighbor_new_static(Network network, const char filename, unsigned section_line, Neighbor **ret) {
	34	_cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
	35	_cleanup_(neighbor_freep) Neighbor *neighbor = NULL;
	36	int r;
	37
	38	assert(network);
	39	assert(ret);
	40	assert(!!filename == (section_line > 0));
	41
	42	if (filename) {
	43	r = network_config_section_new(filename, section_line, &n);
	44	if (r < 0)
	45	return r;
	46
	47	neighbor = hashmap_get(network->neighbors_by_section, n);
	48	if (neighbor) {
	49	*ret = TAKE_PTR(neighbor);
	50
	51	return 0;
	52	}
	53	}
	54
	55	neighbor = new(Neighbor, 1);
	56	if (!neighbor)
	57	return -ENOMEM;
	58
	59	*neighbor = (Neighbor) {
	60	.network = network,
	61	.family = AF_UNSPEC,
	62	};
	63
	64	LIST_APPEND(neighbors, network->neighbors, neighbor);
65	network->n_neighbors++;
66
67	if (filename) {
68	neighbor->section = TAKE_PTR(n);
69
70	r = hashmap_ensure_allocated(&network->neighbors_by_section, &network_config_hash_ops);
71	if (r < 0)
72	return r;
73
74	r = hashmap_put(network->neighbors_by_section, neighbor->section, neighbor);
75	if (r < 0)
76	return r;
77	}
78
79	*ret = TAKE_PTR(neighbor);
80
81	return 0;
82	}
83
84	static int neighbor_handler(sd_netlink rtnl, sd_netlink_message m, Link *link) {
85	int r;
86
87	assert(link);
88	assert(link->neighbor_messages > 0);
89
90	link->neighbor_messages--;
91
92	if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
93	return 1;
94
95	r = sd_netlink_message_get_errno(m);
96	if (r < 0 && r != -EEXIST)
97	log_link_warning_errno(link, r, "Could not set neighbor: %m");
98
99	if (link->neighbor_messages == 0) {
100	log_link_debug(link, "Neighbors set");
101	link->neighbors_configured = true;
102	link_check_ready(link);
103	}
104
105	return 1;
106	}
107
108	int neighbor_configure(Neighbor neighbor, Link link, link_netlink_message_handler_t callback) {
109	_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
110	int r;
111
112	assert(neighbor);
113	assert(link);
114	assert(link->ifindex > 0);
115	assert(link->manager);
116	assert(link->manager->rtnl);
117
118	if (neighbor->family == AF_UNSPEC)
119	return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Neighbor without Address= configured");
120	if (!neighbor->mac_configured)
121	return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Neighbor without MACAddress= configured");
122
123	r = sd_rtnl_message_new_neigh(link->manager->rtnl, &req, RTM_NEWNEIGH,
124	link->ifindex, neighbor->family);
125	if (r < 0)
126	return log_error_errno(r, "Could not allocate RTM_NEWNEIGH message: %m");
127
128	r = sd_rtnl_message_neigh_set_state(req, NUD_PERMANENT);
129	if (r < 0)
130	return log_error_errno(r, "Could not set state: %m");
131
132	r = sd_netlink_message_set_flags(req, NLM_F_REQUEST \| NLM_F_CREATE \| NLM_F_REPLACE);
133	if (r < 0)
134	return log_error_errno(r, "Could not set flags: %m");
135
136	r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, &neighbor->mac);
137	if (r < 0)
138	return log_error_errno(r, "Could not append NDA_LLADDR attribute: %m");
139
43409486 YW	140	r = netlink_message_append_in_addr_union(req, NDA_DST, neighbor->family, &neighbor->in_addr);
	141	if (r < 0)
	142	return log_error_errno(r, "Could not append NDA_DST attribute: %m");
e4a71bf3 WKI	143
	144	r = netlink_call_async(link->manager->rtnl, NULL, req, callback ?: neighbor_handler,
	145	link_netlink_destroy_callback, link);
	146	if (r < 0)
	147	return log_error_errno(r, "Could not send rtnetlink message: %m");
	148
	149	link->neighbor_messages++;
	150	link_ref(link);
	151
	152	return 0;
	153	}
	154
	155	int config_parse_neighbor_address(const char *unit,
	156	const char *filename,
	157	unsigned line,
	158	const char *section,
	159	unsigned section_line,
	160	const char *lvalue,
	161	int ltype,
	162	const char *rvalue,
	163	void *data,
	164	void *userdata) {
	165
	166	Network *network = userdata;
fcbf4cb7	167	_cleanup_(neighbor_free_or_set_invalidp) Neighbor *n = NULL;
e4a71bf3 WKI	168	int r;
	169
	170	assert(filename);
	171	assert(section);
	172	assert(lvalue);
	173	assert(rvalue);
	174	assert(data);
	175
	176	r = neighbor_new_static(network, filename, section_line, &n);
	177	if (r < 0)
	178	return r;
	179
	180	r = in_addr_from_string_auto(rvalue, &n->family, &n->in_addr);
	181	if (r < 0) {
	182	log_syntax(unit, LOG_ERR, filename, line, r, "Neighbor Address is invalid, ignoring assignment: %s", rvalue);
	183	return 0;
	184	}
	185
	186	TAKE_PTR(n);
	187
	188	return 0;
	189	}
	190
	191	int config_parse_neighbor_hwaddr(const char *unit,
	192	const char *filename,
	193	unsigned line,
	194	const char *section,
	195	unsigned section_line,
	196	const char *lvalue,
	197	int ltype,
	198	const char *rvalue,
	199	void *data,
	200	void *userdata) {
	201
	202	Network *network = userdata;
fcbf4cb7	203	_cleanup_(neighbor_free_or_set_invalidp) Neighbor *n = NULL;
e4a71bf3 WKI	204	int r;
	205
	206	assert(filename);
	207	assert(section);
	208	assert(lvalue);
	209	assert(rvalue);
	210	assert(data);
	211
	212	r = neighbor_new_static(network, filename, section_line, &n);
	213	if (r < 0)
	214	return r;
	215
	216	r = ether_addr_from_string(rvalue, &n->mac);
	217	if (r < 0) {
	218	log_syntax(unit, LOG_ERR, filename, line, r, "Neighbor MACAddress is invalid, ignoring assignment: %s", rvalue);
	219	return 0;
	220	}
	221
	222	n->mac_configured = true;
	223	TAKE_PTR(n);
	224
	225	return 0;
	226	}