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

/* SPDX-License-Identifier: LGPL-2.1+ */
/***
  This file is part of systemd.

  Copyright (C) 2014 Intel Corporation. All rights reserved.
***/

#include <net/ethernet.h>
#include <net/if.h>

#include "alloc-util.h"
#include "conf-parser.h"
#include "netdev/bridge.h"
#include "netlink-util.h"
#include "networkd-fdb.h"
#include "networkd-manager.h"
#include "util.h"
#include "vlan-util.h"

#define STATIC_FDB_ENTRIES_PER_NETWORK_MAX 1024U

/* create a new FDB entry or get an existing one. */
int fdb_entry_new_static(
                Network *network,
                unsigned section,
                FdbEntry **ret) {

        _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
        struct ether_addr *mac_addr = NULL;

        assert(network);
        assert(ret);

        /* search entry in hashmap first. */
        if (section) {
                fdb_entry = hashmap_get(network->fdb_entries_by_section, UINT_TO_PTR(section));
                if (fdb_entry) {
                        *ret = TAKE_PTR(fdb_entry);

                        return 0;
                }
        }

        if (network->n_static_fdb_entries >= STATIC_FDB_ENTRIES_PER_NETWORK_MAX)
                return -E2BIG;

        /* allocate space for MAC address. */
        mac_addr = new0(struct ether_addr, 1);
        if (!mac_addr)
                return -ENOMEM;

        /* allocate space for and FDB entry. */
        fdb_entry = new0(FdbEntry, 1);
        if (!fdb_entry) {
                /* free previously allocated space for mac_addr. */
                free(mac_addr);
                return -ENOMEM;
        }

        /* init FDB structure. */
        fdb_entry->network = network;
        fdb_entry->mac_addr = mac_addr;

        LIST_PREPEND(static_fdb_entries, network->static_fdb_entries, fdb_entry);
        network->n_static_fdb_entries++;

        if (section) {
                fdb_entry->section = section;
                hashmap_put(network->fdb_entries_by_section,
                            UINT_TO_PTR(fdb_entry->section), fdb_entry);
        }

        /* return allocated FDB structure. */
        *ret = TAKE_PTR(fdb_entry);

        return 0;
}

static int set_fdb_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
        Link *link = userdata;
        int r;

        assert(link);

        r = sd_netlink_message_get_errno(m);
        if (r < 0 && r != -EEXIST)
                log_link_error_errno(link, r, "Could not add FDB entry: %m");

        return 1;
}

/* send a request to the kernel to add a FDB entry in its static MAC table. */
int fdb_entry_configure(Link *link, FdbEntry *fdb_entry) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
        sd_netlink *rtnl;
        int r;
        uint8_t flags;
        Bridge *bridge;

        assert(link);
        assert(link->network);
        assert(link->manager);
        assert(fdb_entry);

        rtnl = link->manager->rtnl;
        bridge = BRIDGE(link->network->bridge);

        /* create new RTM message */
        r = sd_rtnl_message_new_neigh(rtnl, &req, RTM_NEWNEIGH, link->ifindex, PF_BRIDGE);
        if (r < 0)
                return rtnl_log_create_error(r);

        if (bridge)
                flags = NTF_MASTER;
        else
                flags = NTF_SELF;

        r = sd_rtnl_message_neigh_set_flags(req, flags);
        if (r < 0)
                return rtnl_log_create_error(r);

        /* only NUD_PERMANENT state supported. */
        r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP | NUD_PERMANENT);
        if (r < 0)
                return rtnl_log_create_error(r);

        r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, fdb_entry->mac_addr);
        if (r < 0)
                return rtnl_log_create_error(r);

        /* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
        if (0 != fdb_entry->vlan_id) {
                r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id);
                if (r < 0)
                        return rtnl_log_create_error(r);
        }

        /* send message to the kernel to update its internal static MAC table. */
        r = sd_netlink_call_async(rtnl, req, set_fdb_handler, link, 0, NULL);
        if (r < 0)
                return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");

        return 0;
}

/* remove and FDB entry. */
void fdb_entry_free(FdbEntry *fdb_entry) {
        if (!fdb_entry)
                return;

        if (fdb_entry->network) {
                LIST_REMOVE(static_fdb_entries, fdb_entry->network->static_fdb_entries, fdb_entry);

                assert(fdb_entry->network->n_static_fdb_entries > 0);
                fdb_entry->network->n_static_fdb_entries--;

                if (fdb_entry->section)
                        hashmap_remove(fdb_entry->network->fdb_entries_by_section, UINT_TO_PTR(fdb_entry->section));
        }

        free(fdb_entry->mac_addr);

        free(fdb_entry);
}

/* parse the HW address from config files. */
int config_parse_fdb_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_fdbentry_free_ FdbEntry *fdb_entry = NULL;
        int r;

        assert(filename);
        assert(section);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        r = fdb_entry_new_static(network, section_line, &fdb_entry);
        if (r < 0)
                return log_oom();

        /* read in the MAC address for the FDB table. */
        r = sscanf(rvalue, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
                   &fdb_entry->mac_addr->ether_addr_octet[0],
                   &fdb_entry->mac_addr->ether_addr_octet[1],
                   &fdb_entry->mac_addr->ether_addr_octet[2],
                   &fdb_entry->mac_addr->ether_addr_octet[3],
                   &fdb_entry->mac_addr->ether_addr_octet[4],
                   &fdb_entry->mac_addr->ether_addr_octet[5]);

        if (ETHER_ADDR_LEN != r) {
                log_syntax(unit, LOG_ERR, filename, line, 0, "Not a valid MAC address, ignoring assignment: %s", rvalue);
                return 0;
        }

        fdb_entry = NULL;

        return 0;
}

/* parse the VLAN Id from config files. */
int config_parse_fdb_vlan_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) {

        Network *network = userdata;
        _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
        int r;

        assert(filename);
        assert(section);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        r = fdb_entry_new_static(network, section_line, &fdb_entry);
        if (r < 0)
                return log_oom();

        r = config_parse_vlanid(unit, filename, line, section,
                                section_line, lvalue, ltype,
                                rvalue, &fdb_entry->vlan_id, userdata);
        if (r < 0)
                return r;

        fdb_entry = NULL;

        return 0;
}
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
b98b483b AR	2	/***
	3	This file is part of systemd.
	4
	5	Copyright (C) 2014 Intel Corporation. All rights reserved.
b98b483b AR	6	***/
b98b483b AR	7
b98b483b	8	#include <net/ethernet.h>
cf0fbc49	9	#include <net/if.h>
b98b483b	10
b5efdb8a	11	#include "alloc-util.h"
b98b483b	12	#include "conf-parser.h"
23f53b99	13	#include "netdev/bridge.h"
fc2f9534	14	#include "netlink-util.h"
fc2f9534	15	#include "networkd-fdb.h"
23f53b99	16	#include "networkd-manager.h"
b5efdb8a	17	#include "util.h"
0e83e7a5	18	#include "vlan-util.h"
b98b483b	19
8c34b963 LP	20	#define STATIC_FDB_ENTRIES_PER_NETWORK_MAX 1024U
8c34b963 LP	21
b98b483b	22	/* create a new FDB entry or get an existing one. */
8c34b963 LP	23	int fdb_entry_new_static(
8c34b963 LP	24	Network *network,
a60a720c	25	unsigned section,
8c34b963 LP	26	FdbEntry **ret) {
8c34b963 LP	27
b98b483b AR	28	_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
	29	struct ether_addr *mac_addr = NULL;
	30
	31	assert(network);
8c34b963	32	assert(ret);
b98b483b AR	33
b98b483b AR	34	/* search entry in hashmap first. */
9ed794a3	35	if (section) {
b98b483b AR	36	fdb_entry = hashmap_get(network->fdb_entries_by_section, UINT_TO_PTR(section));
b98b483b AR	37	if (fdb_entry) {
1cc6c93a	38	*ret = TAKE_PTR(fdb_entry);
b98b483b AR	39
	40	return 0;
	41	}
	42	}
	43
8c34b963 LP	44	if (network->n_static_fdb_entries >= STATIC_FDB_ENTRIES_PER_NETWORK_MAX)
	45	return -E2BIG;
	46
b98b483b AR	47	/* allocate space for MAC address. */
	48	mac_addr = new0(struct ether_addr, 1);
	49	if (!mac_addr)
	50	return -ENOMEM;
	51
	52	/* allocate space for and FDB entry. */
	53	fdb_entry = new0(FdbEntry, 1);
b98b483b AR	54	if (!fdb_entry) {
	55	/* free previously allocated space for mac_addr. */
	56	free(mac_addr);
	57	return -ENOMEM;
	58	}
	59
	60	/* init FDB structure. */
	61	fdb_entry->network = network;
	62	fdb_entry->mac_addr = mac_addr;
	63
	64	LIST_PREPEND(static_fdb_entries, network->static_fdb_entries, fdb_entry);
8c34b963	65	network->n_static_fdb_entries++;
b98b483b AR	66
	67	if (section) {
	68	fdb_entry->section = section;
	69	hashmap_put(network->fdb_entries_by_section,
	70	UINT_TO_PTR(fdb_entry->section), fdb_entry);
	71	}
	72
	73	/* return allocated FDB structure. */
1cc6c93a	74	*ret = TAKE_PTR(fdb_entry);
b98b483b AR	75
	76	return 0;
	77	}
	78
1c4baffc	79	static int set_fdb_handler(sd_netlink rtnl, sd_netlink_message m, void *userdata) {
ea6ec096	80	Link *link = userdata;
b98b483b AR	81	int r;
b98b483b AR	82
ea6ec096	83	assert(link);
b98b483b	84
1c4baffc	85	r = sd_netlink_message_get_errno(m);
ea6ec096	86	if (r < 0 && r != -EEXIST)
6a7a4e4d	87	log_link_error_errno(link, r, "Could not add FDB entry: %m");
b98b483b AR	88
	89	return 1;
	90	}
	91
	92	/* send a request to the kernel to add a FDB entry in its static MAC table. */
a60a720c	93	int fdb_entry_configure(Link link, FdbEntry fdb_entry) {
4afd3348	94	_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1c4baffc	95	sd_netlink *rtnl;
b98b483b	96	int r;
f6bb7ac5 TJ	97	uint8_t flags;
f6bb7ac5 TJ	98	Bridge *bridge;
b98b483b	99
ea6ec096	100	assert(link);
f6bb7ac5	101	assert(link->network);
ea6ec096	102	assert(link->manager);
b98b483b	103	assert(fdb_entry);
ea6ec096 TG	104
ea6ec096 TG	105	rtnl = link->manager->rtnl;
f6bb7ac5	106	bridge = BRIDGE(link->network->bridge);
b98b483b AR	107
b98b483b AR	108	/* create new RTM message */
ea6ec096	109	r = sd_rtnl_message_new_neigh(rtnl, &req, RTM_NEWNEIGH, link->ifindex, PF_BRIDGE);
b98b483b AR	110	if (r < 0)
	111	return rtnl_log_create_error(r);
	112
f6bb7ac5 TJ	113	if (bridge)
	114	flags = NTF_MASTER;
	115	else
	116	flags = NTF_SELF;
	117
	118	r = sd_rtnl_message_neigh_set_flags(req, flags);
b98b483b AR	119	if (r < 0)
	120	return rtnl_log_create_error(r);
	121
	122	/* only NUD_PERMANENT state supported. */
	123	r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP \| NUD_PERMANENT);
	124	if (r < 0)
	125	return rtnl_log_create_error(r);
	126
1c4baffc	127	r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, fdb_entry->mac_addr);
b98b483b AR	128	if (r < 0)
	129	return rtnl_log_create_error(r);
	130
	131	/* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
	132	if (0 != fdb_entry->vlan_id) {
1c4baffc	133	r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id);
b98b483b AR	134	if (r < 0)
	135	return rtnl_log_create_error(r);
	136	}
	137
	138	/* send message to the kernel to update its internal static MAC table. */
1c4baffc	139	r = sd_netlink_call_async(rtnl, req, set_fdb_handler, link, 0, NULL);
6a7a4e4d LP	140	if (r < 0)
6a7a4e4d LP	141	return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
b98b483b AR	142
	143	return 0;
	144	}
	145
	146	/* remove and FDB entry. */
	147	void fdb_entry_free(FdbEntry *fdb_entry) {
9ed794a3	148	if (!fdb_entry)
b98b483b AR	149	return;
b98b483b AR	150
9ed794a3	151	if (fdb_entry->network) {
8c34b963 LP	152	LIST_REMOVE(static_fdb_entries, fdb_entry->network->static_fdb_entries, fdb_entry);
	153
	154	assert(fdb_entry->network->n_static_fdb_entries > 0);
	155	fdb_entry->network->n_static_fdb_entries--;
b98b483b	156
8519d8f5	157	if (fdb_entry->section)
8c34b963	158	hashmap_remove(fdb_entry->network->fdb_entries_by_section, UINT_TO_PTR(fdb_entry->section));
b98b483b AR	159	}
	160
	161	free(fdb_entry->mac_addr);
	162
	163	free(fdb_entry);
	164	}
	165
	166	/* parse the HW address from config files. */
8519d8f5 LP	167	int config_parse_fdb_hwaddr(
	168	const char *unit,
	169	const char *filename,
	170	unsigned line,
	171	const char *section,
	172	unsigned section_line,
	173	const char *lvalue,
	174	int ltype,
	175	const char *rvalue,
	176	void *data,
	177	void *userdata) {
	178
b98b483b AR	179	Network *network = userdata;
	180	_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
	181	int r;
	182
	183	assert(filename);
	184	assert(section);
	185	assert(lvalue);
	186	assert(rvalue);
	187	assert(data);
	188
	189	r = fdb_entry_new_static(network, section_line, &fdb_entry);
6a7a4e4d LP	190	if (r < 0)
6a7a4e4d LP	191	return log_oom();
b98b483b AR	192
	193	/* read in the MAC address for the FDB table. */
	194	r = sscanf(rvalue, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
	195	&fdb_entry->mac_addr->ether_addr_octet[0],
	196	&fdb_entry->mac_addr->ether_addr_octet[1],
	197	&fdb_entry->mac_addr->ether_addr_octet[2],
	198	&fdb_entry->mac_addr->ether_addr_octet[3],
	199	&fdb_entry->mac_addr->ether_addr_octet[4],
	200	&fdb_entry->mac_addr->ether_addr_octet[5]);
	201
8519d8f5	202	if (ETHER_ADDR_LEN != r) {
12ca818f	203	log_syntax(unit, LOG_ERR, filename, line, 0, "Not a valid MAC address, ignoring assignment: %s", rvalue);
b98b483b AR	204	return 0;
	205	}
	206
	207	fdb_entry = NULL;
	208
	209	return 0;
	210	}
	211
	212	/* parse the VLAN Id from config files. */
8519d8f5 LP	213	int config_parse_fdb_vlan_id(
	214	const char *unit,
	215	const char *filename,
	216	unsigned line,
	217	const char *section,
	218	unsigned section_line,
	219	const char *lvalue,
	220	int ltype,
	221	const char *rvalue,
	222	void *data,
	223	void *userdata) {
	224
b98b483b AR	225	Network *network = userdata;
	226	_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
	227	int r;
	228
	229	assert(filename);
	230	assert(section);
	231	assert(lvalue);
	232	assert(rvalue);
	233	assert(data);
	234
	235	r = fdb_entry_new_static(network, section_line, &fdb_entry);
6a7a4e4d LP	236	if (r < 0)
6a7a4e4d LP	237	return log_oom();
b98b483b	238
0e83e7a5 TJ	239	r = config_parse_vlanid(unit, filename, line, section,
	240	section_line, lvalue, ltype,
	241	rvalue, &fdb_entry->vlan_id, userdata);
6a7a4e4d	242	if (r < 0)
b98b483b	243	return r;
b98b483b AR	244
	245	fdb_entry = NULL;
	246
	247	return 0;
	248	}