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

/***
  This file is part of systemd.

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

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

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

#include "alloc-util.h"
#include "conf-parser.h"
#include "netlink-util.h"
#include "networkd-fdb.h"
#include "networkd.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 = fdb_entry;
                        fdb_entry = NULL;

                        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 = fdb_entry;
        fdb_entry = NULL;

        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
b98b483b AR	1	/***
	2	This file is part of systemd.
	3
	4	Copyright (C) 2014 Intel Corporation. All rights reserved.
	5
	6	systemd is free software; you can redistribute it and/or modify it
	7	under the terms of the GNU Lesser General Public License as published by
	8	the Free Software Foundation; either version 2.1 of the License, or
	9	(at your option) any later version.
	10
	11	systemd is distributed in the hope that it will be useful, but
	12	WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	Lesser General Public License for more details.
	15
	16	You should have received a copy of the GNU Lesser General Public License
	17	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	18	***/
	19
b98b483b	20	#include <net/ethernet.h>
cf0fbc49	21	#include <net/if.h>
b98b483b	22
b5efdb8a	23	#include "alloc-util.h"
b98b483b	24	#include "conf-parser.h"
fc2f9534	25	#include "netlink-util.h"
fc2f9534	26	#include "networkd-fdb.h"
b5efdb8a LP	27	#include "networkd.h"
b5efdb8a LP	28	#include "util.h"
0e83e7a5	29	#include "vlan-util.h"
b98b483b	30
8c34b963 LP	31	#define STATIC_FDB_ENTRIES_PER_NETWORK_MAX 1024U
8c34b963 LP	32
b98b483b	33	/* create a new FDB entry or get an existing one. */
8c34b963 LP	34	int fdb_entry_new_static(
8c34b963 LP	35	Network *network,
a60a720c	36	unsigned section,
8c34b963 LP	37	FdbEntry **ret) {
8c34b963 LP	38
b98b483b AR	39	_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
	40	struct ether_addr *mac_addr = NULL;
	41
	42	assert(network);
8c34b963	43	assert(ret);
b98b483b AR	44
b98b483b AR	45	/* search entry in hashmap first. */
9ed794a3	46	if (section) {
b98b483b AR	47	fdb_entry = hashmap_get(network->fdb_entries_by_section, UINT_TO_PTR(section));
	48	if (fdb_entry) {
	49	*ret = fdb_entry;
	50	fdb_entry = NULL;
	51
	52	return 0;
	53	}
	54	}
	55
8c34b963 LP	56	if (network->n_static_fdb_entries >= STATIC_FDB_ENTRIES_PER_NETWORK_MAX)
	57	return -E2BIG;
	58
b98b483b AR	59	/* allocate space for MAC address. */
	60	mac_addr = new0(struct ether_addr, 1);
	61	if (!mac_addr)
	62	return -ENOMEM;
	63
	64	/* allocate space for and FDB entry. */
	65	fdb_entry = new0(FdbEntry, 1);
b98b483b AR	66	if (!fdb_entry) {
	67	/* free previously allocated space for mac_addr. */
	68	free(mac_addr);
	69	return -ENOMEM;
	70	}
	71
	72	/* init FDB structure. */
	73	fdb_entry->network = network;
	74	fdb_entry->mac_addr = mac_addr;
	75
	76	LIST_PREPEND(static_fdb_entries, network->static_fdb_entries, fdb_entry);
8c34b963	77	network->n_static_fdb_entries++;
b98b483b AR	78
	79	if (section) {
	80	fdb_entry->section = section;
	81	hashmap_put(network->fdb_entries_by_section,
	82	UINT_TO_PTR(fdb_entry->section), fdb_entry);
	83	}
	84
	85	/* return allocated FDB structure. */
	86	*ret = fdb_entry;
	87	fdb_entry = NULL;
	88
	89	return 0;
	90	}
	91
1c4baffc	92	static int set_fdb_handler(sd_netlink rtnl, sd_netlink_message m, void *userdata) {
ea6ec096	93	Link *link = userdata;
b98b483b AR	94	int r;
b98b483b AR	95
ea6ec096	96	assert(link);
b98b483b	97
1c4baffc	98	r = sd_netlink_message_get_errno(m);
ea6ec096	99	if (r < 0 && r != -EEXIST)
6a7a4e4d	100	log_link_error_errno(link, r, "Could not add FDB entry: %m");
b98b483b AR	101
	102	return 1;
	103	}
	104
	105	/* send a request to the kernel to add a FDB entry in its static MAC table. */
a60a720c	106	int fdb_entry_configure(Link link, FdbEntry fdb_entry) {
4afd3348	107	_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1c4baffc	108	sd_netlink *rtnl;
b98b483b	109	int r;
f6bb7ac5 TJ	110	uint8_t flags;
f6bb7ac5 TJ	111	Bridge *bridge;
b98b483b	112
ea6ec096	113	assert(link);
f6bb7ac5	114	assert(link->network);
ea6ec096	115	assert(link->manager);
b98b483b	116	assert(fdb_entry);
ea6ec096 TG	117
ea6ec096 TG	118	rtnl = link->manager->rtnl;
f6bb7ac5	119	bridge = BRIDGE(link->network->bridge);
b98b483b AR	120
b98b483b AR	121	/* create new RTM message */
ea6ec096	122	r = sd_rtnl_message_new_neigh(rtnl, &req, RTM_NEWNEIGH, link->ifindex, PF_BRIDGE);
b98b483b AR	123	if (r < 0)
	124	return rtnl_log_create_error(r);
	125
f6bb7ac5 TJ	126	if (bridge)
	127	flags = NTF_MASTER;
	128	else
	129	flags = NTF_SELF;
	130
	131	r = sd_rtnl_message_neigh_set_flags(req, flags);
b98b483b AR	132	if (r < 0)
	133	return rtnl_log_create_error(r);
	134
	135	/* only NUD_PERMANENT state supported. */
	136	r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP \| NUD_PERMANENT);
	137	if (r < 0)
	138	return rtnl_log_create_error(r);
	139
1c4baffc	140	r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, fdb_entry->mac_addr);
b98b483b AR	141	if (r < 0)
	142	return rtnl_log_create_error(r);
	143
	144	/* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
	145	if (0 != fdb_entry->vlan_id) {
1c4baffc	146	r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id);
b98b483b AR	147	if (r < 0)
	148	return rtnl_log_create_error(r);
	149	}
	150
	151	/* send message to the kernel to update its internal static MAC table. */
1c4baffc	152	r = sd_netlink_call_async(rtnl, req, set_fdb_handler, link, 0, NULL);
6a7a4e4d LP	153	if (r < 0)
6a7a4e4d LP	154	return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
b98b483b AR	155
	156	return 0;
	157	}
	158
	159	/* remove and FDB entry. */
	160	void fdb_entry_free(FdbEntry *fdb_entry) {
9ed794a3	161	if (!fdb_entry)
b98b483b AR	162	return;
b98b483b AR	163
9ed794a3	164	if (fdb_entry->network) {
8c34b963 LP	165	LIST_REMOVE(static_fdb_entries, fdb_entry->network->static_fdb_entries, fdb_entry);
	166
	167	assert(fdb_entry->network->n_static_fdb_entries > 0);
	168	fdb_entry->network->n_static_fdb_entries--;
b98b483b	169
8519d8f5	170	if (fdb_entry->section)
8c34b963	171	hashmap_remove(fdb_entry->network->fdb_entries_by_section, UINT_TO_PTR(fdb_entry->section));
b98b483b AR	172	}
	173
	174	free(fdb_entry->mac_addr);
	175
	176	free(fdb_entry);
	177	}
	178
	179	/* parse the HW address from config files. */
8519d8f5 LP	180	int config_parse_fdb_hwaddr(
	181	const char *unit,
	182	const char *filename,
	183	unsigned line,
	184	const char *section,
	185	unsigned section_line,
	186	const char *lvalue,
	187	int ltype,
	188	const char *rvalue,
	189	void *data,
	190	void *userdata) {
	191
b98b483b AR	192	Network *network = userdata;
	193	_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
	194	int r;
	195
	196	assert(filename);
	197	assert(section);
	198	assert(lvalue);
	199	assert(rvalue);
	200	assert(data);
	201
	202	r = fdb_entry_new_static(network, section_line, &fdb_entry);
6a7a4e4d LP	203	if (r < 0)
6a7a4e4d LP	204	return log_oom();
b98b483b AR	205
	206	/* read in the MAC address for the FDB table. */
	207	r = sscanf(rvalue, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
	208	&fdb_entry->mac_addr->ether_addr_octet[0],
	209	&fdb_entry->mac_addr->ether_addr_octet[1],
	210	&fdb_entry->mac_addr->ether_addr_octet[2],
	211	&fdb_entry->mac_addr->ether_addr_octet[3],
	212	&fdb_entry->mac_addr->ether_addr_octet[4],
	213	&fdb_entry->mac_addr->ether_addr_octet[5]);
	214
8519d8f5	215	if (ETHER_ADDR_LEN != r) {
12ca818f	216	log_syntax(unit, LOG_ERR, filename, line, 0, "Not a valid MAC address, ignoring assignment: %s", rvalue);
b98b483b AR	217	return 0;
	218	}
	219
	220	fdb_entry = NULL;
	221
	222	return 0;
	223	}
	224
	225	/* parse the VLAN Id from config files. */
8519d8f5 LP	226	int config_parse_fdb_vlan_id(
	227	const char *unit,
	228	const char *filename,
	229	unsigned line,
	230	const char *section,
	231	unsigned section_line,
	232	const char *lvalue,
	233	int ltype,
	234	const char *rvalue,
	235	void *data,
	236	void *userdata) {
	237
b98b483b AR	238	Network *network = userdata;
	239	_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
	240	int r;
	241
	242	assert(filename);
	243	assert(section);
	244	assert(lvalue);
	245	assert(rvalue);
	246	assert(data);
	247
	248	r = fdb_entry_new_static(network, section_line, &fdb_entry);
6a7a4e4d LP	249	if (r < 0)
6a7a4e4d LP	250	return log_oom();
b98b483b	251
0e83e7a5 TJ	252	r = config_parse_vlanid(unit, filename, line, section,
	253	section_line, lvalue, ltype,
	254	rvalue, &fdb_entry->vlan_id, userdata);
6a7a4e4d	255	if (r < 0)
b98b483b	256	return r;
b98b483b AR	257
	258	fdb_entry = NULL;
	259
	260	return 0;
	261	}