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

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

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

#include "conf-parser.h"
#include "util.h"
#include "netlink-util.h"

#include "networkd.h"
#include "networkd-fdb.h"

/* create a new FDB entry or get an existing one. */
int fdb_entry_new_static(Network *const network,
                         const unsigned section,
                         FdbEntry **ret) {
        _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
        struct ether_addr *mac_addr = NULL;

        assert(network);

        /* 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;
                }
        }

        /* 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);

        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 *const link, FdbEntry *const fdb_entry) {
        _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL;
        sd_netlink *rtnl;
        int r;

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

        rtnl = link->manager->rtnl;

        /* 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);

        /* only NTF_SELF flag supported. */
        r = sd_rtnl_message_neigh_set_flags(req, NTF_SELF);
        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);

                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_unsigned(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
e735f4d4 MP	1	/-- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil --/
	2
	3	/***
	4	This file is part of systemd.
	5
	6	Copyright (C) 2014 Intel Corporation. All rights reserved.
	7
	8	systemd is free software; you can redistribute it and/or modify it
	9	under the terms of the GNU Lesser General Public License as published by
	10	the Free Software Foundation; either version 2.1 of the License, or
	11	(at your option) any later version.
	12
	13	systemd is distributed in the hope that it will be useful, but
	14	WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	Lesser General Public License for more details.
	17
	18	You should have received a copy of the GNU Lesser General Public License
	19	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	20	***/
	21
e735f4d4 MP	22	#include <net/if.h>
	23	#include <net/ethernet.h>
	24
e735f4d4 MP	25	#include "conf-parser.h"
e735f4d4 MP	26	#include "util.h"
d9dfd233 MP	27	#include "netlink-util.h"
	28
	29	#include "networkd.h"
	30	#include "networkd-fdb.h"
e735f4d4 MP	31
	32	/* create a new FDB entry or get an existing one. */
	33	int fdb_entry_new_static(Network *const network,
	34	const unsigned section,
	35	FdbEntry **ret) {
	36	_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
	37	struct ether_addr *mac_addr = NULL;
	38
	39	assert(network);
	40
	41	/* search entry in hashmap first. */
	42	if(section) {
	43	fdb_entry = hashmap_get(network->fdb_entries_by_section, UINT_TO_PTR(section));
	44	if (fdb_entry) {
	45	*ret = fdb_entry;
	46	fdb_entry = NULL;
	47
	48	return 0;
	49	}
	50	}
	51
	52	/* allocate space for MAC address. */
	53	mac_addr = new0(struct ether_addr, 1);
	54	if (!mac_addr)
	55	return -ENOMEM;
	56
	57	/* allocate space for and FDB entry. */
	58	fdb_entry = new0(FdbEntry, 1);
	59
	60	if (!fdb_entry) {
	61	/* free previously allocated space for mac_addr. */
	62	free(mac_addr);
	63	return -ENOMEM;
	64	}
	65
	66	/* init FDB structure. */
	67	fdb_entry->network = network;
	68	fdb_entry->mac_addr = mac_addr;
	69
	70	LIST_PREPEND(static_fdb_entries, network->static_fdb_entries, fdb_entry);
	71
	72	if (section) {
	73	fdb_entry->section = section;
	74	hashmap_put(network->fdb_entries_by_section,
	75	UINT_TO_PTR(fdb_entry->section), fdb_entry);
	76	}
	77
	78	/* return allocated FDB structure. */
	79	*ret = fdb_entry;
	80	fdb_entry = NULL;
	81
	82	return 0;
	83	}
	84
86f210e9	85	static int set_fdb_handler(sd_netlink rtnl, sd_netlink_message m, void *userdata) {
e735f4d4 MP	86	Link *link = userdata;
	87	int r;
	88
	89	assert(link);
	90
86f210e9	91	r = sd_netlink_message_get_errno(m);
e735f4d4	92	if (r < 0 && r != -EEXIST)
e3bff60a	93	log_link_error_errno(link, r, "Could not add FDB entry: %m");
e735f4d4 MP	94
	95	return 1;
	96	}
	97
	98	/* send a request to the kernel to add a FDB entry in its static MAC table. */
	99	int fdb_entry_configure(Link const link, FdbEntry const fdb_entry) {
86f210e9 MP	100	_cleanup_netlink_message_unref_ sd_netlink_message *req = NULL;
86f210e9 MP	101	sd_netlink *rtnl;
e735f4d4 MP	102	int r;
	103
	104	assert(link);
	105	assert(link->manager);
	106	assert(fdb_entry);
	107
	108	rtnl = link->manager->rtnl;
	109
	110	/* create new RTM message */
	111	r = sd_rtnl_message_new_neigh(rtnl, &req, RTM_NEWNEIGH, link->ifindex, PF_BRIDGE);
	112	if (r < 0)
	113	return rtnl_log_create_error(r);
	114
	115	/* only NTF_SELF flag supported. */
	116	r = sd_rtnl_message_neigh_set_flags(req, NTF_SELF);
	117	if (r < 0)
	118	return rtnl_log_create_error(r);
	119
	120	/* only NUD_PERMANENT state supported. */
	121	r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP \| NUD_PERMANENT);
	122	if (r < 0)
	123	return rtnl_log_create_error(r);
	124
86f210e9	125	r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, fdb_entry->mac_addr);
e735f4d4 MP	126	if (r < 0)
	127	return rtnl_log_create_error(r);
	128
	129	/* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
	130	if (0 != fdb_entry->vlan_id) {
86f210e9	131	r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id);
e735f4d4 MP	132	if (r < 0)
	133	return rtnl_log_create_error(r);
	134	}
	135
	136	/* send message to the kernel to update its internal static MAC table. */
86f210e9	137	r = sd_netlink_call_async(rtnl, req, set_fdb_handler, link, 0, NULL);
e3bff60a MP	138	if (r < 0)
e3bff60a MP	139	return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
e735f4d4 MP	140
	141	return 0;
	142	}
	143
	144	/* remove and FDB entry. */
	145	void fdb_entry_free(FdbEntry *fdb_entry) {
	146	if(!fdb_entry)
	147	return;
	148
	149	if(fdb_entry->network) {
	150	LIST_REMOVE(static_fdb_entries, fdb_entry->network->static_fdb_entries,
	151	fdb_entry);
	152
e3bff60a MP	153	if (fdb_entry->section)
	154	hashmap_remove(fdb_entry->network->fdb_entries_by_section,
	155	UINT_TO_PTR(fdb_entry->section));
e735f4d4 MP	156	}
	157
	158	free(fdb_entry->mac_addr);
	159
	160	free(fdb_entry);
	161	}
	162
	163	/* parse the HW address from config files. */
e3bff60a MP	164	int config_parse_fdb_hwaddr(
	165	const char *unit,
	166	const char *filename,
	167	unsigned line,
	168	const char *section,
	169	unsigned section_line,
	170	const char *lvalue,
	171	int ltype,
	172	const char *rvalue,
	173	void *data,
	174	void *userdata) {
	175
e735f4d4 MP	176	Network *network = userdata;
	177	_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
	178	int r;
	179
	180	assert(filename);
	181	assert(section);
	182	assert(lvalue);
	183	assert(rvalue);
	184	assert(data);
	185
	186	r = fdb_entry_new_static(network, section_line, &fdb_entry);
e3bff60a MP	187	if (r < 0)
e3bff60a MP	188	return log_oom();
e735f4d4 MP	189
	190	/* read in the MAC address for the FDB table. */
	191	r = sscanf(rvalue, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
	192	&fdb_entry->mac_addr->ether_addr_octet[0],
	193	&fdb_entry->mac_addr->ether_addr_octet[1],
	194	&fdb_entry->mac_addr->ether_addr_octet[2],
	195	&fdb_entry->mac_addr->ether_addr_octet[3],
	196	&fdb_entry->mac_addr->ether_addr_octet[4],
	197	&fdb_entry->mac_addr->ether_addr_octet[5]);
	198
e3bff60a	199	if (ETHER_ADDR_LEN != r) {
6300502b	200	log_syntax(unit, LOG_ERR, filename, line, 0, "Not a valid MAC address, ignoring assignment: %s", rvalue);
e735f4d4 MP	201	return 0;
	202	}
	203
	204	fdb_entry = NULL;
	205
	206	return 0;
	207	}
	208
	209	/* parse the VLAN Id from config files. */
e3bff60a MP	210	int config_parse_fdb_vlan_id(
	211	const char *unit,
	212	const char *filename,
	213	unsigned line,
	214	const char *section,
	215	unsigned section_line,
	216	const char *lvalue,
	217	int ltype,
	218	const char *rvalue,
	219	void *data,
	220	void *userdata) {
	221
e735f4d4 MP	222	Network *network = userdata;
	223	_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
	224	int r;
	225
	226	assert(filename);
	227	assert(section);
	228	assert(lvalue);
	229	assert(rvalue);
	230	assert(data);
	231
	232	r = fdb_entry_new_static(network, section_line, &fdb_entry);
e3bff60a MP	233	if (r < 0)
e3bff60a MP	234	return log_oom();
e735f4d4 MP	235
	236	r = config_parse_unsigned(unit, filename, line, section,
	237	section_line, lvalue, ltype,
	238	rvalue, &fdb_entry->vlan_id, userdata);
e3bff60a	239	if (r < 0)
e735f4d4	240	return r;
e735f4d4 MP	241
	242	fdb_entry = NULL;
	243
	244	return 0;
	245	}