[thirdparty/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 "networkd.h"
#include "networkd-link.h"
#include "conf-parser.h"
#include "util.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_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
        Link *link = userdata;
        int r;

        assert(link);

        r = sd_rtnl_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_rtnl_message_unref_ sd_rtnl_message *req = NULL;
        sd_rtnl *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_rtnl_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_rtnl_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_rtnl_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, EINVAL,
                           "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
b98b483b AR	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
b98b483b AR	22	#include <net/if.h>
	23	#include <net/ethernet.h>
	24
	25	#include "networkd.h"
b98b483b	26	#include "networkd-link.h"
b98b483b AR	27	#include "conf-parser.h"
	28	#include "util.h"
	29
	30	/* create a new FDB entry or get an existing one. */
	31	int fdb_entry_new_static(Network *const network,
	32	const unsigned section,
	33	FdbEntry **ret) {
	34	_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
	35	struct ether_addr *mac_addr = NULL;
	36
	37	assert(network);
	38
	39	/* search entry in hashmap first. */
	40	if(section) {
	41	fdb_entry = hashmap_get(network->fdb_entries_by_section, UINT_TO_PTR(section));
	42	if (fdb_entry) {
	43	*ret = fdb_entry;
	44	fdb_entry = NULL;
	45
	46	return 0;
	47	}
	48	}
	49
	50	/* allocate space for MAC address. */
	51	mac_addr = new0(struct ether_addr, 1);
	52	if (!mac_addr)
	53	return -ENOMEM;
	54
	55	/* allocate space for and FDB entry. */
	56	fdb_entry = new0(FdbEntry, 1);
	57
	58	if (!fdb_entry) {
	59	/* free previously allocated space for mac_addr. */
	60	free(mac_addr);
	61	return -ENOMEM;
	62	}
	63
	64	/* init FDB structure. */
	65	fdb_entry->network = network;
	66	fdb_entry->mac_addr = mac_addr;
	67
	68	LIST_PREPEND(static_fdb_entries, network->static_fdb_entries, fdb_entry);
	69
	70	if (section) {
	71	fdb_entry->section = section;
	72	hashmap_put(network->fdb_entries_by_section,
	73	UINT_TO_PTR(fdb_entry->section), fdb_entry);
	74	}
	75
	76	/* return allocated FDB structure. */
	77	*ret = fdb_entry;
	78	fdb_entry = NULL;
	79
	80	return 0;
	81	}
	82
	83	static int set_fdb_handler(sd_rtnl rtnl, sd_rtnl_message m, void *userdata) {
ea6ec096	84	Link *link = userdata;
b98b483b AR	85	int r;
b98b483b AR	86
ea6ec096	87	assert(link);
b98b483b AR	88
b98b483b AR	89	r = sd_rtnl_message_get_errno(m);
ea6ec096	90	if (r < 0 && r != -EEXIST)
6a7a4e4d	91	log_link_error_errno(link, r, "Could not add FDB entry: %m");
b98b483b AR	92
	93	return 1;
	94	}
	95
	96	/* send a request to the kernel to add a FDB entry in its static MAC table. */
a245ced0	97	int fdb_entry_configure(Link const link, FdbEntry const fdb_entry) {
b98b483b	98	_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
ea6ec096	99	sd_rtnl *rtnl;
b98b483b AR	100	int r;
b98b483b AR	101
ea6ec096 TG	102	assert(link);
ea6ec096 TG	103	assert(link->manager);
b98b483b	104	assert(fdb_entry);
ea6ec096 TG	105
ea6ec096 TG	106	rtnl = link->manager->rtnl;
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
	113	/* only NTF_SELF flag supported. */
	114	r = sd_rtnl_message_neigh_set_flags(req, NTF_SELF);
	115	if (r < 0)
	116	return rtnl_log_create_error(r);
	117
	118	/* only NUD_PERMANENT state supported. */
	119	r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP \| NUD_PERMANENT);
	120	if (r < 0)
	121	return rtnl_log_create_error(r);
	122
	123	r = sd_rtnl_message_append_ether_addr(req, NDA_LLADDR, fdb_entry->mac_addr);
	124	if (r < 0)
	125	return rtnl_log_create_error(r);
	126
	127	/* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
	128	if (0 != fdb_entry->vlan_id) {
	129	r = sd_rtnl_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id);
	130	if (r < 0)
	131	return rtnl_log_create_error(r);
	132	}
	133
	134	/* send message to the kernel to update its internal static MAC table. */
ea6ec096	135	r = sd_rtnl_call_async(rtnl, req, set_fdb_handler, link, 0, NULL);
6a7a4e4d LP	136	if (r < 0)
6a7a4e4d LP	137	return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
b98b483b AR	138
	139	return 0;
	140	}
	141
	142	/* remove and FDB entry. */
	143	void fdb_entry_free(FdbEntry *fdb_entry) {
	144	if(!fdb_entry)
	145	return;
	146
	147	if(fdb_entry->network) {
	148	LIST_REMOVE(static_fdb_entries, fdb_entry->network->static_fdb_entries,
	149	fdb_entry);
	150
	151	if(fdb_entry->section)
	152	hashmap_remove(fdb_entry->network->fdb_entries_by_section,
	153	UINT_TO_PTR(fdb_entry->section));
	154	}
	155
	156	free(fdb_entry->mac_addr);
	157
	158	free(fdb_entry);
	159	}
	160
	161	/* parse the HW address from config files. */
	162	int config_parse_fdb_hwaddr(const char *unit,
	163	const char *filename,
	164	unsigned line,
	165	const char *section,
	166	unsigned section_line,
	167	const char *lvalue,
	168	int ltype,
	169	const char *rvalue,
	170	void *data,
	171	void *userdata) {
	172	Network *network = userdata;
	173	_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
	174	int r;
	175
	176	assert(filename);
	177	assert(section);
	178	assert(lvalue);
	179	assert(rvalue);
	180	assert(data);
	181
	182	r = fdb_entry_new_static(network, section_line, &fdb_entry);
6a7a4e4d LP	183	if (r < 0)
6a7a4e4d LP	184	return log_oom();
b98b483b AR	185
	186	/* read in the MAC address for the FDB table. */
	187	r = sscanf(rvalue, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
	188	&fdb_entry->mac_addr->ether_addr_octet[0],
	189	&fdb_entry->mac_addr->ether_addr_octet[1],
	190	&fdb_entry->mac_addr->ether_addr_octet[2],
	191	&fdb_entry->mac_addr->ether_addr_octet[3],
	192	&fdb_entry->mac_addr->ether_addr_octet[4],
	193	&fdb_entry->mac_addr->ether_addr_octet[5]);
	194
	195	if (ETHER_ADDR_LEN != r) {
	196	log_syntax(unit, LOG_ERR, filename, line, EINVAL,
	197	"Not a valid MAC address, ignoring assignment: %s", rvalue);
	198	return 0;
	199	}
	200
	201	fdb_entry = NULL;
	202
	203	return 0;
	204	}
	205
	206	/* parse the VLAN Id from config files. */
	207	int config_parse_fdb_vlan_id(const char *unit,
	208	const char *filename,
	209	unsigned line,
	210	const char *section,
	211	unsigned section_line,
	212	const char *lvalue,
	213	int ltype,
	214	const char *rvalue,
	215	void *data,
	216	void *userdata) {
	217	Network *network = userdata;
	218	_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
	219	int r;
	220
	221	assert(filename);
	222	assert(section);
	223	assert(lvalue);
	224	assert(rvalue);
	225	assert(data);
	226
	227	r = fdb_entry_new_static(network, section_line, &fdb_entry);
6a7a4e4d LP	228	if (r < 0)
6a7a4e4d LP	229	return log_oom();
b98b483b AR	230
	231	r = config_parse_unsigned(unit, filename, line, section,
	232	section_line, lvalue, ltype,
	233	rvalue, &fdb_entry->vlan_id, userdata);
6a7a4e4d	234	if (r < 0)
b98b483b	235	return r;
b98b483b AR	236
	237	fdb_entry = NULL;
	238
	239	return 0;
	240	}