[people/ms/network.git] / src / networkd / link.c

/*#############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2023 IPFire Network Development Team                          #
#                                                                             #
# This program is free software: you can redistribute it and/or modify        #
# it under the terms of the GNU General Public License as published by        #
# the Free Software Foundation, either version 3 of the License, or           #
# (at your option) any later version.                                         #
#                                                                             #
# This program 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 General Public License for more details.                                #
#                                                                             #
# You should have received a copy of the GNU General Public License           #
# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
#                                                                             #
#############################################################################*/

#include <linux/if.h>
#include <linux/if_link.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>

#include <systemd/sd-device.h>
#include <systemd/sd-netlink.h>

#include "daemon.h"
#include "json.h"
#include "link.h"
#include "links.h"
#include "logging.h"
#include "string.h"

struct nw_link {
	nw_daemon* daemon;
	int nrefs;

	// Interface Index
	int ifindex;

	// Interface Name
	char ifname[IFNAMSIZ];

	enum nw_link_state {
		NW_LINK_UNKNOWN = 0,
		NW_LINK_DESTROYED,
	} state;

	// Device
	struct sd_device* device;

	// Stats
	struct rtnl_link_stats64 stats64;

	// MTU
	uint32_t mtu;
	uint32_t min_mtu;
	uint32_t max_mtu;

	// Flags
	unsigned int flags;
	uint8_t operstate;
};

static int nw_link_setup_device(nw_link* link) {
	int r;

	// Fetch sd-device
	r = sd_device_new_from_ifindex(&link->device, link->ifindex);
	if (r < 0) {
		ERROR("Could not fetch sd-device for link %d: %s\n", link->ifindex, strerror(-r));
		return r;
	}

	return 0;
}

static void nw_link_free(nw_link* link) {
	DEBUG("Freeing link (ifindex = %d)\n", link->ifindex);

	if (link->device)
		sd_device_unref(link->device);
	if (link->daemon)
		nw_daemon_unref(link->daemon);
}

int nw_link_create(nw_link** link, nw_daemon* daemon, int ifindex) {
	int r;

	// Allocate a new object
	nw_link* l = calloc(1, sizeof(*l));
	if (!l)
		return -errno;

	// Store a reference to the daemon
	l->daemon = nw_daemon_ref(daemon);

	// Initialize the reference counter
	l->nrefs = 1;

	// Store the ifindex
	l->ifindex = ifindex;

	DEBUG("New link allocated (ifindex = %d)\n", l->ifindex);

	r = nw_link_setup_device(l);
	if (r < 0)
		goto ERROR;

	*link = l;
	return 0;

ERROR:
	nw_link_free(l);
	return r;
}

nw_link* nw_link_ref(nw_link* link) {
	link->nrefs++;

	return link;
}

nw_link* nw_link_unref(nw_link* link) {
	if (--link->nrefs > 0)
		return link;

	nw_link_free(link);
	return NULL;
}

/*
	This is a helper function for when we pass a reference to the event loop
	it will have to dereference the link instance later.
*/
static void __nw_link_unref(void* data) {
	nw_link* link = (nw_link*)data;

	nw_link_unref(link);
}

int nw_link_ifindex(nw_link* link) {
	return link->ifindex;
}

const char* nw_link_ifname(nw_link* link) {
	// Return NULL if name isn't set
	if (!*link->ifname)
		return NULL;

	return link->ifname;
}

// Stats

const struct rtnl_link_stats64* nw_link_get_stats64(nw_link* link) {
	return &link->stats64;
}

static int nw_link_call_getlink(nw_link* link,
		int (*callback)(sd_netlink* rtnl, sd_netlink_message* m, void* data)) {
	sd_netlink_message* m = NULL;
	int r;

	sd_netlink* rtnl = nw_daemon_get_rtnl(link->daemon);
	if (!rtnl)
		return 1;

	// Create a new message
	r = sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, link->ifindex);
	if (r < 0) {
		ERROR("Could not allocate RTM_GETLINK message: %m\n");
		goto ERROR;
	}

	// Send the message
	r = sd_netlink_call_async(rtnl, NULL, m, callback,
		__nw_link_unref, nw_link_ref(link), -1, NULL);
	if (r < 0) {
		ERROR("Could not send rtnetlink message: %m\n");
		goto ERROR;
	}

ERROR:
	if (m)
		sd_netlink_message_unref(m);

	return r;
}

static int __nw_link_update_stats(sd_netlink* rtnl, sd_netlink_message* m, void* data) {
	nw_link* link = (nw_link*)data;
	int r;

	// Fetch the stats
	r = sd_netlink_message_read(m, IFLA_STATS64, sizeof(link->stats64), &link->stats64);
	if (r < 0)
		return r;

	DEBUG("Link %d: Stats updated\n", link->ifindex);

	// Log stats
	DEBUG("  Packets    : RX: %12llu, TX: %12llu\n",
		link->stats64.rx_packets, link->stats64.tx_packets);
	DEBUG("  Bytes      : RX: %12llu, TX: %12llu\n",
		link->stats64.rx_bytes,   link->stats64.tx_bytes);
	DEBUG("  Errors     : RX: %12llu, TX: %12llu\n",
		link->stats64.rx_errors,  link->stats64.tx_errors);
	DEBUG("  Dropped    : RX: %12llu, TX: %12llu\n",
		link->stats64.rx_dropped, link->stats64.rx_dropped);
	DEBUG("  Multicast  : %llu\n", link->stats64.multicast);
	DEBUG("  Collisions : %llu\n", link->stats64.collisions);

	// Notify ports that stats have been updated
	r = nw_daemon_ports_walk(link->daemon, __nw_port_update_stats, link);
	if (r)
		return r;

	// Notify zones that stats have been updated
	r = nw_daemon_zones_walk(link->daemon, __nw_zone_update_stats, link);
	if (r)
		return r;

	return 0;
}

int nw_link_update_stats(nw_link* link) {
	return nw_link_call_getlink(link, __nw_link_update_stats);
}

// Carrier

int nw_link_has_carrier(nw_link* link) {
	return link->operstate == IF_OPER_UP;
}

static int nw_link_carrier_gained(nw_link* link) {
	return 0; // XXX TODO
}

static int nw_link_carrier_lost(nw_link* link) {
	return 0; // XXX TODO
}

static int nw_link_update_ifname(nw_link* link, sd_netlink_message* message) {
	const char* ifname = NULL;
	int r;

	r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
	if (r < 0) {
		ERROR("Could not read link name for link %d: %m\n", link->ifindex);
		return 1;
	}

	// Do nothing if the name is already set
	if (strcmp(link->ifname, ifname) == 0)
		return 0;

	// Otherwise update the name
	r = nw_string_set(link->ifname, ifname);
	if (r) {
		ERROR("Could not set link name: %m\n");
		return 1;
	}

	DEBUG("Link %d has been renamed to '%s'\n", link->ifindex, link->ifname);

	// Assign link to ports
	nw_daemon_ports_walk(link->daemon, __nw_port_set_link, link);

	// Assign link to zones
	nw_daemon_zones_walk(link->daemon, __nw_zone_set_link, link);

	return 0;
}

static int nw_link_update_mtu(nw_link* link, sd_netlink_message* message) {
	uint32_t mtu = 0;
	uint32_t min_mtu = 0;
	uint32_t max_mtu = 0;
	int r;

	// Read the MTU
	r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
	if (r < 0) {
		ERROR("Could not read MTU for link %d: %m\n", link->ifindex);
		return r;
	}

	// Read the minimum MTU
	r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
	if (r < 0) {
		ERROR("Could not read the minimum MTU for link %d: %m\n", link->ifindex);
		return r;
	}

	// Read the maximum MTU
	r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
	if (r < 0) {
		ERROR("Could not read the maximum MTU for link %d: %m\n", link->ifindex);
		return r;
	}

	// Set the maximum MTU to infinity
	if (!max_mtu)
		max_mtu = UINT32_MAX;

	// Store min/max MTU
	link->min_mtu = min_mtu;
	link->max_mtu = max_mtu;

	// End here, if the MTU has not been changed
	if (link->mtu == mtu)
		return 0;

	DEBUG("Link %d: MTU has changed to %" PRIu32 " (min: %" PRIu32 ", max: %" PRIu32 ")\n",
		link->ifindex, link->mtu, link->min_mtu, link->max_mtu);

	// Store MTU
	link->mtu = mtu;

	return 0;
}

static int nw_link_update_flags(nw_link* link, sd_netlink_message* message) {
	unsigned int flags = 0;
	uint8_t operstate = 0;
	int r;

	// Fetch flags
	r = sd_rtnl_message_link_get_flags(message, &flags);
	if (r < 0) {
		DEBUG("Could not read link flags: %m\n");
		return 1;
	}

#if 0
	// Fetch operstate
	r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
	if (r < 1) {
		ERROR("Could not read operstate: %m\n");
		return 1;
	}
#endif

	// End here if there have been no changes
	if (link->flags == flags && link->operstate == operstate)
		return 0;

	// XXX We should log any changes here

	// Fetch current carrier state
	const int had_carrier = nw_link_has_carrier(link);

	// Store the new flags & operstate
	link->flags = flags;
	link->operstate = operstate;

	// Notify if carrier was gained or lost
	if (!had_carrier && nw_link_has_carrier(link)) {
		r = nw_link_carrier_gained(link);
		if (r < 0)
			return r;

	} else if (had_carrier && !nw_link_has_carrier(link)) {
		r = nw_link_carrier_lost(link);
		if (r < 0)
			return r;
	}

	return 0;
}

/*
	This function is called whenever anything changes, so that we can
	update our internal link object.
*/
static int nw_link_update(nw_link* link, sd_netlink_message* message) {
	int r;

	// Update the interface name
	r = nw_link_update_ifname(link, message);
	if (r)
		return r;

	// Update the MTU
	r = nw_link_update_mtu(link, message);
	if (r)
		return r;

	// Update flags
	r = nw_link_update_flags(link, message);
	if (r)
		return r;

	return 0;
}

int nw_link_process(sd_netlink* rtnl, sd_netlink_message* message, void* data) {
	nw_links* links = NULL;
	nw_link* link = NULL;
	const char* ifname = NULL;
	int ifindex;
	uint16_t type;
	int r;

	nw_daemon* daemon = (nw_daemon*)data;

	// Fetch links
	links = nw_daemon_links(daemon);
	if (!links) {
		r = 1;
		goto ERROR;
	}

	// Check if this message could be received
	if (sd_netlink_message_is_error(message)) {
		r = sd_netlink_message_get_errno(message);
		if (r < 0)
			ERROR("Could not receive link message: %m\n");

		goto IGNORE;
	}

	// Fetch the message type
	r = sd_netlink_message_get_type(message, &type);
	if (r < 0) {
		ERROR("Could not fetch message type: %m\n");
		goto IGNORE;
	}

	// Check type
	switch (type) {
		case RTM_NEWLINK:
		case RTM_DELLINK:
			break;

		default:
			ERROR("Received an unexpected message (type %u)\n", type);
			goto IGNORE;
	}

	// Fetch the interface index
	r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
	if (r < 0) {
		ERROR("Could not fetch ifindex: %m\n");
		goto IGNORE;
	}

	// Check interface index
	if (ifindex <= 0) {
		ERROR("Received an invalid ifindex\n");
		goto IGNORE;
	}

	// Fetch the interface name
	r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
	if (r < 0) {
		ERROR("Received a netlink message without interface name: %m\n");
		goto IGNORE;
	}

	// Try finding an existing link
	link = nw_daemon_get_link_by_ifindex(daemon, ifindex);

	switch (type) {
		case RTM_NEWLINK:
			// If the link doesn't exist, create it
			if (!link) {
				r = nw_link_create(&link, daemon, ifindex);
				if (r) {
					ERROR("Could not create link: %m\n");
					goto ERROR;
				}

				// Add it to the list
				r = nw_links_add_link(links, link);
				if (r)
					goto ERROR;
			}

			// Import any data from the netlink message
			r = nw_link_update(link, message);
			if (r)
				goto ERROR;

			break;

		case RTM_DELLINK:
			if (link)
				nw_links_drop_link(links, link);

			break;
	}

IGNORE:
	r = 0;

ERROR:
	if (links)
		nw_links_unref(links);
	if (link)
		nw_link_unref(link);

	return r;
}

static int __nw_link_destroy(sd_netlink* rtnl, sd_netlink_message* m, void* data) {
	nw_link* link = (nw_link*)data;
	int r;

	// Check if the operation was successful
	r = sd_netlink_message_get_errno(m);
	if (r < 0) {
		ERROR("Could not remove link %d: %m\n", link->ifindex);
		// XXX We should extract the error message

		return 0;
	}

	// Mark this link as destroyed
	link->state = NW_LINK_DESTROYED;

	return 0;
}

int nw_link_destroy(nw_link* link) {
	sd_netlink_message* m = NULL;
	int r;

	sd_netlink* rtnl = nw_daemon_get_rtnl(link->daemon);
	if (!rtnl)
		return 1;

	DEBUG("Destroying link %d\n", link->ifindex);

	// Create a new message
	r = sd_rtnl_message_new_link(rtnl, &m, RTM_DELLINK, link->ifindex);
	if (r < 0) {
		ERROR("Could not allocate RTM_DELLINK message: %m\n");
		goto ERROR;
	}

	// Send the message
	r = sd_netlink_call_async(rtnl, NULL, m, __nw_link_destroy,
		__nw_link_unref, nw_link_ref(link), -1, NULL);
	if (r < 0) {
		ERROR("Could not send rtnetlink message: %m\n");
		goto ERROR;
	}

ERROR:
	if (m)
		sd_netlink_message_unref(m);

	return r;
}

// JSON

static int nw_link_device_to_json(nw_link* link, struct json_object* o) {
	const char* driver = NULL;
	const char* vendor = NULL;
	const char* model = NULL;
	int r;

	// Fetch driver
	r = sd_device_get_driver(link->device, &driver);
	if (r < 0 && r != -ENOENT)
		return r;

	// Add driver
	if (driver) {
		r = json_object_add_string(o, "Driver", driver);
		if (r < 0)
			return r;
	}

	// Fetch vendor
	r = sd_device_get_property_value(link->device, "ID_VENDOR_FROM_DATABASE", &vendor);
	if (r < 0) {
		r = sd_device_get_property_value(link->device, "ID_VENDOR", &vendor);
		if (r < 0 && r != -ENOENT)
			return r;
	}

	// Add vendor
	if (vendor) {
		r = json_object_add_string(o, "Vendor", vendor);
		if (r < 0)
			return r;
	}

	// Fetch model
	r = sd_device_get_property_value(link->device, "ID_MODEL_FROM_DATABASE", &model);
	if (r < 0) {
		r = sd_device_get_property_value(link->device, "ID_MODEL", &model);
		if (r < 0 && r != -ENOENT)
			return r;
	}

	// Add model
	if (model) {
		r = json_object_add_string(o, "Model", model);
		if (r < 0)
			return r;
	}

	return 0;
}

int nw_link_to_json(nw_link* link, struct json_object* o) {
	int r;

	// Add ifindex
	r = json_object_add_int64(o, "LinkIndex", link->ifindex);
	if (r < 0)
		return r;

	// Add sd-device stuff
	r = nw_link_device_to_json(link, o);
	if (r < 0)
		return r;

	return 0;
}
Commit	Line	Data
87a1e1e0 MT	1	/*#############################################################################
	2	# #
	3	# IPFire.org - A linux based firewall #
	4	# Copyright (C) 2023 IPFire Network Development Team #
	5	# #
	6	# This program is free software: you can redistribute it and/or modify #
	7	# it under the terms of the GNU General Public License as published by #
	8	# the Free Software Foundation, either version 3 of the License, or #
	9	# (at your option) any later version. #
	10	# #
	11	# This program is distributed in the hope that it will be useful, #
	12	# but WITHOUT ANY WARRANTY; without even the implied warranty of #
	13	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
	14	# GNU General Public License for more details. #
	15	# #
	16	# You should have received a copy of the GNU General Public License #
	17	# along with this program. If not, see <http://www.gnu.org/licenses/>. #
	18	# #
	19	#############################################################################*/
	20
dfd49c2c	21	#include <linux/if.h>
15240e08	22	#include <linux/if_link.h>
87a1e1e0 MT	23	#include <stddef.h>
87a1e1e0 MT	24	#include <stdlib.h>
f650f6cd	25	#include <string.h>
87a1e1e0	26
cf75e1db	27	#include <systemd/sd-device.h>
766f08ca MT	28	#include <systemd/sd-netlink.h>
766f08ca MT	29
87a1e1e0	30	#include "daemon.h"
69467266	31	#include "json.h"
87a1e1e0	32	#include "link.h"
766f08ca	33	#include "links.h"
eaf649ee	34	#include "logging.h"
f650f6cd	35	#include "string.h"
87a1e1e0 MT	36
87a1e1e0 MT	37	struct nw_link {
2361667e	38	nw_daemon* daemon;
87a1e1e0 MT	39	int nrefs;
	40
	41	// Interface Index
	42	int ifindex;
f650f6cd MT	43
f650f6cd MT	44	// Interface Name
dfd49c2c	45	char ifname[IFNAMSIZ];
f37df5ea	46
371b836a MT	47	enum nw_link_state {
	48	NW_LINK_UNKNOWN = 0,
	49	NW_LINK_DESTROYED,
	50	} state;
	51
cf75e1db MT	52	// Device
	53	struct sd_device* device;
	54
15240e08 MT	55	// Stats
	56	struct rtnl_link_stats64 stats64;
	57
f37df5ea MT	58	// MTU
	59	uint32_t mtu;
	60	uint32_t min_mtu;
	61	uint32_t max_mtu;
c65300b4 MT	62
	63	// Flags
	64	unsigned int flags;
69ef50c7	65	uint8_t operstate;
87a1e1e0 MT	66	};
87a1e1e0 MT	67
cf75e1db MT	68	static int nw_link_setup_device(nw_link* link) {
	69	int r;
	70
	71	// Fetch sd-device
	72	r = sd_device_new_from_ifindex(&link->device, link->ifindex);
	73	if (r < 0) {
	74	ERROR("Could not fetch sd-device for link %d: %s\n", link->ifindex, strerror(-r));
	75	return r;
	76	}
	77
	78	return 0;
	79	}
	80
	81	static void nw_link_free(nw_link* link) {
	82	DEBUG("Freeing link (ifindex = %d)\n", link->ifindex);
	83
	84	if (link->device)
	85	sd_device_unref(link->device);
	86	if (link->daemon)
	87	nw_daemon_unref(link->daemon);
	88	}
	89
2361667e	90	int nw_link_create(nw_link** link, nw_daemon* daemon, int ifindex) {
cf75e1db MT	91	int r;
cf75e1db MT	92
87a1e1e0	93	// Allocate a new object
2361667e	94	nw_link* l = calloc(1, sizeof(*l));
87a1e1e0	95	if (!l)
cf75e1db	96	return -errno;
87a1e1e0 MT	97
	98	// Store a reference to the daemon
	99	l->daemon = nw_daemon_ref(daemon);
	100
	101	// Initialize the reference counter
	102	l->nrefs = 1;
	103
	104	// Store the ifindex
	105	l->ifindex = ifindex;
	106
766f08ca MT	107	DEBUG("New link allocated (ifindex = %d)\n", l->ifindex);
766f08ca MT	108
cf75e1db MT	109	r = nw_link_setup_device(l);
	110	if (r < 0)
	111	goto ERROR;
87a1e1e0	112
cf75e1db	113	*link = l;
87a1e1e0	114	return 0;
766f08ca	115
cf75e1db MT	116	ERROR:
	117	nw_link_free(l);
	118	return r;
87a1e1e0 MT	119	}
87a1e1e0 MT	120
2361667e	121	nw_link* nw_link_ref(nw_link* link) {
87a1e1e0 MT	122	link->nrefs++;
	123
	124	return link;
	125	}
	126
2361667e	127	nw_link* nw_link_unref(nw_link* link) {
87a1e1e0 MT	128	if (--link->nrefs > 0)
	129	return link;
	130
	131	nw_link_free(link);
	132	return NULL;
	133	}
eaf649ee	134
371b836a MT	135	/*
	136	This is a helper function for when we pass a reference to the event loop
	137	it will have to dereference the link instance later.
	138	*/
	139	static void __nw_link_unref(void* data) {
	140	nw_link* link = (nw_link*)data;
	141
	142	nw_link_unref(link);
	143	}
	144
2361667e	145	int nw_link_ifindex(nw_link* link) {
766f08ca MT	146	return link->ifindex;
766f08ca MT	147	}
eaf649ee	148
207abe4e	149	const char* nw_link_ifname(nw_link* link) {
611d4aca MT	150	// Return NULL if name isn't set
	151	if (!*link->ifname)
	152	return NULL;
	153
207abe4e MT	154	return link->ifname;
	155	}
	156
15240e08 MT	157	// Stats
	158
	159	const struct rtnl_link_stats64* nw_link_get_stats64(nw_link* link) {
	160	return &link->stats64;
	161	}
	162
	163	static int nw_link_call_getlink(nw_link* link,
	164	int (callback)(sd_netlink rtnl, sd_netlink_message* m, void* data)) {
	165	sd_netlink_message* m = NULL;
	166	int r;
	167
	168	sd_netlink* rtnl = nw_daemon_get_rtnl(link->daemon);
	169	if (!rtnl)
	170	return 1;
	171
	172	// Create a new message
	173	r = sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, link->ifindex);
	174	if (r < 0) {
	175	ERROR("Could not allocate RTM_GETLINK message: %m\n");
	176	goto ERROR;
	177	}
	178
	179	// Send the message
	180	r = sd_netlink_call_async(rtnl, NULL, m, callback,
	181	__nw_link_unref, nw_link_ref(link), -1, NULL);
	182	if (r < 0) {
	183	ERROR("Could not send rtnetlink message: %m\n");
	184	goto ERROR;
	185	}
	186
	187	ERROR:
	188	if (m)
	189	sd_netlink_message_unref(m);
	190
	191	return r;
	192	}
	193
	194	static int __nw_link_update_stats(sd_netlink* rtnl, sd_netlink_message* m, void* data) {
	195	nw_link* link = (nw_link*)data;
	196	int r;
	197
	198	// Fetch the stats
	199	r = sd_netlink_message_read(m, IFLA_STATS64, sizeof(link->stats64), &link->stats64);
	200	if (r < 0)
	201	return r;
	202
	203	DEBUG("Link %d: Stats updated\n", link->ifindex);
	204
	205	// Log stats
	206	DEBUG(" Packets : RX: %12llu, TX: %12llu\n",
	207	link->stats64.rx_packets, link->stats64.tx_packets);
	208	DEBUG(" Bytes : RX: %12llu, TX: %12llu\n",
	209	link->stats64.rx_bytes, link->stats64.tx_bytes);
	210	DEBUG(" Errors : RX: %12llu, TX: %12llu\n",
	211	link->stats64.rx_errors, link->stats64.tx_errors);
	212	DEBUG(" Dropped : RX: %12llu, TX: %12llu\n",
	213	link->stats64.rx_dropped, link->stats64.rx_dropped);
	214	DEBUG(" Multicast : %llu\n", link->stats64.multicast);
	215	DEBUG(" Collisions : %llu\n", link->stats64.collisions);
	216
	217	// Notify ports that stats have been updated
	218	r = nw_daemon_ports_walk(link->daemon, __nw_port_update_stats, link);
	219	if (r)
	220	return r;
221
222	// Notify zones that stats have been updated
223	r = nw_daemon_zones_walk(link->daemon, __nw_zone_update_stats, link);
224	if (r)
225	return r;
226
227	return 0;
228	}
229
230	int nw_link_update_stats(nw_link* link) {
231	return nw_link_call_getlink(link, __nw_link_update_stats);
232	}
233
dfd49c2c MT	234	// Carrier
	235
	236	int nw_link_has_carrier(nw_link* link) {
	237	return link->operstate == IF_OPER_UP;
	238	}
	239
	240	static int nw_link_carrier_gained(nw_link* link) {
	241	return 0; // XXX TODO
	242	}
	243
	244	static int nw_link_carrier_lost(nw_link* link) {
	245	return 0; // XXX TODO
	246	}
	247
2361667e	248	static int nw_link_update_ifname(nw_link* link, sd_netlink_message* message) {
f650f6cd MT	249	const char* ifname = NULL;
	250	int r;
	251
	252	r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
	253	if (r < 0) {
	254	ERROR("Could not read link name for link %d: %m\n", link->ifindex);
	255	return 1;
	256	}
	257
	258	// Do nothing if the name is already set
	259	if (strcmp(link->ifname, ifname) == 0)
	260	return 0;
	261
	262	// Otherwise update the name
	263	r = nw_string_set(link->ifname, ifname);
	264	if (r) {
	265	ERROR("Could not set link name: %m\n");
	266	return 1;
	267	}
	268
	269	DEBUG("Link %d has been renamed to '%s'\n", link->ifindex, link->ifname);
	270
611d4aca MT	271	// Assign link to ports
	272	nw_daemon_ports_walk(link->daemon, __nw_port_set_link, link);
	273
	274	// Assign link to zones
	275	nw_daemon_zones_walk(link->daemon, __nw_zone_set_link, link);
	276
f650f6cd MT	277	return 0;
	278	}
	279
2361667e	280	static int nw_link_update_mtu(nw_link* link, sd_netlink_message* message) {
f37df5ea MT	281	uint32_t mtu = 0;
	282	uint32_t min_mtu = 0;
	283	uint32_t max_mtu = 0;
	284	int r;
	285
	286	// Read the MTU
	287	r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
	288	if (r < 0) {
	289	ERROR("Could not read MTU for link %d: %m\n", link->ifindex);
	290	return r;
	291	}
	292
	293	// Read the minimum MTU
	294	r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
	295	if (r < 0) {
	296	ERROR("Could not read the minimum MTU for link %d: %m\n", link->ifindex);
	297	return r;
	298	}
	299
	300	// Read the maximum MTU
	301	r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
	302	if (r < 0) {
	303	ERROR("Could not read the maximum MTU for link %d: %m\n", link->ifindex);
	304	return r;
	305	}
	306
	307	// Set the maximum MTU to infinity
	308	if (!max_mtu)
	309	max_mtu = UINT32_MAX;
	310
	311	// Store min/max MTU
	312	link->min_mtu = min_mtu;
	313	link->max_mtu = max_mtu;
	314
	315	// End here, if the MTU has not been changed
	316	if (link->mtu == mtu)
	317	return 0;
	318
	319	DEBUG("Link %d: MTU has changed to %" PRIu32 " (min: %" PRIu32 ", max: %" PRIu32 ")\n",
	320	link->ifindex, link->mtu, link->min_mtu, link->max_mtu);
	321
	322	// Store MTU
	323	link->mtu = mtu;
	324
	325	return 0;
	326	}
	327
c65300b4 MT	328	static int nw_link_update_flags(nw_link* link, sd_netlink_message* message) {
c65300b4 MT	329	unsigned int flags = 0;
69ef50c7	330	uint8_t operstate = 0;
c65300b4 MT	331	int r;
	332
	333	// Fetch flags
	334	r = sd_rtnl_message_link_get_flags(message, &flags);
	335	if (r < 0) {
1a70a686	336	DEBUG("Could not read link flags: %m\n");
c65300b4 MT	337	return 1;
	338	}
	339
c403eb4c	340	#if 0
69ef50c7 MT	341	// Fetch operstate
	342	r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
	343	if (r < 1) {
	344	ERROR("Could not read operstate: %m\n");
	345	return 1;
	346	}
c403eb4c	347	#endif
69ef50c7	348
c65300b4	349	// End here if there have been no changes
69ef50c7	350	if (link->flags == flags && link->operstate == operstate)
c65300b4 MT	351	return 0;
	352
	353	// XXX We should log any changes here
	354
dfd49c2c MT	355	// Fetch current carrier state
	356	const int had_carrier = nw_link_has_carrier(link);
	357
69ef50c7	358	// Store the new flags & operstate
c65300b4	359	link->flags = flags;
69ef50c7 MT	360	link->operstate = operstate;
69ef50c7 MT	361
dfd49c2c MT	362	// Notify if carrier was gained or lost
	363	if (!had_carrier && nw_link_has_carrier(link)) {
	364	r = nw_link_carrier_gained(link);
	365	if (r < 0)
	366	return r;
	367
	368	} else if (had_carrier && !nw_link_has_carrier(link)) {
	369	r = nw_link_carrier_lost(link);
	370	if (r < 0)
	371	return r;
	372	}
c65300b4 MT	373
	374	return 0;
	375	}
	376
f650f6cd MT	377	/*
	378	This function is called whenever anything changes, so that we can
	379	update our internal link object.
	380	*/
2361667e	381	static int nw_link_update(nw_link* link, sd_netlink_message* message) {
f650f6cd MT	382	int r;
	383
	384	// Update the interface name
	385	r = nw_link_update_ifname(link, message);
	386	if (r)
	387	return r;
	388
f37df5ea MT	389	// Update the MTU
	390	r = nw_link_update_mtu(link, message);
	391	if (r)
	392	return r;
	393
c65300b4 MT	394	// Update flags
	395	r = nw_link_update_flags(link, message);
	396	if (r)
	397	return r;
	398
f650f6cd MT	399	return 0;
	400	}
	401
766f08ca	402	int nw_link_process(sd_netlink* rtnl, sd_netlink_message* message, void* data) {
2361667e MT	403	nw_links* links = NULL;
2361667e MT	404	nw_link* link = NULL;
766f08ca MT	405	const char* ifname = NULL;
	406	int ifindex;
	407	uint16_t type;
	408	int r;
	409
2361667e	410	nw_daemon* daemon = (nw_daemon*)data;
766f08ca MT	411
	412	// Fetch links
	413	links = nw_daemon_links(daemon);
	414	if (!links) {
	415	r = 1;
	416	goto ERROR;
	417	}
	418
	419	// Check if this message could be received
	420	if (sd_netlink_message_is_error(message)) {
	421	r = sd_netlink_message_get_errno(message);
	422	if (r < 0)
	423	ERROR("Could not receive link message: %m\n");
	424
	425	goto IGNORE;
	426	}
	427
	428	// Fetch the message type
	429	r = sd_netlink_message_get_type(message, &type);
	430	if (r < 0) {
	431	ERROR("Could not fetch message type: %m\n");
	432	goto IGNORE;
	433	}
	434
	435	// Check type
	436	switch (type) {
	437	case RTM_NEWLINK:
	438	case RTM_DELLINK:
	439	break;
	440
	441	default:
	442	ERROR("Received an unexpected message (type %u)\n", type);
	443	goto IGNORE;
	444	}
	445
	446	// Fetch the interface index
	447	r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
	448	if (r < 0) {
	449	ERROR("Could not fetch ifindex: %m\n");
	450	goto IGNORE;
	451	}
	452
	453	// Check interface index
	454	if (ifindex <= 0) {
	455	ERROR("Received an invalid ifindex\n");
	456	goto IGNORE;
	457	}
	458
	459	// Fetch the interface name
	460	r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
	461	if (r < 0) {
	462	ERROR("Received a netlink message without interface name: %m\n");
	463	goto IGNORE;
	464	}
	465
	466	// Try finding an existing link
	467	link = nw_daemon_get_link_by_ifindex(daemon, ifindex);
	468
	469	switch (type) {
	470	case RTM_NEWLINK:
	471	// If the link doesn't exist, create it
	472	if (!link) {
	473	r = nw_link_create(&link, daemon, ifindex);
	474	if (r) {
475	ERROR("Could not create link: %m\n");
476	goto ERROR;
477	}
b8a1a68c MT	478
	479	// Add it to the list
	480	r = nw_links_add_link(links, link);
	481	if (r)
	482	goto ERROR;
766f08ca MT	483	}
766f08ca MT	484
f650f6cd MT	485	// Import any data from the netlink message
	486	r = nw_link_update(link, message);
	487	if (r)
	488	goto ERROR;
766f08ca	489
766f08ca MT	490	break;
	491
	492	case RTM_DELLINK:
	493	if (link)
	494	nw_links_drop_link(links, link);
	495
	496	break;
	497	}
	498
	499	IGNORE:
	500	r = 0;
	501
	502	ERROR:
	503	if (links)
	504	nw_links_unref(links);
	505	if (link)
	506	nw_link_unref(link);
	507
	508	return r;
eaf649ee	509	}
371b836a MT	510
	511	static int __nw_link_destroy(sd_netlink* rtnl, sd_netlink_message* m, void* data) {
	512	nw_link* link = (nw_link*)data;
	513	int r;
	514
	515	// Check if the operation was successful
	516	r = sd_netlink_message_get_errno(m);
	517	if (r < 0) {
	518	ERROR("Could not remove link %d: %m\n", link->ifindex);
	519	// XXX We should extract the error message
	520
	521	return 0;
	522	}
	523
	524	// Mark this link as destroyed
	525	link->state = NW_LINK_DESTROYED;
	526
	527	return 0;
	528	}
	529
	530	int nw_link_destroy(nw_link* link) {
	531	sd_netlink_message* m = NULL;
	532	int r;
	533
	534	sd_netlink* rtnl = nw_daemon_get_rtnl(link->daemon);
	535	if (!rtnl)
	536	return 1;
	537
	538	DEBUG("Destroying link %d\n", link->ifindex);
	539
	540	// Create a new message
	541	r = sd_rtnl_message_new_link(rtnl, &m, RTM_DELLINK, link->ifindex);
	542	if (r < 0) {
	543	ERROR("Could not allocate RTM_DELLINK message: %m\n");
	544	goto ERROR;
	545	}
	546
	547	// Send the message
	548	r = sd_netlink_call_async(rtnl, NULL, m, __nw_link_destroy,
	549	__nw_link_unref, nw_link_ref(link), -1, NULL);
	550	if (r < 0) {
	551	ERROR("Could not send rtnetlink message: %m\n");
	552	goto ERROR;
	553	}
	554
	555	ERROR:
	556	if (m)
	557	sd_netlink_message_unref(m);
	558
	559	return r;
	560	}
69467266 MT	561
	562	// JSON
	563
cf75e1db MT	564	static int nw_link_device_to_json(nw_link* link, struct json_object* o) {
	565	const char* driver = NULL;
	566	const char* vendor = NULL;
	567	const char* model = NULL;
	568	int r;
	569
	570	// Fetch driver
	571	r = sd_device_get_driver(link->device, &driver);
	572	if (r < 0 && r != -ENOENT)
	573	return r;
	574
	575	// Add driver
	576	if (driver) {
	577	r = json_object_add_string(o, "Driver", driver);
	578	if (r < 0)
	579	return r;
	580	}
	581
	582	// Fetch vendor
	583	r = sd_device_get_property_value(link->device, "ID_VENDOR_FROM_DATABASE", &vendor);
	584	if (r < 0) {
	585	r = sd_device_get_property_value(link->device, "ID_VENDOR", &vendor);
	586	if (r < 0 && r != -ENOENT)
	587	return r;
	588	}
	589
	590	// Add vendor
	591	if (vendor) {
	592	r = json_object_add_string(o, "Vendor", vendor);
	593	if (r < 0)
	594	return r;
	595	}
	596
	597	// Fetch model
	598	r = sd_device_get_property_value(link->device, "ID_MODEL_FROM_DATABASE", &model);
	599	if (r < 0) {
	600	r = sd_device_get_property_value(link->device, "ID_MODEL", &model);
	601	if (r < 0 && r != -ENOENT)
	602	return r;
	603	}
	604
	605	// Add model
	606	if (model) {
	607	r = json_object_add_string(o, "Model", model);
	608	if (r < 0)
	609	return r;
	610	}
	611
	612	return 0;
	613	}
	614
69467266 MT	615	int nw_link_to_json(nw_link* link, struct json_object* o) {
	616	int r;
	617
	618	// Add ifindex
	619	r = json_object_add_int64(o, "LinkIndex", link->ifindex);
	620	if (r < 0)
	621	return r;
	622
cf75e1db MT	623	// Add sd-device stuff
	624	r = nw_link_device_to_json(link, o);
	625	if (r < 0)
	626	return r;
	627
69467266 MT	628	return 0;
69467266 MT	629	}