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networkd: Introduce Link Layer Discovery Protocol (LLDP)

Browse Source 
This patch introduces LLDP support to networkd. it implements the
receiver side of the protocol.

The Link Layer Discovery Protocol (LLDP) is an industry-standard,
vendor-neutral method to allow networked devices to advertise
capabilities, identity, and other information onto a LAN. The Layer 2
protocol, detailed in IEEE 802.1AB-2005.LLDP allows network devices
that operate at the lower layers of a protocol stack (such as
Layer 2 bridges and switches) to learn some of the capabilities
and characteristics of LAN devices available to higher
layer protocols.
This commit is contained in:
Susant Sahani 2014-11-23 09:46:36 +05:30
parent 266b538958
commit ad1ad5c8e3
13 changed files with 2171 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
Makefile.am
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@ -3079,7 +3079,18 @@ libsystemd_network_la_SOURCES = \
src/libsystemd-network/dhcp6-network.c \
src/libsystemd-network/dhcp6-option.c \
src/libsystemd-network/dhcp6-lease-internal.h \
src/libsystemd-network/sd-dhcp6-lease.c
src/libsystemd-network/sd-dhcp6-lease.c \
src/libsystemd-network/lldp.h \
src/libsystemd-network/lldp-tlv.h \
src/libsystemd-network/lldp-tlv.c \
src/libsystemd-network/lldp-network.h \
src/libsystemd-network/lldp-network.c \
src/libsystemd-network/lldp-port.h \
src/libsystemd-network/lldp-port.c \
src/libsystemd-network/lldp-internal.h \
src/libsystemd-network/lldp-internal.c \
src/libsystemd-network/sd-lldp.h \
src/libsystemd-network/sd-lldp.c
libsystemd_network_la_LIBADD = \
libudev-internal.la \
@ -3158,13 +3169,25 @@ test_dhcp6_client_LDADD = \
libsystemd-internal.la \
libsystemd-shared.la
test_lldp_SOURCES = \
src/libsystemd-network/lldp.h \
src/libsystemd-network/lldp-tlv.h \
src/libsystemd-network/lldp-tlv.c \
src/libsystemd-network/test-lldp.c
test_lldp_LDADD = \
libsystemd-network.la \
libsystemd-internal.la \
libsystemd-shared.la
tests += \
test-dhcp-option \
test-dhcp-client \
test-dhcp-server \
test-ipv4ll \
test-icmp6-rs \
test-dhcp6-client
test-dhcp6-client \
test-lldp
manual_tests += \
test-pppoe

437
src/libsystemd-network/lldp-internal.c Normal file
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@ -0,0 +1,437 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Tom Gundersen
Copyright (C) 2014 Susant Sahani
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 "lldp-internal.h"
/* We store maximum 1K chassis entries */
#define LLDP_MIB_MAX_CHASSIS 1024
/* Maximum Ports can be attached to any chassis */
#define LLDP_MIB_MAX_PORT_PER_CHASSIS 32
int lldp_read_chassis_id(tlv_packet *tlv,
uint8_t *type,
uint16_t *length,
uint8_t **data) {
uint8_t subtype;
int r;
assert_return(tlv, -EINVAL);
r = lldp_tlv_packet_enter_container(tlv, LLDP_TYPE_CHASSIS_ID);
if (r < 0)
goto out2;
r = tlv_packet_read_u8(tlv, &subtype);
if (r < 0)
goto out1;
switch (subtype) {
case LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS:
r = tlv_packet_read_bytes(tlv, data, length);
if (r < 0)
goto out1;
break;
default:
r = -ENOTSUP;
break;
}
*type = subtype;
out1:
(void)lldp_tlv_packet_exit_container(tlv);
out2:
return r;
}
int lldp_read_port_id(tlv_packet *tlv,
uint8_t *type,
uint16_t *length,
uint8_t **data) {
uint8_t subtype;
char *s;
int r;
assert_return(tlv, -EINVAL);
r = lldp_tlv_packet_enter_container(tlv, LLDP_TYPE_PORT_ID);
if (r < 0)
goto out2;
r = tlv_packet_read_u8(tlv, &subtype);
if (r < 0)
goto out1;
switch (subtype) {
case LLDP_PORT_SUBTYPE_INTERFACE_NAME:
r = tlv_packet_read_string(tlv, &s, length);
if (r < 0)
goto out1;
*data = (uint8_t *) s;
break;
case LLDP_PORT_SUBTYPE_MAC_ADDRESS:
r = tlv_packet_read_bytes(tlv, data, length);
if (r < 0)
goto out1;
break;
default:
r = -ENOTSUP;
break;
}
*type = subtype;
out1:
(void)lldp_tlv_packet_exit_container(tlv);
out2:
return r;
}
int lldp_read_ttl(tlv_packet *tlv, uint16_t *ttl) {
int r;
assert_return(tlv, -EINVAL);
r = lldp_tlv_packet_enter_container(tlv, LLDP_TYPE_TTL);
if (r < 0)
goto out;
r = tlv_packet_read_u16(tlv, ttl);
(void) lldp_tlv_packet_exit_container(tlv);
out:
return r;
}
/* 10.5.5.2.2 mibUpdateObjects ()
* The mibUpdateObjects () procedure updates the MIB objects corresponding to
* the TLVs contained in the received LLDPDU for the LLDP remote system
* indicated by the LLDP remote systems update process defined in 10.3.5 */
int lldp_mib_update_objects(lldp_chassis *c, tlv_packet *tlv) {
lldp_neighbour_port *p;
uint16_t length, ttl;
uint8_t *data;
uint8_t type;
int r;
assert_return(c, -EINVAL);
assert_return(tlv, -EINVAL);
r = lldp_read_port_id(tlv, &type, &length, &data);
if (r < 0)
return r;
/* Update the packet if we already have */
LIST_FOREACH(port, p, c->ports) {
if ((p->type == type && p->length == length && !memcmp(p->data, data, p->length))) {
r = lldp_read_ttl(tlv, &ttl);
if (r < 0)
return r;
p->until = ttl * USEC_PER_SEC + now(clock_boottime_or_monotonic());
tlv_packet_free(p->packet);
p->packet = tlv;
prioq_reshuffle(p->c->by_expiry, p, &p->prioq_idx);
return 0;
}
}
return -1;
}
int lldp_mib_remove_objects(lldp_chassis *c, tlv_packet *tlv) {
lldp_neighbour_port *p, *q;
uint8_t *data;
uint16_t length;
uint8_t type;
int r;
assert_return(c, -EINVAL);
assert_return(tlv, -EINVAL);
r = lldp_read_port_id(tlv, &type, &length, &data);
if (r < 0)
return r;
LIST_FOREACH_SAFE(port, p, q, c->ports) {
/* Find the port */
if (p->type == type && p->length == length && !memcmp(p->data, data, p->length)) {
lldp_neighbour_port_remove_and_free(p);
break;
}
}
return 0;
}
int lldp_mib_add_objects(Prioq *by_expiry,
Hashmap *neighbour_mib,
tlv_packet *tlv) {
_cleanup_lldp_neighbour_port_free_ lldp_neighbour_port *p = NULL;
_cleanup_lldp_chassis_free_ lldp_chassis *c = NULL;
lldp_chassis_id chassis_id;
bool new_chassis = false;
uint8_t subtype, *data;
uint16_t ttl, length;
int r;
assert_return(by_expiry, -EINVAL);
assert_return(neighbour_mib, -EINVAL);
assert_return(tlv, -EINVAL);
r = lldp_read_chassis_id(tlv, &subtype, &length, &data);
if (r < 0)
goto drop;
r = lldp_read_ttl(tlv, &ttl);
if (r < 0)
goto drop;
/* Make hash key */
chassis_id.type = subtype;
chassis_id.length = length;
chassis_id.data = data;
/* Try to find the Chassis */
c = hashmap_get(neighbour_mib, &chassis_id);
if (!c) {
/* Don't create chassis if ttl 0 is received . Silently drop it */
if (ttl == 0) {
log_lldp("TTL value 0 received. Skiping Chassis creation.");
goto drop;
}
/* Admission Control: Can we store this packet ? */
if (hashmap_size(neighbour_mib) >= LLDP_MIB_MAX_CHASSIS) {
log_lldp("Exceeding number of chassie: %d. Dropping ...",
hashmap_size(neighbour_mib));
goto drop;
}
r = lldp_chassis_new(tlv, by_expiry, neighbour_mib, &c);
if (r < 0)
goto drop;
new_chassis = true;
r = hashmap_put(neighbour_mib, &c->chassis_id, c);
if (r < 0)
goto drop;
} else {
/* When the TTL field is set to zero, the receiving LLDP agent is notified all
* system information associated with the LLDP agent/port is to be deleted */
if (ttl == 0) {
log_lldp("TTL value 0 received . Deleting associated Port ...");
lldp_mib_remove_objects(c, tlv);
c = NULL;
goto drop;
}
/* if we already have this port just update it */
r = lldp_mib_update_objects(c, tlv);
if (r >= 0) {
c = NULL;
return r;
}
/* Admission Control: Can this port attached to the existing chassis ? */
if (REFCNT_GET(c->n_ref) >= LLDP_MIB_MAX_PORT_PER_CHASSIS) {
log_lldp("Port limit reached. Chassis has: %d ports. Dropping ...",
REFCNT_GET(c->n_ref));
c = NULL;
goto drop;
}
}
/* This is a new port */
r = lldp_neighbour_port_new(c, tlv, &p);
if (r < 0)
goto drop;
r = prioq_put(c->by_expiry, p, &p->prioq_idx);
if (r < 0)
goto drop;
/* Attach new port to chassis */
LIST_PREPEND(port, c->ports, p);
REFCNT_INC(c->n_ref);
p = NULL;
c = NULL;
return 0;
drop:
tlv_packet_free(tlv);
if (new_chassis)
hashmap_remove(neighbour_mib, &c->chassis_id);
return r;
}
void lldp_neighbour_port_remove_and_free(lldp_neighbour_port *p) {
lldp_chassis *c;
assert(p);
assert(p->c);
c = p->c;
prioq_remove(c->by_expiry, p, &p->prioq_idx);
LIST_REMOVE(port, c->ports, p);
lldp_neighbour_port_free(p);
/* Drop the Chassis if no port is attached */
if (REFCNT_DEC(c->n_ref) <= 1) {
hashmap_remove(c->neighbour_mib, &c->chassis_id);
lldp_chassis_free(c);
}
}
void lldp_neighbour_port_free(lldp_neighbour_port *p) {
if(!p)
return;
tlv_packet_free(p->packet);
free(p->data);
free(p);
}
int lldp_neighbour_port_new(lldp_chassis *c,
tlv_packet *tlv,
lldp_neighbour_port **ret) {
_cleanup_lldp_neighbour_port_free_ lldp_neighbour_port *p;
uint16_t length, ttl;
uint8_t *data;
uint8_t type;
int r;
assert(tlv);
r = lldp_read_port_id(tlv, &type, &length, &data);
if (r < 0)
return r;
r = lldp_read_ttl(tlv, &ttl);
if (r < 0)
return r;
p = new0(lldp_neighbour_port, 1);
if (!p)
return -ENOMEM;
p->c = c;
p->type = type;
p->length = length;
p->packet = tlv;
p->prioq_idx = PRIOQ_IDX_NULL;
p->until = ttl * USEC_PER_SEC + now(clock_boottime_or_monotonic());
p->data = memdup(data, length);
if (!p->data)
return -ENOMEM;
*ret = p;
p = NULL;
return 0;
}
void lldp_chassis_free(lldp_chassis *c) {
if (!c)
return;
if (REFCNT_GET(c->n_ref) > 1)
return;
free(c->chassis_id.data);
free(c);
}
int lldp_chassis_new(tlv_packet *tlv,
Prioq *by_expiry,
Hashmap *neighbour_mib,
lldp_chassis **ret) {
_cleanup_lldp_chassis_free_ lldp_chassis *c;
uint16_t length;
uint8_t *data;
uint8_t type;
int r;
assert(tlv);
r = lldp_read_chassis_id(tlv, &type, &length, &data);
if (r < 0)
return r;
c = new0(lldp_chassis, 1);
if (!c)
return -ENOMEM;
c->n_ref = REFCNT_INIT;
c->chassis_id.type = type;
c->chassis_id.length = length;
c->chassis_id.data = memdup(data, length);
if (!c->chassis_id.data)
return -ENOMEM;
LIST_HEAD_INIT(c->ports);
c->by_expiry = by_expiry;
c->neighbour_mib = neighbour_mib;
*ret = c;
c = NULL;
return 0;
}

93
src/libsystemd-network/lldp-internal.h Normal file
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@ -0,0 +1,93 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Tom Gundersen
Copyright (C) 2014 Susant Sahani
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/>.
***/
#pragma once
#include "log.h"
#include "list.h"
#include "refcnt.h"
#include "lldp-tlv.h"
#include "prioq.h"
typedef struct lldp_neighbour_port lldp_neighbour_port;
typedef struct lldp_chassis lldp_chassis;
typedef struct lldp_chassis_id lldp_chassis_id;
struct lldp_neighbour_port {
uint8_t type;
uint8_t *data;
uint16_t length;
usec_t until;
unsigned prioq_idx;
lldp_chassis *c;
tlv_packet *packet;
LIST_FIELDS(lldp_neighbour_port, port);
};
int lldp_neighbour_port_new(lldp_chassis *c, tlv_packet *tlv, lldp_neighbour_port **ret);
void lldp_neighbour_port_free(lldp_neighbour_port *p);
void lldp_neighbour_port_remove_and_free(lldp_neighbour_port *p);
DEFINE_TRIVIAL_CLEANUP_FUNC(lldp_neighbour_port *, lldp_neighbour_port_free);
#define _cleanup_lldp_neighbour_port_free_ _cleanup_(lldp_neighbour_port_freep)
struct lldp_chassis_id {
uint8_t type;
uint16_t length;
uint8_t *data;
};
struct lldp_chassis {
RefCount n_ref;
lldp_chassis_id chassis_id;
Prioq *by_expiry;
Hashmap *neighbour_mib;
LIST_HEAD(lldp_neighbour_port, ports);
};
int lldp_chassis_new(tlv_packet *tlv,
Prioq *by_expiry,
Hashmap *neighbour_mib,
lldp_chassis **ret);
void lldp_chassis_free(lldp_chassis *c);
DEFINE_TRIVIAL_CLEANUP_FUNC(lldp_chassis *, lldp_chassis_free);
#define _cleanup_lldp_chassis_free_ _cleanup_(lldp_chassis_freep)
int lldp_mib_update_objects(lldp_chassis *c, tlv_packet *tlv);
int lldp_mib_add_objects(Prioq *by_expiry, Hashmap *neighbour_mib, tlv_packet *tlv);
int lldp_mib_remove_objects(lldp_chassis *c, tlv_packet *tlv);
int lldp_read_chassis_id(tlv_packet *tlv, uint8_t *type, uint16_t *length, uint8_t **data);
int lldp_read_port_id(tlv_packet *tlv, uint8_t *type, uint16_t *length, uint8_t **data);
int lldp_read_ttl(tlv_packet *tlv, uint16_t *ttl);
#define log_lldp(fmt, ...) log_internal(LOG_DEBUG, 0, __FILE__, __LINE__, __func__, "LLDP: " fmt, ##__VA_ARGS__)

111
src/libsystemd-network/lldp-network.c Normal file
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@ -0,0 +1,111 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Tom Gundersen
Copyright (C) 2014 Susant Sahani
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 <linux/filter.h>
#include <linux/if_ether.h>
#include "socket-util.h"
#include "lldp-tlv.h"
#include "lldp-network.h"
#include "sd-lldp.h"
int lldp_network_bind_raw_socket(int ifindex) {
typedef struct LLDPFrame {
struct ethhdr hdr;
uint8_t tlvs[0];
} LLDPFrame;
struct sock_filter filter[] = {
BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(LLDPFrame, hdr.h_dest)), /* A <- 4 bytes of destination MAC */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0180c200, 1, 0), /* A != 01:80:c2:00 */
BPF_STMT(BPF_RET + BPF_K, 0), /* drop packet */
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(LLDPFrame, hdr.h_dest) + 4), /* A <- remaining 2 bytes of destination MAC */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0000, 3, 0), /* A != 00:00 */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0003, 2, 0), /* A != 00:03 */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x000e, 1, 0), /* A != 00:0e */
BPF_STMT(BPF_RET + BPF_K, 0), /* drop packet */
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(LLDPFrame, hdr.h_proto)), /* A <- protocol */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_LLDP, 1, 0), /* A != ETHERTYPE_LLDP */
BPF_STMT(BPF_RET + BPF_K, 0), /* drop packet */
BPF_STMT(BPF_RET + BPF_K, (uint32_t) -1), /* accept packet */
};
struct sock_fprog fprog = {
.len = ELEMENTSOF(filter),
.filter = filter
};
_cleanup_close_ int s = -1;
union sockaddr_union saddrll = {
.ll.sll_family = AF_PACKET,
.ll.sll_ifindex = ifindex,
};
int r;
assert(ifindex > 0);
s = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (s < 0)
return -errno;
r = setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog));
if (r < 0)
return -errno;
r = bind(s, &saddrll.sa, sizeof(saddrll.ll));
if (r < 0)
return -errno;
r = s;
s = -1;
return r;
}
int lldp_receive_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
_cleanup_tlv_packet_free_ tlv_packet *packet = NULL;
tlv_packet *p;
uint16_t length;
int r;
assert(fd);
assert(userdata);
r = tlv_packet_new(&packet);
if (r < 0)
return r;
length = read(fd, &packet->pdu, sizeof(packet->pdu));
/* Silently drop the packet */
if ((size_t) length > ETHER_MAX_LEN)
return 0;
packet->userdata = userdata;
p = packet;
packet = NULL;
return lldp_handle_packet(p, (uint16_t) length);
}

28
src/libsystemd-network/lldp-network.h Normal file
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@ -0,0 +1,28 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Tom Gundersen
Copyright (C) 2014 Susant Sahani
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/>.
***/
#pragma once
#include "sd-event.h"
int lldp_network_bind_raw_socket(int ifindex);
int lldp_receive_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata);

116
src/libsystemd-network/lldp-port.c Normal file
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@ -0,0 +1,116 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Tom Gundersen
Copyright (C) 2014 Susant Sahani
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 "async.h"
#include "lldp-port.h"
#include "lldp-network.h"
int lldp_port_start(lldp_port *p) {
int r;
assert_return(p, -EINVAL);
r = lldp_network_bind_raw_socket(p->ifindex);
if (r < 0)
return r;
p->rawfd = r;
r = sd_event_add_io(p->event, &p->lldp_port_rx,
p->rawfd, EPOLLIN, lldp_receive_packet, p);
if (r < 0) {
log_debug("Failed to allocate event source: %s", strerror(-r));
return r;
}
r = sd_event_source_set_priority(p->lldp_port_rx, p->event_priority);
if (r < 0) {
log_debug("Failed to set event priority: %s", strerror(-r));
goto fail;
}
r = sd_event_source_set_description(p->lldp_port_rx, "lldp-port-rx");
if (r < 0) {
log_debug("Failed to set event name: %s", strerror(-r));
goto fail;
}
return 0;
fail:
lldp_port_stop(p);
return r;
}
int lldp_port_stop(lldp_port *p) {
assert_return(p, -EINVAL);
p->rawfd = asynchronous_close(p->rawfd);
p->lldp_port_rx = sd_event_source_unref(p->lldp_port_rx);
return 0;
}
void lldp_port_free(lldp_port *p) {
if (!p)
return;
lldp_port_stop(p);
free(p->ifname);
free(p);
}
int lldp_port_new(int ifindex,
char *ifname,
const struct ether_addr *addr,
void *userdata,
lldp_port **ret) {
_cleanup_free_ lldp_port *p = NULL;
assert_return(ifindex, -EINVAL);
assert_return(ifname, -EINVAL);
assert_return(addr, -EINVAL);
p = new0(lldp_port, 1);
if (!p)
return -ENOMEM;
p->rawfd = -1;
p->ifindex = ifindex;
p->ifname = strdup(ifname);
if (!p->ifname)
return -ENOMEM;
memcpy(&p->mac, addr, ETH_ALEN);
p->userdata = userdata;
*ret = p;
p = NULL;
return 0;
}

61
src/libsystemd-network/lldp-port.h Normal file
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Tom Gundersen
Copyright (C) 2014 Susant Sahani
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/>.
***/
#pragma once
#include <net/ethernet.h>
#include "sd-event.h"
#include "sd-lldp.h"
typedef struct lldp_port lldp_port;
struct lldp_port {
LLDPPortStatus status;
int ifindex;
char *ifname;
struct ether_addr mac;
int rawfd;
sd_event *event;
sd_event_source *lldp_port_rx;
int event_priority;
void *userdata;
};
int lldp_port_new(int ifindex,
char *ifname,
const struct ether_addr *addr,
void *userdata,
lldp_port **ret);
void lldp_port_free(lldp_port *p);
DEFINE_TRIVIAL_CLEANUP_FUNC(lldp_port*, lldp_port_free);
#define _cleanup_lldp_port_free_ _cleanup_(lldp_port_freep)
int lldp_port_start(lldp_port *p);
int lldp_port_stop(lldp_port *p);

321
src/libsystemd-network/lldp-tlv.c Normal file
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Tom Gundersen
Copyright (C) 2014 Susant Sahani
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 <arpa/inet.h>
#include "macro.h"
#include "lldp-tlv.h"
int tlv_section_new(tlv_section **ret) {
tlv_section *s;
s = new0(tlv_section, 1);
if (!s)
return -ENOMEM;
*ret = s;
return 0;
}
void tlv_section_free(tlv_section *m) {
if (!m)
return;
free(m);
}
int tlv_packet_new(tlv_packet **ret) {
tlv_packet *m;
m = new0(tlv_packet, 1);
if (!m)
return -ENOMEM;
LIST_HEAD_INIT(m->sections);
*ret = m;
return 0;
}
void tlv_packet_free(tlv_packet *m) {
tlv_section *s, *n;
if (!m)
return;
LIST_FOREACH_SAFE(section, s, n, m->sections)
tlv_section_free(s);
free(m);
}
int tlv_packet_append_bytes(tlv_packet *m, const void *data, size_t data_length) {
uint8_t *p;
assert_return(m, -EINVAL);
assert_return(data, -EINVAL);
assert_return(data_length, -EINVAL);
if (m->length + data_length > ETHER_MAX_LEN)
return -ENOMEM;
p = m->pdu + m->length;
memcpy(p, data, data_length);
m->length += data_length;
return 0;
}
int tlv_packet_append_u8(tlv_packet *m, uint8_t data) {
assert_return(m, -EINVAL);
return tlv_packet_append_bytes(m, &data, sizeof(uint8_t));
}
int tlv_packet_append_u16(tlv_packet *m, uint16_t data) {
uint16_t type;
assert_return(m, -EINVAL);
type = htons(data);
return tlv_packet_append_bytes(m, &type, sizeof(uint16_t));
}
int tlv_packet_append_u32(tlv_packet *m, uint32_t data) {
uint32_t type;
assert_return(m, -EINVAL);
type = htonl(data);
return tlv_packet_append_bytes(m, &type, sizeof(uint32_t));
}
int tlv_packet_append_string(tlv_packet *m, char *data, uint16_t size) {
assert_return(m, -EINVAL);
return tlv_packet_append_bytes(m, data, size);
}
int lldp_tlv_packet_open_container(tlv_packet *m, uint16_t type) {
assert_return(m, -EINVAL);
m->container_pos = m->pdu + m->length;
return tlv_packet_append_u16(m, type << 9);
}
int lldp_tlv_packet_close_container(tlv_packet *m) {
uint16_t type;
assert_return(m, -EINVAL);
assert_return(m->container_pos, -EINVAL);
memcpy(&type, m->container_pos, sizeof(uint16_t));
type |= htons(((m->pdu + m->length) - (m->container_pos + 2)) & 0x01ff);
memcpy(m->container_pos, &type, sizeof(uint16_t));
return 0;
}
static inline int tlv_packet_read_internal(tlv_section *m, void **data) {
assert_return(m->read_pos, -EINVAL);
*data = m->read_pos;
return 0;
}
int tlv_packet_read_u8(tlv_packet *m, uint8_t *data) {
void *val;
int r;
assert_return(m, -EINVAL);
r = tlv_packet_read_internal(m->container, &val);
if (r < 0)
return r;
memcpy(data, val, sizeof(uint8_t));
m->container->read_pos ++;
return 0;
}
int tlv_packet_read_u16(tlv_packet *m, uint16_t *data) {
uint16_t t;
void *val;
int r;
assert_return(m, -EINVAL);
r = tlv_packet_read_internal(m->container, &val);
if (r < 0)
return r;
memcpy(&t, val, sizeof(uint16_t));
*data = ntohs(t);
m->container->read_pos += 2;
return 0;
}
int tlv_packet_read_u32(tlv_packet *m, uint32_t *data) {
uint32_t t;
void *val;
int r;
assert_return(m, -EINVAL);
r = tlv_packet_read_internal(m->container, &val);
if (r < 0)
return r;
memcpy(&t, val, sizeof(uint32_t));
*data = ntohl(t);
m->container->read_pos += 4;
return r;
}
int tlv_packet_read_string(tlv_packet *m, char **data, uint16_t *data_length) {
void *val;
int r;
assert_return(m, -EINVAL);
r = tlv_packet_read_internal(m->container, &val);
if (r < 0)
return r;
*data = (char *) val;
*data_length = m->container->length;
m->container->read_pos += m->container->length;
return 0;
}
int tlv_packet_read_bytes(tlv_packet *m, uint8_t **data, uint16_t *data_length) {
void *val;
int r;
assert_return(m, -EINVAL);
r = tlv_packet_read_internal(m->container, &val);
if (r < 0)
return r;
*data = (uint8_t *) val;
*data_length = m->container->length;
m->container->read_pos += m->container->length;
return 0;
}
/* parse raw TLV packet */
int tlv_packet_parse_pdu(tlv_packet *m, uint16_t size) {
tlv_section *section, *tail;
uint16_t t, l;
uint8_t *p;
int r;
assert_return(m, -EINVAL);
assert_return(size, -EINVAL);
p = m->pdu;
/* extract ethernet herader */
memcpy(&m->mac, p, ETH_ALEN);
p += sizeof(struct ether_header);
for (l = 0; l <= size; ) {
r = tlv_section_new(&section);
if (r < 0)
return r;
memcpy(&t, p, sizeof(uint16_t));
section->type = ntohs(t) >> 9;
section->length = ntohs(t) & 0x01ff;
if (section->type == LLDP_TYPE_END || section->type >=_LLDP_TYPE_MAX) {
tlv_section_free(section);
break;
}
p += 2;
section->data = p;
LIST_FIND_TAIL(section, m->sections, tail);
LIST_INSERT_AFTER(section, m->sections, tail, section);
p += section->length;
l += (section->length + 2);
}
return 0;
}
int lldp_tlv_packet_enter_container(tlv_packet *m, uint16_t type) {
tlv_section *s;
assert_return(m, -EINVAL);
LIST_FOREACH(section, s, m->sections)
if (s->type == type)
break;
if (!s)
return -1;
m->container = s;
m->container->read_pos = s->data;
if (!m->container->read_pos) {
m->container = 0;
return -1;
}
return 0;
}
int lldp_tlv_packet_exit_container(tlv_packet *m) {
assert_return(m, -EINVAL);
m->container = 0;
return 0;
}

87
src/libsystemd-network/lldp-tlv.h Normal file
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Tom Gundersen
Copyright (C) 2014 Susant Sahani
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/>.
***/
#pragma once
#include <net/ethernet.h>
#include "util.h"
#include "lldp.h"
#include "list.h"
typedef struct tlv_packet tlv_packet;
typedef struct tlv_section tlv_section;
struct tlv_section {
uint16_t type;
uint16_t length;
uint8_t *read_pos;
uint8_t *data;
LIST_FIELDS(tlv_section, section);
};
int tlv_section_new(tlv_section **ret);
void tlv_section_free(tlv_section *ret);
struct tlv_packet {
uint16_t type;
uint16_t length;
usec_t ts;
uint8_t *container_pos;
uint8_t pdu[ETHER_MAX_LEN];
void *userdata;
struct ether_addr mac;
tlv_section *container;
LIST_HEAD(tlv_section, sections);
};
int tlv_packet_new(tlv_packet **ret);
void tlv_packet_free(tlv_packet *m);
DEFINE_TRIVIAL_CLEANUP_FUNC(tlv_packet*, tlv_packet_free);
#define _cleanup_tlv_packet_free_ _cleanup_(tlv_packet_freep)
int lldp_tlv_packet_open_container(tlv_packet *m, uint16_t type);
int lldp_tlv_packet_close_container(tlv_packet *m);
int tlv_packet_append_bytes(tlv_packet *m, const void *data, size_t data_length);
int tlv_packet_append_u8(tlv_packet *m, uint8_t data);
int tlv_packet_append_u16(tlv_packet *m, uint16_t data);
int tlv_packet_append_u32(tlv_packet *m, uint32_t data);
int tlv_packet_append_string(tlv_packet *m, char *data, uint16_t size);
int lldp_tlv_packet_enter_container(tlv_packet *m, uint16_t type);
int lldp_tlv_packet_exit_container(tlv_packet *m);
int tlv_packet_read_bytes(tlv_packet *m, uint8_t **data, uint16_t *data_length);
int tlv_packet_read_string(tlv_packet *m, char **data, uint16_t *data_length);
int tlv_packet_read_u8(tlv_packet *m, uint8_t *data);
int tlv_packet_read_u16(tlv_packet *m, uint16_t *data);
int tlv_packet_read_u32(tlv_packet *m, uint32_t *data);
int tlv_packet_parse_pdu(tlv_packet *t, uint16_t size);

115
src/libsystemd-network/lldp.h Normal file
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@ -0,0 +1,115 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Tom Gundersen
Copyright (C) 2014 Susant Sahani
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/>.
***/
#pragma once
#define LLDP_MULTICAST_ADDR { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x0e }
#define ETHERTYPE_LLDP 0x88cc
/* IEEE 802.3AB Clause 9: TLV Types */
typedef enum LLDPTypes {
LLDP_TYPE_END = 0,
LLDP_TYPE_CHASSIS_ID = 1,
LLDP_TYPE_PORT_ID = 2,
LLDP_TYPE_TTL = 3,
LLDP_TYPE_PORT_DESCRIPTION = 4,
LLDP_TYPE_SYSTEM_NAME = 5,
LLDP_TYPE_SYSTEM_DESCRIPTION = 6,
LLDP_TYPE_SYSTEM_CAPABILITIES = 7,
LLDP_TYPE_MGMT_ADDRESS = 8,
LLDP_TYPE_PRIVATE = 127,
_LLDP_TYPE_MAX,
_LLDP_TYPE_INVALID = -1,
} LLDPTypes;
/* IEEE 802.3AB Clause 9.5.2: Chassis subtypes */
typedef enum LLDPChassisSubtypes {
LLDP_CHASSIS_SUBTYPE_RESERVED = 0,
LLDP_CHASSIS_SUBTYPE_CHASSIS_COMPONENT = 1,
LLDP_CHASSIS_SUBTYPE_INTERFACE_ALIAS = 2,
LLDP_CHASSIS_SUBTYPE_PORT_COMPONENT = 3,
LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS = 4,
LLDP_CHASSIS_SUBTYPE_NETWORK_ADDRESS = 5,
LLDP_CHASSIS_SUBTYPE_INTERFACE_NAME = 6,
LLDP_CHASSIS_SUBTYPE_LOCALLY_ASSIGNED = 7,
_LLDP_CHASSIS_SUBTYPE_MAX,
_LLDP_CHASSIS_SUBTYPE_INVALID = -1,
} LLDPChassisSubtypes;
/* IEEE 802.3AB Clause 9.5.3: Port subtype */
typedef enum LLDPPortSubtypes {
LLDP_PORT_SUBTYPE_RESERVED = 0,
LLDP_PORT_SUBTYPE_INTERFACE_ALIAS = 1,
LLDP_PORT_SUBTYPE_PORT_COMPONENT = 2,
LLDP_PORT_SUBTYPE_MAC_ADDRESS = 3,
LLDP_PORT_SUBTYPE_NETWORK = 4,
LLDP_PORT_SUBTYPE_INTERFACE_NAME = 5,
LLDP_PORT_SUBTYPE_AGENT_CIRCUIT_ID = 6,
LLDP_PORT_SUBTYPE_LOCALLY_ASSIGNED = 7,
_LLDP_PORT_SUBTYPE_MAX,
_LLDP_PORT_SUBTYPE_INVALID = -1
} LLDPPortSubtypes;
typedef enum LLDPSystemCapabilities {
LLDP_SYSTEM_CAPABILITIES_OTHER = 1 << 0,
LLDP_SYSTEM_CAPABILITIES_REPEATER = 1 << 1,
LLDP_SYSTEM_CAPABILITIES_BRIDGE = 1 << 2,
LLDP_SYSTEM_CAPABILITIES_WLAN_AP = 1 << 3,
LLDP_SYSTEM_CAPABILITIES_ROUTER = 1 << 4,
LLDP_SYSTEM_CAPABILITIES_PHONE = 1 << 5,
LLDP_SYSTEM_CAPABILITIES_DOCSIS = 1 << 6,
LLDP_SYSTEM_CAPABILITIES_STATION = 1 << 7,
LLDP_SYSTEM_CAPABILITIES_CVLAN = 1 << 8,
LLDP_SYSTEM_CAPABILITIES_SVLAN = 1 << 9,
LLDP_SYSTEM_CAPABILITIES_TPMR = 1 << 10,
_LLDP_SYSTEM_CAPABILITIES_MAX,
_LLDP_SYSTEM_CAPABILITIES_INVALID = -1,
} LLDPSystemCapabilities;
typedef enum LLDPMedSubtype {
LLDP_MED_SUBTYPE_RESERVED = 0,
LLDP_MED_SUBTYPE_CAPABILITIES = 1,
LLDP_MED_SUBTYPE_NETWORK_POLICY = 2,
LLDP_MED_SUBTYPE_LOCATION_ID = 3,
LLDP_MED_SUBTYPE_EXTENDED_PVMDI = 4,
LLDP_MED_SUBTYPE_INV_HWREV = 5,
LLDP_MED_SUBTYPE_INV_FWREV = 6,
LLDP_MED_SUBTYPE_INV_SWREV = 7,
LLDP_MED_SUBTYPE_INV_SERIAL = 8,
LLDP_MED_SUBTYPE_INV_MANUFACTURER = 9,
LLDP_MED_SUBTYPE_INV_MODELNAME = 10,
LLDP_MED_SUBTYPE_INV_ASSETID = 11,
_LLDP_MED_SUBTYPE_MAX,
_LLDP_MED_SUBTYPE_INVALID = -1,
} LLDPMedSubtype;
typedef enum LLDPMedCapability {
LLDP_MED_CAPABILITY_CAPAPILITIES = 1 << 0,
LLDP_MED_CAPABILITY_NETWORK_POLICY = 1 << 1,
LLDP_MED_CAPABILITY_LOCATION_ID = 1 << 2,
LLDP_MED_CAPABILITY_EXTENDED_PSE = 1 << 3,
LLDP_MED_CAPABILITY_EXTENDED_PD = 1 << 4,
LLDP_MED_CAPABILITY_INVENTORY = 1 << 5,
LLDP_MED_CAPABILITY_MAX,
LLDP_MED_CAPABILITY_INVALID = -1,
} LLDPMedCapability;

493
src/libsystemd-network/sd-lldp.c Normal file
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@ -0,0 +1,493 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Tom Gundersen
Copyright (C) 2014 Susant Sahani
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 <arpa/inet.h>
#include "siphash24.h"
#include "hashmap.h"
#include "event-util.h"
#include "lldp-tlv.h"
#include "lldp-port.h"
#include "sd-lldp.h"
#include "prioq.h"
#include "lldp-internal.h"
/* Section 10.5.2.2 Reception counters */
struct lldp_agent_statitics {
uint64_t stats_ageouts_total;
uint64_t stats_frames_discarded_total;
uint64_t stats_frames_in_errors_total;
uint64_t stats_frames_in_total;
uint64_t stats_tlvs_discarded_total;
uint64_t stats_tlvs_unrecognized_total;
};
struct sd_lldp {
lldp_port *port;
Prioq *by_expiry;
Hashmap *neighbour_mib;
lldp_agent_statitics statitics;
};
static unsigned long chassis_id_hash_func(const void *p,
const uint8_t hash_key[HASH_KEY_SIZE]) {
uint64_t u;
const lldp_chassis_id *id = p;
assert(id);
siphash24((uint8_t *) &u, id->data, id->length, hash_key);
return (unsigned long) u;
}
static int chassis_id_compare_func(const void *_a, const void *_b) {
const lldp_chassis_id *a, *b;
a = _a;
b = _b;
assert(!a->length || a->data);
assert(!b->length || b->data);
if (a->type != b->type)
return -1;
if (a->length != b->length)
return a->length < b->length ? -1 : 1;
return memcmp(a->data, b->data, a->length);
}
static const struct hash_ops chassis_id_hash_ops = {
.hash = chassis_id_hash_func,
.compare = chassis_id_compare_func
};
static void lldp_mib_delete_objects(sd_lldp *lldp);
static int lldp_receive_frame(sd_lldp *lldp, tlv_packet *tlv) {
int r;
assert(lldp);
assert(tlv);
/* Remove expired packets */
if (prioq_size(lldp->by_expiry) > 0)
lldp_mib_delete_objects(lldp);
r = lldp_mib_add_objects(lldp->by_expiry, lldp->neighbour_mib, tlv);
if (r < 0)
goto out;
log_lldp("Packet added. MIB size: %d , PQ size: %d",
hashmap_size(lldp->neighbour_mib),
prioq_size(lldp->by_expiry));
lldp->statitics.stats_frames_in_total ++;
return 0;
out:
if (r < 0)
log_lldp("Receive frame failed: %s", strerror(-r));
return 0;
}
/* 10.3.2 LLDPDU validation: rxProcessFrame() */
int lldp_handle_packet(tlv_packet *tlv, uint16_t length) {
uint16_t type, len, i, l, t;
bool chassis_id = false;
bool malformed = false;
bool port_id = false;
bool ttl = false;
bool end = false;
lldp_port *port;
uint8_t *p, *q;
sd_lldp *lldp;
int r;
assert(tlv);
assert(length > 0);
port = (lldp_port *) tlv->userdata;
lldp = (sd_lldp *) port->userdata;
if (lldp->port->status == LLDP_PORT_STATUS_DISABLED) {
log_lldp("Port is disabled : %s . Dropping ...",
lldp->port->ifname);
goto out;
}
p = tlv->pdu;
p += sizeof(struct ether_header);
for (i = 1, l = 0; l <= length; i++) {
memcpy(&t, p, sizeof(uint16_t));
type = ntohs(t) >> 9;
len = ntohs(t) & 0x01ff;
if (type == LLDP_TYPE_END) {
if (len != 0) {
log_lldp("TLV type end is not length 0. Length:%d received . Dropping ...",
len);
malformed = true;
goto out;
}
end = true;
break;
} else if (type >=_LLDP_TYPE_MAX) {
log_lldp("TLV type not recognized %d . Dropping ...",
type);
malformed = true;
goto out;
}
/* skip type and lengh encoding */
p += 2;
q = p;
p += len;
l += (len + 2);
if (i <= 3) {
if (i != type) {
log_lldp("TLV missing or out of order. Dropping ...");
malformed = true;
goto out;
}
}
switch(type) {
case LLDP_TYPE_CHASSIS_ID:
if (len < 2) {
log_lldp("Received malformed Chassis ID TLV len = %d. Dropping",
len);
malformed = true;
goto out;
}
if (chassis_id) {
log_lldp("Duplicate Chassis ID TLV found. Dropping ...");
malformed = true;
goto out;
}
/* Look what subtype it has */
if (*q == LLDP_CHASSIS_SUBTYPE_RESERVED ||
*q > LLDP_CHASSIS_SUBTYPE_LOCALLY_ASSIGNED) {
log_lldp("Unknown subtype: %d found in Chassis ID TLV . Dropping ...",
*q);
malformed = true;
goto out;
}
chassis_id = true;
break;
case LLDP_TYPE_PORT_ID:
if (len < 2) {
log_lldp("Received malformed Port ID TLV len = %d. Dropping",
len);
malformed = true;
goto out;
}
if (port_id) {
log_lldp("Duplicate Port ID TLV found. Dropping ...");
malformed = true;
goto out;
}
/* Look what subtype it has */
if (*q == LLDP_PORT_SUBTYPE_RESERVED ||
*q > LLDP_PORT_SUBTYPE_LOCALLY_ASSIGNED) {
log_lldp("Unknown subtype: %d found in Port ID TLV . Dropping ...",
*q);
malformed = true;
goto out;
}
port_id = true;
break;
case LLDP_TYPE_TTL:
if(len != 2) {
log_lldp(
"Received invalid lenth: %d TTL TLV. Dropping ...",
len);
malformed = true;
goto out;
}
if (ttl) {
log_lldp("Duplicate TTL TLV found. Dropping ...");
malformed = true;
goto out;
}
ttl = true;
break;
default:
if (len == 0) {
log_lldp("TLV type = %d's, length 0 received . Dropping ...",
type);
malformed = true;
goto out;
}
break;
}
}
if(!chassis_id || !port_id || !ttl || !end) {
log_lldp( "One or more mandotory TLV missing . Dropping ...");
malformed = true;
goto out;
}
r = tlv_packet_parse_pdu(tlv, length);
if (r < 0) {
log_lldp( "Failed to parse the TLV. Dropping ...");
malformed = true;
goto out;
}
return lldp_receive_frame(lldp, tlv);
out:
if (malformed) {
lldp->statitics.stats_frames_discarded_total ++;
lldp->statitics.stats_frames_in_errors_total ++;
}
tlv_packet_free(tlv);
return 0;
}
static int ttl_expiry_item_prioq_compare_func(const void *a, const void *b) {
const lldp_neighbour_port *p = a, *q = b;
if (p->until < q->until)
return -1;
if (p->until > q->until)
return 1;
return 0;
}
/* 10.5.5.2.1 mibDeleteObjects ()
* The mibDeleteObjects () procedure deletes all information in the LLDP remote
* systems MIB associated with the MSAP identifier if an LLDPDU is received with
* an rxTTL value of zero (see 10.3.2) or the timing counter rxInfoTTL expires. */
static void lldp_mib_delete_objects(sd_lldp *lldp) {
lldp_neighbour_port *p;
usec_t t = 0;
/* Remove all entries that are past their TTL */
for (;;) {
if (prioq_size(lldp->by_expiry) <= 0)
break;
p = prioq_peek(lldp->by_expiry);
if (!p)
break;
if (t <= 0)
t = now(CLOCK_BOOTTIME);
if (p->until > t)
break;
lldp_neighbour_port_remove_and_free(p);
lldp->statitics.stats_ageouts_total ++;
}
}
static void lldp_mib_objects_flush(sd_lldp *lldp) {
lldp_neighbour_port *p, *q;
lldp_chassis *c;
assert(lldp);
assert(lldp->neighbour_mib);
assert(lldp->by_expiry);
/* Drop all packets */
while ((c = hashmap_steal_first(lldp->neighbour_mib))) {
LIST_FOREACH_SAFE(port, p, q, c->ports) {
lldp_neighbour_port_remove_and_free(p);
}
}
assert(hashmap_size(lldp->neighbour_mib) == 0);
assert(prioq_size(lldp->by_expiry) == 0);
}
int sd_lldp_start(sd_lldp *lldp) {
int r;
assert_return(lldp, -EINVAL);
assert_return(lldp->port, -EINVAL);
lldp->port->status = LLDP_PORT_STATUS_ENABLED;
r = lldp_port_start(lldp->port);
if (r < 0) {
log_lldp("Failed to start Port : %s , %s",
lldp->port->ifname,
strerror(-r));
return r;
}
return 0;
}
int sd_lldp_stop(sd_lldp *lldp) {
int r;
assert_return(lldp, -EINVAL);
assert_return(lldp->port, -EINVAL);
lldp->port->status = LLDP_PORT_STATUS_DISABLED;
r = lldp_port_stop(lldp->port);
if (r < 0)
return r;
lldp_mib_objects_flush(lldp);
return 0;
}
int sd_lldp_attach_event(sd_lldp *lldp, sd_event *event, int priority) {
int r;
assert_return(lldp, -EINVAL);
assert_return(!lldp->port->event, -EBUSY);
if (event)
lldp->port->event = sd_event_ref(event);
else {
r = sd_event_default(&lldp->port->event);
if (r < 0)
return r;
}
lldp->port->event_priority = priority;
return 0;
}
int sd_lldp_detach_event(sd_lldp *lldp) {
assert_return(lldp, -EINVAL);
lldp->port->event = sd_event_unref(lldp->port->event);
return 0;
}
void sd_lldp_free(sd_lldp *lldp) {
if (!lldp)
return;
/* Drop all packets */
lldp_mib_objects_flush(lldp);
lldp_port_free(lldp->port);
hashmap_free(lldp->neighbour_mib);
prioq_free(lldp->by_expiry);
free(lldp);
}
int sd_lldp_new(int ifindex,
char *ifname,
struct ether_addr *mac,
sd_lldp **ret) {
_cleanup_sd_lldp_free_ sd_lldp *lldp = NULL;
int r;
assert_return(ret, -EINVAL);
assert_return(ifindex > 0, -EINVAL);
assert_return(ifname, -EINVAL);
assert_return(mac, -EINVAL);
lldp = new0(sd_lldp, 1);
if (!lldp)
return -ENOMEM;
r = lldp_port_new(ifindex, ifname, mac, lldp, &lldp->port);
if (r < 0)
return r;
lldp->neighbour_mib = hashmap_new(&chassis_id_hash_ops);
if (!lldp->neighbour_mib)
return -ENOMEM;
r = prioq_ensure_allocated(&lldp->by_expiry,
ttl_expiry_item_prioq_compare_func);
if (r < 0)
return r;
*ret = lldp;
lldp = NULL;
return 0;
}

51
src/libsystemd-network/sd-lldp.h Normal file
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@ -0,0 +1,51 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Tom Gundersen
Copyright (C) 2014 Susant Sahani
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/>.
***/
#pragma once
#include "lldp-tlv.h"
#include "sd-event.h"
typedef struct sd_lldp sd_lldp;
typedef struct lldp_agent_statitics lldp_agent_statitics;
typedef enum LLDPPortStatus {
LLDP_PORT_STATUS_NONE,
LLDP_PORT_STATUS_ENABLED,
LLDP_PORT_STATUS_DISABLED,
_LLDP_PORT_STATUS_MAX,
_LLDP_PORT_STATUS_INVALID = -1,
} LLDPPortStatus;
int sd_lldp_new(int ifindex, char *ifname, struct ether_addr *mac, sd_lldp **ret);
void sd_lldp_free(sd_lldp *lldp);
DEFINE_TRIVIAL_CLEANUP_FUNC(sd_lldp *, sd_lldp_free);
#define _cleanup_sd_lldp_free_ _cleanup_(sd_lldp_freep)
int sd_lldp_start(sd_lldp *lldp);
int sd_lldp_stop(sd_lldp *lldp);
int sd_lldp_attach_event(sd_lldp *lldp, sd_event *event, int priority);
int sd_lldp_detach_event(sd_lldp *lldp);
int lldp_handle_packet(tlv_packet *m, uint16_t length);

233
src/libsystemd-network/test-lldp.c Normal file
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@ -0,0 +1,233 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Tom Gundersen
Copyright (C) 2014 Susant Sahani
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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <net/ethernet.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include "macro.h"
#include "lldp.h"
#include "lldp-tlv.h"
#define TEST_LLDP_PORT "em1"
#define TEST_LLDP_TYPE_SYSTEM_NAME "systemd-lldp"
#define TEST_LLDP_TYPE_SYSTEM_DESC "systemd-lldp-desc"
static struct ether_addr mac_addr = {
.ether_addr_octet = {'A', 'B', 'C', '1', '2', '3'}
};
static int lldp_build_tlv_packet(tlv_packet **ret) {
_cleanup_tlv_packet_free_ tlv_packet *m = NULL;
const uint8_t lldp_dst[] = LLDP_MULTICAST_ADDR;
struct ether_header ether;
/* Append ethernet header */
memset(&ether, 0, sizeof(ether));
memcpy(&ether.ether_dhost, lldp_dst, ETHER_ADDR_LEN);
memcpy(&ether.ether_shost, &mac_addr, ETHER_ADDR_LEN);
ether.ether_type = htons(ETHERTYPE_LLDP);
assert_se(tlv_packet_new(&m) >= 0);
assert_se(tlv_packet_append_bytes(m, &ether, sizeof(struct ether_header)) >= 0);
assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_CHASSIS_ID) >= 0);
assert_se(tlv_packet_append_u8(m, LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS) >= 0);
assert_se(tlv_packet_append_bytes(m, &mac_addr, ETHER_ADDR_LEN) >= 0);
assert_se(lldp_tlv_packet_close_container(m) >= 0);
/* port name */
assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_PORT_ID) >= 0);
assert_se(tlv_packet_append_u8(m, LLDP_PORT_SUBTYPE_INTERFACE_NAME) >= 0);
assert_se(tlv_packet_append_bytes(m, TEST_LLDP_PORT, strlen(TEST_LLDP_PORT) + 1) >= 0);
assert_se(lldp_tlv_packet_close_container(m) >= 0);
/* ttl */
assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_TTL) >= 0);
assert_se(tlv_packet_append_u16(m, 170) >= 0);
assert_se(lldp_tlv_packet_close_container(m) >= 0);
/* system name */
assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_SYSTEM_NAME) >= 0);
assert_se(tlv_packet_append_bytes(m, TEST_LLDP_TYPE_SYSTEM_NAME,
strlen(TEST_LLDP_TYPE_SYSTEM_NAME)) >= 0);
assert_se(lldp_tlv_packet_close_container(m) >= 0);
/* system descrition */
assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_SYSTEM_DESCRIPTION) >= 0);
assert_se(tlv_packet_append_bytes(m, TEST_LLDP_TYPE_SYSTEM_DESC,
strlen(TEST_LLDP_TYPE_SYSTEM_DESC)) >= 0);
assert_se(lldp_tlv_packet_close_container(m) >= 0);
/* Mark end of packet */
assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_END) >= 0);
assert_se(lldp_tlv_packet_close_container(m) >= 0);
*ret = m;
m = NULL;
return 0;
}
static int lldp_parse_chassis_tlv(tlv_packet *m, uint8_t *type) {
uint8_t *p, subtype;
uint16_t length;
assert_se(lldp_tlv_packet_enter_container(m, LLDP_TYPE_CHASSIS_ID) >= 0);
assert_se(tlv_packet_read_u8(m, &subtype) >= 0);
switch (subtype) {
case LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS:
*type = LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS;
assert_se(tlv_packet_read_bytes(m, &p, &length) >= 0);
assert_se(memcmp(p, &mac_addr.ether_addr_octet, ETHER_ADDR_LEN) == 0);
break;
default:
assert_not_reached("Unhandled option");
}
assert_se(lldp_tlv_packet_exit_container(m) >= 0);
return 0;
}
static int lldp_parse_port_id_tlv(tlv_packet *m) {
char *str = NULL, *p;
uint16_t length;
uint8_t subtype;
assert_se(lldp_tlv_packet_enter_container(m, LLDP_TYPE_PORT_ID) >= 0);
assert_se(tlv_packet_read_u8(m, &subtype) >= 0);
switch (subtype) {
case LLDP_PORT_SUBTYPE_INTERFACE_NAME:
assert_se(tlv_packet_read_string(m, &str, &length) >= 0);
p = malloc0(length + 1);
strncpy(p, str, length-1);
assert_se(streq(p, TEST_LLDP_PORT) == 1);
break;
default:
assert_not_reached("Unhandled option");
}
assert_se(lldp_tlv_packet_exit_container(m) >= 0);
return 0;
}
static int lldp_parse_system_name_tlv(tlv_packet *m) {
char *str = NULL, *p;
uint16_t length;
assert_se(lldp_tlv_packet_enter_container(m, LLDP_TYPE_SYSTEM_NAME) >= 0);
assert_se(tlv_packet_read_string(m, &str, &length) >= 0);
p = malloc0(length + 1);
strncpy(p, str, length);
assert_se(streq(p, TEST_LLDP_TYPE_SYSTEM_NAME) == 1);
assert_se(lldp_tlv_packet_exit_container(m) >= 0);
return 1;
}
static int lldp_parse_system_desc_tlv(tlv_packet *m) {
char *str = NULL, *p;
uint16_t length;
assert_se(lldp_tlv_packet_enter_container(m, LLDP_TYPE_SYSTEM_DESCRIPTION) >= 0);
assert_se(tlv_packet_read_string(m, &str, &length) >= 0);
p = malloc0(length + 1);
strncpy(p, str, length);
assert_se(streq(p, TEST_LLDP_TYPE_SYSTEM_DESC) == 1);
assert_se(lldp_tlv_packet_exit_container(m) >= 0);
return 0;
}
static int lldp_parse_ttl_tlv(tlv_packet *m) {
uint16_t ttl;
assert_se(lldp_tlv_packet_enter_container(m, LLDP_TYPE_TTL) >= 0);
assert_se(tlv_packet_read_u16(m, &ttl) >= 0);
assert_se(ttl == 170);
assert_se(lldp_tlv_packet_exit_container(m) >= 0);
return 0;
}
static int lldp_parse_tlv_packet(tlv_packet *m, int len) {
uint8_t subtype;
assert_se(tlv_packet_parse_pdu(m, len) >= 0);
assert_se(lldp_parse_chassis_tlv(m, &subtype) >= 0);
assert_se(lldp_parse_port_id_tlv(m) >= 0);
assert_se(lldp_parse_system_name_tlv(m) >= 0);
assert_se(lldp_parse_ttl_tlv(m) >= 0);
assert_se(lldp_parse_system_desc_tlv(m) >= 0);
return 0;
}
int main(int argc, char *argv[]) {
_cleanup_tlv_packet_free_ tlv_packet *tlv = NULL;
/* form a packet */
lldp_build_tlv_packet(&tlv);
/* parse the packet */
tlv_packet_parse_pdu(tlv, tlv->length);
/* verify */
lldp_parse_tlv_packet(tlv, tlv->length);
return 0;
}