[systemd-devel] [PATCH 1/2] networkd: Introduce Link Layer Discovery Protocol (LLDP)
Tom Gundersen
teg at jklm.no
Fri Dec 19 15:10:17 PST 2014
I have now mergede these patches, with some minor cleanups on top.
Susant, please yell if I broke something when fixing the headers.
Cheers,
Tom
On Sun, Nov 23, 2014 at 5:45 AM, Susant Sahani <susant at redhat.com> wrote:
> 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.
> ---
> Makefile.am | 27 +-
> src/libsystemd-network/lldp-internal.c | 421 ++++++++++++++++++++++++++++
> src/libsystemd-network/lldp-internal.h | 94 +++++++
> src/libsystemd-network/lldp-network.c | 111 ++++++++
> src/libsystemd-network/lldp-network.h | 28 ++
> src/libsystemd-network/lldp-port.c | 116 ++++++++
> src/libsystemd-network/lldp-port.h | 61 ++++
> src/libsystemd-network/lldp-tlv.c | 319 +++++++++++++++++++++
> src/libsystemd-network/lldp-tlv.h | 87 ++++++
> src/libsystemd-network/lldp.h | 115 ++++++++
> src/libsystemd-network/sd-lldp.c | 495 +++++++++++++++++++++++++++++++++
> src/libsystemd-network/sd-lldp.h | 51 ++++
> src/libsystemd-network/test-lldp.c | 233 ++++++++++++++++
> 13 files changed, 2156 insertions(+), 2 deletions(-)
> create mode 100644 src/libsystemd-network/lldp-internal.c
> create mode 100644 src/libsystemd-network/lldp-internal.h
> create mode 100644 src/libsystemd-network/lldp-network.c
> create mode 100644 src/libsystemd-network/lldp-network.h
> create mode 100644 src/libsystemd-network/lldp-port.c
> create mode 100644 src/libsystemd-network/lldp-port.h
> create mode 100644 src/libsystemd-network/lldp-tlv.c
> create mode 100644 src/libsystemd-network/lldp-tlv.h
> create mode 100644 src/libsystemd-network/lldp.h
> create mode 100644 src/libsystemd-network/sd-lldp.c
> create mode 100644 src/libsystemd-network/sd-lldp.h
> create mode 100644 src/libsystemd-network/test-lldp.c
>
> diff --git a/Makefile.am b/Makefile.am
> index 3f9f3fa..dc18a6a 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -2948,7 +2948,18 @@ 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 \
> @@ -3027,13 +3038,25 @@ 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
> diff --git a/src/libsystemd-network/lldp-internal.c b/src/libsystemd-network/lldp-internal.c
> new file mode 100644
> index 0000000..1db7919
> --- /dev/null
> +++ b/src/libsystemd-network/lldp-internal.c
> @@ -0,0 +1,421 @@
> +/*-*- 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;
> + uint16_t ttl, length;
> + uint8_t subtype, *data;
> + 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 out;
> +
> + r = lldp_read_ttl(tlv, &ttl);
> + if (r < 0)
> + goto out;
> +
> + /* 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 out;
> + }
> +
> + /* 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 out;
> + }
> +
> + r = lldp_chassis_new(tlv, by_expiry, neighbour_mib, &c);
> + if (r < 0)
> + goto out;
> +
> + r = hashmap_put(neighbour_mib, &c->chassis_id, c);
> + if (r < 0)
> + goto out;
> + } 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);
> + goto out;
> + }
> +
> + /* if we already have this port just update it */
> + r = lldp_mib_update_objects(c, tlv);
> + if (r >= 0)
> + return 0;
> +
> + /* 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));
> + goto out;
> + }
> + }
> +
> + /* This is a new port */
> + r = lldp_neighbour_port_new(c, tlv, &p);
> + if (r < 0)
> + return r;
> +
> + r = prioq_put(c->by_expiry, p, &p->prioq_idx);
> + if (r < 0)
> + return r;
> +
> + /* Attach new port to chassis */
> + LIST_PREPEND(port, c->ports, p);
> + REFCNT_INC(c->n_ref);
> +
> + p = NULL;
> + c = NULL;
> +
> + return 0;
> + out:
> + 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;
> +}
> diff --git a/src/libsystemd-network/lldp-internal.h b/src/libsystemd-network/lldp-internal.h
> new file mode 100644
> index 0000000..c289ed8
> --- /dev/null
> +++ b/src/libsystemd-network/lldp-internal.h
> @@ -0,0 +1,94 @@
> +/*-*- 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_meta(LOG_DEBUG, __FILE__, __LINE__, __func__, "LLDP: " fmt, ##__VA_ARGS__)
> diff --git a/src/libsystemd-network/lldp-network.c b/src/libsystemd-network/lldp-network.c
> new file mode 100644
> index 0000000..cfab911
> --- /dev/null
> +++ b/src/libsystemd-network/lldp-network.c
> @@ -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);
> +}
> diff --git a/src/libsystemd-network/lldp-network.h b/src/libsystemd-network/lldp-network.h
> new file mode 100644
> index 0000000..b7f8d3b
> --- /dev/null
> +++ b/src/libsystemd-network/lldp-network.h
> @@ -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);
> diff --git a/src/libsystemd-network/lldp-port.c b/src/libsystemd-network/lldp-port.c
> new file mode 100644
> index 0000000..12b72ee
> --- /dev/null
> +++ b/src/libsystemd-network/lldp-port.c
> @@ -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;
> +}
> diff --git a/src/libsystemd-network/lldp-port.h b/src/libsystemd-network/lldp-port.h
> new file mode 100644
> index 0000000..1b1ae04
> --- /dev/null
> +++ b/src/libsystemd-network/lldp-port.h
> @@ -0,0 +1,61 @@
> +/*-*- 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);
> diff --git a/src/libsystemd-network/lldp-tlv.c b/src/libsystemd-network/lldp-tlv.c
> new file mode 100644
> index 0000000..a9b5caf
> --- /dev/null
> +++ b/src/libsystemd-network/lldp-tlv.c
> @@ -0,0 +1,319 @@
> +/*-*- 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) {
> +
> + assert(m);
> +
> + 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;
> +
> + assert(m);
> +
> + 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(§ion);
> + 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;
> +}
> diff --git a/src/libsystemd-network/lldp-tlv.h b/src/libsystemd-network/lldp-tlv.h
> new file mode 100644
> index 0000000..ce3334e
> --- /dev/null
> +++ b/src/libsystemd-network/lldp-tlv.h
> @@ -0,0 +1,87 @@
> +/*-*- 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);
> diff --git a/src/libsystemd-network/lldp.h b/src/libsystemd-network/lldp.h
> new file mode 100644
> index 0000000..5e4b283
> --- /dev/null
> +++ b/src/libsystemd-network/lldp.h
> @@ -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;
> diff --git a/src/libsystemd-network/sd-lldp.c b/src/libsystemd-network/sd-lldp.c
> new file mode 100644
> index 0000000..1b7b86b
> --- /dev/null
> +++ b/src/libsystemd-network/sd-lldp.c
> @@ -0,0 +1,495 @@
> +/*-*- 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));
> +
> + tlv_packet_free(tlv);
> +
> + 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;
> +}
> diff --git a/src/libsystemd-network/sd-lldp.h b/src/libsystemd-network/sd-lldp.h
> new file mode 100644
> index 0000000..95d802d
> --- /dev/null
> +++ b/src/libsystemd-network/sd-lldp.h
> @@ -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);
> diff --git a/src/libsystemd-network/test-lldp.c b/src/libsystemd-network/test-lldp.c
> new file mode 100644
> index 0000000..e9d5d7b
> --- /dev/null
> +++ b/src/libsystemd-network/test-lldp.c
> @@ -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(ðer, 0, sizeof(ether));
> + memcpy(ðer.ether_dhost, lldp_dst, ETHER_ADDR_LEN);
> + memcpy(ðer.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, ðer, 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;
> +}
> --
> 2.1.0
>
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