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authorSusant Sahani <susant@redhat.com>2014-11-23 09:46:36 +0530
committerSusant Sahani <susant@redhat.com>2014-12-19 08:02:45 +0530
commitad1ad5c8e36ea795034fcdac660b15d7c141d55b (patch)
tree6cbd058659041f88cce2d1f9617eb0aba5d6e449 /src/libsystemd-network/lldp-tlv.h
parent266b538958932e6fc27dfce4917336e70e17e29e (diff)
networkd: Introduce Link Layer Discovery Protocol (LLDP)
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.
Diffstat (limited to 'src/libsystemd-network/lldp-tlv.h')
-rw-r--r--src/libsystemd-network/lldp-tlv.h87
1 files changed, 87 insertions, 0 deletions
diff --git a/src/libsystemd-network/lldp-tlv.h b/src/libsystemd-network/lldp-tlv.h
new file mode 100644
index 0000000000..ce3334e115
--- /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);