+++ /dev/null
-/*-*- 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 = NULL;
- 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 = NULL;
- 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 = NULL;
- 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 = NULL;
- 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;
-}
~ianmdlvl / elogind.git / blobdiff