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Diffstat (limited to 'src/libsystemd-network/lldp-tlv.c')
-rw-r--r--src/libsystemd-network/lldp-tlv.c321
1 files changed, 321 insertions, 0 deletions
diff --git a/src/libsystemd-network/lldp-tlv.c b/src/libsystemd-network/lldp-tlv.c
new file mode 100644
index 0000000000..e43d70d3cf
--- /dev/null
+++ b/src/libsystemd-network/lldp-tlv.c
@@ -0,0 +1,321 @@
+/*-*- 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;
+}
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