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/*
* ipfix.c
*
* Holger Eitzenberger, 2009.
* Ander Juaristi, 2019
*/
/* These forward declarations are needed since ulogd.h doesn't like to be the first */
#include <ulogd/linuxlist.h>
#define __packed __attribute__((packed))
#include "ipfix.h"
#include <ulogd/ulogd.h>
#include <ulogd/common.h>
#include <ulogd/ipfix_protocol.h>
struct ipfix_templ_elem {
uint16_t id;
uint16_t len;
};
struct ipfix_templ {
unsigned int num_templ_elements;
struct ipfix_templ_elem templ_elements[];
};
/* Template fields modeled after vy_ipfix_data */
static const struct ipfix_templ template = {
.num_templ_elements = 10,
.templ_elements = {
{
.id = IPFIX_sourceIPv4Address,
.len = sizeof(uint32_t)
},
{
.id = IPFIX_destinationIPv4Address,
.len = sizeof(uint32_t)
},
{
.id = IPFIX_packetTotalCount,
.len = sizeof(uint32_t)
},
{
.id = IPFIX_octetTotalCount,
.len = sizeof(uint32_t)
},
{
.id = IPFIX_flowStartSeconds,
.len = sizeof(uint32_t)
},
{
.id = IPFIX_flowEndSeconds,
.len = sizeof(uint32_t)
},
{
.id = IPFIX_sourceTransportPort,
.len = sizeof(uint16_t)
},
{
.id = IPFIX_destinationTransportPort,
.len = sizeof(uint16_t)
},
{
.id = IPFIX_protocolIdentifier,
.len = sizeof(uint8_t)
},
{
.id = IPFIX_applicationId,
.len = sizeof(uint32_t)
}
}
};
struct ipfix_msg *ipfix_msg_alloc(size_t len, uint32_t oid, int tid)
{
struct ipfix_msg *msg;
struct ipfix_hdr *hdr;
struct ipfix_templ_hdr *templ_hdr;
struct ipfix_templ_elem *elem;
unsigned int i = 0;
if ((tid > 0 && len < IPFIX_HDRLEN + IPFIX_TEMPL_HDRLEN(template.num_templ_elements) + IPFIX_SET_HDRLEN) ||
(len < IPFIX_HDRLEN + IPFIX_SET_HDRLEN))
return NULL;
msg = malloc(sizeof(struct ipfix_msg) + len);
memset(msg, 0, sizeof(struct ipfix_msg));
msg->tid = tid;
msg->end = msg->data + len;
msg->tail = msg->data + IPFIX_HDRLEN;
if (tid > 0)
msg->tail += IPFIX_TEMPL_HDRLEN(template.num_templ_elements);
/* Initialize message header */
hdr = ipfix_msg_hdr(msg);
memset(hdr, 0, IPFIX_HDRLEN);
hdr->version = htons(IPFIX_VERSION);
hdr->oid = htonl(oid);
if (tid > 0) {
/* Initialize template record header */
templ_hdr = ipfix_msg_templ_hdr(msg);
templ_hdr->sid = htons(2);
templ_hdr->tid = htons(tid);
templ_hdr->len = htons(IPFIX_TEMPL_HDRLEN(template.num_templ_elements));
templ_hdr->cnt = htons(template.num_templ_elements);
while (i < template.num_templ_elements) {
elem = (struct ipfix_templ_elem *) &templ_hdr->data[i * 4];
elem->id = htons(template.templ_elements[i].id);
elem->len = htons(template.templ_elements[i].len);
i++;
}
}
return msg;
}
void ipfix_msg_free(struct ipfix_msg *msg)
{
if (!msg)
return;
if (msg->nrecs > 0)
ulogd_log(ULOGD_DEBUG, "%s: %d flows have been lost\n", __func__,
msg->nrecs);
free(msg);
}
struct ipfix_templ_hdr *ipfix_msg_templ_hdr(const struct ipfix_msg *msg)
{
if (msg->tid > 0)
return (struct ipfix_templ_hdr *) (msg->data + IPFIX_HDRLEN);
return NULL;
}
struct ipfix_hdr *ipfix_msg_hdr(const struct ipfix_msg *msg)
{
return (struct ipfix_hdr *)msg->data;
}
void *ipfix_msg_data(struct ipfix_msg *msg)
{
return msg->data;
}
size_t ipfix_msg_len(const struct ipfix_msg *msg)
{
return msg->tail - msg->data;
}
struct ipfix_set_hdr *ipfix_msg_add_set(struct ipfix_msg *msg, uint16_t sid)
{
struct ipfix_set_hdr *shdr;
if (msg->end - msg->tail < (int) IPFIX_SET_HDRLEN)
return NULL;
shdr = (struct ipfix_set_hdr *)msg->tail;
shdr->id = sid;
shdr->len = IPFIX_SET_HDRLEN;
msg->tail += IPFIX_SET_HDRLEN;
msg->last_set = shdr;
return shdr;
}
struct ipfix_set_hdr *ipfix_msg_get_set(const struct ipfix_msg *msg)
{
return msg->last_set;
}
/**
* Add data record to an IPFIX message. The data is accounted properly.
*
* @return pointer to data or %NULL if not that much space left.
*/
void *ipfix_msg_add_data(struct ipfix_msg *msg, size_t len)
{
void *data;
if (!msg->last_set) {
ulogd_log(ULOGD_FATAL, "msg->last_set is NULL\n");
return NULL;
}
if ((ssize_t) len > msg->end - msg->tail)
return NULL;
data = msg->tail;
msg->tail += len;
msg->nrecs++;
msg->last_set->len += len;
return data;
}
/* check and dump message */
int ipfix_dump_msg(const struct ipfix_msg *msg)
{
const struct ipfix_hdr *hdr = ipfix_msg_hdr(msg);
const struct ipfix_set_hdr *shdr = (struct ipfix_set_hdr *) hdr->data;
if (ntohs(hdr->len) < IPFIX_HDRLEN) {
ulogd_log(ULOGD_FATAL, "Invalid IPFIX message header length\n");
return -1;
}
if (ipfix_msg_len(msg) != IPFIX_HDRLEN + ntohs(shdr->len)) {
ulogd_log(ULOGD_FATAL, "Invalid IPFIX message length\n");
return -1;
}
ulogd_log(ULOGD_DEBUG, "msg: ver=%#x len=%#x t=%#x seq=%#x oid=%d\n",
ntohs(hdr->version), ntohs(hdr->len), htonl(hdr->time),
ntohl(hdr->seqno), ntohl(hdr->oid));
return 0;
}
/* template management */
size_t ipfix_rec_len(uint16_t sid)
{
if (sid != htons(VY_IPFIX_SID)) {
ulogd_log(ULOGD_FATAL, "Invalid SID\n");
return 0;
}
return sizeof(struct vy_ipfix_data);
}
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