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flowd.c
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flowd.c
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/*
* Copyright (c) 2004,2005 Damien Miller <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "flowd-common.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <signal.h>
#include <syslog.h>
#include <string.h>
#include <stdio.h>
#include <time.h>
#include <poll.h>
#include "sys-queue.h"
#include "sys-tree.h"
#include "flowd.h"
#include "privsep.h"
#include "netflow.h"
#include "store.h"
#include "store-v2.h"
#include "atomicio.h"
#include "peer.h"
RCSID("$Id$");
/* Dump unknown packet types */
/* #define DEBUG_UNKNOWN */
/* Reams of netflow v.9 verbosity */
/* #define DEBUG_NF9 */
/* Number of errors on Unix Domain log socket before we reopen */
#define LOGSOCK_REOPEN_ERROR_COUNT 128
/* Ratelimit for Unix Domain log socket reopens */
#define LOGSOCK_REOPEN_DELAY 60 /* seconds */
/* Prototype this (can't make it static because it only #ifdef DEBUG_UNKNOWN) */
void dump_packet(const char *tag, const u_int8_t *p, int len);
/* Unix domain socket error detection and reopen counters */
static int logsock_first_error = 0;
static int logsock_num_errors = 0;
/* Flags set by signal handlers */
static sig_atomic_t exit_flag = 0;
static sig_atomic_t reconf_flag = 0;
static sig_atomic_t reopen_flag = 0;
static sig_atomic_t info_flag = 0;
/* Input queue management */
#define INPUT_MAX_PACKET_PER_FD 512
struct flow_packet {
TAILQ_ENTRY(flow_packet) entry;
struct timeval recv_time;
struct xaddr flow_source;
u_int len;
u_int8_t *packet;
};
TAILQ_HEAD(flow_packets, flow_packet);
struct flow_packets input_queue = TAILQ_HEAD_INITIALIZER(input_queue);
/* Allocate a new packet (XXX: make this use a pool of preallocated entries) */
static struct flow_packet
*flow_packet_alloc(void)
{
return (calloc(1, sizeof(struct flow_packet)));
}
/* Deallocate a flow packet (XXX: change to return entry to freelist) */
static void
flow_packet_dealloc(struct flow_packet *f)
{
if (f->packet != NULL)
free(f->packet);
free(f);
}
/* Enqueue a flow packet in the input queue */
static void
flow_packet_enqueue(struct flow_packet *f)
{
TAILQ_INSERT_TAIL(&input_queue, f, entry);
}
/* Pull the first flow packet off the queue */
static struct flow_packet
*flow_packet_dequeue(void)
{
struct flow_packet *f;
if ((f = TAILQ_FIRST(&input_queue)) != NULL)
TAILQ_REMOVE(&input_queue, f, entry);
return (f);
}
/* Output queue management */
#define OUTPUT_INITIAL_QLEN (1024*16)
#define OUTPUT_MAX_QLEN (1024*512) /* Must be 2^x multiple of initial */
u_int8_t *output_queue = NULL;
size_t output_queue_alloc = 0;
size_t output_queue_offset = 0;
/* Enqueue a flow for output, return 0 on success, -1 on queue full */
static int
output_flow_enqueue(u_int8_t *f, size_t len, int verbose)
{
/* Force flush on overflow */
if (output_queue_offset + len > OUTPUT_MAX_QLEN) {
logit(LOG_DEBUG, "%s: output queue full", __func__);
return (-1);
}
if (output_queue == NULL) {
output_queue_alloc = OUTPUT_INITIAL_QLEN;
if ((output_queue = malloc(output_queue_alloc)) == NULL) {
logerrx("Output queue allocation (%zu bytes) failed",
output_queue_alloc);
}
if (verbose) {
logit(LOG_DEBUG, "%s: initial allocation %zu", __func__,
output_queue_alloc);
}
}
while (output_queue_offset + len > output_queue_alloc) {
u_int8_t *tmp_q;
size_t tmp_len = output_queue_alloc << 1;
/* This should never happen if max = initial * 2^x */
if (tmp_len > OUTPUT_MAX_QLEN) {
logit(LOG_DEBUG, "%s: oops, tmp_len (%zu) > "
"OUTPUT_MAX_QLEN (%u)", __func__, tmp_len,
OUTPUT_MAX_QLEN);
return (-1);
}
if ((tmp_q = realloc(output_queue, tmp_len)) == NULL) {
logit(LOG_DEBUG, "%s: realloc of %zu fail", __func__,
tmp_len);
return (-1);
}
if (verbose) {
logit(LOG_DEBUG, "%s: increased output queue "
"from %zuKB to %zuKB", __func__,
output_queue_alloc >> 10, tmp_len >> 10);
}
output_queue = tmp_q;
output_queue_alloc = tmp_len;
}
memcpy(output_queue + output_queue_offset, f, len);
output_queue_offset += len;
if (verbose) {
logit(LOG_DEBUG, "%s: offset %zu alloc %zu", __func__,
output_queue_offset, output_queue_alloc);
}
return (0);
}
static void
output_flow_flush(int log_fd, int verbose)
{
char ebuf[512];
if (log_fd == -1)
return;
if (verbose) {
logit(LOG_DEBUG, "%s: flushing output queue len %zu", __func__,
output_queue_offset);
}
if (output_queue_offset == 0)
return;
if (store_put_buf(log_fd, output_queue, output_queue_offset, ebuf,
sizeof(ebuf)) != STORE_ERR_OK)
logerrx("%s: exiting on %s", __func__, ebuf);
output_queue_offset = 0;
}
/* Signal handlers */
static void
sighand_exit(int signo)
{
exit_flag = signo;
signal(signo, sighand_exit);
}
static void
sighand_reconf(int signo)
{
reconf_flag = 1;
reopen_flag = 1;
signal(signo, sighand_reconf);
}
static void
sighand_reopen(int signo)
{
reopen_flag = 1;
signal(signo, sighand_reopen);
}
static void
sighand_info(int signo)
{
info_flag = 1;
signal(signo, sighand_info);
}
/* Format data to a hex string */
static const char *
data_ntoa(const u_int8_t *p, int len)
{
static char buf[2048];
char tmp[3];
int i;
for (*buf = '\0', i = 0; i < len; i++) {
snprintf(tmp, sizeof(tmp), "%02x%s", p[i], i % 2 ? " " : "");
if (strlcat(buf, tmp, sizeof(buf) - 4) >= sizeof(buf) - 4) {
strlcat(buf, "...", sizeof(buf));
break;
}
}
return (buf);
}
/* Dump a packet */
void
dump_packet(const char *tag, const u_int8_t *p, int len)
{
if (tag == NULL)
logit(LOG_INFO, "packet len %d: %s", len, data_ntoa(p, len));
else {
logit(LOG_INFO, "%s: packet len %d: %s",
tag, len, data_ntoa(p, len));
}
}
static int
start_log(int monitor_fd)
{
int fd;
off_t r;
char ebuf[512];
if ((fd = client_open_log(monitor_fd)) == -1)
logerrx("Logfile open failed, exiting");
/* Don't try to write a v.3 log on the end of a v.2 one */
r = lseek(fd, 0, SEEK_END);
/*
* If there isn't a full legacy header in the file or an error occurs
* (r == -1, e.g. on a FIFO) then don't bother checking for an old
* log header.
*/
if (r < sizeof(struct store_v2_header))
return (fd);
if ((r = lseek(fd, 0, SEEK_SET)) == -1) {
if (errno == ESPIPE)
return fd;
logerr("%s: lseek", __func__);
}
switch (store_v2_check_header(fd, ebuf, sizeof(ebuf))) {
case STORE_ERR_OK:
/* Uh oh - an old flow log is in the way, don't try to write */
logerrx("Error: Cannot append to legacy (version 2) flow log, "
"please move it out of the way and restart flowd");
case STORE_ERR_BAD_MAGIC:
case STORE_ERR_UNSUP_VERSION:
/* Good - the existing flow log is a probably a new one */
if ((r = lseek(fd, 0, SEEK_END)) == -1)
logerr("%s: lseek", __func__);
return (fd);
default:
logerrx("%s: %s", __func__, ebuf);
}
/* NOTREACHED */
return (-1);
}
static int
start_socket(int monitor_fd)
{
int fd;
if ((fd = client_open_socket(monitor_fd)) == -1)
logerrx("Logsock open failed, exiting");
return (fd);
}
static void
process_flow(struct store_flow_complete *flow, struct flowd_config *conf,
int log_fd, int log_socket)
{
char ebuf[512], fbuf[1024];
int flen;
u_int filtres;
/* Another sanity check */
if (flow->src_addr.af != flow->dst_addr.af) {
logit(LOG_WARNING, "%s: flow src(%d)/dst(%d) AF mismatch",
__func__, flow->src_addr.af, flow->dst_addr.af);
return;
}
/* Prepare for writing */
flow->hdr.fields = htonl(flow->hdr.fields);
flow->recv_time.recv_sec = htonl(flow->recv_time.recv_sec);
flow->recv_time.recv_usec = htonl(flow->recv_time.recv_usec);
filtres = filter_flow(flow, &conf->filter_list);
if (conf->opts & FLOWD_OPT_VERBOSE) {
char fmtbuf[1024];
store_format_flow(flow, fmtbuf, sizeof(fmtbuf), 0,
STORE_DISPLAY_ALL, 0);
logit(LOG_DEBUG, "%s: %s flow %s", __func__,
filtres == FF_ACTION_DISCARD ? "DISCARD" : "ACCEPT", fmtbuf);
}
if (filtres == FF_ACTION_DISCARD)
return;
if (store_flow_serialise_masked(flow, conf->store_mask, fbuf,
sizeof(fbuf), &flen, ebuf, sizeof(ebuf)) != STORE_ERR_OK)
logerrx("%s: exiting on %s", __func__, ebuf);
if (log_fd != -1 && output_flow_enqueue(fbuf, flen,
conf->opts & FLOWD_OPT_VERBOSE) == -1) {
output_flow_flush(log_fd, conf->opts & FLOWD_OPT_VERBOSE);
/* Must not fail after flush */
if (output_flow_enqueue(fbuf, flen,
conf->opts & FLOWD_OPT_VERBOSE) == -1)
logerrx("%s: enqueue failed after flush", __func__);
}
/* Track failures to send on log socket so we can reopen it */
if (log_socket != -1 && send(log_socket, fbuf, flen, 0) == -1) {
if (logsock_num_errors > 0 &&
(logsock_num_errors % 10) == 0) {
logit(LOG_WARNING, "log socket send: %s "
"(num errors %d)", strerror(errno),
logsock_num_errors);
}
if (errno != ENOBUFS) {
if (logsock_first_error == 0)
logsock_first_error = time(NULL);
logsock_num_errors++;
}
} else {
/* Start to disregard errors after success */
if (logsock_num_errors > 0)
logsock_num_errors--;
if (logsock_num_errors == 0)
logsock_first_error = 0;
}
/* XXX reopen log file on one failure, exit on multiple */
}
static void
process_netflow_v1(struct flow_packet *fp, struct flowd_config *conf,
struct peer_state *peer, struct peers *peers, int log_fd, int log_socket)
{
struct NF1_HEADER *nf1_hdr = (struct NF1_HEADER *)fp->packet;
struct NF1_FLOW *nf1_flow;
struct store_flow_complete flow;
size_t offset;
u_int i, nflows;
if (fp->len < sizeof(*nf1_hdr)) {
peer->ninvalid++;
logit(LOG_WARNING, "short netflow v.1 packet %d bytes from %s",
fp->len, addr_ntop_buf(&fp->flow_source));
return;
}
nflows = ntohs(nf1_hdr->c.flows);
if (nflows == 0 || nflows > NF1_MAXFLOWS) {
peer->ninvalid++;
logit(LOG_WARNING, "Invalid number of flows (%u) in netflow "
"v.1 packet from %s", nflows,
addr_ntop_buf(&fp->flow_source));
return;
}
if (fp->len != NF1_PACKET_SIZE(nflows)) {
peer->ninvalid++;
logit(LOG_WARNING, "Inconsistent Netflow v.1 packet from %s: "
"len %u expected %zu", addr_ntop_buf(&fp->flow_source),
fp->len, NF1_PACKET_SIZE(nflows));
return;
}
logit(LOG_DEBUG, "Valid netflow v.1 packet %d flows", nflows);
update_peer(peers, peer, nflows, 1);
for (i = 0; i < nflows; i++) {
offset = NF1_PACKET_SIZE(i);
nf1_flow = (struct NF1_FLOW *)(fp->packet + offset);
bzero(&flow, sizeof(flow));
/* NB. These are converted to network byte order later */
flow.hdr.fields = STORE_FIELD_ALL;
/* flow.hdr.tag is set later */
flow.hdr.fields &= ~STORE_FIELD_TAG;
flow.hdr.fields &= ~STORE_FIELD_SRC_ADDR6;
flow.hdr.fields &= ~STORE_FIELD_DST_ADDR6;
flow.hdr.fields &= ~STORE_FIELD_GATEWAY_ADDR6;
flow.hdr.fields &= ~STORE_FIELD_AS_INFO;
flow.hdr.fields &= ~STORE_FIELD_FLOW_ENGINE_INFO;
flow.recv_time.recv_sec = fp->recv_time.tv_sec;
flow.recv_time.recv_usec = fp->recv_time.tv_usec;
flow.pft.tcp_flags = nf1_flow->tcp_flags;
flow.pft.protocol = nf1_flow->protocol;
flow.pft.tos = nf1_flow->tos;
memcpy(&flow.agent_addr, &fp->flow_source,
sizeof(flow.agent_addr));
flow.src_addr.v4.s_addr = nf1_flow->src_ip;
flow.src_addr.af = AF_INET;
flow.dst_addr.v4.s_addr = nf1_flow->dest_ip;
flow.dst_addr.af = AF_INET;
flow.gateway_addr.v4.s_addr = nf1_flow->nexthop_ip;
flow.gateway_addr.af = AF_INET;
flow.ports.src_port = nf1_flow->src_port;
flow.ports.dst_port = nf1_flow->dest_port;
#define NTO64(a) (store_htonll(ntohl(a)))
flow.octets.flow_octets = NTO64(nf1_flow->flow_octets);
flow.packets.flow_packets = NTO64(nf1_flow->flow_packets);
#undef NTO64
flow.ifndx.if_index_in = htonl(ntohs(nf1_flow->if_index_in));
flow.ifndx.if_index_out = htonl(ntohs(nf1_flow->if_index_out));
flow.ainfo.sys_uptime_ms = nf1_hdr->uptime_ms;
flow.ainfo.time_sec = nf1_hdr->time_sec;
flow.ainfo.time_nanosec = nf1_hdr->time_nanosec;
flow.ainfo.netflow_version = nf1_hdr->c.version;
flow.ftimes.flow_start = nf1_flow->flow_start;
flow.ftimes.flow_finish = nf1_flow->flow_finish;
process_flow(&flow, conf, log_fd, log_socket);
}
}
static void
process_netflow_v5(struct flow_packet *fp, struct flowd_config *conf,
struct peer_state *peer, struct peers *peers, int log_fd, int log_socket)
{
struct NF5_HEADER *nf5_hdr = (struct NF5_HEADER *)fp->packet;
struct NF5_FLOW *nf5_flow;
struct store_flow_complete flow;
size_t offset;
u_int i, nflows;
if (fp->len < sizeof(*nf5_hdr)) {
peer->ninvalid++;
logit(LOG_WARNING, "short netflow v.5 packet %d bytes from %s",
fp->len, addr_ntop_buf(&fp->flow_source));
return;
}
nflows = ntohs(nf5_hdr->c.flows);
if (nflows == 0 || nflows > NF5_MAXFLOWS) {
peer->ninvalid++;
logit(LOG_WARNING, "Invalid number of flows (%u) in netflow "
"v.5 packet from %s", nflows,
addr_ntop_buf(&fp->flow_source));
return;
}
if (fp->len != NF5_PACKET_SIZE(nflows)) {
peer->ninvalid++;
logit(LOG_WARNING, "Inconsistent Netflow v.5 packet from %s: "
"len %u expected %zu", addr_ntop_buf(&fp->flow_source),
fp->len, NF5_PACKET_SIZE(nflows));
return;
}
logit(LOG_DEBUG, "Valid netflow v.5 packet %d flows", nflows);
update_peer(peers, peer, nflows, 5);
for (i = 0; i < nflows; i++) {
offset = NF5_PACKET_SIZE(i);
nf5_flow = (struct NF5_FLOW *)(fp->packet + offset);
bzero(&flow, sizeof(flow));
/* NB. These are converted to network byte order later */
flow.hdr.fields = STORE_FIELD_ALL;
/* flow.hdr.tag is set later */
flow.hdr.fields &= ~STORE_FIELD_TAG;
flow.hdr.fields &= ~STORE_FIELD_SRC_ADDR6;
flow.hdr.fields &= ~STORE_FIELD_DST_ADDR6;
flow.hdr.fields &= ~STORE_FIELD_GATEWAY_ADDR6;
flow.recv_time.recv_sec = fp->recv_time.tv_sec;
flow.recv_time.recv_usec = fp->recv_time.tv_usec;
flow.pft.tcp_flags = nf5_flow->tcp_flags;
flow.pft.protocol = nf5_flow->protocol;
flow.pft.tos = nf5_flow->tos;
memcpy(&flow.agent_addr, &fp->flow_source,
sizeof(flow.agent_addr));
flow.src_addr.v4.s_addr = nf5_flow->src_ip;
flow.src_addr.af = AF_INET;
flow.dst_addr.v4.s_addr = nf5_flow->dest_ip;
flow.dst_addr.af = AF_INET;
flow.gateway_addr.v4.s_addr = nf5_flow->nexthop_ip;
flow.gateway_addr.af = AF_INET;
flow.ports.src_port = nf5_flow->src_port;
flow.ports.dst_port = nf5_flow->dest_port;
#define NTO64(a) (store_htonll(ntohl(a)))
flow.octets.flow_octets = NTO64(nf5_flow->flow_octets);
flow.packets.flow_packets = NTO64(nf5_flow->flow_packets);
#undef NTO64
flow.ifndx.if_index_in = htonl(ntohs(nf5_flow->if_index_in));
flow.ifndx.if_index_out = htonl(ntohs(nf5_flow->if_index_out));
flow.ainfo.sys_uptime_ms = nf5_hdr->uptime_ms;
flow.ainfo.time_sec = nf5_hdr->time_sec;
flow.ainfo.time_nanosec = nf5_hdr->time_nanosec;
flow.ainfo.netflow_version = nf5_hdr->c.version;
flow.ftimes.flow_start = nf5_flow->flow_start;
flow.ftimes.flow_finish = nf5_flow->flow_finish;
flow.asinf.src_as = htonl(ntohs(nf5_flow->src_as));
flow.asinf.dst_as = htonl(ntohs(nf5_flow->dest_as));
flow.asinf.src_mask = nf5_flow->src_mask;
flow.asinf.dst_mask = nf5_flow->dst_mask;
flow.finf.engine_type = nf5_hdr->engine_type;
flow.finf.engine_id = nf5_hdr->engine_id;
flow.finf.flow_sequence = nf5_hdr->flow_sequence;
process_flow(&flow, conf, log_fd, log_socket);
}
}
static void
process_netflow_v7(struct flow_packet *fp, struct flowd_config *conf,
struct peer_state *peer, struct peers *peers, int log_fd, int log_socket)
{
struct NF7_HEADER *nf7_hdr = (struct NF7_HEADER *)fp->packet;
struct NF7_FLOW *nf7_flow;
struct store_flow_complete flow;
size_t offset;
u_int i, nflows;
if (fp->len < sizeof(*nf7_hdr)) {
peer->ninvalid++;
logit(LOG_WARNING, "short netflow v.7 packet %d bytes from %s",
fp->len, addr_ntop_buf(&fp->flow_source));
return;
}
nflows = ntohs(nf7_hdr->c.flows);
if (nflows == 0 || nflows > NF7_MAXFLOWS) {
peer->ninvalid++;
logit(LOG_WARNING, "Invalid number of flows (%u) in netflow "
"v.7 packet from %s", nflows,
addr_ntop_buf(&fp->flow_source));
return;
}
if (fp->len != NF7_PACKET_SIZE(nflows)) {
peer->ninvalid++;
logit(LOG_WARNING, "Inconsistent Netflow v.7 packet from %s: "
"len %u expected %zu", addr_ntop_buf(&fp->flow_source),
fp->len, NF7_PACKET_SIZE(nflows));
return;
}
logit(LOG_DEBUG, "Valid netflow v.7 packet %d flows", nflows);
update_peer(peers, peer, nflows, 7);
for (i = 0; i < nflows; i++) {
offset = NF7_PACKET_SIZE(i);
nf7_flow = (struct NF7_FLOW *)(fp->packet + offset);
bzero(&flow, sizeof(flow));
/* NB. These are converted to network byte order later */
flow.hdr.fields = STORE_FIELD_ALL;
/* flow.hdr.tag is set later */
flow.hdr.fields &= ~STORE_FIELD_TAG;
flow.hdr.fields &= ~STORE_FIELD_SRC_ADDR6;
flow.hdr.fields &= ~STORE_FIELD_DST_ADDR6;
flow.hdr.fields &= ~STORE_FIELD_GATEWAY_ADDR6;
/*
* XXX: we can parse the (undocumented) flags1 and flags2
* fields of the packet to disable flow fields not set by
* the Cat5k (e.g. destination-only mls nde mode)
*/
flow.recv_time.recv_sec = fp->recv_time.tv_sec;
flow.recv_time.recv_usec = fp->recv_time.tv_usec;
flow.pft.tcp_flags = nf7_flow->tcp_flags;
flow.pft.protocol = nf7_flow->protocol;
flow.pft.tos = nf7_flow->tos;
memcpy(&flow.agent_addr, &fp->flow_source,
sizeof(flow.agent_addr));
flow.src_addr.v4.s_addr = nf7_flow->src_ip;
flow.src_addr.af = AF_INET;
flow.dst_addr.v4.s_addr = nf7_flow->dest_ip;
flow.dst_addr.af = AF_INET;
flow.gateway_addr.v4.s_addr = nf7_flow->nexthop_ip;
flow.gateway_addr.af = AF_INET;
flow.ports.src_port = nf7_flow->src_port;
flow.ports.dst_port = nf7_flow->dest_port;
#define NTO64(a) (store_htonll(ntohl(a)))
flow.octets.flow_octets = NTO64(nf7_flow->flow_octets);
flow.packets.flow_packets = NTO64(nf7_flow->flow_packets);
#undef NTO64
flow.ifndx.if_index_in = htonl(ntohs(nf7_flow->if_index_in));
flow.ifndx.if_index_out = htonl(ntohs(nf7_flow->if_index_out));
flow.ainfo.sys_uptime_ms = nf7_hdr->uptime_ms;
flow.ainfo.time_sec = nf7_hdr->time_sec;
flow.ainfo.time_nanosec = nf7_hdr->time_nanosec;
flow.ainfo.netflow_version = nf7_hdr->c.version;
flow.ftimes.flow_start = nf7_flow->flow_start;
flow.ftimes.flow_finish = nf7_flow->flow_finish;
flow.asinf.src_as = htonl(ntohs(nf7_flow->src_as));
flow.asinf.dst_as = htonl(ntohs(nf7_flow->dest_as));
flow.asinf.src_mask = nf7_flow->src_mask;
flow.asinf.dst_mask = nf7_flow->dst_mask;
flow.finf.flow_sequence = nf7_hdr->flow_sequence;
process_flow(&flow, conf, log_fd, log_socket);
}
}
static int
nf9_rec_to_flow(struct peer_nf9_record *rec, struct store_flow_complete *flow,
u_int8_t *data)
{
/* XXX: use a table-based interpreter */
switch (rec->type) {
/* Copy an int (possibly shorter than the target) keeping their LSBs aligned */
#define BE_COPY(a) memcpy((u_char*)&a + (sizeof(a) - rec->len), data, rec->len);
#define V9_FIELD(v9_field, store_field, flow_field) \
case v9_field: \
flow->hdr.fields |= STORE_FIELD_##store_field; \
BE_COPY(flow->flow_field); \
break
#define V9_FIELD_ADDR(v9_field, store_field, flow_field, sub, family) \
case v9_field: \
flow->hdr.fields |= STORE_FIELD_##store_field; \
memcpy(&flow->flow_field.v##sub, data, rec->len); \
flow->flow_field.af = AF_##family; \
break
V9_FIELD(NF9_IN_BYTES, OCTETS, octets.flow_octets);
V9_FIELD(NF9_IN_PACKETS, PACKETS, packets.flow_packets);
V9_FIELD(NF9_IN_PROTOCOL, PROTO_FLAGS_TOS, pft.protocol);
V9_FIELD(NF9_SRC_TOS, PROTO_FLAGS_TOS, pft.tos);
V9_FIELD(NF9_TCP_FLAGS, PROTO_FLAGS_TOS, pft.tcp_flags);
V9_FIELD(NF9_L4_SRC_PORT, SRCDST_PORT, ports.src_port);
V9_FIELD(NF9_SRC_MASK, AS_INFO, asinf.src_mask);
V9_FIELD(NF9_INPUT_SNMP, IF_INDICES, ifndx.if_index_in);
V9_FIELD(NF9_L4_DST_PORT, SRCDST_PORT, ports.dst_port);
V9_FIELD(NF9_DST_MASK, AS_INFO, asinf.dst_mask);
V9_FIELD(NF9_OUTPUT_SNMP, IF_INDICES, ifndx.if_index_out);
V9_FIELD(NF9_SRC_AS, AS_INFO, asinf.src_as);
V9_FIELD(NF9_DST_AS, AS_INFO, asinf.dst_as);
V9_FIELD(NF9_LAST_SWITCHED, FLOW_TIMES, ftimes.flow_finish);
V9_FIELD(NF9_FIRST_SWITCHED, FLOW_TIMES, ftimes.flow_start);
V9_FIELD(NF9_IPV6_SRC_MASK, AS_INFO, asinf.src_mask);
V9_FIELD(NF9_IPV6_DST_MASK, AS_INFO, asinf.dst_mask);
V9_FIELD(NF9_ENGINE_TYPE, FLOW_ENGINE_INFO, finf.engine_type);
V9_FIELD(NF9_ENGINE_ID, FLOW_ENGINE_INFO, finf.engine_id);
V9_FIELD_ADDR(NF9_IPV4_SRC_ADDR, SRC_ADDR4, src_addr, 4, INET);
V9_FIELD_ADDR(NF9_IPV4_DST_ADDR, DST_ADDR4, dst_addr, 4, INET);
V9_FIELD_ADDR(NF9_IPV4_NEXT_HOP, GATEWAY_ADDR4, gateway_addr, 4, INET);
V9_FIELD_ADDR(NF9_IPV6_SRC_ADDR, SRC_ADDR6, src_addr, 6, INET6);
V9_FIELD_ADDR(NF9_IPV6_DST_ADDR, DST_ADDR6, dst_addr, 6, INET6);
V9_FIELD_ADDR(NF9_IPV6_NEXT_HOP, GATEWAY_ADDR6, gateway_addr, 6, INET6);
#undef V9_FIELD
#undef V9_FIELD_ADDR
#undef BE_COPY
}
return (0);
}
static int
nf9_check_rec_len(u_int type, u_int len)
{
struct store_flow_complete t;
/* Sanity check */
if (len == 0 || len > 0x4000)
return (0);
/* XXX: use a table-based interpreter */
switch (type) {
#define V9_FIELD_LEN(v9_field, flow_field) \
case v9_field: \
return (len <= sizeof(t.flow_field));
V9_FIELD_LEN(NF9_IN_BYTES, octets.flow_octets);
V9_FIELD_LEN(NF9_IN_PACKETS, packets.flow_packets);
V9_FIELD_LEN(NF9_IN_PROTOCOL, pft.protocol);
V9_FIELD_LEN(NF9_SRC_TOS, pft.tos);
V9_FIELD_LEN(NF9_TCP_FLAGS, pft.tcp_flags);
V9_FIELD_LEN(NF9_L4_SRC_PORT, ports.src_port);
V9_FIELD_LEN(NF9_IPV4_SRC_ADDR, src_addr.v4);
V9_FIELD_LEN(NF9_SRC_MASK, asinf.src_mask);
V9_FIELD_LEN(NF9_INPUT_SNMP, ifndx.if_index_in);
V9_FIELD_LEN(NF9_L4_DST_PORT, ports.dst_port);
V9_FIELD_LEN(NF9_IPV4_DST_ADDR, dst_addr.v4);
V9_FIELD_LEN(NF9_DST_MASK, asinf.src_mask);
V9_FIELD_LEN(NF9_OUTPUT_SNMP, ifndx.if_index_out);
V9_FIELD_LEN(NF9_IPV4_NEXT_HOP, gateway_addr.v4);
V9_FIELD_LEN(NF9_SRC_AS, asinf.src_as);
V9_FIELD_LEN(NF9_DST_AS, asinf.dst_as);
V9_FIELD_LEN(NF9_LAST_SWITCHED, ftimes.flow_finish);
V9_FIELD_LEN(NF9_FIRST_SWITCHED, ftimes.flow_start);
V9_FIELD_LEN(NF9_IPV6_SRC_ADDR, src_addr.v6);
V9_FIELD_LEN(NF9_IPV6_DST_ADDR, dst_addr.v6);
V9_FIELD_LEN(NF9_IPV6_SRC_MASK, asinf.src_mask);
V9_FIELD_LEN(NF9_IPV6_DST_MASK, asinf.dst_mask);
V9_FIELD_LEN(NF9_ENGINE_TYPE, finf.engine_type);
V9_FIELD_LEN(NF9_ENGINE_ID, finf.engine_id);
V9_FIELD_LEN(NF9_IPV6_NEXT_HOP, gateway_addr.v6);
#undef V9_FIELD_LEN
default:
return (1);
}
}
static int
nf9_flowset_to_store(u_int8_t *pkt, size_t len, struct timeval *tv,
struct xaddr *flow_source, struct NF9_HEADER *nf9_hdr,
struct peer_nf9_template *template, u_int32_t source_id,
struct store_flow_complete *flow)
{
u_int offset, i;
if (template->total_len > len)
return (-1);
bzero(flow, sizeof(*flow));
flow->hdr.fields = STORE_FIELD_RECV_TIME | STORE_FIELD_AGENT_INFO |
STORE_FIELD_AGENT_ADDR | STORE_FIELD_FLOW_ENGINE_INFO;
flow->ainfo.sys_uptime_ms = nf9_hdr->uptime_ms;
flow->ainfo.time_sec = nf9_hdr->time_sec;
flow->ainfo.netflow_version = nf9_hdr->c.version;
flow->finf.flow_sequence = nf9_hdr->package_sequence;
flow->finf.source_id = htonl(source_id);
flow->recv_time.recv_sec = tv->tv_sec;
flow->recv_time.recv_usec = tv->tv_usec;
memcpy(&flow->agent_addr, flow_source, sizeof(flow->agent_addr));
offset = 0;
for (i = 0; i < template->num_records; i++) {
#ifdef DEBUG_NF9
logit(LOG_DEBUG, " record %d: type %d len %d: %s",
i, template->records[i].type, template->records[i].len,
data_ntoa(pkt + offset, template->records[i].len));
#endif
nf9_rec_to_flow(&template->records[i], flow, pkt + offset);
offset += template->records[i].len;
}
return (0);
}
static int
process_netflow_v9_template(u_int8_t *pkt, size_t len, struct peer_state *peer,
struct peers *peers, u_int32_t source_id)
{
struct NF9_FLOWSET_HEADER_COMMON *template_header;
struct NF9_TEMPLATE_FLOWSET_HEADER *tmplh;
struct NF9_TEMPLATE_FLOWSET_RECORD *tmplr;
u_int i, count, offset, template_id, total_size;
struct peer_nf9_record *recs;
struct peer_nf9_template *template;
logit(LOG_DEBUG, "netflow v.9 template flowset from source 0x%x "
"(len %zd)", source_id, len);
#ifdef DEBUG_NF9
dump_packet(__func__, pkt, len);
#endif
template_header = (struct NF9_FLOWSET_HEADER_COMMON *)pkt;
if (len < sizeof(*template_header)) {
peer->ninvalid++;
logit(LOG_WARNING, "short netflow v.9 flowset template header "
"%zd bytes from %s/0x%x", len, addr_ntop_buf(&peer->from),
source_id);
/* XXX ratelimit */
return (-1);
}
if (ntohs(template_header->flowset_id) != NF9_TEMPLATE_FLOWSET_ID)
logerrx("Confused template");
logit(LOG_DEBUG, "NetFlow v.9 template set from %s/0x%x with len %zd:",
addr_ntop_buf(&peer->from), source_id, len);
for (offset = sizeof(*template_header); offset < len;) {
tmplh = (struct NF9_TEMPLATE_FLOWSET_HEADER *)(pkt + offset);
template_id = ntohs(tmplh->template_id);
count = ntohs(tmplh->count);
offset += sizeof(*tmplh);
logit(LOG_DEBUG, " Contains template 0x%08x/0x%04x with "
"%d records (offset %d):", source_id, template_id,
count, offset);
if ((recs = calloc(count, sizeof(*recs))) == NULL)
logerrx("%s: calloc failed (num %d)", __func__, count);
total_size = 0;
for (i = 0; i < count; i++) {
if (offset >= len) {
free(recs);
peer->ninvalid++;
logit(LOG_WARNING, "short netflow v.9 flowset "
"template 0x%08x/0x%04x %zd bytes from %s",
source_id, template_id, len,
addr_ntop_buf(&peer->from));
/* XXX ratelimit */
return (-1);
}
tmplr = (struct NF9_TEMPLATE_FLOWSET_RECORD *)
(pkt + offset);
recs[i].type = ntohs(tmplr->type);
recs[i].len = ntohs(tmplr->length);
offset += sizeof(*tmplr);
#ifdef DEBUG_NF9
logit(LOG_DEBUG, " record %d: type %d len %d",
i, recs[i].type, recs[i].len);
#endif
total_size += recs[i].len;
if (total_size > peers->max_template_len) {
free(recs);
peer->ninvalid++;
logit(LOG_WARNING, "netflow v.9 flowset "
"template 0x%08x/0x%04x from %s too large "
"len %d > max %d", source_id, template_id,
addr_ntop_buf(&peer->from), total_size,
peers->max_template_len);
/* XXX ratelimit */
return (-1);
}
if (!nf9_check_rec_len(recs[i].type, recs[i].len)) {
peer->ninvalid++;
logit(LOG_WARNING, "Invalid field length in "
"netflow v.9 flowset template %d from "
"%s/0x%08x type %d len %d", template_id,
addr_ntop_buf(&peer->from), source_id,
recs[i].type, recs[i].len);
free(recs);
/* XXX ratelimit */
return (-1);
}
/* XXX kill existing template on error! */
}
template = peer_nf9_find_template(peer, source_id, template_id);
if (template == NULL) {
template = peer_nf9_new_template(peer, peers,
source_id, template_id);
}
if (template->records != NULL)
free(template->records);
template->records = recs;
template->num_records = i;
template->total_len = total_size;
}
return (0);
}
static int
process_netflow_v9_data(u_int8_t *pkt, size_t len, struct timeval *tv,
struct peer_state *peer, u_int32_t source_id, struct NF9_HEADER *nf9_hdr,
struct flowd_config *conf, int log_fd, int log_socket, u_int *num_flows)
{
struct store_flow_complete *flows;
struct peer_nf9_template *template;
struct NF9_DATA_FLOWSET_HEADER *dath;
u_int flowset_id, i, offset, num_flowsets;
*num_flows = 0;
logit(LOG_DEBUG, "netflow v.9 data flowset (len %zd) source 0x%08x",
len, source_id);
dath = (struct NF9_DATA_FLOWSET_HEADER *)pkt;
if (len < sizeof(*dath)) {
peer->ninvalid++;
logit(LOG_WARNING, "short netflow v.9 data flowset header "
"%zd bytes from %s", len, addr_ntop_buf(&peer->from));
/* XXX ratelimit */
return (-1);
}
flowset_id = ntohs(dath->c.flowset_id);
if ((template = peer_nf9_find_template(peer, source_id,
flowset_id)) == NULL) {
peer->no_template++;
logit(LOG_DEBUG, "netflow v.9 data flowset without template "
"%s/0x%08x/0x%04x", addr_ntop_buf(&peer->from), source_id,
flowset_id);
return (0);
}
if (template->records == NULL)
logerrx("%s: template->records == NULL", __func__);
offset = sizeof(*dath);
num_flowsets = (len - offset) / template->total_len;
if (num_flowsets == 0 || num_flowsets > 0x4000) {
logit(LOG_WARNING, "invalid netflow v.9 data flowset "
"from %s: strange number of flows %d",
addr_ntop_buf(&peer->from), num_flowsets);
return (-1);
}
if ((flows = calloc(num_flowsets, sizeof(*flows))) == NULL)
logerrx("%s: calloc failed (num %d)", __func__, num_flowsets);
for (i = 0; i < num_flowsets; i++) {
if (nf9_flowset_to_store(pkt + offset, template->total_len, tv,
&peer->from, nf9_hdr, template, source_id,
&flows[i]) == -1) {
peer->ninvalid++;
free(flows);
logit(LOG_WARNING, "invalid netflow v.9 data flowset "
"from %s", addr_ntop_buf(&peer->from));
/* XXX ratelimit */
return (-1);
}
offset += template->total_len;
}
*num_flows = i;