2 * Copyright (c) 2010 Alexander V. Chernikov <melifaro@ipfw.ru>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include "opt_inet6.h"
33 #include "opt_route.h"
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/counter.h>
37 #include <sys/kernel.h>
38 #include <sys/limits.h>
40 #include <sys/syslog.h>
41 #include <sys/socket.h>
44 #include <net/route.h>
45 #include <net/ethernet.h>
46 #include <netinet/in.h>
47 #include <netinet/in_systm.h>
48 #include <netinet/ip.h>
49 #include <netinet/ip6.h>
50 #include <netinet/tcp.h>
51 #include <netinet/udp.h>
53 #include <netgraph/ng_message.h>
54 #include <netgraph/netgraph.h>
56 #include <netgraph/netflow/netflow.h>
57 #include <netgraph/netflow/ng_netflow.h>
58 #include <netgraph/netflow/netflow_v9.h>
60 MALLOC_DECLARE(M_NETFLOW_GENERAL);
61 MALLOC_DEFINE(M_NETFLOW_GENERAL, "netflow_general", "plog, V9 templates data");
64 * Base V9 templates for L4+ IPv4/IPv6 protocols
66 struct netflow_v9_template _netflow_v9_record_ipv4_tcp[] =
68 { NETFLOW_V9_FIELD_IPV4_SRC_ADDR, 4},
69 { NETFLOW_V9_FIELD_IPV4_DST_ADDR, 4},
70 { NETFLOW_V9_FIELD_IPV4_NEXT_HOP, 4},
71 { NETFLOW_V9_FIELD_INPUT_SNMP, 2},
72 { NETFLOW_V9_FIELD_OUTPUT_SNMP, 2},
73 { NETFLOW_V9_FIELD_IN_PKTS, sizeof(CNTR)},
74 { NETFLOW_V9_FIELD_IN_BYTES, sizeof(CNTR)},
75 { NETFLOW_V9_FIELD_OUT_PKTS, sizeof(CNTR)},
76 { NETFLOW_V9_FIELD_OUT_BYTES, sizeof(CNTR)},
77 { NETFLOW_V9_FIELD_FIRST_SWITCHED, 4},
78 { NETFLOW_V9_FIELD_LAST_SWITCHED, 4},
79 { NETFLOW_V9_FIELD_L4_SRC_PORT, 2},
80 { NETFLOW_V9_FIELD_L4_DST_PORT, 2},
81 { NETFLOW_V9_FIELD_TCP_FLAGS, 1},
82 { NETFLOW_V9_FIELD_PROTOCOL, 1},
83 { NETFLOW_V9_FIELD_TOS, 1},
84 { NETFLOW_V9_FIELD_SRC_AS, 4},
85 { NETFLOW_V9_FIELD_DST_AS, 4},
86 { NETFLOW_V9_FIELD_SRC_MASK, 1},
87 { NETFLOW_V9_FIELD_DST_MASK, 1},
91 struct netflow_v9_template _netflow_v9_record_ipv6_tcp[] =
93 { NETFLOW_V9_FIELD_IPV6_SRC_ADDR, 16},
94 { NETFLOW_V9_FIELD_IPV6_DST_ADDR, 16},
95 { NETFLOW_V9_FIELD_IPV6_NEXT_HOP, 16},
96 { NETFLOW_V9_FIELD_INPUT_SNMP, 2},
97 { NETFLOW_V9_FIELD_OUTPUT_SNMP, 2},
98 { NETFLOW_V9_FIELD_IN_PKTS, sizeof(CNTR)},
99 { NETFLOW_V9_FIELD_IN_BYTES, sizeof(CNTR)},
100 { NETFLOW_V9_FIELD_OUT_PKTS, sizeof(CNTR)},
101 { NETFLOW_V9_FIELD_OUT_BYTES, sizeof(CNTR)},
102 { NETFLOW_V9_FIELD_FIRST_SWITCHED, 4},
103 { NETFLOW_V9_FIELD_LAST_SWITCHED, 4},
104 { NETFLOW_V9_FIELD_L4_SRC_PORT, 2},
105 { NETFLOW_V9_FIELD_L4_DST_PORT, 2},
106 { NETFLOW_V9_FIELD_TCP_FLAGS, 1},
107 { NETFLOW_V9_FIELD_PROTOCOL, 1},
108 { NETFLOW_V9_FIELD_TOS, 1},
109 { NETFLOW_V9_FIELD_SRC_AS, 4},
110 { NETFLOW_V9_FIELD_DST_AS, 4},
111 { NETFLOW_V9_FIELD_SRC_MASK, 1},
112 { NETFLOW_V9_FIELD_DST_MASK, 1},
117 * Pre-compiles flow exporter for all possible FlowSets
118 * so we can add flowset to packet via simple memcpy()
121 generate_v9_templates(priv_p priv)
123 uint16_t *p, *template_fields_cnt;
126 int flowset_size = sizeof(struct netflow_v9_flowset_header) +
127 _NETFLOW_V9_TEMPLATE_SIZE(_netflow_v9_record_ipv4_tcp) + /* netflow_v9_record_ipv4_tcp */
128 _NETFLOW_V9_TEMPLATE_SIZE(_netflow_v9_record_ipv6_tcp); /* netflow_v9_record_ipv6_tcp */
130 priv->v9_flowsets[0] = malloc(flowset_size, M_NETFLOW_GENERAL, M_WAITOK | M_ZERO);
132 if (flowset_size % 4)
133 flowset_size += 4 - (flowset_size % 4); /* Padding to 4-byte boundary */
135 priv->flowsets_count = 1;
136 p = (uint16_t *)priv->v9_flowsets[0];
137 *p++ = 0; /* Flowset ID, 0 is reserved for Template FlowSets */
138 *p++ = htons(flowset_size); /* Total FlowSet length */
141 * Most common TCP/UDP IPv4 template, ID = 256
143 *p++ = htons(NETFLOW_V9_MAX_RESERVED_FLOWSET + NETFLOW_V9_FLOW_V4_L4);
144 template_fields_cnt = p++;
145 for (cnt = 0; _netflow_v9_record_ipv4_tcp[cnt].field_id != 0; cnt++) {
146 *p++ = htons(_netflow_v9_record_ipv4_tcp[cnt].field_id);
147 *p++ = htons(_netflow_v9_record_ipv4_tcp[cnt].field_length);
149 *template_fields_cnt = htons(cnt);
152 * TCP/UDP IPv6 template, ID = 257
154 *p++ = htons(NETFLOW_V9_MAX_RESERVED_FLOWSET + NETFLOW_V9_FLOW_V6_L4);
155 template_fields_cnt = p++;
156 for (cnt = 0; _netflow_v9_record_ipv6_tcp[cnt].field_id != 0; cnt++) {
157 *p++ = htons(_netflow_v9_record_ipv6_tcp[cnt].field_id);
158 *p++ = htons(_netflow_v9_record_ipv6_tcp[cnt].field_length);
160 *template_fields_cnt = htons(cnt);
162 priv->flowset_records[0] = 2;
165 /* Closes current data flowset */
167 close_flowset(struct mbuf *m, struct netflow_v9_packet_opt *t)
172 uint16_t *flowset_length, len;
174 /* Hack to ensure we are not crossing mbuf boundary, length is uint16_t */
175 m_old = m_getptr(m, t->flow_header + offsetof(struct netflow_v9_flowset_header, length), &offset);
176 flowset_length = (uint16_t *)(mtod(m_old, char *) + offset);
178 len = (uint16_t)(m_pktlen(m) - t->flow_header);
179 /* Align on 4-byte boundary (RFC 3954, Clause 5.3) */
181 if (m_append(m, 4 - (len % 4), (void *)&zero) != 1)
182 panic("ng_netflow: m_append() failed!");
184 len += 4 - (len % 4);
187 *flowset_length = htons(len);
191 * Non-static functions called from ng_netflow.c
194 /* We have full datagram in fib data. Send it to export hook. */
196 export9_send(priv_p priv, fib_export_p fe, item_p item, struct netflow_v9_packet_opt *t, int flags)
198 struct mbuf *m = NGI_M(item);
199 struct netflow_v9_export_dgram *dgram = mtod(m,
200 struct netflow_v9_export_dgram *);
201 struct netflow_v9_header *header = &dgram->header;
206 CTR0(KTR_NET, "export9_send(): V9 export packet without tag");
211 /* Close flowset if not closed already */
212 if (m_pktlen(m) != t->flow_header)
215 /* Fill export header. */
216 header->count = t->count;
217 header->sys_uptime = htonl(MILLIUPTIME(time_uptime));
219 header->unix_secs = htonl(ts.tv_sec);
220 header->seq_num = htonl(atomic_fetchadd_32(&fe->flow9_seq, 1));
221 header->count = htons(t->count);
222 header->source_id = htonl(fe->domain_id);
224 if (priv->export9 != NULL)
225 NG_FWD_ITEM_HOOK_FLAGS(error, item, priv->export9, flags);
229 free(t, M_NETFLOW_GENERAL);
236 /* Add V9 record to dgram. */
238 export9_add(item_p item, struct netflow_v9_packet_opt *t, struct flow_entry *fle)
241 struct netflow_v9_flowset_header fsh;
242 struct netflow_v9_record_general rg;
243 struct mbuf *m = NGI_M(item);
245 struct flow_entry_data *fed;
247 struct flow6_entry_data *fed6;
250 CTR0(KTR_NET, "ng_netflow: V9 export packet without tag!");
254 /* Prepare flow record */
255 fed = (struct flow_entry_data *)&fle->f;
257 fed6 = (struct flow6_entry_data *)&fle->f;
259 /* We can use flow_type field since fle6 offset is equal to fle */
260 flow_type = fed->r.flow_type;
263 case NETFLOW_V9_FLOW_V4_L4:
265 /* IPv4 TCP/UDP/[SCTP] */
266 struct netflow_v9_record_ipv4_tcp *rec = &rg.rec.v4_tcp;
268 rec->src_addr = fed->r.r_src.s_addr;
269 rec->dst_addr = fed->r.r_dst.s_addr;
270 rec->next_hop = fed->next_hop.s_addr;
271 rec->i_ifx = htons(fed->fle_i_ifx);
272 rec->o_ifx = htons(fed->fle_o_ifx);
273 rec->i_packets = htonl(fed->packets);
274 rec->i_octets = htonl(fed->bytes);
275 rec->o_packets = htonl(0);
276 rec->o_octets = htonl(0);
277 rec->first = htonl(MILLIUPTIME(fed->first));
278 rec->last = htonl(MILLIUPTIME(fed->last));
279 rec->s_port = fed->r.r_sport;
280 rec->d_port = fed->r.r_dport;
281 rec->flags = fed->tcp_flags;
282 rec->prot = fed->r.r_ip_p;
283 rec->tos = fed->r.r_tos;
284 rec->dst_mask = fed->dst_mask;
285 rec->src_mask = fed->src_mask;
287 /* Not supported fields. */
288 rec->src_as = rec->dst_as = 0;
290 len = sizeof(struct netflow_v9_record_ipv4_tcp);
294 case NETFLOW_V9_FLOW_V6_L4:
296 /* IPv6 TCP/UDP/[SCTP] */
297 struct netflow_v9_record_ipv6_tcp *rec = &rg.rec.v6_tcp;
299 rec->src_addr = fed6->r.src.r_src6;
300 rec->dst_addr = fed6->r.dst.r_dst6;
301 rec->next_hop = fed6->n.next_hop6;
302 rec->i_ifx = htons(fed6->fle_i_ifx);
303 rec->o_ifx = htons(fed6->fle_o_ifx);
304 rec->i_packets = htonl(fed6->packets);
305 rec->i_octets = htonl(fed6->bytes);
306 rec->o_packets = htonl(0);
307 rec->o_octets = htonl(0);
308 rec->first = htonl(MILLIUPTIME(fed6->first));
309 rec->last = htonl(MILLIUPTIME(fed6->last));
310 rec->s_port = fed6->r.r_sport;
311 rec->d_port = fed6->r.r_dport;
312 rec->flags = fed6->tcp_flags;
313 rec->prot = fed6->r.r_ip_p;
314 rec->tos = fed6->r.r_tos;
315 rec->dst_mask = fed6->dst_mask;
316 rec->src_mask = fed6->src_mask;
318 /* Not supported fields. */
319 rec->src_as = rec->dst_as = 0;
321 len = sizeof(struct netflow_v9_record_ipv6_tcp);
327 CTR1(KTR_NET, "export9_add(): Don't know what to do with %d flow type!", flow_type);
332 /* Check if new records has the same template */
333 if (flow_type != t->flow_type) {
334 /* close old flowset */
335 if (t->flow_type != 0)
338 t->flow_type = flow_type;
339 t->flow_header = m_pktlen(m);
341 /* Generate data flowset ID */
342 fsh.id = htons(NETFLOW_V9_MAX_RESERVED_FLOWSET + flow_type);
345 /* m_append should not fail since all data is already allocated */
346 if (m_append(m, sizeof(fsh), (void *)&fsh) != 1)
347 panic("ng_netflow: m_append() failed");
351 if (m_append(m, len, (void *)&rg.rec) != 1)
352 panic("ng_netflow: m_append() failed");
356 if (m_pktlen(m) + sizeof(struct netflow_v9_record_general) + sizeof(struct netflow_v9_flowset_header) >= _NETFLOW_V9_MAX_SIZE(t->mtu))
357 return (1); /* end of datagram */
362 * Detach export datagram from fib instance, if there is any.
363 * If there is no, allocate a new one.
366 get_export9_dgram(priv_p priv, fib_export_p fe, struct netflow_v9_packet_opt **tt)
369 struct netflow_v9_packet_opt *t = NULL;
371 mtx_lock(&fe->export9_mtx);
372 if (fe->exp.item9 != NULL) {
373 item = fe->exp.item9;
374 fe->exp.item9 = NULL;
375 t = fe->exp.item9_opt;
376 fe->exp.item9_opt = NULL;
378 mtx_unlock(&fe->export9_mtx);
381 struct netflow_v9_export_dgram *dgram;
383 uint16_t mtu = priv->mtu;
385 /* Allocate entire packet at once, allowing easy m_append() calls */
386 m = m_getm(NULL, mtu, M_NOWAIT, MT_DATA);
390 t = malloc(sizeof(struct netflow_v9_packet_opt), M_NETFLOW_GENERAL, M_NOWAIT | M_ZERO);
396 item = ng_package_data(m, NG_NOFLAGS);
398 free(t, M_NETFLOW_GENERAL);
402 dgram = mtod(m, struct netflow_v9_export_dgram *);
403 dgram->header.count = 0;
404 dgram->header.version = htons(NETFLOW_V9);
405 /* Set mbuf current data length */
406 m->m_len = m->m_pkthdr.len = sizeof(struct netflow_v9_header);
410 t->flow_header = m->m_len;
413 * Check if we need to insert templates into packet
416 struct netflow_v9_flowset_header *fl;
418 if ((time_uptime >= priv->templ_time + fe->templ_last_ts) ||
419 (fe->sent_packets >= priv->templ_packets + fe->templ_last_pkt)) {
421 fe->templ_last_ts = time_uptime;
422 fe->templ_last_pkt = fe->sent_packets;
424 fl = priv->v9_flowsets[0];
425 m_append(m, ntohs(fl->length), (void *)fl);
426 t->flow_header = m->m_len;
427 t->count += priv->flowset_records[0];
437 * Re-attach incomplete datagram back to fib instance.
438 * If there is already another one, then send incomplete.
441 return_export9_dgram(priv_p priv, fib_export_p fe, item_p item, struct netflow_v9_packet_opt *t, int flags)
444 * It may happen on SMP, that some thread has already
445 * put its item there, in this case we bail out and
446 * send what we have to collector.
448 mtx_lock(&fe->export9_mtx);
449 if (fe->exp.item9 == NULL) {
450 fe->exp.item9 = item;
451 fe->exp.item9_opt = t;
452 mtx_unlock(&fe->export9_mtx);
454 mtx_unlock(&fe->export9_mtx);
455 export9_send(priv, fe, item, t, flags);
459 /* Allocate memory and set up flow cache */
461 ng_netflow_v9_cache_init(priv_p priv)
463 generate_v9_templates(priv);
465 priv->templ_time = NETFLOW_V9_MAX_TIME_TEMPL;
466 priv->templ_packets = NETFLOW_V9_MAX_PACKETS_TEMPL;
467 priv->mtu = BASE_MTU;
470 /* Free all flow cache memory. Called from ng_netflow_cache_flush() */
472 ng_netflow_v9_cache_flush(priv_p priv)
477 for (i = 0; i < priv->flowsets_count; i++)
478 free(priv->v9_flowsets[i], M_NETFLOW_GENERAL);
481 /* Get a snapshot of NetFlow v9 settings */
483 ng_netflow_copyv9info(priv_p priv, struct ng_netflow_v9info *i)
486 i->templ_time = priv->templ_time;
487 i->templ_packets = priv->templ_packets;