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flow.c
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/* */
/*
* Copyright (c) 2020 The University of Queensland
*
* 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 <sys/types.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/resource.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <paths.h>
#include <signal.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <netdb.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/if_ether.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <pcap.h>
#include <event.h>
#include "log.h"
#include "task.h"
#ifndef nitems
#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
#endif
#ifndef ISSET
#define ISSET(_v, _m) ((_v) & (_m))
#endif
static const unsigned int pkt_lens[] = {
64,
128,
256,
512,
1024,
1514, /* XXX 1500 would make more sense for IP */
2048,
4096,
8192,
65535, /* > 8192 */
};
#define NUM_PKT_LENS nitems(pkt_lens)
struct gre_header {
uint16_t gre_flags;
#define GRE_CP 0x8000 /* Checksum Present */
#define GRE_KP 0x2000 /* Key Present */
#define GRE_SP 0x1000 /* Sequence Present */
#define GRE_VERS_MASK 0x0007
#define GRE_VERS_0 0x0000
#define GRE_VERS_1 0x0001
uint16_t gre_proto;
} __packed __aligned(4);
struct gre_h_cksum {
uint16_t gre_cksum;
uint16_t gre_reserved1;
} __packed __aligned(4);
struct gre_h_key {
uint32_t gre_key;
} __packed __aligned(4);
struct esp_header {
uint32_t esp_spi;
uint32_t esp_seq;
} __packed __aligned(4);
struct ah_header {
uint8_t ah_proto;
uint8_t ah_len;
uint16_t ah_reserved;
uint32_t ah_spi;
uint32_t ah_seq;
} __packed __aligned(4);
struct sctp_header {
uint16_t sctp_sport;
uint16_t sctp_dport;
uint32_t sctp_vtag;
uint32_t sctp_cksum;
} __packed __aligned(4);
int rdaemon(int);
union flow_addr {
struct in_addr addr4;
struct in6_addr addr6;
};
struct flow_key {
uint16_t k_sport;
uint16_t k_dport;
int k_vlan;
#define FLOW_VLAN_UNSET -1
uint8_t k_ipv;
uint8_t k_ipproto;
union flow_addr k_saddr;
#define k_saddr4 k_saddr.addr4
#define k_saddr6 k_saddr.addr6
union flow_addr k_daddr;
#define k_daddr4 k_daddr.addr4
#define k_daddr6 k_daddr.addr6
#define k_icmp_type k_sport
#define k_icmp_code k_dport
#define k_gre_flags k_sport
#define k_gre_proto k_dport
uint32_t k_gre_key;
#define k_ipsec_spi k_gre_key
} __aligned(8);
struct flow {
struct flow_key f_key;
uint64_t f_packets;
uint64_t f_bytes;
uint64_t f_frags;
uint64_t f_syns;
uint64_t f_fins;
uint64_t f_rsts;
uint64_t f_rstacks;
uint64_t f_pkt_lens[NUM_PKT_LENS];
uint16_t f_min_tcpwin;
uint16_t f_max_tcpwin;
unsigned int f_min_pktlen;
unsigned int f_max_pktlen;
uint8_t f_min_ttl;
uint8_t f_max_ttl;
RBT_ENTRY(flow) f_entry_tree;
TAILQ_ENTRY(flow) f_entry_list;
};
RBT_HEAD(flow_tree, flow);
TAILQ_HEAD(flow_list, flow);
static inline int
flow_cmp(const struct flow *a, const struct flow *b)
{
const struct flow_key *ka = &a->f_key;
const struct flow_key *kb = &b->f_key;
const unsigned long *la = (const unsigned long *)ka;
const unsigned long *lb = (const unsigned long *)kb;
size_t i;
for (i = 0; i < sizeof(*ka) / sizeof(*la); i++) {
if (la[i] > lb[i])
return (1);
if (la[i] < lb[i])
return (-1);
}
return (0);
}
RBT_PROTOTYPE(flow_tree, flow, f_entry_tree, flow_cmp);
struct timeslice {
unsigned int ts_flow_count;
struct flow_tree ts_flow_tree;
struct flow_list ts_flow_list;
struct timeval ts_begin;
struct timeval ts_end;
struct timeval ts_utime;
struct timeval ts_stime;
uint64_t ts_reads;
uint64_t ts_packets;
uint64_t ts_bytes;
uint64_t ts_mdrop;
uint64_t ts_short_ether;
uint64_t ts_short_vlan;
uint64_t ts_short_ip4;
uint64_t ts_short_ip6;
uint64_t ts_short_ipproto;
uint64_t ts_nonip;
unsigned int ts_pcap_recv;
unsigned int ts_pcap_drop;
unsigned int ts_pcap_ifdrop;
struct task ts_task;
};
struct timeslice *timeslice_alloc(const struct timeval *);
static struct flow *flow_alloc(void);
struct flow_daemon;
struct pkt_source {
const char *ps_name;
struct flow_daemon *ps_d;
pcap_t *ps_ph;
struct pcap_stat ps_pstat;
struct event ps_ev;
TAILQ_ENTRY(pkt_source) ps_entry;
};
TAILQ_HEAD(pkt_sources, pkt_source);
struct flow_daemon {
struct taskq *d_taskq;
struct event d_tick;
struct timeval d_tv;
struct pkt_sources d_pkt_sources;
struct flow *d_flow;
struct timeslice *d_ts;
struct rusage d_rusage[2];
unsigned int d_rusage_gen;
};
static int bpf_maxbufsize(void);
static void flow_tick(int, short, void *);
void pkt_capture(int, short, void *);
static struct addrinfo *
clickhouse_resolve(void);
static int flow_pcap_filter(pcap_t *);
__dead static void
usage(void)
{
extern char *__progname;
fprintf(stderr, "usage: %s [-46d] [-u user] [-h clickhouse_host] "
"[-p clickhouse_port] [-D clickhouse_db] [-U clickhouse_user] "
"[-k clickhouse_key] if0 ...\n", __progname);
exit(1);
}
static int clickhouse_af = PF_UNSPEC;
static const char *clickhouse_host = "localhost";
static const char *clickhouse_port = "8123";
static const char *clickhouse_user = "default";
static const char *clickhouse_database = NULL;
static const char *clickhouse_key = NULL;
static struct addrinfo *clickhouse_res;
static int debug = 0;
static int pagesize;
int
main(int argc, char *argv[])
{
const char *user = "_flow";
char errbuf[PCAP_ERRBUF_SIZE];
const char *errstr;
struct flow_daemon _d = {
.d_tv = { 2, 500000 },
.d_pkt_sources = TAILQ_HEAD_INITIALIZER(_d.d_pkt_sources),
};
struct flow_daemon *d = &_d;
struct pkt_source *ps;
struct timeval now;
struct passwd *pw;
int ch;
int devnull = -1;
int maxbufsize;
maxbufsize = bpf_maxbufsize();
if (maxbufsize == -1)
err(1, "sysctl net.bpf.maxbufsize");
pagesize = sysconf(_SC_PAGESIZE);
if (pagesize == -1)
err(1, "page size");
if (pagesize < 1024) /* in case we're run on a crappy vax OS */
pagesize = 1024;
while ((ch = getopt(argc, argv, "46dD:u:w:h:p:U:k:")) != -1) {
switch (ch) {
case '4':
clickhouse_af = PF_INET;
break;
case '6':
clickhouse_af = PF_INET6;
break;
case 'd':
debug = 1;
break;
case 'D':
clickhouse_database = optarg;
break;
case 'u':
user = optarg;
break;
case 'w':
d->d_tv.tv_sec = strtonum(optarg, 1, 900, &errstr);
if (errstr != NULL)
errx(1, "%s: %s", optarg, errstr);
break;
case 'h':
clickhouse_host = optarg;
break;
case 'p':
clickhouse_port = optarg;
break;
case 'U':
clickhouse_user = optarg;
break;
case 'k':
clickhouse_key = optarg;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc == 0)
usage();
clickhouse_res = clickhouse_resolve();
signal(SIGPIPE, SIG_IGN);
if (geteuid())
lerrx(1, "need root privileges");
pw = getpwnam(user);
if (pw == NULL)
errx(1, "%s: unknown user", user);
if (!debug) {
extern char *__progname;
devnull = open(_PATH_DEVNULL, O_RDWR, 0);
if (devnull == -1)
err(1, "open %s", _PATH_DEVNULL);
logger_syslog(__progname);
}
for (ch = 0; ch < argc; ch++) {
ps = malloc(sizeof(*ps));
if (ps == NULL)
err(1, NULL);
ps->ps_ph = pcap_create(argv[ch], errbuf);
if (ps->ps_ph == NULL)
errx(1, "%s", errbuf);
/* XXX TOCTOU */
if (pcap_set_buffer_size(ps->ps_ph, maxbufsize) != 0)
errx(1, "%s: %s", argv[ch], pcap_geterr(ps->ps_ph));
if (pcap_set_promisc(ps->ps_ph, 1) != 0)
errx(1, "%s", errbuf);
if (pcap_set_snaplen(ps->ps_ph, 256) != 0)
errx(1, "%s", errbuf);
if (pcap_set_timeout(ps->ps_ph, 10) != 0)
errx(1, "%s", errbuf);
if (pcap_activate(ps->ps_ph) != 0)
errx(1, "%s", errbuf);
if (pcap_setnonblock(ps->ps_ph, 1, errbuf) != 0)
errx(1, "%s", errbuf);
if (flow_pcap_filter(ps->ps_ph) != 0)
errx(1, "%s: %s", argv[ch], pcap_geterr(ps->ps_ph));
ps->ps_d = d;
ps->ps_name = argv[ch];
/* fetch a baseline */
memset(&ps->ps_pstat, 0, sizeof(ps->ps_pstat));
if (pcap_stats(ps->ps_ph, &ps->ps_pstat) != 0)
errx(1, "%s %s", ps->ps_name, pcap_geterr(ps->ps_ph));
TAILQ_INSERT_TAIL(&d->d_pkt_sources, ps, ps_entry);
}
if (chroot(pw->pw_dir) == -1)
err(1, "chroot %s", pw->pw_dir);
if (chdir("/") == -1)
err(1, "chdir %s", pw->pw_dir);
if (setgroups(1, &pw->pw_gid) ||
setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
errx(1, "unable to drop privileges");
endpwent();
d->d_taskq = taskq_create("store");
if (d->d_taskq == NULL)
err(1, "taskq");
d->d_flow = flow_alloc();
if (d->d_flow == NULL)
err(1, NULL);
gettimeofday(&now, NULL);
d->d_ts = timeslice_alloc(&now);
if (d->d_ts == NULL)
err(1, NULL);
if (!debug && rdaemon(devnull) == -1)
err(1, "unable to daemonize");
event_init();
evtimer_set(&d->d_tick, flow_tick, d);
evtimer_add(&d->d_tick, &d->d_tv);
TAILQ_FOREACH(ps, &d->d_pkt_sources, ps_entry) {
event_set(&ps->ps_ev, pcap_get_selectable_fd(ps->ps_ph),
EV_READ | EV_PERSIST, pkt_capture, ps);
event_add(&ps->ps_ev, NULL);
}
event_dispatch();
return (0);
}
static int
bpf_maxbufsize(void)
{
int mib[] = { CTL_NET, PF_BPF, NET_BPF_MAXBUFSIZE };
int maxbuf;
size_t maxbufsize = sizeof(maxbuf);
if (sysctl(mib, nitems(mib), &maxbuf, &maxbufsize, NULL, 0) == -1)
return (-1);
return (maxbuf);
}
static int
flow_pcap_filter(pcap_t *p)
{
struct bpf_insn bpf_filter[] = {
BPF_STMT(BPF_RET+BPF_K, pcap_snapshot(p)),
};
struct bpf_program bp = {
.bf_insns = bpf_filter,
.bf_len = nitems(bpf_filter),
};
return (pcap_setfilter(p, &bp));
}
static inline int
flow_gre_key_valid(const struct flow *f)
{
uint16_t v = f->f_key.k_gre_flags;
/* ignore checksum and seq no */
v &= ~htons(GRE_CP|GRE_SP);
return (v == htons(GRE_VERS_0|GRE_KP));
}
static struct addrinfo *
clickhouse_resolve(void)
{
struct addrinfo hints, *res0;
int error;
memset(&hints, 0, sizeof(hints));
hints.ai_family = clickhouse_af;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(clickhouse_host, clickhouse_port, &hints, &res0);
if (error) {
errx(1, "clickhouse host %s port %s resolve: %s",
clickhouse_host, clickhouse_port, gai_strerror(error));
}
return (res0);
}
static int
clickhouse_connect(void)
{
struct addrinfo *res0 = clickhouse_res, *res;
int serrno;
int s;
const char *cause = NULL;
s = -1;
for (res = res0; res; res = res->ai_next) {
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s == -1) {
cause = "socket";
serrno = errno;
continue;
}
if (connect(s, res->ai_addr, res->ai_addrlen) == -1) {
cause = "connect";
serrno = errno;
close(s);
s = -1;
continue;
}
break; /* okay we got one */
}
if (s == -1) {
errno = serrno;
lwarnx("clickhouse host %s port %s %s",
clickhouse_host, clickhouse_port, cause);
return (-1);
}
return (s);
}
struct buf {
char *mem;
size_t len;
size_t off;
};
static inline void
buf_init(struct buf *b)
{
b->off = 0;
}
static void
buf_resize(struct buf *b)
{
b->len += pagesize;
b->mem = realloc(b->mem, b->len);
if (b->mem == NULL)
lerr(1, "buffer resize");
}
static void
buf_reserve(struct buf *b)
{
if ((b->off + pagesize) > b->len)
buf_resize(b);
}
static void
buf_cat(struct buf *b, const char *str)
{
size_t off, rv;
buf_reserve(b);
for (;;) {
rv = strlcpy(b->mem + b->off, str, b->len - b->off);
off = b->off + rv;
if (off < b->len)
break;
buf_resize(b);
}
b->off = off;
}
static void
buf_printf(struct buf *b, const char *fmt, ...)
{
va_list ap;
size_t off;
int rv;
buf_reserve(b);
for (;;) {
va_start(ap, fmt);
rv = vsnprintf(b->mem + b->off, b->len - b->off, fmt, ap);
va_end(ap);
if (rv == -1)
lerr(1, "%s", __func__);
off = b->off + rv;
if (off < b->len)
break;
buf_resize(b);
}
b->off = off;
}
static void
do_clickhouse_sql(const struct buf *sqlbuf, size_t rows, const char *what)
{
static struct buf reqbuf;
int sock;
struct iovec iov[2];
FILE *ss;
char head[256];
buf_init(&reqbuf);
sock = clickhouse_connect();
if (sock == -1) {
/* error was already logged */
return;
}
buf_printf(&reqbuf, "POST / HTTP/1.0\r\n");
buf_printf(&reqbuf, "Host: %s:%s\r\n",
clickhouse_host, clickhouse_port);
if (clickhouse_database != NULL) {
buf_printf(&reqbuf, "X-ClickHouse-Database: %s\r\n",
clickhouse_database);
}
buf_printf(&reqbuf, "X-ClickHouse-User: %s\r\n", clickhouse_user);
if (clickhouse_key != NULL)
buf_printf(&reqbuf, "X-ClickHouse-Key: %s\r\n", clickhouse_key);
buf_printf(&reqbuf, "Content-Length: %zu\r\n", sqlbuf->off);
buf_printf(&reqbuf, "Content-Type: text/sql\r\n");
buf_printf(&reqbuf, "\r\n");
iov[0].iov_base = reqbuf.mem;
iov[0].iov_len = reqbuf.off;
iov[1].iov_base = sqlbuf->mem;
iov[1].iov_len = sqlbuf->off;
writev(sock, iov, nitems(iov)); /* XXX */
ss = fdopen(sock, "r");
if (ss == NULL)
lerr(1, "fdopen");
fgets(head, sizeof (head), ss);
head[strlen(head) - 1] = '\0';
head[strlen(head) - 1] = '\0';
if (strcmp(head, "HTTP/1.0 200 OK") != 0)
lwarnx("clickhouse: error: returned %s", head);
if (debug) {
linfo("clickhouse: POST of %zu %s rows (%zu bytes): %s",
rows, what, sqlbuf->off, head);
}
fclose(ss);
}
static uint32_t
tv_to_msec(const struct timeval *tv)
{
uint32_t msecs;
msecs = tv->tv_sec * 1000;
msecs += tv->tv_usec / 1000;
return (msecs);
}
static void
timeslice_post_flows(struct timeslice *ts, struct buf *sqlbuf,
const char *st, const char *et)
{
char ipbuf[NI_MAXHOST];
struct flow *f, *nf;
const struct flow_key *k;
size_t rows = 0;
const char *join = "";
if (TAILQ_EMPTY(&ts->ts_flow_list))
return;
buf_init(sqlbuf);
buf_cat(sqlbuf, "INSERT INTO flows ("
"begin_at, end_at, "
"vlan, ipv, ipproto, saddr, daddr, sport, dport, gre_key, "
"packets, bytes, frags, "
"syns, fins, rsts, rstacks, mintcpwin, maxtcpwin, "
"minpktlen, maxpktlen, min_ttl, max_ttl, pkt_lens"
")\n" "FORMAT Values\n");
TAILQ_FOREACH_SAFE(f, &ts->ts_flow_list, f_entry_list, nf) {
const char *mjoin = "";
unsigned int i;
k = &f->f_key;
buf_printf(sqlbuf, "%s(%s,%s,", join, st, et);
buf_printf(sqlbuf, "%u,%u,%u,", k->k_vlan, k->k_ipv,
k->k_ipproto);
if (k->k_ipv == 4) {
inet_ntop(PF_INET, &k->k_saddr4, ipbuf, sizeof(ipbuf));
buf_printf(sqlbuf, "IPv4ToIPv6(toIPv4('%s')),", ipbuf);
inet_ntop(PF_INET, &k->k_daddr4, ipbuf, sizeof(ipbuf));
buf_printf(sqlbuf, "IPv4ToIPv6(toIPv4('%s')),", ipbuf);
} else if (k->k_ipv == 6) {
inet_ntop(PF_INET6, &k->k_saddr6, ipbuf, sizeof(ipbuf));
buf_printf(sqlbuf, "toIPv6('%s'),", ipbuf);
inet_ntop(PF_INET6, &k->k_daddr6, ipbuf, sizeof(ipbuf));
buf_printf(sqlbuf, "toIPv6('%s'),", ipbuf);
} else {
buf_printf(sqlbuf, "toIPv6('::'),toIPv6('::'),");
}
buf_printf(sqlbuf,
"%u,%u,%u,%llu,%llu,%llu,%llu,%llu,%llu,%llu,"
"%u,%u,%u,%u,%u,%u,{",
ntohs(k->k_sport), ntohs(k->k_dport), ntohl(k->k_gre_key),
f->f_packets, f->f_bytes, f->f_frags,
f->f_syns, f->f_fins, f->f_rsts, f->f_rstacks,
f->f_min_tcpwin, f->f_max_tcpwin,
f->f_min_pktlen, f->f_max_pktlen,
f->f_min_ttl, f->f_max_ttl);
for (i = 0; i < nitems(f->f_pkt_lens); i++) {
uint64_t pkts = f->f_pkt_lens[i];
if (pkts == 0)
continue;
buf_printf(sqlbuf, "%s%u:%llu", mjoin,
pkt_lens[i], pkts);
mjoin = ",";
}
buf_printf(sqlbuf, "})");
free(f);
join = ",\n";
++rows;
}
buf_printf(sqlbuf, ";\n");
do_clickhouse_sql(sqlbuf, rows, "flow");
}
static void
timeslice_post_flowstats(struct timeslice *ts, struct buf *sqlbuf,
const char *st, const char *et)
{
buf_init(sqlbuf);
buf_cat(sqlbuf, "INSERT INTO flowstats ("
"begin_at, end_at, user_ms, kern_ms, "
"reads, packets, bytes, flows, "
"pcap_recv, pcap_drop, pcap_ifdrop, mdrop"
")\n" "FORMAT Values\n");
buf_printf(sqlbuf, "(%s,%s,", st, et);
buf_printf(sqlbuf, "%u,%u,",
tv_to_msec(&ts->ts_utime), tv_to_msec(&ts->ts_stime));
buf_printf(sqlbuf, "%llu,%llu,%llu,%lu,", ts->ts_reads,
ts->ts_packets, ts->ts_bytes, ts->ts_flow_count);
buf_printf(sqlbuf, "%u,%u,%u,%llu", ts->ts_pcap_recv, ts->ts_pcap_drop,
ts->ts_pcap_ifdrop, ts->ts_mdrop);
buf_cat(sqlbuf, ");\n");
do_clickhouse_sql(sqlbuf, 1, "flowstats");
}
static void
timeslice_post(void *arg)
{
static struct buf sqlbuf;
struct timeslice *ts = arg;
char stbuf[128], etbuf[128];
snprintf(stbuf, sizeof(stbuf), "%lld.%06lld",
(long long)ts->ts_begin.tv_sec, (long long)ts->ts_begin.tv_usec);
snprintf(etbuf, sizeof(etbuf), "%lld.%06lld",
(long long)ts->ts_end.tv_sec, (long long)ts->ts_end.tv_usec);
timeslice_post_flows(ts, &sqlbuf, stbuf, etbuf);
timeslice_post_flowstats(ts, &sqlbuf, stbuf, etbuf);
free(ts);
}
struct timeslice *
timeslice_alloc(const struct timeval *now)
{
struct timeslice *ts;
ts = calloc(1, sizeof(*ts));
if (ts == NULL)
return (NULL);
ts->ts_begin = *now;
ts->ts_flow_count = 0;
RBT_INIT(flow_tree, &ts->ts_flow_tree);
TAILQ_INIT(&ts->ts_flow_list);
task_set(&ts->ts_task, timeslice_post, ts);
return (ts);
}
static struct flow *
flow_alloc(void)
{
struct flow *f;
size_t i;
f = malloc(sizeof(*f));
if (f == NULL)
return (NULL);
for (i = 0; i < nitems(f->f_pkt_lens); i++)
f->f_pkt_lens[i] = 0;
return (f);
}
static void
flow_tick(int nope, short events, void *arg)
{
struct flow_daemon *d = arg;
struct pkt_source *ps;
struct timeslice *ts = d->d_ts;
struct timeslice *nts;
struct timeval now;
unsigned int gen;
struct rusage *oru, *nru;
gettimeofday(&now, NULL);
evtimer_add(&d->d_tick, &d->d_tv);
nts = timeslice_alloc(&now);
if (nts == NULL) {
/* just make this ts wider if we can't get a new one */
return;
}
TAILQ_FOREACH(ps, &d->d_pkt_sources, ps_entry) {
struct pcap_stat pstat;
pkt_capture(pcap_get_selectable_fd(ps->ps_ph), 0, ps);
memset(&pstat, 0, sizeof(pstat)); /* for ifdrop */
if (pcap_stats(ps->ps_ph, &pstat) != 0)
lerrx(1, "%s %s", ps->ps_name, pcap_geterr(ps->ps_ph));
ts->ts_pcap_recv += pstat.ps_recv - ps->ps_pstat.ps_recv;
ts->ts_pcap_drop += pstat.ps_drop - ps->ps_pstat.ps_drop;
ts->ts_pcap_ifdrop += pstat.ps_ifdrop - ps->ps_pstat.ps_ifdrop;
ps->ps_pstat = pstat;
}
gen = d->d_rusage_gen;
oru = &d->d_rusage[gen % nitems(d->d_rusage)];
gen++;
nru = &d->d_rusage[gen % nitems(d->d_rusage)];
d->d_rusage_gen = gen;
if (getrusage(RUSAGE_THREAD, nru) == -1)
lerr(1, "getrusage");
timersub(&nru->ru_utime, &oru->ru_utime, &ts->ts_utime);
timersub(&nru->ru_stime, &oru->ru_stime, &ts->ts_stime);
ts->ts_end = now;
task_add(d->d_taskq, &ts->ts_task);
d->d_ts = nts;
}
static int
pkt_count_tcp(struct timeslice *ts, struct flow *f,
const u_char *buf, u_int buflen)
{
const struct tcphdr *th;
if (buflen < sizeof(*th)) {
ts->ts_short_ipproto++;
return (-1);
}
th = (const struct tcphdr *)buf;
f->f_key.k_sport = th->th_sport;
f->f_key.k_dport = th->th_dport;
if ((th->th_flags & (TH_SYN | TH_ACK)) == TH_SYN)
f->f_syns = 1;
if (th->th_flags & TH_FIN)
f->f_fins = 1;
if (th->th_flags & TH_RST) {
if (th->th_flags & TH_ACK)
f->f_rstacks = 1;
else
f->f_rsts = 1;
}
f->f_min_tcpwin = f->f_max_tcpwin = ntohs(th->th_win);
return (0);
}
static int
pkt_count_udp(struct timeslice *ts, struct flow *f,
const u_char *buf, u_int buflen)
{
const struct udphdr *uh;
if (buflen < sizeof(*uh)) {
ts->ts_short_ipproto++;
return (-1);
}
uh = (const struct udphdr *)buf;
f->f_key.k_sport = uh->uh_sport;
f->f_key.k_dport = uh->uh_dport;
return (0);
}
static int
pkt_count_gre(struct timeslice *ts, struct flow *f,
const u_char *buf, u_int buflen)
{
const struct gre_header *gh;
const struct gre_h_key *gkh;
u_int hlen;
if (buflen < sizeof(*gh)) {
ts->ts_short_ipproto++;
return (-1);
}
gh = (const struct gre_header *)buf;
f->f_key.k_gre_flags = gh->gre_flags;
f->f_key.k_gre_proto = gh->gre_proto;
if (!flow_gre_key_valid(f))
return (0);
hlen = sizeof(*gh);
if (ISSET(f->f_key.k_gre_flags, htons(GRE_CP)))
hlen += sizeof(struct gre_h_cksum);
gkh = (const struct gre_h_key *)buf;
hlen += sizeof(*gkh);
if (buflen < hlen) {
return ts->ts_short_ipproto++;
return (-1);
}
f->f_key.k_gre_key = gkh->gre_key;