307 lines
6.2 KiB
C
307 lines
6.2 KiB
C
#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/param.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include <netinet/in.h>
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#include <sys/mman.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "snf.h"
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#include "pcap-int.h"
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#ifdef SNF_ONLY
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#define snf_create pcap_create
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#define snf_platform_finddevs pcap_platform_finddevs
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#endif
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static int
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snf_set_datalink(pcap_t *p, int dlt)
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{
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p->linktype = dlt;
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return (0);
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}
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static int
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snf_pcap_stats(pcap_t *p, struct pcap_stat *ps)
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{
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struct snf_ring_stats stats;
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int rc;
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if ((rc = snf_ring_getstats(p->md.snf_ring, &stats))) {
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "snf_get_stats: %s",
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pcap_strerror(rc));
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return -1;
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}
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ps->ps_recv = stats.ring_pkt_recv + stats.ring_pkt_overflow;
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ps->ps_drop = stats.ring_pkt_overflow;
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ps->ps_ifdrop = stats.nic_pkt_overflow + stats.nic_pkt_bad;
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return 0;
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}
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static void
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snf_platform_cleanup(pcap_t *p)
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{
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if (p == NULL)
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return;
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snf_ring_close(p->md.snf_ring);
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snf_close(p->md.snf_handle);
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pcap_cleanup_live_common(p);
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}
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static int
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snf_getnonblock(pcap_t *p, char *errbuf)
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{
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return (p->md.snf_timeout == 0);
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}
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static int
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snf_setnonblock(pcap_t *p, int nonblock, char *errbuf)
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{
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if (nonblock)
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p->md.snf_timeout = 0;
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else {
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if (p->md.timeout <= 0)
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p->md.snf_timeout = -1; /* forever */
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else
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p->md.snf_timeout = p->md.timeout;
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}
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return (0);
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}
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#define _NSEC_PER_SEC 1000000000
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static inline
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struct timeval
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snf_timestamp_to_timeval(const int64_t ts_nanosec)
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{
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struct timeval tv;
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int32_t rem;
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if (ts_nanosec == 0)
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return (struct timeval) { 0, 0 };
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tv.tv_sec = ts_nanosec / _NSEC_PER_SEC;
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tv.tv_usec = (ts_nanosec % _NSEC_PER_SEC) / 1000;
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return tv;
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}
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static int
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snf_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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{
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struct pcap_pkthdr hdr;
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int i, flags, err, caplen, n;
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struct snf_recv_req req;
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if (!p || cnt == 0)
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return -1;
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n = 0;
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while (n < cnt || cnt < 0) {
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/*
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* Has "pcap_breakloop()" been called?
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*/
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if (p->break_loop) {
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if (n == 0) {
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p->break_loop = 0;
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return (-2);
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} else {
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return (n);
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}
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}
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err = snf_ring_recv(p->md.snf_ring, p->md.snf_timeout, &req);
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if (err) {
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if (err == EBUSY || err == EAGAIN)
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return (0);
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if (err == EINTR)
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continue;
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if (err != 0) {
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "snf_read: %s",
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pcap_strerror(err));
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return -1;
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}
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}
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caplen = req.length;
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if (caplen > p->snapshot)
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caplen = p->snapshot;
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if ((p->fcode.bf_insns == NULL) ||
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bpf_filter(p->fcode.bf_insns, req.pkt_addr, req.length, caplen)) {
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hdr.ts = snf_timestamp_to_timeval(req.timestamp);
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hdr.caplen = caplen;
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hdr.len = req.length;
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callback(user, &hdr, req.pkt_addr);
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}
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n++;
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}
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return (n);
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}
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static int
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snf_setfilter(pcap_t *p, struct bpf_program *fp)
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{
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if (!p)
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return -1;
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if (!fp) {
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strncpy(p->errbuf, "setfilter: No filter specified",
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sizeof(p->errbuf));
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return -1;
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}
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/* Make our private copy of the filter */
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if (install_bpf_program(p, fp) < 0)
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return -1;
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p->md.use_bpf = 0;
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return (0);
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}
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static int
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snf_inject(pcap_t *p, const void *buf _U_, size_t size _U_)
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{
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strlcpy(p->errbuf, "Sending packets isn't supported with snf",
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PCAP_ERRBUF_SIZE);
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return (-1);
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}
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static int
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snf_activate(pcap_t* p)
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{
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char *device = p->opt.source;
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const char *nr = NULL;
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int err;
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int flags = 0;
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if (device == NULL) {
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
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"device is NULL: %s", pcap_strerror(errno));
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return -1;
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}
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/* In Libpcap, we set pshared by default if NUM_RINGS is set to > 1.
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* Since libpcap isn't thread-safe */
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if ((nr = getenv("SNF_NUM_RINGS")) && *nr && atoi(nr) > 1)
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flags |= SNF_F_PSHARED;
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else
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nr = NULL;
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err = snf_open(p->md.snf_boardnum,
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0, /* let SNF API parse SNF_NUM_RINGS, if set */
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NULL, /* default RSS, or use SNF_RSS_FLAGS env */
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0, /* default to SNF_DATARING_SIZE from env */
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flags, /* may want pshared */
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&p->md.snf_handle);
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if (err != 0) {
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
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"snf_open failed: %s", pcap_strerror(err));
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return -1;
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}
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err = snf_ring_open(p->md.snf_handle, &p->md.snf_ring);
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if (err != 0) {
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
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"snf_ring_open failed: %s", pcap_strerror(err));
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return -1;
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}
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if (p->md.timeout <= 0)
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p->md.snf_timeout = -1;
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else
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p->md.snf_timeout = p->md.timeout;
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err = snf_start(p->md.snf_handle);
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if (err != 0) {
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
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"snf_start failed: %s", pcap_strerror(err));
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return -1;
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}
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/*
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* "select()" and "poll()" don't work on snf descriptors.
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*/
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p->selectable_fd = -1;
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p->linktype = DLT_EN10MB;
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p->read_op = snf_read;
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p->inject_op = snf_inject;
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p->setfilter_op = snf_setfilter;
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p->setdirection_op = NULL; /* Not implemented.*/
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p->set_datalink_op = snf_set_datalink;
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p->getnonblock_op = snf_getnonblock;
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p->setnonblock_op = snf_setnonblock;
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p->stats_op = snf_pcap_stats;
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p->cleanup_op = snf_platform_cleanup;
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p->md.stat.ps_recv = 0;
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p->md.stat.ps_drop = 0;
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p->md.stat.ps_ifdrop = 0;
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return 0;
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}
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int
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snf_platform_finddevs(pcap_if_t **devlistp, char *errbuf)
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{
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/*
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* There are no platform-specific devices since each device
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* exists as a regular Ethernet device.
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*/
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return 0;
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}
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pcap_t *
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snf_create(const char *device, char *ebuf)
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{
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pcap_t *p;
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int boardnum = -1;
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struct snf_ifaddrs *ifaddrs, *ifa;
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size_t devlen;
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if (snf_init(SNF_VERSION_API))
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return NULL;
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/*
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* Match a given interface name to our list of interface names, from
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* which we can obtain the intended board number
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*/
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if (snf_getifaddrs(&ifaddrs) || ifaddrs == NULL)
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return NULL;
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devlen = strlen(device) + 1;
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ifa = ifaddrs;
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while (ifa) {
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if (!strncmp(device, ifa->snf_ifa_name, devlen)) {
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boardnum = ifa->snf_ifa_boardnum;
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break;
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}
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ifa = ifa->snf_ifa_next;
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}
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snf_freeifaddrs(ifaddrs);
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if (ifa == NULL) {
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/*
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* If we can't find the device by name, support the name "snfX"
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* and "snf10gX" where X is the board number.
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*/
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if (sscanf(device, "snf10g%d", &boardnum) != 1 &&
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sscanf(device, "snf%d", &boardnum) != 1)
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return NULL;
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}
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p = pcap_create_common(device, ebuf);
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if (p == NULL)
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return NULL;
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p->activate_op = snf_activate;
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p->md.snf_boardnum = boardnum;
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return p;
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}
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