1 files changed, 306 insertions, 0 deletions
diff --git a/lib/libpcap/libpcap/pcap-netmap.c b/lib/libpcap/libpcap/pcap-netmap.c
new file mode 100644
index 0000000..b2301a7
--- /dev/null
+++ b/lib/libpcap/libpcap/pcap-netmap.c
@@ -0,0 +1,306 @@
+/*
+ * Copyright (C) 2014 Luigi Rizzo. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <poll.h>
+#include <ctype.h>
+#include <errno.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define NETMAP_WITH_LIBS
+#include <net/netmap_user.h>
+
+#include "pcap-int.h"
+#include "pcap-netmap.h"
+
+#ifndef __FreeBSD__
+  /*
+   * On FreeBSD we use IFF_PPROMISC which is in ifr_flagshigh.
+   * Remap to IFF_PROMISC on other platforms.
+   *
+   * XXX - DragonFly BSD?
+   */
+  #define IFF_PPROMISC	IFF_PROMISC
+#endif /* __FreeBSD__ */
+
+struct pcap_netmap {
+	struct nm_desc *d;	/* pointer returned by nm_open() */
+	pcap_handler cb;	/* callback and argument */
+	u_char *cb_arg;
+	int must_clear_promisc;	/* flag */
+	uint64_t rx_pkts;	/* # of pkts received before the filter */
+};
+
+
+static int
+pcap_netmap_stats(pcap_t *p, struct pcap_stat *ps)
+{
+	struct pcap_netmap *pn = p->priv;
+
+	ps->ps_recv = (u_int)pn->rx_pkts;
+	ps->ps_drop = 0;
+	ps->ps_ifdrop = 0;
+	return 0;
+}
+
+
+static void
+pcap_netmap_filter(u_char *arg, struct pcap_pkthdr *h, const u_char *buf)
+{
+	pcap_t *p = (pcap_t *)arg;
+	struct pcap_netmap *pn = p->priv;
+	const struct bpf_insn *pc = p->fcode.bf_insns;
+
+	++pn->rx_pkts;
+	if (pc == NULL || bpf_filter(pc, buf, h->len, h->caplen))
+		pn->cb(pn->cb_arg, h, buf);
+}
+
+
+static int
+pcap_netmap_dispatch(pcap_t *p, int cnt, pcap_handler cb, u_char *user)
+{
+	int ret;
+	struct pcap_netmap *pn = p->priv;
+	struct nm_desc *d = pn->d;
+	struct pollfd pfd = { .fd = p->fd, .events = POLLIN, .revents = 0 };
+
+	pn->cb = cb;
+	pn->cb_arg = user;
+
+	for (;;) {
+		if (p->break_loop) {
+			p->break_loop = 0;
+			return PCAP_ERROR_BREAK;
+		}
+		/* nm_dispatch won't run forever */
+
+		ret = nm_dispatch((void *)d, cnt, (void *)pcap_netmap_filter, (void *)p);
+		if (ret != 0)
+			break;
+		errno = 0;
+		ret = poll(&pfd, 1, p->opt.timeout);
+	}
+	return ret;
+}
+
+
+/* XXX need to check the NIOCTXSYNC/poll */
+static int
+pcap_netmap_inject(pcap_t *p, const void *buf, size_t size)
+{
+	struct pcap_netmap *pn = p->priv;
+	struct nm_desc *d = pn->d;
+
+	return nm_inject(d, buf, size);
+}
+
+
+static int
+pcap_netmap_ioctl(pcap_t *p, u_long what, uint32_t *if_flags)
+{
+	struct pcap_netmap *pn = p->priv;
+	struct nm_desc *d = pn->d;
+	struct ifreq ifr;
+	int error, fd = d->fd;
+
+#ifdef linux
+	fd = socket(AF_INET, SOCK_DGRAM, 0);
+	if (fd < 0) {
+		fprintf(stderr, "Error: cannot get device control socket.\n");
+		return -1;
+	}
+#endif /* linux */
+	bzero(&ifr, sizeof(ifr));
+	strncpy(ifr.ifr_name, d->req.nr_name, sizeof(ifr.ifr_name));
+	switch (what) {
+	case SIOCSIFFLAGS:
+		/*
+		 * The flags we pass in are 32-bit and unsigned.
+		 *
+		 * On most if not all UN*Xes, ifr_flags is 16-bit and
+		 * signed, and the result of assigning a longer
+		 * unsigned value to a shorter signed value is
+		 * implementation-defined (even if, in practice, it'll
+		 * do what's intended on all platforms we support
+		 * result of assigning a 32-bit unsigned value).
+		 * So we mask out the upper 16 bits.
+		 */
+		ifr.ifr_flags = *if_flags & 0xffff;
+#ifdef __FreeBSD__
+		/*
+		 * In FreeBSD, we need to set the high-order flags,
+		 * as we're using IFF_PPROMISC, which is in those bits.
+		 *
+		 * XXX - DragonFly BSD?
+		 */
+		ifr.ifr_flagshigh = *if_flags >> 16;
+#endif /* __FreeBSD__ */
+		break;
+	}
+	error = ioctl(fd, what, &ifr);
+	if (!error) {
+		switch (what) {
+		case SIOCGIFFLAGS:
+			/*
+			 * The flags we return are 32-bit.
+			 *
+			 * On most if not all UN*Xes, ifr_flags is
+			 * 16-bit and signed, and will get sign-
+			 * extended, so that the upper 16 bits of
+			 * those flags will be forced on.  So we
+			 * mask out the upper 16 bits of the
+			 * sign-extended value.
+			 */
+			*if_flags = ifr.ifr_flags & 0xffff;
+#ifdef __FreeBSD__
+			/*
+			 * In FreeBSD, we need to return the
+			 * high-order flags, as we're using
+			 * IFF_PPROMISC, which is in those bits.
+			 *
+			 * XXX - DragonFly BSD?
+			 */
+			*if_flags |= (ifr.ifr_flagshigh << 16);
+#endif /* __FreeBSD__ */
+		}
+	}
+#ifdef linux
+	close(fd);
+#endif /* linux */
+	return error ? -1 : 0;
+}
+
+
+static void
+pcap_netmap_close(pcap_t *p)
+{
+	struct pcap_netmap *pn = p->priv;
+	struct nm_desc *d = pn->d;
+	uint32_t if_flags = 0;
+
+	if (pn->must_clear_promisc) {
+		pcap_netmap_ioctl(p, SIOCGIFFLAGS, &if_flags); /* fetch flags */
+		if (if_flags & IFF_PPROMISC) {
+			if_flags &= ~IFF_PPROMISC;
+			pcap_netmap_ioctl(p, SIOCSIFFLAGS, &if_flags);
+		}
+	}
+	nm_close(d);
+	pcap_cleanup_live_common(p);
+}
+
+
+static int
+pcap_netmap_activate(pcap_t *p)
+{
+	struct pcap_netmap *pn = p->priv;
+	struct nm_desc *d;
+	uint32_t if_flags = 0;
+
+	d = nm_open(p->opt.device, NULL, 0, NULL);
+	if (d == NULL) {
+		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "netmap open: cannot access %s",
+		    p->opt.device);
+		pcap_cleanup_live_common(p);
+		return (PCAP_ERROR);
+	}
+#if 0
+	fprintf(stderr, "%s device %s priv %p fd %d ports %d..%d\n",
+	    __FUNCTION__, p->opt.device, d, d->fd,
+	    d->first_rx_ring, d->last_rx_ring);
+#endif
+	pn->d = d;
+	p->fd = d->fd;
+
+	/*
+	 * Turn a negative snapshot value (invalid), a snapshot value of
+	 * 0 (unspecified), or a value bigger than the normal maximum
+	 * value, into the maximum allowed value.
+	 *
+	 * If some application really *needs* a bigger snapshot
+	 * length, we should just increase MAXIMUM_SNAPLEN.
+	 */
+	if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
+		p->snapshot = MAXIMUM_SNAPLEN;
+
+	if (p->opt.promisc && !(d->req.nr_ringid & NETMAP_SW_RING)) {
+		pcap_netmap_ioctl(p, SIOCGIFFLAGS, &if_flags); /* fetch flags */
+		if (!(if_flags & IFF_PPROMISC)) {
+			pn->must_clear_promisc = 1;
+			if_flags |= IFF_PPROMISC;
+			pcap_netmap_ioctl(p, SIOCSIFFLAGS, &if_flags);
+		}
+	}
+	p->linktype = DLT_EN10MB;
+	p->selectable_fd = p->fd;
+	p->read_op = pcap_netmap_dispatch;
+	p->inject_op = pcap_netmap_inject;
+	p->setfilter_op = install_bpf_program;
+	p->setdirection_op = NULL;
+	p->set_datalink_op = NULL;
+	p->getnonblock_op = pcap_getnonblock_fd;
+	p->setnonblock_op = pcap_setnonblock_fd;
+	p->stats_op = pcap_netmap_stats;
+	p->cleanup_op = pcap_netmap_close;
+
+	return (0);
+}
+
+
+pcap_t *
+pcap_netmap_create(const char *device, char *ebuf, int *is_ours)
+{
+	pcap_t *p;
+
+	*is_ours = (!strncmp(device, "netmap:", 7) || !strncmp(device, "vale", 4));
+	if (! *is_ours)
+		return NULL;
+	p = pcap_create_common(ebuf, sizeof (struct pcap_netmap));
+	if (p == NULL)
+		return (NULL);
+	p->activate_op = pcap_netmap_activate;
+	return (p);
+}
+
+/*
+ * The "device name" for netmap devices isn't a name for a device, it's
+ * an expression that indicates how the device should be set up, so
+ * there's no way to enumerate them.
+ */
+int
+pcap_netmap_findalldevs(pcap_if_list_t *devlistp _U_, char *err_str _U_)
+{
+	return 0;
+}