+/* -*-c-*-
+ *
+ * $Id: tun-linux.c,v 1.1 2003/04/06 10:25:17 mdw Exp $
+ *
+ * Tunnel interface based on Linux TUN/TAP driver
+ *
+ * (c) 2003 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Trivial IP Encryption (TrIPE).
+ *
+ * TrIPE is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * TrIPE is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with TrIPE; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/*----- Revision history --------------------------------------------------*
+ *
+ * $Log: tun-linux.c,v $
+ * Revision 1.1 2003/04/06 10:25:17 mdw
+ * Support Linux TUN/TAP device. Fix some bugs.
+ *
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include "tripe.h"
+
+#include <sys/ioctl.h>
+
+/*----- Main code ---------------------------------------------------------*/
+
+#if TUN_TYPE != TUN_LINUX
+# error "Tunnel type mismatch: fix the Makefile"
+#endif
+
+/* --- @t_read@ --- *
+ *
+ * Arguments: @int fd@ = file descriptor to read
+ * @unsigned mode@ = what's happened
+ * @void *v@ = pointer to tunnel block
+ *
+ * Returns: ---
+ *
+ * Use: Reads data from the tunnel.
+ */
+
+static void t_read(int fd, unsigned mode, void *v)
+{
+ tunnel *t = v;
+ ssize_t n;
+ buf b;
+
+ n = read(fd, buf_i, sizeof(buf_i));
+ if (n < 0) {
+ a_warn("tunnel read failed (%s): %s", t->ifn, strerror(errno));
+ return;
+ }
+ IF_TRACING(T_TUNNEL, {
+ trace(T_TUNNEL, "tunnel: packet arrived");
+ trace_block(T_PACKET, "tunnel: packet contents", buf_i, n);
+ })
+ buf_init(&b, buf_i, n);
+ p_tun(t->p, &b);
+}
+
+/* --- @tun_init@ --- *
+ *
+ * Arguments: ---
+ *
+ * Returns: ---
+ *
+ * Use: Initializes the tunneling system. Maybe this will require
+ * opening file descriptors or something.
+ */
+
+void tun_init(void)
+{
+ return;
+}
+
+/* --- @tun_create@ --- *
+ *
+ * Arguments: @tunnel *t@ = pointer to tunnel block
+ * @peer *p@ = pointer to peer block
+ *
+ * Returns: Zero if it worked, nonzero on failure.
+ *
+ * Use: Initializes a new tunnel.
+ */
+
+int tun_create(tunnel *t, peer *p)
+{
+ int fd;
+ int f;
+ struct ifreq iff;
+
+ if ((fd = open("/dev/net/tun", O_RDWR)) < 0) {
+ a_warn("open `/dev/net/tun' failed: %s", strerror(errno));
+ return (-1);
+ }
+ fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
+ iff.ifr_name[0] = 0;
+ iff.ifr_flags = IFF_TUN | IFF_NO_PI;
+ if ((f = ioctl(fd, TUNSETIFF, &iff)) < 0) {
+ a_warn("couldn't set configure new TUN/TAP interface: %s",
+ strerror(errno));
+ close(fd);
+ return (-1);
+ }
+ t->p = p;
+ sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t);
+ sel_addfile(&t->f);
+ iff.ifr_name[IFNAMSIZ - 1] = 0;
+ strcpy(t->ifn, iff.ifr_name);
+ T( trace(T_TUNNEL, "tunnel: attached interface %s to peer `%s'",
+ t->ifn, p_name(p)); )
+ return (0);
+}
+
+/* --- @tun_ifname@ --- *
+ *
+ * Arguments: @tunnel *t@ = pointer to tunnel block
+ *
+ * Returns: A pointer to the tunnel's interface name.
+ */
+
+const char *tun_ifname(tunnel *t)
+{
+ return (t->ifn);
+}
+
+/* --- @tun_inject@ --- *
+ *
+ * Arguments: @tunnel *t@ = pointer to tunnel block
+ * @buf *b@ = buffer to send
+ *
+ * Returns: ---
+ *
+ * Use: Injects a packet into the local network stack.
+ */
+
+void tun_inject(tunnel *t, buf *b)
+{
+ IF_TRACING(T_TUNNEL, {
+ trace(T_TUNNEL, "tunnel: inject decrypted packet");
+ trace_block(T_PACKET, "tunnel: packet contents", BBASE(b), BLEN(b));
+ })
+ write(t->f.fd, BBASE(b), BLEN(b));
+}
+
+/* --- @tun_destroy@ --- *
+ *
+ * Arguments: @tunnel *t@ = pointer to tunnel block
+ *
+ * Returns: ---
+ *
+ * Use: Destroys a tunnel.
+ */
+
+void tun_destroy(tunnel *t)
+{
+ sel_rmfile(&t->f);
+ close(t->f.fd);
+}
+
+/*----- That's all, folks -------------------------------------------------*/
~mdw / tripe / commitdiff