--- /dev/null
+/* -*-c-*-
+ *
+ * $Id$
+ *
+ * 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.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#define TUN_INTERNALS
+
+#include "tripe.h"
+
+#ifdef TUN_LINUX
+# include <sys/ioctl.h>
+# include <linux/if.h>
+# include <linux/if_tun.h>
+#endif
+
+/*----- Main code ---------------------------------------------------------*/
+
+#ifdef TUN_LINUX
+
+struct tunnel {
+ const tunnel_ops *ops; /* Pointer to operations */
+ sel_file f; /* Selector for TUN/TAP device */
+ struct peer *p; /* Pointer to my peer */
+ char ifn[IFNAMSIZ]; /* Interface name buffer */
+};
+
+/* --- @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("TUN", "%s", t->ifn, "read-error", "?ERRNO", A_END);
+ return;
+ }
+ IF_TRACING(T_TUNNEL, {
+ trace(T_TUNNEL, "tun-linux: packet arrived");
+ trace_block(T_PACKET, "tun-linux: packet contents", buf_i, n);
+ })
+ buf_init(&b, buf_i, n);
+ p_tun(t->p, &b);
+}
+
+/* --- @t_init@ --- *
+ *
+ * Arguments: ---
+ *
+ * Returns: ---
+ *
+ * Use: Initializes the tunneling system. Maybe this will require
+ * opening file descriptors or something.
+ */
+
+static void t_init(void) { return; }
+
+/* --- @t_create@ --- *
+ *
+ * Arguments: @peer *p@ = pointer to peer block
+ *
+ * Returns: A tunnel block if it worked, or null on failure.
+ *
+ * Use: Initializes a new tunnel.
+ */
+
+static tunnel *t_create(peer *p)
+{
+ int fd;
+ int f;
+ struct ifreq iff;
+ tunnel *t;
+
+ if ((fd = open("/dev/net/tun", O_RDWR)) < 0) {
+ a_warn("TUN", "-", "linux",
+ "open-error", "/dev/net/tun", "?ERRNO",
+ A_END);
+ return (0);
+ }
+ fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
+ memset(&iff, 0, sizeof(iff));
+ iff.ifr_name[0] = 0;
+ iff.ifr_flags = IFF_TUN | IFF_NO_PI;
+ if ((f = ioctl(fd, TUNSETIFF, &iff)) < 0) {
+ a_warn("TUN", "-", "linux", "config-error", "?ERRNO", A_END);
+ close(fd);
+ return (0);
+ }
+ t = CREATE(tunnel);
+ t->ops = &tun_linux;
+ 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, "tun-linux: attached interface %s to peer `%s'",
+ t->ifn, p_name(p)); )
+ return (t);
+}
+
+/* --- @t_ifname@ --- *
+ *
+ * Arguments: @tunnel *t@ = pointer to tunnel block
+ *
+ * Returns: A pointer to the tunnel's interface name.
+ */
+
+static const char *t_ifname(tunnel *t) { return (t->ifn); }
+
+/* --- @t_inject@ --- *
+ *
+ * Arguments: @tunnel *t@ = pointer to tunnel block
+ * @buf *b@ = buffer to send
+ *
+ * Returns: ---
+ *
+ * Use: Injects a packet into the local network stack.
+ */
+
+static void t_inject(tunnel *t, buf *b)
+{
+ IF_TRACING(T_TUNNEL, {
+ trace(T_TUNNEL, "tun-linux: inject decrypted packet");
+ trace_block(T_PACKET, "tunnel: packet contents", BBASE(b), BLEN(b));
+ })
+ write(t->f.fd, BBASE(b), BLEN(b));
+}
+
+/* --- @t_destroy@ --- *
+ *
+ * Arguments: @tunnel *t@ = pointer to tunnel block
+ *
+ * Returns: ---
+ *
+ * Use: Destroys a tunnel.
+ */
+
+static void t_destroy(tunnel *t)
+{
+ sel_rmfile(&t->f);
+ close(t->f.fd);
+ DESTROY(t);
+}
+
+const tunnel_ops tun_linux = {
+ "linux",
+ t_init,
+ t_create,
+ t_ifname,
+ t_inject,
+ t_destroy
+};
+
+#endif
+
+/*----- That's all, folks -------------------------------------------------*/
~mdw / tripe / blobdiff