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-rw-r--r--src/iface.c62
1 files changed, 43 insertions, 19 deletions
diff --git a/src/iface.c b/src/iface.c
index 49be7d3..be0af40 100644
--- a/src/iface.c
+++ b/src/iface.c
@@ -63,6 +63,29 @@ static const bool multiaf_tun = false;
static const bool multiaf_tun = true;
#endif
+
+/** The actual interface type */
+typedef enum fastd_iface_type {
+ IFACE_TYPE_UNSPEC = 0, /**< Unknown interface */
+ IFACE_TYPE_TAP, /**< TAP interface */
+ IFACE_TYPE_TUN, /**< TUN interface */
+} fastd_iface_type_t;
+
+/** Returns the interface type for the configured mode of operation */
+static inline fastd_iface_type_t get_iface_type(void) {
+ switch (conf.mode) {
+ case MODE_TAP:
+ return IFACE_TYPE_TAP;
+
+ case MODE_TUN:
+ return IFACE_TYPE_TUN;
+
+ default:
+ return IFACE_TYPE_UNSPEC;
+ }
+}
+
+
#ifdef __linux__
/** Opens the TUN/TAP device helper shared by Android and Linux targets */
@@ -76,12 +99,12 @@ static void open_iface_linux(fastd_iface_t *iface, const char *dev_name) {
if (conf.ifname)
strncpy(ifr.ifr_name, conf.ifname, IFNAMSIZ-1);
- switch (conf.mode) {
- case MODE_TAP:
+ switch (get_iface_type()) {
+ case IFACE_TYPE_TAP:
ifr.ifr_flags = IFF_TAP;
break;
- case MODE_TUN:
+ case IFACE_TYPE_TUN:
ifr.ifr_flags = IFF_TUN;
break;
@@ -120,7 +143,7 @@ static void open_iface_linux(fastd_iface_t *iface, const char *dev_name) {
/** Opens the TUN/TAP device */
static void open_iface(fastd_iface_t *iface) {
if (conf.android_integration) {
- if (conf.mode != MODE_TUN)
+ if (get_iface_type() != IFACE_TYPE_TUN)
exit_error("Non root Android supports only TUN mode");
pr_debug("using android TUN fd");
@@ -199,12 +222,12 @@ static void open_iface(fastd_iface_t *iface) {
char ifname[5+IFNAMSIZ] = "/dev/";
const char *type;
- switch (conf.mode) {
- case MODE_TAP:
+ switch (get_iface_type()) {
+ case IFACE_TYPE_TAP:
type = "tap";
break;
- case MODE_TUN:
+ case IFACE_TYPE_TUN:
type = "tun";
break;
@@ -229,12 +252,12 @@ static void open_iface(fastd_iface_t *iface) {
if (!(iface->name = fdevname_r(iface->fd.fd, fastd_alloc(IFNAMSIZ), IFNAMSIZ)))
exit_errno("could not get tun/tap interface name");
- switch (conf.mode) {
- case MODE_TAP:
+ switch (get_iface_type()) {
+ case IFACE_TYPE_TAP:
setup_tap(iface);
break;
- case MODE_TUN:
+ case IFACE_TYPE_TUN:
setup_tun(iface);
break;
@@ -296,12 +319,12 @@ static void open_iface(fastd_iface_t *iface) {
iface->name = fastd_strndup(conf.ifname, IFNAMSIZ-1);
- switch (conf.mode) {
- case MODE_TAP:
+ switch (get_iface_type()) {
+ case IFACE_TYPE_TAP:
setup_tap(iface);
break;
- case MODE_TUN:
+ case IFACE_TYPE_TUN:
setup_tun(iface);
break;
@@ -317,12 +340,12 @@ static void open_iface(fastd_iface_t *iface) {
/** Opens the TUN/TAP device */
static void open_iface(fastd_iface_t *iface) {
const char *devtype;
- switch (conf.mode) {
- case MODE_TAP:
+ switch (get_iface_type()) {
+ case IFACE_TYPE_TAP:
devtype = "tap";
break;
- case MODE_TUN:
+ case IFACE_TYPE_TUN:
devtype = "tun";
break;
@@ -370,7 +393,7 @@ void fastd_iface_handle(fastd_iface_t *iface) {
size_t max_len = fastd_max_payload();
fastd_buffer_t buffer;
- if (multiaf_tun && conf.mode == MODE_TUN)
+ if (multiaf_tun && get_iface_type() == IFACE_TYPE_TUN)
buffer = fastd_buffer_alloc(max_len+4, conf.min_encrypt_head_space+12, conf.min_encrypt_tail_space);
else
buffer = fastd_buffer_alloc(max_len, conf.min_encrypt_head_space, conf.min_encrypt_tail_space);
@@ -381,7 +404,7 @@ void fastd_iface_handle(fastd_iface_t *iface) {
buffer.len = len;
- if (multiaf_tun && conf.mode == MODE_TUN)
+ if (multiaf_tun && get_iface_type() == IFACE_TYPE_TUN)
fastd_buffer_push_head(&buffer, 4);
fastd_send_data(buffer, iface->peer);
@@ -389,7 +412,7 @@ void fastd_iface_handle(fastd_iface_t *iface) {
/** Writes a packet to the TUN/TAP device */
void fastd_iface_write(fastd_iface_t *iface, fastd_buffer_t buffer) {
- if (multiaf_tun && conf.mode == MODE_TUN) {
+ if (multiaf_tun && get_iface_type() == IFACE_TYPE_TUN) {
uint8_t version = *((uint8_t *)buffer.data) >> 4;
uint32_t af;
@@ -415,6 +438,7 @@ void fastd_iface_write(fastd_iface_t *iface, fastd_buffer_t buffer) {
pr_debug2_errno("write");
}
+/** Opens a new TUN/TAP interface, optionally associated with a specific peer */
fastd_iface_t * fastd_iface_open(fastd_peer_t *peer) {
fastd_iface_t *iface = fastd_new(fastd_iface_t);
iface->peer = peer;