Update mud

Required on BSD. Doesn't break anything elsewhere.

src/main.c

@@ -266,7 +266,6 @@ int main (int argc, char **argv)
         { "dev",            &dev,            option_str    },
         { "mtu",            &mtu,            option_long   },
         { "keyfile",        &keyfile,        option_str    },
-        { "multiqueue",     NULL,            option_option },
         { "statefile",      &statefile,      option_str    },
         { "timeout",        &gt.timeout,     option_long   },
         { "time-tolerance", &time_tolerance, option_long   },
@@ -311,6 +310,15 @@ int main (int argc, char **argv)
         return 1;
     }
 
+    int icmp_fd = -1;
+
+    if (v4) {
+        icmp_fd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
+
+        if (icmp_fd==-1)
+            gt_log("couldn't create ICMP socket\n");
+    }
+
     gt.state_fd = state_create(statefile);
 
     if (statefile && gt.state_fd==-1)
@@ -318,7 +326,7 @@ int main (int argc, char **argv)
 
     char *tun_name = NULL;
 
-    int tun_fd = tun_create(dev, &tun_name, option_is_set(opts, "multiqueue"));
+    int tun_fd = tun_create(dev, &tun_name);
 
     if (tun_fd==-1) {
         gt_log("couldn't create tun device\n");
@@ -395,6 +403,9 @@ int main (int argc, char **argv)
     while (!gt.quit) {
         FD_SET(tun_fd, &rfds);
 
+        if (icmp_fd!=-1)
+            FD_SET(icmp_fd, &rfds);
+
         if (mud_can_pull(mud)) {
             FD_SET(mud_fd, &rfds);
         } else {
@@ -415,6 +426,26 @@ int main (int argc, char **argv)
             return 1;
         }
 
+        if (icmp_fd!=-1 && FD_ISSET(icmp_fd, &rfds)) {
+            uint8_t buf[1024];
+            struct sockaddr_storage ss;
+            socklen_t sl = sizeof(ss);
+            ssize_t r = recvfrom(icmp_fd, buf, sizeof(buf), 0, (struct sockaddr *)&ss, &sl);
+            if (r>=8) {
+                struct ip_common ic;
+                if (!ip_get_common(&ic, buf, r) && ic.proto==1) {
+                    unsigned char *data = &buf[ic.hdr_size];
+                    if (data[0]==3) {
+                        int new_mtu = (data[6]<<8)|data[7];
+                        if (new_mtu) {
+                            gt_log("received MTU from ICMP: %i\n", new_mtu);
+                            mud_set_mtu(mud, new_mtu-50);
+                        }
+                    }
+                }
+            }
+        }
+
         if (mud_is_up(mud)) {
             if (!started) {
                 state_send(gt.state_fd, "STARTED", tun_name);

src/tun.c

@@ -11,8 +11,9 @@
 #include <sys/socket.h>
 #include <sys/uio.h>
 
+#include <net/if.h>
+
 #ifdef __linux__
-#include <linux/if.h>
 #include <linux/if_tun.h>
 #endif
 
@@ -28,7 +29,7 @@
 
 #ifdef __APPLE__
 
-static int tun_create_by_id (char *name, size_t size, unsigned id, _unused_ int mq)
+static int tun_create_by_id (char *name, size_t size, unsigned id)
 {
     int fd = socket(PF_SYSTEM, SOCK_DGRAM, SYSPROTO_CONTROL);
 
@@ -63,21 +64,21 @@ static int tun_create_by_id (char *name, size_t size, unsigned id, _unused_ int
     return fd;
 }
 
-static int tun_create_by_name (char *name, size_t size, char *dev_name, int mq)
+static int tun_create_by_name (char *name, size_t size, char *dev_name)
 {
     unsigned id = 0;
 
     if (sscanf(dev_name, "utun%u", &id)!=1)
         return -1;
 
-    return tun_create_by_id(name, size, id, mq);
+    return tun_create_by_id(name, size, id);
 }
 
 #else /* not __APPLE__ */
 
 #ifdef __linux__
 
-static int tun_create_by_name (char *name, size_t size, char *dev_name, int mq)
+static int tun_create_by_name (char *name, size_t size, char *dev_name)
 {
     int fd = open("/dev/net/tun", O_RDWR);
 
@@ -88,12 +89,6 @@ static int tun_create_by_name (char *name, size_t size, char *dev_name, int mq)
         .ifr_flags = IFF_TUN|IFF_NO_PI,
     };
 
-    if (mq) {
-#ifdef IFF_MULTI_QUEUE
-        ifr.ifr_flags |= IFF_MULTI_QUEUE;
-#endif
-    }
-
     str_cpy(ifr.ifr_name, dev_name, IFNAMSIZ-1);
 
     if (ioctl(fd, TUNSETIFF, &ifr)) {
@@ -108,7 +103,7 @@ static int tun_create_by_name (char *name, size_t size, char *dev_name, int mq)
 
 #else /* not __linux__ not __APPLE__ */
 
-static int tun_create_by_name (char *name, size_t size, char *dev_name, _unused_ int mq)
+static int tun_create_by_name (char *name, size_t size, char *dev_name)
 {
     char path[64];
 
@@ -120,32 +115,27 @@ static int tun_create_by_name (char *name, size_t size, char *dev_name, _unused_
 
 #endif /* not __APPLE__ */
 
-static int tun_create_by_id (char *name, size_t size, unsigned id, int mq)
+static int tun_create_by_id (char *name, size_t size, unsigned id)
 {
     char dev_name[64];
 
     snprintf(dev_name, sizeof(dev_name), "tun%u", id);
 
-    return tun_create_by_name(name, size, dev_name, mq);
+    return tun_create_by_name(name, size, dev_name);
 }
 
 #endif
 
-int tun_create (char *dev_name, char **ret_name, int mq)
+int tun_create (char *dev_name, char **ret_name)
 {
     char name[64] = {0};
     int fd = -1;
 
-#ifndef IFF_MULTI_QUEUE
-    if (mq)
-        gt_na("IFF_MULTI_QUEUE");
-#endif
-
     if (str_empty(dev_name)) {
         for (unsigned id=0; id<32 && fd==-1; id++)
-            fd = tun_create_by_id(name, sizeof(name), id, mq);
+            fd = tun_create_by_id(name, sizeof(name), id);
     } else {
-        fd = tun_create_by_name(name, sizeof(name), dev_name, mq);
+        fd = tun_create_by_name(name, sizeof(name), dev_name);
     }
 
     if (fd!=-1 && ret_name)

src/tun.h

@@ -2,7 +2,7 @@
 
 #include <unistd.h>
 
-int     tun_create  (char *, char **, int);
+int     tun_create  (char *, char **);
 ssize_t tun_read    (int, void *, size_t);
 ssize_t tun_write   (int, const void *, size_t);
 int     tun_set_mtu (char *, int);