Add set option kxtimeout

Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>

src/bind.c

@@ -6,8 +6,8 @@
 #include "tun.h"
 
 #include <fcntl.h>
-#include <netinet/in.h>
 #include <stdio.h>
+#include <sys/select.h>
 
 #include "../argz/argz.h"
 #include "../mud/mud.h"
@@ -16,8 +16,6 @@
 #define O_CLOEXEC 0
 #endif
 
-#define GT_MTU(X) ((X)-28)
-
 static void
 fd_set_nonblock(int fd)
 {
@@ -90,13 +88,19 @@ gt_setup_secretkey(struct mud *mud, const char *keyfile)
 static size_t
 gt_setup_mtu(struct mud *mud, const char *tun_name)
 {
+    static size_t oldmtu = 0;
     size_t mtu = mud_get_mtu(mud);
 
+    if (mtu == oldmtu)
+        return mtu;
+
     gt_log("setup MTU to %zu on interface %s\n", mtu, tun_name);
 
     if (iface_set_mtu(tun_name, mtu) == -1)
         perror("tun_set_mtu");
 
+    oldmtu = mtu;
+
     return mtu;
 }
 
@@ -110,12 +114,7 @@ gt_bind(int argc, char **argv)
     const char *dev = NULL;
     const char *keyfile = NULL;
     size_t bufsize = 64 * 1024 * 1024;
-    size_t mtu = 1500;
-
-    struct argz mtuz[] = {
-        {"auto", NULL, NULL, argz_option},
-        {NULL, "BYTES", &mtu, argz_bytes},
-        {NULL}};
+    size_t mtu = 1330;
 
     struct argz toz[] = {
         {NULL, "IPADDR", &peer_addr, argz_addr},
@@ -127,7 +126,7 @@ gt_bind(int argc, char **argv)
         {NULL, "PORT", &bind_port, argz_ushort},
         {"to", NULL, &toz, argz_option},
         {"dev", "NAME", &dev, argz_str},
-        {"mtu", NULL, &mtuz, argz_option},
+        {"mtu", "BYTES", &mtu, argz_bytes},
         {"keyfile", "FILE", &keyfile, argz_str},
         {"chacha", NULL, NULL, argz_option},
         {"persist", NULL, NULL, argz_option},
@@ -147,19 +146,9 @@ gt_bind(int argc, char **argv)
         return 1;
     }
 
-    int mtu_auto = argz_is_set(mtuz, "auto");
     int chacha = argz_is_set(bindz, "chacha");
     int persist = argz_is_set(bindz, "persist");
 
-    int icmp_fd = -1;
-
-    if (mtu_auto && (peer_addr.ss_family == AF_INET)) {
-        icmp_fd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
-
-        if (icmp_fd == -1)
-            gt_log("couldn't create ICMP socket\n");
-    }
-
     struct mud *mud = mud_create((struct sockaddr *)&bind_addr);
 
     if (!mud) {
@@ -182,8 +171,6 @@ gt_bind(int argc, char **argv)
         chacha = 1;
     }
 
-    mud_set_mtu(mud, GT_MTU(mtu));
-
     char tun_name[64];
     int tun_fd = tun_create(tun_name, sizeof(tun_name) - 1, dev);
 
@@ -192,6 +179,9 @@ gt_bind(int argc, char **argv)
         return 1;
     }
 
+    mud_set_mtu(mud, mtu);
+    mtu = gt_setup_mtu(mud, tun_name);
+
     if (tun_set_persist(tun_fd, persist) == -1)
         perror("tun_set_persist");
 
@@ -202,9 +192,7 @@ gt_bind(int argc, char **argv)
         }
     }
 
-    mtu = gt_setup_mtu(mud, tun_name);
-
-    int ctl_fd = ctl_create("/run/" PACKAGE_NAME, tun_name);
+    int ctl_fd = ctl_create(GT_RUNDIR, tun_name);
 
     if (ctl_fd == -1) {
         perror("ctl_create");
@@ -215,7 +203,6 @@ gt_bind(int argc, char **argv)
 
     fd_set_nonblock(tun_fd);
     fd_set_nonblock(mud_fd);
-    fd_set_nonblock(icmp_fd);
     fd_set_nonblock(ctl_fd);
 
     gt_log("running...\n");
@@ -223,16 +210,13 @@ gt_bind(int argc, char **argv)
     fd_set rfds;
     FD_ZERO(&rfds);
 
-    int last_fd = 1 + MAX(tun_fd, MAX(mud_fd, MAX(ctl_fd, icmp_fd)));
+    int last_fd = 1 + MAX(tun_fd, MAX(mud_fd, ctl_fd));
 
     while (!gt_quit) {
         FD_SET(tun_fd, &rfds);
         FD_SET(mud_fd, &rfds);
         FD_SET(ctl_fd, &rfds);
 
-        if (icmp_fd != -1)
-            FD_SET(icmp_fd, &rfds);
-
         if (select(last_fd, &rfds, NULL, NULL, NULL) == -1) {
             if (errno != EBADF)
                 continue;
@@ -240,22 +224,7 @@ gt_bind(int argc, char **argv)
             return 1;
         }
 
-        if (icmp_fd != -1 && FD_ISSET(icmp_fd, &rfds)) {
-            struct ip_common ic;
-            struct sockaddr_storage ss;
-            socklen_t sl = sizeof(ss);
-
-            ssize_t r = recvfrom(icmp_fd, buf, bufsize, 0,
-                                 (struct sockaddr *)&ss, &sl);
-
-            if (!ip_get_common(&ic, buf, r)) {
-                size_t mtu = ip_get_mtu(&ic, buf, r);
-                if (mtu > 0) {
-                    gt_log("received MTU from ICMP: %zu\n", mtu);
-                    mud_set_mtu(mud, GT_MTU(mtu));
-                }
-            }
-        }
+        mtu = gt_setup_mtu(mud, tun_name);
 
         if (FD_ISSET(ctl_fd, &rfds)) {
             struct ctl_msg req, res = {.reply = 1};
@@ -288,35 +257,38 @@ gt_bind(int argc, char **argv)
                         res.ret = EAGAIN;
 
                         for (unsigned i = 0; i < count; i++) {
-                            if (i && sendto(ctl_fd, &res, sizeof(res), 0,
-                                            (const struct sockaddr *)&ss, sl) == -1)
-                                perror("sendto(ctl)");
                             memcpy(&res.path_status, &paths[i], sizeof(struct mud_path));
+                            if (sendto(ctl_fd, &res, sizeof(res), 0,
+                                       (const struct sockaddr *)&ss, sl) == -1)
+                                perror("sendto(ctl)");
                         }
 
                         res.ret = 0;
                     }
                     break;
                 case CTL_MTU:
-                    mud_set_mtu(mud, GT_MTU((size_t)req.mtu));
-                    res.mtu = gt_setup_mtu(mud, tun_name);
-                    mtu = res.mtu;
+                    mud_set_mtu(mud, req.mtu);
+                    mtu = gt_setup_mtu(mud, tun_name);
+                    res.mtu = mtu;
                     break;
                 case CTL_TC:
                     if (mud_set_tc(mud, req.tc))
                         res.ret = errno;
                     break;
+                case CTL_KXTIMEOUT:
+                    if (mud_set_keyx_timeout(mud, req.ms))
+                        res.ret = errno;
+                    break;
                 case CTL_TIMEOUT:
-                    if (mud_set_send_timeout(mud, req.timeout))
+                    if (mud_set_send_timeout(mud, req.ms))
                         res.ret = errno;
                     break;
                 case CTL_TIMETOLERANCE:
-                    if (mud_set_time_tolerance(mud, req.timetolerance))
+                    if (mud_set_time_tolerance(mud, req.ms))
                         res.ret = errno;
                     break;
                 case CTL_STATUS:
                     res.status.mtu = mtu;
-                    res.status.mtu_auto = (icmp_fd != -1);
                     res.status.chacha = chacha;
                     res.status.bind = bind_addr;
                     res.status.peer = peer_addr;
@@ -374,11 +346,12 @@ gt_bind(int argc, char **argv)
 
                 int r = mud_send(mud, &buf[p], q - p, tc);
 
-                if (r == -1 && errno == EMSGSIZE) {
-                    mtu = gt_setup_mtu(mud, tun_name);
-                } else {
-                    if (r == -1 && errno != EAGAIN)
+                if (r == -1) {
+                    if (errno == EMSGSIZE) {
+                        mtu = gt_setup_mtu(mud, tun_name);
+                    } else if (errno != EAGAIN) {
                         perror("mud_send");
+                    }
                 }
 
                 p = q;

src/common.c

@@ -108,5 +108,6 @@ gt_toaddr(char *str, size_t size, struct sockaddr *sa)
                            &((struct sockaddr_in6 *)sa)->sin6_addr, str, size);
     }
 
+    errno = EAFNOSUPPORT;
     return -1;
 }

src/common.h

@@ -21,6 +21,10 @@
 #define PACKAGE_VERSION "0.0.0"
 #endif
 
+#ifndef GT_RUNDIR
+#define GT_RUNDIR "/run/" PACKAGE_NAME
+#endif
+
 #define COUNT(x)       (sizeof(x)/sizeof(x[0]))
 
 #define ALIGN_SIZE     (1<<4)

src/ctl.h

@@ -10,6 +10,7 @@ enum ctl_type {
     CTL_STATUS,
     CTL_MTU,
     CTL_TC,
+    CTL_KXTIMEOUT,
     CTL_TIMEOUT,
     CTL_TIMETOLERANCE,
     CTL_PATH_STATUS,
@@ -26,15 +27,13 @@ struct ctl_msg {
         struct mud_path path_status;
         struct {
             size_t mtu;
-            int mtu_auto;
             int chacha;
             struct sockaddr_storage bind;
             struct sockaddr_storage peer;
         } status;
-        int mtu;
+        size_t mtu;
         int tc;
-        unsigned long timeout;
-        unsigned long timetolerance;
+        unsigned long ms;
     };
 };
 

src/path.c

@@ -21,11 +21,20 @@ gt_path_status(int fd)
         if (recv(fd, &res, sizeof(struct ctl_msg), 0) == -1)
             return -1;
 
+        if (res.type != req.type)
+            return -2;
+
+        if (!res.ret)
+            return 0;
+
         char bindstr[INET6_ADDRSTRLEN] = {0};
+        char publstr[INET6_ADDRSTRLEN] = {0};
         char peerstr[INET6_ADDRSTRLEN] = {0};
 
         if (gt_toaddr(bindstr, sizeof(bindstr),
                       (struct sockaddr *)&res.path_status.local_addr) ||
+            gt_toaddr(publstr, sizeof(publstr),
+                      (struct sockaddr *)&res.path_status.r_addr) ||
             gt_toaddr(peerstr, sizeof(peerstr),
                       (struct sockaddr *)&res.path_status.addr))
             return -2;
@@ -40,10 +49,15 @@ gt_path_status(int fd)
         }
 
         printf("path %s\n"
-               "  bind:  %s\n"
-               "  peer:  %s\n"
-               "  rtt:   %.3f\n",
-               statestr, bindstr, peerstr,
+               "  bind:   %s\n"
+               "  public: %s port %"PRIu16"\n"
+               "  peer:   %s port %"PRIu16"\n"
+               "  mtu:    %zu bytes\n"
+               "  rtt:    %.3f ms\n",
+               statestr, bindstr,
+               publstr, gt_get_port((struct sockaddr *)&res.path_status.r_addr),
+               peerstr, gt_get_port((struct sockaddr *)&res.path_status.addr),
+               res.path_status.mtu.ok + 28U,     /* ip+udp hdr */
                res.path_status.rtt/(double)1e3);
 
     } while (res.ret == EAGAIN);
@@ -69,7 +83,7 @@ gt_path(int argc, char **argv)
     if (argz(pathz, argc, argv))
         return 1;
 
-    int fd = ctl_connect("/run/" PACKAGE_NAME, dev);
+    int fd = ctl_connect(GT_RUNDIR, dev);
 
     if (fd == -1) {
         perror("path");

src/set.c

@@ -22,17 +22,35 @@ gt_set_mtu(int fd, size_t mtu)
         return 1;
     }
 
-    printf("mtu set to %i\n", res.mtu);
+    printf("mtu set to %zu\n", res.mtu);
 
     return 0;
 }
 
 static int
-gt_set_timeout(int fd, unsigned long timeout)
+gt_set_kxtimeout(int fd, unsigned long ms)
+{
+    struct ctl_msg res, req = {
+        .type = CTL_KXTIMEOUT,
+        .ms = ms,
+    };
+
+    int ret = ctl_reply(fd, &res, &req);
+
+    if (ret) {
+        perror("set kxtimeout");
+        return 1;
+    }
+
+    return 0;
+}
+
+static int
+gt_set_timeout(int fd, unsigned long ms)
 {
     struct ctl_msg res, req = {
         .type = CTL_TIMEOUT,
-        .timeout = timeout,
+        .ms = ms,
     };
 
     int ret = ctl_reply(fd, &res, &req);
@@ -46,11 +64,11 @@ gt_set_timeout(int fd, unsigned long timeout)
 }
 
 static int
-gt_set_timetolerance(int fd, unsigned long timetolerance)
+gt_set_timetolerance(int fd, unsigned long ms)
 {
     struct ctl_msg res, req = {
         .type = CTL_TIMETOLERANCE,
-        .timetolerance = timetolerance,
+        .ms = ms,
     };
 
     int ret = ctl_reply(fd, &res, &req);
@@ -113,13 +131,15 @@ gt_set(int argc, char **argv)
     const char *dev = NULL;
     size_t mtu;
     int tc;
-    unsigned long timetolerance;
+    unsigned long kxtimeout;
     unsigned long timeout;
+    unsigned long timetolerance;
 
     struct argz pathz[] = {
         {"dev", "NAME", &dev, argz_str},
         {"mtu", "BYTES", &mtu, argz_bytes},
         {"tc", "CS|AF|EF", &tc, gt_argz_tc},
+        {"kxtimeout", "SECONDS", &kxtimeout, argz_time},
         {"timeout", "SECONDS", &timeout, argz_time},
         {"timetolerance", "SECONDS", &timetolerance, argz_time},
         {NULL}};
@@ -127,7 +147,7 @@ gt_set(int argc, char **argv)
     if (argz(pathz, argc, argv))
         return 1;
 
-    int fd = ctl_connect("/run/" PACKAGE_NAME, dev);
+    int fd = ctl_connect(GT_RUNDIR, dev);
 
     if (fd == -1) {
         perror("set");
@@ -142,6 +162,9 @@ gt_set(int argc, char **argv)
     if (argz_is_set(pathz, "tc"))
         ret |= gt_set_tc(fd, tc);
 
+    if (argz_is_set(pathz, "kxtimeout"))
+        ret |= gt_set_kxtimeout(fd, kxtimeout);
+
     if (argz_is_set(pathz, "timeout"))
         ret |= gt_set_timeout(fd, timeout);
 

src/show.c

@@ -32,25 +32,21 @@ gt_show_dev_status(int fd, const char *dev)
         printf("server %s:\n"
                "  bind:      %s port %"PRIu16"\n"
                "  mtu:       %zu\n"
-               "  auto mtu:  %s\n"
                "  cipher:    %s\n",
                dev,
                bindstr, gt_get_port((struct sockaddr *)&res.status.bind),
                res.status.mtu,
-               res.status.mtu_auto ? "enabled" : "disabled",
                res.status.chacha ? "chacha20poly1305" : "aes256gcm");
     } else {
         printf("client %s:\n"
                "  bind:      %s port %"PRIu16"\n"
                "  peer:      %s port %"PRIu16"\n"
                "  mtu:       %zu\n"
-               "  auto mtu:  %s\n"
                "  cipher:    %s\n",
                dev,
                bindstr, gt_get_port((struct sockaddr *)&res.status.bind),
                peerstr, gt_get_port((struct sockaddr *)&res.status.peer),
                res.status.mtu,
-               res.status.mtu_auto ? "enabled" : "disabled",
                res.status.chacha ? "chacha20poly1305" : "aes256gcm");
     }
 
@@ -60,7 +56,7 @@ gt_show_dev_status(int fd, const char *dev)
 static int
 gt_show_dev(const char *dev)
 {
-    int fd = ctl_connect("/run/" PACKAGE_NAME, dev);
+    int fd = ctl_connect(GT_RUNDIR, dev);
 
     if (fd == -1) {
         perror(dev);
@@ -97,7 +93,7 @@ gt_show(int argc, char **argv)
         return 0;
     }
 
-    DIR *dp = opendir("/run/" PACKAGE_NAME);
+    DIR *dp = opendir(GT_RUNDIR);
 
     if (!dp) {
         if (errno == ENOENT)

systemd/glorytun-setup

@@ -45,7 +45,7 @@ HOST=$HOST
 PORT=$PORT
 BIND=$BIND
 BIND_PORT=$BIND_PORT
-OPTIONS="mtu auto"
+OPTIONS=
 EOF
 
 ( umask 077; echo "$KEY" > "$DIR/key" )

systemd/glorytun@.service.in

@@ -8,7 +8,7 @@ Restart=always
 EnvironmentFile=/etc/glorytun/%i/env
 ExecStart=@bindir@/glorytun-run keyfile /etc/glorytun/%i/key $OPTIONS
 ExecStartPost=-/etc/glorytun/%i/post.sh
-CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_RAW
+CapabilityBoundingSet=CAP_NET_ADMIN
 
 [Install]
 WantedBy=multi-user.target