From 19f4f86bfed21c5326ed2acebe1163f3a83e832b Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Mon, 6 May 2024 04:25:50 +0200
Subject: Adding upstream version 241.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/network/netdev/tuntap.c | 161 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 src/network/netdev/tuntap.c

(limited to 'src/network/netdev/tuntap.c')

diff --git a/src/network/netdev/tuntap.c b/src/network/netdev/tuntap.c
new file mode 100644
index 0000000..951138d
--- /dev/null
+++ b/src/network/netdev/tuntap.c
@@ -0,0 +1,161 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/if_tun.h>
+#include <net/if.h>
+#include <netinet/if_ether.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "netdev/tuntap.h"
+#include "user-util.h"
+
+#define TUN_DEV "/dev/net/tun"
+
+static int netdev_fill_tuntap_message(NetDev *netdev, struct ifreq *ifr) {
+        TunTap *t;
+
+        assert(netdev);
+        assert(netdev->ifname);
+        assert(ifr);
+
+        if (netdev->kind == NETDEV_KIND_TAP) {
+                t = TAP(netdev);
+                ifr->ifr_flags |= IFF_TAP;
+        } else {
+                t = TUN(netdev);
+                ifr->ifr_flags |= IFF_TUN;
+        }
+
+        if (!t->packet_info)
+                ifr->ifr_flags |= IFF_NO_PI;
+
+        if (t->one_queue)
+                ifr->ifr_flags |= IFF_ONE_QUEUE;
+
+        if (t->multi_queue)
+                ifr->ifr_flags |= IFF_MULTI_QUEUE;
+
+        if (t->vnet_hdr)
+                ifr->ifr_flags |= IFF_VNET_HDR;
+
+        strncpy(ifr->ifr_name, netdev->ifname, IFNAMSIZ-1);
+
+        return 0;
+}
+
+static int netdev_tuntap_add(NetDev *netdev, struct ifreq *ifr) {
+        _cleanup_close_ int fd;
+        TunTap *t = NULL;
+        const char *user;
+        const char *group;
+        uid_t uid;
+        gid_t gid;
+        int r;
+
+        assert(netdev);
+        assert(ifr);
+
+        fd = open(TUN_DEV, O_RDWR|O_CLOEXEC);
+        if (fd < 0)
+                return log_netdev_error_errno(netdev, -errno,  "Failed to open tun dev: %m");
+
+        if (ioctl(fd, TUNSETIFF, ifr) < 0)
+                return log_netdev_error_errno(netdev, -errno, "TUNSETIFF failed on tun dev: %m");
+
+        if (netdev->kind == NETDEV_KIND_TAP)
+                t = TAP(netdev);
+        else
+                t = TUN(netdev);
+
+        assert(t);
+
+        if (t->user_name) {
+                user = t->user_name;
+
+                r = get_user_creds(&user, &uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
+                if (r < 0)
+                        return log_netdev_error_errno(netdev, r, "Cannot resolve user name %s: %m", t->user_name);
+
+                if (ioctl(fd, TUNSETOWNER, uid) < 0)
+                        return log_netdev_error_errno(netdev, -errno, "TUNSETOWNER failed on tun dev: %m");
+        }
+
+        if (t->group_name) {
+                group = t->group_name;
+
+                r = get_group_creds(&group, &gid, USER_CREDS_ALLOW_MISSING);
+                if (r < 0)
+                        return log_netdev_error_errno(netdev, r, "Cannot resolve group name %s: %m", t->group_name);
+
+                if (ioctl(fd, TUNSETGROUP, gid) < 0)
+                        return log_netdev_error_errno(netdev, -errno, "TUNSETGROUP failed on tun dev: %m");
+
+        }
+
+        if (ioctl(fd, TUNSETPERSIST, 1) < 0)
+                return log_netdev_error_errno(netdev, -errno, "TUNSETPERSIST failed on tun dev: %m");
+
+        return 0;
+}
+
+static int netdev_create_tuntap(NetDev *netdev) {
+        struct ifreq ifr = {};
+        int r;
+
+        r = netdev_fill_tuntap_message(netdev, &ifr);
+        if (r < 0)
+                return r;
+
+        return netdev_tuntap_add(netdev, &ifr);
+}
+
+static void tuntap_done(NetDev *netdev) {
+        TunTap *t = NULL;
+
+        assert(netdev);
+
+        if (netdev->kind == NETDEV_KIND_TUN)
+                t = TUN(netdev);
+        else
+                t = TAP(netdev);
+
+        assert(t);
+
+        t->user_name = mfree(t->user_name);
+        t->group_name = mfree(t->group_name);
+}
+
+static int tuntap_verify(NetDev *netdev, const char *filename) {
+        assert(netdev);
+
+        if (netdev->mtu != 0)
+                log_netdev_warning(netdev, "MTU configured for %s, ignoring", netdev_kind_to_string(netdev->kind));
+
+        if (netdev->mac)
+                log_netdev_warning(netdev, "MAC configured for %s, ignoring", netdev_kind_to_string(netdev->kind));
+
+        return 0;
+}
+
+const NetDevVTable tun_vtable = {
+        .object_size = sizeof(TunTap),
+        .sections = "Match\0NetDev\0Tun\0",
+        .config_verify = tuntap_verify,
+        .done = tuntap_done,
+        .create = netdev_create_tuntap,
+        .create_type = NETDEV_CREATE_INDEPENDENT,
+};
+
+const NetDevVTable tap_vtable = {
+        .object_size = sizeof(TunTap),
+        .sections = "Match\0NetDev\0Tap\0",
+        .config_verify = tuntap_verify,
+        .done = tuntap_done,
+        .create = netdev_create_tuntap,
+        .create_type = NETDEV_CREATE_INDEPENDENT,
+};
-- 
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