Tunnel don't fragment bit configurable

[project/netifd.git] / system-linux.c

diff --git a/system-linux.c b/system-linux.c
index e5364e0..dae98b0 100644 (file)
--- a/system-linux.c
+++ b/system-linux.c
@@ -41,7 +41,6 @@
 #define RTN_FAILED_POLICY 12
 #endif
 
-#include <unistd.h>
 #include <string.h>
 #include <fcntl.h>
 #include <glob.h>
@@ -1419,11 +1418,11 @@ out:
        return ret;
 }
 
-
 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
 {
        struct blob_attr *tb[__TUNNEL_ATTR_MAX];
        struct blob_attr *cur;
+       bool set_df = true;
        const char *str;
 
        system_del_ip_tunnel(name);
@@ -1435,9 +1434,15 @@ int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
                return -EINVAL;
        str = blobmsg_data(cur);
 
+       if ((cur = tb[TUNNEL_ATTR_DF]))
+               set_df = blobmsg_get_bool(cur);
+
        unsigned int ttl = 0;
-       if ((cur = tb[TUNNEL_ATTR_TTL]) && (ttl = blobmsg_get_u32(cur)) > 255)
-               return -EINVAL;
+       if ((cur = tb[TUNNEL_ATTR_TTL])) {
+               ttl = blobmsg_get_u32(cur);
+               if (ttl > 255 || (!set_df && ttl))
+                       return -EINVAL;
+       }
 
        unsigned int link = 0;
        if ((cur = tb[TUNNEL_ATTR_LINK])) {
@@ -1449,14 +1454,13 @@ int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
                        link = iface->l3_dev.dev->ifindex;
        }
 
-
        if (!strcmp(str, "sit")) {
                struct ip_tunnel_parm p = {
                        .link = link,
                        .iph = {
                                .version = 4,
                                .ihl = 5,
-                               .frag_off = htons(IP_DF),
+                               .frag_off = set_df ? htons(IP_DF) : 0,
                                .protocol = IPPROTO_IPV6,
                                .ttl = ttl
                        }