Re: [Qemu-devel] [PATCHv7 9/9] qapi-schema, qemu-options & slirp: Adding Qemu options for IPv6 addresses

[Samuel Thibault <samuel.thibault@gnu.org>]

Thomas Huth, on Wed 17 Feb 2016 12:59:04 +0100, wrote:
> The IPv4 code seems to have a sanity check that the vhost address is
> within the same net as specified with the "net=" parameter... maybe the
> IPv6 part should have that, too? Or use the prefix from "ip6-net=" here
> if ip6-host has not been specified manually?

I'd say the latter indeed.  I have reworked this part of the code, and
then the implementation matches the documentation :)

@@ -235,6 +242,52 @@ static int net_slirp_init(NetClientState *peer, const char *model,
     }
 #endif
 
+
+    if (!vprefix6) {
+        vprefix6 = "fec0::";
+    }
+    if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
+        return -1;
+    }
+
+    if (!vprefix6_len) {
+        vprefix6_len = 64;
+    }
+    if (vprefix6_len < 0 || vprefix6_len > 128) {
+        return -1;
+    }
+
+    if (vhost6) {
+        if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
+            return -1;
+        }
+        if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
+            return -1;
+        }
+    } else {
+        if (vprefix6_len > 126) {
+            return -1;
+        }
+        ip6_host = ip6_prefix;
+        ip6_host.s6_addr[15] |= 2;
+    }
+
+    if (vnameserver6) {
+        if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
+            return -1;
+        }
+        if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
+            return -1;
+        }
+    } else {
+        if (vprefix6_len > 126) {
+            return -1;
+        }
+        ip6_dns = ip6_prefix;
+        ip6_dns.s6_addr[15] |= 3;
+    }
+
+
     nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
 
     snprintf(nc->info_str, sizeof(nc->info_str),