Hi.
I'm working on a patch to support QoS setting on an IPv4 connection, but I'm being out-clevered by the kernel.
The code is doing the following:
s = socket(AF_INET6, SOCK_STREAM);
...
sin6.sin6_family = AF_INET6;
sin6.sin6_addr = ... // ::FFFF:<IPv4> address
and then, as the man page says:
IPv4 connections can be handled with the v6 API by using the v4-mapped-
on-v6 address type; thus a program only needs to support this API type
to support both protocols. This is handled transparently by the
address handling functions in the C library.
so how can I tell in a couple of lines of code if the connection will result in IPv4?
The patch looked like:
+#if defined(SOL_IP)&& defined(IP_TOS)
+ if (d->d_addr.sa.sa_family == AF_INET&& InetQoS != 0x00)
+ (void) setsockopt(d->d_socket, SOL_IP,
+ IP_TOS, (char *)&InetQoS, sizeof(InetQoS));
+#endif
but it strikes me that this will not cover the above case.
Any ideas welcome.
Thanks,
-Philip
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