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socksd: udp RSV and FRAG must be zero

--- a/sys/src/cmd/ip/socksd.c

+++ b/sys/src/cmd/ip/socksd.c

@@ -122,7 +122,10 @@

 		while((r = read(fd, msg.data, sizeof(msg.data))) > 0){

 			if(r < 4)

 				continue;

-			p = msg.data + 3;

+			p = msg.data;

+			if(p[0] | p[1] | p[2])

+				continue;

+			p += 3;

 			switch(*p++){

 			default:

 				continue;

-- 

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