Add u32 extension to match on ether source/destination

Use existing u32 mechanism to match based on Ethernet header.
No need for protocol that already exists.

tc/f_u32.c

@@ -405,6 +405,48 @@ static int parse_ip6_addr(int *argc_p, char ***argv_p,
 	return res;
 }
 
+static int parse_ether_addr(int *argc_p, char ***argv_p,
+			    struct tc_u32_sel *sel, int off)
+{
+	int res = -1;
+	int argc = *argc_p;
+	char **argv = *argv_p;
+	__u8 addr[6];
+	int offmask = 0;
+	__u32 key;
+	int i;
+
+	if (argc < 1)
+		return -1;
+
+	if (sscanf(*argv, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
+		   addr + 0, addr + 1, addr + 2,
+		   addr + 3, addr + 4, addr + 5) != 6) {
+		fprintf(stderr, "parse_ether_addr: improperly formed address '%s'\n",
+			*argv);
+		return -1;
+	}
+
+	argc--; argv++;
+	if (argc > 0 && strcmp(argv[0], "at") == 0) {
+		NEXT_ARG();
+		if (parse_at(&argc, &argv, &off, &offmask))
+			return -1;
+	}
+
+	for (i = 0; i < 6; i += 2) {
+		key = *(__u16 *) (addr + i);
+		
+		res = pack_key16(sel, key, 0xFFFF, off + i, offmask);
+		if (res < 0)
+			return -1;
+	}
+
+	*argc_p = argc;
+	*argv_p = argv;
+	return res;
+}
+
 static int parse_ip(int *argc_p, char ***argv_p, struct tc_u32_sel *sel)
 {
 	int res = -1;
@@ -509,6 +551,31 @@ static int parse_ip6(int *argc_p, char ***argv_p, struct tc_u32_sel *sel)
 	return res;
 }
 
+static int parse_ether(int *argc_p, char ***argv_p, struct tc_u32_sel *sel)
+{
+	int res = -1;
+	int argc = *argc_p;
+	char **argv = *argv_p;
+
+	if (argc < 2)
+		return -1;
+
+	if (strcmp(*argv, "src") == 0) {
+		NEXT_ARG();
+		res = parse_ether_addr(&argc, &argv, sel, -8);
+	} else if (strcmp(*argv, "dst") == 0) {
+		NEXT_ARG();
+		res = parse_ether_addr(&argc, &argv, sel, -14);
+	} else {
+		fprintf(stderr, "Unknown match: ether %s\n", *argv);
+		return -1;
+	}
+
+	*argc_p = argc;
+	*argv_p = argv;
+	return res;
+}
+
 #define parse_tcp parse_udp
 static int parse_udp(int *argc_p, char ***argv_p, struct tc_u32_sel *sel)
 {
@@ -629,6 +696,9 @@ static int parse_selector(int *argc_p, char ***argv_p,
 	} else if (matches(*argv, "mark") == 0) {
 		NEXT_ARG();
 		res = parse_mark(&argc, &argv, n);
+	} else if (matches(*argv, "ether") == 0) {
+		NEXT_ARG();
+		res = parse_ether(&argc, &argv, sel);
 	} else 
 		return -1;