tc mask patch

Hello Stephen,

As the current maintainer of iproute2 package, you could be interested
in including the attached patch that allow using masks in the fw filter
of the tc utility (very useful at least for me). AFAK, it works at least
from iproute2 version 2.6.20-?. Feel free to make the appropriate
cleaning changes if necessary, or contact me if you see any trouble.

Best regards,
François Delawarde.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>

tc/f_fw.c

@@ -40,19 +40,30 @@ static int fw_parse_opt(struct filter_util *qu, char *handle, int argc, char **a
 
 	memset(&tp, 0, sizeof(tp));
 
+	tail = NLMSG_TAIL(n);
+	addattr_l(n, 4096, TCA_OPTIONS, NULL, 0);
+
 	if (handle) {
+		char *slash;
+		__u32 mask = 0;
+		if ((slash = strchr(handle, '/')) != NULL)
+			*slash = '\0';
 		if (get_u32(&t->tcm_handle, handle, 0)) {
 			fprintf(stderr, "Illegal \"handle\"\n");
 			return -1;
 		}
+		if (slash) {
+			if (get_u32(&mask, slash+1, 0)) {
+				fprintf(stderr, "Illegal \"handle\" mask\n");
+				return -1;
+			}
+			addattr32(n, MAX_MSG, TCA_FW_MASK, mask);
+		}
 	}
 
 	if (argc == 0)
 		return 0;
 
-	tail = NLMSG_TAIL(n);
-	addattr_l(n, 4096, TCA_OPTIONS, NULL, 0);
-
 	while (argc > 0) {
 		if (matches(*argv, "classid") == 0 ||
 		    matches(*argv, "flowid") == 0) {
@@ -111,8 +122,16 @@ static int fw_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u
 
 	parse_rtattr_nested(tb, TCA_FW_MAX, opt);
 
-	if (handle)
-		fprintf(f, "handle 0x%x ", handle);
+	if (handle || tb[TCA_FW_MASK]) {
+		__u32 mark = 0, mask = 0;
+		if(handle)
+			mark = handle;
+		if(tb[TCA_FW_MASK] &&
+		    (mask = *(__u32*)RTA_DATA(tb[TCA_FW_MASK])) != 0xFFFFFFFF)
+			fprintf(f, "handle 0x%x/0x%x ", mark, mask);
+		else
+			fprintf(f, "handle 0x%x ", handle);
+	}
 
 	if (tb[TCA_FW_CLASSID]) {
 		SPRINT_BUF(b1);