+ implement (two lines) the kernel side of 'lookup dscp N' to use the

  dscp as a search key in table lookups;

+ (re)implement a sysctl variable to control the expire frequency of
  pipes and queues when they become empty;

+ add 'queue number' as optional part of the flow_id. This can be
  enabled with the command

        queue X config mask queue ...

  and makes it possible to support priority-based schedulers, where
  packets should be grouped according to the priority and not some
  fields in the 5-tuple.
  This is implemented as follows:
  - redefine a field in the ipfw_flow_id (in sys/netinet/ip_fw.h) but
    without changing the size or shape of the structure, so there are
    no ABI changes. On passing, also document how other fields are
    used, and remove some useless assignments in ip_fw2.c

  - implement small changes in the userland code to set/read the field;

  - revise the functions in ip_dummynet.c to manipulate masks so they
    also handle the additional field;

There are no ABI changes in this commit.

1 files changed, 13 insertions, 4 deletions

diff --git a/sbin/ipfw/dummynet.c b/sbin/ipfw/dummynet.c
index 0ec9030..598aa68 100644
--- a/sbin/ipfw/dummynet.c
+++ b/sbin/ipfw/dummynet.c
@@ -141,7 +141,8 @@ print_mask(struct ipfw_flow_id *id)
 {
 	if (!IS_IP6_FLOW_ID(id)) {
 		printf("    "
-		    "mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n",
+		    "mask: %s 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n",
+		    id->extra ? "queue," : "",
 		    id->proto,
 		    id->src_ip, id->src_port,
 		    id->dst_ip, id->dst_port);
@@ -151,7 +152,8 @@ print_mask(struct ipfw_flow_id *id)
 		    "Tot_pkt/bytes Pkt/Byte Drp\n");
 	} else {
 		char buf[255];
-		printf("\n        mask: proto: 0x%02x, flow_id: 0x%08x,  ",
+		printf("\n        mask: %sproto: 0x%02x, flow_id: 0x%08x,  ",
+		    id->extra ? "queue," : "",
 		    id->proto, id->flow_id6);
 		inet_ntop(AF_INET6, &(id->src_ip6), buf, sizeof(buf));
 		printf("%s/0x%04x -> ", buf, id->src_port);
@@ -175,7 +177,8 @@ list_flow(struct dn_flow *ni)
 
 	pe = getprotobynumber(id->proto);
 		/* XXX: Should check for IPv4 flows */
-	printf("%3u ", (ni->oid.id) & 0xff);
+	printf("%3u%c", (ni->oid.id) & 0xff,
+		id->extra ? '*' : ' ');
 	if (!IS_IP6_FLOW_ID(id)) {
 		if (pe)
 			printf("%-4s ", pe->p_name);
@@ -910,6 +913,7 @@ ipfw_config_pipe(int ac, char **av)
 			    case TOK_ALL:
 				    /*
 				     * special case, all bits significant
+				     * except 'extra' (the queue number)
 				     */
 				    mask->dst_ip = ~0;
 				    mask->src_ip = ~0;
@@ -922,6 +926,11 @@ ipfw_config_pipe(int ac, char **av)
 				    *flags |= DN_HAVE_MASK;
 				    goto end_mask;
 
+			    case TOK_QUEUE:
+				    mask->extra = ~0;
+				    *flags |= DN_HAVE_MASK;
+				    goto end_mask;
+
 			    case TOK_DSTIP:
 				    mask->addr_type = 4;
 				    p32 = &mask->dst_ip;
@@ -992,7 +1001,7 @@ ipfw_config_pipe(int ac, char **av)
 				    if (a > 0xFF)
 					    errx(EX_DATAERR,
 						"proto mask must be 8 bit");
-				    fs->flow_mask.proto = (uint8_t)a;
+				    mask->proto = (uint8_t)a;
 			    }
 			    if (a != 0)
 				    *flags |= DN_HAVE_MASK;