From aa2caf2f5e3989d1b1ef326a4fbb8cd2fd4f9faf Mon Sep 17 00:00:00 2001
From: brian <brian@FreeBSD.org>
Date: Wed, 25 Jul 2001 03:34:07 +0000
Subject: If an attempt is made to LISTEN for a service tag that's already
 being LISTENed for, return EEXISTS.

Only match the magic "*" service tag if no other LISTEN service tags
match.

Require an explicit LISTEN for an empty service tag in order to match
empty service requests.

Approved by:	julian
MFC after:	3 days
---
 sys/netgraph/ng_pppoe.c | 42 ++++++++++++++++++++++++++++--------------
 1 file changed, 28 insertions(+), 14 deletions(-)

(limited to 'sys/netgraph/ng_pppoe.c')

diff --git a/sys/netgraph/ng_pppoe.c b/sys/netgraph/ng_pppoe.c
index faa323c..2378e7a 100644
--- a/sys/netgraph/ng_pppoe.c
+++ b/sys/netgraph/ng_pppoe.c
@@ -451,13 +451,18 @@ AAA
  * for testing allow a null string to match 1st found and a null service
  * to match all requests. Also make '*' do the same.
  */
+
+#define NG_MATCH_EXACT	1
+#define NG_MATCH_ANY	2
+
 static hook_p
-pppoe_match_svc(node_p node, char *svc_name, int svc_len)
+pppoe_match_svc(node_p node, char *svc_name, int svc_len, int match)
 {
 	sessp	sp	= NULL;
 	negp	neg	= NULL;
 	priv_p	privp	= NG_NODE_PRIVATE(node);
-	hook_p hook;
+	hook_p	allhook	= NULL;
+	hook_p	hook;
 
 AAA
 	LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
@@ -473,17 +478,12 @@ AAA
 			continue;
 
 		neg = sp->neg;
-		/* XXX check validity of this */
-		/* special case, NULL request. match 1st found. */
-		if (svc_len == 0)
-			break;
 
-		/* XXX check validity of this */
 		/* Special case for a blank or "*" service name (wildcard) */
-		if ((neg->service_len == 0)
-		||  ((neg->service_len == 1)
-		  && (neg->service.data[0] == '*'))) {
-			break;
+		if (match == NG_MATCH_ANY && neg->service_len == 1 &&
+		    neg->service.data[0] == '*') {
+			allhook = hook;
+			continue;
 		}
 
 		/* If the lengths don't match, that aint it. */
@@ -491,10 +491,13 @@ AAA
 			continue;
 
 		/* An exact match? */
+		if (svc_len == 0)
+			break;
+
 		if (strncmp(svc_name, neg->service.data, svc_len) == 0)
 			break;
 	}
-	return (hook);
+	return (hook ? hook : allhook);
 }
 /**************************************************************************
  * Routine to find a particular session that matches an incoming packet	  *
@@ -685,6 +688,17 @@ AAA
 			}
 			sp = NG_HOOK_PRIVATE(hook);
 
+			if (msg->header.cmd == NGM_PPPOE_LISTEN) {
+				/*
+				 * Ensure we aren't already listening for this
+				 * service.
+				 */
+				if (pppoe_match_svc(node, ourmsg->data,
+				    ourmsg->data_len, NG_MATCH_EXACT) != NULL) {
+					LEAVE(EEXIST);
+				}
+			}
+
 			/*
 			 * PPPOE_SERVICE advertisments are set up
 			 * on sessions that are in PRIMED state.
@@ -991,12 +1005,12 @@ AAA
 					LEAVE(ENETUNREACH);
 				}
 				sendhook = pppoe_match_svc(NG_HOOK_NODE(hook),
-			    		tag->tag_data, ntohs(tag->tag_len));
+			    		tag->tag_data, ntohs(tag->tag_len),
+					NG_MATCH_ANY);
 				if (sendhook) {
 					NG_FWD_NEW_DATA(error, item,
 								sendhook, m);
 				} else {
-					printf("no such service\n");
 					LEAVE(ENETUNREACH);
 				}
 				break;
-- 
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