dnsmasq/bugfix-deal-with-CONFRIM-when-binding-mac-with-ipv6.patch

From 068fe05737fe86185b5d55da7de6ea6b2668c911 Mon Sep 17 00:00:00 2001
From: liaichun <liaichun@huawei.com>
Date: Mon, 20 Apr 2020 16:17:24 +0800
Subject: [PATCH] bugfix-deal-with-CONFRIM-when-binding-mac-with-ipv6

---
 src/rfc3315.c | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/src/rfc3315.c b/src/rfc3315.c
index 004ebb8..8c22ded 100644
--- a/src/rfc3315.c
+++ b/src/rfc3315.c
@@ -1077,12 +1077,32 @@ static int dhcp6_no_relay(struct state *state, int msg_type, unsigned char *inbu
     case DHCP6CONFIRM:
       {
 	int good_addr = 0, bad_addr = 0;
+	int find_bind = 0;
+	struct dhcp_config *find_config = NULL;
 
 	/* set reply message type */
 	outmsgtype = DHCP6REPLY;
 	
 	log6_quiet(state, "DHCPCONFIRM", NULL, NULL);
-	
+
+	if(daemon->bind_mac_with_ip6) {
+	  if(state->mac) {
+	    for (find_config = daemon->dhcp_conf; find_config; find_config = find_config->next)
+	      if (config_has_mac(find_config, state->mac, state->mac_len, state->mac_type) && have_config(find_config, CONFIG_ADDR6)) {
+	        find_bind = 1;
+		break;
+	      }
+	  }
+	  /* requires all mac has binding ipv6 address. */
+	  if (find_bind == 0) {
+	    o1 = new_opt6(OPTION6_STATUS_CODE);
+	    put_opt6_short(DHCP6NOTONLINK);
+	    put_opt6_string(_("confirm failed, no binding found"));
+	    end_opt6(o1);
+	    return 1;
+	  }
+	}
+
 	for (opt = state->packet_options; opt; opt = opt6_next(opt, state->end))
 	  {
 	    void *ia_option, *ia_end;
@@ -1106,6 +1126,16 @@ static int dhcp6_no_relay(struct state *state, int msg_type, unsigned char *inbu
 		    good_addr = 1;
 		    log6_quiet(state, "DHCPREPLY", &req_addr, state->hostname);
 		  }
+
+		if(daemon->bind_mac_with_ip6) {
+		  if (!is_same_net6(&req_addr, &find_config->addr6, 128)) {
+		    o1 = new_opt6(OPTION6_STATUS_CODE);
+		    put_opt6_short(DHCP6NOTONLINK);
+		    put_opt6_string(_("confirm failed, not binding to this address"));
+		    end_opt6(o1);
+		    return 1;
+		  }
+		}
 	      }
 	  }	 
 	
-- 
2.33.0