Added support for the "new" type of IP6 support in AnyConnect.

If the client sends "X-CSTP-Full-IPv6-Capability: true", then we
use the headers:
     X-CSTP-Address-IP6: 2001:db8:1000:1000::1/64
     X-CSTP-Split-Include-IP6: 2001:db8:1000:1001::/64
     X-CSTP-Split-Include-IP6: 2001:db8:1000:1002::/64

(see corresponding openconnect change)

src/config.c

@@ -112,7 +112,6 @@ static struct cfg_options available_options[] = {
 	{ .name = "ipv6-nbns", .type = OPTION_MULTI_LINE, .mandatory = 0 }, /* alias nbns */
 
 	{ .name = "ipv6-network", .type = OPTION_STRING, .mandatory = 0 },
-	{ .name = "ipv6-netmask", .type = OPTION_STRING, .mandatory = 0 },
 	{ .name = "ipv6-prefix", .type = OPTION_NUMERIC, .mandatory = 0 },
 	{ .name = "route-add-cmd", .type = OPTION_STRING, .mandatory = 0 },
 	{ .name = "route-del-cmd", .type = OPTION_STRING, .mandatory = 0 },
@@ -416,11 +415,12 @@ unsigned force_cert_auth;
 	READ_STRING("ipv4-netmask", config->network.ipv4_netmask);
 
 	READ_STRING("ipv6-network", config->network.ipv6);
-	READ_STRING("ipv6-netmask", config->network.ipv6_netmask);
 
 	READ_NUMERIC("ipv6-prefix", prefix);
-	if (prefix > 0) 
+	if (prefix > 0) {
 		config->network.ipv6_netmask = ipv6_prefix_to_mask(prefix);
+		config->network.ipv6_prefix = prefix;
+	}
 
 	READ_MULTI_LINE("custom-header", config->custom_header, config->custom_header_size);
 	READ_MULTI_LINE("split-dns", config->split_dns, config->split_dns_size);

src/group-config.c

@@ -52,7 +52,6 @@ static struct cfg_options available_options[] = {
 	{ .name = "ipv6-network", .type = OPTION_STRING },
 	{ .name = "ipv4-netmask", .type = OPTION_STRING },
 	{ .name = "ipv6-prefix", .type = OPTION_NUMERIC },
-	{ .name = "ipv6-netmask", .type = OPTION_STRING },
 	{ .name = "rx-data-per-sec", .type = OPTION_NUMERIC, },
 	{ .name = "tx-data-per-sec", .type = OPTION_NUMERIC, },
 	{ .name = "net-priority", .type = OPTION_STRING, },
@@ -168,10 +167,12 @@ unsigned prefix = 0;
 	READ_RAW_STRING("ipv4-network", config->ipv4_network);
 	READ_RAW_STRING("ipv6-network", config->ipv6_network);
 	READ_RAW_STRING("ipv4-netmask", config->ipv4_netmask);
-	READ_RAW_STRING("ipv6-netmask", config->ipv6_netmask);
+
 	READ_RAW_NUMERIC("ipv6-prefix", prefix);
-	if (prefix > 0) 
+	if (prefix > 0) {
 		config->ipv6_netmask = ipv6_prefix_to_mask(prefix);
+		config->ipv6_prefix = prefix;
+	}
 
 	READ_RAW_NUMERIC("rx-data-per-sec", config->rx_per_sec);
 	READ_RAW_NUMERIC("tx-data-per-sec", config->tx_per_sec);

src/ipc.proto

@@ -91,12 +91,13 @@ message auth_reply_msg
 	/* additional config */
 	optional string ipv4_netmask = 15;
 	optional string ipv6_netmask = 16;
-	optional uint32 rx_per_sec = 17;
-	optional uint32 tx_per_sec = 18;
-	optional uint32 net_priority = 19;
-	repeated string routes = 20;
-	repeated string dns = 21;
-	repeated string nbns = 22;
+	optional uint32 ipv6_prefix = 17;
+	optional uint32 rx_per_sec = 18;
+	optional uint32 tx_per_sec = 19;
+	optional uint32 net_priority = 20;
+	repeated string routes = 21;
+	repeated string dns = 22;
+	repeated string nbns = 23;
 }
 
 /* RESUME_FETCH_REQ + RESUME_DELETE_REQ */

src/main-auth.c

@@ -109,6 +109,7 @@ int send_auth_reply(main_server_st* s, struct proc_st* proc,
 
 		msg.ipv4_netmask = proc->config.ipv4_netmask;
 		msg.ipv6_netmask = proc->config.ipv6_netmask;
+		msg.ipv6_prefix = proc->config.ipv6_prefix;
 		if (proc->config.rx_per_sec != 0) {
 			msg.has_rx_per_sec = 1;
 			msg.rx_per_sec = proc->config.rx_per_sec;

src/main-misc.c

@@ -216,6 +216,10 @@ static int read_additional_config_file(main_server_st * s, struct proc_st *proc,
 			cfg.ipv6_netmask = NULL;
 		}
 
+		if (proc->config.ipv6_prefix != 0) {
+			proc->config.ipv6_prefix = cfg.ipv6_prefix;
+		}
+
 		if (proc->config.cgroup == NULL) {
 			proc->config.cgroup = cfg.cgroup;
 			cfg.cgroup = NULL;

src/vpn.h

@@ -125,6 +125,7 @@ struct group_cfg_st {
 
 	char *ipv4_network;
 	char *ipv6_network;
+	unsigned ipv6_prefix;
 	char *ipv4_netmask;
 	char *ipv6_netmask;
 	
@@ -142,6 +143,8 @@ struct vpn_st {
 	char *ipv4;
 	char *ipv4_local; /* local IPv4 address */
 	char *ipv6_netmask;
+	unsigned ipv6_prefix;
+
 	char *ipv6;
 	char *ipv6_local; /* local IPv6 address */
 	unsigned int mtu;

src/worker-auth.c

@@ -310,6 +310,8 @@ static int recv_auth_reply(worker_st * ws, char *txt, size_t max_txt_size)
 				    strdup(msg->ipv6_netmask);
 			}
 
+			ws->config->network.ipv6_prefix = msg->ipv6_prefix;
+
 			if (msg->has_rx_per_sec)
 				ws->config->rx_per_sec = msg->rx_per_sec;
 

src/worker-misc.c

@@ -164,6 +164,7 @@ int complete_vpn_info(worker_st * ws, struct vpn_st *vinfo)
 
 	vinfo->ipv4_netmask = ws->config->network.ipv4_netmask;
 	vinfo->ipv6_netmask = ws->config->network.ipv6_netmask;
+	vinfo->ipv6_prefix = ws->config->network.ipv6_prefix;
 
 	if (ws->config->network.mtu != 0) {
 		vinfo->mtu = ws->config->network.mtu;

src/worker-vpn.c

@@ -181,6 +181,7 @@ int url_cb(http_parser * parser, const char *at, size_t length)
 #define STR_HDR_CMTU "X-CSTP-MTU"
 #define STR_HDR_ATYPE "X-CSTP-Address-Type"
 #define STR_HDR_HOST "X-CSTP-Hostname"
+#define STR_HDR_FULL_IPV6 "X-CSTP-Full-IPv6-Capability"
 
 #define CS_ESALSA20 "OC-DTLS1_2-ESALSA20-SHA"
 #define CS_SALSA20 "OC-DTLS1_2-SALSA20-SHA"
@@ -327,6 +328,11 @@ static void value_check(struct worker_st *ws, struct http_req_st *req)
 		    NULL)
 			req->no_ipv6 = 1;
 		break;
+	case HEADER_FULL_IPV6:
+		if (memmem(value, value_length, "true", 4) !=
+		    NULL)
+			ws->full_ipv6 = 1;
+		break;
 	case HEADER_DTLS_MTU:
 		req->dtls_mtu = atoi((char *)value);
 		break;
@@ -443,6 +449,10 @@ static void header_check(struct http_req_st *req)
 		   strncmp((char *)req->header.data, STR_HDR_USER_AGENT,
 			   req->header.length) == 0) {
 		req->next_header = HEADER_USER_AGENT;
+	} else if (req->header.length == sizeof(STR_HDR_FULL_IPV6) - 1 &&
+		   strncmp((char *)req->header.data, STR_HDR_FULL_IPV6,
+			   req->header.length) == 0) {
+		req->next_header = HEADER_FULL_IPV6;
 	} else {
 		req->next_header = 0;
 	}
@@ -1024,7 +1034,7 @@ static int connect_handler(worker_st * ws)
 	unsigned tls_pending, dtls_pending = 0, i;
 	time_t udp_recv_time = 0, now;
 	struct timespec tnow;
-	unsigned mtu_overhead = 0;
+	unsigned mtu_overhead = 0, ip6;
 	int sndbuf;
 	socklen_t sl;
 	bandwidth_st b_tx;
@@ -1140,16 +1150,23 @@ static int connect_handler(worker_st * ws)
 
 	if (ws->vinfo.ipv6 && req->no_ipv6 == 0) {
 		oclog(ws, LOG_DEBUG, "sending IPv6 %s", ws->vinfo.ipv6);
-		ret =
-		    tls_printf(ws->session, "X-CSTP-Address: %s\r\n",
-			       ws->vinfo.ipv6);
-		SEND_ERR(ret);
-
-		if (ws->vinfo.ipv6_netmask) {
+		if (ws->full_ipv6 && ws->vinfo.ipv6_prefix) {
 			ret =
-			    tls_printf(ws->session, "X-CSTP-Netmask: %s\r\n",
-				       ws->vinfo.ipv6_netmask);
+			    tls_printf(ws->session, "X-CSTP-Address-IP6: %s/%u\r\n",
+			       ws->vinfo.ipv6, ws->vinfo.ipv6_prefix);
 			SEND_ERR(ret);
+		} else {
+			ret =
+			    tls_printf(ws->session, "X-CSTP-Address: %s\r\n",
+			       ws->vinfo.ipv6);
+			SEND_ERR(ret);
+
+			if (ws->vinfo.ipv6_netmask) {
+				ret =
+				    tls_printf(ws->session, "X-CSTP-Netmask: %s\r\n",
+					       ws->vinfo.ipv6_netmask);
+				SEND_ERR(ret);
+			}
 		}
 	}
 
@@ -1185,25 +1202,48 @@ static int connect_handler(worker_st * ws)
 	}
 
 	for (i = 0; i < ws->vinfo.routes_size; i++) {
-		if (req->no_ipv6 != 0 && strchr(ws->vinfo.routes[i], ':') != 0)
+		if (strchr(ws->vinfo.routes[i], ':') != 0)
+			ip6 = 1;
+		else
+			ip6 = 0;
+
+		if (req->no_ipv6 != 0 && ip6 != 0)
 			continue;
 		if (req->no_ipv4 != 0 && strchr(ws->vinfo.routes[i], '.') != 0)
 			continue;
 		oclog(ws, LOG_DEBUG, "adding route %s", ws->vinfo.routes[i]);
-		ret = tls_printf(ws->session,
-				 "X-CSTP-Split-Include: %s\r\n",
-				 ws->vinfo.routes[i]);
+		
+		if (ip6 != 0 && ws->full_ipv6) {
+			ret = tls_printf(ws->session,
+					 "X-CSTP-Split-Include-IP6: %s\r\n",
+					 ws->vinfo.routes[i]);
+		} else {
+			ret = tls_printf(ws->session,
+					 "X-CSTP-Split-Include: %s\r\n",
+					 ws->vinfo.routes[i]);
+		}
 		SEND_ERR(ret);
 	}
 
 	for (i = 0; i < ws->routes_size; i++) {
-		if (req->no_ipv6 != 0 && strchr(ws->routes[i], ':') != 0)
+		if (strchr(ws->routes[i], ':') != 0)
+			ip6 = 1;
+		else
+			ip6 = 0;
+
+		if (req->no_ipv6 != 0 && ip6 != 0)
 			continue;
 		if (req->no_ipv4 != 0 && strchr(ws->routes[i], '.') != 0)
 			continue;
 		oclog(ws, LOG_DEBUG, "adding private route %s", ws->routes[i]);
-		ret = tls_printf(ws->session,
-				 "X-CSTP-Split-Include: %s\r\n", ws->routes[i]);
+
+		if (ip6 != 0 && ws->full_ipv6) {
+			ret = tls_printf(ws->session,
+					 "X-CSTP-Split-Include-IP6: %s\r\n", ws->routes[i]);
+		} else {
+			ret = tls_printf(ws->session,
+					 "X-CSTP-Split-Include: %s\r\n", ws->routes[i]);
+		}
 		SEND_ERR(ret);
 	}
 	ret =

src/worker.h

@@ -51,6 +51,7 @@ enum {
 	HEADER_DTLS_MTU,
 	HEADER_DTLS_CIPHERSUITE,
 	HEADER_CONNECTION,
+	HEADER_FULL_IPV6,
 	HEADER_USER_AGENT,
 };
 
@@ -146,6 +147,10 @@ typedef struct worker_st {
 	unsigned last_bad_mtu;
 	unsigned conn_mtu;
 	
+	/* Indicates whether the new IPv6 headers will
+	 * be sent or the old */
+	unsigned full_ipv6;
+
 	/* Buffer used by worker */
 	uint8_t * buffer;
 	unsigned buffer_size;