Function ng_pppoe_rcvmsg

freebsd/netgraph/ng_pppoe.c:762–1254

* Get a netgraph control message. * Check it is one we understand. If needed, send a response. * We sometimes save the address for an async action later. * Always free the message. */

 * Always free the message.
 */
static int
ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
	struct epoch_tracker et;
	priv_p privp = NG_NODE_PRIVATE(node);
	struct ngpppoe_init_data *ourmsg = NULL;
	struct ng_mesg *resp = NULL;
	int error = 0;
	hook_p hook = NULL;
	sessp sp = NULL;
	negp neg = NULL;
	struct ng_mesg *msg;

	NGI_GET_MSG(item, msg);
	CTR5(KTR_NET, "%20s: node [%x] (%p) got message %d with cookie %d",
	    __func__, node->nd_ID, node, msg->header.cmd,
	    msg->header.typecookie);

	/* Deal with message according to cookie and command. */
	switch (msg->header.typecookie) {
	case NGM_PPPOE_COOKIE:
		switch (msg->header.cmd) {
		case NGM_PPPOE_CONNECT:
		case NGM_PPPOE_LISTEN:
		case NGM_PPPOE_OFFER:
		case NGM_PPPOE_SERVICE:
		case NGM_PPPOE_SEND_HURL:
		case NGM_PPPOE_SEND_MOTM:
			ourmsg = (struct ngpppoe_init_data *)msg->data;
			if (msg->header.arglen < sizeof(*ourmsg)) {
				log(LOG_ERR, "ng_pppoe[%x]: init data too "
				    "small\n", node->nd_ID);
				LEAVE(EMSGSIZE);
			}
			if (msg->header.cmd == NGM_PPPOE_SEND_HURL ||
			    msg->header.cmd == NGM_PPPOE_SEND_MOTM) {
				if (msg->header.arglen - sizeof(*ourmsg) >
				    PPPOE_PADM_VALUE_SIZE) {
					log(LOG_ERR, "ng_pppoe[%x]: message "
					    "too big\n", node->nd_ID);
					LEAVE(EMSGSIZE);
				}
			} else {
				if (msg->header.arglen - sizeof(*ourmsg) >
				    PPPOE_SERVICE_NAME_SIZE) {
					log(LOG_ERR, "ng_pppoe[%x]: service name "
					    "too big\n", node->nd_ID);
					LEAVE(EMSGSIZE);
				}
			}
			if (msg->header.arglen - sizeof(*ourmsg) <
			    ourmsg->data_len) {
				log(LOG_ERR, "ng_pppoe[%x]: init data has bad "
				    "length, %d should be %zd\n", node->nd_ID,
				    ourmsg->data_len,
				    msg->header.arglen - sizeof (*ourmsg));
				LEAVE(EMSGSIZE);
			}