sys/net/if_spppsubr.c

2257 	u_short authproto;
2303 			authproto = (p[2] << 8) + p[3];
2304 			if (authproto == PPP_CHAP && p[1] != 5) {
2410 			authproto = (p[2] << 8) + p[3];
2411 			if (sp->myauth.proto != authproto) {
2416 					       sppp_proto_name(authproto));
2421 			if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2755 	u_short authproto;
2776 		authproto = sp->hisauth.proto;
2778 		opt[i++] = authproto == PPP_CHAP? 5: 4;
2779 		opt[i++] = authproto >> 8;
2780 		opt[i++] = authproto;
2781 		if (authproto == PPP_CHAP)
3997 	/* challenge, failure and success are his authproto */
4088 	/* response is my authproto */
4397 	/* PAP request is my authproto */
4455 	/* ack and nak are his authproto */