Add support for packet filtering

2 files changed, 150 insertions, 1 deletions

diff --git a/include/net/bpf.h b/include/net/bpf.h
new file mode 100644
index 0000000..c5f7c1f
--- /dev/null
+++ b/include/net/bpf.h
@@ -0,0 +1,147 @@
+/*	From: NetBSD: bpf.h,v 1.12 1995/09/27 18:30:40 thorpej Exp */
+
+/*
+ * Copyright (c) 1990, 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from the Stanford/CMU enet packet filter,
+ * (net/enet.c) distributed as part of 4.3BSD, and code contributed
+ * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
+ * Berkeley Laboratory.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)bpf.h	8.1 (Berkeley) 6/10/93
+ */
+
+#ifndef _NET_BPF_H_
+#define _NET_BPF_H_
+
+/*
+ * Alignment macros.  BPF_WORDALIGN rounds up to the next 
+ * even multiple of BPF_ALIGNMENT. 
+ */
+#define BPF_ALIGNMENT sizeof(long)
+#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
+
+#define BPF_MAXINSNS 512
+#define BPF_MAXBUFSIZE 0x8000
+#define BPF_MINBUFSIZE 32
+
+/*
+ *  Structure for BIOCSETF.
+ */
+struct bpf_program {
+	unsigned int bf_len;
+	struct bpf_insn *bf_insns;
+};
+
+/*
+ * The instruction encondings.
+ */
+/* instruction classes */
+#define BPF_CLASS(code) ((code) & 0x07)
+#define		BPF_LD		0x00
+#define		BPF_LDX		0x01
+#define		BPF_ST		0x02
+#define		BPF_STX		0x03
+#define		BPF_ALU		0x04
+#define		BPF_JMP		0x05
+#define		BPF_RET		0x06
+#define		BPF_MISC	0x07
+
+/* ld/ldx fields */
+#define BPF_SIZE(code)	((code) & 0x18)
+#define		BPF_W		0x00
+#define		BPF_H		0x08
+#define		BPF_B		0x10
+#define BPF_MODE(code)	((code) & 0xe0)
+#define		BPF_IMM 	0x00
+#define		BPF_ABS		0x20
+#define		BPF_IND		0x40
+#define		BPF_MEM		0x60
+#define		BPF_LEN		0x80
+#define		BPF_MSH		0xa0
+
+/* alu/jmp fields */
+#define BPF_OP(code)	((code) & 0xf0)
+#define		BPF_ADD		0x00
+#define		BPF_SUB		0x10
+#define		BPF_MUL		0x20
+#define		BPF_DIV		0x30
+#define		BPF_OR		0x40
+#define		BPF_AND		0x50
+#define		BPF_LSH		0x60
+#define		BPF_RSH		0x70
+#define		BPF_NEG		0x80
+#define		BPF_JA		0x00
+#define		BPF_JEQ		0x10
+#define		BPF_JGT		0x20
+#define		BPF_JGE		0x30
+#define		BPF_JSET	0x40
+#define BPF_SRC(code)	((code) & 0x08)
+#define		BPF_K		0x00
+#define		BPF_X		0x08
+
+/* ret - BPF_K and BPF_X also apply */
+#define BPF_RVAL(code)	((code) & 0x18)
+#define		BPF_A		0x10
+
+/* misc */
+#define BPF_MISCOP(code) ((code) & 0xf8)
+#define		BPF_TAX		0x00
+#define		BPF_TXA		0x80
+
+/*
+ * The instruction data structure.
+ */
+struct bpf_insn {
+	unsigned short	code;
+	unsigned char	jt;
+	unsigned char	jf;
+	int		k;
+};
+
+/*
+ * Macros for insn array initializers.
+ */
+#define BPF_STMT(code, k) { (unsigned short)(code), 0, 0, k }
+#define BPF_JUMP(code, k, jt, jf) { (unsigned short)(code), jt, jf, k }
+
+#ifdef _KERNEL
+int	 bpf_validate __P((struct bpf_insn *, int));
+u_int	 bpf_filter __P((struct bpf_insn *, u_char *, u_int, u_int));
+#endif
+
+/*
+ * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
+ */
+#define BPF_MEMWORDS 16
+
+#endif /* _NET_BPF_H_ */
diff --git a/include/net/pppio.h b/include/net/pppio.h
index 547b798..d364aea 100644
--- a/include/net/pppio.h
+++ b/include/net/pppio.h
@@ -24,7 +24,7 @@
  * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
  * OR MODIFICATIONS.
  *
- * $Id: pppio.h,v 1.6 1995/10/27 03:36:58 paulus Exp $
+ * $Id: pppio.h,v 1.7 1996/04/04 02:46:59 paulus Exp $
  */
 
 #define _PPPIO(n)	(('p' << 8) + (n))
@@ -47,6 +47,8 @@
 #define PPPIO_BIND	_PPPIO(145)	/* bind to SAP */
 #define PPPIO_NPMODE	_PPPIO(146)	/* set mode for handling data pkts */
 #define PPPIO_GIDLE	_PPPIO(147)	/* get time since last data pkt */
+#define PPPIO_PASSFILT	_PPPIO(148)	/* set filter for packets to pass */
+#define PPPIO_ACTIVEFILT _PPPIO(149)	/* set filter for "link active" pkts */
 
 /*
  * Values for PPPIO_CFLAGS