Packet Location Interface
This commit is contained in:
Thomas Graf
parent
d378220c96
commit
db5bd57899
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@ -6,6 +6,9 @@ SUBDIRS = include lib src doc
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pkgconfig_DATA = libnl-2.0.pc
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sysconfdir = @sysconfdir@/libnl
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sysconf_DATA = etc/pktloc
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.PHONY: cscope
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cscope:
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cscope -b -q -R -Iinclude -slib -ssrc;
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@ -6,7 +6,7 @@
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# License as published by the Free Software Foundation version 2.1
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# of the License.
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#
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# Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
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# Copyright (c) 2003-2010 Thomas Graf <tgraf@suug.ch>
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#
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AC_INIT(libnl, 2.0, tgraf@suug.ch)
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@ -18,6 +18,8 @@ AC_PROG_CC
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AM_PROG_CC_C_O
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AC_PROG_INSTALL
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AM_PROG_LIBTOOL
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AM_PROG_LEX
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AC_PROG_YACC
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AC_C_CONST
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AC_C_INLINE
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@ -0,0 +1,44 @@
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#
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# Location definitions for packet matching
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#
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# name alignment offset mask
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ip.version u8 net+0 0xF0
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ip.hdrlen u8 net+0 0x0F
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ip.diffserv u8 net+1
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ip.length u16 net+2
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ip.id u16 net+4
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ip.df u8 net+6 0x40
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ip.mf u8 net+6 0x20
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ip.offset u16 net+6 0x1FFF
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ip.ttl u8 net+8
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ip.proto u8 net+9
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ip.chksum u16 net+10
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ip.src u32 net+12
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ip.dst u32 net+16
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#
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# Transmission Control Protocol (TCP)
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#
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# name alignment offset mask
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tcp.sport u16 tcp+0
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tcp.dport u16 tcp+2
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tcp.seq u32 tcp+4
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tcp.ack u32 tcp+8
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tcp.off u8 tcp+12 0xF0
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tcp.reserved u8 tcp+12 0x0F
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# FLAGS
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tcp.win u16 tcp+14
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tcp.csum u16 tcp+16
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tcp.urg u16 tcp+18
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tcp.opts u32 tcp+20
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#
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# User Datagram Protocol (UDP)
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#
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# name alignment offset mask
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udp.sport u16 tcp+0
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udp.dport u16 tcp+2
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udp.length u16 tcp+4
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udp.csum u16 tcp+6
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@ -23,6 +23,7 @@
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#include <stdarg.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <inttypes.h>
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#include <assert.h>
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@ -45,8 +45,9 @@ extern "C" {
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#define NLE_PROTO_MISMATCH 26
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#define NLE_NOACCESS 27
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#define NLE_PERM 28
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#define NLE_PKTLOC_FILE 29
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#define NLE_MAX NLE_PERM
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#define NLE_MAX NLE_PKTLOC_FILE
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extern const char * nl_geterror(int);
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extern void nl_perror(int, const char *);
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@ -0,0 +1,44 @@
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/*
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* netlink/route/pktloc.h Packet Location Aliasing
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* Copyright (c) 2010 Thomas Graf <tgraf@suug.ch>
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*/
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#ifndef NETLINK_PKTLOC_H_
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#define NETLINK_PKTLOC_H_
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#include <netlink/netlink.h>
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#include <netlink/cache.h>
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#include <netlink/route/tc.h>
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#include <linux/tc_ematch/tc_em_cmp.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct rtnl_pktloc
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{
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char * name;
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uint8_t align:4;
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uint8_t layer:4;
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uint8_t flags;
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uint16_t offset;
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uint32_t mask;
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struct nl_list_head list;
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};
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extern int rtnl_pktloc_lookup(const char *, struct rtnl_pktloc **);
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#ifdef __cplusplus
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}
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#endif
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#endif
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@ -1,6 +1,6 @@
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# -*- Makefile -*-
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AM_CFLAGS = -Wall -I${top_srcdir}/include -D_GNU_SOURCE
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AM_CFLAGS = -Wall -I${top_srcdir}/include -D_GNU_SOURCE -DSYSCONFDIR=\"$(sysconfdir)/libnl\"
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lib_LTLIBRARIES = \
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libnl.la libnl-genl.la libnl-route.la libnl-nf.la
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@ -23,6 +23,19 @@ libnl_nf_la_SOURCES = \
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netfilter/netfilter.c netfilter/nfnl.c netfilter/queue.c \
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netfilter/queue_msg.c netfilter/queue_msg_obj.c netfilter/queue_obj.c
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BUILT_SOURCES = route/pktloc_syntax.h
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CLEANFILES = \
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route/pktloc_grammar.c route/pktloc_grammar.h \
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route/pktloc_syntax.c route/pktloc_syntax.h
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# Hack to avoid using ylwrap. It does not function correctly in combination
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# with --header-file=
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route/pktloc_grammar.c: route/pktloc_grammar.l
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$(LEX) --header-file=route/pktloc_grammar.h $(LFLAGS) -o $@ $^
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route/pktloc_syntax.c: route/pktloc_syntax.y
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$(YACC) -d $(YFLAGS) -o $@ $^
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libnl_route_la_LDFLAGS = -version-info 2:0:0
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libnl_route_la_LIBADD = libnl.la
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libnl_route_la_SOURCES = \
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@ -40,4 +53,6 @@ libnl_route_la_SOURCES = \
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route/sch/fifo.c route/sch/htb.c route/sch/netem.c route/sch/prio.c \
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route/sch/red.c route/sch/sfq.c route/sch/tbf.c \
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\
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fib_lookup/lookup.c fib_lookup/request.c
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fib_lookup/lookup.c fib_lookup/request.c \
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\
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route/pktloc_syntax.c route/pktloc_grammar.c route/pktloc.c
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@ -42,6 +42,7 @@ static const char *errmsg[NLE_MAX+1] = {
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[NLE_PROTO_MISMATCH] = "Protocol mismatch",
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[NLE_NOACCESS] = "No Access",
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[NLE_PERM] = "Operation not permitted",
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[NLE_PKTLOC_FILE] = "Unable to open packet location file",
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};
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/**
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@ -0,0 +1,168 @@
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/*
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* lib/route/pktloc.c Packet Location Aliasing
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2 of the License.
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*
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* Copyright (c) 2008-2010 Thomas Graf <tgraf@suug.ch>
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*/
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/**
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* @ingroup tc
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* @defgroup pktloc Packet Location Aliasing
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* Packet Location Aliasing
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*
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* The packet location aliasing interface eases the use of offset definitions
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* inside packets by allowing them to be referenced by name. Known positions
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* of protocol fields are stored in a configuration file and associated with
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* a name for later reference. The configuration file is distributed with the
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* library and provides a well defined set of definitions for most common
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* protocol fields.
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*
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* @subsection pktloc_examples Examples
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* @par Example 1.1 Looking up a packet location
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* @code
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* struct rtnl_pktloc *loc;
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*
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* rtnl_pktloc_lookup("ip.src", &loc);
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* @endcode
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* @{
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*/
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#include <netlink-local.h>
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#include <netlink-tc.h>
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#include <netlink/netlink.h>
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#include <netlink/utils.h>
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#include <netlink/route/pktloc.h>
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#include "pktloc_syntax.h"
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#include "pktloc_grammar.h"
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/** @cond */
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#define PKTLOC_NAME_HT_SIZ 256
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static struct nl_list_head pktloc_name_ht[PKTLOC_NAME_HT_SIZ];
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/* djb2 */
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unsigned int pktloc_hash(const char *str)
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{
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unsigned long hash = 5381;
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int c;
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while ((c = *str++))
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hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
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return hash % PKTLOC_NAME_HT_SIZ;
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}
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void rtnl_pktloc_add(struct rtnl_pktloc *loc)
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{
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nl_list_add_tail(&loc->list, &pktloc_name_ht[pktloc_hash(loc->name)]);
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}
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extern int pktloc_parse(void *scanner);
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/** @endcond */
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static void rtnl_pktloc_free(struct rtnl_pktloc *loc)
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{
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if (!loc)
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return;
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free(loc->name);
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free(loc);
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}
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static int read_pktlocs(void)
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{
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YY_BUFFER_STATE buf;
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yyscan_t scanner = NULL;
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static time_t last_read;
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struct stat st = {0};
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char *path;
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int i, err;
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FILE *fd;
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asprintf(&path, "%s/pktloc", SYSCONFDIR);
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/* if stat fails, just try to read the file */
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if (stat(path, &st) == 0) {
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/* Don't re-read file if file is unchanged */
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if (last_read == st.st_mtime)
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return 0;
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}
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if (!(fd = fopen(path, "r")))
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return -NLE_PKTLOC_FILE;
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for (i = 0; i < PKTLOC_NAME_HT_SIZ; i++) {
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struct rtnl_pktloc *loc, *n;
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nl_list_for_each_entry_safe(loc, n, &pktloc_name_ht[i], list)
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rtnl_pktloc_free(loc);
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nl_init_list_head(&pktloc_name_ht[i]);
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}
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if ((err = pktloc_lex_init(&scanner)) < 0)
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return -NLE_FAILURE;
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buf = pktloc__create_buffer(fd, YY_BUF_SIZE, scanner);
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pktloc__switch_to_buffer(buf, scanner);
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if ((err = pktloc_parse(scanner)) < 0)
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return -NLE_FAILURE;
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if (scanner)
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pktloc_lex_destroy(scanner);
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free(path);
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last_read = st.st_mtime;
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return 0;
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}
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/**
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* Lookup packet location alias
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* @arg name Name of packet location.
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*
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* Tries to find a matching packet location alias for the supplied
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* packet location name.
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*
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* The file containing the packet location definitions is automatically
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* re-read if its modification time has changed since the last call.
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*
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* @return 0 on success or a negative error code.
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* @retval NLE_PKTLOC_FILE Unable to open packet location file.
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* @retval NLE_OBJ_NOTFOUND No matching packet location alias found.
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*/
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int rtnl_pktloc_lookup(const char *name, struct rtnl_pktloc **result)
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{
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struct rtnl_pktloc *loc;
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int hash, err;
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if ((err = read_pktlocs()) < 0)
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return err;
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hash = pktloc_hash(name);
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nl_list_for_each_entry(loc, &pktloc_name_ht[hash], list) {
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if (!strcasecmp(loc->name, name)) {
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*result = loc;
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return 0;
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}
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}
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return -NLE_OBJ_NOTFOUND;
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}
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static int __init pktloc_init(void)
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{
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int i;
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for (i = 0; i < PKTLOC_NAME_HT_SIZ; i++)
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nl_init_list_head(&pktloc_name_ht[i]);
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return 0;
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}
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@ -0,0 +1,42 @@
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%{
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#include <netlink-local.h>
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#include <netlink-tc.h>
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#include <netlink/netlink.h>
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#include <netlink/utils.h>
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#include <netlink/route/pktloc.h>
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#include "pktloc_syntax.h"
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%}
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%option 8bit
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%option reentrant
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%option warn
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%option noyywrap
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%option nounput
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%option bison-bridge
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%option bison-locations
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%option prefix="pktloc_"
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%%
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[ \t\r\n]+
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"#".*
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[[:digit:]]+ |
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0[xX][[:xdigit:]]+ {
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yylval->i = strtoul(yytext, NULL, 0);
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return NUMBER;
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}
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"+" { return yylval->i = yytext[0]; }
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[lL][iI][nN][kK] { yylval->i = TCF_LAYER_LINK; return LAYER; }
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[nN][eE][tT] { yylval->i = TCF_LAYER_NETWORK; return LAYER; }
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[tT][cC][pP] { yylval->i = TCF_LAYER_TRANSPORT; return LAYER; }
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[^ \t\r\n+]+ {
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yylval->s = strdup(yytext);
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if (yylval->s == NULL)
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return ERROR;
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return NAME;
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}
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@ -0,0 +1,108 @@
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%{
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#include <netlink-local.h>
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#include <netlink-tc.h>
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#include <netlink/netlink.h>
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#include <netlink/utils.h>
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#include <netlink/route/pktloc.h>
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%}
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%locations
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%error-verbose
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%define api.pure
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%name-prefix "pktloc_"
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%parse-param {void *scanner}
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%lex-param {void *scanner}
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%union {
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struct rtnl_pktloc *l;
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uint32_t i;
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char *s;
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}
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%{
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extern int pktloc_lex(YYSTYPE *, YYLTYPE *, void *);
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extern void rtnl_pktloc_add(struct rtnl_pktloc *);
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static void yyerror(YYLTYPE *locp, void *scanner, const char *msg)
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{
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/* FIXME */
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}
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%}
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%token <i> ERROR NUMBER LAYER
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%token <s> NAME
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%type <i> mask layer
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%type <l> location
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%destructor { free($$); } NAME
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%start input
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%%
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input:
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def
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{ }
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;
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def:
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/* empty */
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{ }
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| location def
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{ }
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;
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location:
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NAME NAME layer NUMBER mask
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{
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struct rtnl_pktloc *loc;
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if (!(loc = calloc(1, sizeof(*loc)))) {
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/* FIXME */
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}
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if (!strcasecmp($2, "u8"))
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loc->align = TCF_EM_ALIGN_U8;
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else if (!strcasecmp($2, "h8")) {
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loc->align = TCF_EM_ALIGN_U8;
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loc->flags = TCF_EM_CMP_TRANS;
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} else if (!strcasecmp($2, "u16"))
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loc->align = TCF_EM_ALIGN_U16;
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else if (!strcasecmp($2, "h16")) {
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loc->align = TCF_EM_ALIGN_U16;
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loc->flags = TCF_EM_CMP_TRANS;
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} else if (!strcasecmp($2, "u32"))
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loc->align = TCF_EM_ALIGN_U32;
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else if (!strcasecmp($2, "h32")) {
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loc->align = TCF_EM_ALIGN_U32;
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loc->flags = TCF_EM_CMP_TRANS;
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}
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free($2);
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loc->name = $1;
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loc->layer = $3;
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loc->offset = $4;
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loc->mask = $5;
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rtnl_pktloc_add(loc);
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$$ = loc;
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}
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;
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layer:
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/* empty */
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{ $$ = TCF_LAYER_NETWORK; }
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| LAYER '+'
|
||||
{ $$ = $1; }
|
||||
;
|
||||
|
||||
mask:
|
||||
/* empty */
|
||||
{ $$ = 0; }
|
||||
| NUMBER
|
||||
{ $$ = $1; }
|
||||
;
|
||||
|
|
@ -20,7 +20,8 @@ noinst_PROGRAMS = \
|
|||
nl-route-add nl-route-delete nl-route-get nl-route-list \
|
||||
nl-fib-lookup \
|
||||
nl-list-caches nl-list-sockets \
|
||||
nl-util-addr
|
||||
nl-util-addr \
|
||||
nl-pktloc-lookup
|
||||
|
||||
genl_ctrl_list_SOURCES = genl-ctrl-list.c
|
||||
genl_ctrl_list_LDADD = -lnl-genl -lnl-route
|
||||
|
|
@ -95,3 +96,6 @@ nl_list_sockets_LDADD = -lnl-route
|
|||
|
||||
nl_util_addr_SOURCES = nl-util-addr.c
|
||||
nl_util_addr_LDADD = -lnl-route
|
||||
|
||||
nl_pktloc_lookup_SOURCES = nl-pktloc-lookup.c
|
||||
nl_pktloc_lookup_LDADD = -lnl-route
|
||||
|
|
|
|||
|
|
@ -0,0 +1,37 @@
|
|||
/*
|
||||
* src/nl-pktloc-lookup.c Lookup packet location alias
|
||||
*
|
||||
* This library is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU Lesser General Public
|
||||
* License as published by the Free Software Foundation version 2.1
|
||||
* of the License.
|
||||
*
|
||||
* Copyright (c) 2010 Thomas Graf <tgraf@suug.ch>
|
||||
*/
|
||||
|
||||
#include <netlink/cli/utils.h>
|
||||
#include <netlink/route/pktloc.h>
|
||||
|
||||
static void print_usage(void)
|
||||
{
|
||||
printf("Usage: nl-pktloc-lookup <name>\n");
|
||||
exit(0);
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
struct rtnl_pktloc *loc;
|
||||
int err;
|
||||
|
||||
if (argc < 2)
|
||||
print_usage();
|
||||
|
||||
if ((err = rtnl_pktloc_lookup(argv[1], &loc)) < 0)
|
||||
nl_cli_fatal(err, "Unable to lookup packet location: %s",
|
||||
nl_geterror(err));
|
||||
|
||||
printf("%s: %u %u+%u 0x%x %u\n", loc->name, loc->align,
|
||||
loc->layer, loc->offset, loc->mask, loc->flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue