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| -rw-r--r-- | COPYING | 502 | ||||
| -rw-r--r-- | Make_global.am | 24 | ||||
| -rw-r--r-- | Makefile.am | 11 | ||||
| -rw-r--r-- | configure.ac | 35 | ||||
| -rw-r--r-- | doxygen.cfg.in | 184 | ||||
| -rw-r--r-- | examples/Makefile.am | 10 | ||||
| -rw-r--r-- | examples/nfct-timeout-add.c | 85 | ||||
| -rw-r--r-- | examples/nfct-timeout-get.c | 104 | ||||
| -rw-r--r-- | include/Makefile.am | 1 | ||||
| -rw-r--r-- | include/libnetfilter_cttimeout/Makefile.am | 1 | ||||
| -rw-r--r-- | include/libnetfilter_cttimeout/libnetfilter_cttimeout.h | 106 | ||||
| -rw-r--r-- | include/linux/Makefile.am | 1 | ||||
| -rw-r--r-- | include/linux/netfilter/Makefile.am | 1 | ||||
| -rw-r--r-- | include/linux/netfilter/nf_conntrack_tcp.h | 79 | ||||
| -rw-r--r-- | include/linux/netfilter/nfnetlink.h | 95 | ||||
| -rw-r--r-- | include/linux/netfilter/nfnetlink_cttimeout.h | 114 | ||||
| -rw-r--r-- | libnetfilter_cttimeout.pc.in | 15 | ||||
| -rw-r--r-- | m4/.gitignore | 2 | ||||
| -rw-r--r-- | m4/gcc4_visibility.m4 | 21 | ||||
| -rw-r--r-- | src/Makefile.am | 8 | ||||
| -rw-r--r-- | src/internal.h | 12 | ||||
| -rw-r--r-- | src/libnetfilter_cttimeout.c | 555 | ||||
| -rw-r--r-- | src/libnetfilter_cttimeout.map | 21 |
23 files changed, 1987 insertions, 0 deletions
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If the library source code has changed at all since the last update, +# then increment revision (`c:r:a' becomes `c:r+1:a'). +# 4. If any interfaces have been added, removed, or changed since the last +# update, increment current, and set revision to 0. +# 5. If any interfaces have been added since the last public release, then +# increment age. +# 6. If any interfaces have been removed since the last public release, then +# set age to 0. +# </snippet> +# +LIBVERSION=0:0:0 + +AM_CPPFLAGS = ${regular_CPPFLAGS} -I${top_srcdir}/include ${LIBMNL_CFLAGS} +AM_CFLAGS = ${regular_CFLAGS} ${GCC_FVISIBILITY_HIDDEN} diff --git a/Makefile.am b/Makefile.am new file mode 100644 index 0000000..1247307 --- /dev/null +++ b/Makefile.am @@ -0,0 +1,11 @@ +include $(top_srcdir)/Make_global.am + +ACLOCAL_AMFLAGS = -I m4 + +SUBDIRS = src include examples +DIST_SUBDIRS = src include examples + +pkgconfigdir = $(libdir)/pkgconfig +pkgconfig_DATA = libnetfilter_cttimeout.pc + +${pkgconfig_DATA}: ${top_builddir}/config.status diff --git a/configure.ac b/configure.ac new file mode 100644 index 0000000..a4cf468 --- /dev/null +++ b/configure.ac @@ -0,0 +1,35 @@ +dnl Process this file with autoconf to create configure. + +AC_INIT([libnetfilter_cttimeout], [1.0.0]) +AC_CONFIG_AUX_DIR([build-aux]) +AC_CANONICAL_HOST +AC_CONFIG_MACRO_DIR([m4]) +AC_CONFIG_HEADERS([config.h]) + +AM_INIT_AUTOMAKE([-Wall foreign tar-pax no-dist-gzip dist-bzip2 + 1.6 subdir-objects]) + +dnl kernel style compile messages +m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])]) + +dnl Dependencies +PKG_CHECK_MODULES([LIBMNL], [libmnl >= 1.0.0]) + +AC_PROG_CC +AM_PROG_CC_C_O +AC_DISABLE_STATIC +LT_INIT +CHECK_GCC_FVISIBILITY +case "$host" in +*-*-linux*) ;; +*) AC_MSG_ERROR([Linux only, dude!]);; +esac + +regular_CPPFLAGS="-D_FILE_OFFSET_BITS=64 -D_REENTRANT" +regular_CFLAGS="-Wall -Waggregate-return -Wmissing-declarations \ + -Wmissing-prototypes -Wshadow -Wstrict-prototypes \ + -Wformat=2 -pipe" +AC_SUBST([regular_CPPFLAGS]) +AC_SUBST([regular_CFLAGS]) +AC_CONFIG_FILES([Makefile src/Makefile include/Makefile include/libnetfilter_cttimeout/Makefile include/linux/Makefile include/linux/netfilter/Makefile examples/Makefile libnetfilter_cttimeout.pc doxygen.cfg]) +AC_OUTPUT diff --git a/doxygen.cfg.in b/doxygen.cfg.in new file mode 100644 index 0000000..5131166 --- /dev/null +++ b/doxygen.cfg.in @@ -0,0 +1,184 @@ +DOXYFILE_ENCODING = UTF-8 +PROJECT_NAME = @PACKAGE@ +PROJECT_NUMBER = @VERSION@ +OUTPUT_DIRECTORY = doxygen +CREATE_SUBDIRS = NO +OUTPUT_LANGUAGE = English +BRIEF_MEMBER_DESC = YES +REPEAT_BRIEF = YES +ABBREVIATE_BRIEF = +ALWAYS_DETAILED_SEC = NO +INLINE_INHERITED_MEMB = NO +FULL_PATH_NAMES = NO +STRIP_FROM_PATH = +STRIP_FROM_INC_PATH = +SHORT_NAMES = NO +JAVADOC_AUTOBRIEF = NO +QT_AUTOBRIEF = NO +MULTILINE_CPP_IS_BRIEF = NO +INHERIT_DOCS = YES +SEPARATE_MEMBER_PAGES = NO +TAB_SIZE = 8 +ALIASES = +OPTIMIZE_OUTPUT_FOR_C = YES +OPTIMIZE_OUTPUT_JAVA = NO +OPTIMIZE_FOR_FORTRAN = NO +OPTIMIZE_OUTPUT_VHDL = NO +BUILTIN_STL_SUPPORT = NO +CPP_CLI_SUPPORT = NO +SIP_SUPPORT = NO +DISTRIBUTE_GROUP_DOC = NO +SUBGROUPING = YES +TYPEDEF_HIDES_STRUCT = NO +EXTRACT_ALL = NO +EXTRACT_PRIVATE = NO +EXTRACT_STATIC = NO +EXTRACT_LOCAL_CLASSES = YES +EXTRACT_LOCAL_METHODS = NO +EXTRACT_ANON_NSPACES = NO +HIDE_UNDOC_MEMBERS = NO +HIDE_UNDOC_CLASSES = NO +HIDE_FRIEND_COMPOUNDS = NO +HIDE_IN_BODY_DOCS = NO +INTERNAL_DOCS = NO +CASE_SENSE_NAMES = YES +HIDE_SCOPE_NAMES = NO +SHOW_INCLUDE_FILES = YES +INLINE_INFO = YES +SORT_MEMBER_DOCS = YES +SORT_BRIEF_DOCS = NO +SORT_GROUP_NAMES = NO +SORT_BY_SCOPE_NAME = NO +GENERATE_TODOLIST = YES +GENERATE_TESTLIST = YES +GENERATE_BUGLIST = YES +GENERATE_DEPRECATEDLIST= YES +ENABLED_SECTIONS = +MAX_INITIALIZER_LINES = 30 +SHOW_USED_FILES = YES +SHOW_DIRECTORIES = NO +FILE_VERSION_FILTER = +QUIET = NO +WARNINGS = YES +WARN_IF_UNDOCUMENTED = YES +WARN_IF_DOC_ERROR = YES +WARN_NO_PARAMDOC = NO +WARN_FORMAT = "$file:$line: $text" +WARN_LOGFILE = +INPUT = . +INPUT_ENCODING = UTF-8 +FILE_PATTERNS = *.c libnetfilter_cttimeout.h +RECURSIVE = YES +EXCLUDE = +EXCLUDE_SYMLINKS = NO +EXCLUDE_PATTERNS = */.git/* .*.d +EXCLUDE_SYMBOLS = EXPORT_SYMBOL nfct_timeout +EXAMPLE_PATH = +EXAMPLE_PATTERNS = +EXAMPLE_RECURSIVE = NO +IMAGE_PATH = +INPUT_FILTER = +FILTER_PATTERNS = +FILTER_SOURCE_FILES = NO +SOURCE_BROWSER = YES +INLINE_SOURCES = NO +STRIP_CODE_COMMENTS = YES +REFERENCED_BY_RELATION = NO +REFERENCES_RELATION = NO +REFERENCES_LINK_SOURCE = YES +USE_HTAGS = NO +VERBATIM_HEADERS = YES +ALPHABETICAL_INDEX = NO +COLS_IN_ALPHA_INDEX = 5 +IGNORE_PREFIX = +GENERATE_HTML = YES +HTML_OUTPUT = html +HTML_FILE_EXTENSION = .html +HTML_HEADER = +HTML_STYLESHEET = +HTML_ALIGN_MEMBERS = YES +GENERATE_HTMLHELP = NO +GENERATE_DOCSET = NO +DOCSET_FEEDNAME = "Doxygen generated docs" +DOCSET_BUNDLE_ID = org.doxygen.Project +HTML_DYNAMIC_SECTIONS = NO +CHM_FILE = +HHC_LOCATION = +GENERATE_CHI = NO +BINARY_TOC = NO +TOC_EXPAND = NO +DISABLE_INDEX = NO +ENUM_VALUES_PER_LINE = 4 +GENERATE_TREEVIEW = NO +TREEVIEW_WIDTH = 250 +GENERATE_LATEX = NO +LATEX_OUTPUT = latex +LATEX_CMD_NAME = latex +MAKEINDEX_CMD_NAME = makeindex +COMPACT_LATEX = NO +PAPER_TYPE = a4wide +EXTRA_PACKAGES = +LATEX_HEADER = +PDF_HYPERLINKS = YES +USE_PDFLATEX = YES +LATEX_BATCHMODE = NO +LATEX_HIDE_INDICES = NO +GENERATE_RTF = NO +RTF_OUTPUT = rtf +COMPACT_RTF = NO +RTF_HYPERLINKS = NO +RTF_STYLESHEET_FILE = +RTF_EXTENSIONS_FILE = +GENERATE_MAN = YES +MAN_OUTPUT = man +MAN_EXTENSION = .3 +MAN_LINKS = NO +GENERATE_XML = NO +XML_OUTPUT = xml +XML_SCHEMA = +XML_DTD = +XML_PROGRAMLISTING = YES +GENERATE_AUTOGEN_DEF = NO +GENERATE_PERLMOD = NO +PERLMOD_LATEX = NO +PERLMOD_PRETTY = YES +PERLMOD_MAKEVAR_PREFIX = +ENABLE_PREPROCESSING = YES +MACRO_EXPANSION = NO +EXPAND_ONLY_PREDEF = NO +SEARCH_INCLUDES = YES +INCLUDE_PATH = +INCLUDE_FILE_PATTERNS = +PREDEFINED = +EXPAND_AS_DEFINED = +SKIP_FUNCTION_MACROS = YES +TAGFILES = +GENERATE_TAGFILE = +ALLEXTERNALS = NO +EXTERNAL_GROUPS = YES +PERL_PATH = /usr/bin/perl +CLASS_DIAGRAMS = YES +MSCGEN_PATH = +HIDE_UNDOC_RELATIONS = YES +HAVE_DOT = YES +CLASS_GRAPH = YES +COLLABORATION_GRAPH = YES +GROUP_GRAPHS = YES +UML_LOOK = NO +TEMPLATE_RELATIONS = NO +INCLUDE_GRAPH = YES +INCLUDED_BY_GRAPH = YES +CALL_GRAPH = NO +CALLER_GRAPH = NO +GRAPHICAL_HIERARCHY = YES +DIRECTORY_GRAPH = YES +DOT_IMAGE_FORMAT = png +DOT_PATH = +DOTFILE_DIRS = +DOT_GRAPH_MAX_NODES = 50 +MAX_DOT_GRAPH_DEPTH = 0 +DOT_TRANSPARENT = YES +DOT_MULTI_TARGETS = NO +GENERATE_LEGEND = YES +DOT_CLEANUP = YES +SEARCHENGINE = NO diff --git a/examples/Makefile.am b/examples/Makefile.am new file mode 100644 index 0000000..ab577d7 --- /dev/null +++ b/examples/Makefile.am @@ -0,0 +1,10 @@ +include $(top_srcdir)/Make_global.am + +check_PROGRAMS = nfct-timeout-add \ + nfct-timeout-get + +nfct_timeout_add_SOURCES = nfct-timeout-add.c +nfct_timeout_add_LDADD = ../src/libnetfilter_cttimeout.la ${LIBMNL_LIBS} + +nfct_timeout_get_SOURCES = nfct-timeout-get.c +nfct_timeout_get_LDADD = ../src/libnetfilter_cttimeout.la ${LIBMNL_LIBS} diff --git a/examples/nfct-timeout-add.c b/examples/nfct-timeout-add.c new file mode 100644 index 0000000..c4fe312 --- /dev/null +++ b/examples/nfct-timeout-add.c @@ -0,0 +1,85 @@ +/* + * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org> + * (C) 2012 by Vyatta Inc. <http://www.vyatta.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ +#include <stdlib.h> +#include <time.h> +#include <string.h> +#include <netinet/in.h> + +#include <libmnl/libmnl.h> +#include <linux/netfilter/nfnetlink_cttimeout.h> +#include <libnetfilter_cttimeout/libnetfilter_cttimeout.h> + +int main(int argc, char *argv[]) +{ + struct mnl_socket *nl; + char buf[MNL_SOCKET_BUFFER_SIZE]; + struct nlmsghdr *nlh; + uint32_t portid, seq; + struct nfct_timeout *t; + int ret; + + if (argc != 4) { + fprintf(stderr, "Usage: %s [name] [l3proto] [l4proto]\n", + argv[0]); + fprintf(stderr, "Example: %s test 2 255\n", argv[0]); + exit(EXIT_FAILURE); + } + + t = nfct_timeout_alloc(); + if (t == NULL) { + perror("OOM"); + exit(EXIT_FAILURE); + } + + nfct_timeout_attr_set(t, NFCT_TIMEOUT_ATTR_NAME, argv[1]); + nfct_timeout_attr_set_u16(t, NFCT_TIMEOUT_ATTR_L3PROTO, atoi(argv[2])); + nfct_timeout_attr_set_u8(t, NFCT_TIMEOUT_ATTR_L4PROTO, atoi(argv[3])); + + nfct_timeout_policy_attr_set_u32(t, NFCT_TIMEOUT_ATTR_GENERIC, 100); + + seq = time(NULL); + nlh = nfct_timeout_nlmsg_build_hdr(buf, IPCTNL_MSG_TIMEOUT_NEW, + NLM_F_CREATE | NLM_F_ACK, seq); + nfct_timeout_nlmsg_build_payload(nlh, t); + + nfct_timeout_free(t); + + nl = mnl_socket_open(NETLINK_NETFILTER); + if (nl == NULL) { + perror("mnl_socket_open"); + exit(EXIT_FAILURE); + } + + if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) { + perror("mnl_socket_bind"); + exit(EXIT_FAILURE); + } + portid = mnl_socket_get_portid(nl); + + if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { + perror("mnl_socket_send"); + exit(EXIT_FAILURE); + } + + ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); + while (ret > 0) { + ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL); + if (ret <= 0) + break; + ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); + } + if (ret == -1) { + perror("error"); + exit(EXIT_FAILURE); + } + mnl_socket_close(nl); + + return EXIT_SUCCESS; +} diff --git a/examples/nfct-timeout-get.c b/examples/nfct-timeout-get.c new file mode 100644 index 0000000..211dedb --- /dev/null +++ b/examples/nfct-timeout-get.c @@ -0,0 +1,104 @@ +/* + * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org> + * (C) 2012 by Vyatta Inc. <http://www.vyatta.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ +#include <stdlib.h> +#include <time.h> +#include <string.h> +#include <netinet/in.h> + +#include <linux/netfilter/nfnetlink_cttimeout.h> +#include <libmnl/libmnl.h> +#include <libnetfilter_cttimeout/libnetfilter_cttimeout.h> + +static int timeout_cb(const struct nlmsghdr *nlh, void *data) +{ + struct nfct_timeout *t; + char buf[4096]; + + t = nfct_timeout_alloc(); + if (t == NULL) { + perror("OOM"); + goto err; + } + + if (nfct_timeout_nlmsg_parse_payload(nlh, t) < 0) { + perror("nfct_timeout_nlmsg_parse_payload"); + goto err_free; + } + + nfct_timeout_snprintf(buf, sizeof(buf), t, 0); + printf("%s\n", buf); + +err_free: + nfct_timeout_free(t); +err: + return MNL_CB_OK; +} + +int main(int argc, char *argv[]) +{ + struct mnl_socket *nl; + char buf[MNL_SOCKET_BUFFER_SIZE]; + struct nlmsghdr *nlh; + uint32_t portid, seq; + struct nfct_timeout *t = NULL; + int ret; + + if (argc == 2) { + t = nfct_timeout_alloc(); + if (t == NULL) { + perror("OOM"); + exit(EXIT_FAILURE); + } + } + + seq = time(NULL); + if (t == NULL) { + nlh = nfct_timeout_nlmsg_build_hdr(buf, IPCTNL_MSG_TIMEOUT_GET, + NLM_F_DUMP, seq); + } else { + nlh = nfct_timeout_nlmsg_build_hdr(buf, IPCTNL_MSG_TIMEOUT_GET, + NLM_F_ACK, seq); + nfct_timeout_attr_set(t, NFCT_TIMEOUT_ATTR_NAME, argv[1]); + nfct_timeout_nlmsg_build_payload(nlh, t); + nfct_timeout_free(t); + } + + nl = mnl_socket_open(NETLINK_NETFILTER); + if (nl == NULL) { + perror("mnl_socket_open"); + exit(EXIT_FAILURE); + } + + if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) { + perror("mnl_socket_bind"); + exit(EXIT_FAILURE); + } + portid = mnl_socket_get_portid(nl); + + if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { + perror("mnl_socket_send"); + exit(EXIT_FAILURE); + } + + ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); + while (ret > 0) { + ret = mnl_cb_run(buf, ret, seq, portid, timeout_cb, NULL); + if (ret <= 0) + break; + ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); + } + if (ret == -1) { + perror("error"); + exit(EXIT_FAILURE); + } + mnl_socket_close(nl); + + return EXIT_SUCCESS; +} diff --git a/include/Makefile.am b/include/Makefile.am new file mode 100644 index 0000000..d502177 --- /dev/null +++ b/include/Makefile.am @@ -0,0 +1 @@ +SUBDIRS = libnetfilter_cttimeout linux diff --git a/include/libnetfilter_cttimeout/Makefile.am b/include/libnetfilter_cttimeout/Makefile.am new file mode 100644 index 0000000..63c9eea --- /dev/null +++ b/include/libnetfilter_cttimeout/Makefile.am @@ -0,0 +1 @@ +pkginclude_HEADERS = libnetfilter_cttimeout.h diff --git a/include/libnetfilter_cttimeout/libnetfilter_cttimeout.h b/include/libnetfilter_cttimeout/libnetfilter_cttimeout.h new file mode 100644 index 0000000..be37636 --- /dev/null +++ b/include/libnetfilter_cttimeout/libnetfilter_cttimeout.h @@ -0,0 +1,106 @@ +#ifndef _LIBNETFILTER_CTTIMEOUT_H_ +#define _LIBNETFILTER_CTTIMEOUT_H_ + +#include <sys/types.h> +#include <linux/netfilter/nfnetlink_conntrack.h> + +struct nfct_timeout; + +struct nfct_timeout *nfct_timeout_alloc(void); +void nfct_timeout_free(struct nfct_timeout *); + +enum nfct_timeout_attr { + NFCT_TIMEOUT_ATTR_NAME= 0, + NFCT_TIMEOUT_ATTR_L3PROTO, + NFCT_TIMEOUT_ATTR_L4PROTO, + NFCT_TIMEOUT_ATTR_POLICY, + NFCT_TIMEOUT_ATTR_MAX +}; + +enum nfct_timeout_tcp_attr { + NFCT_TIMEOUT_ATTR_TCP_SYN_SENT = 0, + NFCT_TIMEOUT_ATTR_TCP_SYN_RECV, + NFCT_TIMEOUT_ATTR_TCP_ESTABLISHED, + NFCT_TIMEOUT_ATTR_TCP_FIN_WAIT, + NFCT_TIMEOUT_ATTR_TCP_CLOSE_WAIT, + NFCT_TIMEOUT_ATTR_TCP_LAST_ACK, + NFCT_TIMEOUT_ATTR_TCP_TIME_WAIT, + NFCT_TIMEOUT_ATTR_TCP_CLOSE, + NFCT_TIMEOUT_ATTR_TCP_SYN_SENT2, + NFCT_TIMEOUT_ATTR_TCP_RETRANS, + NFCT_TIMEOUT_ATTR_TCP_UNACK, + NFCT_TIMEOUT_ATTR_TCP_MAX +}; + +enum nfct_timeout_udp_attr { + NFCT_TIMEOUT_ATTR_UDP_UNREPLIED = 0, + NFCT_TIMEOUT_ATTR_UDP_REPLIED, + NFCT_TIMEOUT_ATTR_UDP_MAX +}; + +enum nfct_timeout_udplite_attr { + NFCT_TIMEOUT_ATTR_UDPLITE_UNREPLIED = 0, + NFCT_TIMEOUT_ATTR_UDPLITE_REPLIED, + NFCT_TIMEOUT_ATTR_UDPLITE_MAX +}; + +enum nfct_timeout_dccp_attr { + NFCT_TIMEOUT_ATTR_DCCP_REQUEST, + NFCT_TIMEOUT_ATTR_DCCP_RESPOND, + NFCT_TIMEOUT_ATTR_DCCP_PARTOPEN, + NFCT_TIMEOUT_ATTR_DCCP_OPEN, + NFCT_TIMEOUT_ATTR_DCCP_CLOSEREQ, + NFCT_TIMEOUT_ATTR_DCCP_CLOSING, + NFCT_TIMEOUT_ATTR_DCCP_TIMEWAIT, + NFCT_TIMEOUT_ATTR_DCCP_MAX +}; + +enum nfct_timeout_sctp_attr { + NFCT_TIMEOUT_ATTR_SCTP_CLOSED = 0, + NFCT_TIMEOUT_ATTR_SCTP_COOKIE_WAIT, + NFCT_TIMEOUT_ATTR_SCTP_COOKIE_ECHOED, + NFCT_TIMEOUT_ATTR_SCTP_ESTABLISHED, + NFCT_TIMEOUT_ATTR_SCTP_SHUTDOWN_SENT, + NFCT_TIMEOUT_ATTR_SCTP_SHUTDOWN_RECD, + NFCT_TIMEOUT_ATTR_SCTP_SHUTDOWN_ACK_SENT, + NFCT_TIMEOUT_ATTR_SCTP_MAX +}; + +enum nfct_timeout_icmp_attr { + NFCT_TIMEOUT_ATTR_ICMP = 0, + NFCT_TIMEOUT_ATTR_ICMP_MAX +}; + +enum nfct_timeout_icmpv6_attr { + NFCT_TIMEOUT_ATTR_ICMPV6 = 0, + NFCT_TIMEOUT_ATTR_ICMPV6_MAX +}; + +enum nfct_timeout_gre_attr { + NFCT_TIMEOUT_ATTR_GRE_UNREPLIED = 0, + NFCT_TIMEOUT_ATTR_GRE_REPLIED, + NFCT_TIMEOUT_ATTR_GRE_MAX +}; + +enum nfct_timeout_generic_attr { + NFCT_TIMEOUT_ATTR_GENERIC = 0, + NFCT_TIMEOUT_ATTR_GENERIC_MAX +}; + +int nfct_timeout_attr_set(struct nfct_timeout *t, uint32_t type, const void *data); +int nfct_timeout_attr_set_u8(struct nfct_timeout *t, uint32_t type, uint8_t data); +int nfct_timeout_attr_set_u16(struct nfct_timeout *t, uint32_t type, uint16_t data); +void nfct_timeout_attr_unset(struct nfct_timeout *t, uint32_t type); + +int nfct_timeout_policy_attr_set_u32(struct nfct_timeout *, uint32_t type, uint32_t data); +void nfct_timeout_policy_attr_unset(struct nfct_timeout *t, uint32_t type); + +struct nlmsghdr; + +struct nlmsghdr *nfct_timeout_nlmsg_build_hdr(char *buf, uint8_t cmd, uint16_t flags, uint32_t seq); +void nfct_timeout_nlmsg_build_payload(struct nlmsghdr *, struct nfct_timeout *); +int nfct_timeout_nlmsg_parse_payload(const struct nlmsghdr *nlh, struct nfct_timeout *); + +int nfct_timeout_snprintf(char *buf, size_t size, struct nfct_timeout *, unsigned int flags); + +#endif diff --git a/include/linux/Makefile.am b/include/linux/Makefile.am new file mode 100644 index 0000000..78be976 --- /dev/null +++ b/include/linux/Makefile.am @@ -0,0 +1 @@ +SUBDIR = netfilter diff --git a/include/linux/netfilter/Makefile.am b/include/linux/netfilter/Makefile.am new file mode 100644 index 0000000..998489a --- /dev/null +++ b/include/linux/netfilter/Makefile.am @@ -0,0 +1 @@ +noinst_HEADERS = nfnetlink.h nfnetlink_cttimeout.h nf_conntrack_tcp.h diff --git a/include/linux/netfilter/nf_conntrack_tcp.h b/include/linux/netfilter/nf_conntrack_tcp.h new file mode 100644 index 0000000..e59868a --- /dev/null +++ b/include/linux/netfilter/nf_conntrack_tcp.h @@ -0,0 +1,79 @@ +#ifndef _NF_CONNTRACK_TCP_H +#define _NF_CONNTRACK_TCP_H +/* TCP tracking. */ + +#include <linux/types.h> + +/* This is exposed to userspace (ctnetlink) */ +enum tcp_conntrack { + TCP_CONNTRACK_NONE, + TCP_CONNTRACK_SYN_SENT, + TCP_CONNTRACK_SYN_RECV, + TCP_CONNTRACK_ESTABLISHED, + TCP_CONNTRACK_FIN_WAIT, + TCP_CONNTRACK_CLOSE_WAIT, + TCP_CONNTRACK_LAST_ACK, + TCP_CONNTRACK_TIME_WAIT, + TCP_CONNTRACK_CLOSE, + TCP_CONNTRACK_LISTEN, /* obsolete */ +#define TCP_CONNTRACK_SYN_SENT2 TCP_CONNTRACK_LISTEN + TCP_CONNTRACK_MAX, + TCP_CONNTRACK_IGNORE, + TCP_CONNTRACK_RETRANS, + TCP_CONNTRACK_UNACK, + TCP_CONNTRACK_TIMEOUT_MAX +}; + +/* Window scaling is advertised by the sender */ +#define IP_CT_TCP_FLAG_WINDOW_SCALE 0x01 + +/* SACK is permitted by the sender */ +#define IP_CT_TCP_FLAG_SACK_PERM 0x02 + +/* This sender sent FIN first */ +#define IP_CT_TCP_FLAG_CLOSE_INIT 0x04 + +/* Be liberal in window checking */ +#define IP_CT_TCP_FLAG_BE_LIBERAL 0x08 + +/* Has unacknowledged data */ +#define IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED 0x10 + +/* The field td_maxack has been set */ +#define IP_CT_TCP_FLAG_MAXACK_SET 0x20 + +struct nf_ct_tcp_flags { + __u8 flags; + __u8 mask; +}; + +#ifdef __KERNEL__ + +struct ip_ct_tcp_state { + u_int32_t td_end; /* max of seq + len */ + u_int32_t td_maxend; /* max of ack + max(win, 1) */ + u_int32_t td_maxwin; /* max(win) */ + u_int32_t td_maxack; /* max of ack */ + u_int8_t td_scale; /* window scale factor */ + u_int8_t flags; /* per direction options */ +}; + +struct ip_ct_tcp { + struct ip_ct_tcp_state seen[2]; /* connection parameters per direction */ + u_int8_t state; /* state of the connection (enum tcp_conntrack) */ + /* For detecting stale connections */ + u_int8_t last_dir; /* Direction of the last packet (enum ip_conntrack_dir) */ + u_int8_t retrans; /* Number of retransmitted packets */ + u_int8_t last_index; /* Index of the last packet */ + u_int32_t last_seq; /* Last sequence number seen in dir */ + u_int32_t last_ack; /* Last sequence number seen in opposite dir */ + u_int32_t last_end; /* Last seq + len */ + u_int16_t last_win; /* Last window advertisement seen in dir */ + /* For SYN packets while we may be out-of-sync */ + u_int8_t last_wscale; /* Last window scaling factor seen */ + u_int8_t last_flags; /* Last flags set */ +}; + +#endif /* __KERNEL__ */ + +#endif /* _NF_CONNTRACK_TCP_H */ diff --git a/include/linux/netfilter/nfnetlink.h b/include/linux/netfilter/nfnetlink.h new file mode 100644 index 0000000..6fd1f0d --- /dev/null +++ b/include/linux/netfilter/nfnetlink.h @@ -0,0 +1,95 @@ +#ifndef _NFNETLINK_H +#define _NFNETLINK_H +#include <linux/types.h> +#include <linux/netfilter/nfnetlink_compat.h> + +enum nfnetlink_groups { + NFNLGRP_NONE, +#define NFNLGRP_NONE NFNLGRP_NONE + NFNLGRP_CONNTRACK_NEW, +#define NFNLGRP_CONNTRACK_NEW NFNLGRP_CONNTRACK_NEW + NFNLGRP_CONNTRACK_UPDATE, +#define NFNLGRP_CONNTRACK_UPDATE NFNLGRP_CONNTRACK_UPDATE + NFNLGRP_CONNTRACK_DESTROY, +#define NFNLGRP_CONNTRACK_DESTROY NFNLGRP_CONNTRACK_DESTROY + NFNLGRP_CONNTRACK_EXP_NEW, +#define NFNLGRP_CONNTRACK_EXP_NEW NFNLGRP_CONNTRACK_EXP_NEW + NFNLGRP_CONNTRACK_EXP_UPDATE, +#define NFNLGRP_CONNTRACK_EXP_UPDATE NFNLGRP_CONNTRACK_EXP_UPDATE + NFNLGRP_CONNTRACK_EXP_DESTROY, +#define NFNLGRP_CONNTRACK_EXP_DESTROY NFNLGRP_CONNTRACK_EXP_DESTROY + __NFNLGRP_MAX, +}; +#define NFNLGRP_MAX (__NFNLGRP_MAX - 1) + +/* General form of address family dependent message. + */ +struct nfgenmsg { + __u8 nfgen_family; /* AF_xxx */ + __u8 version; /* nfnetlink version */ + __be16 res_id; /* resource id */ +}; + +#define NFNETLINK_V0 0 + +/* netfilter netlink message types are split in two pieces: + * 8 bit subsystem, 8bit operation. + */ + +#define NFNL_SUBSYS_ID(x) ((x & 0xff00) >> 8) +#define NFNL_MSG_TYPE(x) (x & 0x00ff) + +/* No enum here, otherwise __stringify() trick of MODULE_ALIAS_NFNL_SUBSYS() + * won't work anymore */ +#define NFNL_SUBSYS_NONE 0 +#define NFNL_SUBSYS_CTNETLINK 1 +#define NFNL_SUBSYS_CTNETLINK_EXP 2 +#define NFNL_SUBSYS_QUEUE 3 +#define NFNL_SUBSYS_ULOG 4 +#define NFNL_SUBSYS_OSF 5 +#define NFNL_SUBSYS_IPSET 6 +#define NFNL_SUBSYS_ACCT 7 +#define NFNL_SUBSYS_CTNETLINK_TIMEOUT 8 +#define NFNL_SUBSYS_COUNT 9 + +#ifdef __KERNEL__ + +#include <linux/netlink.h> +#include <linux/capability.h> +#include <net/netlink.h> + +struct nfnl_callback { + int (*call)(struct sock *nl, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const cda[]); + int (*call_rcu)(struct sock *nl, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const cda[]); + const struct nla_policy *policy; /* netlink attribute policy */ + const u_int16_t attr_count; /* number of nlattr's */ +}; + +struct nfnetlink_subsystem { + const char *name; + __u8 subsys_id; /* nfnetlink subsystem ID */ + __u8 cb_count; /* number of callbacks */ + const struct nfnl_callback *cb; /* callback for individual types */ +}; + +extern int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n); +extern int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n); + +extern int nfnetlink_has_listeners(struct net *net, unsigned int group); +extern int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, + int echo, gfp_t flags); +extern int nfnetlink_set_err(struct net *net, u32 pid, u32 group, int error); +extern int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u_int32_t pid, int flags); + +extern void nfnl_lock(void); +extern void nfnl_unlock(void); + +#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \ + MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys)) + +#endif /* __KERNEL__ */ +#endif /* _NFNETLINK_H */ diff --git a/include/linux/netfilter/nfnetlink_cttimeout.h b/include/linux/netfilter/nfnetlink_cttimeout.h new file mode 100644 index 0000000..a2810a7 --- /dev/null +++ b/include/linux/netfilter/nfnetlink_cttimeout.h @@ -0,0 +1,114 @@ +#ifndef _CTTIMEOUT_NETLINK_H +#define _CTTIMEOUT_NETLINK_H +#include <linux/netfilter/nfnetlink.h> + +enum ctnl_timeout_msg_types { + IPCTNL_MSG_TIMEOUT_NEW, + IPCTNL_MSG_TIMEOUT_GET, + IPCTNL_MSG_TIMEOUT_DELETE, + + IPCTNL_MSG_TIMEOUT_MAX +}; + +enum ctattr_timeout { + CTA_TIMEOUT_UNSPEC, + CTA_TIMEOUT_NAME, + CTA_TIMEOUT_L3PROTO, + CTA_TIMEOUT_L4PROTO, + CTA_TIMEOUT_DATA, + CTA_TIMEOUT_USE, + __CTA_TIMEOUT_MAX +}; +#define CTA_TIMEOUT_MAX (__CTA_TIMEOUT_MAX - 1) + +enum ctattr_timeout_generic { + CTA_TIMEOUT_GENERIC_UNSPEC, + CTA_TIMEOUT_GENERIC_TIMEOUT, + __CTA_TIMEOUT_GENERIC_MAX +}; +#define CTA_TIMEOUT_GENERIC_MAX (__CTA_TIMEOUT_GENERIC_MAX - 1) + +enum ctattr_timeout_tcp { + CTA_TIMEOUT_TCP_UNSPEC, + CTA_TIMEOUT_TCP_SYN_SENT, + CTA_TIMEOUT_TCP_SYN_RECV, + CTA_TIMEOUT_TCP_ESTABLISHED, + CTA_TIMEOUT_TCP_FIN_WAIT, + CTA_TIMEOUT_TCP_CLOSE_WAIT, + CTA_TIMEOUT_TCP_LAST_ACK, + CTA_TIMEOUT_TCP_TIME_WAIT, + CTA_TIMEOUT_TCP_CLOSE, + CTA_TIMEOUT_TCP_SYN_SENT2, + CTA_TIMEOUT_TCP_RETRANS, + CTA_TIMEOUT_TCP_UNACK, + __CTA_TIMEOUT_TCP_MAX +}; +#define CTA_TIMEOUT_TCP_MAX (__CTA_TIMEOUT_TCP_MAX - 1) + +enum ctattr_timeout_udp { + CTA_TIMEOUT_UDP_UNSPEC, + CTA_TIMEOUT_UDP_UNREPLIED, + CTA_TIMEOUT_UDP_REPLIED, + __CTA_TIMEOUT_UDP_MAX +}; +#define CTA_TIMEOUT_UDP_MAX (__CTA_TIMEOUT_UDP_MAX - 1) + +enum ctattr_timeout_udplite { + CTA_TIMEOUT_UDPLITE_UNSPEC, + CTA_TIMEOUT_UDPLITE_UNREPLIED, + CTA_TIMEOUT_UDPLITE_REPLIED, + __CTA_TIMEOUT_UDPLITE_MAX +}; +#define CTA_TIMEOUT_UDPLITE_MAX (__CTA_TIMEOUT_UDPLITE_MAX - 1) + +enum ctattr_timeout_icmp { + CTA_TIMEOUT_ICMP_UNSPEC, + CTA_TIMEOUT_ICMP_TIMEOUT, + __CTA_TIMEOUT_ICMP_MAX +}; +#define CTA_TIMEOUT_ICMP_MAX (__CTA_TIMEOUT_ICMP_MAX - 1) + +enum ctattr_timeout_dccp { + CTA_TIMEOUT_DCCP_UNSPEC, + CTA_TIMEOUT_DCCP_REQUEST, + CTA_TIMEOUT_DCCP_RESPOND, + CTA_TIMEOUT_DCCP_PARTOPEN, + CTA_TIMEOUT_DCCP_OPEN, + CTA_TIMEOUT_DCCP_CLOSEREQ, + CTA_TIMEOUT_DCCP_CLOSING, + CTA_TIMEOUT_DCCP_TIMEWAIT, + __CTA_TIMEOUT_DCCP_MAX +}; +#define CTA_TIMEOUT_DCCP_MAX (__CTA_TIMEOUT_DCCP_MAX - 1) + +enum ctattr_timeout_sctp { + CTA_TIMEOUT_SCTP_UNSPEC, + CTA_TIMEOUT_SCTP_CLOSED, + CTA_TIMEOUT_SCTP_COOKIE_WAIT, + CTA_TIMEOUT_SCTP_COOKIE_ECHOED, + CTA_TIMEOUT_SCTP_ESTABLISHED, + CTA_TIMEOUT_SCTP_SHUTDOWN_SENT, + CTA_TIMEOUT_SCTP_SHUTDOWN_RECD, + CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT, + __CTA_TIMEOUT_SCTP_MAX +}; +#define CTA_TIMEOUT_SCTP_MAX (__CTA_TIMEOUT_SCTP_MAX - 1) + +enum ctattr_timeout_icmpv6 { + CTA_TIMEOUT_ICMPV6_UNSPEC, + CTA_TIMEOUT_ICMPV6_TIMEOUT, + __CTA_TIMEOUT_ICMPV6_MAX +}; +#define CTA_TIMEOUT_ICMPV6_MAX (__CTA_TIMEOUT_ICMPV6_MAX - 1) + +enum ctattr_timeout_gre { + CTA_TIMEOUT_GRE_UNSPEC, + CTA_TIMEOUT_GRE_UNREPLIED, + CTA_TIMEOUT_GRE_REPLIED, + __CTA_TIMEOUT_GRE_MAX +}; +#define CTA_TIMEOUT_GRE_MAX (__CTA_TIMEOUT_GRE_MAX - 1) + +#define CTNL_TIMEOUT_NAME_MAX 32 + +#endif diff --git a/libnetfilter_cttimeout.pc.in b/libnetfilter_cttimeout.pc.in new file mode 100644 index 0000000..204ff7b --- /dev/null +++ b/libnetfilter_cttimeout.pc.in @@ -0,0 +1,15 @@ +# libnetfilter_cttimeout pkg-config file + +prefix=@prefix@ +exec_prefix=@exec_prefix@ +libdir=@libdir@ +includedir=@includedir@ + +Name: libnetfilter_cttimeout +Description: Netfilter extended cttimeout infrastructure library +URL: http://netfilter.org/projects/libnetfilter_cttimeout/ +Version: @VERSION@ +Requires: +Conflicts: +Libs: -L${libdir} -lnetfilter_cttimeout +Cflags: -I${includedir} diff --git a/m4/.gitignore b/m4/.gitignore new file mode 100644 index 0000000..64d9bbc --- /dev/null +++ b/m4/.gitignore @@ -0,0 +1,2 @@ +/libtool.m4 +/lt*.m4 diff --git a/m4/gcc4_visibility.m4 b/m4/gcc4_visibility.m4 new file mode 100644 index 0000000..214d3f3 --- /dev/null +++ b/m4/gcc4_visibility.m4 @@ -0,0 +1,21 @@ + +# GCC 4.x -fvisibility=hidden + +AC_DEFUN([CHECK_GCC_FVISIBILITY], [ + AC_LANG_PUSH([C]) + saved_CFLAGS="$CFLAGS" + CFLAGS="$saved_CFLAGS -fvisibility=hidden" + AC_CACHE_CHECK([whether compiler accepts -fvisibility=hidden], + [ac_cv_fvisibility_hidden], AC_COMPILE_IFELSE( + [AC_LANG_SOURCE()], + [ac_cv_fvisibility_hidden=yes], + [ac_cv_fvisibility_hidden=no] + )) + if test "$ac_cv_fvisibility_hidden" = "yes"; then + AC_DEFINE([HAVE_VISIBILITY_HIDDEN], [1], + [True if compiler supports -fvisibility=hidden]) + AC_SUBST([GCC_FVISIBILITY_HIDDEN], [-fvisibility=hidden]) + fi + CFLAGS="$saved_CFLAGS" + AC_LANG_POP([C]) +]) diff --git a/src/Makefile.am b/src/Makefile.am new file mode 100644 index 0000000..460feee --- /dev/null +++ b/src/Makefile.am @@ -0,0 +1,8 @@ +include $(top_srcdir)/Make_global.am +lib_LTLIBRARIES = libnetfilter_cttimeout.la + +libnetfilter_cttimeout_la_LIBADD = ${LIBMNL_LIBS} +libnetfilter_cttimeout_la_LDFLAGS = -Wl,--version-script=$(srcdir)/libnetfilter_cttimeout.map -version-info $(LIBVERSION) +libnetfilter_cttimeout_la_SOURCES = libnetfilter_cttimeout.c \ + libnetfilter_cttimeout.map \ + internal.h diff --git a/src/internal.h b/src/internal.h new file mode 100644 index 0000000..3a88d1a --- /dev/null +++ b/src/internal.h @@ -0,0 +1,12 @@ +#ifndef INTERNAL_H +#define INTERNAL_H 1 + +#include "config.h" +#ifdef HAVE_VISIBILITY_HIDDEN +# define __visible __attribute__((visibility("default"))) +# define EXPORT_SYMBOL(x) typeof(x) (x) __visible +#else +# define EXPORT_SYMBOL +#endif + +#endif diff --git a/src/libnetfilter_cttimeout.c b/src/libnetfilter_cttimeout.c new file mode 100644 index 0000000..2f1ba79 --- /dev/null +++ b/src/libnetfilter_cttimeout.c @@ -0,0 +1,555 @@ +/* + * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org> + * (C) 2012 by Vyatta Inc. <http://www.vyatta.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published + * by the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ +#include "internal.h" + +#include <time.h> +#include <endian.h> +#include <stdlib.h> +#include <string.h> +#include <netinet/in.h> + +#include <libmnl/libmnl.h> +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_cttimeout.h> + +#include <libnetfilter_cttimeout/libnetfilter_cttimeout.h> + +static char *tcp_state_to_name[] = { + [NFCT_TIMEOUT_ATTR_TCP_SYN_SENT] = "SYN_SENT", + [NFCT_TIMEOUT_ATTR_TCP_SYN_RECV] = "SYN_RECV", + [NFCT_TIMEOUT_ATTR_TCP_ESTABLISHED] = "ESTABLISHED", + [NFCT_TIMEOUT_ATTR_TCP_FIN_WAIT] = "FIN_WAIT", + [NFCT_TIMEOUT_ATTR_TCP_CLOSE_WAIT] = "CLOSE_WAIT", + [NFCT_TIMEOUT_ATTR_TCP_LAST_ACK] = "LAST_ACK", + [NFCT_TIMEOUT_ATTR_TCP_TIME_WAIT] = "TIME_WAIT", + [NFCT_TIMEOUT_ATTR_TCP_CLOSE] = "CLOSE", + [NFCT_TIMEOUT_ATTR_TCP_SYN_SENT2] = "SYN_SENT2", + [NFCT_TIMEOUT_ATTR_TCP_RETRANS] = "RETRANS", + [NFCT_TIMEOUT_ATTR_TCP_UNACK] = "UNACKNOWLEDGED", +}; + +static char *generic_state_to_name[] = { + [NFCT_TIMEOUT_ATTR_GENERIC] = "TIMEOUT", +}; + +static char *udp_state_to_name[] = { + [NFCT_TIMEOUT_ATTR_UDP_UNREPLIED] = "UNREPLIED", + [NFCT_TIMEOUT_ATTR_UDP_REPLIED] = "REPLIED", +}; + +static char *sctp_state_to_name[] = { + [NFCT_TIMEOUT_ATTR_SCTP_CLOSED] = "CLOSED", + [NFCT_TIMEOUT_ATTR_SCTP_COOKIE_WAIT] = "COOKIE_WAIT", + [NFCT_TIMEOUT_ATTR_SCTP_COOKIE_ECHOED] = "COOKIE_ECHOED", + [NFCT_TIMEOUT_ATTR_SCTP_ESTABLISHED] = "ESTABLISHED", + [NFCT_TIMEOUT_ATTR_SCTP_SHUTDOWN_SENT] = "SHUTDOWN_SENT", + [NFCT_TIMEOUT_ATTR_SCTP_SHUTDOWN_RECD] = "SHUTDOWN_RECD", + [NFCT_TIMEOUT_ATTR_SCTP_SHUTDOWN_ACK_SENT] = "SHUTDOWN_ACK_SENT", +}; + +static char *dccp_state_to_name[] = { + [NFCT_TIMEOUT_ATTR_DCCP_REQUEST] = "REQUEST", + [NFCT_TIMEOUT_ATTR_DCCP_RESPOND] = "RESPOND", + [NFCT_TIMEOUT_ATTR_DCCP_PARTOPEN] = "PARTOPEN", + [NFCT_TIMEOUT_ATTR_DCCP_OPEN] = "OPEN", + [NFCT_TIMEOUT_ATTR_DCCP_CLOSEREQ] = "CLOSEREQ", + [NFCT_TIMEOUT_ATTR_DCCP_CLOSING] = "CLOSING", + [NFCT_TIMEOUT_ATTR_DCCP_TIMEWAIT] = "TIMEWAIT", +}; + +static char *icmp_state_to_name[] = { + [NFCT_TIMEOUT_ATTR_ICMP] = "TIMEOUT", +}; + +static struct { + uint32_t nlattr_max; + uint32_t attr_max; + char **state_to_name; +} timeout_protocol[IPPROTO_MAX] = { + [IPPROTO_ICMP] = { + .nlattr_max = __CTA_TIMEOUT_ICMP_MAX, + .attr_max = NFCT_TIMEOUT_ATTR_ICMP_MAX, + .state_to_name = icmp_state_to_name, + }, + [IPPROTO_TCP] = { + .nlattr_max = __CTA_TIMEOUT_TCP_MAX, + .attr_max = NFCT_TIMEOUT_ATTR_TCP_MAX, + .state_to_name = tcp_state_to_name, + }, + [IPPROTO_UDP] = { + .nlattr_max = __CTA_TIMEOUT_UDP_MAX, + .attr_max = NFCT_TIMEOUT_ATTR_UDP_MAX, + .state_to_name = udp_state_to_name, + }, + [IPPROTO_GRE] = { + .nlattr_max = __CTA_TIMEOUT_GRE_MAX, + .attr_max = NFCT_TIMEOUT_ATTR_GRE_MAX, + .state_to_name = udp_state_to_name, + }, + [IPPROTO_SCTP] = { + .nlattr_max = __CTA_TIMEOUT_SCTP_MAX, + .attr_max = NFCT_TIMEOUT_ATTR_SCTP_MAX, + .state_to_name = sctp_state_to_name, + }, + [IPPROTO_DCCP] = { + .nlattr_max = __CTA_TIMEOUT_DCCP_MAX, + .attr_max = NFCT_TIMEOUT_ATTR_DCCP_MAX, + .state_to_name = dccp_state_to_name, + }, + [IPPROTO_UDPLITE] = { + .nlattr_max = __CTA_TIMEOUT_UDPLITE_MAX, + .attr_max = NFCT_TIMEOUT_ATTR_UDPLITE_MAX, + .state_to_name = udp_state_to_name, + }, + /* add your new supported protocol tracker here. */ + [IPPROTO_RAW] = { + .nlattr_max = __CTA_TIMEOUT_GENERIC_MAX, + .attr_max = NFCT_TIMEOUT_ATTR_GENERIC_MAX, + .state_to_name = generic_state_to_name, + }, +}; + + +struct nfct_timeout { + char name[32]; /* object name. */ + uint16_t l3num; /* AF_INET, ... */ + uint8_t l4num; /* UDP, TCP, ... */ + uint16_t attrset; + + uint32_t *timeout; /* array of timeout. */ + uint16_t polset; +}; + +/** + * \defgroup nfcttimeout Accounting object handling + * @{ + */ + +/** + * nfct_timeout_alloc - allocate a new conntrack timeout object + * \param protonum layer 4 protocol number (use IPPROTO_* constants) + * + * You can use IPPROTO_MAX to set the timeout for the generic protocol tracker. + * + * In case of success, this function returns a valid pointer, otherwise NULL + * s returned and errno is appropriately set. + */ +struct nfct_timeout *nfct_timeout_alloc(void) +{ + struct nfct_timeout *t; + + t = calloc(1, sizeof(struct nfct_timeout)); + if (t == NULL) + return NULL; + + return t; +} +EXPORT_SYMBOL(nfct_timeout_alloc); + +/** + * nfct_timeout_free - release one conntrack timeout object + * \param nfct_timeout pointer to the conntrack timeout object + */ +void nfct_timeout_free(struct nfct_timeout *t) +{ + if (t->timeout) + free(t->timeout); + free(t); +} +EXPORT_SYMBOL(nfct_timeout_free); + +/** + * nfct_timeout_attr_set - set one attribute of the conntrack timeout object + * \param nfct_timeout pointer to the conntrack timeout object + * \param type attribute type you want to set + * \param data pointer to data that will be used to set this attribute + */ +int +nfct_timeout_attr_set(struct nfct_timeout *t, uint32_t type, const void *data) +{ + switch(type) { + case NFCT_TIMEOUT_ATTR_NAME: + strncpy(t->name, data, 32); + break; + case NFCT_TIMEOUT_ATTR_L3PROTO: + t->l3num = *((uint16_t *) data); + break; + case NFCT_TIMEOUT_ATTR_L4PROTO: + t->l4num = *((uint8_t *) data); + break; + /* NFCT_TIMEOUT_ATTR_POLICY is set by nfct_timeout_policy_attr_set. */ + } + t->attrset |= (1 << type); + return 0; +} +EXPORT_SYMBOL(nfct_timeout_attr_set); + +/** + * nfct_timeout_attr_set_u8 - set one attribute of the conntrack timeout object + * \param nfct_timeout pointer to the conntrack timeout object + * \param type attribute type you want to set + * \param data pointer to data that will be used to set this attribute + */ +int +nfct_timeout_attr_set_u8(struct nfct_timeout *t, uint32_t type, uint8_t data) +{ + return nfct_timeout_attr_set(t, type, &data); +} +EXPORT_SYMBOL(nfct_timeout_attr_set_u8); + +/** + * nfct_timeout_attr_set_u16 - set one attribute of the conntrack timeout object + * \param nfct_timeout pointer to the conntrack timeout object + * \param type attribute type you want to set + * \param data pointer to data that will be used to set this attribute + */ +int +nfct_timeout_attr_set_u16(struct nfct_timeout *t, uint32_t type, uint16_t data) +{ + return nfct_timeout_attr_set(t, type, &data); +} +EXPORT_SYMBOL(nfct_timeout_attr_set_u16); + +void nfct_timeout_attr_unset(struct nfct_timeout *t, uint32_t type) +{ + t->attrset &= ~(1 << type); +} +EXPORT_SYMBOL(nfct_timeout_attr_unset); + +/** + * nfct_timeout_policy_attr_set_u32 - set one attribute of the policy + * \param nfct_timeout pointer to the conntrack timeout object + * \param type attribute type you want to set + * \param data data that will be used to set this attribute + */ +int +nfct_timeout_policy_attr_set_u32(struct nfct_timeout *t, + uint32_t type, uint32_t data) +{ + size_t timeout_array_size; + + /* Layer 4 protocol needs to be already set. */ + if (!(t->attrset & (1 << NFCT_TIMEOUT_ATTR_L4PROTO))) + return -1; + + if (t->timeout == NULL) { + /* if not supported, default to generic protocol tracker. */ + if (timeout_protocol[t->l4num].attr_max != 0) { + timeout_array_size = + sizeof(uint32_t) * + timeout_protocol[t->l4num].attr_max; + } else { + timeout_array_size = + sizeof(uint32_t) * + timeout_protocol[IPPROTO_RAW].attr_max; + } + t->timeout = calloc(1, timeout_array_size); + if (t->timeout == NULL) + return -1; + } + + /* this state does not exists in this protocol tracker. */ + if (type > timeout_protocol[t->l4num].attr_max) + return -1; + + t->timeout[type] = data; + t->polset |= (1 << type); + + if (!(t->attrset & (1 << NFCT_TIMEOUT_ATTR_POLICY))) + t->attrset |= (1 << NFCT_TIMEOUT_ATTR_POLICY); + + return 0; +} +EXPORT_SYMBOL(nfct_timeout_policy_attr_set_u32); + +/** + * nfct_timeout_policy_attr_unset - unset one attribute of the policy + * \param nfct_timeout pointer to the conntrack timeout object + * \param type attribute type you want to set + */ +void nfct_timeout_policy_attr_unset(struct nfct_timeout *t, uint32_t type) +{ + t->attrset &= ~(1 << type); +} +EXPORT_SYMBOL(nfct_timeout_policy_attr_unset); + +/** + * nfct_timeout_snprintf - print conntrack timeout object into one buffer + * \param buf: pointer to buffer that is used to print the object + * \param size: size of the buffer (or remaining room in it). + * \param nfct_timeout: pointer to a valid conntrack timeout object. + * \param flags: output flags (CTA_TIMEOUT_SNPRINTF_F_FULL). + * + * This function returns -1 in case that some mandatory attributes are + * missing. On sucess, it returns 0. + */ +int nfct_timeout_snprintf(char *buf, size_t size, struct nfct_timeout *t, + unsigned int flags) +{ + int ret = 0; + unsigned int offset = 0; + + if (t->attrset & (1 << NFCT_TIMEOUT_ATTR_NAME)) { + ret = snprintf(buf+offset, size, ".%s = {\n", t->name); + offset += ret; + size -= ret; + } + if (t->attrset & (1 << NFCT_TIMEOUT_ATTR_L3PROTO)) { + ret = snprintf(buf+offset, size, "\t.l3proto = %u,\n", + t->l3num); + offset += ret; + size -= ret; + } + if (t->attrset & (1 << NFCT_TIMEOUT_ATTR_L4PROTO)) { + ret = snprintf(buf+offset, size, "\t.l4proto = %u,\n", + t->l4num); + offset += ret; + size -= ret; + } + if (t->attrset & (1 << NFCT_TIMEOUT_ATTR_POLICY)) { + uint8_t l4num = t->l4num; + int i; + + /* default to generic protocol tracker. */ + if (timeout_protocol[t->l4num].attr_max == 0) + l4num = IPPROTO_RAW; + + ret = snprintf(buf+offset, size, "\t.policy = {\n"); + offset += ret; + size -= ret; + + for (i=0; i<timeout_protocol[l4num].attr_max; i++) { + const char *state_name = + timeout_protocol[l4num].state_to_name[i][0] ? + timeout_protocol[l4num].state_to_name[i] : + "UNKNOWN"; + + ret = snprintf(buf+offset, size, + "\t\t.%s = %u,\n", state_name, t->timeout[i]); + offset += ret; + size -= ret; + } + + ret = snprintf(buf+offset, size, "\t},\n"); + offset += ret; + size -= ret; + } + ret = snprintf(buf+offset, size, "};"); + offset += ret; + size -= ret; + + buf[offset]='\0'; + + return ret; +} +EXPORT_SYMBOL(nfct_timeout_snprintf); + +/** + * @} + */ + +/** + * \defgroup nlmsg Netlink message helper functions + * @{ + */ + +/** + * nfct_timeout_nlmsg_build_hdr - build netlink message header for ct timeout + * \param buf: buffer where this function outputs the netlink message. + * \param cmd: nfct_timeout nfnetlink command. + * \param flags: netlink flags. + * \param seq: sequence number for this message. + * + * Possible commands: + * - CTNL_MSG_TIMEOUT_NEW: new conntrack timeout object. + * - CTNL_MSG_TIMEOUT_GET: get conntrack timeout object. + * - CTNL_MSG_TIMEOUT_DEL: delete conntrack timeout object. + */ +struct nlmsghdr * +nfct_timeout_nlmsg_build_hdr(char *buf, uint8_t cmd, + uint16_t flags, uint32_t seq) +{ + struct nlmsghdr *nlh; + struct nfgenmsg *nfh; + + nlh = mnl_nlmsg_put_header(buf); + nlh->nlmsg_type = (NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8) | cmd; + nlh->nlmsg_flags = NLM_F_REQUEST | flags; + nlh->nlmsg_seq = seq; + + nfh = mnl_nlmsg_put_extra_header(nlh, sizeof(struct nfgenmsg)); + nfh->nfgen_family = AF_UNSPEC; + nfh->version = NFNETLINK_V0; + nfh->res_id = 0; + + return nlh; +} +EXPORT_SYMBOL(nfct_timeout_nlmsg_build_hdr); + +/** + * nfct_timeout_nlmsg_build_payload - build payload from ct timeout object + * \param nlh: netlink message that you want to use to add the payload. + * \param t: pointer to a conntrack timeout object + */ +void +nfct_timeout_nlmsg_build_payload(struct nlmsghdr *nlh, struct nfct_timeout *t) +{ + int i; + struct nlattr *nest; + + if (t->attrset & (1 << NFCT_TIMEOUT_ATTR_NAME)) + mnl_attr_put_strz(nlh, CTA_TIMEOUT_NAME, t->name); + + if (t->attrset & (1 << NFCT_TIMEOUT_ATTR_L3PROTO)) + mnl_attr_put_u16(nlh, CTA_TIMEOUT_L3PROTO, htons(t->l3num)); + + if (t->attrset & (1 << NFCT_TIMEOUT_ATTR_L4PROTO)) + mnl_attr_put_u8(nlh, CTA_TIMEOUT_L4PROTO, t->l4num); + + if (t->attrset & (1 << NFCT_TIMEOUT_ATTR_POLICY)) { + nest = mnl_attr_nest_start(nlh, CTA_TIMEOUT_DATA); + + for (i=0; i<timeout_protocol[t->l4num].attr_max; i++) { + if (t->polset & (1 << i)) { + mnl_attr_put_u32(nlh, i+1, + htonl(t->timeout[i])); + } + } + mnl_attr_nest_end(nlh, nest); + } + +} +EXPORT_SYMBOL(nfct_timeout_nlmsg_build_payload); + +static int +timeout_nlmsg_parse_attr_cb(const struct nlattr *attr, void *data) +{ + const struct nlattr **tb = data; + int type = mnl_attr_get_type(attr); + + if (mnl_attr_type_valid(attr, CTA_TIMEOUT_MAX) < 0) + return MNL_CB_OK; + + switch(type) { + case CTA_TIMEOUT_NAME: + if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + case CTA_TIMEOUT_L3PROTO: + if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + case CTA_TIMEOUT_L4PROTO: + if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + case CTA_TIMEOUT_DATA: + if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + } + tb[type] = attr; + return MNL_CB_OK; +} + +struct _container_policy_cb { + int nlattr_max; + void *tb; +}; + +static int +parse_timeout_attr_policy_cb(const struct nlattr *attr, void *data) +{ + struct _container_policy_cb *data_cb = data; + const struct nlattr **tb = data_cb->tb; + int type = mnl_attr_get_type(attr); + + if (mnl_attr_type_valid(attr, data_cb->nlattr_max) < 0) + return MNL_CB_OK; + + if (type <= data_cb->nlattr_max) { + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + tb[type] = attr; + } + return MNL_CB_OK; +} + +static void +timeout_parse_attr_data(struct nfct_timeout *t, const struct nlattr *nest) +{ + int nlattr_max = timeout_protocol[t->l4num].nlattr_max; + struct nlattr *tb[nlattr_max]; + struct _container_policy_cb cnt = { + .nlattr_max = nlattr_max, + .tb = tb, + }; + int i; + + memset(tb, 0, sizeof(struct nlattr *) * nlattr_max); + + mnl_attr_parse_nested(nest, parse_timeout_attr_policy_cb, &cnt); + + for (i=1; i<nlattr_max; i++) { + if (tb[i]) { + nfct_timeout_policy_attr_set_u32(t, i-1, + ntohl(mnl_attr_get_u32(tb[i]))); + } + } +} + +/** + * nfct_timeout_nlmsg_parse_payload - set timeout object attributes from message + * \param nlh: netlink message that you want to use to add the payload. + * \param nfct_timeout: pointer to a conntrack timeout object + * + * This function returns -1 in case that some mandatory attributes are + * missing. On sucess, it returns 0. + */ +int +nfct_timeout_nlmsg_parse_payload(const struct nlmsghdr *nlh, + struct nfct_timeout *t) +{ + struct nlattr *tb[CTA_TIMEOUT_MAX+1] = {}; + struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh); + + mnl_attr_parse(nlh, sizeof(*nfg), timeout_nlmsg_parse_attr_cb, tb); + if (tb[CTA_TIMEOUT_NAME]) { + nfct_timeout_attr_set(t, NFCT_TIMEOUT_ATTR_NAME, + mnl_attr_get_str(tb[CTA_TIMEOUT_NAME])); + } + if (tb[CTA_TIMEOUT_L3PROTO]) { + nfct_timeout_attr_set_u16(t, NFCT_TIMEOUT_ATTR_L3PROTO, + ntohs(mnl_attr_get_u16(tb[CTA_TIMEOUT_L3PROTO]))); + } + if (tb[CTA_TIMEOUT_L4PROTO]) { + nfct_timeout_attr_set_u8(t, NFCT_TIMEOUT_ATTR_L4PROTO, + mnl_attr_get_u8(tb[CTA_TIMEOUT_L4PROTO])); + } + if (tb[CTA_TIMEOUT_DATA]) { + timeout_parse_attr_data(t, tb[CTA_TIMEOUT_DATA]); + } + return 0; +} +EXPORT_SYMBOL(nfct_timeout_nlmsg_parse_payload); + +/** + * @} + */ diff --git a/src/libnetfilter_cttimeout.map b/src/libnetfilter_cttimeout.map new file mode 100644 index 0000000..a4417cc --- /dev/null +++ b/src/libnetfilter_cttimeout.map @@ -0,0 +1,21 @@ +LIBNETFILTER_CTTIMEOUT_1.0 { +global: + nfct_timeout_alloc; + nfct_timeout_free; + nfct_timeout_attr_set; + nfct_timeout_attr_set_u8; + nfct_timeout_attr_set_u16; + nfct_timeout_attr_unset; + nfct_timeout_policy_attr_set_u32; + nfct_timeout_policy_unset; + nfct_timeout_nlmsg_build_hdr; + nfct_timeout_nlmsg_build_payload; + nfct_timeout_nlmsg_parse_payload; + nfct_timeout_snprintf; + +local: *; +}; + +#LIBNETFILTER_CTTIMEOUT_1.1 { +# _my_new_func; +#} LIBNETFILTER_CTTIMEOUT_1.0; |