From: Pablo Neira <pablo@xxxxxxxxxxxxx>
At compilation time, you have to pass this option.
# ./configure --with-xtables
And libxtables needs to be installed in your system.
This patch allows to list a ruleset containing xt extensions loaded
through iptables-compat-restore tool.
Example:
$ cat iptables-save
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -p tcp -m multiport --dports 80,81 -j REJECT
COMMIT
$ sudo iptables-compat-restore iptables-save
$ sudo nft list chain filter INPUT
table ip filter {
chain INPUT {
type filter hook input priority 0; policy accept;
ip protocol tcp tcp dport { 80,81} counter packets 0 bytes 0 reject
}
}
A translation of the extension is shown if this is available. In other
case, match or target definition is preceded by a hash:
$ sudo nft list chain mangle POSTROUTING
table ip mangle {
chain POSTROUTING {
type filter hook postrouting priority -150; policy accept;
ip protocol tcp tcp dport 80 counter packets 0 bytes 0 # CLASSIFY set 20:10
^^^
}
}
If the whole ruleset is translatable, the users can (re)load it using
"nft -f" and get nft native support for all their rules.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Pablo M. Bermudo Garay <pablombg@xxxxxxxxx>
---
New version of the original work made by Arturo and Pablo.
Work in progress:
- Fix extra space between matches.
- Fix escaped quotation marks issue.
- Mark rules using xt compat support.
configure.ac | 13 +-
include/linux/netfilter/nf_tables_compat.h | 38 ++
include/statement.h | 34 ++
include/xt.h | 52 +++
src/Makefile.am | 8 +
src/evaluate.c | 3 +
src/netlink_delinearize.c | 6 +
src/statement.c | 25 ++
src/xt.c | 575 +++++++++++++++++++++++++++++
9 files changed, 753 insertions(+), 1 deletion(-)
create mode 100644 include/linux/netfilter/nf_tables_compat.h
create mode 100644 include/xt.h
create mode 100644 src/xt.c
diff --git a/configure.ac b/configure.ac
index 3d7708a..39f0a26 100644
--- a/configure.ac
+++ b/configure.ac
@@ -92,6 +92,16 @@ AC_DEFINE([HAVE_LIBREADLINE], [1], [])
AC_SUBST(with_cli)
AM_CONDITIONAL([BUILD_CLI], [test "x$with_cli" != xno])
+AC_ARG_WITH([xtables], [AS_HELP_STRING([--with-xtables],
+ [Use libxtables for iptables interaction)])],
+ [with_libxtables=yes], [with_libxtables=no])
+AS_IF([test "x$with_libxtables" != xno], [
+PKG_CHECK_MODULES([XTABLES], [xtables >= 1.4.21])
+AC_DEFINE([HAVE_LIBXTABLES], [1], [0])
+])
+AC_SUBST(with_libxtables)
+AM_CONDITIONAL([BUILD_XTABLES], [test "x$with_libxtables" == xyes])
+
# Checks for header files.
AC_HEADER_STDC
AC_HEADER_ASSERT
@@ -140,4 +150,5 @@ echo "
nft configuration:
cli support: ${with_cli}
enable debugging: ${with_debug}
- use mini-gmp: ${with_mini_gmp}"
+ use mini-gmp: ${with_mini_gmp}
+ libxtables support: ${with_libxtables}"
diff --git a/include/linux/netfilter/nf_tables_compat.h b/include/linux/netfilter/nf_tables_compat.h
new file mode 100644
index 0000000..8310f5f
--- /dev/null
+++ b/include/linux/netfilter/nf_tables_compat.h
@@ -0,0 +1,38 @@
+#ifndef _NFT_COMPAT_NFNETLINK_H_
+#define _NFT_COMPAT_NFNETLINK_H_
+
+enum nft_target_attributes {
+ NFTA_TARGET_UNSPEC,
+ NFTA_TARGET_NAME,
+ NFTA_TARGET_REV,
+ NFTA_TARGET_INFO,
+ __NFTA_TARGET_MAX
+};
+#define NFTA_TARGET_MAX (__NFTA_TARGET_MAX - 1)
+
+enum nft_match_attributes {
+ NFTA_MATCH_UNSPEC,
+ NFTA_MATCH_NAME,
+ NFTA_MATCH_REV,
+ NFTA_MATCH_INFO,
+ __NFTA_MATCH_MAX
+};
+#define NFTA_MATCH_MAX (__NFTA_MATCH_MAX - 1)
+
+#define NFT_COMPAT_NAME_MAX 32
+
+enum {
+ NFNL_MSG_COMPAT_GET,
+ NFNL_MSG_COMPAT_MAX
+};
+
+enum {
+ NFTA_COMPAT_UNSPEC = 0,
+ NFTA_COMPAT_NAME,
+ NFTA_COMPAT_REV,
+ NFTA_COMPAT_TYPE,
+ __NFTA_COMPAT_MAX,
+};
+#define NFTA_COMPAT_MAX (__NFTA_COMPAT_MAX - 1)
+
+#endif
diff --git a/include/statement.h b/include/statement.h
index e9313ca..1b21551 100644
--- a/include/statement.h
+++ b/include/statement.h
@@ -148,6 +148,37 @@ struct flow_stmt {
extern struct stmt *flow_stmt_alloc(const struct location *loc);
/**
+ * enum nft_xt_type - xtables statement types
+ *
+ * @NFT_XT_MATCH: match
+ * @NFT_XT_TARGET: target
+ * @NFT_XT_WATCHER: watcher (only for the bridge family)
+ */
+enum nft_xt_type {
+ NFT_XT_MATCH = 0,
+ NFT_XT_TARGET,
+ NFT_XT_WATCHER,
+ NFT_XT_MAX
+};
+
+struct xtables_match;
+struct xtables_target;
+
+struct xt_stmt {
+ const char *name;
+ enum nft_xt_type type;
+ uint32_t proto;
+ union {
+ struct xtables_match *match;
+ struct xtables_target *target;
+ };
+ const char *opts;
+ void *entry;
+};
+
+extern struct stmt *xt_stmt_alloc(const struct location *loc);
+
+/**
* enum stmt_types - statement types
*
* @STMT_INVALID: uninitialised
@@ -168,6 +199,7 @@ extern struct stmt *flow_stmt_alloc(const struct location *loc);
* @STMT_SET: set statement
* @STMT_DUP: dup statement
* @STMT_FWD: forward statement
+ * @STMT_XT: XT statement
*/
enum stmt_types {
STMT_INVALID,
@@ -188,6 +220,7 @@ enum stmt_types {
STMT_SET,
STMT_DUP,
STMT_FWD,
+ STMT_XT,
};
/**
@@ -243,6 +276,7 @@ struct stmt {
struct set_stmt set;
struct dup_stmt dup;
struct fwd_stmt fwd;
+ struct xt_stmt xt;
};
};
diff --git a/include/xt.h b/include/xt.h
new file mode 100644
index 0000000..b19195b
--- /dev/null
+++ b/include/xt.h
@@ -0,0 +1,52 @@
+#ifndef _NFT_XT_H_
+#define _NFT_XT_H_
+
+struct netlink_linearize_ctx;
+struct netlink_parse_ctx;
+struct nftnl_expr;
+struct rule_pp_ctx;
+struct rule;
+
+#ifdef HAVE_LIBXTABLES
+void xt_stmt_xlate(const struct stmt *stmt);
+void xt_stmt_release(const struct stmt *stmt);
+
+int stmt_evaluate_xt(struct eval_ctx *ctx, struct stmt *stmt);
+
+void netlink_gen_xt_stmt(struct netlink_linearize_ctx *ctx,
+ const struct stmt *stmt);
+
+void netlink_parse_target(struct netlink_parse_ctx *ctx,
+ const struct location *loc,
+ const struct nftnl_expr *nle);
+void netlink_parse_match(struct netlink_parse_ctx *ctx,
+ const struct location *loc,
+ const struct nftnl_expr *nle);
+void stmt_xt_postprocess(struct rule_pp_ctx *rctx, struct stmt *stmt,
+ struct rule *rule);
+#else
+static inline void xt_stmt_xlate(const struct stmt *stmt) {}
+static inline void xt_stmt_release(const struct stmt *stmt) {}
+
+#include <erec.h>
+
+static inline int stmt_evaluate_xt(struct eval_ctx *ctx, struct stmt *stmt)
+{
+ return stmt_error(ctx, stmt, "this build does not support xtables");
+}
+
+static inline void netlink_gen_xt_stmt(struct netlink_linearize_ctx *ctx,
+ const struct stmt *stmt) {}
+
+static inline void netlink_parse_target(struct netlink_parse_ctx *ctx,
+ const struct location *loc,
+ const struct nftnl_expr *nle) {}
+static inline void netlink_parse_match(struct netlink_parse_ctx *ctx,
+ const struct location *loc,
+ const struct nftnl_expr *nle) {}
+static inline void stmt_xt_postprocess(struct rule_pp_ctx *rctx,
+ struct stmt *stmt, struct rule *rule) {}
+
+#endif
+
+#endif /* _NFT_XT_H_ */
diff --git a/src/Makefile.am b/src/Makefile.am
index fd63219..8c59449 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -8,6 +8,9 @@ AM_CPPFLAGS += -DDEFAULT_INCLUDE_PATH="\"${sysconfdir}\"" \
if BUILD_DEBUG
AM_CPPFLAGS += -g -DDEBUG
endif
+if BUILD_XTABLES
+AM_CPPFLAGS += ${XTABLES_CFLAGS}
+endif
AM_CFLAGS = -Wall \
-Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations \
@@ -59,3 +62,8 @@ nft_SOURCES += mini-gmp.c
endif
nft_LDADD = ${LIBMNL_LIBS} ${LIBNFTNL_LIBS}
+
+if BUILD_XTABLES
+nft_SOURCES += xt.c
+nft_LDADD += ${XTABLES_LIBS}
+endif
diff --git a/src/evaluate.c b/src/evaluate.c
index 1a02ecd..a36a488 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -28,6 +28,7 @@
#include <erec.h>
#include <gmputil.h>
#include <utils.h>
+#include <xt.h>
static int expr_evaluate(struct eval_ctx *ctx, struct expr **expr);
@@ -2294,6 +2295,8 @@ int stmt_evaluate(struct eval_ctx *ctx, struct stmt *stmt)
return stmt_evaluate_fwd(ctx, stmt);
case STMT_SET:
return stmt_evaluate_set(ctx, stmt);
+ case STMT_XT:
+ return stmt_evaluate_xt(ctx, stmt);
default:
BUG("unknown statement type %s\n", stmt->ops->name);
}
diff --git a/src/netlink_delinearize.c b/src/netlink_delinearize.c
index 5a65f16..6475b07 100644
--- a/src/netlink_delinearize.c
+++ b/src/netlink_delinearize.c
@@ -26,6 +26,7 @@
#include <erec.h>
#include <sys/socket.h>
#include <libnftnl/udata.h>
+#include <xt.h>
static int netlink_parse_expr(const struct nftnl_expr *nle,
struct netlink_parse_ctx *ctx);
@@ -986,6 +987,8 @@ static const struct {
{ .name = "queue", .parse = netlink_parse_queue },
{ .name = "dynset", .parse = netlink_parse_dynset },
{ .name = "fwd", .parse = netlink_parse_fwd },
+ { .name = "target", .parse = netlink_parse_target },
+ { .name = "match", .parse = netlink_parse_match },
};
static int netlink_parse_expr(const struct nftnl_expr *nle,
@@ -1798,6 +1801,9 @@ static void rule_parse_postprocess(struct netlink_parse_ctx *ctx, struct rule *r
if (stmt->fwd.to != NULL)
expr_postprocess(&rctx, &stmt->fwd.to);
break;
+ case STMT_XT:
+ stmt_xt_postprocess(&rctx, stmt, rule);
+ break;
default:
break;
}
diff --git a/src/statement.c b/src/statement.c
index 76f528b..7778a95 100644
--- a/src/statement.c
+++ b/src/statement.c
@@ -23,6 +23,7 @@
#include <statement.h>
#include <utils.h>
#include <list.h>
+#include <xt.h>
#include <netinet/in.h>
#include <linux/netfilter/nf_nat.h>
@@ -567,3 +568,27 @@ struct stmt *fwd_stmt_alloc(const struct location *loc)
{
return stmt_alloc(loc, &fwd_stmt_ops);
}
+
+static void xt_stmt_print(const struct stmt *stmt)
+{
+ xt_stmt_xlate(stmt);
+}
+
+static void xt_stmt_destroy(struct stmt *stmt)
+{
+ xfree(stmt->xt.name);
+ xfree(stmt->xt.opts);
+ xt_stmt_release(stmt);
+}
+
+static const struct stmt_ops xt_stmt_ops = {
+ .type = STMT_XT,
+ .name = "xt",
+ .print = xt_stmt_print,
+ .destroy = xt_stmt_destroy,
+};
+
+struct stmt *xt_stmt_alloc(const struct location *loc)
+{
+ return stmt_alloc(loc, &xt_stmt_ops);
+}
diff --git a/src/xt.c b/src/xt.c
new file mode 100644
index 0000000..2088ed5
--- /dev/null
+++ b/src/xt.c
@@ -0,0 +1,575 @@
+/*
+ * Copyright (c) 2013-2015 Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
+ * Copyright (c) 2015 Arturo Borrero Gonzalez <arturo.borrero.glez@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modifyi
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <xtables.h>
+#include <getopt.h>
+#include <ctype.h> /* for isspace */
+#include <statement.h>
+#include <netlink.h>
+#include <xt.h>
+#include <erec.h>
+
+#include <libmnl/libmnl.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nf_tables_compat.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_arp/arp_tables.h>
+#include <linux/netfilter_bridge/ebtables.h>
+
+void xt_stmt_xlate(const struct stmt *stmt)
+{
+ struct xt_xlate *xl = xt_xlate_alloc(10240);
+
+ switch (stmt->xt.type) {
+ case NFT_XT_MATCH:
+ if (stmt->xt.match == NULL && stmt->xt.opts) {
+ printf("%s", stmt->xt.opts);
+ } else if (stmt->xt.match->xlate) {
+ stmt->xt.match->xlate(stmt->xt.entry,
+ stmt->xt.match->m, xl, 0);
+ printf("%s", xt_xlate_get(xl));
+ } else if (stmt->xt.match->print) {
+ printf("#");
+ stmt->xt.match->print(&stmt->xt.entry,
+ stmt->xt.match->m, 0);
+ }
+ break;
+ case NFT_XT_WATCHER:
+ case NFT_XT_TARGET:
+ if (stmt->xt.target == NULL && stmt->xt.opts) {
+ printf("%s", stmt->xt.opts);
+ } else if (stmt->xt.target->xlate) {
+ stmt->xt.target->xlate(stmt->xt.entry,
+ stmt->xt.target->t, xl, 0);
+ printf("%s", xt_xlate_get(xl));
+ } else if (stmt->xt.target->print) {
+ printf("#");
+ stmt->xt.target->print(NULL, stmt->xt.target->t, 0);
+ }
+ break;
+ default:
+ break;
+ }
+
+ xt_xlate_free(xl);
+}
+
+void xt_stmt_release(const struct stmt *stmt)
+{
+ switch (stmt->xt.type) {
+ case NFT_XT_MATCH:
+ if (!stmt->xt.match)
+ break;
+ if (stmt->xt.match->m)
+ xfree(stmt->xt.match->m);
+ xfree(stmt->xt.match);
+ break;
+ case NFT_XT_WATCHER:
+ case NFT_XT_TARGET:
+ if (!stmt->xt.target)
+ break;
+ if (stmt->xt.target->t)
+ xfree(stmt->xt.target->t);
+ xfree(stmt->xt.target);
+ break;
+ default:
+ break;
+ }
+ xfree(stmt->xt.entry);
+}
+
+static void *xt_data_alloc(struct xt_stmt *xt)
+{
+
+ uint32_t size = 0;
+
+ switch (xt->type) {
+ case NFT_XT_MATCH:
+ size = XT_ALIGN(sizeof(struct xt_entry_match)) +
+ xt->match->size;
+ break;
+ case NFT_XT_WATCHER:
+ case NFT_XT_TARGET:
+ size = XT_ALIGN(sizeof(struct xt_entry_target)) +
+ xt->target->size;
+ break;
+ default:
+ break;
+ }
+
+ return xzalloc(size);
+}
+
+static void *xt_entry_alloc(struct xt_stmt *xt, uint32_t af)
+{
+ union nft_entry {
+ struct ipt_entry ipt;
+ struct ip6t_entry ip6t;
+ struct arpt_entry arpt;
+ struct ebt_entry ebt;
+ } *entry;
+
+ entry = xmalloc(sizeof(union nft_entry));
+
+ switch (af) {
+ case NFPROTO_IPV4:
+ entry->ipt.ip.proto = xt->proto;
+ break;
+ case NFPROTO_IPV6:
+ entry->ip6t.ipv6.proto = xt->proto;
+ break;
+ case NFPROTO_BRIDGE:
+ entry->ebt.ethproto = xt->proto;
+ break;
+ case NFPROTO_ARP:
+ entry->arpt.arp.arhln_mask = 0xff;
+ entry->arpt.arp.arhln = 6;
+ break;
+ default:
+ break;
+ }
+
+ return entry;
+}
+
+static uint32_t xt_proto(const struct proto_ctx *pctx)
+{
+ const struct proto_desc *desc = NULL;
+
+ if (pctx->family == NFPROTO_BRIDGE) {
+ desc = pctx->protocol[PROTO_BASE_NETWORK_HDR].desc;
+ if (desc == NULL)
+ return 0;
+ if (strcmp(desc->name, "ip") == 0)
+ return __constant_htons(ETH_P_IP);
+ if (strcmp(desc->name, "ip6") == 0)
+ return __constant_htons(ETH_P_IPV6);
+ return 0;
+ }
+
+ desc = pctx->protocol[PROTO_BASE_TRANSPORT_HDR].desc;
+ if (desc == NULL)
+ return 0;
+ if (strcmp(desc->name, "tcp") == 0)
+ return IPPROTO_TCP;
+ else if (strcmp(desc->name, "udp") == 0)
+ return IPPROTO_UDP;
+ else if (strcmp(desc->name, "udplite") == 0)
+ return IPPROTO_UDPLITE;
+ else if (strcmp(desc->name, "sctp") == 0)
+ return IPPROTO_SCTP;
+ else if (strcmp(desc->name, "dccp") == 0)
+ return IPPROTO_DCCP;
+ else if (strcmp(desc->name, "esp") == 0)
+ return IPPROTO_ESP;
+ else if (strcmp(desc->name, "ah") == 0)
+ return IPPROTO_AH;
+
+ return 0;
+}
+
+static struct xtables_target *xt_target_clone(struct xtables_target *t)
+{
+ struct xtables_target *clone;
+
+ clone = xzalloc(sizeof(struct xtables_target));
+ memcpy(clone, t, sizeof(struct xtables_target));
+ return clone;
+}
+
+static struct xtables_match *xt_match_clone(struct xtables_match *m)
+{
+ struct xtables_match *clone;
+
+ clone = xzalloc(sizeof(struct xtables_match));
+ memcpy(clone, m, sizeof(struct xtables_match));
+ return clone;
+}
+
+/*
+ * Evaluation
+ */
+
+static struct option original_opts[] = {
+ { NULL },
+};
+
+static int xt_target_to_binary(struct xt_stmt *xt, int argc, char *argv[],
+ uint32_t af)
+{
+ struct option *opt;
+ unsigned int offset;
+ int c;
+
+ xt->target->t = xt_data_alloc(xt);
+ xt->entry = xt_entry_alloc(xt, af);
+
+ if (xt->target->x6_options != NULL)
+ opt = xtables_options_xfrm(original_opts, NULL,
+ xt->target->x6_options,
+ &offset);
+ else
+ opt = xtables_merge_options(original_opts, NULL,
+ xt->target->extra_opts,
+ &offset);
+
+ if (xt->target->init != NULL)
+ xt->target->init(xt->target->t);
+
+ /* Reset internal state of getopt_long. */
+ optind = 0;
+ /* Suppress error messages. */
+ opterr = 0;
+
+ while ((c = getopt_long(argc, argv, "-:", opt, NULL)) != -1) {
+
+ c -= offset;
+ xtables_option_tpcall(xt->target->option_offset + c,
+ argv, 0, xt->target, xt->entry);
+ }
+
+ /* Reset parsing flags */
+ xt->target->tflags = 0;
+ xfree(opt);
+
+ return 0;
+}
+
+static int xt_match_to_binary(struct xt_stmt *xt, int argc, char *argv[],
+ uint32_t af)
+{
+ struct option *opt;
+ unsigned int offset;
+ bool invert = false;
+ int c;
+
+ xt->match->m = xt_data_alloc(xt);
+ xt->entry = xt_entry_alloc(xt, af);
+
+ if (xt->match->x6_options != NULL)
+ opt = xtables_options_xfrm(original_opts, NULL,
+ xt->match->x6_options,
+ &offset);
+ else
+ opt = xtables_merge_options(original_opts, NULL,
+ xt->match->extra_opts,
+ &offset);
+
+ if (xt->match->init != NULL)
+ xt->match->init(xt->match->m);
+
+ /* Reset internal state of getopt_long. */
+ optind = 0;
+ /* Suppress error messages. */
+ opterr = 0;
+
+ while ((c = getopt_long(argc, argv, "-:", opt, NULL)) != -1) {
+ switch (c) {
+ case 1:
+ invert = true;
+ continue;
+ default:
+ break;
+ }
+
+ if (optarg != NULL && optarg[0] == '!' && optarg[1] == '\0') {
+ invert = true;
+ optarg = argv[optind];
+ }
+
+ c -= offset;
+ xtables_option_mpcall(xt->match->option_offset + c,
+ argv, invert, xt->match,
+ xt->entry);
+ if (invert)
+ invert = false;
+ }
+
+ /* Reset parsing flags */
+ xt->match->mflags = 0;
+ xfree(opt);
+
+ return 0;
+}
+
+/* An xt extension doesn't have more than arguments. */
+#define MAX_ARG 64
+
+static int string_to_argv(const char *str, char *argv[], uint32_t argc_max)
+{
+ uint32_t i, k = 1, len = 0;
+ bool atquote = false, dupquote = false;
+
+ if (str == NULL)
+ return 0;
+
+ /* skip first/last char, are '[' and ']' */
+ for (i = 1; i < strlen(str) - 1; i++) {
+ if (k == argc_max)
+ goto err;
+
+ if (str[i] == '"') {
+ if (!atquote)
+ dupquote = true;
+ atquote = !atquote;
+ }
+
+ if (isspace(str[i]) && !atquote) {
+ if (len <= 0)
+ continue;
+
+ if (dupquote) {
+ argv[k] = strndup(&str[i - len + 1], len - 2);
+ dupquote = false;
+ } else {
+ argv[k] = strndup(&str[i - len], len);
+ }
+
+ k++;
+ len = 0;
+ } else {
+ len++;
+ }
+ }
+ return k;
+err:
+ for (i = 0; i < k; i++)
+ free(argv[i]);
+ return -1;
+}
+
+int stmt_evaluate_xt(struct eval_ctx *ctx, struct stmt *stmt)
+{
+ char *argv[MAX_ARG] = { "iptables" };
+ struct xtables_match *mt;
+ struct xtables_target *tg;
+ int argc, i, err;
+
+ argc = string_to_argv(stmt->xt.opts, argv, MAX_ARG);
+ if (argc < 0)
+ return stmt_error(ctx, stmt, "too many xt options");
+
+ xtables_set_nfproto(ctx->pctx.family);
+ stmt->xt.proto = xt_proto(&ctx->pctx);
+
+ if (stmt->xt.type == NFT_XT_WATCHER &&
+ ctx->pctx.family != NFPROTO_BRIDGE)
+ return stmt_error(ctx, stmt,
+ "watcher only available in bridge family");
+
+ switch (stmt->xt.type) {
+ case NFT_XT_MATCH:
+ mt = xtables_find_match(stmt->xt.name, XTF_TRY_LOAD, NULL);
+ if (!mt)
+ return stmt_error(ctx, stmt, "unknown match %s",
+ stmt->xt.name);
+
+ stmt->xt.match = xt_match_clone(mt);
+ err = xt_match_to_binary(&stmt->xt, argc, argv,
+ ctx->pctx.family);
+ break;
+ case NFT_XT_TARGET:
+ case NFT_XT_WATCHER:
+ tg = xtables_find_target(stmt->xt.name, XTF_TRY_LOAD);
+ if (!tg)
+ return stmt_error(ctx, stmt, "unknown target %s",
+ stmt->xt.name);
+
+ stmt->xt.target = xt_target_clone(tg);
+ err = xt_target_to_binary(&stmt->xt, argc, argv,
+ ctx->pctx.family);
+ break;
+ default:
+ BUG("Unknown xt type %d\n", stmt->xt.type);
+ }
+
+ if (stmt->xt.type == NFT_XT_TARGET)
+ stmt->flags |= STMT_F_TERMINAL;
+
+ for (i = 1; i < argc; i++)
+ xfree(argv[i]);
+
+ if (err < 0)
+ return stmt_error(ctx, stmt, "failed to parse");
+
+ return 0;
+}
+
+/*
+ * Delinearization
+ */
+
+void netlink_parse_match(struct netlink_parse_ctx *ctx,
+ const struct location *loc,
+ const struct nftnl_expr *nle)
+{
+ struct stmt *stmt;
+ const char *name;
+ struct xtables_match *mt;
+ const char *mtinfo;
+ struct xt_entry_match *m;
+ uint32_t mt_len;
+
+ xtables_set_nfproto(ctx->table->handle.family);
+
+ name = nftnl_expr_get_str(nle, NFT_EXPR_MT_NAME);
+
+ mt = xtables_find_match(name, XTF_TRY_LOAD, NULL);
+ if (!mt)
+ BUG("XT match %s not found\n", name);
+
+ mtinfo = nftnl_expr_get(nle, NFT_EXPR_MT_INFO, &mt_len);
+
+ m = xzalloc(sizeof(struct xt_entry_match) + mt_len);
+ memcpy(&m->data, mtinfo, mt_len);
+
+ m->u.match_size = mt_len + XT_ALIGN(sizeof(struct xt_entry_match));
+ m->u.user.revision = nftnl_expr_get_u32(nle, NFT_EXPR_MT_REV);
+
+ stmt = xt_stmt_alloc(loc);
+ stmt->xt.name = strdup(name);
+ stmt->xt.type = NFT_XT_MATCH;
+ stmt->xt.match = xt_match_clone(mt);
+ stmt->xt.match->m = m;
+
+ list_add_tail(&stmt->list, &ctx->rule->stmts);
+}
+
+void netlink_parse_target(struct netlink_parse_ctx *ctx,
+ const struct location *loc,
+ const struct nftnl_expr *nle)
+{
+ struct stmt *stmt;
+ const char *name;
+ struct xtables_target *tg;
+ const void *tginfo;
+ struct xt_entry_target *t;
+ size_t size;
+ uint32_t tg_len;
+
+ xtables_set_nfproto(ctx->table->handle.family);
+
+ name = nftnl_expr_get_str(nle, NFT_EXPR_TG_NAME);
+ tg = xtables_find_target(name, XTF_TRY_LOAD);
+ if (!tg)
+ BUG("XT target %s not found\n", name);
+
+ tginfo = nftnl_expr_get(nle, NFT_EXPR_TG_INFO, &tg_len);
+
+ size = XT_ALIGN(sizeof(struct xt_entry_target)) + tg_len;
+ t = xzalloc(size);
+ memcpy(&t->data, tginfo, tg_len);
+ t->u.target_size = size;
+ t->u.user.revision = nftnl_expr_get_u32(nle, NFT_EXPR_TG_REV);
+ strcpy(t->u.user.name, tg->name);
+
+ stmt = xt_stmt_alloc(loc);
+ stmt->xt.name = strdup(name);
+ stmt->xt.type = NFT_XT_TARGET;
+ stmt->xt.target = xt_target_clone(tg);
+ stmt->xt.target->t = t;
+
+ list_add_tail(&stmt->list, &ctx->rule->stmts);
+}
+
+static bool is_watcher(uint32_t family, struct stmt *stmt)
+{
+ if (family != NFPROTO_BRIDGE ||
+ stmt->xt.type != NFT_XT_TARGET)
+ return false;
+
+ /* this has to be hardcoded :-( */
+ if (strcmp(stmt->xt.name, "log") == 0)
+ return true;
+ else if (strcmp(stmt->xt.name, "nflog") == 0)
+ return true;
+
+ return false;
+}
+
+void stmt_xt_postprocess(struct rule_pp_ctx *rctx, struct stmt *stmt,
+ struct rule *rule)
+{
+ if (is_watcher(rctx->pctx.family, stmt))
+ stmt->xt.type = NFT_XT_WATCHER;
+
+ stmt->xt.proto = xt_proto(&rctx->pctx);
+ stmt->xt.entry = xt_entry_alloc(&stmt->xt, rctx->pctx.family);
+}
+
+static int nft_xt_compatible_revision(const char *name, uint8_t rev, int opt)
+{
+ struct mnl_socket *nl;
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ struct nlmsghdr *nlh;
+ uint32_t portid, seq, type;
+ struct nfgenmsg *nfg;
+ int ret = 0;
+
+ if (opt == IPT_SO_GET_REVISION_MATCH)
+ type = 0;
+ else
+ type = 1;
+
+ nlh = mnl_nlmsg_put_header(buf);
+ nlh->nlmsg_type = (NFNL_SUBSYS_NFT_COMPAT << 8) | NFNL_MSG_COMPAT_GET;
+ nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ nlh->nlmsg_seq = seq = time(NULL);
+
+ nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg));
+ nfg->nfgen_family = AF_INET;
+ nfg->version = NFNETLINK_V0;
+ nfg->res_id = 0;
+
+ mnl_attr_put_strz(nlh, NFTA_COMPAT_NAME, name);
+ mnl_attr_put_u32(nlh, NFTA_COMPAT_REV, htonl(rev));
+ mnl_attr_put_u32(nlh, NFTA_COMPAT_TYPE, htonl(type));
+
+ nl = mnl_socket_open(NETLINK_NETFILTER);
+ if (nl == NULL)
+ return 0;
+
+ if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0)
+ goto err;
+
+ portid = mnl_socket_get_portid(nl);
+
+ if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0)
+ goto err;
+
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ if (ret == -1)
+ goto err;
+
+ ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL);
+ if (ret == -1)
+ goto err;
+
+err:
+ mnl_socket_close(nl);
+
+ return ret < 0 ? 0 : 1;
+}
+
+static struct xtables_globals xt_nft_globals = {
+ .program_name = "nft",
+ .program_version = PACKAGE_VERSION,
+ .orig_opts = original_opts,
+ .compat_rev = nft_xt_compatible_revision,
+};
+
+static void __init xt_init(void)
+{
+ /* Default to IPv4, but this changes in runtime */
+ xtables_init_all(&xt_nft_globals, NFPROTO_IPV4);
+}
--
2.9.0
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