Initial commitv0.01-alpha1

1 files changed, 781 insertions, 0 deletions

diff --git a/src/netlink_delinearize.c b/src/netlink_delinearize.c
new file mode 100644
index 00000000..be2271ce
--- /dev/null
+++ b/src/netlink_delinearize.c
@@ -0,0 +1,781 @@
+/*
+ * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ */
+
+#include <linux/netfilter/nf_tables.h>
+#include <netlink.h>
+#include <rule.h>
+#include <statement.h>
+#include <expression.h>
+#include <gmputil.h>
+#include <utils.h>
+#include <erec.h>
+
+struct netlink_parse_ctx {
+	struct list_head	*msgs;
+	struct rule		*rule;
+	struct expr		*registers[NFT_REG_MAX + 1];
+};
+
+static void __fmtstring(3, 4) netlink_error(struct netlink_parse_ctx *ctx,
+					    const struct location *loc,
+					    const char *fmt, ...)
+{
+	struct error_record *erec;
+	va_list ap;
+
+	va_start(ap, fmt);
+	erec = erec_vcreate(EREC_ERROR, loc, fmt, ap);
+	va_end(ap);
+	erec_queue(erec, ctx->msgs);
+}
+
+static void netlink_set_register(struct netlink_parse_ctx *ctx,
+				 enum nft_registers reg,
+				 struct expr *expr)
+{
+	if (reg > NFT_REG_MAX) {
+		netlink_error(ctx, &expr->location,
+			      "Invalid destination register %u", reg);
+		expr_free(expr);
+		return;
+	}
+
+	ctx->registers[reg] = expr;
+}
+
+static struct expr *netlink_get_register(struct netlink_parse_ctx *ctx,
+					 const struct location *loc,
+					 enum nft_registers reg)
+{
+	struct expr *expr;
+
+	if (reg == NFT_REG_VERDICT || reg > NFT_REG_MAX) {
+		netlink_error(ctx, loc, "Invalid source register %u", reg);
+		return NULL;
+	}
+
+	expr = ctx->registers[reg];
+	ctx->registers[reg] = NULL;
+	return expr;
+}
+
+static struct expr *netlink_alloc_value(const struct location *loc,
+					const struct nfnl_nft_data *nld)
+{
+	return constant_expr_alloc(loc, &invalid_type, BYTEORDER_INVALID,
+				   nfnl_nft_data_get_size(nld) * BITS_PER_BYTE,
+				   nfnl_nft_data_get(nld));
+}
+
+static struct expr *netlink_alloc_verdict(const struct location *loc,
+					  const struct nfnl_nft_data *nld)
+{
+	unsigned int code;
+	char *chain;
+
+	code = nfnl_nft_verdict_get_verdict(nld);
+	switch (code) {
+	case NFT_JUMP:
+	case NFT_GOTO:
+		chain = xstrdup(nfnl_nft_verdict_get_chain(nld));
+		break;
+	default:
+		chain = NULL;
+		break;
+	}
+
+	return verdict_expr_alloc(loc, code, chain);
+}
+
+static struct expr *netlink_alloc_data(const struct location *loc,
+				       const struct nfnl_nft_data *nld,
+				       enum nft_registers dreg)
+{
+	switch (dreg) {
+	case NFT_REG_VERDICT:
+		return netlink_alloc_verdict(loc, nld);
+	default:
+		return netlink_alloc_value(loc, nld);
+	}
+}
+
+static void netlink_parse_immediate(struct netlink_parse_ctx *ctx,
+				    const struct location *loc,
+				    const struct nfnl_nft_expr *nle)
+{
+	const struct nfnl_nft_data *data = nfnl_nft_immediate_get_data(nle);
+	enum nft_registers dreg = nfnl_nft_immediate_get_dreg(nle);
+	struct stmt *stmt;
+	struct expr *expr;
+
+	expr = netlink_alloc_data(loc, data, dreg);
+	if (dreg == NFT_REG_VERDICT) {
+		stmt = verdict_stmt_alloc(loc, expr);
+		list_add_tail(&stmt->list, &ctx->rule->stmts);
+	} else
+		netlink_set_register(ctx, dreg, expr);
+}
+
+static enum ops netlink_parse_cmp_op(const struct nfnl_nft_expr *nle)
+{
+	switch (nfnl_nft_cmp_get_op(nle)) {
+	case NFT_CMP_EQ:
+		return OP_EQ;
+	case NFT_CMP_NEQ:
+		return OP_NEQ;
+	case NFT_CMP_LT:
+		return OP_LT;
+	case NFT_CMP_LTE:
+		return OP_LTE;
+	case NFT_CMP_GT:
+		return OP_GT;
+	case NFT_CMP_GTE:
+		return OP_GTE;
+	default:
+		return OP_INVALID;
+	}
+}
+
+static void netlink_parse_cmp(struct netlink_parse_ctx *ctx,
+			      const struct location *loc,
+			      const struct nfnl_nft_expr *nle)
+{
+	const struct nfnl_nft_data *data = nfnl_nft_cmp_get_data(nle);
+	struct expr *expr, *left, *right;
+	struct stmt *stmt;
+	enum ops op;
+
+	left = netlink_get_register(ctx, loc, nfnl_nft_cmp_get_sreg(nle));
+	if (left == NULL)
+		return netlink_error(ctx, loc,
+				     "Relational expression has no left "
+				     "hand side");
+
+	op = netlink_parse_cmp_op(nle);
+	right = netlink_alloc_value(loc, data);
+
+	// FIXME
+	if (left->len && left->dtype && left->dtype->type != TYPE_STRING &&
+	    left->len != right->len)
+		return netlink_error(ctx, loc,
+				     "Relational expression size mismatch");
+
+	expr = relational_expr_alloc(loc, op, left, right);
+	stmt = expr_stmt_alloc(loc, expr);
+	list_add_tail(&stmt->list, &ctx->rule->stmts);
+}
+
+struct netlink_data_ctx {
+	const struct location	*location;
+	struct expr		*expr;
+	enum nft_registers	dreg;
+};
+
+static void netlink_data_ctx_init(struct netlink_data_ctx *dctx,
+				  const struct location *loc,
+				  struct expr *expr, enum nft_registers dreg)
+{
+	dctx->location	= loc;
+	dctx->expr	= expr;
+	dctx->dreg	= dreg;
+}
+
+static void netlink_set_parse_data(struct nfnl_nft_data *data,
+				   enum nft_set_elem_flags flags,
+				   void *arg)
+{
+	struct netlink_data_ctx *dctx = arg;
+	struct expr *expr;
+
+	assert(dctx->dreg != NFT_REG_VERDICT);
+	expr = netlink_alloc_value(dctx->location, data);
+	if (flags & NFT_SE_INTERVAL_END)
+		expr->flags |= EXPR_F_INTERVAL_END;
+	compound_expr_add(dctx->expr, expr);
+}
+
+static void netlink_set_parse_mapping(struct nfnl_nft_data *data,
+				      struct nfnl_nft_data *mapping,
+				      enum nft_set_elem_flags flags,
+				      void *arg)
+{
+	struct netlink_data_ctx *dctx = arg;
+	struct expr *expr, *left, *right;
+
+	left  = netlink_alloc_value(dctx->location, data);
+	if (mapping != NULL) {
+		right = netlink_alloc_data(dctx->location, mapping, dctx->dreg);
+		expr  = mapping_expr_alloc(dctx->location, left, right);
+	} else
+		expr  = left;
+
+	if (flags & NFT_SE_INTERVAL_END)
+		expr->flags |= EXPR_F_INTERVAL_END;
+	compound_expr_add(dctx->expr, expr);
+}
+
+extern void interval_map_decompose(struct expr *set);
+
+static void netlink_parse_set(struct netlink_parse_ctx *ctx,
+			      const struct location *loc,
+			      const struct nfnl_nft_expr *nle)
+{
+	struct stmt *stmt;
+	struct expr *expr, *left, *right;
+	struct netlink_data_ctx dctx;
+	enum nft_registers dreg;
+	enum nft_set_flags flags;
+
+	left = netlink_get_register(ctx, loc, nfnl_nft_set_get_sreg(nle));
+	if (left == NULL)
+		return netlink_error(ctx, loc,
+				     "Set expression has no left hand side");
+
+	right = set_expr_alloc(loc);
+
+	flags = nfnl_nft_set_get_flags(nle);
+	if (flags & NFT_SET_MAP) {
+		dreg = nfnl_nft_set_get_dreg(nle);
+		netlink_data_ctx_init(&dctx, loc, right, dreg);
+		nfnl_nft_set_foreach_mapping(nle, netlink_set_parse_mapping,
+					     &dctx);
+
+		expr = map_expr_alloc(loc, left, right);
+		if (dreg != NFT_REG_VERDICT)
+			return netlink_set_register(ctx, dreg, expr);
+	} else {
+		netlink_data_ctx_init(&dctx, loc, right, EXPR_VALUE);
+		nfnl_nft_set_foreach_elem(nle, netlink_set_parse_data, &dctx);
+		if (flags & NFT_SET_INTERVAL) {
+			interval_map_decompose(right);
+			right->flags |= NFT_SET_INTERVAL;
+		}
+		expr = relational_expr_alloc(loc, OP_LOOKUP, left, right);
+	}
+
+	stmt = expr_stmt_alloc(loc, expr);
+	list_add_tail(&stmt->list, &ctx->rule->stmts);
+}
+
+static void netlink_parse_bitwise(struct netlink_parse_ctx *ctx,
+				  const struct location *loc,
+				  const struct nfnl_nft_expr *nle)
+{
+	struct expr *expr, *left, *mask, *xor, *or;
+	mpz_t m, x, o;
+
+	left = netlink_get_register(ctx, loc, nfnl_nft_bitwise_get_sreg(nle));
+	if (left == NULL)
+		return netlink_error(ctx, loc,
+				     "Bitwise expression has no left "
+				     "hand side");
+
+	expr = left;
+
+	mask = netlink_alloc_value(loc, nfnl_nft_bitwise_get_mask(nle));
+	mpz_init_set(m, mask->value);
+
+	xor  = netlink_alloc_value(loc, nfnl_nft_bitwise_get_xor(nle));
+	mpz_init_set(x, xor->value);
+
+	mpz_init_set_ui(o, 0);
+	if (mpz_scan0(m, 0) != mask->len || mpz_cmp_ui(x, 0)) {
+		/* o = (m & x) ^ x */
+		mpz_and(o, m, x);
+		mpz_xor(o, o, x);
+		/* x &= m */
+		mpz_and(x, x, m);
+		/* m |= o */
+		mpz_ior(m, m, o);
+	}
+
+	if (mpz_scan0(m, 0) != left->len) {
+		mpz_set(mask->value, m);
+		expr = binop_expr_alloc(loc, OP_AND, expr, mask);
+		expr->len = left->len;
+	} else
+		expr_free(mask);
+
+	if (mpz_cmp_ui(x, 0)) {
+		mpz_set(xor->value, x);
+		expr = binop_expr_alloc(loc, OP_XOR, expr, xor);
+		expr->len = left->len;
+	} else
+		expr_free(xor);
+
+	if (mpz_cmp_ui(o, 0)) {
+		or = netlink_alloc_value(loc, nfnl_nft_bitwise_get_xor(nle));
+		mpz_set(or->value, o);
+		expr = binop_expr_alloc(loc, OP_OR, expr, or);
+		expr->len = left->len;
+	}
+
+	mpz_clear(m);
+	mpz_clear(x);
+	mpz_clear(o);
+
+	netlink_set_register(ctx, nfnl_nft_bitwise_get_dreg(nle), expr);
+}
+
+static void netlink_parse_byteorder(struct netlink_parse_ctx *ctx,
+				    const struct location *loc,
+				    const struct nfnl_nft_expr *nle)
+{
+	struct expr *expr, *arg;
+	enum ops op;
+
+	arg = netlink_get_register(ctx, loc, nfnl_nft_byteorder_get_sreg(nle));
+	if (arg == NULL)
+		return netlink_error(ctx, loc,
+				     "Byteorder expression has no left "
+				     "hand side");
+
+	switch (nfnl_nft_byteorder_get_op(nle)) {
+	case NFT_BYTEORDER_NTOH:
+		op = OP_NTOH;
+		break;
+	case NFT_BYTEORDER_HTON:
+		op = OP_HTON;
+		break;
+	default:
+		BUG();
+	}
+
+	expr = unary_expr_alloc(loc, op, arg);
+	expr->len = arg->len;
+	netlink_set_register(ctx, nfnl_nft_byteorder_get_dreg(nle), expr);
+}
+
+static void netlink_parse_payload(struct netlink_parse_ctx *ctx,
+				  const struct location *loc,
+				  const struct nfnl_nft_expr *nle)
+{
+	struct expr *expr;
+
+	expr = payload_expr_alloc(loc, NULL, 0);
+	payload_init_raw(expr, nfnl_nft_payload_get_base(nle) + 1,
+			 nfnl_nft_payload_get_offset(nle) * BITS_PER_BYTE,
+			 nfnl_nft_payload_get_len(nle) * BITS_PER_BYTE);
+
+	netlink_set_register(ctx, nfnl_nft_payload_get_dreg(nle), expr);
+}
+
+static void netlink_parse_exthdr(struct netlink_parse_ctx *ctx,
+				 const struct location *loc,
+				 const struct nfnl_nft_expr *nle)
+{
+	struct expr *expr;
+
+	expr = exthdr_expr_alloc(loc, NULL, 0);
+	exthdr_init_raw(expr, nfnl_nft_exthdr_get_type(nle),
+			nfnl_nft_exthdr_get_offset(nle) * BITS_PER_BYTE,
+			nfnl_nft_exthdr_get_len(nle) * BITS_PER_BYTE);
+
+	netlink_set_register(ctx, nfnl_nft_exthdr_get_dreg(nle), expr);
+}
+
+static void netlink_parse_meta(struct netlink_parse_ctx *ctx,
+			       const struct location *loc,
+			       const struct nfnl_nft_expr *nle)
+{
+	struct expr *expr;
+
+	expr = meta_expr_alloc(loc, nfnl_nft_meta_get_key(nle));
+	netlink_set_register(ctx, nfnl_nft_meta_get_dreg(nle), expr);
+}
+
+static void netlink_parse_ct(struct netlink_parse_ctx *ctx,
+			     const struct location *loc,
+			     const struct nfnl_nft_expr *nle)
+{
+	struct expr *expr;
+
+	expr = ct_expr_alloc(loc, nfnl_nft_ct_get_key(nle));
+	netlink_set_register(ctx, nfnl_nft_ct_get_dreg(nle), expr);
+}
+
+static void netlink_parse_counter(struct netlink_parse_ctx *ctx,
+				  const struct location *loc,
+				  const struct nfnl_nft_expr *nle)
+{
+	struct stmt *stmt;
+
+	stmt = counter_stmt_alloc(loc);
+	stmt->counter.packets = nfnl_nft_counter_get_packets(nle);
+	stmt->counter.bytes   = nfnl_nft_counter_get_bytes(nle);
+	list_add_tail(&stmt->list, &ctx->rule->stmts);
+}
+
+static void netlink_parse_log(struct netlink_parse_ctx *ctx,
+			      const struct location *loc,
+			      const struct nfnl_nft_expr *nle)
+{
+	struct stmt *stmt;
+	const char *prefix;
+
+	stmt = log_stmt_alloc(loc);
+	prefix = nfnl_nft_log_get_prefix(nle);
+	if (prefix != NULL)
+		stmt->log.prefix = xstrdup(prefix);
+	stmt->log.group	     = nfnl_nft_log_get_group(nle);
+	stmt->log.snaplen    = nfnl_nft_log_get_snaplen(nle);
+	stmt->log.qthreshold = nfnl_nft_log_get_qthreshold(nle);
+	list_add_tail(&stmt->list, &ctx->rule->stmts);
+}
+
+static void netlink_parse_limit(struct netlink_parse_ctx *ctx,
+				const struct location *loc,
+				const struct nfnl_nft_expr *nle)
+{
+	struct stmt *stmt;
+
+	stmt = limit_stmt_alloc(loc);
+	stmt->limit.rate  = nfnl_nft_limit_get_rate(nle);
+	stmt->limit.depth = nfnl_nft_limit_get_depth(nle);
+	list_add_tail(&stmt->list, &ctx->rule->stmts);
+}
+
+static void netlink_parse_reject(struct netlink_parse_ctx *ctx,
+				 const struct location *loc,
+				 const struct nfnl_nft_expr *expr)
+{
+	struct stmt *stmt;
+
+	stmt = reject_stmt_alloc(loc);
+	list_add_tail(&stmt->list, &ctx->rule->stmts);
+}
+
+static void netlink_parse_nat(struct netlink_parse_ctx *ctx,
+			      const struct location *loc,
+			      const struct nfnl_nft_expr *nle)
+{
+	struct stmt *stmt;
+	struct expr *addr, *proto;
+	enum nft_registers reg1, reg2;
+
+	stmt = nat_stmt_alloc(loc);
+	stmt->nat.type = nfnl_nft_nat_get_type(nle);
+
+	reg1 = nfnl_nft_nat_get_sreg_addr_min(nle);
+	if (reg1) {
+		addr = netlink_get_register(ctx, loc, reg1);
+		if (addr == NULL)
+			return netlink_error(ctx, loc,
+					     "NAT statement has no address "
+					     "expression");
+
+		expr_set_type(addr, &ipaddr_type, BYTEORDER_BIG_ENDIAN);
+		stmt->nat.addr = addr;
+	}
+
+	reg2 = nfnl_nft_nat_get_sreg_addr_max(nle);
+	if (reg2 && reg2 != reg1) {
+		addr = netlink_get_register(ctx, loc, reg2);
+		if (addr == NULL)
+			return netlink_error(ctx, loc,
+					     "NAT statement has no address "
+					     "expression");
+
+		expr_set_type(addr, &ipaddr_type, BYTEORDER_BIG_ENDIAN);
+		if (stmt->nat.addr != NULL)
+			addr = range_expr_alloc(loc, stmt->nat.addr, addr);
+		stmt->nat.addr = addr;
+	}
+
+	reg1 = nfnl_nft_nat_get_sreg_proto_min(nle);
+	if (reg1) {
+		proto = netlink_get_register(ctx, loc, reg1);
+		if (proto == NULL)
+			return netlink_error(ctx, loc,
+					     "NAT statement has no proto "
+					     "expression");
+
+		expr_set_type(proto, &inet_service_type, BYTEORDER_BIG_ENDIAN);
+		stmt->nat.proto = proto;
+	}
+
+	reg2 = nfnl_nft_nat_get_sreg_proto_max(nle);
+	if (reg2 && reg2 != reg1) {
+		proto = netlink_get_register(ctx, loc, reg1);
+		if (proto == NULL)
+			return netlink_error(ctx, loc,
+					     "NAT statement has no proto "
+					     "expression");
+
+		expr_set_type(proto, &inet_service_type, BYTEORDER_BIG_ENDIAN);
+		stmt->nat.proto = proto;
+		if (stmt->nat.proto != NULL)
+			proto = range_expr_alloc(loc, stmt->nat.proto, proto);
+		stmt->nat.proto = proto;
+	}
+
+	list_add_tail(&stmt->list, &ctx->rule->stmts);
+}
+
+static const struct {
+	const char	*name;
+	void		(*parse)(struct netlink_parse_ctx *ctx,
+				 const struct location *loc,
+				 const struct nfnl_nft_expr *nle);
+} netlink_parsers[] = {
+	{ .name = "immediate",	.parse = netlink_parse_immediate },
+	{ .name = "cmp",	.parse = netlink_parse_cmp },
+	{ .name = "set",	.parse = netlink_parse_set },
+	{ .name = "bitwise",	.parse = netlink_parse_bitwise },
+	{ .name = "byteorder",	.parse = netlink_parse_byteorder },
+	{ .name = "payload",	.parse = netlink_parse_payload },
+	{ .name = "exthdr",	.parse = netlink_parse_exthdr },
+	{ .name = "meta",	.parse = netlink_parse_meta },
+	{ .name = "ct",		.parse = netlink_parse_ct },
+	{ .name = "counter",	.parse = netlink_parse_counter },
+	{ .name = "log",	.parse = netlink_parse_log },
+	{ .name = "limit",	.parse = netlink_parse_limit },
+	{ .name = "reject",	.parse = netlink_parse_reject },
+	{ .name = "nat",	.parse = netlink_parse_nat },
+};
+
+static const struct input_descriptor indesc_netlink = {
+	.name = "netlink",
+	.type  = INDESC_NETLINK,
+};
+
+static void netlink_parse_expr(struct nl_object *obj, void *arg)
+{
+	const struct nfnl_nft_expr *nle = (struct nfnl_nft_expr *)obj;
+	const char *type = nfnl_nft_expr_get_type(nle);
+	struct netlink_parse_ctx *ctx = arg;
+	struct location loc;
+	unsigned int i;
+
+	memset(&loc, 0, sizeof(loc));
+	loc.indesc = &indesc_netlink;
+	loc.nl_obj = obj;
+
+	for (i = 0; i < array_size(netlink_parsers); i++) {
+		if (strcmp(type, netlink_parsers[i].name))
+			continue;
+		return netlink_parsers[i].parse(ctx, &loc, nle);
+	}
+
+	netlink_error(ctx, &loc, "unknown expression type '%s'", type);
+}
+
+struct rule_pp_ctx {
+	struct payload_ctx	pctx;
+};
+
+static void payload_match_postprocess(struct payload_ctx *ctx,
+				      struct stmt *stmt, struct expr *expr)
+{
+	struct expr *left = expr->left, *right = expr->right, *tmp;
+	struct list_head list = LIST_HEAD_INIT(list);
+	struct stmt *nstmt;
+	struct expr *nexpr;
+
+	switch (expr->op) {
+	case OP_EQ:
+	case OP_NEQ:
+		payload_expr_expand(&list, left, ctx);
+		list_for_each_entry(left, &list, list) {
+			tmp = constant_expr_splice(right, left->len);
+			expr_set_type(tmp, left->dtype, left->byteorder);
+			nexpr = relational_expr_alloc(&expr->location, expr->op,
+						      left, tmp);
+			payload_ctx_update(ctx, nexpr);
+
+			nstmt = expr_stmt_alloc(&stmt->location, nexpr);
+			list_add_tail(&nstmt->list, &stmt->list);
+		}
+		list_del(&stmt->list);
+		stmt_free(stmt);
+		break;
+	default:
+		payload_expr_complete(left, ctx);
+		expr_set_type(expr->right, expr->left->dtype,
+			      expr->left->byteorder);
+		break;
+	}
+}
+
+static void meta_match_postprocess(struct payload_ctx *ctx,
+				   const struct expr *expr)
+{
+	switch (expr->op) {
+	case OP_EQ:
+		payload_ctx_update_meta(ctx, expr);
+		break;
+	default:
+		break;
+	}
+}
+
+static void expr_postprocess(struct rule_pp_ctx *ctx,
+			     struct stmt *stmt, struct expr **exprp)
+{
+	struct expr *expr = *exprp, *i;
+
+	//pr_debug("%s len %u\n", expr->ops->name, expr->len);
+
+	switch (expr->ops->type) {
+	case EXPR_MAP:
+		expr_postprocess(ctx, stmt, &expr->expr);
+		list_for_each_entry(i, &expr->mappings->expressions, list) {
+			if (i->flags & EXPR_F_INTERVAL_END)
+				continue;
+			expr_set_type(i->left, expr->expr->dtype,
+				      expr->expr->byteorder);
+		}
+		expr_postprocess(ctx, stmt, &expr->mappings);
+		break;
+	case EXPR_MAPPING:
+		expr_postprocess(ctx, stmt, &expr->left);
+		expr_postprocess(ctx, stmt, &expr->right);
+		break;
+	case EXPR_SET:
+		list_for_each_entry(i, &expr->expressions, list)
+			expr_postprocess(ctx, stmt, &i);
+		break;
+	case EXPR_UNARY:
+		expr_postprocess(ctx, stmt, &expr->arg);
+		expr_set_type(expr->arg, expr->arg->dtype, !expr->arg->byteorder);
+
+		*exprp = expr_get(expr->arg);
+		expr_free(expr);
+		break;
+	case EXPR_BINOP:
+		expr_postprocess(ctx, stmt, &expr->left);
+		expr_postprocess(ctx, stmt, &expr->right);
+		expr_set_type(expr->right, expr->left->dtype,
+			      expr->left->byteorder);
+		expr_set_type(expr, expr->left->dtype,
+			      expr->left->byteorder);
+		break;
+	case EXPR_RELATIONAL:
+		switch (expr->left->ops->type) {
+		case EXPR_PAYLOAD:
+			payload_match_postprocess(&ctx->pctx, stmt, expr);
+			return;
+		case EXPR_META:
+			meta_match_postprocess(&ctx->pctx, expr);
+			break;
+		default:
+			expr_postprocess(ctx, stmt, &expr->left);
+			break;
+		}
+
+		expr_set_type(expr->right, expr->left->dtype, expr->left->byteorder);
+		expr_postprocess(ctx, stmt, &expr->right);
+
+		if (expr->left->ops->type == EXPR_BINOP &&
+		    expr->left->op == OP_AND &&
+		    expr->op == OP_NEQ &&
+		    expr->right->dtype->basetype->type == TYPE_BITMASK) {
+			unsigned int n;
+
+			expr_free(expr->right);
+			expr->right = list_expr_alloc(&expr->left->left->location);
+			n = 0;
+			while ((n = mpz_scan1(expr->left->right->value, n + 1))) {
+				if (n > expr->left->right->len)
+					break;
+				i = constant_expr_alloc(&expr->left->right->location,
+							expr->left->left->dtype,
+							expr->left->right->byteorder,
+							expr->left->right->len, NULL);
+				mpz_set_ui(i->value, 1);
+				mpz_lshift_ui(i->value, n);
+				compound_expr_add(expr->right, i);
+			}
+			expr->left = expr->left->left;
+			expr->op = OP_FLAGCMP;
+		}
+		break;
+	case EXPR_PAYLOAD:
+		payload_expr_complete(expr, &ctx->pctx);
+		break;
+	case EXPR_VALUE:
+		// FIXME
+		if (expr->byteorder == BYTEORDER_HOST_ENDIAN)
+			mpz_switch_byteorder(expr->value, expr->len / BITS_PER_BYTE);
+
+		// Quite a hack :)
+		if (expr->dtype->type == TYPE_STRING) {
+			unsigned int len = expr->len;
+			mpz_t tmp;
+			mpz_init(tmp);
+			while (len >= BITS_PER_BYTE) {
+				mpz_bitmask(tmp, BITS_PER_BYTE);
+				mpz_lshift_ui(tmp, len - BITS_PER_BYTE);
+				mpz_and(tmp, tmp, expr->value);
+				if (mpz_cmp_ui(tmp, 0))
+					break;
+				len -= BITS_PER_BYTE;
+			}
+			mpz_clear(tmp);
+			expr->len = len;
+		}
+		break;
+	case EXPR_EXTHDR:
+	case EXPR_META:
+	case EXPR_CT:
+	case EXPR_VERDICT:
+		break;
+	default:
+		printf("%s\n", expr->ops->name);
+		BUG();
+	}
+}
+
+static void rule_parse_postprocess(struct netlink_parse_ctx *ctx, struct rule *rule)
+{
+	struct rule_pp_ctx rctx;
+	struct stmt *stmt, *next;
+
+	payload_ctx_init(&rctx.pctx, rule->handle.family);
+
+	list_for_each_entry_safe(stmt, next, &rule->stmts, list) {
+		switch (stmt->ops->type) {
+		case STMT_EXPRESSION:
+			expr_postprocess(&rctx, stmt, &stmt->expr);
+			break;
+		case STMT_NAT:
+			if (stmt->nat.addr != NULL)
+				expr_postprocess(&rctx, stmt, &stmt->nat.addr);
+			if (stmt->nat.proto != NULL)
+				expr_postprocess(&rctx, stmt, &stmt->nat.proto);
+			break;
+		default:
+			break;
+		}
+	}
+}
+
+struct rule *netlink_delinearize_rule(struct netlink_ctx *ctx,
+				      const struct nl_object *obj)
+{
+	const struct nfnl_nft_rule *nlr = (const struct nfnl_nft_rule *)obj;
+	struct netlink_parse_ctx _ctx, *pctx = &_ctx;
+	struct handle h;
+
+	memset(&_ctx, 0, sizeof(_ctx));
+	_ctx.msgs = ctx->msgs;
+
+	memset(&h, 0, sizeof(h));
+	h.family = nfnl_nft_rule_get_family(nlr);
+	h.table  = xstrdup(nfnl_nft_rule_get_table(nlr));
+	h.chain  = xstrdup(nfnl_nft_rule_get_chain(nlr));
+	h.handle = nfnl_nft_rule_get_handle(nlr);
+
+	pctx->rule = rule_alloc(&internal_location, &h);
+	nfnl_nft_rule_foreach_expr(nlr, netlink_parse_expr, pctx);
+
+	rule_parse_postprocess(pctx, pctx->rule);
+	return pctx->rule;
+}