Adding upstream version 1.2.6.upstream/1.2.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 271 insertions, 0 deletions

diff --git a/src/expr/exthdr.c b/src/expr/exthdr.c
new file mode 100644
index 0000000..739c7ff
--- /dev/null
+++ b/src/expr/exthdr.c
@@ -0,0 +1,271 @@
+/*
+ * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * 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.
+ *
+ * This code has been sponsored by Sophos Astaro <http://www.sophos.com>
+ */
+
+#include "internal.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <limits.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <libmnl/libmnl.h>
+
+#include <linux/netfilter/nf_tables.h>
+
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+
+#ifndef IPPROTO_MH
+#define IPPROTO_MH 135
+#endif
+
+struct nftnl_expr_exthdr {
+	enum nft_registers	dreg;
+	enum nft_registers	sreg;
+	uint32_t		offset;
+	uint32_t		len;
+	uint8_t			type;
+	uint32_t		op;
+	uint32_t		flags;
+};
+
+static int
+nftnl_expr_exthdr_set(struct nftnl_expr *e, uint16_t type,
+			  const void *data, uint32_t data_len)
+{
+	struct nftnl_expr_exthdr *exthdr = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_EXTHDR_DREG:
+		memcpy(&exthdr->dreg, data, sizeof(exthdr->dreg));
+		break;
+	case NFTNL_EXPR_EXTHDR_TYPE:
+		memcpy(&exthdr->type, data, sizeof(exthdr->type));
+		break;
+	case NFTNL_EXPR_EXTHDR_OFFSET:
+		memcpy(&exthdr->offset, data, sizeof(exthdr->offset));
+		break;
+	case NFTNL_EXPR_EXTHDR_LEN:
+		memcpy(&exthdr->len, data, sizeof(exthdr->len));
+		break;
+	case NFTNL_EXPR_EXTHDR_OP:
+		memcpy(&exthdr->op, data, sizeof(exthdr->op));
+		break;
+	case NFTNL_EXPR_EXTHDR_FLAGS:
+		memcpy(&exthdr->flags, data, sizeof(exthdr->flags));
+		break;
+	case NFTNL_EXPR_EXTHDR_SREG:
+		memcpy(&exthdr->sreg, data, sizeof(exthdr->sreg));
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+static const void *
+nftnl_expr_exthdr_get(const struct nftnl_expr *e, uint16_t type,
+			 uint32_t *data_len)
+{
+	struct nftnl_expr_exthdr *exthdr = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_EXTHDR_DREG:
+		*data_len = sizeof(exthdr->dreg);
+		return &exthdr->dreg;
+	case NFTNL_EXPR_EXTHDR_TYPE:
+		*data_len = sizeof(exthdr->type);
+		return &exthdr->type;
+	case NFTNL_EXPR_EXTHDR_OFFSET:
+		*data_len = sizeof(exthdr->offset);
+		return &exthdr->offset;
+	case NFTNL_EXPR_EXTHDR_LEN:
+		*data_len = sizeof(exthdr->len);
+		return &exthdr->len;
+	case NFTNL_EXPR_EXTHDR_OP:
+		*data_len = sizeof(exthdr->op);
+		return &exthdr->op;
+	case NFTNL_EXPR_EXTHDR_FLAGS:
+		*data_len = sizeof(exthdr->flags);
+		return &exthdr->flags;
+	case NFTNL_EXPR_EXTHDR_SREG:
+		*data_len = sizeof(exthdr->sreg);
+		return &exthdr->sreg;
+	}
+	return NULL;
+}
+
+static int nftnl_expr_exthdr_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, NFTA_EXTHDR_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTA_EXTHDR_TYPE:
+		if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
+			abi_breakage();
+		break;
+	case NFTA_EXTHDR_DREG:
+	case NFTA_EXTHDR_SREG:
+	case NFTA_EXTHDR_OFFSET:
+	case NFTA_EXTHDR_LEN:
+	case NFTA_EXTHDR_OP:
+	case NFTA_EXTHDR_FLAGS:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_exthdr_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_exthdr *exthdr = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_EXTHDR_DREG))
+		mnl_attr_put_u32(nlh, NFTA_EXTHDR_DREG, htonl(exthdr->dreg));
+	if (e->flags & (1 << NFTNL_EXPR_EXTHDR_SREG))
+		mnl_attr_put_u32(nlh, NFTA_EXTHDR_SREG, htonl(exthdr->sreg));
+	if (e->flags & (1 << NFTNL_EXPR_EXTHDR_TYPE))
+		mnl_attr_put_u8(nlh, NFTA_EXTHDR_TYPE, exthdr->type);
+	if (e->flags & (1 << NFTNL_EXPR_EXTHDR_OFFSET))
+		mnl_attr_put_u32(nlh, NFTA_EXTHDR_OFFSET, htonl(exthdr->offset));
+	if (e->flags & (1 << NFTNL_EXPR_EXTHDR_LEN))
+		mnl_attr_put_u32(nlh, NFTA_EXTHDR_LEN, htonl(exthdr->len));
+	if (e->flags & (1 << NFTNL_EXPR_EXTHDR_OP))
+		mnl_attr_put_u32(nlh, NFTA_EXTHDR_OP, htonl(exthdr->op));
+	if (e->flags & (1 << NFTNL_EXPR_EXTHDR_FLAGS))
+		mnl_attr_put_u32(nlh, NFTA_EXTHDR_FLAGS, htonl(exthdr->flags));
+}
+
+static int
+nftnl_expr_exthdr_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+	struct nftnl_expr_exthdr *exthdr = nftnl_expr_data(e);
+	struct nlattr *tb[NFTA_EXTHDR_MAX+1] = {};
+
+	if (mnl_attr_parse_nested(attr, nftnl_expr_exthdr_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_EXTHDR_DREG]) {
+		exthdr->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_DREG]));
+		e->flags |= (1 << NFTNL_EXPR_EXTHDR_DREG);
+	}
+	if (tb[NFTA_EXTHDR_SREG]) {
+		exthdr->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_SREG]));
+		e->flags |= (1 << NFTNL_EXPR_EXTHDR_SREG);
+	}
+	if (tb[NFTA_EXTHDR_TYPE]) {
+		exthdr->type = mnl_attr_get_u8(tb[NFTA_EXTHDR_TYPE]);
+		e->flags |= (1 << NFTNL_EXPR_EXTHDR_TYPE);
+	}
+	if (tb[NFTA_EXTHDR_OFFSET]) {
+		exthdr->offset = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_OFFSET]));
+		e->flags |= (1 << NFTNL_EXPR_EXTHDR_OFFSET);
+	}
+	if (tb[NFTA_EXTHDR_LEN]) {
+		exthdr->len = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_LEN]));
+		e->flags |= (1 << NFTNL_EXPR_EXTHDR_LEN);
+	}
+	if (tb[NFTA_EXTHDR_OP]) {
+		exthdr->op = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_OP]));
+		e->flags |= (1 << NFTNL_EXPR_EXTHDR_OP);
+	}
+	if (tb[NFTA_EXTHDR_FLAGS]) {
+		exthdr->flags = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_FLAGS]));
+		e->flags |= (1 << NFTNL_EXPR_EXTHDR_FLAGS);
+	}
+
+	return 0;
+}
+
+static const char *op2str(uint8_t op)
+{
+	switch (op) {
+	case NFT_EXTHDR_OP_TCPOPT:
+		return " tcpopt";
+	case NFT_EXTHDR_OP_IPV6:
+		return " ipv6";
+	case NFT_EXTHDR_OP_IPV4:
+		return " ipv4";
+	default:
+		return "";
+	}
+}
+
+static inline int str2exthdr_op(const char* str)
+{
+	if (!strcmp(str, "tcpopt"))
+		return NFT_EXTHDR_OP_TCPOPT;
+	if (!strcmp(str, "ipv4"))
+		return NFT_EXTHDR_OP_IPV4;
+
+	/* if str == "ipv6" or anything else */
+	return NFT_EXTHDR_OP_IPV6;
+}
+
+static inline int str2exthdr_type(const char *str)
+{
+	if (strcmp(str, "hopopts") == 0)
+		return IPPROTO_HOPOPTS;
+	else if (strcmp(str, "routing") == 0)
+		return IPPROTO_ROUTING;
+	else if (strcmp(str, "fragment") == 0)
+		return IPPROTO_FRAGMENT;
+	else if (strcmp(str, "dstopts") == 0)
+		return IPPROTO_DSTOPTS;
+	else if (strcmp(str, "mh") == 0)
+		return IPPROTO_MH;
+
+	return -1;
+}
+
+static int
+nftnl_expr_exthdr_snprintf(char *buf, size_t len,
+			   uint32_t flags, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_exthdr *exthdr = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_EXTHDR_DREG))
+		return snprintf(buf, len, "load%s %ub @ %u + %u%s => reg %u ",
+				op2str(exthdr->op), exthdr->len, exthdr->type,
+				exthdr->offset,
+				exthdr->flags & NFT_EXTHDR_F_PRESENT ? " present" : "",
+				exthdr->dreg);
+	else if (e->flags & (1 << NFTNL_EXPR_EXTHDR_SREG))
+		return snprintf(buf, len, "write%s reg %u => %ub @ %u + %u ",
+				op2str(exthdr->op), exthdr->sreg, exthdr->len, exthdr->type,
+				exthdr->offset);
+	else if (exthdr->op == NFT_EXTHDR_OP_TCPOPT && exthdr->len == 0)
+		return snprintf(buf, len, "reset tcpopt %u ", exthdr->type);
+	else
+		return snprintf(buf, len, "op %u len %u type %u offset %u ",
+				exthdr->op, exthdr->len, exthdr->type, exthdr->offset);
+
+}
+
+struct expr_ops expr_ops_exthdr = {
+	.name		= "exthdr",
+	.alloc_len	= sizeof(struct nftnl_expr_exthdr),
+	.max_attr	= NFTA_EXTHDR_MAX,
+	.set		= nftnl_expr_exthdr_set,
+	.get		= nftnl_expr_exthdr_get,
+	.parse		= nftnl_expr_exthdr_parse,
+	.build		= nftnl_expr_exthdr_build,
+	.output		= nftnl_expr_exthdr_snprintf,
+};