--- /dev/null
+/*
+ * (C) 2012 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 <stdint.h>
+#include <string.h> /* for memcpy */
+#include <arpa/inet.h>
+#include <libmnl/libmnl.h>
+#include <linux/netfilter/nf_tables.h>
+#include <libnftables/expr.h>
+#include "data_reg.h"
+#include "expr_ops.h"
+
+struct nft_expr_bitwise {
+ enum nft_registers sreg;
+ enum nft_registers dreg;
+ unsigned int len;
+ union nft_data_reg mask;
+ union nft_data_reg xor;
+};
+
+static int
+nft_rule_expr_bitwise_set(struct nft_rule_expr *e, uint16_t type,
+ const void *data, size_t data_len)
+{
+ struct nft_expr_bitwise *bitwise = (struct nft_expr_bitwise *)e->data;
+
+ switch(type) {
+ case NFT_EXPR_BITWISE_SREG:
+ bitwise->sreg = *((uint32_t *)data);
+ break;
+ case NFT_EXPR_BITWISE_DREG:
+ bitwise->dreg = *((uint32_t *)data);
+ break;
+ case NFT_EXPR_BITWISE_LEN:
+ bitwise->len = *((unsigned int *)data);
+ break;
+ case NFT_EXPR_BITWISE_MASK:
+ memcpy(&bitwise->mask.val, data, data_len);
+ bitwise->mask.len = data_len;
+ break;
+ case NFT_EXPR_BITWISE_XOR:
+ memcpy(&bitwise->xor.val, data, data_len);
+ bitwise->xor.len = data_len;
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *
+nft_rule_expr_bitwise_get(struct nft_rule_expr *e, uint16_t type, size_t *data_len)
+{
+ struct nft_expr_bitwise *bitwise = (struct nft_expr_bitwise *)e->data;
+
+ switch(type) {
+ case NFT_EXPR_BITWISE_SREG:
+ if (e->flags & (1 << NFT_EXPR_BITWISE_SREG)) {
+ *data_len = sizeof(bitwise->sreg);
+ return &bitwise->sreg;
+ }
+ break;
+ case NFT_EXPR_BITWISE_DREG:
+ if (e->flags & (1 << NFT_EXPR_BITWISE_DREG)) {
+ *data_len = sizeof(bitwise->dreg);
+ return &bitwise->dreg;
+ }
+ break;
+ case NFT_EXPR_BITWISE_LEN:
+ if (e->flags & (1 << NFT_EXPR_BITWISE_LEN)) {
+ *data_len = sizeof(bitwise->len);
+ return &bitwise->len;
+ }
+ break;
+ case NFT_EXPR_BITWISE_MASK:
+ if (e->flags & (1 << NFT_EXPR_BITWISE_MASK)) {
+ *data_len = bitwise->mask.len;
+ return &bitwise->mask.val;
+ }
+ break;
+ case NFT_EXPR_BITWISE_XOR:
+ if (e->flags & (1 << NFT_EXPR_BITWISE_XOR)) {
+ *data_len = bitwise->xor.len;
+ return &bitwise->xor.val;
+ }
+ break;
+ default:
+ break;
+ }
+ return NULL;
+}
+
+static int nft_rule_expr_bitwise_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_BITWISE_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch(type) {
+ case NFTA_BITWISE_SREG:
+ case NFTA_BITWISE_DREG:
+ case NFTA_BITWISE_LEN:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
+ perror("mnl_attr_validate");
+ return MNL_CB_ERROR;
+ }
+ break;
+ case NFTA_BITWISE_MASK:
+ case NFTA_BITWISE_XOR:
+ if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0) {
+ perror("mnl_attr_validate");
+ return MNL_CB_ERROR;
+ }
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void
+nft_rule_expr_bitwise_build(struct nlmsghdr *nlh, struct nft_rule_expr *e)
+{
+ struct nft_expr_bitwise *bitwise = (struct nft_expr_bitwise *)e->data;
+
+ if (e->flags & (1 << NFT_EXPR_BITWISE_SREG))
+ mnl_attr_put_u32(nlh, NFTA_BITWISE_SREG, htonl(bitwise->sreg));
+ if (e->flags & (1 << NFT_EXPR_BITWISE_DREG))
+ mnl_attr_put_u32(nlh, NFTA_BITWISE_DREG, htonl(bitwise->dreg));
+ if (e->flags & (1 << NFT_EXPR_BITWISE_LEN))
+ mnl_attr_put_u32(nlh, NFTA_BITWISE_LEN, htonl(bitwise->len));
+ if (e->flags & (1 << NFT_EXPR_BITWISE_MASK)) {
+ struct nlattr *nest;
+
+ nest = mnl_attr_nest_start(nlh, NFTA_BITWISE_MASK);
+ mnl_attr_put(nlh, NFTA_DATA_VALUE, bitwise->mask.len,
+ bitwise->mask.val);
+ mnl_attr_nest_end(nlh, nest);
+ }
+ if (e->flags & (1 << NFT_EXPR_BITWISE_XOR)) {
+ struct nlattr *nest;
+
+ nest = mnl_attr_nest_start(nlh, NFTA_BITWISE_XOR);
+ mnl_attr_put(nlh, NFTA_DATA_VALUE, bitwise->xor.len,
+ bitwise->xor.val);
+ mnl_attr_nest_end(nlh, nest);
+ }
+}
+
+static int
+nft_rule_expr_bitwise_parse(struct nft_rule_expr *e, struct nlattr *attr)
+{
+ struct nft_expr_bitwise *bitwise = (struct nft_expr_bitwise *)e->data;
+ struct nlattr *tb[NFTA_BITWISE_MAX+1] = {};
+ int ret = 0;
+
+ if (mnl_attr_parse_nested(attr, nft_rule_expr_bitwise_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_BITWISE_SREG]) {
+ bitwise->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_BITWISE_SREG]));
+ e->flags |= (1 << NFT_EXPR_BITWISE_SREG);
+ }
+ if (tb[NFTA_BITWISE_DREG]) {
+ bitwise->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_BITWISE_DREG]));
+ e->flags |= (1 << NFT_EXPR_BITWISE_DREG);
+ }
+ if (tb[NFTA_BITWISE_LEN]) {
+ bitwise->len = ntohl(mnl_attr_get_u32(tb[NFTA_BITWISE_LEN]));
+ e->flags |= (1 << NFT_EXPR_BITWISE_LEN);
+ }
+ if (tb[NFTA_BITWISE_MASK]) {
+ ret = nft_parse_data(&bitwise->mask, tb[NFTA_BITWISE_MASK], NULL);
+ e->flags |= (1 << NFTA_BITWISE_MASK);
+ }
+ if (tb[NFTA_BITWISE_XOR]) {
+ ret = nft_parse_data(&bitwise->xor, tb[NFTA_BITWISE_XOR], NULL);
+ e->flags |= (1 << NFTA_BITWISE_XOR);
+ }
+
+ return ret;
+}
+
+static int
+nft_rule_expr_bitwise_snprintf(char *buf, size_t size, struct nft_rule_expr *e)
+{
+ struct nft_expr_bitwise *bitwise = (struct nft_expr_bitwise *)e->data;
+ int len = size, offset = 0, ret, i;
+
+ ret = snprintf(buf, len, "sreg=%u dreg=%u ",
+ bitwise->sreg, bitwise->dreg);
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+
+ ret = snprintf(buf+offset, len, " mask=");
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+
+ for (i=0; i<bitwise->mask.len/sizeof(uint32_t); i++) {
+ ret = snprintf(buf+offset, len, "%.8x ", bitwise->mask.val[i]);
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+ }
+
+ ret = snprintf(buf+offset, len, " xor=");
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+
+ for (i=0; i<bitwise->xor.len/sizeof(uint32_t); i++) {
+ ret = snprintf(buf+offset, len, "%.8x ", bitwise->xor.val[i]);
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+ }
+
+ return offset;
+}
+
+struct expr_ops expr_ops_bitwise = {
+ .name = "bitwise",
+ .alloc_len = sizeof(struct nft_expr_bitwise),
+ .max_attr = NFTA_BITWISE_MAX,
+ .set = nft_rule_expr_bitwise_set,
+ .get = nft_rule_expr_bitwise_get,
+ .parse = nft_rule_expr_bitwise_parse,
+ .build = nft_rule_expr_bitwise_build,
+ .snprintf = nft_rule_expr_bitwise_snprintf,
+};
projects / thirdparty / libnftnl.git / commitdiff
