--- /dev/null
+/*
+ * (C) 2016 by Laura Garcia <nevola@gmail.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 <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+
+struct nftnl_expr_hash {
+ enum nft_registers sreg;
+ enum nft_registers dreg;
+ unsigned int len;
+ unsigned int modulus;
+ unsigned int seed;
+};
+
+static int
+nftnl_expr_hash_set(struct nftnl_expr *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_expr_hash *hash = nftnl_expr_data(e);
+
+ switch (type) {
+ case NFTNL_EXPR_HASH_SREG:
+ hash->sreg = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_HASH_DREG:
+ hash->dreg = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_HASH_LEN:
+ hash->len = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_HASH_MODULUS:
+ hash->modulus = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_HASH_SEED:
+ hash->seed = *((uint32_t *)data);
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *
+nftnl_expr_hash_get(const struct nftnl_expr *e, uint16_t type,
+ uint32_t *data_len)
+{
+ struct nftnl_expr_hash *hash = nftnl_expr_data(e);
+
+ switch (type) {
+ case NFTNL_EXPR_HASH_SREG:
+ *data_len = sizeof(hash->sreg);
+ return &hash->sreg;
+ case NFTNL_EXPR_HASH_DREG:
+ *data_len = sizeof(hash->dreg);
+ return &hash->dreg;
+ case NFTNL_EXPR_HASH_LEN:
+ *data_len = sizeof(hash->len);
+ return &hash->len;
+ case NFTNL_EXPR_HASH_MODULUS:
+ *data_len = sizeof(hash->modulus);
+ return &hash->modulus;
+ case NFTNL_EXPR_HASH_SEED:
+ *data_len = sizeof(hash->seed);
+ return &hash->seed;
+ }
+ return NULL;
+}
+
+static int nftnl_expr_hash_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_HASH_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch (type) {
+ case NFTA_HASH_SREG:
+ case NFTA_HASH_DREG:
+ case NFTA_HASH_LEN:
+ case NFTA_HASH_MODULUS:
+ case NFTA_HASH_SEED:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_hash_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+ struct nftnl_expr_hash *hash = nftnl_expr_data(e);
+
+ if (e->flags & (1 << NFTNL_EXPR_HASH_SREG))
+ mnl_attr_put_u32(nlh, NFTA_HASH_SREG, htonl(hash->sreg));
+ if (e->flags & (1 << NFTNL_EXPR_HASH_DREG))
+ mnl_attr_put_u32(nlh, NFTA_HASH_DREG, htonl(hash->dreg));
+ if (e->flags & (1 << NFTNL_EXPR_HASH_LEN))
+ mnl_attr_put_u32(nlh, NFTA_HASH_LEN, htonl(hash->len));
+ if (e->flags & (1 << NFTNL_EXPR_HASH_MODULUS))
+ mnl_attr_put_u32(nlh, NFTA_HASH_MODULUS, htonl(hash->modulus));
+ if (e->flags & (1 << NFTNL_EXPR_HASH_SEED))
+ mnl_attr_put_u32(nlh, NFTA_HASH_SEED, htonl(hash->seed));
+
+}
+
+static int
+nftnl_expr_hash_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+ struct nftnl_expr_hash *hash = nftnl_expr_data(e);
+ struct nlattr *tb[NFTA_HASH_MAX+1] = {};
+ int ret = 0;
+
+ if (mnl_attr_parse_nested(attr, nftnl_expr_hash_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_HASH_SREG]) {
+ hash->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_HASH_SREG]));
+ e->flags |= (1 << NFTNL_EXPR_HASH_SREG);
+ }
+ if (tb[NFTA_HASH_DREG]) {
+ hash->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_HASH_DREG]));
+ e->flags |= (1 << NFTNL_EXPR_HASH_DREG);
+ }
+ if (tb[NFTA_HASH_LEN]) {
+ hash->len = ntohl(mnl_attr_get_u32(tb[NFTA_HASH_LEN]));
+ e->flags |= (1 << NFTNL_EXPR_HASH_LEN);
+ }
+ if (tb[NFTA_HASH_MODULUS]) {
+ hash->modulus = ntohl(mnl_attr_get_u32(tb[NFTA_HASH_MODULUS]));
+ e->flags |= (1 << NFTNL_EXPR_HASH_MODULUS);
+ }
+ if (tb[NFTA_HASH_SEED]) {
+ hash->seed = ntohl(mnl_attr_get_u32(tb[NFTA_HASH_SEED]));
+ e->flags |= (1 << NFTNL_EXPR_HASH_SEED);
+ }
+
+ return ret;
+}
+
+static int nftnl_expr_hash_json_parse(struct nftnl_expr *e, json_t *root,
+ struct nftnl_parse_err *err)
+{
+#ifdef JSON_PARSING
+ uint32_t sreg, dreg, len, modulus, seed;
+
+ if (nftnl_jansson_parse_reg(root, "sreg", NFTNL_TYPE_U32,
+ &sreg, err) == 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_HASH_SREG, sreg);
+
+ if (nftnl_jansson_parse_reg(root, "dreg", NFTNL_TYPE_U32,
+ &dreg, err) == 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_HASH_DREG, dreg);
+
+ if (nftnl_jansson_parse_val(root, "len", NFTNL_TYPE_U32,
+ &len, err) == 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_HASH_LEN, len);
+
+ if (nftnl_jansson_parse_val(root, "modulus", NFTNL_TYPE_U32,
+ &modulus, err) == 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_HASH_MODULUS, modulus);
+
+ if (nftnl_jansson_parse_val(root, "seed", NFTNL_TYPE_U32,
+ &seed, err) == 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_HASH_SEED, seed);
+
+ return 0;
+#else
+ errno = EOPNOTSUPP;
+ return -1;
+#endif
+}
+
+
+static int nftnl_expr_hash_xml_parse(struct nftnl_expr *e,
+ mxml_node_t *tree,
+ struct nftnl_parse_err *err)
+{
+#ifdef XML_PARSING
+ uint32_t sreg, dreg, len, modulus, seed;
+
+ if (nftnl_mxml_reg_parse(tree, "sreg", &sreg, MXML_DESCEND_FIRST,
+ NFTNL_XML_MAND, err) == 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_HASH_SREG, sreg);
+
+ if (nftnl_mxml_reg_parse(tree, "dreg", &dreg, MXML_DESCEND_FIRST,
+ NFTNL_XML_MAND, err) == 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_HASH_DREG, dreg);
+
+ if (nftnl_mxml_num_parse(tree, "len", MXML_DESCEND_FIRST, BASE_DEC,
+ &len, NFTNL_TYPE_U32, NFTNL_XML_MAND,
+ err) == 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_HASH_LEN, len);
+
+ if (nftnl_mxml_num_parse(tree, "modulus", MXML_DESCEND_FIRST, BASE_DEC,
+ &modulus, NFTNL_TYPE_U32, NFTNL_XML_MAND,
+ err) == 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_HASH_MODULUS, modulus);
+
+ if (nftnl_mxml_num_parse(tree, "seed", MXML_DESCEND_FIRST, BASE_DEC,
+ &seed, NFTNL_TYPE_U32, NFTNL_XML_MAND,
+ err) == 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_HASH_SEED, seed);
+
+ return 0;
+#else
+ errno = EOPNOTSUPP;
+ return -1;
+#endif
+}
+
+static int
+nftnl_expr_hash_snprintf_default(char *buf, size_t size,
+ const struct nftnl_expr *e)
+{
+ struct nftnl_expr_hash *hash = nftnl_expr_data(e);
+ int len = size, offset = 0, ret;
+
+ ret = snprintf(buf, len, "reg %u = jhash(reg %u, %u, %u) %% modulus %u",
+ hash->dreg, hash->sreg, hash->len, hash->seed,
+ hash->modulus);
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+
+ return offset;
+}
+
+static int nftnl_expr_hash_export(char *buf, size_t size,
+ const struct nftnl_expr *e, int type)
+{
+ struct nftnl_expr_hash *hash = nftnl_expr_data(e);
+
+ NFTNL_BUF_INIT(b, buf, size);
+
+ if (e->flags & (1 << NFTNL_EXPR_HASH_SREG))
+ nftnl_buf_u32(&b, type, hash->sreg, SREG);
+ if (e->flags & (1 << NFTNL_EXPR_HASH_DREG))
+ nftnl_buf_u32(&b, type, hash->dreg, DREG);
+ if (e->flags & (1 << NFTNL_EXPR_HASH_LEN))
+ nftnl_buf_u32(&b, type, hash->len, LEN);
+ if (e->flags & (1 << NFTNL_EXPR_HASH_MODULUS))
+ nftnl_buf_u32(&b, type, hash->modulus, MODULUS);
+ if (e->flags & (1 << NFTNL_EXPR_HASH_SEED))
+ nftnl_buf_u32(&b, type, hash->seed, SEED);
+
+ return nftnl_buf_done(&b);
+}
+
+static int
+nftnl_expr_hash_snprintf(char *buf, size_t len, uint32_t type,
+ uint32_t flags, const struct nftnl_expr *e)
+{
+ switch (type) {
+ case NFTNL_OUTPUT_DEFAULT:
+ return nftnl_expr_hash_snprintf_default(buf, len, e);
+ case NFTNL_OUTPUT_XML:
+ case NFTNL_OUTPUT_JSON:
+ return nftnl_expr_hash_export(buf, len, e, type);
+ default:
+ break;
+ }
+ return -1;
+}
+
+struct expr_ops expr_ops_hash = {
+ .name = "hash",
+ .alloc_len = sizeof(struct nftnl_expr_hash),
+ .max_attr = NFTA_HASH_MAX,
+ .set = nftnl_expr_hash_set,
+ .get = nftnl_expr_hash_get,
+ .parse = nftnl_expr_hash_parse,
+ .build = nftnl_expr_hash_build,
+ .snprintf = nftnl_expr_hash_snprintf,
+ .xml_parse = nftnl_expr_hash_xml_parse,
+ .json_parse = nftnl_expr_hash_json_parse,
+};
--- /dev/null
+/*
+ * (C) 2016 by Laura Garcia <nevola@gmail.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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+
+#include <linux/netfilter/nf_tables.h>
+#include <libmnl/libmnl.h>
+#include <libnftnl/rule.h>
+#include <libnftnl/expr.h>
+
+static int test_ok = 1;
+
+static void print_err(const char *msg)
+{
+ test_ok = 0;
+ printf("\033[31mERROR:\e[0m %s\n", msg);
+}
+
+static void cmp_nftnl_expr(struct nftnl_expr *rule_a,
+ struct nftnl_expr *rule_b)
+{
+ if (nftnl_expr_get_u32(rule_a, NFTNL_EXPR_HASH_SREG) !=
+ nftnl_expr_get_u32(rule_b, NFTNL_EXPR_HASH_SREG))
+ print_err("Expr NFTNL_EXPR_HASH_SREG mismatches");
+ if (nftnl_expr_get_u32(rule_a, NFTNL_EXPR_HASH_DREG) !=
+ nftnl_expr_get_u32(rule_b, NFTNL_EXPR_HASH_DREG))
+ print_err("Expr NFTNL_EXPR_HASH_DREG mismatches");
+ if (nftnl_expr_get_u32(rule_a, NFTNL_EXPR_HASH_MODULUS) !=
+ nftnl_expr_get_u32(rule_b, NFTNL_EXPR_HASH_MODULUS))
+ print_err("Expr NFTNL_EXPR_HASH_MODULUS mismatches");
+ if (nftnl_expr_get_u32(rule_a, NFTNL_EXPR_HASH_SEED) !=
+ nftnl_expr_get_u32(rule_b, NFTNL_EXPR_HASH_SEED))
+ print_err("Expr NFTNL_EXPR_HASH_SEED mismatches");
+}
+
+int main(int argc, char *argv[])
+{
+ struct nftnl_rule *a, *b;
+ struct nftnl_expr *ex;
+ struct nlmsghdr *nlh;
+ char buf[4096];
+ struct nftnl_expr_iter *iter_a, *iter_b;
+ struct nftnl_expr *rule_a, *rule_b;
+
+ a = nftnl_rule_alloc();
+ b = nftnl_rule_alloc();
+ if (a == NULL || b == NULL)
+ print_err("OOM");
+ ex = nftnl_expr_alloc("hash");
+ if (ex == NULL)
+ print_err("OOM");
+
+ nftnl_expr_set_u32(ex, NFTNL_EXPR_HASH_SREG, 0x1234568);
+ nftnl_expr_set_u32(ex, NFTNL_EXPR_HASH_DREG, 0x78123456);
+ nftnl_expr_set_u32(ex, NFTNL_EXPR_HASH_MODULUS, 0x78123456);
+ nftnl_expr_set_u32(ex, NFTNL_EXPR_HASH_SEED, 0x78123456);
+
+ nftnl_rule_add_expr(a, ex);
+
+ nlh = nftnl_rule_nlmsg_build_hdr(buf, NFT_MSG_NEWRULE, AF_INET, 0, 1234);
+ nftnl_rule_nlmsg_build_payload(nlh, a);
+ if (nftnl_rule_nlmsg_parse(nlh, b) < 0)
+ print_err("parsing problems");
+
+ iter_a = nftnl_expr_iter_create(a);
+ iter_b = nftnl_expr_iter_create(b);
+ if (iter_a == NULL || iter_b == NULL)
+ print_err("OOM");
+
+ rule_a = nftnl_expr_iter_next(iter_a);
+ rule_b = nftnl_expr_iter_next(iter_b);
+ if (rule_a == NULL || rule_b == NULL)
+ print_err("OOM");
+
+ cmp_nftnl_expr(rule_a, rule_b);
+
+ if (nftnl_expr_iter_next(iter_a) != NULL ||
+ nftnl_expr_iter_next(iter_b) != NULL)
+ print_err("More 1 expr.");
+
+ nftnl_expr_iter_destroy(iter_a);
+ nftnl_expr_iter_destroy(iter_b);
+ nftnl_rule_free(a);
+ nftnl_rule_free(b);
+
+ if (!test_ok)
+ exit(EXIT_FAILURE);
+
+ printf("%s: \033[32mOK\e[0m\n", argv[0]);
+ return EXIT_SUCCESS;
+}
projects / thirdparty / libnftnl.git / commitdiff
