diff options
Diffstat (limited to 'src/expr/quota.c')
| -rw-r--r-- | src/expr/quota.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/src/expr/quota.c b/src/expr/quota.c new file mode 100644 index 0000000..47db62f --- /dev/null +++ b/src/expr/quota.c @@ -0,0 +1,210 @@ +/* + * (C) 2016 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. + */ + +#include <stdio.h> +#include <stdint.h> +#include <arpa/inet.h> +#include <errno.h> +#include <inttypes.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_quota { + uint64_t bytes; + uint32_t flags; +}; + +static int nftnl_expr_quota_set(struct nftnl_expr *e, uint16_t type, + const void *data, uint32_t data_len) +{ + struct nftnl_expr_quota *quota = nftnl_expr_data(e); + + switch (type) { + case NFTNL_EXPR_QUOTA_BYTES: + quota->bytes = *((uint64_t *)data); + break; + case NFTNL_EXPR_QUOTA_FLAGS: + quota->flags = *((uint32_t *)data); + break; + default: + return -1; + } + return 0; +} + +static const void *nftnl_expr_quota_get(const struct nftnl_expr *e, + uint16_t type, uint32_t *data_len) +{ + struct nftnl_expr_quota *quota = nftnl_expr_data(e); + + switch (type) { + case NFTNL_EXPR_QUOTA_BYTES: + *data_len = sizeof(quota->bytes); + return "a->bytes; + case NFTNL_EXPR_QUOTA_FLAGS: + *data_len = sizeof(quota->flags); + return "a->flags; + } + return NULL; +} + +static int nftnl_expr_quota_cb(const struct nlattr *attr, void *data) +{ + int type = mnl_attr_get_type(attr); + const struct nlattr **tb = data; + + if (mnl_attr_type_valid(attr, NFTA_QUOTA_MAX) < 0) + return MNL_CB_OK; + + switch(type) { + case NFTA_QUOTA_BYTES: + if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0) + abi_breakage(); + break; + case NFTA_QUOTA_FLAGS: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) + abi_breakage(); + break; + } + + tb[type] = attr; + return MNL_CB_OK; +} + +static void +nftnl_expr_quota_build(struct nlmsghdr *nlh, const struct nftnl_expr *e) +{ + struct nftnl_expr_quota *quota = nftnl_expr_data(e); + + if (e->flags & (1 << NFTNL_EXPR_QUOTA_BYTES)) + mnl_attr_put_u64(nlh, NFTA_QUOTA_BYTES, htobe64(quota->bytes)); + if (e->flags & (1 << NFTNL_EXPR_QUOTA_FLAGS)) + mnl_attr_put_u32(nlh, NFTA_QUOTA_FLAGS, htonl(quota->flags)); +} + +static int +nftnl_expr_quota_parse(struct nftnl_expr *e, struct nlattr *attr) +{ + struct nftnl_expr_quota *quota = nftnl_expr_data(e); + struct nlattr *tb[NFTA_QUOTA_MAX + 1] = {}; + + if (mnl_attr_parse_nested(attr, nftnl_expr_quota_cb, tb) < 0) + return -1; + + if (tb[NFTA_QUOTA_BYTES]) { + quota->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_QUOTA_BYTES])); + e->flags |= (1 << NFTNL_EXPR_QUOTA_BYTES); + } + if (tb[NFTA_QUOTA_FLAGS]) { + quota->flags = ntohl(mnl_attr_get_u32(tb[NFTA_QUOTA_FLAGS])); + e->flags |= (1 << NFTNL_EXPR_QUOTA_FLAGS); + } + + return 0; +} + +static int +nftnl_expr_quota_json_parse(struct nftnl_expr *e, json_t *root, + struct nftnl_parse_err *err) +{ +#ifdef JSON_PARSING + uint64_t bytes; + uint32_t flags; + + if (nftnl_jansson_parse_val(root, "bytes", NFTNL_TYPE_U64, &bytes, + err) == 0) + nftnl_expr_set_u64(e, NFTNL_EXPR_QUOTA_BYTES, bytes); + if (nftnl_jansson_parse_val(root, "flags", NFTNL_TYPE_U32, &flags, + err) == 0) + nftnl_expr_set_u32(e, NFTNL_EXPR_QUOTA_FLAGS, flags); + + return 0; +#else + errno = EOPNOTSUPP; + return -1; +#endif +} + +static int nftnl_expr_quota_xml_parse(struct nftnl_expr *e, mxml_node_t *tree, + struct nftnl_parse_err *err) +{ +#ifdef XML_PARSING + uint64_t bytes; + uint32_t flags; + + if (nftnl_mxml_num_parse(tree, "bytes", MXML_DESCEND_FIRST, BASE_DEC, + &bytes, NFTNL_TYPE_U64, NFTNL_XML_MAND, err) == 0) + nftnl_expr_set_u64(e, NFTNL_EXPR_QUOTA_BYTES, bytes); + if (nftnl_mxml_num_parse(tree, "flags", MXML_DESCEND_FIRST, BASE_DEC, + &flags, NFTNL_TYPE_U32, NFTNL_XML_MAND, err) == 0) + nftnl_expr_set_u32(e, NFTNL_EXPR_QUOTA_FLAGS, flags); + + return 0; +#else + errno = EOPNOTSUPP; + return -1; +#endif +} + +static int nftnl_expr_quota_export(char *buf, size_t size, + const struct nftnl_expr *e, int type) +{ + struct nftnl_expr_quota *quota = nftnl_expr_data(e); + NFTNL_BUF_INIT(b, buf, size); + + if (e->flags & (1 << NFTNL_EXPR_QUOTA_BYTES)) + nftnl_buf_u64(&b, type, quota->bytes, BYTES); + if (e->flags & (1 << NFTNL_EXPR_QUOTA_FLAGS)) + nftnl_buf_u32(&b, type, quota->flags, FLAGS); + + return nftnl_buf_done(&b); +} + +static int nftnl_expr_quota_snprintf_default(char *buf, size_t len, + const struct nftnl_expr *e) +{ + struct nftnl_expr_quota *quota = nftnl_expr_data(e); + + return snprintf(buf, len, "bytes %"PRIu64" flags %u ", + quota->bytes, quota->flags); +} + +static int nftnl_expr_quota_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_quota_snprintf_default(buf, len, e); + case NFTNL_OUTPUT_XML: + case NFTNL_OUTPUT_JSON: + return nftnl_expr_quota_export(buf, len, e, type); + default: + break; + } + return -1; +} + +struct expr_ops expr_ops_quota = { + .name = "quota", + .alloc_len = sizeof(struct nftnl_expr_quota), + .max_attr = NFTA_QUOTA_MAX, + .set = nftnl_expr_quota_set, + .get = nftnl_expr_quota_get, + .parse = nftnl_expr_quota_parse, + .build = nftnl_expr_quota_build, + .snprintf = nftnl_expr_quota_snprintf, + .xml_parse = nftnl_expr_quota_xml_parse, + .json_parse = nftnl_expr_quota_json_parse, +}; |