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Diffstat (limited to '')
| -rw-r--r-- | src/expr/quota.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/src/expr/quota.c b/src/expr/quota.c new file mode 100644 index 0000000..835729c --- /dev/null +++ b/src/expr/quota.c @@ -0,0 +1,151 @@ +/* + * (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; + uint64_t consumed; + 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: + memcpy("a->bytes, data, sizeof(quota->bytes)); + break; + case NFTNL_EXPR_QUOTA_CONSUMED: + memcpy("a->consumed, data, sizeof(quota->consumed)); + break; + case NFTNL_EXPR_QUOTA_FLAGS: + memcpy("a->flags, data, sizeof(quota->flags)); + 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_CONSUMED: + *data_len = sizeof(quota->consumed); + return "a->consumed; + 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: + case NFTA_QUOTA_CONSUMED: + 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_CONSUMED)) + mnl_attr_put_u64(nlh, NFTA_QUOTA_CONSUMED, htobe64(quota->consumed)); + 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_CONSUMED]) { + quota->consumed = be64toh(mnl_attr_get_u64(tb[NFTA_QUOTA_CONSUMED])); + e->flags |= (1 << NFTNL_EXPR_QUOTA_CONSUMED); + } + 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_snprintf(char *buf, size_t len, + uint32_t flags, + const struct nftnl_expr *e) +{ + struct nftnl_expr_quota *quota = nftnl_expr_data(e); + + return snprintf(buf, len, + "bytes %"PRIu64" consumed %"PRIu64" flags %u ", + quota->bytes, quota->consumed, quota->flags); +} + +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, + .output = nftnl_expr_quota_snprintf, +}; |