diff options
Diffstat (limited to 'src/obj/limit.c')
| -rw-r--r-- | src/obj/limit.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/src/obj/limit.c b/src/obj/limit.c new file mode 100644 index 0000000..d7b1aed --- /dev/null +++ b/src/obj/limit.c @@ -0,0 +1,172 @@ +/* + * Copyright (c) 2017 Pablo M. Bermudo Garay <pablombg@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 <arpa/inet.h> +#include <errno.h> +#include <inttypes.h> + +#include <linux/netfilter/nf_tables.h> + +#include "internal.h" +#include <libmnl/libmnl.h> +#include <libnftnl/object.h> + +#include "obj.h" + +static int nftnl_obj_limit_set(struct nftnl_obj *e, uint16_t type, + const void *data, uint32_t data_len) +{ + struct nftnl_obj_limit *limit = nftnl_obj_data(e); + + switch (type) { + case NFTNL_OBJ_LIMIT_RATE: + memcpy(&limit->rate, data, sizeof(limit->rate)); + break; + case NFTNL_OBJ_LIMIT_UNIT: + memcpy(&limit->unit, data, sizeof(limit->unit)); + break; + case NFTNL_OBJ_LIMIT_BURST: + memcpy(&limit->burst, data, sizeof(limit->burst)); + break; + case NFTNL_OBJ_LIMIT_TYPE: + memcpy(&limit->type, data, sizeof(limit->type)); + break; + case NFTNL_OBJ_LIMIT_FLAGS: + memcpy(&limit->flags, data, sizeof(limit->flags)); + break; + default: + return -1; + } + return 0; +} + +static const void *nftnl_obj_limit_get(const struct nftnl_obj *e, + uint16_t type, uint32_t *data_len) +{ + struct nftnl_obj_limit *limit = nftnl_obj_data(e); + + switch (type) { + case NFTNL_OBJ_LIMIT_RATE: + *data_len = sizeof(limit->rate); + return &limit->rate; + case NFTNL_OBJ_LIMIT_UNIT: + *data_len = sizeof(limit->unit); + return &limit->unit; + case NFTNL_OBJ_LIMIT_BURST: + *data_len = sizeof(limit->burst); + return &limit->burst; + case NFTNL_OBJ_LIMIT_TYPE: + *data_len = sizeof(limit->type); + return &limit->type; + case NFTNL_OBJ_LIMIT_FLAGS: + *data_len = sizeof(limit->flags); + return &limit->flags; + } + return NULL; +} + +static int nftnl_obj_limit_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_LIMIT_MAX) < 0) + return MNL_CB_OK; + + switch (type) { + case NFTA_LIMIT_RATE: + case NFTA_LIMIT_UNIT: + if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0) + abi_breakage(); + break; + case NFTA_LIMIT_BURST: + case NFTA_LIMIT_TYPE: + case NFTA_LIMIT_FLAGS: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) + abi_breakage(); + break; + } + + tb[type] = attr; + return MNL_CB_OK; +} + +static void nftnl_obj_limit_build(struct nlmsghdr *nlh, + const struct nftnl_obj *e) +{ + struct nftnl_obj_limit *limit = nftnl_obj_data(e); + + if (e->flags & (1 << NFTNL_OBJ_LIMIT_RATE)) + mnl_attr_put_u64(nlh, NFTA_LIMIT_RATE, htobe64(limit->rate)); + if (e->flags & (1 << NFTNL_OBJ_LIMIT_UNIT)) + mnl_attr_put_u64(nlh, NFTA_LIMIT_UNIT, htobe64(limit->unit)); + if (e->flags & (1 << NFTNL_OBJ_LIMIT_BURST)) + mnl_attr_put_u32(nlh, NFTA_LIMIT_BURST, htonl(limit->burst)); + if (e->flags & (1 << NFTNL_OBJ_LIMIT_TYPE)) + mnl_attr_put_u32(nlh, NFTA_LIMIT_TYPE, htonl(limit->type)); + if (e->flags & (1 << NFTNL_OBJ_LIMIT_FLAGS)) + mnl_attr_put_u32(nlh, NFTA_LIMIT_FLAGS, htonl(limit->flags)); +} + +static int nftnl_obj_limit_parse(struct nftnl_obj *e, struct nlattr *attr) +{ + struct nftnl_obj_limit *limit = nftnl_obj_data(e); + struct nlattr *tb[NFTA_LIMIT_MAX + 1] = {}; + + if (mnl_attr_parse_nested(attr, nftnl_obj_limit_cb, tb) < 0) + return -1; + + if (tb[NFTA_LIMIT_RATE]) { + limit->rate = be64toh(mnl_attr_get_u64(tb[NFTA_LIMIT_RATE])); + e->flags |= (1 << NFTNL_OBJ_LIMIT_RATE); + } + if (tb[NFTA_LIMIT_UNIT]) { + limit->unit = be64toh(mnl_attr_get_u64(tb[NFTA_LIMIT_UNIT])); + e->flags |= (1 << NFTNL_OBJ_LIMIT_UNIT); + } + if (tb[NFTA_LIMIT_BURST]) { + limit->burst = ntohl(mnl_attr_get_u32(tb[NFTA_LIMIT_BURST])); + e->flags |= (1 << NFTNL_OBJ_LIMIT_BURST); + } + if (tb[NFTA_LIMIT_TYPE]) { + limit->type = ntohl(mnl_attr_get_u32(tb[NFTA_LIMIT_TYPE])); + e->flags |= (1 << NFTNL_OBJ_LIMIT_TYPE); + } + if (tb[NFTA_LIMIT_FLAGS]) { + limit->flags = ntohl(mnl_attr_get_u32(tb[NFTA_LIMIT_FLAGS])); + e->flags |= (1 << NFTNL_OBJ_LIMIT_FLAGS); + } + + return 0; +} + +static int nftnl_obj_limit_snprintf(char *buf, size_t len, + uint32_t flags, + const struct nftnl_obj *e) +{ + struct nftnl_obj_limit *limit = nftnl_obj_data(e); + + return snprintf(buf, len, "rate %"PRIu64" unit %"PRIu64" burst %u " + "type %u flags %u ", limit->rate, limit->unit, + limit->burst, limit->type, limit->flags); +} + +struct obj_ops obj_ops_limit = { + .name = "limit", + .type = NFT_OBJECT_LIMIT, + .alloc_len = sizeof(struct nftnl_obj_limit), + .max_attr = NFTA_LIMIT_MAX, + .set = nftnl_obj_limit_set, + .get = nftnl_obj_limit_get, + .parse = nftnl_obj_limit_parse, + .build = nftnl_obj_limit_build, + .output = nftnl_obj_limit_snprintf, +}; |