From a99bbaf829eea8d2423f28c11531422bfcd21ed5 Mon Sep 17 00:00:00 2001 From: "Pablo M. Bermudo Garay" Date: Wed, 23 Aug 2017 22:42:24 +0200 Subject: src: limit stateful object support This patch adds support for a new type of stateful object: limit. Signed-off-by: Pablo M. Bermudo Garay Signed-off-by: Pablo Neira Ayuso --- src/Makefile.am | 1 + src/obj/limit.c | 238 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ src/object.c | 3 +- 3 files changed, 241 insertions(+), 1 deletion(-) create mode 100644 src/obj/limit.c (limited to 'src') diff --git a/src/Makefile.am b/src/Makefile.am index 77b67b2..59ddf6a 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -55,4 +55,5 @@ libnftnl_la_SOURCES = utils.c \ obj/counter.c \ obj/ct_helper.c \ obj/quota.c \ + obj/limit.c \ libnftnl.map diff --git a/src/obj/limit.c b/src/obj/limit.c new file mode 100644 index 0000000..8cf0faa --- /dev/null +++ b/src/obj/limit.c @@ -0,0 +1,238 @@ +/* + * Copyright (c) 2017 Pablo M. Bermudo Garay + * + * 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 +#include +#include +#include +#include + +#include + +#include "internal.h" +#include +#include + +#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: + limit->rate = *((uint64_t *)data); + break; + case NFTNL_OBJ_LIMIT_UNIT: + limit->unit = *((uint64_t *)data); + break; + case NFTNL_OBJ_LIMIT_BURST: + limit->burst = *((uint32_t *)data); + break; + case NFTNL_OBJ_LIMIT_TYPE: + limit->type = *((uint32_t *)data); + break; + case NFTNL_OBJ_LIMIT_FLAGS: + limit->flags = *((uint32_t *)data); + 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_json_parse(struct nftnl_obj *e, json_t *root, + struct nftnl_parse_err *err) +{ +#ifdef JSON_PARSING + uint64_t uval64; + uint32_t uval32; + + if (nftnl_jansson_parse_val(root, "rate", NFTNL_TYPE_U64, &uval64, + err) == 0) + nftnl_obj_set_u64(e, NFTNL_OBJ_LIMIT_RATE, uval64); + if (nftnl_jansson_parse_val(root, "unit", NFTNL_TYPE_U64, &uval64, + err) == 0) + nftnl_obj_set_u64(e, NFTNL_OBJ_LIMIT_UNIT, uval64); + if (nftnl_jansson_parse_val(root, "burst", NFTNL_TYPE_U32, &uval32, + err) == 0) + nftnl_obj_set_u32(e, NFTNL_OBJ_LIMIT_BURST, uval32); + if (nftnl_jansson_parse_val(root, "type", NFTNL_TYPE_U32, &uval32, + err) == 0) + nftnl_obj_set_u32(e, NFTNL_OBJ_LIMIT_TYPE, uval32); + if (nftnl_jansson_parse_val(root, "flags", NFTNL_TYPE_U32, &uval32, + err) == 0) + nftnl_obj_set_u32(e, NFTNL_OBJ_LIMIT_FLAGS, uval32); + + return 0; +#else + errno = EOPNOTSUPP; + return -1; +#endif +} + +static int nftnl_obj_limit_export(char *buf, size_t size, + const struct nftnl_obj *e, int type) +{ + struct nftnl_obj_limit *limit = nftnl_obj_data(e); + NFTNL_BUF_INIT(b, buf, size); + + if (e->flags & (1 << NFTNL_OBJ_LIMIT_RATE)) + nftnl_buf_u64(&b, type, limit->rate, RATE); + if (e->flags & (1 << NFTNL_OBJ_LIMIT_UNIT)) + nftnl_buf_u64(&b, type, limit->unit, UNIT); + if (e->flags & (1 << NFTNL_OBJ_LIMIT_BURST)) + nftnl_buf_u32(&b, type, limit->burst, BURST); + if (e->flags & (1 << NFTNL_OBJ_LIMIT_TYPE)) + nftnl_buf_u32(&b, type, limit->type, TYPE); + if (e->flags & (1 << NFTNL_OBJ_LIMIT_FLAGS)) + nftnl_buf_u32(&b, type, limit->flags, FLAGS); + + return nftnl_buf_done(&b); +} + +static int nftnl_obj_limit_snprintf_default(char *buf, size_t len, + 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); +} + +static int nftnl_obj_limit_snprintf(char *buf, size_t len, uint32_t type, + uint32_t flags, + const struct nftnl_obj *e) +{ + switch (type) { + case NFTNL_OUTPUT_DEFAULT: + return nftnl_obj_limit_snprintf_default(buf, len, e); + case NFTNL_OUTPUT_XML: + case NFTNL_OUTPUT_JSON: + return nftnl_obj_limit_export(buf, len, e, type); + default: + break; + } + return -1; +} + +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, + .snprintf = nftnl_obj_limit_snprintf, + .json_parse = nftnl_obj_limit_json_parse, +}; diff --git a/src/object.c b/src/object.c index e1a5ac4..9dc5b41 100644 --- a/src/object.c +++ b/src/object.c @@ -29,11 +29,12 @@ static struct obj_ops *obj_ops[] = { [NFT_OBJECT_COUNTER] = &obj_ops_counter, [NFT_OBJECT_QUOTA] = &obj_ops_quota, [NFT_OBJECT_CT_HELPER] = &obj_ops_ct_helper, + [NFT_OBJECT_LIMIT] = &obj_ops_limit, }; static struct obj_ops *nftnl_obj_ops_lookup(uint32_t type) { - if (type > NFT_OBJECT_CT_HELPER) + if (type > NFT_OBJECT_MAX) return NULL; return obj_ops[type]; -- cgit v1.2.3