From c3dab23793de09ab1c9b82820855fe1f723f702d Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Mon, 11 Jan 2016 19:43:01 +0100 Subject: expr: add forward expression Add forward expression for the netdev family. Signed-off-by: Pablo Neira Ayuso --- src/expr/fwd.c | 187 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 187 insertions(+) create mode 100644 src/expr/fwd.c (limited to 'src/expr') diff --git a/src/expr/fwd.c b/src/expr/fwd.c new file mode 100644 index 0000000..1131c10 --- /dev/null +++ b/src/expr/fwd.c @@ -0,0 +1,187 @@ +/* + * (C) 2015 Pablo Neira Ayuso + * + * 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 "internal.h" +#include +#include +#include +#include +#include "expr_ops.h" +#include "data_reg.h" +#include + +struct nftnl_expr_fwd { + enum nft_registers sreg_dev; +}; + +static int nftnl_expr_fwd_set(struct nftnl_expr *e, uint16_t type, + const void *data, uint32_t data_len) +{ + struct nftnl_expr_fwd *fwd = nftnl_expr_data(e); + + switch (type) { + case NFTNL_EXPR_FWD_SREG_DEV: + fwd->sreg_dev= *((uint32_t *)data); + break; + default: + return -1; + } + return 0; +} + +static const void *nftnl_expr_fwd_get(const struct nftnl_expr *e, + uint16_t type, uint32_t *data_len) +{ + struct nftnl_expr_fwd *fwd = nftnl_expr_data(e); + + switch (type) { + case NFTNL_EXPR_FWD_SREG_DEV: + *data_len = sizeof(fwd->sreg_dev); + return &fwd->sreg_dev; + } + return NULL; +} + +static int nftnl_expr_fwd_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_FWD_MAX) < 0) + return MNL_CB_OK; + + switch (type) { + case NFTA_FWD_SREG_DEV: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) + abi_breakage(); + break; + } + + tb[type] = attr; + return MNL_CB_OK; +} + +static void nftnl_expr_fwd_build(struct nlmsghdr *nlh, struct nftnl_expr *e) +{ + struct nftnl_expr_fwd *fwd = nftnl_expr_data(e); + + if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV)) + mnl_attr_put_u32(nlh, NFTA_FWD_SREG_DEV, htonl(fwd->sreg_dev)); +} + +static int nftnl_expr_fwd_parse(struct nftnl_expr *e, struct nlattr *attr) +{ + struct nftnl_expr_fwd *fwd = nftnl_expr_data(e); + struct nlattr *tb[NFTA_FWD_MAX + 1] = {}; + int ret = 0; + + if (mnl_attr_parse_nested(attr, nftnl_expr_fwd_cb, tb) < 0) + return -1; + + if (tb[NFTA_FWD_SREG_DEV]) { + fwd->sreg_dev = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_SREG_DEV])); + e->flags |= (1 << NFTNL_EXPR_FWD_SREG_DEV); + } + + return ret; +} + +static int nftnl_expr_fwd_json_parse(struct nftnl_expr *e, json_t *root, + struct nftnl_parse_err *err) +{ +#ifdef JSON_PARSING + uint32_t sreg_dev; + int ret; + + ret = nftnl_jansson_parse_val(root, "sreg_dev", NFTNL_TYPE_U32, &sreg_dev, err); + if (ret >= 0) + nftnl_expr_set_u32(e, NFTNL_EXPR_FWD_SREG_DEV, sreg_dev); + + return 0; +#else + errno = EOPNOTSUPP; + return -1; +#endif +} + +static int nftnl_expr_fwd_xml_parse(struct nftnl_expr *e, mxml_node_t *tree, + struct nftnl_parse_err *err) +{ +#ifdef XML_PARSING + uint32_t sreg_dev; + + if (nftnl_mxml_reg_parse(tree, "sreg_dev", &sreg_dev, MXML_DESCEND_FIRST, + NFTNL_XML_OPT, err) == 0) + nftnl_expr_set_u32(e, NFTNL_EXPR_FWD_SREG_DEV, sreg_dev); + + return 0; +#else + errno = EOPNOTSUPP; + return -1; +#endif +} + +static int nftnl_expr_fwd_export(char *buf, size_t size, struct nftnl_expr *e, + int type) +{ + struct nftnl_expr_fwd *fwd = nftnl_expr_data(e); + NFTNL_BUF_INIT(b, buf, size); + + if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV)) + nftnl_buf_u32(&b, type, fwd->sreg_dev, "sreg_dev"); + + return nftnl_buf_done(&b); +} + +static int nftnl_expr_fwd_snprintf_default(char *buf, size_t len, + struct nftnl_expr *e, uint32_t flags) +{ + int size = len, offset = 0, ret; + struct nftnl_expr_fwd *fwd = nftnl_expr_data(e); + + if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV)) { + ret = snprintf(buf + offset, len, "sreg_dev %u ", fwd->sreg_dev); + SNPRINTF_BUFFER_SIZE(ret, size, len, offset); + } + + return offset; +} + +static int nftnl_expr_fwd_snprintf(char *buf, size_t len, uint32_t type, + uint32_t flags, struct nftnl_expr *e) +{ + switch (type) { + case NFTNL_OUTPUT_DEFAULT: + return nftnl_expr_fwd_snprintf_default(buf, len, e, flags); + case NFTNL_OUTPUT_XML: + case NFTNL_OUTPUT_JSON: + return nftnl_expr_fwd_export(buf, len, e, type); + default: + break; + } + return -1; +} + +struct expr_ops expr_ops_fwd = { + .name = "fwd", + .alloc_len = sizeof(struct nftnl_expr_fwd), + .max_attr = NFTA_FWD_MAX, + .set = nftnl_expr_fwd_set, + .get = nftnl_expr_fwd_get, + .parse = nftnl_expr_fwd_parse, + .build = nftnl_expr_fwd_build, + .snprintf = nftnl_expr_fwd_snprintf, + .xml_parse = nftnl_expr_fwd_xml_parse, + .json_parse = nftnl_expr_fwd_json_parse, +}; -- cgit v1.2.3