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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-09 13:04:34 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-09 13:04:34 +0000 |
commit | 371c8a8bca2b6862226bc79c13d143e07c1d8fc3 (patch) | |
tree | 06c7dc8826596690422e79d5bde2f46c90492de3 /src/expr/objref.c | |
parent | Initial commit. (diff) | |
download | libnftnl-upstream.tar.xz libnftnl-upstream.zip |
Adding upstream version 1.2.6.upstream/1.2.6upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/expr/objref.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/src/expr/objref.c b/src/expr/objref.c new file mode 100644 index 0000000..ad0688f --- /dev/null +++ b/src/expr/objref.c @@ -0,0 +1,209 @@ +/* + * (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_objref { + struct { + uint32_t type; + const char *name; + } imm; + struct { + uint32_t sreg; + const char *name; + uint32_t id; + } set; +}; + +static int nftnl_expr_objref_set(struct nftnl_expr *e, uint16_t type, + const void *data, uint32_t data_len) +{ + struct nftnl_expr_objref *objref = nftnl_expr_data(e); + + switch(type) { + case NFTNL_EXPR_OBJREF_IMM_TYPE: + memcpy(&objref->imm.type, data, sizeof(objref->imm.type)); + break; + case NFTNL_EXPR_OBJREF_IMM_NAME: + objref->imm.name = strdup(data); + if (!objref->imm.name) + return -1; + break; + case NFTNL_EXPR_OBJREF_SET_SREG: + memcpy(&objref->set.sreg, data, sizeof(objref->set.sreg)); + break; + case NFTNL_EXPR_OBJREF_SET_NAME: + objref->set.name = strdup(data); + if (!objref->set.name) + return -1; + break; + case NFTNL_EXPR_OBJREF_SET_ID: + memcpy(&objref->set.id, data, sizeof(objref->set.id)); + break; + default: + return -1; + } + return 0; +} + +static const void *nftnl_expr_objref_get(const struct nftnl_expr *e, + uint16_t type, uint32_t *data_len) +{ + struct nftnl_expr_objref *objref = nftnl_expr_data(e); + + switch(type) { + case NFTNL_EXPR_OBJREF_IMM_TYPE: + *data_len = sizeof(objref->imm.type); + return &objref->imm.type; + case NFTNL_EXPR_OBJREF_IMM_NAME: + *data_len = strlen(objref->imm.name) + 1; + return objref->imm.name; + case NFTNL_EXPR_OBJREF_SET_SREG: + *data_len = sizeof(objref->set.sreg); + return &objref->set.sreg; + case NFTNL_EXPR_OBJREF_SET_NAME: + *data_len = strlen(objref->set.name) + 1; + return objref->set.name; + case NFTNL_EXPR_OBJREF_SET_ID: + *data_len = sizeof(objref->set.id); + return &objref->set.id; + } + return NULL; +} + +static int nftnl_expr_objref_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_OBJREF_MAX) < 0) + return MNL_CB_OK; + + switch(type) { + case NFTA_OBJREF_IMM_TYPE: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) + abi_breakage(); + break; + case NFTA_OBJREF_IMM_NAME: + case NFTA_OBJREF_SET_NAME: + if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) + abi_breakage(); + break; + case NFTA_OBJREF_SET_SREG: + case NFTA_OBJREF_SET_ID: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) + abi_breakage(); + break; + } + + tb[type] = attr; + return MNL_CB_OK; +} + +static void nftnl_expr_objref_build(struct nlmsghdr *nlh, + const struct nftnl_expr *e) +{ + struct nftnl_expr_objref *objref = nftnl_expr_data(e); + + if (e->flags & (1 << NFTNL_EXPR_OBJREF_IMM_TYPE)) + mnl_attr_put_u32(nlh, NFTA_OBJREF_IMM_TYPE, + htonl(objref->imm.type)); + if (e->flags & (1 << NFTNL_EXPR_OBJREF_IMM_NAME)) + mnl_attr_put_str(nlh, NFTA_OBJREF_IMM_NAME, objref->imm.name); + if (e->flags & (1 << NFTNL_EXPR_OBJREF_SET_SREG)) + mnl_attr_put_u32(nlh, NFTA_OBJREF_SET_SREG, + htonl(objref->set.sreg)); + if (e->flags & (1 << NFTNL_EXPR_OBJREF_SET_NAME)) + mnl_attr_put_str(nlh, NFTA_OBJREF_SET_NAME, objref->set.name); + if (e->flags & (1 << NFTNL_EXPR_OBJREF_SET_ID)) + mnl_attr_put_u32(nlh, NFTA_OBJREF_SET_ID, + htonl(objref->set.id)); +} + +static int nftnl_expr_objref_parse(struct nftnl_expr *e, struct nlattr *attr) +{ + struct nftnl_expr_objref *objref = nftnl_expr_data(e); + struct nlattr *tb[NFTA_OBJREF_MAX + 1] = {}; + + if (mnl_attr_parse_nested(attr, nftnl_expr_objref_cb, tb) < 0) + return -1; + + if (tb[NFTA_OBJREF_IMM_TYPE]) { + objref->imm.type = + ntohl(mnl_attr_get_u32(tb[NFTA_OBJREF_IMM_TYPE])); + e->flags |= (1 << NFTNL_EXPR_OBJREF_IMM_TYPE); + } + if (tb[NFTA_OBJREF_IMM_NAME]) { + objref->imm.name = + strdup(mnl_attr_get_str(tb[NFTA_OBJREF_IMM_NAME])); + e->flags |= (1 << NFTNL_EXPR_OBJREF_IMM_NAME); + } + if (tb[NFTA_OBJREF_SET_SREG]) { + objref->set.sreg = + ntohl(mnl_attr_get_u32(tb[NFTA_OBJREF_SET_SREG])); + e->flags |= (1 << NFTNL_EXPR_OBJREF_SET_SREG); + } + if (tb[NFTA_OBJREF_SET_NAME]) { + objref->set.name = + strdup(mnl_attr_get_str(tb[NFTA_OBJREF_SET_NAME])); + e->flags |= (1 << NFTNL_EXPR_OBJREF_SET_NAME); + } + if (tb[NFTA_OBJREF_SET_ID]) { + objref->set.id = + ntohl(mnl_attr_get_u32(tb[NFTA_OBJREF_SET_ID])); + e->flags |= (1 << NFTNL_EXPR_OBJREF_SET_ID); + } + + return 0; +} + +static int nftnl_expr_objref_snprintf(char *buf, size_t len, + uint32_t flags, + const struct nftnl_expr *e) +{ + struct nftnl_expr_objref *objref = nftnl_expr_data(e); + + if (e->flags & (1 << NFTNL_EXPR_OBJREF_SET_SREG)) + return snprintf(buf, len, "sreg %u set %s ", + objref->set.sreg, objref->set.name); + else + return snprintf(buf, len, "type %u name %s ", + objref->imm.type, objref->imm.name); +} + +static void nftnl_expr_objref_free(const struct nftnl_expr *e) +{ + struct nftnl_expr_objref *objref = nftnl_expr_data(e); + + xfree(objref->imm.name); + xfree(objref->set.name); +} + +struct expr_ops expr_ops_objref = { + .name = "objref", + .alloc_len = sizeof(struct nftnl_expr_objref), + .max_attr = NFTA_OBJREF_MAX, + .free = nftnl_expr_objref_free, + .set = nftnl_expr_objref_set, + .get = nftnl_expr_objref_get, + .parse = nftnl_expr_objref_parse, + .build = nftnl_expr_objref_build, + .output = nftnl_expr_objref_snprintf, +}; |