/* SPDX-License-Identifier: GPL-2.0 */ #ifndef GENL_MAGIC_FUNC_H #define GENL_MAGIC_FUNC_H #include <linux/args.h> #include <linux/build_bug.h> #include <linux/genl_magic_struct.h> /* * Magic: declare tla policy {{{1 * Magic: declare nested policies * {{{2 */ #undef GENL_mc_group #define GENL_mc_group(group) … #undef GENL_notification #define GENL_notification(op_name, op_num, mcast_group, tla_list) … #undef GENL_op #define GENL_op(op_name, op_num, handler, tla_list) … #undef GENL_struct #define GENL_struct(tag_name, tag_number, s_name, s_fields) … static struct nla_policy CONCATENATE(GENL_MAGIC_FAMILY, _tla_nl_policy)[] = …; #undef GENL_struct #define GENL_struct(tag_name, tag_number, s_name, s_fields) … #undef __field #define __field(attr_nr, attr_flag, name, nla_type, _type, __get, \ __put, __is_signed) … #undef __array #define __array(attr_nr, attr_flag, name, nla_type, _type, maxlen, \ __get, __put, __is_signed) … #include GENL_MAGIC_INCLUDE_FILE #ifndef __KERNEL__ #ifndef pr_info #define pr_info … #endif #endif #ifdef GENL_MAGIC_DEBUG static void dprint_field(const char *dir, int nla_type, const char *name, void *valp) { __u64 val = valp ? *(__u32 *)valp : 1; switch (nla_type) { case NLA_U8: val = (__u8)val; case NLA_U16: val = (__u16)val; case NLA_U32: val = (__u32)val; pr_info("%s attr %s: %d 0x%08x\n", dir, name, (int)val, (unsigned)val); break; case NLA_U64: val = *(__u64*)valp; pr_info("%s attr %s: %lld 0x%08llx\n", dir, name, (long long)val, (unsigned long long)val); break; case NLA_FLAG: if (val) pr_info("%s attr %s: set\n", dir, name); break; } } static void dprint_array(const char *dir, int nla_type, const char *name, const char *val, unsigned len) { switch (nla_type) { case NLA_NUL_STRING: if (len && val[len-1] == '\0') len--; pr_info("%s attr %s: [len:%u] '%s'\n", dir, name, len, val); break; default: /* we can always show 4 byte, * thats what nlattr are aligned to. */ pr_info("%s attr %s: [len:%u] %02x%02x%02x%02x ...\n", dir, name, len, val[0], val[1], val[2], val[3]); } } #define DPRINT_TLA … /* Name is a member field name of the struct s. * If s is NULL (only parsing, no copy requested in *_from_attrs()), * nla is supposed to point to the attribute containing the information * corresponding to that struct member. */ #define DPRINT_FIELD … #define DPRINT_ARRAY … #else #define DPRINT_TLA(a, op, b) … #define DPRINT_FIELD(dir, nla_type, name, s, nla) … #define DPRINT_ARRAY(dir, nla_type, name, s, nla) … #endif /* * Magic: provide conversion functions {{{1 * populate struct from attribute table: * {{{2 */ /* processing of generic netlink messages is serialized. * use one static buffer for parsing of nested attributes */ static struct nlattr *nested_attr_tb[128]; #undef GENL_struct #define GENL_struct(tag_name, tag_number, s_name, s_fields) … \ #define __assign(attr_nr, attr_flag, name, nla_type, type, assignment...) … #undef __field #define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \ __is_signed) … /* validate_nla() already checked nla_len <= maxlen appropriately. */ #undef __array #define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, \ __get, __put, __is_signed) … #include GENL_MAGIC_INCLUDE_FILE #undef GENL_struct #define GENL_struct(tag_name, tag_number, s_name, s_fields) … /* * Magic: define op number to op name mapping {{{1 * {{{2 */ static const char *CONCATENATE(GENL_MAGIC_FAMILY, _genl_cmd_to_str)(__u8 cmd) { … } #ifdef __KERNEL__ #include <linux/stringify.h> /* * Magic: define genl_ops {{{1 * {{{2 */ #undef GENL_op #define GENL_op(op_name, op_num, handler, tla_list) … #define ZZZ_genl_ops … static struct genl_ops ZZZ_genl_ops[] __read_mostly = …; #undef GENL_op #define GENL_op(op_name, op_num, handler, tla_list) … /* * Define the genl_family, multicast groups, {{{1 * and provide register/unregister functions. * {{{2 */ #define ZZZ_genl_family … static struct genl_family ZZZ_genl_family; /* * Magic: define multicast groups * Magic: define multicast group registration helper */ #define ZZZ_genl_mcgrps … static const struct genl_multicast_group ZZZ_genl_mcgrps[] = …; enum CONCATENATE(GENL_MAGIC_FAMILY, group_ids) { … }; #undef GENL_mc_group #define GENL_mc_group(group) … #include GENL_MAGIC_INCLUDE_FILE #undef GENL_mc_group #define GENL_mc_group(group) … static struct genl_family ZZZ_genl_family __ro_after_init = …; int CONCATENATE(GENL_MAGIC_FAMILY, _genl_register)(void) { … } void CONCATENATE(GENL_MAGIC_FAMILY, _genl_unregister)(void) { … } /* * Magic: provide conversion functions {{{1 * populate skb from struct. * {{{2 */ #undef GENL_op #define GENL_op(op_name, op_num, handler, tla_list) … #undef GENL_struct #define GENL_struct(tag_name, tag_number, s_name, s_fields) … #undef __field #define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \ __is_signed) … #undef __array #define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, \ __get, __put, __is_signed) … #include GENL_MAGIC_INCLUDE_FILE /* Functions for initializing structs to default values. */ #undef __field #define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \ __is_signed) … #undef __array #define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, \ __get, __put, __is_signed) … #undef __u32_field_def #define __u32_field_def(attr_nr, attr_flag, name, default) … #undef __s32_field_def #define __s32_field_def(attr_nr, attr_flag, name, default) … #undef __flg_field_def #define __flg_field_def(attr_nr, attr_flag, name, default) … #undef __str_field_def #define __str_field_def(attr_nr, attr_flag, name, maxlen) … #undef GENL_struct #define GENL_struct(tag_name, tag_number, s_name, s_fields) … #include GENL_MAGIC_INCLUDE_FILE #endif /* __KERNEL__ */ /* }}}1 */ #endif /* GENL_MAGIC_FUNC_H */
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