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413 lines
12 KiB
413 lines
12 KiB
#ifndef GENL_MAGIC_FUNC_H |
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#define GENL_MAGIC_FUNC_H |
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#include <linux/genl_magic_struct.h> |
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/* |
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* Magic: declare tla policy {{{1 |
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* Magic: declare nested policies |
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* {{{2 |
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*/ |
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#undef GENL_mc_group |
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#define GENL_mc_group(group) |
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#undef GENL_notification |
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#define GENL_notification(op_name, op_num, mcast_group, tla_list) |
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#undef GENL_op |
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#define GENL_op(op_name, op_num, handler, tla_list) |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) \ |
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[tag_name] = { .type = NLA_NESTED }, |
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static struct nla_policy CONCAT_(GENL_MAGIC_FAMILY, _tla_nl_policy)[] = { |
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#include GENL_MAGIC_INCLUDE_FILE |
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}; |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) \ |
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static struct nla_policy s_name ## _nl_policy[] __read_mostly = \ |
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{ s_fields }; |
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#undef __field |
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#define __field(attr_nr, attr_flag, name, nla_type, _type, __get, \ |
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__put, __is_signed) \ |
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[attr_nr] = { .type = nla_type }, |
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#undef __array |
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#define __array(attr_nr, attr_flag, name, nla_type, _type, maxlen, \ |
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__get, __put, __is_signed) \ |
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[attr_nr] = { .type = nla_type, \ |
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.len = maxlen - (nla_type == NLA_NUL_STRING) }, |
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#include GENL_MAGIC_INCLUDE_FILE |
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#ifndef __KERNEL__ |
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#ifndef pr_info |
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#define pr_info(args...) fprintf(stderr, args); |
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#endif |
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#endif |
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#ifdef GENL_MAGIC_DEBUG |
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static void dprint_field(const char *dir, int nla_type, |
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const char *name, void *valp) |
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{ |
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__u64 val = valp ? *(__u32 *)valp : 1; |
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switch (nla_type) { |
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case NLA_U8: val = (__u8)val; |
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case NLA_U16: val = (__u16)val; |
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case NLA_U32: val = (__u32)val; |
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pr_info("%s attr %s: %d 0x%08x\n", dir, |
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name, (int)val, (unsigned)val); |
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break; |
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case NLA_U64: |
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val = *(__u64*)valp; |
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pr_info("%s attr %s: %lld 0x%08llx\n", dir, |
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name, (long long)val, (unsigned long long)val); |
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break; |
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case NLA_FLAG: |
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if (val) |
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pr_info("%s attr %s: set\n", dir, name); |
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break; |
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} |
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} |
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static void dprint_array(const char *dir, int nla_type, |
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const char *name, const char *val, unsigned len) |
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{ |
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switch (nla_type) { |
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case NLA_NUL_STRING: |
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if (len && val[len-1] == '\0') |
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len--; |
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pr_info("%s attr %s: [len:%u] '%s'\n", dir, name, len, val); |
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break; |
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default: |
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/* we can always show 4 byte, |
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* thats what nlattr are aligned to. */ |
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pr_info("%s attr %s: [len:%u] %02x%02x%02x%02x ...\n", |
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dir, name, len, val[0], val[1], val[2], val[3]); |
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} |
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} |
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#define DPRINT_TLA(a, op, b) pr_info("%s %s %s\n", a, op, b); |
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/* Name is a member field name of the struct s. |
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* If s is NULL (only parsing, no copy requested in *_from_attrs()), |
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* nla is supposed to point to the attribute containing the information |
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* corresponding to that struct member. */ |
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#define DPRINT_FIELD(dir, nla_type, name, s, nla) \ |
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do { \ |
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if (s) \ |
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dprint_field(dir, nla_type, #name, &s->name); \ |
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else if (nla) \ |
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dprint_field(dir, nla_type, #name, \ |
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(nla_type == NLA_FLAG) ? NULL \ |
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: nla_data(nla)); \ |
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} while (0) |
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#define DPRINT_ARRAY(dir, nla_type, name, s, nla) \ |
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do { \ |
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if (s) \ |
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dprint_array(dir, nla_type, #name, \ |
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s->name, s->name ## _len); \ |
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else if (nla) \ |
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dprint_array(dir, nla_type, #name, \ |
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nla_data(nla), nla_len(nla)); \ |
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} while (0) |
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#else |
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#define DPRINT_TLA(a, op, b) do {} while (0) |
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#define DPRINT_FIELD(dir, nla_type, name, s, nla) do {} while (0) |
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#define DPRINT_ARRAY(dir, nla_type, name, s, nla) do {} while (0) |
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#endif |
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/* |
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* Magic: provide conversion functions {{{1 |
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* populate struct from attribute table: |
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* {{{2 |
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*/ |
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/* processing of generic netlink messages is serialized. |
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* use one static buffer for parsing of nested attributes */ |
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static struct nlattr *nested_attr_tb[128]; |
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#ifndef BUILD_BUG_ON |
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/* Force a compilation error if condition is true */ |
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#define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition)) |
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/* Force a compilation error if condition is true, but also produce a |
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result (of value 0 and type size_t), so the expression can be used |
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e.g. in a structure initializer (or where-ever else comma expressions |
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aren't permitted). */ |
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#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) |
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#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) |
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#endif |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) \ |
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/* *_from_attrs functions are static, but potentially unused */ \ |
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static int __ ## s_name ## _from_attrs(struct s_name *s, \ |
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struct genl_info *info, bool exclude_invariants) \ |
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{ \ |
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const int maxtype = ARRAY_SIZE(s_name ## _nl_policy)-1; \ |
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struct nlattr *tla = info->attrs[tag_number]; \ |
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struct nlattr **ntb = nested_attr_tb; \ |
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struct nlattr *nla; \ |
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int err; \ |
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BUILD_BUG_ON(ARRAY_SIZE(s_name ## _nl_policy) > ARRAY_SIZE(nested_attr_tb)); \ |
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if (!tla) \ |
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return -ENOMSG; \ |
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DPRINT_TLA(#s_name, "<=-", #tag_name); \ |
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err = drbd_nla_parse_nested(ntb, maxtype, tla, s_name ## _nl_policy); \ |
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if (err) \ |
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return err; \ |
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\ |
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s_fields \ |
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return 0; \ |
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} __attribute__((unused)) \ |
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static int s_name ## _from_attrs(struct s_name *s, \ |
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struct genl_info *info) \ |
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{ \ |
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return __ ## s_name ## _from_attrs(s, info, false); \ |
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} __attribute__((unused)) \ |
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static int s_name ## _from_attrs_for_change(struct s_name *s, \ |
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struct genl_info *info) \ |
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{ \ |
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return __ ## s_name ## _from_attrs(s, info, true); \ |
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} __attribute__((unused)) \ |
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#define __assign(attr_nr, attr_flag, name, nla_type, type, assignment...) \ |
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nla = ntb[attr_nr]; \ |
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if (nla) { \ |
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if (exclude_invariants && !!((attr_flag) & DRBD_F_INVARIANT)) { \ |
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pr_info("<< must not change invariant attr: %s\n", #name); \ |
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return -EEXIST; \ |
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} \ |
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assignment; \ |
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} else if (exclude_invariants && !!((attr_flag) & DRBD_F_INVARIANT)) { \ |
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/* attribute missing from payload, */ \ |
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/* which was expected */ \ |
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} else if ((attr_flag) & DRBD_F_REQUIRED) { \ |
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pr_info("<< missing attr: %s\n", #name); \ |
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return -ENOMSG; \ |
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} |
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#undef __field |
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#define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \ |
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__is_signed) \ |
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__assign(attr_nr, attr_flag, name, nla_type, type, \ |
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if (s) \ |
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s->name = __get(nla); \ |
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DPRINT_FIELD("<<", nla_type, name, s, nla)) |
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/* validate_nla() already checked nla_len <= maxlen appropriately. */ |
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#undef __array |
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#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, \ |
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__get, __put, __is_signed) \ |
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__assign(attr_nr, attr_flag, name, nla_type, type, \ |
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if (s) \ |
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s->name ## _len = \ |
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__get(s->name, nla, maxlen); \ |
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DPRINT_ARRAY("<<", nla_type, name, s, nla)) |
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#include GENL_MAGIC_INCLUDE_FILE |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) |
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/* |
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* Magic: define op number to op name mapping {{{1 |
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* {{{2 |
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*/ |
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const char *CONCAT_(GENL_MAGIC_FAMILY, _genl_cmd_to_str)(__u8 cmd) |
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{ |
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switch (cmd) { |
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#undef GENL_op |
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#define GENL_op(op_name, op_num, handler, tla_list) \ |
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case op_num: return #op_name; |
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#include GENL_MAGIC_INCLUDE_FILE |
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default: |
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return "unknown"; |
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} |
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} |
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#ifdef __KERNEL__ |
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#include <linux/stringify.h> |
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/* |
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* Magic: define genl_ops {{{1 |
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* {{{2 |
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*/ |
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#undef GENL_op |
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#define GENL_op(op_name, op_num, handler, tla_list) \ |
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{ \ |
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handler \ |
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.cmd = op_name, \ |
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.policy = CONCAT_(GENL_MAGIC_FAMILY, _tla_nl_policy), \ |
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}, |
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#define ZZZ_genl_ops CONCAT_(GENL_MAGIC_FAMILY, _genl_ops) |
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static struct genl_ops ZZZ_genl_ops[] __read_mostly = { |
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#include GENL_MAGIC_INCLUDE_FILE |
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}; |
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#undef GENL_op |
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#define GENL_op(op_name, op_num, handler, tla_list) |
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/* |
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* Define the genl_family, multicast groups, {{{1 |
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* and provide register/unregister functions. |
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* {{{2 |
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*/ |
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#define ZZZ_genl_family CONCAT_(GENL_MAGIC_FAMILY, _genl_family) |
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static struct genl_family ZZZ_genl_family __read_mostly = { |
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.id = GENL_ID_GENERATE, |
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.name = __stringify(GENL_MAGIC_FAMILY), |
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.version = GENL_MAGIC_VERSION, |
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#ifdef GENL_MAGIC_FAMILY_HDRSZ |
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.hdrsize = NLA_ALIGN(GENL_MAGIC_FAMILY_HDRSZ), |
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#endif |
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.maxattr = ARRAY_SIZE(drbd_tla_nl_policy)-1, |
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}; |
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/* |
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* Magic: define multicast groups |
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* Magic: define multicast group registration helper |
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*/ |
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#define ZZZ_genl_mcgrps CONCAT_(GENL_MAGIC_FAMILY, _genl_mcgrps) |
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static const struct genl_multicast_group ZZZ_genl_mcgrps[] = { |
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#undef GENL_mc_group |
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#define GENL_mc_group(group) { .name = #group, }, |
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#include GENL_MAGIC_INCLUDE_FILE |
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}; |
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enum CONCAT_(GENL_MAGIC_FAMILY, group_ids) { |
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#undef GENL_mc_group |
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#define GENL_mc_group(group) CONCAT_(GENL_MAGIC_FAMILY, _group_ ## group), |
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#include GENL_MAGIC_INCLUDE_FILE |
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}; |
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#undef GENL_mc_group |
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#define GENL_mc_group(group) \ |
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static int CONCAT_(GENL_MAGIC_FAMILY, _genl_multicast_ ## group)( \ |
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struct sk_buff *skb, gfp_t flags) \ |
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{ \ |
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unsigned int group_id = \ |
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CONCAT_(GENL_MAGIC_FAMILY, _group_ ## group); \ |
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return genlmsg_multicast(&ZZZ_genl_family, skb, 0, \ |
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group_id, flags); \ |
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} |
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#include GENL_MAGIC_INCLUDE_FILE |
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#undef GENL_mc_group |
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#define GENL_mc_group(group) |
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int CONCAT_(GENL_MAGIC_FAMILY, _genl_register)(void) |
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{ |
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return genl_register_family_with_ops_groups(&ZZZ_genl_family, \ |
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ZZZ_genl_ops, \ |
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ZZZ_genl_mcgrps); |
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} |
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void CONCAT_(GENL_MAGIC_FAMILY, _genl_unregister)(void) |
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{ |
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genl_unregister_family(&ZZZ_genl_family); |
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} |
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/* |
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* Magic: provide conversion functions {{{1 |
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* populate skb from struct. |
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* {{{2 |
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*/ |
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#undef GENL_op |
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#define GENL_op(op_name, op_num, handler, tla_list) |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) \ |
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static int s_name ## _to_skb(struct sk_buff *skb, struct s_name *s, \ |
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const bool exclude_sensitive) \ |
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{ \ |
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struct nlattr *tla = nla_nest_start(skb, tag_number); \ |
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if (!tla) \ |
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goto nla_put_failure; \ |
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DPRINT_TLA(#s_name, "-=>", #tag_name); \ |
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s_fields \ |
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nla_nest_end(skb, tla); \ |
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return 0; \ |
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\ |
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nla_put_failure: \ |
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if (tla) \ |
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nla_nest_cancel(skb, tla); \ |
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return -EMSGSIZE; \ |
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} \ |
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static inline int s_name ## _to_priv_skb(struct sk_buff *skb, \ |
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struct s_name *s) \ |
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{ \ |
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return s_name ## _to_skb(skb, s, 0); \ |
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} \ |
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static inline int s_name ## _to_unpriv_skb(struct sk_buff *skb, \ |
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struct s_name *s) \ |
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{ \ |
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return s_name ## _to_skb(skb, s, 1); \ |
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} |
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#undef __field |
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#define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \ |
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__is_signed) \ |
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if (!exclude_sensitive || !((attr_flag) & DRBD_F_SENSITIVE)) { \ |
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DPRINT_FIELD(">>", nla_type, name, s, NULL); \ |
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if (__put(skb, attr_nr, s->name)) \ |
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goto nla_put_failure; \ |
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} |
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#undef __array |
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#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, \ |
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__get, __put, __is_signed) \ |
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if (!exclude_sensitive || !((attr_flag) & DRBD_F_SENSITIVE)) { \ |
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DPRINT_ARRAY(">>",nla_type, name, s, NULL); \ |
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if (__put(skb, attr_nr, min_t(int, maxlen, \ |
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s->name ## _len + (nla_type == NLA_NUL_STRING)),\ |
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s->name)) \ |
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goto nla_put_failure; \ |
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} |
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#include GENL_MAGIC_INCLUDE_FILE |
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/* Functions for initializing structs to default values. */ |
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#undef __field |
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#define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \ |
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__is_signed) |
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#undef __array |
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#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, \ |
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__get, __put, __is_signed) |
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#undef __u32_field_def |
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#define __u32_field_def(attr_nr, attr_flag, name, default) \ |
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x->name = default; |
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#undef __s32_field_def |
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#define __s32_field_def(attr_nr, attr_flag, name, default) \ |
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x->name = default; |
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#undef __flg_field_def |
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#define __flg_field_def(attr_nr, attr_flag, name, default) \ |
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x->name = default; |
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#undef __str_field_def |
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#define __str_field_def(attr_nr, attr_flag, name, maxlen) \ |
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memset(x->name, 0, sizeof(x->name)); \ |
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x->name ## _len = 0; |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) \ |
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static void set_ ## s_name ## _defaults(struct s_name *x) __attribute__((unused)); \ |
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static void set_ ## s_name ## _defaults(struct s_name *x) { \ |
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s_fields \ |
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} |
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#include GENL_MAGIC_INCLUDE_FILE |
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#endif /* __KERNEL__ */ |
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/* }}}1 */ |
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#endif /* GENL_MAGIC_FUNC_H */ |
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/* vim: set foldmethod=marker foldlevel=1 nofoldenable : */
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