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d07dcf9aad
Add, and use in generic netlink, helpers to dump out a netlink policy to userspace, including all the range validation data, nested policies etc. This lets userspace discover what the kernel understands. For families/commands other than generic netlink, the helpers need to be used directly in an appropriate command, or we can add some infrastructure (a new netlink family) that those can register their policies with for introspection. I'm not that familiar with non-generic netlink, so that's left out for now. The data exposed to userspace also includes min and max length for binary/string data, I've done that instead of letting the userspace tools figure out whether min/max is intended based on the type so that we can extend this later in the kernel, we might want to just use the range data for example. Because of this, I opted to not directly expose the NLA_* values, even if some of them are already exposed via BPF, as with min/max length we don't need to have different types here for NLA_BINARY/NLA_MIN_LEN/NLA_EXACT_LEN, we just make them all NL_ATTR_TYPE_BINARY with min/max length optionally set. Similarly, we don't really need NLA_MSECS, and perhaps can remove it in the future - but not if we encode it into the userspace API now. It gets mapped to NL_ATTR_TYPE_U64 here. Note that the exposing here corresponds to the strict policy interpretation, and NLA_UNSPEC items are omitted entirely. To get those, change them to NLA_MIN_LEN which behaves in exactly the same way, but is exposed. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI__LINUX_GENERIC_NETLINK_H
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#define _UAPI__LINUX_GENERIC_NETLINK_H
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#include <linux/types.h>
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#include <linux/netlink.h>
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#define GENL_NAMSIZ 16 /* length of family name */
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#define GENL_MIN_ID NLMSG_MIN_TYPE
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#define GENL_MAX_ID 1023
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struct genlmsghdr {
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__u8 cmd;
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__u8 version;
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__u16 reserved;
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};
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#define GENL_HDRLEN NLMSG_ALIGN(sizeof(struct genlmsghdr))
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#define GENL_ADMIN_PERM 0x01
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#define GENL_CMD_CAP_DO 0x02
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#define GENL_CMD_CAP_DUMP 0x04
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#define GENL_CMD_CAP_HASPOL 0x08
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#define GENL_UNS_ADMIN_PERM 0x10
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/*
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* List of reserved static generic netlink identifiers:
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*/
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#define GENL_ID_CTRL NLMSG_MIN_TYPE
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#define GENL_ID_VFS_DQUOT (NLMSG_MIN_TYPE + 1)
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#define GENL_ID_PMCRAID (NLMSG_MIN_TYPE + 2)
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/* must be last reserved + 1 */
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#define GENL_START_ALLOC (NLMSG_MIN_TYPE + 3)
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/**************************************************************************
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* Controller
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**************************************************************************/
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enum {
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CTRL_CMD_UNSPEC,
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CTRL_CMD_NEWFAMILY,
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CTRL_CMD_DELFAMILY,
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CTRL_CMD_GETFAMILY,
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CTRL_CMD_NEWOPS,
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CTRL_CMD_DELOPS,
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CTRL_CMD_GETOPS,
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CTRL_CMD_NEWMCAST_GRP,
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CTRL_CMD_DELMCAST_GRP,
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CTRL_CMD_GETMCAST_GRP, /* unused */
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CTRL_CMD_GETPOLICY,
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__CTRL_CMD_MAX,
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};
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#define CTRL_CMD_MAX (__CTRL_CMD_MAX - 1)
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enum {
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CTRL_ATTR_UNSPEC,
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CTRL_ATTR_FAMILY_ID,
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CTRL_ATTR_FAMILY_NAME,
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CTRL_ATTR_VERSION,
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CTRL_ATTR_HDRSIZE,
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CTRL_ATTR_MAXATTR,
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CTRL_ATTR_OPS,
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CTRL_ATTR_MCAST_GROUPS,
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CTRL_ATTR_POLICY,
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__CTRL_ATTR_MAX,
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};
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#define CTRL_ATTR_MAX (__CTRL_ATTR_MAX - 1)
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enum {
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CTRL_ATTR_OP_UNSPEC,
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CTRL_ATTR_OP_ID,
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CTRL_ATTR_OP_FLAGS,
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__CTRL_ATTR_OP_MAX,
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};
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#define CTRL_ATTR_OP_MAX (__CTRL_ATTR_OP_MAX - 1)
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enum {
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CTRL_ATTR_MCAST_GRP_UNSPEC,
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CTRL_ATTR_MCAST_GRP_NAME,
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CTRL_ATTR_MCAST_GRP_ID,
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__CTRL_ATTR_MCAST_GRP_MAX,
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};
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#define CTRL_ATTR_MCAST_GRP_MAX (__CTRL_ATTR_MCAST_GRP_MAX - 1)
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#endif /* _UAPI__LINUX_GENERIC_NETLINK_H */
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