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b9e03e2636
Adjust parsing and rendering appropriately to make sub-messages work.
Rendering is pretty trivial, as the submsg -> netlink conversion looks
like rendering a nest in which only one attr was set. Only trick
is that we use the enum value of the sub-message rather than the nest
as the type, and effectively skip one layer of nesting. A real double
nested struct would look like this:
[SELECTOR]
[SUBMSG]
[NEST]
[MSG1-ATTR]
A submsg "is" the nest so by skipping I mean:
[SELECTOR]
[SUBMSG]
[MSG1-ATTR]
There is no extra validation in YNL if caller has set the selector
matching the submsg type (e.g. link type = "macvlan" but the nest
attrs are set to carry "veth"). Let the kernel handle that.
Parsing side is a little more specialized as we need to render and
insert a new kind of function which switches between what to parse
based on the selector. But code isn't too complicated.
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://patch.msgid.link/20250515231650.1325372-7-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
143 lines
3.5 KiB
C
143 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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#ifndef __YNL_C_H
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#define __YNL_C_H 1
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#include <stdbool.h>
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#include <stddef.h>
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#include <linux/genetlink.h>
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#include <linux/types.h>
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#include "ynl-priv.h"
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enum ynl_error_code {
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YNL_ERROR_NONE = 0,
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__YNL_ERRNO_END = 4096,
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YNL_ERROR_INTERNAL,
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YNL_ERROR_DUMP_INTER,
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YNL_ERROR_EXPECT_ACK,
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YNL_ERROR_EXPECT_MSG,
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YNL_ERROR_UNEXPECT_MSG,
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YNL_ERROR_ATTR_MISSING,
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YNL_ERROR_ATTR_INVALID,
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YNL_ERROR_UNKNOWN_NTF,
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YNL_ERROR_INV_RESP,
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YNL_ERROR_INPUT_INVALID,
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YNL_ERROR_INPUT_TOO_BIG,
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YNL_ERROR_SUBMSG_KEY,
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};
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/**
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* struct ynl_error - error encountered by YNL
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* @code: errno (low values) or YNL error code (enum ynl_error_code)
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* @attr_offs: offset of bad attribute (for very advanced users)
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* @msg: error message
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*
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* Error information for when YNL operations fail.
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* Users should interact with the err member of struct ynl_sock directly.
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* The main exception to that rule is ynl_sock_create().
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*/
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struct ynl_error {
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enum ynl_error_code code;
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unsigned int attr_offs;
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char msg[512];
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};
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/**
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* struct ynl_family - YNL family info
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* Family description generated by codegen. Pass to ynl_sock_create().
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*/
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struct ynl_family {
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/* private: */
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const char *name;
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size_t hdr_len;
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bool is_classic;
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__u16 classic_id;
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const struct ynl_ntf_info *ntf_info;
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unsigned int ntf_info_size;
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};
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/**
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* struct ynl_sock - YNL wrapped netlink socket
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* @err: YNL error descriptor, cleared on every request.
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*/
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struct ynl_sock {
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struct ynl_error err;
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/* private: */
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const struct ynl_family *family;
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int socket;
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__u32 seq;
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__u32 portid;
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__u16 family_id;
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unsigned int n_mcast_groups;
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struct {
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unsigned int id;
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char name[GENL_NAMSIZ];
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} *mcast_groups;
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struct ynl_ntf_base_type *ntf_first;
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struct ynl_ntf_base_type **ntf_last_next;
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struct nlmsghdr *nlh;
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const struct ynl_policy_nest *req_policy;
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size_t req_hdr_len;
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unsigned char *tx_buf;
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unsigned char *rx_buf;
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unsigned char raw_buf[];
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};
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/**
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* struct ynl_string - parsed individual string
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* @len: length of the string (excluding terminating character)
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* @str: value of the string
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*
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* Parsed and nul-terminated string. This struct is only used for arrays of
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* strings. Non-array string members are placed directly in respective types.
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*/
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struct ynl_string {
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unsigned int len;
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char str[];
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};
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struct ynl_sock *
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ynl_sock_create(const struct ynl_family *yf, struct ynl_error *e);
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void ynl_sock_destroy(struct ynl_sock *ys);
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#define ynl_dump_foreach(dump, iter) \
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for (typeof(dump->obj) *iter = &dump->obj; \
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!ynl_dump_obj_is_last(iter); \
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iter = ynl_dump_obj_next(iter))
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/**
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* ynl_dump_empty() - does the dump have no entries
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* @dump: pointer to the dump list, as returned by a dump call
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*
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* Check if the dump is empty, i.e. contains no objects.
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* Dump calls return NULL on error, and terminator element if empty.
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*/
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static inline bool ynl_dump_empty(void *dump)
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{
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return dump == (void *)YNL_LIST_END;
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}
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int ynl_subscribe(struct ynl_sock *ys, const char *grp_name);
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int ynl_socket_get_fd(struct ynl_sock *ys);
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int ynl_ntf_check(struct ynl_sock *ys);
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/**
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* ynl_has_ntf() - check if socket has *parsed* notifications
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* @ys: active YNL socket
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*
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* Note that this does not take into account notifications sitting
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* in netlink socket, just the notifications which have already been
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* read and parsed (e.g. during a ynl_ntf_check() call).
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*/
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static inline bool ynl_has_ntf(struct ynl_sock *ys)
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{
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return ys->ntf_last_next != &ys->ntf_first;
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}
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struct ynl_ntf_base_type *ynl_ntf_dequeue(struct ynl_sock *ys);
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void ynl_ntf_free(struct ynl_ntf_base_type *ntf);
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#endif
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