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// SPDX-License-Identifier: GPL-2.0-or-later
/* Declarations and definitions for kernel interaction over netlink
* Copyright (C) 2016 Cumulus Networks, Inc.
*/
#ifndef _ZEBRA_KERNEL_NETLINK_H
#define _ZEBRA_KERNEL_NETLINK_H
#ifdef __cplusplus
extern "C" {
#endif
#ifdef HAVE_NETLINK
#define RTM_NHA(h) \
((struct rtattr *)(((char *)(h)) + NLMSG_ALIGN(sizeof(struct nhmsg))))
#define NL_RCV_PKT_BUF_SIZE (34 * 1024)
#define NL_PKT_BUF_SIZE 8192
/*
* nl_attr_put - add an attribute to the Netlink message.
*
* Returns true if the attribute could be added to the message (fits into the
* buffer), otherwise false is returned.
*/
extern bool nl_attr_put(struct nlmsghdr *n, unsigned int maxlen, int type,
const void *data, unsigned int alen);
extern bool nl_attr_put8(struct nlmsghdr *n, unsigned int maxlen, int type,
uint8_t data);
extern bool nl_attr_put16(struct nlmsghdr *n, unsigned int maxlen, int type,
uint16_t data);
extern bool nl_attr_put32(struct nlmsghdr *n, unsigned int maxlen, int type,
uint32_t data);
extern bool nl_attr_put64(struct nlmsghdr *n, unsigned int maxlen, int type,
uint64_t data);
/*
* nl_attr_nest - start an attribute nest.
*
* Returns a valid pointer to the beginning of the nest if the attribute
* describing the nest could be added to the message (fits into the buffer),
* otherwise NULL is returned.
*/
extern struct rtattr *nl_attr_nest(struct nlmsghdr *n, unsigned int maxlen,
int type);
/*
* nl_attr_nest_end - finalize nesting of attributes.
*
* Updates the length field of the attribute header to include the appeneded
* attributes. Returns a total length of the Netlink message.
*/
extern int nl_attr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
/*
* nl_attr_rtnh - append a rtnexthop record to the Netlink message.
*
* Returns a valid pointer to the rtnexthop struct if it could be added to
* the message (fits into the buffer), otherwise NULL is returned.
*/
extern struct rtnexthop *nl_attr_rtnh(struct nlmsghdr *n, unsigned int maxlen);
/*
* nl_attr_rtnh_end - finalize adding a rtnexthop record.
*
* Updates the length field of the rtnexthop to include the appeneded
* attributes.
*/
extern void nl_attr_rtnh_end(struct nlmsghdr *n, struct rtnexthop *rtnh);
extern void netlink_parse_rtattr(struct rtattr **tb, int max,
struct rtattr *rta, int len);
extern void netlink_parse_rtattr_flags(struct rtattr **tb, int max,
struct rtattr *rta, int len,
unsigned short flags);
extern void netlink_parse_rtattr_nested(struct rtattr **tb, int max,
struct rtattr *rta);
/*
* nl_addraw_l copies raw form the netlink message buffer into netlink
* message header pointer. It ensures the aligned data buffer does not
* override past max length.
* return value is 0 if its successful
*/
extern bool nl_addraw_l(struct nlmsghdr *n, unsigned int maxlen,
const void *data, unsigned int len);
extern const char *nl_msg_type_to_str(uint16_t msg_type);
extern const char *nl_rtproto_to_str(uint8_t rtproto);
extern const char *nl_family_to_str(uint8_t family);
extern const char *nl_rttype_to_str(uint8_t rttype);
extern int netlink_parse_info(int (*filter)(struct nlmsghdr *, ns_id_t, int),
struct nlsock *nl,
const struct zebra_dplane_info *dp_info,
int count, bool startup);
extern int netlink_talk_filter(struct nlmsghdr *h, ns_id_t ns, int startup);
extern int netlink_talk(int (*filter)(struct nlmsghdr *, ns_id_t, int startup),
struct nlmsghdr *n, struct nlsock *nl,
struct zebra_ns *zns, bool startup);
extern int netlink_request(struct nlsock *nl, void *req);
enum netlink_msg_status {
FRR_NETLINK_SUCCESS,
FRR_NETLINK_ERROR,
FRR_NETLINK_QUEUED,
};
struct nl_batch;
/*
* netlink_batch_add_msg - add message to the netlink batch using dplane
* context object.
*
* @ctx: Dataplane context
* @msg_encoder: A function that encodes dplane context object into
* netlink message. Should take dplane context object,
* pointer to a buffer and buffer's length as parameters
* and should return -1 on error, 0 on buffer overflow or
* size of the encoded message.
* @ignore_res: Whether the result of this message should be ignored.
* This should be used in some 'update' cases where we
* need to send two messages for one context object.
*
* Return: Status of the message.
*/
extern enum netlink_msg_status netlink_batch_add_msg(
struct nl_batch *bth, struct zebra_dplane_ctx *ctx,
ssize_t (*msg_encoder)(struct zebra_dplane_ctx *, void *, size_t),
bool ignore_res);
/*
* Vty/cli apis
*/
extern int netlink_config_write_helper(struct vty *vty);
/*
* Configure size of the batch buffer and sending threshold. If 'unset', reset
* to default value.
*/
extern void netlink_set_batch_buffer_size(uint32_t size, uint32_t threshold,
bool set);
extern struct nlsock *kernel_netlink_nlsock_lookup(int sock);
#endif /* HAVE_NETLINK */
#ifdef __cplusplus
}
#endif
#endif /* _ZEBRA_KERNEL_NETLINK_H */
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