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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2021 Ng Peng Nam Sean
* Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _NETLINK_NETLINK_VAR_H_
#define _NETLINK_NETLINK_VAR_H_
#ifdef _KERNEL
#include <sys/ck.h>
#include <sys/epoch.h>
#include <sys/sysctl.h>
#include <sys/taskqueue.h>
#include <net/vnet.h>
#define NLSNDQ 65536 /* Default socket sendspace */
#define NLRCVQ 65536 /* Default socket recvspace */
#define NLMBUFSIZE 2048 /* External storage size for Netlink mbufs */
struct ucred;
struct nl_buf {
TAILQ_ENTRY(nl_buf) tailq;
struct mbuf *control;
u_int buflen;
u_int datalen;
u_int offset;
char data[];
};
#define NLP_MAX_GROUPS 128
struct nlpcb {
struct socket *nl_socket;
uint64_t nl_groups[NLP_MAX_GROUPS / 64];
uint32_t nl_port;
uint32_t nl_flags;
uint32_t nl_process_id;
int nl_proto;
bool nl_bound;
bool nl_task_pending;
bool nl_tx_blocked; /* No new requests accepted */
bool nl_linux; /* true if running under compat */
bool nl_unconstrained_vnet; /* true if running under VNET jail (or without jail) */
bool nl_need_thread_setup;
struct taskqueue *nl_taskqueue;
struct task nl_task;
struct ucred *nl_cred; /* Copy of nl_socket->so_cred */
uint64_t nl_dropped_bytes;
uint64_t nl_dropped_messages;
CK_LIST_ENTRY(nlpcb) nl_next;
CK_LIST_ENTRY(nlpcb) nl_port_next;
volatile u_int nl_refcount;
struct mtx nl_lock;
struct epoch_context nl_epoch_ctx;
};
#define sotonlpcb(so) ((struct nlpcb *)(so)->so_pcb)
#define NLP_LOCK_INIT(_nlp) mtx_init(&((_nlp)->nl_lock), "nlp mtx", NULL, MTX_DEF)
#define NLP_LOCK_DESTROY(_nlp) mtx_destroy(&((_nlp)->nl_lock))
#define NLP_LOCK(_nlp) mtx_lock(&((_nlp)->nl_lock))
#define NLP_UNLOCK(_nlp) mtx_unlock(&((_nlp)->nl_lock))
#define ALIGNED_NL_SZ(_data) roundup2((((struct nlmsghdr *)(_data))->nlmsg_len), 16)
/* nl_flags */
#define NLF_CAP_ACK 0x01 /* Do not send message body with errmsg */
#define NLF_EXT_ACK 0x02 /* Allow including extended TLVs in ack */
#define NLF_STRICT 0x04 /* Perform strict header checks */
#define NLF_MSG_INFO 0x08 /* Send caller info along with the notifications */
SYSCTL_DECL(_net_netlink);
SYSCTL_DECL(_net_netlink_debug);
struct nl_control {
CK_LIST_HEAD(nl_pid_head, nlpcb) ctl_port_head;
CK_LIST_HEAD(nlpcb_head, nlpcb) ctl_pcb_head;
CK_LIST_ENTRY(nl_control) ctl_next;
struct rmlock ctl_lock;
};
VNET_DECLARE(struct nl_control *, nl_ctl);
#define V_nl_ctl VNET(nl_ctl)
struct sockaddr_nl;
struct sockaddr;
struct nlmsghdr;
/* netlink_module.c */
struct nl_control *vnet_nl_ctl_init(void);
int nl_verify_proto(int proto);
const char *nl_get_proto_name(int proto);
extern int netlink_unloading;
struct nl_proto_handler {
nl_handler_f cb;
const char *proto_name;
};
extern struct nl_proto_handler *nl_handlers;
/* netlink_domain.c */
bool nl_send_group(struct nl_writer *);
void nl_osd_register(void);
void nl_osd_unregister(void);
void nl_set_thread_nlp(struct thread *td, struct nlpcb *nlp);
/* netlink_io.c */
#define NL_IOF_UNTRANSLATED 0x01
#define NL_IOF_IGNORE_LIMIT 0x02
bool nl_send_one(struct nl_writer *);
void nlmsg_ack(struct nlpcb *nlp, int error, struct nlmsghdr *nlmsg,
struct nl_pstate *npt);
void nl_on_transmit(struct nlpcb *nlp);
void nl_taskqueue_handler(void *_arg, int pending);
void nl_schedule_taskqueue(struct nlpcb *nlp);
void nl_process_receive_locked(struct nlpcb *nlp);
void nl_set_source_metadata(struct mbuf *m, int num_messages);
void nl_add_msg_info(struct nl_buf *nb);
struct nl_buf *nl_buf_alloc(size_t len, int mflag);
void nl_buf_free(struct nl_buf *nb);
/* netlink_generic.c */
struct genl_family {
const char *family_name;
uint16_t family_hdrsize;
uint16_t family_id;
uint16_t family_version;
uint16_t family_attr_max;
uint16_t family_cmd_size;
uint16_t family_num_groups;
struct genl_cmd *family_cmds;
};
struct genl_group {
struct genl_family *group_family;
const char *group_name;
};
struct genl_family *genl_get_family(uint32_t family_id);
struct genl_group *genl_get_group(uint32_t group_id);
#define MAX_FAMILIES 20
#define MAX_GROUPS 64
#define MIN_GROUP_NUM 48
#define CTRL_FAMILY_NAME "nlctrl"
struct ifnet;
struct nl_parsed_link;
struct nlattr_bmask;
struct nl_pstate;
/* Function map */
struct nl_function_wrapper {
bool (*nlmsg_add)(struct nl_writer *nw, uint32_t portid, uint32_t seq, uint16_t type,
uint16_t flags, uint32_t len);
bool (*nlmsg_refill_buffer)(struct nl_writer *nw, int required_len);
bool (*nlmsg_flush)(struct nl_writer *nw);
bool (*nlmsg_end)(struct nl_writer *nw);
void (*nlmsg_abort)(struct nl_writer *nw);
void (*nlmsg_ignore_limit)(struct nl_writer *nw);
bool (*nlmsg_get_unicast_writer)(struct nl_writer *nw, int size, struct nlpcb *nlp);
bool (*nlmsg_get_group_writer)(struct nl_writer *nw, int size, int protocol, int group_id);
bool (*nlmsg_get_chain_writer)(struct nl_writer *nw, int size, struct mbuf **pm);
bool (*nlmsg_end_dump)(struct nl_writer *nw, int error, struct nlmsghdr *hdr);
int (*nl_modify_ifp_generic)(struct ifnet *ifp, struct nl_parsed_link *lattrs,
const struct nlattr_bmask *bm, struct nl_pstate *npt);
void (*nl_store_ifp_cookie)(struct nl_pstate *npt, struct ifnet *ifp);
struct nlpcb * (*nl_get_thread_nlp)(struct thread *td);
};
void nl_set_functions(const struct nl_function_wrapper *nl);
#endif
#endif

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