mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-09 04:36:31 +00:00
09fa78d438
Refactoring of argument list to nl_send_one() led to derefercing
wrong union member. Rename nl_send_one() to a more generic name,
isolate anew nl_send_one() as the callback only for the normal
writer and provide correct argument to nl_send() from nl_send_group().
Fixes: ff5ad900d2
201 lines
6.5 KiB
C
201 lines
6.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Ng Peng Nam Sean
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* Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _NETLINK_NETLINK_VAR_H_
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#define _NETLINK_NETLINK_VAR_H_
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#ifdef _KERNEL
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#include <sys/ck.h>
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#include <sys/epoch.h>
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#include <sys/sysctl.h>
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#include <sys/taskqueue.h>
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#include <net/vnet.h>
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#define NLSNDQ 65536 /* Default socket sendspace */
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#define NLRCVQ 65536 /* Default socket recvspace */
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#define NLMBUFSIZE 2048 /* External storage size for Netlink mbufs */
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struct ucred;
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struct nl_buf {
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TAILQ_ENTRY(nl_buf) tailq;
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u_int buflen;
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u_int datalen;
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u_int offset;
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char data[];
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};
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#define NLP_MAX_GROUPS 128
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struct nlpcb {
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struct socket *nl_socket;
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uint64_t nl_groups[NLP_MAX_GROUPS / 64];
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uint32_t nl_port;
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uint32_t nl_flags;
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uint32_t nl_process_id;
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int nl_proto;
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bool nl_bound;
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bool nl_task_pending;
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bool nl_tx_blocked; /* No new requests accepted */
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bool nl_linux; /* true if running under compat */
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bool nl_unconstrained_vnet; /* true if running under VNET jail (or without jail) */
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bool nl_need_thread_setup;
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struct taskqueue *nl_taskqueue;
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struct task nl_task;
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struct ucred *nl_cred; /* Copy of nl_socket->so_cred */
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uint64_t nl_dropped_bytes;
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uint64_t nl_dropped_messages;
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CK_LIST_ENTRY(nlpcb) nl_next;
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CK_LIST_ENTRY(nlpcb) nl_port_next;
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volatile u_int nl_refcount;
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struct mtx nl_lock;
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struct epoch_context nl_epoch_ctx;
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};
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#define sotonlpcb(so) ((struct nlpcb *)(so)->so_pcb)
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#define NLP_LOCK_INIT(_nlp) mtx_init(&((_nlp)->nl_lock), "nlp mtx", NULL, MTX_DEF)
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#define NLP_LOCK_DESTROY(_nlp) mtx_destroy(&((_nlp)->nl_lock))
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#define NLP_LOCK(_nlp) mtx_lock(&((_nlp)->nl_lock))
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#define NLP_UNLOCK(_nlp) mtx_unlock(&((_nlp)->nl_lock))
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#define ALIGNED_NL_SZ(_data) roundup2((((struct nlmsghdr *)(_data))->nlmsg_len), 16)
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/* nl_flags */
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#define NLF_CAP_ACK 0x01 /* Do not send message body with errmsg */
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#define NLF_EXT_ACK 0x02 /* Allow including extended TLVs in ack */
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#define NLF_STRICT 0x04 /* Perform strict header checks */
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#define NLF_MSG_INFO 0x08 /* Send caller info along with the notifications */
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SYSCTL_DECL(_net_netlink);
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SYSCTL_DECL(_net_netlink_debug);
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struct nl_control {
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CK_LIST_HEAD(nl_pid_head, nlpcb) ctl_port_head;
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CK_LIST_HEAD(nlpcb_head, nlpcb) ctl_pcb_head;
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CK_LIST_ENTRY(nl_control) ctl_next;
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struct rmlock ctl_lock;
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};
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VNET_DECLARE(struct nl_control *, nl_ctl);
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#define V_nl_ctl VNET(nl_ctl)
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struct sockaddr_nl;
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struct sockaddr;
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struct nlmsghdr;
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/* netlink_module.c */
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struct nl_control *vnet_nl_ctl_init(void);
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int nl_verify_proto(int proto);
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const char *nl_get_proto_name(int proto);
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extern int netlink_unloading;
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struct nl_proto_handler {
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nl_handler_f cb;
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const char *proto_name;
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};
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extern struct nl_proto_handler *nl_handlers;
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/* netlink_domain.c */
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bool nl_send_group(struct nl_writer *);
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void nl_osd_register(void);
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void nl_osd_unregister(void);
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void nl_set_thread_nlp(struct thread *td, struct nlpcb *nlp);
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/* netlink_io.c */
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bool nl_send(struct nl_writer *, struct nlpcb *);
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void nlmsg_ack(struct nlpcb *nlp, int error, struct nlmsghdr *nlmsg,
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struct nl_pstate *npt);
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void nl_on_transmit(struct nlpcb *nlp);
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void nl_taskqueue_handler(void *_arg, int pending);
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void nl_schedule_taskqueue(struct nlpcb *nlp);
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void nl_process_receive_locked(struct nlpcb *nlp);
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void nl_set_source_metadata(struct mbuf *m, int num_messages);
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struct nl_buf *nl_buf_alloc(size_t len, int mflag);
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void nl_buf_free(struct nl_buf *nb);
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/* netlink_generic.c */
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struct genl_family {
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const char *family_name;
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uint16_t family_hdrsize;
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uint16_t family_id;
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uint16_t family_version;
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uint16_t family_attr_max;
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uint16_t family_cmd_size;
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uint16_t family_num_groups;
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struct genl_cmd *family_cmds;
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};
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struct genl_group {
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struct genl_family *group_family;
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const char *group_name;
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};
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struct genl_family *genl_get_family(uint32_t family_id);
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struct genl_group *genl_get_group(uint32_t group_id);
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#define MAX_FAMILIES 20
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#define MAX_GROUPS 64
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#define MIN_GROUP_NUM 48
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#define CTRL_FAMILY_NAME "nlctrl"
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struct ifnet;
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struct nl_parsed_link;
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struct nlattr_bmask;
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struct nl_pstate;
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/* Function map */
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struct nl_function_wrapper {
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bool (*nlmsg_add)(struct nl_writer *nw, uint32_t portid, uint32_t seq, uint16_t type,
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uint16_t flags, uint32_t len);
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bool (*nlmsg_refill_buffer)(struct nl_writer *nw, int required_len);
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bool (*nlmsg_flush)(struct nl_writer *nw);
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bool (*nlmsg_end)(struct nl_writer *nw);
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void (*nlmsg_abort)(struct nl_writer *nw);
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void (*nlmsg_ignore_limit)(struct nl_writer *nw);
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bool (*nlmsg_get_unicast_writer)(struct nl_writer *nw, int size, struct nlpcb *nlp);
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bool (*nlmsg_get_group_writer)(struct nl_writer *nw, int size, int protocol, int group_id);
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bool (*nlmsg_get_chain_writer)(struct nl_writer *nw, int size, struct mbuf **pm);
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bool (*nlmsg_end_dump)(struct nl_writer *nw, int error, struct nlmsghdr *hdr);
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int (*nl_modify_ifp_generic)(struct ifnet *ifp, struct nl_parsed_link *lattrs,
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const struct nlattr_bmask *bm, struct nl_pstate *npt);
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void (*nl_store_ifp_cookie)(struct nl_pstate *npt, struct ifnet *ifp);
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struct nlpcb * (*nl_get_thread_nlp)(struct thread *td);
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};
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void nl_set_functions(const struct nl_function_wrapper *nl);
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#endif
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#endif
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