1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2021 Ng Peng Nam Sean 5 * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 #ifndef _NETLINK_NETLINK_VAR_H_ 29 #define _NETLINK_NETLINK_VAR_H_ 30 31 #ifdef _KERNEL 32 33 #include <sys/ck.h> 34 #include <sys/epoch.h> 35 #include <sys/sysctl.h> 36 #include <sys/taskqueue.h> 37 #include <net/vnet.h> 38 39 #define NLSNDQ 65536 /* Default socket sendspace */ 40 #define NLRCVQ 65536 /* Default socket recvspace */ 41 42 #define NLMBUFSIZE 2048 /* External storage size for Netlink mbufs */ 43 44 struct ucred; 45 46 struct nl_buf { 47 TAILQ_ENTRY(nl_buf) tailq; 48 u_int buflen; 49 u_int datalen; 50 u_int offset; 51 char data[]; 52 }; 53 54 #define NLP_MAX_GROUPS 128 55 56 BITSET_DEFINE(nl_groups, NLP_MAX_GROUPS); 57 struct nlpcb { 58 struct socket *nl_socket; 59 struct nl_groups nl_groups; 60 uint32_t nl_port; 61 uint32_t nl_flags; 62 uint32_t nl_process_id; 63 int nl_proto; 64 bool nl_bound; 65 bool nl_task_pending; 66 bool nl_tx_blocked; /* No new requests accepted */ 67 bool nl_linux; /* true if running under compat */ 68 bool nl_unconstrained_vnet; /* true if running under VNET jail (or without jail) */ 69 bool nl_need_thread_setup; 70 struct taskqueue *nl_taskqueue; 71 struct task nl_task; 72 struct ucred *nl_cred; /* Copy of nl_socket->so_cred */ 73 uint64_t nl_dropped_bytes; 74 uint64_t nl_dropped_messages; 75 CK_LIST_ENTRY(nlpcb) nl_next; 76 CK_LIST_ENTRY(nlpcb) nl_port_next; 77 volatile u_int nl_refcount; 78 struct mtx nl_lock; 79 struct epoch_context nl_epoch_ctx; 80 }; 81 #define sotonlpcb(so) ((struct nlpcb *)(so)->so_pcb) 82 83 #define NLP_LOCK_INIT(_nlp) mtx_init(&((_nlp)->nl_lock), "nlp mtx", NULL, MTX_DEF) 84 #define NLP_LOCK_DESTROY(_nlp) mtx_destroy(&((_nlp)->nl_lock)) 85 #define NLP_LOCK(_nlp) mtx_lock(&((_nlp)->nl_lock)) 86 #define NLP_UNLOCK(_nlp) mtx_unlock(&((_nlp)->nl_lock)) 87 88 #define ALIGNED_NL_SZ(_data) roundup2((((struct nlmsghdr *)(_data))->nlmsg_len), 16) 89 90 /* nl_flags */ 91 #define NLF_CAP_ACK 0x01 /* Do not send message body with errmsg */ 92 #define NLF_EXT_ACK 0x02 /* Allow including extended TLVs in ack */ 93 #define NLF_STRICT 0x04 /* Perform strict header checks */ 94 #define NLF_MSG_INFO 0x08 /* Send caller info along with the notifications */ 95 96 SYSCTL_DECL(_net_netlink); 97 SYSCTL_DECL(_net_netlink_debug); 98 99 struct nl_control { 100 CK_LIST_HEAD(nl_pid_head, nlpcb) ctl_port_head; 101 CK_LIST_HEAD(nlpcb_head, nlpcb) ctl_pcb_head; 102 CK_LIST_ENTRY(nl_control) ctl_next; 103 struct rmlock ctl_lock; 104 }; 105 VNET_DECLARE(struct nl_control *, nl_ctl); 106 #define V_nl_ctl VNET(nl_ctl) 107 108 109 struct sockaddr_nl; 110 struct sockaddr; 111 struct nlmsghdr; 112 113 /* netlink_module.c */ 114 struct nl_control *vnet_nl_ctl_init(void); 115 116 int nl_verify_proto(int proto); 117 const char *nl_get_proto_name(int proto); 118 119 extern int netlink_unloading; 120 121 struct nl_proto_handler { 122 nl_handler_f cb; 123 const char *proto_name; 124 }; 125 extern struct nl_proto_handler *nl_handlers; 126 127 /* netlink_domain.c */ 128 bool nl_send_group(struct nl_writer *); 129 void nl_osd_register(void); 130 void nl_osd_unregister(void); 131 void nl_set_thread_nlp(struct thread *td, struct nlpcb *nlp); 132 133 /* netlink_io.c */ 134 bool nl_send(struct nl_writer *, struct nlpcb *); 135 void nlmsg_ack(struct nlpcb *nlp, int error, struct nlmsghdr *nlmsg, 136 struct nl_pstate *npt); 137 void nl_on_transmit(struct nlpcb *nlp); 138 139 void nl_taskqueue_handler(void *_arg, int pending); 140 void nl_schedule_taskqueue(struct nlpcb *nlp); 141 void nl_process_receive_locked(struct nlpcb *nlp); 142 void nl_set_source_metadata(struct mbuf *m, int num_messages); 143 struct nl_buf *nl_buf_alloc(size_t len, int mflag); 144 void nl_buf_free(struct nl_buf *nb); 145 146 /* netlink_generic.c */ 147 struct genl_family { 148 const char *family_name; 149 uint16_t family_hdrsize; 150 uint16_t family_id; 151 uint16_t family_version; 152 uint16_t family_attr_max; 153 uint16_t family_cmd_size; 154 uint16_t family_num_groups; 155 struct genl_cmd *family_cmds; 156 }; 157 158 struct genl_group { 159 struct genl_family *group_family; 160 const char *group_name; 161 }; 162 163 struct genl_family *genl_get_family(uint16_t family_id); 164 struct genl_group *genl_get_group(uint32_t group_id); 165 166 #define MAX_FAMILIES 20 167 #define MAX_GROUPS 64 168 169 #define MIN_GROUP_NUM 48 170 171 #define CTRL_FAMILY_NAME "nlctrl" 172 173 struct ifnet; 174 struct nl_parsed_link; 175 struct nlattr_bmask; 176 struct nl_pstate; 177 178 /* Function map */ 179 struct nl_function_wrapper { 180 bool (*nlmsg_add)(struct nl_writer *nw, uint32_t portid, uint32_t seq, uint16_t type, 181 uint16_t flags, uint32_t len); 182 bool (*nlmsg_refill_buffer)(struct nl_writer *nw, size_t required_len); 183 bool (*nlmsg_flush)(struct nl_writer *nw); 184 bool (*nlmsg_end)(struct nl_writer *nw); 185 void (*nlmsg_abort)(struct nl_writer *nw); 186 void (*nlmsg_ignore_limit)(struct nl_writer *nw); 187 bool (*nl_writer_unicast)(struct nl_writer *nw, size_t size, 188 struct nlpcb *nlp, bool waitok); 189 bool (*nl_writer_group)(struct nl_writer *nw, size_t size, 190 uint16_t protocol, uint16_t group_id, bool waitok); 191 bool (*nlmsg_end_dump)(struct nl_writer *nw, int error, struct nlmsghdr *hdr); 192 int (*nl_modify_ifp_generic)(struct ifnet *ifp, struct nl_parsed_link *lattrs, 193 const struct nlattr_bmask *bm, struct nl_pstate *npt); 194 void (*nl_store_ifp_cookie)(struct nl_pstate *npt, struct ifnet *ifp); 195 struct nlpcb * (*nl_get_thread_nlp)(struct thread *td); 196 }; 197 void nl_set_functions(const struct nl_function_wrapper *nl); 198 199 200 201 #endif 202 #endif 203