bsd/kern/socket_info.c

   1 /*
   2  * Copyright (c) 2005-2020 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #include <sys/types.h>
  30 #include <sys/kernel_types.h>
  31 #include <sys/errno.h>
  32 #include <sys/kernel.h>
  33 #include <sys/file_internal.h>
  34 #include <sys/stat.h>
  35 #include <sys/select.h>
  36 #include <sys/pipe.h>
  37 #include <sys/proc_info.h>
  38 #include <sys/domain.h>
  39 #include <sys/protosw.h>
  40 #include <sys/domain.h>
  41 #include <sys/socketvar.h>
  42 #include <sys/unpcb.h>
  43 #include <sys/sys_domain.h>
  44 #include <sys/kern_event.h>
  45 #include <sys/vsock_domain.h>
  46 #include <mach/vm_param.h>
  47 #include <net/ndrv_var.h>
  48 #include <netinet/in_pcb.h>
  49 #include <netinet/tcp_var.h>
  50 #include <string.h>
  51
  52 static void fill_sockbuf_info(struct sockbuf *sb, struct sockbuf_info *sbi);
  53 static void fill_common_sockinfo(struct socket *so, struct socket_info *si);
  54
  55 static void
  56 fill_sockbuf_info(struct sockbuf *sb, struct sockbuf_info *sbi)
  57 {
  58         sbi->sbi_cc = sb->sb_cc;
  59         sbi->sbi_hiwat = sb->sb_hiwat;
  60         sbi->sbi_mbcnt = sb->sb_mbcnt;
  61         sbi->sbi_mbmax = sb->sb_mbmax;
  62         sbi->sbi_lowat = sb->sb_lowat;
  63         sbi->sbi_flags = (short)sb->sb_flags;
  64         sbi->sbi_timeo = (short)((sb->sb_timeo.tv_sec * hz) +
  65             sb->sb_timeo.tv_usec / tick);
  66         if (sbi->sbi_timeo == 0 && sb->sb_timeo.tv_usec != 0) {
  67                 sbi->sbi_timeo = 1;
  68         }
  69 }
  70
  71 static void
  72 fill_common_sockinfo(struct socket *so, struct socket_info *si)
  73 {
  74         si->soi_so = (u_int64_t)VM_KERNEL_ADDRPERM(so);
  75         si->soi_type = so->so_type;
  76         si->soi_options = (short)(so->so_options & 0xffff);
  77         si->soi_linger = so->so_linger;
  78         si->soi_state = so->so_state;
  79         si->soi_pcb = (u_int64_t)VM_KERNEL_ADDRPERM(so->so_pcb);
  80         if (so->so_proto) {
  81                 si->soi_protocol = SOCK_PROTO(so);
  82                 if (so->so_proto->pr_domain) {
  83                         si->soi_family = SOCK_DOM(so);
  84                 } else {
  85                         si->soi_family = 0;
  86                 }
  87         } else {
  88                 si->soi_protocol = si->soi_family = 0;
  89         }
  90         si->soi_qlen = so->so_qlen;
  91         si->soi_incqlen = so->so_incqlen;
  92         si->soi_qlimit = so->so_qlimit;
  93         si->soi_timeo = so->so_timeo;
  94         si->soi_error = so->so_error;
  95         si->soi_oobmark = so->so_oobmark;
  96         fill_sockbuf_info(&so->so_snd, &si->soi_snd);
  97         fill_sockbuf_info(&so->so_rcv, &si->soi_rcv);
  98 }
  99
 100 errno_t
 101 fill_socketinfo(struct socket *so, struct socket_info *si)
 102 {
 103         errno_t error = 0;
 104         int domain;
 105         short type;
 106         short protocol;
 107
 108         socket_lock(so, 0);
 109
 110         si->soi_kind = SOCKINFO_GENERIC;
 111
 112         fill_common_sockinfo(so, si);
 113
 114         if (so->so_pcb == NULL || so->so_proto == 0 ||
 115             so->so_proto->pr_domain == NULL) {
 116                 goto out;
 117         }
 118
 119         /*
 120          * The kind of socket is determined by the triplet
 121          * {domain, type, protocol}
 122          */
 123         domain = SOCK_DOM(so);
 124         type = SOCK_TYPE(so);
 125         protocol = SOCK_PROTO(so);
 126         switch (domain) {
 127         case PF_INET:
 128         case PF_INET6: {
 129                 struct in_sockinfo *insi = &si->soi_proto.pri_in;
 130                 struct inpcb *inp = (struct inpcb *)so->so_pcb;
 131
 132                 si->soi_kind = SOCKINFO_IN;
 133
 134                 insi->insi_fport = inp->inp_fport;
 135                 insi->insi_lport = inp->inp_lport;
 136                 insi->insi_gencnt = inp->inp_gencnt;
 137                 insi->insi_flags = inp->inp_flags;
 138                 insi->insi_vflag = inp->inp_vflag;
 139                 insi->insi_ip_ttl = inp->inp_ip_ttl;
 140                 insi->insi_faddr.ina_6 = inp->inp_dependfaddr.inp6_foreign;
 141                 insi->insi_laddr.ina_6 = inp->inp_dependladdr.inp6_local;
 142                 insi->insi_v4.in4_tos = inp->inp_depend4.inp4_ip_tos;
 143                 insi->insi_v6.in6_hlim = 0;
 144                 insi->insi_v6.in6_cksum = inp->inp_depend6.inp6_cksum;
 145                 insi->insi_v6.in6_ifindex = 0;
 146                 insi->insi_v6.in6_hops = inp->inp_depend6.inp6_hops;
 147
 148                 if (type == SOCK_STREAM && (protocol == 0 ||
 149                     protocol == IPPROTO_TCP) && inp->inp_ppcb != NULL) {
 150                         struct tcp_sockinfo *tcpsi = &si->soi_proto.pri_tcp;
 151                         struct tcpcb *tp = (struct tcpcb *)inp->inp_ppcb;
 152
 153                         si->soi_kind = SOCKINFO_TCP;
 154
 155                         tcpsi->tcpsi_state = tp->t_state;
 156                         tcpsi->tcpsi_timer[TSI_T_REXMT] =
 157                             tp->t_timer[TCPT_REXMT];
 158                         tcpsi->tcpsi_timer[TSI_T_PERSIST] =
 159                             tp->t_timer[TCPT_PERSIST];
 160                         tcpsi->tcpsi_timer[TSI_T_KEEP] =
 161                             tp->t_timer[TCPT_KEEP];
 162                         tcpsi->tcpsi_timer[TSI_T_2MSL] =
 163                             tp->t_timer[TCPT_2MSL];
 164                         tcpsi->tcpsi_mss = tp->t_maxseg;
 165                         tcpsi->tcpsi_flags = tp->t_flags;
 166                         tcpsi->tcpsi_tp =
 167                             (u_int64_t)VM_KERNEL_ADDRPERM(tp);
 168                 }
 169                 break;
 170         }
 171         case PF_UNIX: {
 172                 struct unpcb *unp = (struct unpcb *)so->so_pcb;
 173                 struct un_sockinfo *unsi = &si->soi_proto.pri_un;
 174
 175                 si->soi_kind = SOCKINFO_UN;
 176
 177                 unsi->unsi_conn_pcb =
 178                     (uint64_t)VM_KERNEL_ADDRPERM(unp->unp_conn);
 179                 if (unp->unp_conn) {
 180                         unsi->unsi_conn_so = (uint64_t)
 181                             VM_KERNEL_ADDRPERM(unp->unp_conn->unp_socket);
 182                 }
 183
 184                 if (unp->unp_addr) {
 185                         size_t  addrlen = unp->unp_addr->sun_len;
 186
 187                         if (addrlen > SOCK_MAXADDRLEN) {
 188                                 addrlen = SOCK_MAXADDRLEN;
 189                         }
 190                         bcopy(unp->unp_addr, &unsi->unsi_addr, addrlen);
 191                 }
 192                 if (unp->unp_conn && unp->unp_conn->unp_addr) {
 193                         size_t  addrlen = unp->unp_conn->unp_addr->sun_len;
 194
 195                         if (addrlen > SOCK_MAXADDRLEN) {
 196                                 addrlen = SOCK_MAXADDRLEN;
 197                         }
 198                         bcopy(unp->unp_conn->unp_addr, &unsi->unsi_caddr,
 199                             addrlen);
 200                 }
 201                 break;
 202         }
 203         case PF_NDRV: {
 204                 struct ndrv_cb *ndrv_cb = (struct ndrv_cb *)so->so_pcb;
 205                 struct ndrv_info *ndrvsi = &si->soi_proto.pri_ndrv;
 206
 207                 si->soi_kind = SOCKINFO_NDRV;
 208
 209                 /* TDB lock ifnet ???? */
 210                 if (ndrv_cb->nd_if != 0) {
 211                         struct ifnet *ifp = ndrv_cb->nd_if;
 212
 213                         ndrvsi->ndrvsi_if_family = ifp->if_family;
 214                         ndrvsi->ndrvsi_if_unit = ifp->if_unit;
 215                         strlcpy(ndrvsi->ndrvsi_if_name, ifp->if_name, IFNAMSIZ);
 216                 }
 217                 break;
 218         }
 219         case PF_VSOCK: {
 220                 const struct vsockpcb *pcb = (struct vsockpcb *)(so)->so_pcb;
 221                 struct vsock_sockinfo *vsocksi = &si->soi_proto.pri_vsock;
 222
 223                 si->soi_kind = SOCKINFO_VSOCK;
 224
 225                 vsocksi->local_cid = pcb->local_address.cid;
 226                 vsocksi->local_port = pcb->local_address.port;
 227                 vsocksi->remote_cid = pcb->remote_address.cid;
 228                 vsocksi->remote_port = pcb->remote_address.port;
 229
 230                 break;
 231         }
 232         case PF_SYSTEM:
 233                 if (SOCK_PROTO(so) == SYSPROTO_EVENT) {
 234                         struct kern_event_pcb *ev_pcb =
 235                             (struct kern_event_pcb *)so->so_pcb;
 236                         struct kern_event_info *kesi =
 237                             &si->soi_proto.pri_kern_event;
 238
 239                         si->soi_kind = SOCKINFO_KERN_EVENT;
 240
 241                         kesi->kesi_vendor_code_filter =
 242                             ev_pcb->evp_vendor_code_filter;
 243                         kesi->kesi_class_filter = ev_pcb->evp_class_filter;
 244                         kesi->kesi_subclass_filter = ev_pcb->evp_subclass_filter;
 245                 } else if (SOCK_PROTO(so) == SYSPROTO_CONTROL) {
 246                         kctl_fill_socketinfo(so, si);
 247                 }
 248                 break;
 249
 250         case PF_ROUTE:
 251         case PF_PPP:
 252         default:
 253                 break;
 254         }
 255 out:
 256         socket_unlock(so, 0);
 257
 258         return error;
 259 }