uipc_syscalls_40.c revision 1.17 1 /* $NetBSD: uipc_syscalls_40.c,v 1.17 2019/01/27 02:08:39 pgoyette Exp $ */
2
3 /* written by Pavel Cahyna, 2006. Public domain. */
4
5 #include <sys/cdefs.h>
6 __KERNEL_RCSID(0, "$NetBSD: uipc_syscalls_40.c,v 1.17 2019/01/27 02:08:39 pgoyette Exp $");
7
8 #if defined(_KERNEL_OPT)
9 #include "opt_compat_netbsd.h"
10 #endif
11
12 /*
13 * System call interface to the socket abstraction.
14 */
15
16 #include <sys/param.h>
17 #include <sys/kernel.h>
18 #include <sys/msg.h>
19 #include <sys/sysctl.h>
20 #include <sys/syscallargs.h>
21 #include <sys/errno.h>
22 #include <sys/compat_stub.h>
23
24 #include <net/if.h>
25
26 #include <compat/sys/socket.h>
27 #include <compat/sys/sockio.h>
28
29 #include <compat/common/compat_mod.h>
30
31 /*
32 * Return interface configuration
33 * of system. List may be used
34 * in later ioctl's (above) to get
35 * other information.
36 */
37 /*ARGSUSED*/
38 static int
39 compat_ifconf(u_long cmd, void *data)
40 {
41 struct oifconf *ifc = data;
42 struct ifnet *ifp;
43 struct oifreq ifr, *ifrp = NULL;
44 int space = 0, error = 0;
45 const int sz = (int)sizeof(ifr);
46 const bool docopy = ifc->ifc_req != NULL;
47 int s;
48 int bound;
49 struct psref psref;
50
51 switch (cmd) {
52 case OSIOCGIFCONF:
53 case OOSIOCGIFCONF:
54 break;
55 default:
56 return ENOSYS;
57 }
58
59 if (docopy) {
60 space = ifc->ifc_len;
61 ifrp = ifc->ifc_req;
62 }
63
64 bound = curlwp_bind();
65 s = pserialize_read_enter();
66 IFNET_READER_FOREACH(ifp) {
67 struct ifaddr *ifa;
68
69 if_acquire(ifp, &psref);
70 pserialize_read_exit(s);
71
72 (void)strncpy(ifr.ifr_name, ifp->if_xname,
73 sizeof(ifr.ifr_name));
74 if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0') {
75 error = ENAMETOOLONG;
76 goto release_exit;
77 }
78 if (IFADDR_READER_EMPTY(ifp)) {
79 memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
80 if (space >= sz) {
81 error = copyout(&ifr, ifrp, sz);
82 if (error != 0)
83 goto release_exit;
84 ifrp++;
85 }
86 space -= sizeof(ifr);
87 goto next;
88 }
89
90 s = pserialize_read_enter();
91 IFADDR_READER_FOREACH(ifa, ifp) {
92 struct sockaddr *sa = ifa->ifa_addr;
93 struct psref psref_ifa;
94
95 ifa_acquire(ifa, &psref_ifa);
96 pserialize_read_exit(s);
97 #ifdef COMPAT_OSOCK
98 if (cmd == OOSIOCGIFCONF) {
99 struct osockaddr *osa =
100 (struct osockaddr *)&ifr.ifr_addr;
101 /*
102 * If it does not fit, we don't bother with it
103 */
104 if (sa->sa_len > sizeof(*osa))
105 goto next_ifa;
106 memcpy(&ifr.ifr_addr, sa, sa->sa_len);
107 osa->sa_family = sa->sa_family;
108 if (space >= sz) {
109 error = copyout(&ifr, ifrp, sz);
110 ifrp++;
111 }
112 } else
113 #endif
114 if (sa->sa_len <= sizeof(*sa)) {
115 memcpy(&ifr.ifr_addr, sa, sa->sa_len);
116 if (space >= sz) {
117 error = copyout(&ifr, ifrp, sz);
118 ifrp++;
119 }
120 } else {
121 space -= sa->sa_len - sizeof(*sa);
122 if (space >= sz) {
123 error = copyout(&ifr, ifrp,
124 sizeof(ifr.ifr_name));
125 if (error == 0) {
126 error = copyout(sa,
127 &ifrp->ifr_addr,
128 sa->sa_len);
129 }
130 ifrp = (struct oifreq *)
131 (sa->sa_len +
132 (char *)&ifrp->ifr_addr);
133 }
134 }
135 if (error != 0) {
136 ifa_release(ifa, &psref_ifa);
137 goto release_exit;
138 }
139 space -= sz;
140
141 #ifdef COMPAT_OSOCK
142 next_ifa:
143 #endif
144 s = pserialize_read_enter();
145 ifa_release(ifa, &psref_ifa);
146 }
147 pserialize_read_exit(s);
148
149 next:
150 s = pserialize_read_enter();
151 if_release(ifp, &psref);
152 }
153 pserialize_read_exit(s);
154 curlwp_bindx(bound);
155
156 if (docopy)
157 ifc->ifc_len -= space;
158 else
159 ifc->ifc_len = -space;
160 return (0);
161
162 release_exit:
163 if_release(ifp, &psref);
164 curlwp_bindx(bound);
165 return error;
166 }
167
168 void
169 uipc_syscalls_40_init(void)
170 {
171
172 MODULE_SET_HOOK(uipc_syscalls_40_hook, "uipc40", compat_ifconf);
173 }
174
175 void
176 uipc_syscalls_40_fini(void)
177 {
178
179 MODULE_UNSET_HOOK(uipc_syscalls_40_hook);
180 }
181