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*/
38static int
39compat_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
162release_exit:
163	if_release(ifp, &psref);
164	curlwp_bindx(bound);
165	return error;
166}
167
168void
169uipc_syscalls_40_init(void)
170{
171
172	MODULE_SET_HOOK(uipc_syscalls_40_hook, "uipc40", compat_ifconf);
173}
174
175void
176uipc_syscalls_40_fini(void)
177{
178
179	MODULE_UNSET_HOOK(uipc_syscalls_40_hook);
180}
181