uipc_syscalls_40.c revision 1.16 1 /* $NetBSD: uipc_syscalls_40.c,v 1.16 2018/04/12 18:50:13 christos 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 1.16 2018/04/12 18:50:13 christos Exp $");
7
8 /*
9 * System call interface to the socket abstraction.
10 */
11
12 #include <sys/param.h>
13 #include <sys/kernel.h>
14 #include <sys/msg.h>
15 #include <sys/sysctl.h>
16 #include <sys/syscallargs.h>
17 #include <sys/errno.h>
18
19 #include <net/if.h>
20
21 #include <compat/sys/socket.h>
22 #include <compat/sys/sockio.h>
23
24 /*
25 * Return interface configuration
26 * of system. List may be used
27 * in later ioctl's (above) to get
28 * other information.
29 */
30 /*ARGSUSED*/
31 static int
32 compat_ifconf(struct lwp *l, u_long cmd, void *data)
33 {
34 struct oifconf *ifc = data;
35 struct ifnet *ifp;
36 struct oifreq ifr, *ifrp = NULL;
37 int space = 0, error = 0;
38 const int sz = (int)sizeof(ifr);
39 const bool docopy = ifc->ifc_req != NULL;
40 int s;
41 int bound;
42 struct psref psref;
43
44 switch (cmd) {
45 case OSIOCGIFCONF:
46 case OOSIOCGIFCONF:
47 break;
48 default:
49 return ENOSYS;
50 }
51
52 if (docopy) {
53 space = ifc->ifc_len;
54 ifrp = ifc->ifc_req;
55 }
56
57 bound = curlwp_bind();
58 s = pserialize_read_enter();
59 IFNET_READER_FOREACH(ifp) {
60 struct ifaddr *ifa;
61
62 if_acquire(ifp, &psref);
63 pserialize_read_exit(s);
64
65 (void)strncpy(ifr.ifr_name, ifp->if_xname,
66 sizeof(ifr.ifr_name));
67 if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0') {
68 error = ENAMETOOLONG;
69 goto release_exit;
70 }
71 if (IFADDR_READER_EMPTY(ifp)) {
72 memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
73 if (space >= sz) {
74 error = copyout(&ifr, ifrp, sz);
75 if (error != 0)
76 goto release_exit;
77 ifrp++;
78 }
79 space -= sizeof(ifr);
80 goto next;
81 }
82
83 s = pserialize_read_enter();
84 IFADDR_READER_FOREACH(ifa, ifp) {
85 struct sockaddr *sa = ifa->ifa_addr;
86 struct psref psref_ifa;
87
88 ifa_acquire(ifa, &psref_ifa);
89 pserialize_read_exit(s);
90 #ifdef COMPAT_OSOCK
91 if (cmd == OOSIOCGIFCONF) {
92 struct osockaddr *osa =
93 (struct osockaddr *)&ifr.ifr_addr;
94 /*
95 * If it does not fit, we don't bother with it
96 */
97 if (sa->sa_len > sizeof(*osa))
98 goto next_ifa;
99 memcpy(&ifr.ifr_addr, sa, sa->sa_len);
100 osa->sa_family = sa->sa_family;
101 if (space >= sz) {
102 error = copyout(&ifr, ifrp, sz);
103 ifrp++;
104 }
105 } else
106 #endif
107 if (sa->sa_len <= sizeof(*sa)) {
108 memcpy(&ifr.ifr_addr, sa, sa->sa_len);
109 if (space >= sz) {
110 error = copyout(&ifr, ifrp, sz);
111 ifrp++;
112 }
113 } else {
114 space -= sa->sa_len - sizeof(*sa);
115 if (space >= sz) {
116 error = copyout(&ifr, ifrp,
117 sizeof(ifr.ifr_name));
118 if (error == 0) {
119 error = copyout(sa,
120 &ifrp->ifr_addr,
121 sa->sa_len);
122 }
123 ifrp = (struct oifreq *)
124 (sa->sa_len +
125 (char *)&ifrp->ifr_addr);
126 }
127 }
128 if (error != 0) {
129 ifa_release(ifa, &psref_ifa);
130 goto release_exit;
131 }
132 space -= sz;
133
134 #ifdef COMPAT_OSOCK
135 next_ifa:
136 #endif
137 s = pserialize_read_enter();
138 ifa_release(ifa, &psref_ifa);
139 }
140 pserialize_read_exit(s);
141
142 next:
143 s = pserialize_read_enter();
144 if_release(ifp, &psref);
145 }
146 pserialize_read_exit(s);
147 curlwp_bindx(bound);
148
149 if (docopy)
150 ifc->ifc_len -= space;
151 else
152 ifc->ifc_len = -space;
153 return (0);
154
155 release_exit:
156 if_release(ifp, &psref);
157 curlwp_bindx(bound);
158 return error;
159 }
160
161 void
162 uipc_syscalls_40_init(void)
163 {
164 vec_compat_ifconf = compat_ifconf;
165 }
166
167 void
168 uipc_syscalls_40_fini(void)
169 {
170 vec_compat_ifconf = (void *)enosys;
171 }
172