3 // Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
4 // based on syscall.cc by Jacques Gelinas
6 // This program is free software; you can redistribute it and/or modify
7 // it under the terms of the GNU General Public License as published by
8 // the Free Software Foundation; either version 2, or (at your option)
11 // This program is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License
17 // along with this program; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 This tells the system call number for new_s_context and set_ipv4root
22 using /proc/self/status. This helps until the vserver project is
23 included officially in the kernel (and has its own syscall).
25 We rely on /proc/self/status to find the syscall number.
27 If it is not there, we rely on adm/unistd.h.
29 If this file does not have those system calls (not a patched kernel source)
30 we rely on static values in this file.
32 #include "safechroot-internal.hc"
38 #include <asm/unistd.h>
41 // Here is the trick. We keep a copy of the define, then undef it
42 // and then later, we try to locate the value reading /proc/self/status
43 // If this fails, we have the old preserved copy.
44 static int def_NR_set_ipv4root = 274;
45 #undef __NR_set_ipv4root
47 static int __NR_set_ipv4root_rev0;
48 static int __NR_set_ipv4root_rev1;
49 static int __NR_set_ipv4root_rev2;
50 static int __NR_set_ipv4root_rev3;
51 static int rev_ipv4root=0;
53 #ifdef ENSC_SYSCALL_TRADITIONAL
54 # if defined __dietlibc__
55 extern long int syscall (long int __sysno, ...);
59 set_ipv4root_rev0(unsigned long ip)
61 return syscall(__NR_set_ipv4root_rev0, ip);
65 set_ipv4root_rev1(unsigned long ip, unsigned long bcast)
67 return syscall(__NR_set_ipv4root_rev1, ip, bcast);
71 set_ipv4root_rev2(unsigned long *ip, int nb, unsigned long bcast)
73 return syscall(__NR_set_ipv4root_rev2, ip, nb, bcast);
77 set_ipv4root_rev3(unsigned long *ip, int nb, unsigned long bcast, unsigned long * mask)
79 return syscall(__NR_set_ipv4root_rev3, ip, nb, bcast, mask);
82 #else // ENSC_SYSCALL_TRADITIONAL
83 inline static _syscall1(int, set_ipv4root_rev0, unsigned long, ip)
84 inline static _syscall2(int, set_ipv4root_rev1, unsigned long, ip, unsigned long, bcast)
85 inline static _syscall3(int, set_ipv4root_rev2, unsigned long *, ip, int, nb, unsigned long, bcast)
86 inline static _syscall4(int, set_ipv4root_rev3, unsigned long *, ip, int, nb, unsigned long, bcast, unsigned long *, mask)
87 #endif // ENSC_SYSCALL_TRADITIONAL
89 static int def_NR_new_s_context = 273;
90 #undef __NR_new_s_context
91 static int __NR_new_s_context_rev0;
92 static int rev_s_context=0;
95 #ifdef ENSC_SYSCALL_TRADITIONAL
97 new_s_context_rev0(int newctx, int remove_cap, int flags)
99 return syscall(__NR_new_s_context_rev0, newctx, remove_cap, flags);
101 #else // ENSC_SYSCALL_TRADITIONAL
102 inline static _syscall3(int, new_s_context_rev0, int, newctx, int, remove_cap, int, flags)
103 #endif // ENSC_SYSCALL_TRADITIONAL
106 static bool is_init = false;
108 #include "utils-legacy.h"
111 # define WRITE_MSG(FD,X) (void)(write(FD,X,sizeof(X)-1))
116 getNumRevPair(char const *str, int *num, int *rev)
118 char const * blank_pos = strchr(str, ' ');
119 char const * eol_pos = strchr(str, '\n');
122 if (*num==0) return false;
124 if (blank_pos!=0 && eol_pos!=0 && blank_pos<eol_pos &&
125 strncmp(blank_pos+1, "rev", 3)==0)
126 *rev = atoi(blank_pos+4);
131 #define SET_TAG_POS(TAG) \
132 pos = strstr(buf, (TAG)); \
133 if (pos) pos+=sizeof(TAG)-1
135 static bool init_internal()
137 size_t bufsize = utilvserver_getProcEntryBufsize();
139 char const * pos = 0;
140 pid_t pid = getpid();
145 pos=utilvserver_getProcEntry(pid, 0, buf, bufsize);
146 if (pos==0 && errno==EAGAIN) return false;
148 SET_TAG_POS("\n__NR_set_ipv4root: ");
149 if ( pos!=0 && getNumRevPair(pos, &num, &rev_ipv4root) ) {
150 __NR_set_ipv4root_rev0 =
151 __NR_set_ipv4root_rev1 =
152 __NR_set_ipv4root_rev2 =
153 __NR_set_ipv4root_rev3 = num;
156 SET_TAG_POS("\n__NR_new_s_context: ");
157 if ( pos!=0 && getNumRevPair(pos, &num, &rev_s_context) )
158 __NR_new_s_context_rev0 = num;
168 __NR_set_ipv4root_rev0 = def_NR_set_ipv4root;
169 __NR_set_ipv4root_rev1 = def_NR_set_ipv4root;
170 __NR_set_ipv4root_rev2 = def_NR_set_ipv4root;
171 __NR_set_ipv4root_rev3 = def_NR_set_ipv4root;
172 __NR_new_s_context_rev0 = def_NR_new_s_context;
174 while (!init_internal() && errno==EAGAIN) {}
180 void vc_init_legacy()
185 void vc_init_internal_legacy(int ctx_rev, int ctx_number,
186 int ipv4_rev, int ipv4_number)
188 rev_s_context = ctx_rev;
189 __NR_new_s_context_rev0 = ctx_number;
191 rev_ipv4root = ipv4_rev;
192 __NR_set_ipv4root_rev0 = ipv4_number;
193 __NR_set_ipv4root_rev1 = ipv4_number;
194 __NR_set_ipv4root_rev2 = ipv4_number;
195 __NR_set_ipv4root_rev3 = ipv4_number;
200 static ALWAYSINLINE xid_t
201 vc_new_s_context_legacy(int ctx, int remove_cap, int flags)
205 if (rev_s_context == 0){
206 return new_s_context_rev0(ctx, remove_cap, flags);
214 static ALWAYSINLINE int
215 vc_set_ipv4root_legacy_internal (
219 unsigned long mask[])
222 if (rev_ipv4root == 0){
224 WRITE_MSG(2,"set_ipv4root: Several IP number specified, but this kernel only supports one. Ignored\n");
226 return set_ipv4root_rev0 (ip[0]);
227 }else if (rev_ipv4root == 1){
229 WRITE_MSG(2,"set_ipv4root: Several IP number specified, but this kernel only supports one. Ignored\n");
231 return set_ipv4root_rev1 (ip[0],bcast);
232 }else if (rev_ipv4root == 2){
233 return set_ipv4root_rev2 (ip,nb,bcast);
234 }else if (rev_ipv4root == 3){
235 return set_ipv4root_rev3 (ip,nb,bcast,mask);
241 static ALWAYSINLINE int
242 vc_set_ipv4root_legacy(uint32_t bcast, size_t nb, struct vc_ip_mask_pair const *ips)
244 unsigned long ip[nb];
245 unsigned long mask[nb];
248 for (i=0; i<nb; ++i) {
250 mask[i] = ips[i].mask;
253 return vc_set_ipv4root_legacy_internal(ip, nb, bcast, mask);