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"
39 #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 #if defined(__pic__) && defined(__i386)
55 set_ipv4root_rev0(unsigned long ip)
57 return syscall(__NR_set_ipv4root_rev0, ip);
61 set_ipv4root_rev1(unsigned long ip, unsigned long bcast)
63 return syscall(__NR_set_ipv4root_rev1, ip, bcast);
67 set_ipv4root_rev2(unsigned long *ip, int nb, unsigned long bcast)
69 return syscall(__NR_set_ipv4root_rev2, ip, nb, bcast);
73 set_ipv4root_rev3(unsigned long *ip, int nb, unsigned long bcast, unsigned long * mask)
75 return syscall(__NR_set_ipv4root_rev3, ip, nb, bcast, mask);
79 inline static _syscall1(int, set_ipv4root_rev0, unsigned long, ip)
80 inline static _syscall2(int, set_ipv4root_rev1, unsigned long, ip, unsigned long, bcast)
81 inline static _syscall3(int, set_ipv4root_rev2, unsigned long *, ip, int, nb, unsigned long, bcast)
82 inline static _syscall4(int, set_ipv4root_rev3, unsigned long *, ip, int, nb, unsigned long, bcast, unsigned long *, mask)
85 static int def_NR_new_s_context = 273;
86 #undef __NR_new_s_context
87 static int __NR_new_s_context_rev0;
88 //static int __NR_new_s_context_rev1;
89 static int rev_s_context=0;
91 #if defined(__pic__) && defined(__i386)
93 new_s_context_rev0(int newctx, int remove_cap, int flags)
95 return syscall(__NR_new_s_context_rev0, newctx, remove_cap, flags);
98 inline static _syscall3(int, new_s_context_rev0, int, newctx, int, remove_cap, int, flags)
99 //static _syscall4(int, new_s_context_rev1, int, nbctx, int *, ctxs, int, remove_cap, int, flags)
103 #undef __NR_set_ctxlimit
104 static int __NR_set_ctxlimit=-1;
105 static int rev_set_ctxlimit=-1;
107 static _syscall2 (int, set_ctxlimit, int, resource, long, limit)
112 static int is_init = 0;
114 FILE *fin = fopen ("/proc/self/status","r");
115 __NR_set_ipv4root_rev0 = def_NR_set_ipv4root;
116 __NR_set_ipv4root_rev1 = def_NR_set_ipv4root;
117 __NR_set_ipv4root_rev2 = def_NR_set_ipv4root;
118 __NR_set_ipv4root_rev3 = def_NR_set_ipv4root;
119 __NR_new_s_context_rev0 = def_NR_new_s_context;
120 //__NR_new_s_context_rev1 = def_NR_new_s_context;
123 while (fgets(line,sizeof(line)-1,fin)!=NULL){
125 char title[100],rev[100];
127 if (sscanf(line,"%s %d %s",title,&num,rev)>=2){
128 if (strcmp(title,"__NR_set_ipv4root:")==0){
129 __NR_set_ipv4root_rev0 = num;
130 __NR_set_ipv4root_rev1 = num;
131 __NR_set_ipv4root_rev2 = num;
132 __NR_set_ipv4root_rev3 = num;
133 if (strncmp(rev,"rev",3)==0){
134 rev_ipv4root = atoi(rev+3);
137 }else if (strcmp(title,"__NR_set_ctxlimit:")==0){
138 __NR_set_ctxlimit = num;
139 if (strncmp(rev,"rev",3)==0){
140 rev_set_ctxlimit = atoi(rev+3);
143 }else if (strcmp(title,"__NR_new_s_context:")==0){
144 __NR_new_s_context_rev0 = num;
145 //__NR_new_s_context_rev1 = num;
146 if (strncmp(rev,"rev",3)==0){
147 rev_s_context = atoi(rev+3);
158 void vc_init_legacy()
163 static ALWAYSINLINE int
164 vc_new_s_context_legacy(int ctx, int remove_cap, int flags)
168 if (rev_s_context == 0){
169 return new_s_context_rev0(ctx, remove_cap, flags);
177 static ALWAYSINLINE int
178 vc_set_ipv4root_legacy_internal (
182 unsigned long mask[])
185 if (rev_ipv4root == 0){
187 fprintf (stderr,"set_ipv4root: Several IP number specified, but this kernel only supports one. Ignored\n");
189 return set_ipv4root_rev0 (ip[0]);
190 }else if (rev_ipv4root == 1){
192 fprintf (stderr,"set_ipv4root: Several IP number specified, but this kernel only supports one. Ignored\n");
194 return set_ipv4root_rev1 (ip[0],bcast);
195 }else if (rev_ipv4root == 2){
196 return set_ipv4root_rev2 (ip,nb,bcast);
197 }else if (rev_ipv4root == 3){
198 return set_ipv4root_rev3 (ip,nb,bcast,mask);
204 static ALWAYSINLINE int
205 vc_set_ipv4root_legacy(uint32_t bcast, size_t nb, struct vc_ip_mask_pair const *ips)
207 unsigned long ip[nb];
208 unsigned long mask[nb];
211 for (i=0; i<nb; ++i) {
213 mask[i] = ips[i].mask;
216 return vc_set_ipv4root_legacy_internal(ip, nb, bcast, mask);