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1 | 7b93fadf | Corey Bryant | /*
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2 | 7b93fadf | Corey Bryant | * QEMU Bridge Helper
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3 | 7b93fadf | Corey Bryant | *
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4 | 7b93fadf | Corey Bryant | * Copyright IBM, Corp. 2011
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5 | 7b93fadf | Corey Bryant | *
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6 | 7b93fadf | Corey Bryant | * Authors:
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7 | 7b93fadf | Corey Bryant | * Anthony Liguori <aliguori@us.ibm.com>
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8 | 7b93fadf | Corey Bryant | * Richa Marwaha <rmarwah@linux.vnet.ibm.com>
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9 | 7b93fadf | Corey Bryant | * Corey Bryant <coreyb@linux.vnet.ibm.com>
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10 | 7b93fadf | Corey Bryant | *
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11 | 7b93fadf | Corey Bryant | * This work is licensed under the terms of the GNU GPL, version 2. See
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12 | 7b93fadf | Corey Bryant | * the COPYING file in the top-level directory.
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13 | 7b93fadf | Corey Bryant | *
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14 | 7b93fadf | Corey Bryant | */
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15 | 7b93fadf | Corey Bryant | |
16 | 7b93fadf | Corey Bryant | #include "config-host.h" |
17 | 7b93fadf | Corey Bryant | |
18 | 7b93fadf | Corey Bryant | #include <stdio.h> |
19 | 7b93fadf | Corey Bryant | #include <errno.h> |
20 | 7b93fadf | Corey Bryant | #include <fcntl.h> |
21 | 7b93fadf | Corey Bryant | #include <unistd.h> |
22 | 7b93fadf | Corey Bryant | #include <string.h> |
23 | 7b93fadf | Corey Bryant | #include <stdlib.h> |
24 | 7b93fadf | Corey Bryant | #include <stdbool.h> |
25 | 7b93fadf | Corey Bryant | #include <ctype.h> |
26 | bdef79a2 | Corey Bryant | #include <glib.h> |
27 | 7b93fadf | Corey Bryant | |
28 | 7b93fadf | Corey Bryant | #include <sys/types.h> |
29 | 7b93fadf | Corey Bryant | #include <sys/ioctl.h> |
30 | 7b93fadf | Corey Bryant | #include <sys/socket.h> |
31 | 7b93fadf | Corey Bryant | #include <sys/un.h> |
32 | 7b93fadf | Corey Bryant | #include <sys/prctl.h> |
33 | 7b93fadf | Corey Bryant | |
34 | 7b93fadf | Corey Bryant | #include <net/if.h> |
35 | 7b93fadf | Corey Bryant | |
36 | 7b93fadf | Corey Bryant | #include <linux/sockios.h> |
37 | 7b93fadf | Corey Bryant | |
38 | 34309d2b | Corey Bryant | #ifndef SIOCBRADDIF
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39 | 34309d2b | Corey Bryant | #include <linux/if_bridge.h> |
40 | 34309d2b | Corey Bryant | #endif
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41 | 34309d2b | Corey Bryant | |
42 | 1de7afc9 | Paolo Bonzini | #include "qemu/queue.h" |
43 | bdef79a2 | Corey Bryant | |
44 | 7b93fadf | Corey Bryant | #include "net/tap-linux.h" |
45 | 7b93fadf | Corey Bryant | |
46 | 47e98658 | Corey Bryant | #ifdef CONFIG_LIBCAP
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47 | 47e98658 | Corey Bryant | #include <cap-ng.h> |
48 | 47e98658 | Corey Bryant | #endif
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49 | 47e98658 | Corey Bryant | |
50 | bdef79a2 | Corey Bryant | #define DEFAULT_ACL_FILE CONFIG_QEMU_CONFDIR "/bridge.conf" |
51 | bdef79a2 | Corey Bryant | |
52 | bdef79a2 | Corey Bryant | enum {
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53 | bdef79a2 | Corey Bryant | ACL_ALLOW = 0,
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54 | bdef79a2 | Corey Bryant | ACL_ALLOW_ALL, |
55 | bdef79a2 | Corey Bryant | ACL_DENY, |
56 | bdef79a2 | Corey Bryant | ACL_DENY_ALL, |
57 | bdef79a2 | Corey Bryant | }; |
58 | bdef79a2 | Corey Bryant | |
59 | bdef79a2 | Corey Bryant | typedef struct ACLRule { |
60 | bdef79a2 | Corey Bryant | int type;
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61 | bdef79a2 | Corey Bryant | char iface[IFNAMSIZ];
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62 | bdef79a2 | Corey Bryant | QSIMPLEQ_ENTRY(ACLRule) entry; |
63 | bdef79a2 | Corey Bryant | } ACLRule; |
64 | bdef79a2 | Corey Bryant | |
65 | bdef79a2 | Corey Bryant | typedef QSIMPLEQ_HEAD(ACLList, ACLRule) ACLList;
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66 | bdef79a2 | Corey Bryant | |
67 | 7b93fadf | Corey Bryant | static void usage(void) |
68 | 7b93fadf | Corey Bryant | { |
69 | 7b93fadf | Corey Bryant | fprintf(stderr, |
70 | 7b93fadf | Corey Bryant | "Usage: qemu-bridge-helper [--use-vnet] --br=bridge --fd=unixfd\n");
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71 | 7b93fadf | Corey Bryant | } |
72 | 7b93fadf | Corey Bryant | |
73 | bdef79a2 | Corey Bryant | static int parse_acl_file(const char *filename, ACLList *acl_list) |
74 | bdef79a2 | Corey Bryant | { |
75 | bdef79a2 | Corey Bryant | FILE *f; |
76 | bdef79a2 | Corey Bryant | char line[4096]; |
77 | bdef79a2 | Corey Bryant | ACLRule *acl_rule; |
78 | bdef79a2 | Corey Bryant | |
79 | bdef79a2 | Corey Bryant | f = fopen(filename, "r");
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80 | bdef79a2 | Corey Bryant | if (f == NULL) { |
81 | bdef79a2 | Corey Bryant | return -1; |
82 | bdef79a2 | Corey Bryant | } |
83 | bdef79a2 | Corey Bryant | |
84 | bdef79a2 | Corey Bryant | while (fgets(line, sizeof(line), f) != NULL) { |
85 | bdef79a2 | Corey Bryant | char *ptr = line;
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86 | bdef79a2 | Corey Bryant | char *cmd, *arg, *argend;
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87 | bdef79a2 | Corey Bryant | |
88 | bdef79a2 | Corey Bryant | while (isspace(*ptr)) {
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89 | bdef79a2 | Corey Bryant | ptr++; |
90 | bdef79a2 | Corey Bryant | } |
91 | bdef79a2 | Corey Bryant | |
92 | bdef79a2 | Corey Bryant | /* skip comments and empty lines */
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93 | bdef79a2 | Corey Bryant | if (*ptr == '#' || *ptr == 0) { |
94 | bdef79a2 | Corey Bryant | continue;
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95 | bdef79a2 | Corey Bryant | } |
96 | bdef79a2 | Corey Bryant | |
97 | bdef79a2 | Corey Bryant | cmd = ptr; |
98 | bdef79a2 | Corey Bryant | arg = strchr(cmd, ' ');
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99 | bdef79a2 | Corey Bryant | if (arg == NULL) { |
100 | bdef79a2 | Corey Bryant | arg = strchr(cmd, '\t');
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101 | bdef79a2 | Corey Bryant | } |
102 | bdef79a2 | Corey Bryant | |
103 | bdef79a2 | Corey Bryant | if (arg == NULL) { |
104 | bdef79a2 | Corey Bryant | fprintf(stderr, "Invalid config line:\n %s\n", line);
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105 | bdef79a2 | Corey Bryant | fclose(f); |
106 | bdef79a2 | Corey Bryant | errno = EINVAL; |
107 | bdef79a2 | Corey Bryant | return -1; |
108 | bdef79a2 | Corey Bryant | } |
109 | bdef79a2 | Corey Bryant | |
110 | bdef79a2 | Corey Bryant | *arg = 0;
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111 | bdef79a2 | Corey Bryant | arg++; |
112 | bdef79a2 | Corey Bryant | while (isspace(*arg)) {
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113 | bdef79a2 | Corey Bryant | arg++; |
114 | bdef79a2 | Corey Bryant | } |
115 | bdef79a2 | Corey Bryant | |
116 | bdef79a2 | Corey Bryant | argend = arg + strlen(arg); |
117 | bdef79a2 | Corey Bryant | while (arg != argend && isspace(*(argend - 1))) { |
118 | bdef79a2 | Corey Bryant | argend--; |
119 | bdef79a2 | Corey Bryant | } |
120 | bdef79a2 | Corey Bryant | *argend = 0;
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121 | bdef79a2 | Corey Bryant | |
122 | bdef79a2 | Corey Bryant | if (strcmp(cmd, "deny") == 0) { |
123 | bdef79a2 | Corey Bryant | acl_rule = g_malloc(sizeof(*acl_rule));
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124 | bdef79a2 | Corey Bryant | if (strcmp(arg, "all") == 0) { |
125 | bdef79a2 | Corey Bryant | acl_rule->type = ACL_DENY_ALL; |
126 | bdef79a2 | Corey Bryant | } else {
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127 | bdef79a2 | Corey Bryant | acl_rule->type = ACL_DENY; |
128 | bdef79a2 | Corey Bryant | snprintf(acl_rule->iface, IFNAMSIZ, "%s", arg);
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129 | bdef79a2 | Corey Bryant | } |
130 | bdef79a2 | Corey Bryant | QSIMPLEQ_INSERT_TAIL(acl_list, acl_rule, entry); |
131 | bdef79a2 | Corey Bryant | } else if (strcmp(cmd, "allow") == 0) { |
132 | bdef79a2 | Corey Bryant | acl_rule = g_malloc(sizeof(*acl_rule));
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133 | bdef79a2 | Corey Bryant | if (strcmp(arg, "all") == 0) { |
134 | bdef79a2 | Corey Bryant | acl_rule->type = ACL_ALLOW_ALL; |
135 | bdef79a2 | Corey Bryant | } else {
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136 | bdef79a2 | Corey Bryant | acl_rule->type = ACL_ALLOW; |
137 | bdef79a2 | Corey Bryant | snprintf(acl_rule->iface, IFNAMSIZ, "%s", arg);
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138 | bdef79a2 | Corey Bryant | } |
139 | bdef79a2 | Corey Bryant | QSIMPLEQ_INSERT_TAIL(acl_list, acl_rule, entry); |
140 | bdef79a2 | Corey Bryant | } else if (strcmp(cmd, "include") == 0) { |
141 | bdef79a2 | Corey Bryant | /* ignore errors */
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142 | bdef79a2 | Corey Bryant | parse_acl_file(arg, acl_list); |
143 | bdef79a2 | Corey Bryant | } else {
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144 | bdef79a2 | Corey Bryant | fprintf(stderr, "Unknown command `%s'\n", cmd);
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145 | bdef79a2 | Corey Bryant | fclose(f); |
146 | bdef79a2 | Corey Bryant | errno = EINVAL; |
147 | bdef79a2 | Corey Bryant | return -1; |
148 | bdef79a2 | Corey Bryant | } |
149 | bdef79a2 | Corey Bryant | } |
150 | bdef79a2 | Corey Bryant | |
151 | bdef79a2 | Corey Bryant | fclose(f); |
152 | bdef79a2 | Corey Bryant | |
153 | bdef79a2 | Corey Bryant | return 0; |
154 | bdef79a2 | Corey Bryant | } |
155 | bdef79a2 | Corey Bryant | |
156 | 7b93fadf | Corey Bryant | static bool has_vnet_hdr(int fd) |
157 | 7b93fadf | Corey Bryant | { |
158 | 7b93fadf | Corey Bryant | unsigned int features = 0; |
159 | 7b93fadf | Corey Bryant | |
160 | 7b93fadf | Corey Bryant | if (ioctl(fd, TUNGETFEATURES, &features) == -1) { |
161 | 7b93fadf | Corey Bryant | return false; |
162 | 7b93fadf | Corey Bryant | } |
163 | 7b93fadf | Corey Bryant | |
164 | 7b93fadf | Corey Bryant | if (!(features & IFF_VNET_HDR)) {
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165 | 7b93fadf | Corey Bryant | return false; |
166 | 7b93fadf | Corey Bryant | } |
167 | 7b93fadf | Corey Bryant | |
168 | 7b93fadf | Corey Bryant | return true; |
169 | 7b93fadf | Corey Bryant | } |
170 | 7b93fadf | Corey Bryant | |
171 | 7b93fadf | Corey Bryant | static void prep_ifreq(struct ifreq *ifr, const char *ifname) |
172 | 7b93fadf | Corey Bryant | { |
173 | 7b93fadf | Corey Bryant | memset(ifr, 0, sizeof(*ifr)); |
174 | 7b93fadf | Corey Bryant | snprintf(ifr->ifr_name, IFNAMSIZ, "%s", ifname);
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175 | 7b93fadf | Corey Bryant | } |
176 | 7b93fadf | Corey Bryant | |
177 | 7b93fadf | Corey Bryant | static int send_fd(int c, int fd) |
178 | 7b93fadf | Corey Bryant | { |
179 | 7b93fadf | Corey Bryant | char msgbuf[CMSG_SPACE(sizeof(fd))]; |
180 | 7b93fadf | Corey Bryant | struct msghdr msg = {
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181 | 7b93fadf | Corey Bryant | .msg_control = msgbuf, |
182 | 7b93fadf | Corey Bryant | .msg_controllen = sizeof(msgbuf),
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183 | 7b93fadf | Corey Bryant | }; |
184 | 7b93fadf | Corey Bryant | struct cmsghdr *cmsg;
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185 | 7b93fadf | Corey Bryant | struct iovec iov;
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186 | 7b93fadf | Corey Bryant | char req[1] = { 0x00 }; |
187 | 7b93fadf | Corey Bryant | |
188 | 7b93fadf | Corey Bryant | cmsg = CMSG_FIRSTHDR(&msg); |
189 | 7b93fadf | Corey Bryant | cmsg->cmsg_level = SOL_SOCKET; |
190 | 7b93fadf | Corey Bryant | cmsg->cmsg_type = SCM_RIGHTS; |
191 | 7b93fadf | Corey Bryant | cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
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192 | 7b93fadf | Corey Bryant | msg.msg_controllen = cmsg->cmsg_len; |
193 | 7b93fadf | Corey Bryant | |
194 | 7b93fadf | Corey Bryant | iov.iov_base = req; |
195 | 7b93fadf | Corey Bryant | iov.iov_len = sizeof(req);
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196 | 7b93fadf | Corey Bryant | |
197 | 7b93fadf | Corey Bryant | msg.msg_iov = &iov; |
198 | 7b93fadf | Corey Bryant | msg.msg_iovlen = 1;
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199 | 7b93fadf | Corey Bryant | memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd));
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200 | 7b93fadf | Corey Bryant | |
201 | 7b93fadf | Corey Bryant | return sendmsg(c, &msg, 0); |
202 | 7b93fadf | Corey Bryant | } |
203 | 7b93fadf | Corey Bryant | |
204 | 47e98658 | Corey Bryant | #ifdef CONFIG_LIBCAP
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205 | 47e98658 | Corey Bryant | static int drop_privileges(void) |
206 | 47e98658 | Corey Bryant | { |
207 | 47e98658 | Corey Bryant | /* clear all capabilities */
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208 | 47e98658 | Corey Bryant | capng_clear(CAPNG_SELECT_BOTH); |
209 | 47e98658 | Corey Bryant | |
210 | 47e98658 | Corey Bryant | if (capng_update(CAPNG_ADD, CAPNG_EFFECTIVE | CAPNG_PERMITTED,
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211 | 47e98658 | Corey Bryant | CAP_NET_ADMIN) < 0) {
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212 | 47e98658 | Corey Bryant | return -1; |
213 | 47e98658 | Corey Bryant | } |
214 | 47e98658 | Corey Bryant | |
215 | 47e98658 | Corey Bryant | /* change to calling user's real uid and gid, retaining supplemental
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216 | 47e98658 | Corey Bryant | * groups and CAP_NET_ADMIN */
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217 | 47e98658 | Corey Bryant | if (capng_change_id(getuid(), getgid(), CAPNG_CLEAR_BOUNDING)) {
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218 | 47e98658 | Corey Bryant | return -1; |
219 | 47e98658 | Corey Bryant | } |
220 | 47e98658 | Corey Bryant | |
221 | 47e98658 | Corey Bryant | return 0; |
222 | 47e98658 | Corey Bryant | } |
223 | 47e98658 | Corey Bryant | #endif
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224 | 47e98658 | Corey Bryant | |
225 | 7b93fadf | Corey Bryant | int main(int argc, char **argv) |
226 | 7b93fadf | Corey Bryant | { |
227 | 7b93fadf | Corey Bryant | struct ifreq ifr;
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228 | 34309d2b | Corey Bryant | #ifndef SIOCBRADDIF
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229 | 34309d2b | Corey Bryant | unsigned long ifargs[4]; |
230 | 34309d2b | Corey Bryant | #endif
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231 | 34309d2b | Corey Bryant | int ifindex;
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232 | 7b93fadf | Corey Bryant | int fd, ctlfd, unixfd = -1; |
233 | 7b93fadf | Corey Bryant | int use_vnet = 0; |
234 | 7b93fadf | Corey Bryant | int mtu;
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235 | 7b93fadf | Corey Bryant | const char *bridge = NULL; |
236 | 7b93fadf | Corey Bryant | char iface[IFNAMSIZ];
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237 | 7b93fadf | Corey Bryant | int index;
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238 | bdef79a2 | Corey Bryant | ACLRule *acl_rule; |
239 | bdef79a2 | Corey Bryant | ACLList acl_list; |
240 | bdef79a2 | Corey Bryant | int access_allowed, access_denied;
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241 | 7b93fadf | Corey Bryant | int ret = EXIT_SUCCESS;
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242 | 7b93fadf | Corey Bryant | |
243 | 47e98658 | Corey Bryant | #ifdef CONFIG_LIBCAP
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244 | 47e98658 | Corey Bryant | /* if we're run from an suid binary, immediately drop privileges preserving
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245 | 47e98658 | Corey Bryant | * cap_net_admin */
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246 | 47e98658 | Corey Bryant | if (geteuid() == 0 && getuid() != geteuid()) { |
247 | 47e98658 | Corey Bryant | if (drop_privileges() == -1) { |
248 | 47e98658 | Corey Bryant | fprintf(stderr, "failed to drop privileges\n");
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249 | 47e98658 | Corey Bryant | return 1; |
250 | 47e98658 | Corey Bryant | } |
251 | 47e98658 | Corey Bryant | } |
252 | 47e98658 | Corey Bryant | #endif
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253 | 47e98658 | Corey Bryant | |
254 | 7b93fadf | Corey Bryant | /* parse arguments */
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255 | 7b93fadf | Corey Bryant | for (index = 1; index < argc; index++) { |
256 | 7b93fadf | Corey Bryant | if (strcmp(argv[index], "--use-vnet") == 0) { |
257 | 7b93fadf | Corey Bryant | use_vnet = 1;
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258 | 7b93fadf | Corey Bryant | } else if (strncmp(argv[index], "--br=", 5) == 0) { |
259 | 7b93fadf | Corey Bryant | bridge = &argv[index][5];
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260 | 7b93fadf | Corey Bryant | } else if (strncmp(argv[index], "--fd=", 5) == 0) { |
261 | 7b93fadf | Corey Bryant | unixfd = atoi(&argv[index][5]);
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262 | 7b93fadf | Corey Bryant | } else {
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263 | 7b93fadf | Corey Bryant | usage(); |
264 | 7b93fadf | Corey Bryant | return EXIT_FAILURE;
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265 | 7b93fadf | Corey Bryant | } |
266 | 7b93fadf | Corey Bryant | } |
267 | 7b93fadf | Corey Bryant | |
268 | 7b93fadf | Corey Bryant | if (bridge == NULL || unixfd == -1) { |
269 | 7b93fadf | Corey Bryant | usage(); |
270 | 7b93fadf | Corey Bryant | return EXIT_FAILURE;
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271 | 7b93fadf | Corey Bryant | } |
272 | 7b93fadf | Corey Bryant | |
273 | bdef79a2 | Corey Bryant | /* parse default acl file */
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274 | bdef79a2 | Corey Bryant | QSIMPLEQ_INIT(&acl_list); |
275 | bdef79a2 | Corey Bryant | if (parse_acl_file(DEFAULT_ACL_FILE, &acl_list) == -1) { |
276 | bdef79a2 | Corey Bryant | fprintf(stderr, "failed to parse default acl file `%s'\n",
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277 | bdef79a2 | Corey Bryant | DEFAULT_ACL_FILE); |
278 | bdef79a2 | Corey Bryant | ret = EXIT_FAILURE; |
279 | bdef79a2 | Corey Bryant | goto cleanup;
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280 | bdef79a2 | Corey Bryant | } |
281 | bdef79a2 | Corey Bryant | |
282 | bdef79a2 | Corey Bryant | /* validate bridge against acl -- default policy is to deny
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283 | bdef79a2 | Corey Bryant | * according acl policy if we have a deny and allow both
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284 | bdef79a2 | Corey Bryant | * then deny should always win over allow
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285 | bdef79a2 | Corey Bryant | */
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286 | bdef79a2 | Corey Bryant | access_allowed = 0;
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287 | bdef79a2 | Corey Bryant | access_denied = 0;
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288 | bdef79a2 | Corey Bryant | QSIMPLEQ_FOREACH(acl_rule, &acl_list, entry) { |
289 | bdef79a2 | Corey Bryant | switch (acl_rule->type) {
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290 | bdef79a2 | Corey Bryant | case ACL_ALLOW_ALL:
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291 | bdef79a2 | Corey Bryant | access_allowed = 1;
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292 | bdef79a2 | Corey Bryant | break;
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293 | bdef79a2 | Corey Bryant | case ACL_ALLOW:
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294 | bdef79a2 | Corey Bryant | if (strcmp(bridge, acl_rule->iface) == 0) { |
295 | bdef79a2 | Corey Bryant | access_allowed = 1;
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296 | bdef79a2 | Corey Bryant | } |
297 | bdef79a2 | Corey Bryant | break;
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298 | bdef79a2 | Corey Bryant | case ACL_DENY_ALL:
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299 | bdef79a2 | Corey Bryant | access_denied = 1;
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300 | bdef79a2 | Corey Bryant | break;
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301 | bdef79a2 | Corey Bryant | case ACL_DENY:
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302 | bdef79a2 | Corey Bryant | if (strcmp(bridge, acl_rule->iface) == 0) { |
303 | bdef79a2 | Corey Bryant | access_denied = 1;
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304 | bdef79a2 | Corey Bryant | } |
305 | bdef79a2 | Corey Bryant | break;
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306 | bdef79a2 | Corey Bryant | } |
307 | bdef79a2 | Corey Bryant | } |
308 | bdef79a2 | Corey Bryant | |
309 | bdef79a2 | Corey Bryant | if ((access_allowed == 0) || (access_denied == 1)) { |
310 | bdef79a2 | Corey Bryant | fprintf(stderr, "access denied by acl file\n");
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311 | bdef79a2 | Corey Bryant | ret = EXIT_FAILURE; |
312 | bdef79a2 | Corey Bryant | goto cleanup;
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313 | bdef79a2 | Corey Bryant | } |
314 | bdef79a2 | Corey Bryant | |
315 | 7b93fadf | Corey Bryant | /* open a socket to use to control the network interfaces */
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316 | 7b93fadf | Corey Bryant | ctlfd = socket(AF_INET, SOCK_STREAM, 0);
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317 | 7b93fadf | Corey Bryant | if (ctlfd == -1) { |
318 | 7b93fadf | Corey Bryant | fprintf(stderr, "failed to open control socket: %s\n", strerror(errno));
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319 | 7b93fadf | Corey Bryant | ret = EXIT_FAILURE; |
320 | 7b93fadf | Corey Bryant | goto cleanup;
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321 | 7b93fadf | Corey Bryant | } |
322 | 7b93fadf | Corey Bryant | |
323 | 7b93fadf | Corey Bryant | /* open the tap device */
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324 | 7b93fadf | Corey Bryant | fd = open("/dev/net/tun", O_RDWR);
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325 | 7b93fadf | Corey Bryant | if (fd == -1) { |
326 | 7b93fadf | Corey Bryant | fprintf(stderr, "failed to open /dev/net/tun: %s\n", strerror(errno));
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327 | 7b93fadf | Corey Bryant | ret = EXIT_FAILURE; |
328 | 7b93fadf | Corey Bryant | goto cleanup;
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329 | 7b93fadf | Corey Bryant | } |
330 | 7b93fadf | Corey Bryant | |
331 | 7b93fadf | Corey Bryant | /* request a tap device, disable PI, and add vnet header support if
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332 | 7b93fadf | Corey Bryant | * requested and it's available. */
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333 | 7b93fadf | Corey Bryant | prep_ifreq(&ifr, "tap%d");
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334 | 7b93fadf | Corey Bryant | ifr.ifr_flags = IFF_TAP|IFF_NO_PI; |
335 | 7b93fadf | Corey Bryant | if (use_vnet && has_vnet_hdr(fd)) {
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336 | 7b93fadf | Corey Bryant | ifr.ifr_flags |= IFF_VNET_HDR; |
337 | 7b93fadf | Corey Bryant | } |
338 | 7b93fadf | Corey Bryant | |
339 | 7b93fadf | Corey Bryant | if (ioctl(fd, TUNSETIFF, &ifr) == -1) { |
340 | 7b93fadf | Corey Bryant | fprintf(stderr, "failed to create tun device: %s\n", strerror(errno));
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341 | 7b93fadf | Corey Bryant | ret = EXIT_FAILURE; |
342 | 7b93fadf | Corey Bryant | goto cleanup;
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343 | 7b93fadf | Corey Bryant | } |
344 | 7b93fadf | Corey Bryant | |
345 | 7b93fadf | Corey Bryant | /* save tap device name */
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346 | 7b93fadf | Corey Bryant | snprintf(iface, sizeof(iface), "%s", ifr.ifr_name); |
347 | 7b93fadf | Corey Bryant | |
348 | 7b93fadf | Corey Bryant | /* get the mtu of the bridge */
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349 | 7b93fadf | Corey Bryant | prep_ifreq(&ifr, bridge); |
350 | 7b93fadf | Corey Bryant | if (ioctl(ctlfd, SIOCGIFMTU, &ifr) == -1) { |
351 | 7b93fadf | Corey Bryant | fprintf(stderr, "failed to get mtu of bridge `%s': %s\n",
|
352 | 7b93fadf | Corey Bryant | bridge, strerror(errno)); |
353 | 7b93fadf | Corey Bryant | ret = EXIT_FAILURE; |
354 | 7b93fadf | Corey Bryant | goto cleanup;
|
355 | 7b93fadf | Corey Bryant | } |
356 | 7b93fadf | Corey Bryant | |
357 | 7b93fadf | Corey Bryant | /* save mtu */
|
358 | 7b93fadf | Corey Bryant | mtu = ifr.ifr_mtu; |
359 | 7b93fadf | Corey Bryant | |
360 | 7b93fadf | Corey Bryant | /* set the mtu of the interface based on the bridge */
|
361 | 7b93fadf | Corey Bryant | prep_ifreq(&ifr, iface); |
362 | 7b93fadf | Corey Bryant | ifr.ifr_mtu = mtu; |
363 | 7b93fadf | Corey Bryant | if (ioctl(ctlfd, SIOCSIFMTU, &ifr) == -1) { |
364 | 7b93fadf | Corey Bryant | fprintf(stderr, "failed to set mtu of device `%s' to %d: %s\n",
|
365 | 7b93fadf | Corey Bryant | iface, mtu, strerror(errno)); |
366 | 7b93fadf | Corey Bryant | ret = EXIT_FAILURE; |
367 | 7b93fadf | Corey Bryant | goto cleanup;
|
368 | 7b93fadf | Corey Bryant | } |
369 | 7b93fadf | Corey Bryant | |
370 | 226ecabf | Paolo Bonzini | /* Linux uses the lowest enslaved MAC address as the MAC address of
|
371 | 226ecabf | Paolo Bonzini | * the bridge. Set MAC address to a high value so that it doesn't
|
372 | 226ecabf | Paolo Bonzini | * affect the MAC address of the bridge.
|
373 | 226ecabf | Paolo Bonzini | */
|
374 | 226ecabf | Paolo Bonzini | if (ioctl(ctlfd, SIOCGIFHWADDR, &ifr) < 0) { |
375 | 226ecabf | Paolo Bonzini | fprintf(stderr, "failed to get MAC address of device `%s': %s\n",
|
376 | 226ecabf | Paolo Bonzini | iface, strerror(errno)); |
377 | 226ecabf | Paolo Bonzini | ret = EXIT_FAILURE; |
378 | 226ecabf | Paolo Bonzini | goto cleanup;
|
379 | 226ecabf | Paolo Bonzini | } |
380 | 226ecabf | Paolo Bonzini | ifr.ifr_hwaddr.sa_data[0] = 0xFE; |
381 | 226ecabf | Paolo Bonzini | if (ioctl(ctlfd, SIOCSIFHWADDR, &ifr) < 0) { |
382 | 226ecabf | Paolo Bonzini | fprintf(stderr, "failed to set MAC address of device `%s': %s\n",
|
383 | 226ecabf | Paolo Bonzini | iface, strerror(errno)); |
384 | 226ecabf | Paolo Bonzini | ret = EXIT_FAILURE; |
385 | 226ecabf | Paolo Bonzini | goto cleanup;
|
386 | 226ecabf | Paolo Bonzini | } |
387 | 226ecabf | Paolo Bonzini | |
388 | 7b93fadf | Corey Bryant | /* add the interface to the bridge */
|
389 | 7b93fadf | Corey Bryant | prep_ifreq(&ifr, bridge); |
390 | 34309d2b | Corey Bryant | ifindex = if_nametoindex(iface); |
391 | 34309d2b | Corey Bryant | #ifndef SIOCBRADDIF
|
392 | 34309d2b | Corey Bryant | ifargs[0] = BRCTL_ADD_IF;
|
393 | 34309d2b | Corey Bryant | ifargs[1] = ifindex;
|
394 | 34309d2b | Corey Bryant | ifargs[2] = 0; |
395 | 34309d2b | Corey Bryant | ifargs[3] = 0; |
396 | 34309d2b | Corey Bryant | ifr.ifr_data = (void *)ifargs;
|
397 | 34309d2b | Corey Bryant | ret = ioctl(ctlfd, SIOCDEVPRIVATE, &ifr); |
398 | 34309d2b | Corey Bryant | #else
|
399 | 34309d2b | Corey Bryant | ifr.ifr_ifindex = ifindex; |
400 | 34309d2b | Corey Bryant | ret = ioctl(ctlfd, SIOCBRADDIF, &ifr); |
401 | 34309d2b | Corey Bryant | #endif
|
402 | 34309d2b | Corey Bryant | if (ret == -1) { |
403 | 7b93fadf | Corey Bryant | fprintf(stderr, "failed to add interface `%s' to bridge `%s': %s\n",
|
404 | 7b93fadf | Corey Bryant | iface, bridge, strerror(errno)); |
405 | 7b93fadf | Corey Bryant | ret = EXIT_FAILURE; |
406 | 7b93fadf | Corey Bryant | goto cleanup;
|
407 | 7b93fadf | Corey Bryant | } |
408 | 7b93fadf | Corey Bryant | |
409 | 7b93fadf | Corey Bryant | /* bring the interface up */
|
410 | 7b93fadf | Corey Bryant | prep_ifreq(&ifr, iface); |
411 | 7b93fadf | Corey Bryant | if (ioctl(ctlfd, SIOCGIFFLAGS, &ifr) == -1) { |
412 | 7b93fadf | Corey Bryant | fprintf(stderr, "failed to get interface flags for `%s': %s\n",
|
413 | 7b93fadf | Corey Bryant | iface, strerror(errno)); |
414 | 7b93fadf | Corey Bryant | ret = EXIT_FAILURE; |
415 | 7b93fadf | Corey Bryant | goto cleanup;
|
416 | 7b93fadf | Corey Bryant | } |
417 | 7b93fadf | Corey Bryant | |
418 | 7b93fadf | Corey Bryant | ifr.ifr_flags |= IFF_UP; |
419 | 7b93fadf | Corey Bryant | if (ioctl(ctlfd, SIOCSIFFLAGS, &ifr) == -1) { |
420 | 7b93fadf | Corey Bryant | fprintf(stderr, "failed to bring up interface `%s': %s\n",
|
421 | 7b93fadf | Corey Bryant | iface, strerror(errno)); |
422 | 7b93fadf | Corey Bryant | ret = EXIT_FAILURE; |
423 | 7b93fadf | Corey Bryant | goto cleanup;
|
424 | 7b93fadf | Corey Bryant | } |
425 | 7b93fadf | Corey Bryant | |
426 | 7b93fadf | Corey Bryant | /* write fd to the domain socket */
|
427 | 7b93fadf | Corey Bryant | if (send_fd(unixfd, fd) == -1) { |
428 | 7b93fadf | Corey Bryant | fprintf(stderr, "failed to write fd to unix socket: %s\n",
|
429 | 7b93fadf | Corey Bryant | strerror(errno)); |
430 | 7b93fadf | Corey Bryant | ret = EXIT_FAILURE; |
431 | 7b93fadf | Corey Bryant | goto cleanup;
|
432 | 7b93fadf | Corey Bryant | } |
433 | 7b93fadf | Corey Bryant | |
434 | 7b93fadf | Corey Bryant | /* ... */
|
435 | 7b93fadf | Corey Bryant | |
436 | 7b93fadf | Corey Bryant | /* profit! */
|
437 | 7b93fadf | Corey Bryant | |
438 | 7b93fadf | Corey Bryant | cleanup:
|
439 | 7b93fadf | Corey Bryant | |
440 | bdef79a2 | Corey Bryant | while ((acl_rule = QSIMPLEQ_FIRST(&acl_list)) != NULL) { |
441 | bdef79a2 | Corey Bryant | QSIMPLEQ_REMOVE_HEAD(&acl_list, entry); |
442 | bdef79a2 | Corey Bryant | g_free(acl_rule); |
443 | bdef79a2 | Corey Bryant | } |
444 | bdef79a2 | Corey Bryant | |
445 | 7b93fadf | Corey Bryant | return ret;
|
446 | 7b93fadf | Corey Bryant | } |