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Commit | Line | Data |
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e7e92325 MM |
1 | /* |
2 | * QEMU System Emulator | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | ||
2744d920 | 25 | #include "qemu/osdep.h" |
da34e65c | 26 | #include "qapi/error.h" |
1422e32d | 27 | #include "tap_int.h" |
f348b6d1 | 28 | #include "qemu/cutils.h" |
9c17d615 | 29 | #include "sysemu/sysemu.h" |
1de7afc9 | 30 | #include "qemu/error-report.h" |
e7e92325 | 31 | |
8677de2b | 32 | #if defined(__NetBSD__) || defined(__FreeBSD__) |
45c245bf MB |
33 | #include <sys/ioctl.h> |
34 | #include <net/if.h> | |
e7e92325 MM |
35 | #include <net/if_tap.h> |
36 | #endif | |
37 | ||
8677de2b | 38 | #ifndef __FreeBSD__ |
264986e2 | 39 | int tap_open(char *ifname, int ifname_size, int *vnet_hdr, |
468dd824 | 40 | int vnet_hdr_required, int mq_required, Error **errp) |
e7e92325 MM |
41 | { |
42 | int fd; | |
45c245bf MB |
43 | #ifdef TAPGIFNAME |
44 | struct ifreq ifr; | |
45 | #else | |
e7e92325 MM |
46 | char *dev; |
47 | struct stat s; | |
45c245bf | 48 | #endif |
e7e92325 | 49 | |
5f668643 | 50 | /* if no ifname is given, always start the search from tap0/tun0. */ |
2f859a3c JL |
51 | int i; |
52 | char dname[100]; | |
53 | ||
54 | for (i = 0; i < 10; i++) { | |
55 | if (*ifname) { | |
56 | snprintf(dname, sizeof dname, "/dev/%s", ifname); | |
57 | } else { | |
5f668643 BS |
58 | #if defined(__OpenBSD__) |
59 | snprintf(dname, sizeof dname, "/dev/tun%d", i); | |
60 | #else | |
2f859a3c | 61 | snprintf(dname, sizeof dname, "/dev/tap%d", i); |
5f668643 | 62 | #endif |
2f859a3c JL |
63 | } |
64 | TFR(fd = open(dname, O_RDWR)); | |
65 | if (fd >= 0) { | |
66 | break; | |
67 | } | |
68 | else if (errno == ENXIO || errno == ENOENT) { | |
69 | break; | |
70 | } | |
71 | if (*ifname) { | |
72 | break; | |
73 | } | |
74 | } | |
75 | if (fd < 0) { | |
4bce487e | 76 | error_setg_errno(errp, errno, "could not open %s", dname); |
2f859a3c JL |
77 | return -1; |
78 | } | |
e7e92325 | 79 | |
45c245bf MB |
80 | #ifdef TAPGIFNAME |
81 | if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) { | |
4bce487e | 82 | error_setg_errno(errp, errno, "could not get tap name"); |
45c245bf MB |
83 | return -1; |
84 | } | |
85 | pstrcpy(ifname, ifname_size, ifr.ifr_name); | |
86 | #else | |
87 | if (fstat(fd, &s) < 0) { | |
4bce487e | 88 | error_setg_errno(errp, errno, "could not stat %s", dname); |
45c245bf MB |
89 | return -1; |
90 | } | |
e7e92325 MM |
91 | dev = devname(s.st_rdev, S_IFCHR); |
92 | pstrcpy(ifname, ifname_size, dev); | |
45c245bf | 93 | #endif |
e7e92325 | 94 | |
39ca4c08 JL |
95 | if (*vnet_hdr) { |
96 | /* BSD doesn't have IFF_VNET_HDR */ | |
97 | *vnet_hdr = 0; | |
98 | ||
99 | if (vnet_hdr_required && !*vnet_hdr) { | |
4bce487e MA |
100 | error_setg(errp, "vnet_hdr=1 requested, but no kernel " |
101 | "support for IFF_VNET_HDR available"); | |
39ca4c08 JL |
102 | close(fd); |
103 | return -1; | |
104 | } | |
105 | } | |
e7e92325 MM |
106 | fcntl(fd, F_SETFL, O_NONBLOCK); |
107 | return fd; | |
108 | } | |
15ac913b | 109 | |
8677de2b RPM |
110 | #else /* __FreeBSD__ */ |
111 | ||
112 | #define PATH_NET_TAP "/dev/tap" | |
113 | ||
bd54a9f9 | 114 | static int tap_open_clone(char *ifname, int ifname_size, Error **errp) |
8677de2b RPM |
115 | { |
116 | int fd, s, ret; | |
117 | struct ifreq ifr; | |
118 | ||
119 | TFR(fd = open(PATH_NET_TAP, O_RDWR)); | |
120 | if (fd < 0) { | |
4bce487e | 121 | error_setg_errno(errp, errno, "could not open %s", PATH_NET_TAP); |
8677de2b RPM |
122 | return -1; |
123 | } | |
124 | ||
125 | memset(&ifr, 0, sizeof(ifr)); | |
126 | ||
127 | ret = ioctl(fd, TAPGIFNAME, (void *)&ifr); | |
128 | if (ret < 0) { | |
4bce487e | 129 | error_setg_errno(errp, errno, "could not get tap interface name"); |
bd54a9f9 EM |
130 | close(fd); |
131 | return -1; | |
8677de2b RPM |
132 | } |
133 | ||
134 | if (ifname[0] != '\0') { | |
135 | /* User requested the interface to have a specific name */ | |
136 | s = socket(AF_LOCAL, SOCK_DGRAM, 0); | |
137 | if (s < 0) { | |
4bce487e MA |
138 | error_setg_errno(errp, errno, |
139 | "could not open socket to set interface name"); | |
bd54a9f9 EM |
140 | close(fd); |
141 | return -1; | |
8677de2b RPM |
142 | } |
143 | ifr.ifr_data = ifname; | |
144 | ret = ioctl(s, SIOCSIFNAME, (void *)&ifr); | |
145 | close(s); | |
146 | if (ret < 0) { | |
4bce487e | 147 | error_setg(errp, "could not set tap interface name"); |
bd54a9f9 EM |
148 | close(fd); |
149 | return -1; | |
8677de2b RPM |
150 | } |
151 | } else { | |
152 | pstrcpy(ifname, ifname_size, ifr.ifr_name); | |
153 | } | |
154 | ||
bd54a9f9 EM |
155 | return fd; |
156 | } | |
157 | ||
158 | int tap_open(char *ifname, int ifname_size, int *vnet_hdr, | |
159 | int vnet_hdr_required, int mq_required, Error **errp) | |
160 | { | |
161 | int fd = -1; | |
162 | ||
163 | /* If the specified tap device already exists just use it. */ | |
164 | if (ifname[0] != '\0') { | |
165 | char dname[100]; | |
166 | snprintf(dname, sizeof dname, "/dev/%s", ifname); | |
167 | TFR(fd = open(dname, O_RDWR)); | |
168 | if (fd < 0 && errno != ENOENT) { | |
169 | error_setg_errno(errp, errno, "could not open %s", dname); | |
170 | return -1; | |
171 | } | |
172 | } | |
173 | ||
174 | if (fd < 0) { | |
175 | /* Tap device not specified or does not exist. */ | |
176 | if ((fd = tap_open_clone(ifname, ifname_size, errp)) < 0) { | |
177 | return -1; | |
178 | } | |
179 | } | |
180 | ||
8677de2b RPM |
181 | if (*vnet_hdr) { |
182 | /* BSD doesn't have IFF_VNET_HDR */ | |
183 | *vnet_hdr = 0; | |
184 | ||
185 | if (vnet_hdr_required && !*vnet_hdr) { | |
4bce487e MA |
186 | error_setg(errp, "vnet_hdr=1 requested, but no kernel " |
187 | "support for IFF_VNET_HDR available"); | |
8677de2b RPM |
188 | goto error; |
189 | } | |
190 | } | |
191 | if (mq_required) { | |
4bce487e MA |
192 | error_setg(errp, "mq_required requested, but no kernel support" |
193 | " for IFF_MULTI_QUEUE available"); | |
8677de2b RPM |
194 | goto error; |
195 | } | |
196 | ||
197 | fcntl(fd, F_SETFL, O_NONBLOCK); | |
198 | return fd; | |
199 | ||
200 | error: | |
201 | close(fd); | |
202 | return -1; | |
203 | } | |
204 | #endif /* __FreeBSD__ */ | |
205 | ||
80b832c3 | 206 | void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp) |
15ac913b | 207 | { |
15ac913b | 208 | } |
dc69004c MM |
209 | |
210 | int tap_probe_vnet_hdr(int fd) | |
211 | { | |
212 | return 0; | |
213 | } | |
1faac1f7 | 214 | |
9c282718 MM |
215 | int tap_probe_has_ufo(int fd) |
216 | { | |
217 | return 0; | |
218 | } | |
219 | ||
445d892f MT |
220 | int tap_probe_vnet_hdr_len(int fd, int len) |
221 | { | |
222 | return 0; | |
223 | } | |
224 | ||
225 | void tap_fd_set_vnet_hdr_len(int fd, int len) | |
226 | { | |
227 | } | |
228 | ||
4ee9b43b MT |
229 | int tap_fd_set_vnet_le(int fd, int is_le) |
230 | { | |
231 | return -EINVAL; | |
232 | } | |
233 | ||
234 | int tap_fd_set_vnet_be(int fd, int is_be) | |
235 | { | |
236 | return -EINVAL; | |
237 | } | |
238 | ||
1faac1f7 MM |
239 | void tap_fd_set_offload(int fd, int csum, int tso4, |
240 | int tso6, int ecn, int ufo) | |
241 | { | |
242 | } | |
94fdc6d0 JW |
243 | |
244 | int tap_fd_enable(int fd) | |
245 | { | |
246 | return -1; | |
247 | } | |
248 | ||
249 | int tap_fd_disable(int fd) | |
250 | { | |
251 | return -1; | |
252 | } | |
253 | ||
e5dc0b40 JW |
254 | int tap_fd_get_ifname(int fd, char *ifname) |
255 | { | |
256 | return -1; | |
257 | } |