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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" |
1de7afc9 | 29 | #include "qemu/error-report.h" |
e7e92325 | 30 | |
8677de2b | 31 | #if defined(__NetBSD__) || defined(__FreeBSD__) |
45c245bf MB |
32 | #include <sys/ioctl.h> |
33 | #include <net/if.h> | |
e7e92325 MM |
34 | #include <net/if_tap.h> |
35 | #endif | |
36 | ||
8677de2b | 37 | #ifndef __FreeBSD__ |
264986e2 | 38 | int tap_open(char *ifname, int ifname_size, int *vnet_hdr, |
468dd824 | 39 | int vnet_hdr_required, int mq_required, Error **errp) |
e7e92325 MM |
40 | { |
41 | int fd; | |
45c245bf MB |
42 | #ifdef TAPGIFNAME |
43 | struct ifreq ifr; | |
44 | #else | |
e7e92325 MM |
45 | char *dev; |
46 | struct stat s; | |
45c245bf | 47 | #endif |
e7e92325 | 48 | |
5f668643 | 49 | /* if no ifname is given, always start the search from tap0/tun0. */ |
2f859a3c JL |
50 | int i; |
51 | char dname[100]; | |
52 | ||
53 | for (i = 0; i < 10; i++) { | |
54 | if (*ifname) { | |
55 | snprintf(dname, sizeof dname, "/dev/%s", ifname); | |
56 | } else { | |
57 | snprintf(dname, sizeof dname, "/dev/tap%d", i); | |
58 | } | |
8b6aa693 | 59 | fd = RETRY_ON_EINTR(open(dname, O_RDWR)); |
2f859a3c JL |
60 | if (fd >= 0) { |
61 | break; | |
62 | } | |
63 | else if (errno == ENXIO || errno == ENOENT) { | |
64 | break; | |
65 | } | |
66 | if (*ifname) { | |
67 | break; | |
68 | } | |
69 | } | |
70 | if (fd < 0) { | |
4bce487e | 71 | error_setg_errno(errp, errno, "could not open %s", dname); |
2f859a3c JL |
72 | return -1; |
73 | } | |
e7e92325 | 74 | |
45c245bf MB |
75 | #ifdef TAPGIFNAME |
76 | if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) { | |
4bce487e | 77 | error_setg_errno(errp, errno, "could not get tap name"); |
45c245bf MB |
78 | return -1; |
79 | } | |
80 | pstrcpy(ifname, ifname_size, ifr.ifr_name); | |
81 | #else | |
82 | if (fstat(fd, &s) < 0) { | |
4bce487e | 83 | error_setg_errno(errp, errno, "could not stat %s", dname); |
45c245bf MB |
84 | return -1; |
85 | } | |
e7e92325 MM |
86 | dev = devname(s.st_rdev, S_IFCHR); |
87 | pstrcpy(ifname, ifname_size, dev); | |
45c245bf | 88 | #endif |
e7e92325 | 89 | |
39ca4c08 JL |
90 | if (*vnet_hdr) { |
91 | /* BSD doesn't have IFF_VNET_HDR */ | |
92 | *vnet_hdr = 0; | |
93 | ||
94 | if (vnet_hdr_required && !*vnet_hdr) { | |
4bce487e MA |
95 | error_setg(errp, "vnet_hdr=1 requested, but no kernel " |
96 | "support for IFF_VNET_HDR available"); | |
39ca4c08 JL |
97 | close(fd); |
98 | return -1; | |
99 | } | |
100 | } | |
22e135fc | 101 | g_unix_set_fd_nonblocking(fd, true, NULL); |
e7e92325 MM |
102 | return fd; |
103 | } | |
15ac913b | 104 | |
8677de2b RPM |
105 | #else /* __FreeBSD__ */ |
106 | ||
107 | #define PATH_NET_TAP "/dev/tap" | |
108 | ||
bd54a9f9 | 109 | static int tap_open_clone(char *ifname, int ifname_size, Error **errp) |
8677de2b RPM |
110 | { |
111 | int fd, s, ret; | |
112 | struct ifreq ifr; | |
113 | ||
8b6aa693 | 114 | fd = RETRY_ON_EINTR(open(PATH_NET_TAP, O_RDWR)); |
8677de2b | 115 | if (fd < 0) { |
4bce487e | 116 | error_setg_errno(errp, errno, "could not open %s", PATH_NET_TAP); |
8677de2b RPM |
117 | return -1; |
118 | } | |
119 | ||
120 | memset(&ifr, 0, sizeof(ifr)); | |
121 | ||
122 | ret = ioctl(fd, TAPGIFNAME, (void *)&ifr); | |
123 | if (ret < 0) { | |
4bce487e | 124 | error_setg_errno(errp, errno, "could not get tap interface name"); |
bd54a9f9 EM |
125 | close(fd); |
126 | return -1; | |
8677de2b RPM |
127 | } |
128 | ||
129 | if (ifname[0] != '\0') { | |
130 | /* User requested the interface to have a specific name */ | |
131 | s = socket(AF_LOCAL, SOCK_DGRAM, 0); | |
132 | if (s < 0) { | |
4bce487e MA |
133 | error_setg_errno(errp, errno, |
134 | "could not open socket to set interface name"); | |
bd54a9f9 EM |
135 | close(fd); |
136 | return -1; | |
8677de2b RPM |
137 | } |
138 | ifr.ifr_data = ifname; | |
139 | ret = ioctl(s, SIOCSIFNAME, (void *)&ifr); | |
140 | close(s); | |
141 | if (ret < 0) { | |
4bce487e | 142 | error_setg(errp, "could not set tap interface name"); |
bd54a9f9 EM |
143 | close(fd); |
144 | return -1; | |
8677de2b RPM |
145 | } |
146 | } else { | |
147 | pstrcpy(ifname, ifname_size, ifr.ifr_name); | |
148 | } | |
149 | ||
bd54a9f9 EM |
150 | return fd; |
151 | } | |
152 | ||
153 | int tap_open(char *ifname, int ifname_size, int *vnet_hdr, | |
154 | int vnet_hdr_required, int mq_required, Error **errp) | |
155 | { | |
156 | int fd = -1; | |
157 | ||
158 | /* If the specified tap device already exists just use it. */ | |
159 | if (ifname[0] != '\0') { | |
160 | char dname[100]; | |
161 | snprintf(dname, sizeof dname, "/dev/%s", ifname); | |
8b6aa693 | 162 | fd = RETRY_ON_EINTR(open(dname, O_RDWR)); |
bd54a9f9 EM |
163 | if (fd < 0 && errno != ENOENT) { |
164 | error_setg_errno(errp, errno, "could not open %s", dname); | |
165 | return -1; | |
166 | } | |
167 | } | |
168 | ||
169 | if (fd < 0) { | |
170 | /* Tap device not specified or does not exist. */ | |
171 | if ((fd = tap_open_clone(ifname, ifname_size, errp)) < 0) { | |
172 | return -1; | |
173 | } | |
174 | } | |
175 | ||
8677de2b RPM |
176 | if (*vnet_hdr) { |
177 | /* BSD doesn't have IFF_VNET_HDR */ | |
178 | *vnet_hdr = 0; | |
179 | ||
180 | if (vnet_hdr_required && !*vnet_hdr) { | |
4bce487e MA |
181 | error_setg(errp, "vnet_hdr=1 requested, but no kernel " |
182 | "support for IFF_VNET_HDR available"); | |
8677de2b RPM |
183 | goto error; |
184 | } | |
185 | } | |
186 | if (mq_required) { | |
4bce487e MA |
187 | error_setg(errp, "mq_required requested, but no kernel support" |
188 | " for IFF_MULTI_QUEUE available"); | |
8677de2b RPM |
189 | goto error; |
190 | } | |
191 | ||
22e135fc | 192 | g_unix_set_fd_nonblocking(fd, true, NULL); |
8677de2b RPM |
193 | return fd; |
194 | ||
195 | error: | |
196 | close(fd); | |
197 | return -1; | |
198 | } | |
199 | #endif /* __FreeBSD__ */ | |
200 | ||
80b832c3 | 201 | void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp) |
15ac913b | 202 | { |
15ac913b | 203 | } |
dc69004c | 204 | |
e7b347d0 | 205 | int tap_probe_vnet_hdr(int fd, Error **errp) |
dc69004c MM |
206 | { |
207 | return 0; | |
208 | } | |
1faac1f7 | 209 | |
9c282718 MM |
210 | int tap_probe_has_ufo(int fd) |
211 | { | |
212 | return 0; | |
213 | } | |
214 | ||
f03e0cf6 YB |
215 | int tap_probe_has_uso(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 | 239 | void tap_fd_set_offload(int fd, int csum, int tso4, |
2ab0ec31 | 240 | int tso6, int ecn, int ufo, int uso4, int uso6) |
1faac1f7 MM |
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 | } | |
8f364e34 AM |
258 | |
259 | int tap_fd_set_steering_ebpf(int fd, int prog_fd) | |
260 | { | |
261 | return -1; | |
262 | } |