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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 | ||
1422e32d | 25 | #include "tap_int.h" |
71f4effc | 26 | #include "qemu-common.h" |
9c17d615 | 27 | #include "sysemu/sysemu.h" |
1de7afc9 | 28 | #include "qemu/error-report.h" |
e7e92325 | 29 | |
8677de2b | 30 | #if defined(__NetBSD__) || defined(__FreeBSD__) |
45c245bf MB |
31 | #include <sys/ioctl.h> |
32 | #include <net/if.h> | |
e7e92325 MM |
33 | #include <net/if_tap.h> |
34 | #endif | |
35 | ||
8677de2b | 36 | #ifndef __FreeBSD__ |
264986e2 | 37 | int tap_open(char *ifname, int ifname_size, int *vnet_hdr, |
468dd824 | 38 | int vnet_hdr_required, int mq_required, Error **errp) |
e7e92325 | 39 | { |
468dd824 | 40 | /* FIXME error_setg(errp, ...) on failure */ |
e7e92325 | 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 { | |
5f668643 BS |
57 | #if defined(__OpenBSD__) |
58 | snprintf(dname, sizeof dname, "/dev/tun%d", i); | |
59 | #else | |
2f859a3c | 60 | snprintf(dname, sizeof dname, "/dev/tap%d", i); |
5f668643 | 61 | #endif |
2f859a3c JL |
62 | } |
63 | TFR(fd = open(dname, O_RDWR)); | |
64 | if (fd >= 0) { | |
65 | break; | |
66 | } | |
67 | else if (errno == ENXIO || errno == ENOENT) { | |
68 | break; | |
69 | } | |
70 | if (*ifname) { | |
71 | break; | |
72 | } | |
73 | } | |
74 | if (fd < 0) { | |
1ecda02b MA |
75 | error_report("warning: could not open %s (%s): no virtual network emulation", |
76 | dname, strerror(errno)); | |
2f859a3c JL |
77 | return -1; |
78 | } | |
e7e92325 | 79 | |
45c245bf MB |
80 | #ifdef TAPGIFNAME |
81 | if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) { | |
82 | fprintf(stderr, "warning: could not get tap name: %s\n", | |
83 | strerror(errno)); | |
84 | return -1; | |
85 | } | |
86 | pstrcpy(ifname, ifname_size, ifr.ifr_name); | |
87 | #else | |
88 | if (fstat(fd, &s) < 0) { | |
89 | fprintf(stderr, | |
90 | "warning: could not stat /dev/tap: no virtual network emulation: %s\n", | |
91 | strerror(errno)); | |
92 | return -1; | |
93 | } | |
e7e92325 MM |
94 | dev = devname(s.st_rdev, S_IFCHR); |
95 | pstrcpy(ifname, ifname_size, dev); | |
45c245bf | 96 | #endif |
e7e92325 | 97 | |
39ca4c08 JL |
98 | if (*vnet_hdr) { |
99 | /* BSD doesn't have IFF_VNET_HDR */ | |
100 | *vnet_hdr = 0; | |
101 | ||
102 | if (vnet_hdr_required && !*vnet_hdr) { | |
1ecda02b MA |
103 | error_report("vnet_hdr=1 requested, but no kernel " |
104 | "support for IFF_VNET_HDR available"); | |
39ca4c08 JL |
105 | close(fd); |
106 | return -1; | |
107 | } | |
108 | } | |
e7e92325 MM |
109 | fcntl(fd, F_SETFL, O_NONBLOCK); |
110 | return fd; | |
111 | } | |
15ac913b | 112 | |
8677de2b RPM |
113 | #else /* __FreeBSD__ */ |
114 | ||
115 | #define PATH_NET_TAP "/dev/tap" | |
116 | ||
117 | int tap_open(char *ifname, int ifname_size, int *vnet_hdr, | |
468dd824 | 118 | int vnet_hdr_required, int mq_required, Error **errp) |
8677de2b | 119 | { |
468dd824 | 120 | /* FIXME error_setg(errp, ...) on failure */ |
8677de2b RPM |
121 | int fd, s, ret; |
122 | struct ifreq ifr; | |
123 | ||
124 | TFR(fd = open(PATH_NET_TAP, O_RDWR)); | |
125 | if (fd < 0) { | |
126 | error_report("could not open %s: %s", PATH_NET_TAP, strerror(errno)); | |
127 | return -1; | |
128 | } | |
129 | ||
130 | memset(&ifr, 0, sizeof(ifr)); | |
131 | ||
132 | ret = ioctl(fd, TAPGIFNAME, (void *)&ifr); | |
133 | if (ret < 0) { | |
134 | error_report("could not get tap interface name"); | |
135 | goto error; | |
136 | } | |
137 | ||
138 | if (ifname[0] != '\0') { | |
139 | /* User requested the interface to have a specific name */ | |
140 | s = socket(AF_LOCAL, SOCK_DGRAM, 0); | |
141 | if (s < 0) { | |
142 | error_report("could not open socket to set interface name"); | |
143 | goto error; | |
144 | } | |
145 | ifr.ifr_data = ifname; | |
146 | ret = ioctl(s, SIOCSIFNAME, (void *)&ifr); | |
147 | close(s); | |
148 | if (ret < 0) { | |
149 | error_report("could not set tap interface name"); | |
150 | goto error; | |
151 | } | |
152 | } else { | |
153 | pstrcpy(ifname, ifname_size, ifr.ifr_name); | |
154 | } | |
155 | ||
156 | if (*vnet_hdr) { | |
157 | /* BSD doesn't have IFF_VNET_HDR */ | |
158 | *vnet_hdr = 0; | |
159 | ||
160 | if (vnet_hdr_required && !*vnet_hdr) { | |
161 | error_report("vnet_hdr=1 requested, but no kernel " | |
162 | "support for IFF_VNET_HDR available"); | |
163 | goto error; | |
164 | } | |
165 | } | |
166 | if (mq_required) { | |
167 | error_report("mq_required requested, but not kernel support" | |
168 | "for IFF_MULTI_QUEUE available"); | |
169 | goto error; | |
170 | } | |
171 | ||
172 | fcntl(fd, F_SETFL, O_NONBLOCK); | |
173 | return fd; | |
174 | ||
175 | error: | |
176 | close(fd); | |
177 | return -1; | |
178 | } | |
179 | #endif /* __FreeBSD__ */ | |
180 | ||
80b832c3 | 181 | void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp) |
15ac913b | 182 | { |
15ac913b | 183 | } |
dc69004c MM |
184 | |
185 | int tap_probe_vnet_hdr(int fd) | |
186 | { | |
187 | return 0; | |
188 | } | |
1faac1f7 | 189 | |
9c282718 MM |
190 | int tap_probe_has_ufo(int fd) |
191 | { | |
192 | return 0; | |
193 | } | |
194 | ||
445d892f MT |
195 | int tap_probe_vnet_hdr_len(int fd, int len) |
196 | { | |
197 | return 0; | |
198 | } | |
199 | ||
200 | void tap_fd_set_vnet_hdr_len(int fd, int len) | |
201 | { | |
202 | } | |
203 | ||
1faac1f7 MM |
204 | void tap_fd_set_offload(int fd, int csum, int tso4, |
205 | int tso6, int ecn, int ufo) | |
206 | { | |
207 | } | |
94fdc6d0 JW |
208 | |
209 | int tap_fd_enable(int fd) | |
210 | { | |
211 | return -1; | |
212 | } | |
213 | ||
214 | int tap_fd_disable(int fd) | |
215 | { | |
216 | return -1; | |
217 | } | |
218 | ||
e5dc0b40 JW |
219 | int tap_fd_get_ifname(int fd, char *ifname) |
220 | { | |
221 | return -1; | |
222 | } |