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1 | 5281d757 | Mark McLoughlin | /*
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2 | 5281d757 | Mark McLoughlin | * QEMU System Emulator
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3 | 5281d757 | Mark McLoughlin | *
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4 | 5281d757 | Mark McLoughlin | * Copyright (c) 2003-2008 Fabrice Bellard
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5 | 5281d757 | Mark McLoughlin | * Copyright (c) 2009 Red Hat, Inc.
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6 | 5281d757 | Mark McLoughlin | *
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7 | 5281d757 | Mark McLoughlin | * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 | 5281d757 | Mark McLoughlin | * of this software and associated documentation files (the "Software"), to deal
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9 | 5281d757 | Mark McLoughlin | * in the Software without restriction, including without limitation the rights
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10 | 5281d757 | Mark McLoughlin | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 | 5281d757 | Mark McLoughlin | * copies of the Software, and to permit persons to whom the Software is
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12 | 5281d757 | Mark McLoughlin | * furnished to do so, subject to the following conditions:
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13 | 5281d757 | Mark McLoughlin | *
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14 | 5281d757 | Mark McLoughlin | * The above copyright notice and this permission notice shall be included in
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15 | 5281d757 | Mark McLoughlin | * all copies or substantial portions of the Software.
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16 | 5281d757 | Mark McLoughlin | *
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17 | 5281d757 | Mark McLoughlin | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 | 5281d757 | Mark McLoughlin | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 | 5281d757 | Mark McLoughlin | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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20 | 5281d757 | Mark McLoughlin | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 | 5281d757 | Mark McLoughlin | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 | 5281d757 | Mark McLoughlin | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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23 | 5281d757 | Mark McLoughlin | * THE SOFTWARE.
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24 | 5281d757 | Mark McLoughlin | */
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25 | 5281d757 | Mark McLoughlin | |
26 | 5281d757 | Mark McLoughlin | #include "net/tap.h" |
27 | 5281d757 | Mark McLoughlin | |
28 | 5281d757 | Mark McLoughlin | #include "config-host.h" |
29 | 5281d757 | Mark McLoughlin | |
30 | 5281d757 | Mark McLoughlin | #include <signal.h> |
31 | 5281d757 | Mark McLoughlin | #include <sys/ioctl.h> |
32 | 5281d757 | Mark McLoughlin | #include <sys/stat.h> |
33 | 5281d757 | Mark McLoughlin | #include <sys/wait.h> |
34 | 71f4effc | Alexander Graf | #include <sys/socket.h> |
35 | 5281d757 | Mark McLoughlin | #include <net/if.h> |
36 | 5281d757 | Mark McLoughlin | |
37 | 5281d757 | Mark McLoughlin | #include "net.h" |
38 | 5281d757 | Mark McLoughlin | #include "sysemu.h" |
39 | 5281d757 | Mark McLoughlin | #include "qemu-char.h" |
40 | 5281d757 | Mark McLoughlin | #include "qemu-common.h" |
41 | 2f792016 | Markus Armbruster | #include "qemu-error.h" |
42 | 5281d757 | Mark McLoughlin | |
43 | 5281d757 | Mark McLoughlin | #include "net/tap-linux.h" |
44 | 5281d757 | Mark McLoughlin | |
45 | 5281d757 | Mark McLoughlin | /* Maximum GSO packet size (64k) plus plenty of room for
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46 | 5281d757 | Mark McLoughlin | * the ethernet and virtio_net headers
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47 | 5281d757 | Mark McLoughlin | */
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48 | 5281d757 | Mark McLoughlin | #define TAP_BUFSIZE (4096 + 65536) |
49 | 5281d757 | Mark McLoughlin | |
50 | 5281d757 | Mark McLoughlin | typedef struct TAPState { |
51 | 3e35ba93 | Mark McLoughlin | VLANClientState nc; |
52 | 5281d757 | Mark McLoughlin | int fd;
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53 | 5281d757 | Mark McLoughlin | char down_script[1024]; |
54 | 5281d757 | Mark McLoughlin | char down_script_arg[128]; |
55 | 5281d757 | Mark McLoughlin | uint8_t buf[TAP_BUFSIZE]; |
56 | 5281d757 | Mark McLoughlin | unsigned int read_poll : 1; |
57 | 5281d757 | Mark McLoughlin | unsigned int write_poll : 1; |
58 | 5281d757 | Mark McLoughlin | unsigned int has_vnet_hdr : 1; |
59 | 5281d757 | Mark McLoughlin | unsigned int using_vnet_hdr : 1; |
60 | 5281d757 | Mark McLoughlin | unsigned int has_ufo: 1; |
61 | 5281d757 | Mark McLoughlin | } TAPState; |
62 | 5281d757 | Mark McLoughlin | |
63 | 5281d757 | Mark McLoughlin | static int launch_script(const char *setup_script, const char *ifname, int fd); |
64 | 5281d757 | Mark McLoughlin | |
65 | 5281d757 | Mark McLoughlin | static int tap_can_send(void *opaque); |
66 | 5281d757 | Mark McLoughlin | static void tap_send(void *opaque); |
67 | 5281d757 | Mark McLoughlin | static void tap_writable(void *opaque); |
68 | 5281d757 | Mark McLoughlin | |
69 | 5281d757 | Mark McLoughlin | static void tap_update_fd_handler(TAPState *s) |
70 | 5281d757 | Mark McLoughlin | { |
71 | 5281d757 | Mark McLoughlin | qemu_set_fd_handler2(s->fd, |
72 | 5281d757 | Mark McLoughlin | s->read_poll ? tap_can_send : NULL,
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73 | 5281d757 | Mark McLoughlin | s->read_poll ? tap_send : NULL,
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74 | 5281d757 | Mark McLoughlin | s->write_poll ? tap_writable : NULL,
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75 | 5281d757 | Mark McLoughlin | s); |
76 | 5281d757 | Mark McLoughlin | } |
77 | 5281d757 | Mark McLoughlin | |
78 | 5281d757 | Mark McLoughlin | static void tap_read_poll(TAPState *s, int enable) |
79 | 5281d757 | Mark McLoughlin | { |
80 | 5281d757 | Mark McLoughlin | s->read_poll = !!enable; |
81 | 5281d757 | Mark McLoughlin | tap_update_fd_handler(s); |
82 | 5281d757 | Mark McLoughlin | } |
83 | 5281d757 | Mark McLoughlin | |
84 | 5281d757 | Mark McLoughlin | static void tap_write_poll(TAPState *s, int enable) |
85 | 5281d757 | Mark McLoughlin | { |
86 | 5281d757 | Mark McLoughlin | s->write_poll = !!enable; |
87 | 5281d757 | Mark McLoughlin | tap_update_fd_handler(s); |
88 | 5281d757 | Mark McLoughlin | } |
89 | 5281d757 | Mark McLoughlin | |
90 | 5281d757 | Mark McLoughlin | static void tap_writable(void *opaque) |
91 | 5281d757 | Mark McLoughlin | { |
92 | 5281d757 | Mark McLoughlin | TAPState *s = opaque; |
93 | 5281d757 | Mark McLoughlin | |
94 | 5281d757 | Mark McLoughlin | tap_write_poll(s, 0);
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95 | 5281d757 | Mark McLoughlin | |
96 | 3e35ba93 | Mark McLoughlin | qemu_flush_queued_packets(&s->nc); |
97 | 5281d757 | Mark McLoughlin | } |
98 | 5281d757 | Mark McLoughlin | |
99 | 5281d757 | Mark McLoughlin | static ssize_t tap_write_packet(TAPState *s, const struct iovec *iov, int iovcnt) |
100 | 5281d757 | Mark McLoughlin | { |
101 | 5281d757 | Mark McLoughlin | ssize_t len; |
102 | 5281d757 | Mark McLoughlin | |
103 | 5281d757 | Mark McLoughlin | do {
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104 | 5281d757 | Mark McLoughlin | len = writev(s->fd, iov, iovcnt); |
105 | 5281d757 | Mark McLoughlin | } while (len == -1 && errno == EINTR); |
106 | 5281d757 | Mark McLoughlin | |
107 | 5281d757 | Mark McLoughlin | if (len == -1 && errno == EAGAIN) { |
108 | 5281d757 | Mark McLoughlin | tap_write_poll(s, 1);
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109 | 5281d757 | Mark McLoughlin | return 0; |
110 | 5281d757 | Mark McLoughlin | } |
111 | 5281d757 | Mark McLoughlin | |
112 | 5281d757 | Mark McLoughlin | return len;
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113 | 5281d757 | Mark McLoughlin | } |
114 | 5281d757 | Mark McLoughlin | |
115 | 3e35ba93 | Mark McLoughlin | static ssize_t tap_receive_iov(VLANClientState *nc, const struct iovec *iov, |
116 | 5281d757 | Mark McLoughlin | int iovcnt)
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117 | 5281d757 | Mark McLoughlin | { |
118 | 3e35ba93 | Mark McLoughlin | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
119 | 5281d757 | Mark McLoughlin | const struct iovec *iovp = iov; |
120 | 5281d757 | Mark McLoughlin | struct iovec iov_copy[iovcnt + 1]; |
121 | 5281d757 | Mark McLoughlin | struct virtio_net_hdr hdr = { 0, }; |
122 | 5281d757 | Mark McLoughlin | |
123 | 5281d757 | Mark McLoughlin | if (s->has_vnet_hdr && !s->using_vnet_hdr) {
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124 | 5281d757 | Mark McLoughlin | iov_copy[0].iov_base = &hdr;
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125 | 5281d757 | Mark McLoughlin | iov_copy[0].iov_len = sizeof(hdr); |
126 | 5281d757 | Mark McLoughlin | memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov)); |
127 | 5281d757 | Mark McLoughlin | iovp = iov_copy; |
128 | 5281d757 | Mark McLoughlin | iovcnt++; |
129 | 5281d757 | Mark McLoughlin | } |
130 | 5281d757 | Mark McLoughlin | |
131 | 5281d757 | Mark McLoughlin | return tap_write_packet(s, iovp, iovcnt);
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132 | 5281d757 | Mark McLoughlin | } |
133 | 5281d757 | Mark McLoughlin | |
134 | 3e35ba93 | Mark McLoughlin | static ssize_t tap_receive_raw(VLANClientState *nc, const uint8_t *buf, size_t size) |
135 | 5281d757 | Mark McLoughlin | { |
136 | 3e35ba93 | Mark McLoughlin | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
137 | 5281d757 | Mark McLoughlin | struct iovec iov[2]; |
138 | 5281d757 | Mark McLoughlin | int iovcnt = 0; |
139 | 5281d757 | Mark McLoughlin | struct virtio_net_hdr hdr = { 0, }; |
140 | 5281d757 | Mark McLoughlin | |
141 | 5281d757 | Mark McLoughlin | if (s->has_vnet_hdr) {
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142 | 5281d757 | Mark McLoughlin | iov[iovcnt].iov_base = &hdr; |
143 | 5281d757 | Mark McLoughlin | iov[iovcnt].iov_len = sizeof(hdr);
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144 | 5281d757 | Mark McLoughlin | iovcnt++; |
145 | 5281d757 | Mark McLoughlin | } |
146 | 5281d757 | Mark McLoughlin | |
147 | 5281d757 | Mark McLoughlin | iov[iovcnt].iov_base = (char *)buf;
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148 | 5281d757 | Mark McLoughlin | iov[iovcnt].iov_len = size; |
149 | 5281d757 | Mark McLoughlin | iovcnt++; |
150 | 5281d757 | Mark McLoughlin | |
151 | 5281d757 | Mark McLoughlin | return tap_write_packet(s, iov, iovcnt);
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152 | 5281d757 | Mark McLoughlin | } |
153 | 5281d757 | Mark McLoughlin | |
154 | 3e35ba93 | Mark McLoughlin | static ssize_t tap_receive(VLANClientState *nc, const uint8_t *buf, size_t size) |
155 | 5281d757 | Mark McLoughlin | { |
156 | 3e35ba93 | Mark McLoughlin | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
157 | 5281d757 | Mark McLoughlin | struct iovec iov[1]; |
158 | 5281d757 | Mark McLoughlin | |
159 | 5281d757 | Mark McLoughlin | if (s->has_vnet_hdr && !s->using_vnet_hdr) {
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160 | 3e35ba93 | Mark McLoughlin | return tap_receive_raw(nc, buf, size);
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161 | 5281d757 | Mark McLoughlin | } |
162 | 5281d757 | Mark McLoughlin | |
163 | 5281d757 | Mark McLoughlin | iov[0].iov_base = (char *)buf; |
164 | 5281d757 | Mark McLoughlin | iov[0].iov_len = size;
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165 | 5281d757 | Mark McLoughlin | |
166 | 5281d757 | Mark McLoughlin | return tap_write_packet(s, iov, 1); |
167 | 5281d757 | Mark McLoughlin | } |
168 | 5281d757 | Mark McLoughlin | |
169 | 5281d757 | Mark McLoughlin | static int tap_can_send(void *opaque) |
170 | 5281d757 | Mark McLoughlin | { |
171 | 5281d757 | Mark McLoughlin | TAPState *s = opaque; |
172 | 5281d757 | Mark McLoughlin | |
173 | 3e35ba93 | Mark McLoughlin | return qemu_can_send_packet(&s->nc);
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174 | 5281d757 | Mark McLoughlin | } |
175 | 5281d757 | Mark McLoughlin | |
176 | 966ea5ec | Mark McLoughlin | #ifndef __sun__
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177 | 966ea5ec | Mark McLoughlin | ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen) |
178 | 5281d757 | Mark McLoughlin | { |
179 | 5281d757 | Mark McLoughlin | return read(tapfd, buf, maxlen);
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180 | 5281d757 | Mark McLoughlin | } |
181 | 5281d757 | Mark McLoughlin | #endif
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182 | 5281d757 | Mark McLoughlin | |
183 | 3e35ba93 | Mark McLoughlin | static void tap_send_completed(VLANClientState *nc, ssize_t len) |
184 | 5281d757 | Mark McLoughlin | { |
185 | 3e35ba93 | Mark McLoughlin | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
186 | 5281d757 | Mark McLoughlin | tap_read_poll(s, 1);
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187 | 5281d757 | Mark McLoughlin | } |
188 | 5281d757 | Mark McLoughlin | |
189 | 5281d757 | Mark McLoughlin | static void tap_send(void *opaque) |
190 | 5281d757 | Mark McLoughlin | { |
191 | 5281d757 | Mark McLoughlin | TAPState *s = opaque; |
192 | 5281d757 | Mark McLoughlin | int size;
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193 | 5281d757 | Mark McLoughlin | |
194 | 5819c918 | Mark McLoughlin | do {
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195 | 5819c918 | Mark McLoughlin | uint8_t *buf = s->buf; |
196 | 5819c918 | Mark McLoughlin | |
197 | 5819c918 | Mark McLoughlin | size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
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198 | 5819c918 | Mark McLoughlin | if (size <= 0) { |
199 | 5819c918 | Mark McLoughlin | break;
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200 | 5819c918 | Mark McLoughlin | } |
201 | 5819c918 | Mark McLoughlin | |
202 | 5819c918 | Mark McLoughlin | if (s->has_vnet_hdr && !s->using_vnet_hdr) {
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203 | 5819c918 | Mark McLoughlin | buf += sizeof(struct virtio_net_hdr); |
204 | 5819c918 | Mark McLoughlin | size -= sizeof(struct virtio_net_hdr); |
205 | 5819c918 | Mark McLoughlin | } |
206 | 5819c918 | Mark McLoughlin | |
207 | 3e35ba93 | Mark McLoughlin | size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed); |
208 | 5819c918 | Mark McLoughlin | if (size == 0) { |
209 | 5819c918 | Mark McLoughlin | tap_read_poll(s, 0);
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210 | 5819c918 | Mark McLoughlin | } |
211 | 3e35ba93 | Mark McLoughlin | } while (size > 0 && qemu_can_send_packet(&s->nc)); |
212 | 5281d757 | Mark McLoughlin | } |
213 | 5281d757 | Mark McLoughlin | |
214 | 3e35ba93 | Mark McLoughlin | int tap_has_ufo(VLANClientState *nc)
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215 | 5281d757 | Mark McLoughlin | { |
216 | 3e35ba93 | Mark McLoughlin | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
217 | 5281d757 | Mark McLoughlin | |
218 | 665a3b07 | Mark McLoughlin | assert(nc->info->type == NET_CLIENT_TYPE_TAP); |
219 | 5281d757 | Mark McLoughlin | |
220 | 5281d757 | Mark McLoughlin | return s->has_ufo;
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221 | 5281d757 | Mark McLoughlin | } |
222 | 5281d757 | Mark McLoughlin | |
223 | 3e35ba93 | Mark McLoughlin | int tap_has_vnet_hdr(VLANClientState *nc)
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224 | 5281d757 | Mark McLoughlin | { |
225 | 3e35ba93 | Mark McLoughlin | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
226 | 5281d757 | Mark McLoughlin | |
227 | 665a3b07 | Mark McLoughlin | assert(nc->info->type == NET_CLIENT_TYPE_TAP); |
228 | 5281d757 | Mark McLoughlin | |
229 | 5281d757 | Mark McLoughlin | return s->has_vnet_hdr;
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230 | 5281d757 | Mark McLoughlin | } |
231 | 5281d757 | Mark McLoughlin | |
232 | 3e35ba93 | Mark McLoughlin | void tap_using_vnet_hdr(VLANClientState *nc, int using_vnet_hdr) |
233 | 5281d757 | Mark McLoughlin | { |
234 | 3e35ba93 | Mark McLoughlin | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
235 | 5281d757 | Mark McLoughlin | |
236 | 5281d757 | Mark McLoughlin | using_vnet_hdr = using_vnet_hdr != 0;
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237 | 5281d757 | Mark McLoughlin | |
238 | 665a3b07 | Mark McLoughlin | assert(nc->info->type == NET_CLIENT_TYPE_TAP); |
239 | 5281d757 | Mark McLoughlin | assert(s->has_vnet_hdr == using_vnet_hdr); |
240 | 5281d757 | Mark McLoughlin | |
241 | 5281d757 | Mark McLoughlin | s->using_vnet_hdr = using_vnet_hdr; |
242 | 5281d757 | Mark McLoughlin | } |
243 | 5281d757 | Mark McLoughlin | |
244 | 3e35ba93 | Mark McLoughlin | void tap_set_offload(VLANClientState *nc, int csum, int tso4, |
245 | 5281d757 | Mark McLoughlin | int tso6, int ecn, int ufo) |
246 | 5281d757 | Mark McLoughlin | { |
247 | 3e35ba93 | Mark McLoughlin | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
248 | 5281d757 | Mark McLoughlin | |
249 | 1faac1f7 | Mark McLoughlin | return tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo);
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250 | 5281d757 | Mark McLoughlin | } |
251 | 5281d757 | Mark McLoughlin | |
252 | 3e35ba93 | Mark McLoughlin | static void tap_cleanup(VLANClientState *nc) |
253 | 5281d757 | Mark McLoughlin | { |
254 | 3e35ba93 | Mark McLoughlin | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
255 | 5281d757 | Mark McLoughlin | |
256 | 3e35ba93 | Mark McLoughlin | qemu_purge_queued_packets(nc); |
257 | 5281d757 | Mark McLoughlin | |
258 | 5281d757 | Mark McLoughlin | if (s->down_script[0]) |
259 | 5281d757 | Mark McLoughlin | launch_script(s->down_script, s->down_script_arg, s->fd); |
260 | 5281d757 | Mark McLoughlin | |
261 | 5281d757 | Mark McLoughlin | tap_read_poll(s, 0);
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262 | 5281d757 | Mark McLoughlin | tap_write_poll(s, 0);
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263 | 5281d757 | Mark McLoughlin | close(s->fd); |
264 | 5281d757 | Mark McLoughlin | } |
265 | 5281d757 | Mark McLoughlin | |
266 | ceb69615 | Michael S. Tsirkin | static void tap_poll(VLANClientState *nc, bool enable) |
267 | ceb69615 | Michael S. Tsirkin | { |
268 | ceb69615 | Michael S. Tsirkin | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
269 | ceb69615 | Michael S. Tsirkin | tap_read_poll(s, enable); |
270 | ceb69615 | Michael S. Tsirkin | tap_write_poll(s, enable); |
271 | ceb69615 | Michael S. Tsirkin | } |
272 | ceb69615 | Michael S. Tsirkin | |
273 | 5281d757 | Mark McLoughlin | /* fd support */
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274 | 5281d757 | Mark McLoughlin | |
275 | 3e35ba93 | Mark McLoughlin | static NetClientInfo net_tap_info = {
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276 | 3e35ba93 | Mark McLoughlin | .type = NET_CLIENT_TYPE_TAP, |
277 | 3e35ba93 | Mark McLoughlin | .size = sizeof(TAPState),
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278 | 3e35ba93 | Mark McLoughlin | .receive = tap_receive, |
279 | 3e35ba93 | Mark McLoughlin | .receive_raw = tap_receive_raw, |
280 | 3e35ba93 | Mark McLoughlin | .receive_iov = tap_receive_iov, |
281 | ceb69615 | Michael S. Tsirkin | .poll = tap_poll, |
282 | 3e35ba93 | Mark McLoughlin | .cleanup = tap_cleanup, |
283 | 3e35ba93 | Mark McLoughlin | }; |
284 | 3e35ba93 | Mark McLoughlin | |
285 | 5281d757 | Mark McLoughlin | static TAPState *net_tap_fd_init(VLANState *vlan,
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286 | 5281d757 | Mark McLoughlin | const char *model, |
287 | 5281d757 | Mark McLoughlin | const char *name, |
288 | 5281d757 | Mark McLoughlin | int fd,
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289 | 5281d757 | Mark McLoughlin | int vnet_hdr)
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290 | 5281d757 | Mark McLoughlin | { |
291 | 3e35ba93 | Mark McLoughlin | VLANClientState *nc; |
292 | 5281d757 | Mark McLoughlin | TAPState *s; |
293 | 5281d757 | Mark McLoughlin | |
294 | 3e35ba93 | Mark McLoughlin | nc = qemu_new_net_client(&net_tap_info, vlan, NULL, model, name);
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295 | 3e35ba93 | Mark McLoughlin | |
296 | 3e35ba93 | Mark McLoughlin | s = DO_UPCAST(TAPState, nc, nc); |
297 | 3e35ba93 | Mark McLoughlin | |
298 | 5281d757 | Mark McLoughlin | s->fd = fd; |
299 | 5281d757 | Mark McLoughlin | s->has_vnet_hdr = vnet_hdr != 0;
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300 | 5281d757 | Mark McLoughlin | s->using_vnet_hdr = 0;
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301 | 9c282718 | Mark McLoughlin | s->has_ufo = tap_probe_has_ufo(s->fd); |
302 | 3e35ba93 | Mark McLoughlin | tap_set_offload(&s->nc, 0, 0, 0, 0, 0); |
303 | 5281d757 | Mark McLoughlin | tap_read_poll(s, 1);
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304 | 5281d757 | Mark McLoughlin | return s;
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305 | 5281d757 | Mark McLoughlin | } |
306 | 5281d757 | Mark McLoughlin | |
307 | 5281d757 | Mark McLoughlin | static int launch_script(const char *setup_script, const char *ifname, int fd) |
308 | 5281d757 | Mark McLoughlin | { |
309 | 5281d757 | Mark McLoughlin | sigset_t oldmask, mask; |
310 | 5281d757 | Mark McLoughlin | int pid, status;
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311 | 5281d757 | Mark McLoughlin | char *args[3]; |
312 | 5281d757 | Mark McLoughlin | char **parg;
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313 | 5281d757 | Mark McLoughlin | |
314 | 5281d757 | Mark McLoughlin | sigemptyset(&mask); |
315 | 5281d757 | Mark McLoughlin | sigaddset(&mask, SIGCHLD); |
316 | 5281d757 | Mark McLoughlin | sigprocmask(SIG_BLOCK, &mask, &oldmask); |
317 | 5281d757 | Mark McLoughlin | |
318 | 5281d757 | Mark McLoughlin | /* try to launch network script */
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319 | 5281d757 | Mark McLoughlin | pid = fork(); |
320 | 5281d757 | Mark McLoughlin | if (pid == 0) { |
321 | 5281d757 | Mark McLoughlin | int open_max = sysconf(_SC_OPEN_MAX), i;
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322 | 5281d757 | Mark McLoughlin | |
323 | 5281d757 | Mark McLoughlin | for (i = 0; i < open_max; i++) { |
324 | 5281d757 | Mark McLoughlin | if (i != STDIN_FILENO &&
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325 | 5281d757 | Mark McLoughlin | i != STDOUT_FILENO && |
326 | 5281d757 | Mark McLoughlin | i != STDERR_FILENO && |
327 | 5281d757 | Mark McLoughlin | i != fd) { |
328 | 5281d757 | Mark McLoughlin | close(i); |
329 | 5281d757 | Mark McLoughlin | } |
330 | 5281d757 | Mark McLoughlin | } |
331 | 5281d757 | Mark McLoughlin | parg = args; |
332 | 5281d757 | Mark McLoughlin | *parg++ = (char *)setup_script;
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333 | 5281d757 | Mark McLoughlin | *parg++ = (char *)ifname;
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334 | 5281d757 | Mark McLoughlin | *parg++ = NULL;
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335 | 5281d757 | Mark McLoughlin | execv(setup_script, args); |
336 | 5281d757 | Mark McLoughlin | _exit(1);
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337 | 5281d757 | Mark McLoughlin | } else if (pid > 0) { |
338 | 5281d757 | Mark McLoughlin | while (waitpid(pid, &status, 0) != pid) { |
339 | 5281d757 | Mark McLoughlin | /* loop */
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340 | 5281d757 | Mark McLoughlin | } |
341 | 5281d757 | Mark McLoughlin | sigprocmask(SIG_SETMASK, &oldmask, NULL);
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342 | 5281d757 | Mark McLoughlin | |
343 | 5281d757 | Mark McLoughlin | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { |
344 | 5281d757 | Mark McLoughlin | return 0; |
345 | 5281d757 | Mark McLoughlin | } |
346 | 5281d757 | Mark McLoughlin | } |
347 | 5281d757 | Mark McLoughlin | fprintf(stderr, "%s: could not launch network script\n", setup_script);
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348 | 5281d757 | Mark McLoughlin | return -1; |
349 | 5281d757 | Mark McLoughlin | } |
350 | 5281d757 | Mark McLoughlin | |
351 | 5281d757 | Mark McLoughlin | static int net_tap_init(QemuOpts *opts, int *vnet_hdr) |
352 | 5281d757 | Mark McLoughlin | { |
353 | 5281d757 | Mark McLoughlin | int fd, vnet_hdr_required;
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354 | 5281d757 | Mark McLoughlin | char ifname[128] = {0,}; |
355 | 5281d757 | Mark McLoughlin | const char *setup_script; |
356 | 5281d757 | Mark McLoughlin | |
357 | 5281d757 | Mark McLoughlin | if (qemu_opt_get(opts, "ifname")) { |
358 | 5281d757 | Mark McLoughlin | pstrcpy(ifname, sizeof(ifname), qemu_opt_get(opts, "ifname")); |
359 | 5281d757 | Mark McLoughlin | } |
360 | 5281d757 | Mark McLoughlin | |
361 | 5281d757 | Mark McLoughlin | *vnet_hdr = qemu_opt_get_bool(opts, "vnet_hdr", 1); |
362 | 5281d757 | Mark McLoughlin | if (qemu_opt_get(opts, "vnet_hdr")) { |
363 | 5281d757 | Mark McLoughlin | vnet_hdr_required = *vnet_hdr; |
364 | 5281d757 | Mark McLoughlin | } else {
|
365 | 5281d757 | Mark McLoughlin | vnet_hdr_required = 0;
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366 | 5281d757 | Mark McLoughlin | } |
367 | 5281d757 | Mark McLoughlin | |
368 | 5281d757 | Mark McLoughlin | TFR(fd = tap_open(ifname, sizeof(ifname), vnet_hdr, vnet_hdr_required));
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369 | 5281d757 | Mark McLoughlin | if (fd < 0) { |
370 | 5281d757 | Mark McLoughlin | return -1; |
371 | 5281d757 | Mark McLoughlin | } |
372 | 5281d757 | Mark McLoughlin | |
373 | 5281d757 | Mark McLoughlin | setup_script = qemu_opt_get(opts, "script");
|
374 | 5281d757 | Mark McLoughlin | if (setup_script &&
|
375 | 5281d757 | Mark McLoughlin | setup_script[0] != '\0' && |
376 | 5281d757 | Mark McLoughlin | strcmp(setup_script, "no") != 0 && |
377 | 5281d757 | Mark McLoughlin | launch_script(setup_script, ifname, fd)) { |
378 | 5281d757 | Mark McLoughlin | close(fd); |
379 | 5281d757 | Mark McLoughlin | return -1; |
380 | 5281d757 | Mark McLoughlin | } |
381 | 5281d757 | Mark McLoughlin | |
382 | 5281d757 | Mark McLoughlin | qemu_opt_set(opts, "ifname", ifname);
|
383 | 5281d757 | Mark McLoughlin | |
384 | 5281d757 | Mark McLoughlin | return fd;
|
385 | 5281d757 | Mark McLoughlin | } |
386 | 5281d757 | Mark McLoughlin | |
387 | 5281d757 | Mark McLoughlin | int net_init_tap(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan) |
388 | 5281d757 | Mark McLoughlin | { |
389 | 5281d757 | Mark McLoughlin | TAPState *s; |
390 | df6c2a0f | Mark McLoughlin | int fd, vnet_hdr = 0; |
391 | 5281d757 | Mark McLoughlin | |
392 | 5281d757 | Mark McLoughlin | if (qemu_opt_get(opts, "fd")) { |
393 | 5281d757 | Mark McLoughlin | if (qemu_opt_get(opts, "ifname") || |
394 | 5281d757 | Mark McLoughlin | qemu_opt_get(opts, "script") ||
|
395 | 5281d757 | Mark McLoughlin | qemu_opt_get(opts, "downscript") ||
|
396 | 5281d757 | Mark McLoughlin | qemu_opt_get(opts, "vnet_hdr")) {
|
397 | 5281d757 | Mark McLoughlin | qemu_error("ifname=, script=, downscript= and vnet_hdr= is invalid with fd=\n");
|
398 | 5281d757 | Mark McLoughlin | return -1; |
399 | 5281d757 | Mark McLoughlin | } |
400 | 5281d757 | Mark McLoughlin | |
401 | 5281d757 | Mark McLoughlin | fd = net_handle_fd_param(mon, qemu_opt_get(opts, "fd"));
|
402 | 5281d757 | Mark McLoughlin | if (fd == -1) { |
403 | 5281d757 | Mark McLoughlin | return -1; |
404 | 5281d757 | Mark McLoughlin | } |
405 | 5281d757 | Mark McLoughlin | |
406 | 5281d757 | Mark McLoughlin | fcntl(fd, F_SETFL, O_NONBLOCK); |
407 | 5281d757 | Mark McLoughlin | |
408 | 5281d757 | Mark McLoughlin | vnet_hdr = tap_probe_vnet_hdr(fd); |
409 | 5281d757 | Mark McLoughlin | } else {
|
410 | 5281d757 | Mark McLoughlin | if (!qemu_opt_get(opts, "script")) { |
411 | 5281d757 | Mark McLoughlin | qemu_opt_set(opts, "script", DEFAULT_NETWORK_SCRIPT);
|
412 | 5281d757 | Mark McLoughlin | } |
413 | 5281d757 | Mark McLoughlin | |
414 | 5281d757 | Mark McLoughlin | if (!qemu_opt_get(opts, "downscript")) { |
415 | 5281d757 | Mark McLoughlin | qemu_opt_set(opts, "downscript", DEFAULT_NETWORK_DOWN_SCRIPT);
|
416 | 5281d757 | Mark McLoughlin | } |
417 | 5281d757 | Mark McLoughlin | |
418 | 5281d757 | Mark McLoughlin | fd = net_tap_init(opts, &vnet_hdr); |
419 | 929fe497 | Juergen Lock | if (fd == -1) { |
420 | 929fe497 | Juergen Lock | return -1; |
421 | 929fe497 | Juergen Lock | } |
422 | 5281d757 | Mark McLoughlin | } |
423 | 5281d757 | Mark McLoughlin | |
424 | 5281d757 | Mark McLoughlin | s = net_tap_fd_init(vlan, "tap", name, fd, vnet_hdr);
|
425 | 5281d757 | Mark McLoughlin | if (!s) {
|
426 | 5281d757 | Mark McLoughlin | close(fd); |
427 | 5281d757 | Mark McLoughlin | return -1; |
428 | 5281d757 | Mark McLoughlin | } |
429 | 5281d757 | Mark McLoughlin | |
430 | 15ac913b | Mark McLoughlin | if (tap_set_sndbuf(s->fd, opts) < 0) { |
431 | 5281d757 | Mark McLoughlin | return -1; |
432 | 5281d757 | Mark McLoughlin | } |
433 | 5281d757 | Mark McLoughlin | |
434 | 5281d757 | Mark McLoughlin | if (qemu_opt_get(opts, "fd")) { |
435 | 3e35ba93 | Mark McLoughlin | snprintf(s->nc.info_str, sizeof(s->nc.info_str), "fd=%d", fd); |
436 | 5281d757 | Mark McLoughlin | } else {
|
437 | 5281d757 | Mark McLoughlin | const char *ifname, *script, *downscript; |
438 | 5281d757 | Mark McLoughlin | |
439 | 5281d757 | Mark McLoughlin | ifname = qemu_opt_get(opts, "ifname");
|
440 | 5281d757 | Mark McLoughlin | script = qemu_opt_get(opts, "script");
|
441 | 5281d757 | Mark McLoughlin | downscript = qemu_opt_get(opts, "downscript");
|
442 | 5281d757 | Mark McLoughlin | |
443 | 3e35ba93 | Mark McLoughlin | snprintf(s->nc.info_str, sizeof(s->nc.info_str),
|
444 | 5281d757 | Mark McLoughlin | "ifname=%s,script=%s,downscript=%s",
|
445 | 5281d757 | Mark McLoughlin | ifname, script, downscript); |
446 | 5281d757 | Mark McLoughlin | |
447 | 5281d757 | Mark McLoughlin | if (strcmp(downscript, "no") != 0) { |
448 | 5281d757 | Mark McLoughlin | snprintf(s->down_script, sizeof(s->down_script), "%s", downscript); |
449 | 5281d757 | Mark McLoughlin | snprintf(s->down_script_arg, sizeof(s->down_script_arg), "%s", ifname); |
450 | 5281d757 | Mark McLoughlin | } |
451 | 5281d757 | Mark McLoughlin | } |
452 | 5281d757 | Mark McLoughlin | |
453 | 5281d757 | Mark McLoughlin | return 0; |
454 | 5281d757 | Mark McLoughlin | } |