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1 | e7e92325 | Mark McLoughlin | /*
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2 | e7e92325 | Mark McLoughlin | * QEMU System Emulator
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3 | e7e92325 | Mark McLoughlin | *
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4 | e7e92325 | Mark McLoughlin | * Copyright (c) 2003-2008 Fabrice Bellard
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5 | e7e92325 | Mark McLoughlin | *
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6 | e7e92325 | Mark McLoughlin | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | e7e92325 | Mark McLoughlin | * of this software and associated documentation files (the "Software"), to deal
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8 | e7e92325 | Mark McLoughlin | * in the Software without restriction, including without limitation the rights
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9 | e7e92325 | Mark McLoughlin | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | e7e92325 | Mark McLoughlin | * copies of the Software, and to permit persons to whom the Software is
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11 | e7e92325 | Mark McLoughlin | * furnished to do so, subject to the following conditions:
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12 | e7e92325 | Mark McLoughlin | *
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13 | e7e92325 | Mark McLoughlin | * The above copyright notice and this permission notice shall be included in
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14 | e7e92325 | Mark McLoughlin | * all copies or substantial portions of the Software.
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15 | e7e92325 | Mark McLoughlin | *
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16 | e7e92325 | Mark McLoughlin | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | e7e92325 | Mark McLoughlin | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | e7e92325 | Mark McLoughlin | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | e7e92325 | Mark McLoughlin | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | e7e92325 | Mark McLoughlin | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | e7e92325 | Mark McLoughlin | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | e7e92325 | Mark McLoughlin | * THE SOFTWARE.
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23 | e7e92325 | Mark McLoughlin | */
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24 | e7e92325 | Mark McLoughlin | |
25 | e7e92325 | Mark McLoughlin | #include "net/tap.h" |
26 | 71f4effc | Alexander Graf | #include "qemu-common.h" |
27 | 71f4effc | Alexander Graf | #include "sysemu.h" |
28 | e7e92325 | Mark McLoughlin | |
29 | e7e92325 | Mark McLoughlin | #ifdef __NetBSD__
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30 | e7e92325 | Mark McLoughlin | #include <net/if_tap.h> |
31 | e7e92325 | Mark McLoughlin | #endif
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32 | e7e92325 | Mark McLoughlin | |
33 | a167ba50 | Aurelien Jarno | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
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34 | e7e92325 | Mark McLoughlin | #include <libutil.h> |
35 | e7e92325 | Mark McLoughlin | #else
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36 | e7e92325 | Mark McLoughlin | #include <util.h> |
37 | e7e92325 | Mark McLoughlin | #endif
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38 | e7e92325 | Mark McLoughlin | |
39 | e7e92325 | Mark McLoughlin | #if defined(__OpenBSD__)
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40 | e7e92325 | Mark McLoughlin | #include <util.h> |
41 | e7e92325 | Mark McLoughlin | #endif
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42 | e7e92325 | Mark McLoughlin | |
43 | e7e92325 | Mark McLoughlin | int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required) |
44 | e7e92325 | Mark McLoughlin | { |
45 | e7e92325 | Mark McLoughlin | int fd;
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46 | e7e92325 | Mark McLoughlin | char *dev;
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47 | e7e92325 | Mark McLoughlin | struct stat s;
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48 | e7e92325 | Mark McLoughlin | |
49 | a167ba50 | Aurelien Jarno | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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50 | 2f859a3c | Juergen Lock | /* if no ifname is given, always start the search from tap0. */
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51 | 2f859a3c | Juergen Lock | int i;
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52 | 2f859a3c | Juergen Lock | char dname[100]; |
53 | 2f859a3c | Juergen Lock | |
54 | 2f859a3c | Juergen Lock | for (i = 0; i < 10; i++) { |
55 | 2f859a3c | Juergen Lock | if (*ifname) {
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56 | 2f859a3c | Juergen Lock | snprintf(dname, sizeof dname, "/dev/%s", ifname); |
57 | 2f859a3c | Juergen Lock | } else {
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58 | 2f859a3c | Juergen Lock | snprintf(dname, sizeof dname, "/dev/tap%d", i); |
59 | 2f859a3c | Juergen Lock | } |
60 | 2f859a3c | Juergen Lock | TFR(fd = open(dname, O_RDWR)); |
61 | 2f859a3c | Juergen Lock | if (fd >= 0) { |
62 | 2f859a3c | Juergen Lock | break;
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63 | 2f859a3c | Juergen Lock | } |
64 | 2f859a3c | Juergen Lock | else if (errno == ENXIO || errno == ENOENT) { |
65 | 2f859a3c | Juergen Lock | break;
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66 | 2f859a3c | Juergen Lock | } |
67 | 2f859a3c | Juergen Lock | if (*ifname) {
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68 | 2f859a3c | Juergen Lock | break;
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69 | 2f859a3c | Juergen Lock | } |
70 | 2f859a3c | Juergen Lock | } |
71 | 2f859a3c | Juergen Lock | if (fd < 0) { |
72 | 2f859a3c | Juergen Lock | qemu_error("warning: could not open %s (%s): no virtual network emulation\n", dname, strerror(errno));
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73 | 2f859a3c | Juergen Lock | return -1; |
74 | 2f859a3c | Juergen Lock | } |
75 | 2f859a3c | Juergen Lock | #else
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76 | e7e92325 | Mark McLoughlin | TFR(fd = open("/dev/tap", O_RDWR));
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77 | e7e92325 | Mark McLoughlin | if (fd < 0) { |
78 | e7e92325 | Mark McLoughlin | fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n");
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79 | e7e92325 | Mark McLoughlin | return -1; |
80 | e7e92325 | Mark McLoughlin | } |
81 | 2f859a3c | Juergen Lock | #endif
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82 | e7e92325 | Mark McLoughlin | |
83 | e7e92325 | Mark McLoughlin | fstat(fd, &s); |
84 | e7e92325 | Mark McLoughlin | dev = devname(s.st_rdev, S_IFCHR); |
85 | e7e92325 | Mark McLoughlin | pstrcpy(ifname, ifname_size, dev); |
86 | e7e92325 | Mark McLoughlin | |
87 | 39ca4c08 | Juergen Lock | if (*vnet_hdr) {
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88 | 39ca4c08 | Juergen Lock | /* BSD doesn't have IFF_VNET_HDR */
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89 | 39ca4c08 | Juergen Lock | *vnet_hdr = 0;
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90 | 39ca4c08 | Juergen Lock | |
91 | 39ca4c08 | Juergen Lock | if (vnet_hdr_required && !*vnet_hdr) {
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92 | 39ca4c08 | Juergen Lock | qemu_error("vnet_hdr=1 requested, but no kernel "
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93 | 39ca4c08 | Juergen Lock | "support for IFF_VNET_HDR available");
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94 | 39ca4c08 | Juergen Lock | close(fd); |
95 | 39ca4c08 | Juergen Lock | return -1; |
96 | 39ca4c08 | Juergen Lock | } |
97 | 39ca4c08 | Juergen Lock | } |
98 | e7e92325 | Mark McLoughlin | fcntl(fd, F_SETFL, O_NONBLOCK); |
99 | e7e92325 | Mark McLoughlin | return fd;
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100 | e7e92325 | Mark McLoughlin | } |
101 | 15ac913b | Mark McLoughlin | |
102 | 15ac913b | Mark McLoughlin | int tap_set_sndbuf(int fd, QemuOpts *opts) |
103 | 15ac913b | Mark McLoughlin | { |
104 | 15ac913b | Mark McLoughlin | return 0; |
105 | 15ac913b | Mark McLoughlin | } |
106 | dc69004c | Mark McLoughlin | |
107 | dc69004c | Mark McLoughlin | int tap_probe_vnet_hdr(int fd) |
108 | dc69004c | Mark McLoughlin | { |
109 | dc69004c | Mark McLoughlin | return 0; |
110 | dc69004c | Mark McLoughlin | } |
111 | 1faac1f7 | Mark McLoughlin | |
112 | 9c282718 | Mark McLoughlin | int tap_probe_has_ufo(int fd) |
113 | 9c282718 | Mark McLoughlin | { |
114 | 9c282718 | Mark McLoughlin | return 0; |
115 | 9c282718 | Mark McLoughlin | } |
116 | 9c282718 | Mark McLoughlin | |
117 | 1faac1f7 | Mark McLoughlin | void tap_fd_set_offload(int fd, int csum, int tso4, |
118 | 1faac1f7 | Mark McLoughlin | int tso6, int ecn, int ufo) |
119 | 1faac1f7 | Mark McLoughlin | { |
120 | 1faac1f7 | Mark McLoughlin | } |