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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 | 73d96e29 | Blue Swirl | #include "qemu-error.h" |
29 | e7e92325 | Mark McLoughlin | |
30 | e7e92325 | Mark McLoughlin | #ifdef __NetBSD__
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31 | e7e92325 | Mark McLoughlin | #include <net/if_tap.h> |
32 | e7e92325 | Mark McLoughlin | #endif
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33 | e7e92325 | Mark McLoughlin | |
34 | a167ba50 | Aurelien Jarno | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
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35 | e7e92325 | Mark McLoughlin | #include <libutil.h> |
36 | e7e92325 | Mark McLoughlin | #else
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37 | e7e92325 | Mark McLoughlin | #include <util.h> |
38 | e7e92325 | Mark McLoughlin | #endif
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39 | e7e92325 | Mark McLoughlin | |
40 | e7e92325 | Mark McLoughlin | int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required) |
41 | e7e92325 | Mark McLoughlin | { |
42 | e7e92325 | Mark McLoughlin | int fd;
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43 | e7e92325 | Mark McLoughlin | char *dev;
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44 | e7e92325 | Mark McLoughlin | struct stat s;
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45 | e7e92325 | Mark McLoughlin | |
46 | a167ba50 | Aurelien Jarno | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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47 | 2f859a3c | Juergen Lock | /* if no ifname is given, always start the search from tap0. */
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48 | 2f859a3c | Juergen Lock | int i;
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49 | 2f859a3c | Juergen Lock | char dname[100]; |
50 | 2f859a3c | Juergen Lock | |
51 | 2f859a3c | Juergen Lock | for (i = 0; i < 10; i++) { |
52 | 2f859a3c | Juergen Lock | if (*ifname) {
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53 | 2f859a3c | Juergen Lock | snprintf(dname, sizeof dname, "/dev/%s", ifname); |
54 | 2f859a3c | Juergen Lock | } else {
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55 | 2f859a3c | Juergen Lock | snprintf(dname, sizeof dname, "/dev/tap%d", i); |
56 | 2f859a3c | Juergen Lock | } |
57 | 2f859a3c | Juergen Lock | TFR(fd = open(dname, O_RDWR)); |
58 | 2f859a3c | Juergen Lock | if (fd >= 0) { |
59 | 2f859a3c | Juergen Lock | break;
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60 | 2f859a3c | Juergen Lock | } |
61 | 2f859a3c | Juergen Lock | else if (errno == ENXIO || errno == ENOENT) { |
62 | 2f859a3c | Juergen Lock | break;
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63 | 2f859a3c | Juergen Lock | } |
64 | 2f859a3c | Juergen Lock | if (*ifname) {
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65 | 2f859a3c | Juergen Lock | break;
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66 | 2f859a3c | Juergen Lock | } |
67 | 2f859a3c | Juergen Lock | } |
68 | 2f859a3c | Juergen Lock | if (fd < 0) { |
69 | 1ecda02b | Markus Armbruster | error_report("warning: could not open %s (%s): no virtual network emulation",
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70 | 1ecda02b | Markus Armbruster | dname, strerror(errno)); |
71 | 2f859a3c | Juergen Lock | return -1; |
72 | 2f859a3c | Juergen Lock | } |
73 | 2f859a3c | Juergen Lock | #else
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74 | e7e92325 | Mark McLoughlin | TFR(fd = open("/dev/tap", O_RDWR));
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75 | e7e92325 | Mark McLoughlin | if (fd < 0) { |
76 | e7e92325 | Mark McLoughlin | fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n");
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77 | e7e92325 | Mark McLoughlin | return -1; |
78 | e7e92325 | Mark McLoughlin | } |
79 | 2f859a3c | Juergen Lock | #endif
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80 | e7e92325 | Mark McLoughlin | |
81 | e7e92325 | Mark McLoughlin | fstat(fd, &s); |
82 | e7e92325 | Mark McLoughlin | dev = devname(s.st_rdev, S_IFCHR); |
83 | e7e92325 | Mark McLoughlin | pstrcpy(ifname, ifname_size, dev); |
84 | e7e92325 | Mark McLoughlin | |
85 | 39ca4c08 | Juergen Lock | if (*vnet_hdr) {
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86 | 39ca4c08 | Juergen Lock | /* BSD doesn't have IFF_VNET_HDR */
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87 | 39ca4c08 | Juergen Lock | *vnet_hdr = 0;
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88 | 39ca4c08 | Juergen Lock | |
89 | 39ca4c08 | Juergen Lock | if (vnet_hdr_required && !*vnet_hdr) {
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90 | 1ecda02b | Markus Armbruster | error_report("vnet_hdr=1 requested, but no kernel "
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91 | 1ecda02b | Markus Armbruster | "support for IFF_VNET_HDR available");
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92 | 39ca4c08 | Juergen Lock | close(fd); |
93 | 39ca4c08 | Juergen Lock | return -1; |
94 | 39ca4c08 | Juergen Lock | } |
95 | 39ca4c08 | Juergen Lock | } |
96 | e7e92325 | Mark McLoughlin | fcntl(fd, F_SETFL, O_NONBLOCK); |
97 | e7e92325 | Mark McLoughlin | return fd;
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98 | e7e92325 | Mark McLoughlin | } |
99 | 15ac913b | Mark McLoughlin | |
100 | 15ac913b | Mark McLoughlin | int tap_set_sndbuf(int fd, QemuOpts *opts) |
101 | 15ac913b | Mark McLoughlin | { |
102 | 15ac913b | Mark McLoughlin | return 0; |
103 | 15ac913b | Mark McLoughlin | } |
104 | dc69004c | Mark McLoughlin | |
105 | dc69004c | Mark McLoughlin | int tap_probe_vnet_hdr(int fd) |
106 | dc69004c | Mark McLoughlin | { |
107 | dc69004c | Mark McLoughlin | return 0; |
108 | dc69004c | Mark McLoughlin | } |
109 | 1faac1f7 | Mark McLoughlin | |
110 | 9c282718 | Mark McLoughlin | int tap_probe_has_ufo(int fd) |
111 | 9c282718 | Mark McLoughlin | { |
112 | 9c282718 | Mark McLoughlin | return 0; |
113 | 9c282718 | Mark McLoughlin | } |
114 | 9c282718 | Mark McLoughlin | |
115 | 445d892f | Michael S. Tsirkin | int tap_probe_vnet_hdr_len(int fd, int len) |
116 | 445d892f | Michael S. Tsirkin | { |
117 | 445d892f | Michael S. Tsirkin | return 0; |
118 | 445d892f | Michael S. Tsirkin | } |
119 | 445d892f | Michael S. Tsirkin | |
120 | 445d892f | Michael S. Tsirkin | void tap_fd_set_vnet_hdr_len(int fd, int len) |
121 | 445d892f | Michael S. Tsirkin | { |
122 | 445d892f | Michael S. Tsirkin | } |
123 | 445d892f | Michael S. Tsirkin | |
124 | 1faac1f7 | Mark McLoughlin | void tap_fd_set_offload(int fd, int csum, int tso4, |
125 | 1faac1f7 | Mark McLoughlin | int tso6, int ecn, int ufo) |
126 | 1faac1f7 | Mark McLoughlin | { |
127 | 1faac1f7 | Mark McLoughlin | } |