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79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/*
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* Copyright © 2026 Apple Inc. and the Containerization project authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#if defined(__linux__)
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#include "cz_tap.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <net/if.h> /* struct ifreq, IFNAMSIZ */
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#include <string.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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/*
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* Avoid <linux/if_tun.h> — the Static Linux SDK (musl) used to cross-compile
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* vminitd ships <net/if.h> from musl but not the linux kernel UAPI headers.
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* The TUN ioctl number and flags are stable Linux ABI; redeclare locally.
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*
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* TUNSETIFF = _IOW('T', 202, int):
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* dir=IOC_WRITE(1)<<30 | size(4)<<16 | type('T'=0x54)<<8 | nr(202=0xCA)
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* = 0x400454CA
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* Architecture-independent (Linux's ioctl encoding is the same on x86/arm).
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*/
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#ifndef TUNSETIFF
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#define TUNSETIFF 0x400454CAu
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#endif
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#ifndef IFF_TAP
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#define IFF_TAP 0x0002
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#endif
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#ifndef IFF_NO_PI
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#define IFF_NO_PI 0x1000
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#endif
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int cz_tap_create(const char *requested_name, char *out_name, size_t out_name_len) {
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if (out_name == NULL || out_name_len < IFNAMSIZ) {
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return -EINVAL;
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}
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int fd = open("/dev/net/tun", O_RDWR | O_CLOEXEC);
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if (fd < 0) {
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return -errno;
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}
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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if (requested_name != NULL && requested_name[0] != '\0') {
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strncpy(ifr.ifr_name, requested_name, IFNAMSIZ - 1);
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}
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if (ioctl(fd, TUNSETIFF, &ifr) < 0) {
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int saved = errno;
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close(fd);
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return -saved;
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}
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/* Copy out the resolved name. ifr.ifr_name is always NUL-terminated
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* within IFNAMSIZ by the kernel. */
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memset(out_name, 0, out_name_len);
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strncpy(out_name, ifr.ifr_name, IFNAMSIZ - 1);
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return fd;
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}
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#endif /* __linux__ */
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