5ae193ae36
but only enable it in enforcing mode on aarch64, since that gets good test coverage via Pixel on GoogleGuest ipv6-only wifi network and (for example) T-Mobile US cellular. For other architectures this will only result in (automatically ratelimitted to at most 5/s) audit logs for any 'unusual' system calls. Test: TreeHugger, manually on Pixel on GoogleGuest wifi Signed-off-by: Maciej Żenczykowski <maze@google.com> Change-Id: Id14c6d9db8d7b4652c7358cac101a82ef09843e0
83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
/*
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* Copyright 2011 Daniel Drown
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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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* http://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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* clatd.h - main routines used by clatd
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*/
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#ifndef __CLATD_H__
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#define __CLATD_H__
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#include <signal.h>
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#include <stdlib.h>
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#include <sys/uio.h>
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struct tun_data;
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// IPv4 header has a u16 total length field, for maximum L3 mtu of 0xFFFF.
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//
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// Translating IPv4 to IPv6 requires removing the IPv4 header (20) and adding
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// an IPv6 header (40), possibly with an extra ipv6 fragment extension header (8).
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//
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// As such the maximum IPv4 L3 mtu size is 0xFFFF (by u16 tot_len field)
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// and the maximum IPv6 L3 mtu size is 0xFFFF + 28 (which is larger)
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//
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// A received non-jumbogram IPv6 frame could potentially be u16 payload_len = 0xFFFF
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// + sizeof ipv6 header = 40, bytes in size. But such a packet cannot be meaningfully
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// converted to IPv4 (it's too large). As such the restriction is the same: 0xFFFF + 28
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//
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// (since there's no jumbogram support in IPv4, IPv6 jumbograms cannot be meaningfully
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// converted to IPv4 anyway, and are thus entirely unsupported)
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#define MAXMTU (0xFFFF + 28)
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// logcat_hexdump() maximum binary data length, this is the maximum packet size
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// plus some extra space for various headers:
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// struct tun_pi (4 bytes)
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// struct virtio_net_hdr (10 bytes)
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// ethernet (14 bytes), potentially including vlan tag (4) or tags (8 or 12)
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// plus some extra just-in-case headroom, because it doesn't hurt.
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#define MAXDUMPLEN (64 + MAXMTU)
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#define CLATD_VERSION "1.8"
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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extern volatile sig_atomic_t sigterm;
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void send_dad(int fd, const struct in6_addr* tgt);
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void event_loop(struct tun_data *tunnel);
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/* function: parse_int
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* parses a string as a decimal/hex/octal signed integer
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* str - the string to parse
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* out - the signed integer to write to, gets clobbered on failure
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*/
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static inline int parse_int(const char *str, int *out) {
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char *end_ptr;
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*out = strtol(str, &end_ptr, 0);
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return *str && !*end_ptr;
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}
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/* function: parse_unsigned
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* parses a string as a decimal/hex/octal unsigned integer
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* str - the string to parse
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* out - the unsigned integer to write to, gets clobbered on failure
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*/
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static inline int parse_unsigned(const char *str, unsigned *out) {
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char *end_ptr;
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*out = strtoul(str, &end_ptr, 0);
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return *str && !*end_ptr;
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}
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#endif /* __CLATD_H__ */
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