d89d5884eb
Test: TreeHugger Signed-off-by: Maciej Żenczykowski <maze@google.com> Change-Id: I18ccf19024f0617778799f548c8707a518eefadc git-subtree-dir: clatd git-subtree-mainline:655d0850acgit-subtree-split:2007830075
82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
/*
|
|
* Copyright 2011 Daniel Drown
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* clatd.h - main routines used by clatd
|
|
*/
|
|
#ifndef __CLATD_H__
|
|
#define __CLATD_H__
|
|
|
|
#include <signal.h>
|
|
#include <stdlib.h>
|
|
#include <sys/uio.h>
|
|
|
|
struct tun_data;
|
|
|
|
// IPv4 header has a u16 total length field, for maximum L3 mtu of 0xFFFF.
|
|
//
|
|
// Translating IPv4 to IPv6 requires removing the IPv4 header (20) and adding
|
|
// an IPv6 header (40), possibly with an extra ipv6 fragment extension header (8).
|
|
//
|
|
// As such the maximum IPv4 L3 mtu size is 0xFFFF (by u16 tot_len field)
|
|
// and the maximum IPv6 L3 mtu size is 0xFFFF + 28 (which is larger)
|
|
//
|
|
// A received non-jumbogram IPv6 frame could potentially be u16 payload_len = 0xFFFF
|
|
// + sizeof ipv6 header = 40, bytes in size. But such a packet cannot be meaningfully
|
|
// converted to IPv4 (it's too large). As such the restriction is the same: 0xFFFF + 28
|
|
//
|
|
// (since there's no jumbogram support in IPv4, IPv6 jumbograms cannot be meaningfully
|
|
// converted to IPv4 anyway, and are thus entirely unsupported)
|
|
#define MAXMTU (0xFFFF + 28)
|
|
|
|
// logcat_hexdump() maximum binary data length, this is the maximum packet size
|
|
// plus some extra space for various headers:
|
|
// struct tun_pi (4 bytes)
|
|
// struct virtio_net_hdr (10 bytes)
|
|
// ethernet (14 bytes), potentially including vlan tag (4) or tags (8 or 12)
|
|
// plus some extra just-in-case headroom, because it doesn't hurt.
|
|
#define MAXDUMPLEN (64 + MAXMTU)
|
|
|
|
#define CLATD_VERSION "1.7"
|
|
|
|
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
|
|
|
|
extern volatile sig_atomic_t running;
|
|
|
|
void event_loop(struct tun_data *tunnel);
|
|
|
|
/* function: parse_int
|
|
* parses a string as a decimal/hex/octal signed integer
|
|
* str - the string to parse
|
|
* out - the signed integer to write to, gets clobbered on failure
|
|
*/
|
|
static inline int parse_int(const char *str, int *out) {
|
|
char *end_ptr;
|
|
*out = strtol(str, &end_ptr, 0);
|
|
return *str && !*end_ptr;
|
|
}
|
|
|
|
/* function: parse_unsigned
|
|
* parses a string as a decimal/hex/octal unsigned integer
|
|
* str - the string to parse
|
|
* out - the unsigned integer to write to, gets clobbered on failure
|
|
*/
|
|
static inline int parse_unsigned(const char *str, unsigned *out) {
|
|
char *end_ptr;
|
|
*out = strtoul(str, &end_ptr, 0);
|
|
return *str && !*end_ptr;
|
|
}
|
|
|
|
#endif /* __CLATD_H__ */
|