aboutgitcodebugslistschat
path: root/util.h
blob: 1c11474e5e36794a99c378219027372b4e9f340d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
void err(const char *format, ...);
void warn(const char *format, ...);
void info(const char *format, ...);

#ifdef DEBUG
void debug(const char *format, ...);
#else
#define debug(...) { }
#endif

#define CHECK_SET_MIN_MAX(basename, fd)					\
	do {								\
		if ((fd) < basename##min)				\
			basename##min = (fd);				\
		if ((fd) > basename##max)				\
			basename##max = (fd);				\
	} while (0)

#define CHECK_SET_MIN_MAX_PROTO_FD(proto, ipproto, proto_ctx, fd)	\
	do {								\
		if ((proto) == (ipproto))				\
			CHECK_SET_MIN_MAX(c->proto_ctx.fd_, (fd));	\
	} while (0)

#ifndef MIN
#define MIN(x, y)		(((x) < (y)) ? (x) : (y))
#endif
#ifndef MAX
#define MAX(x, y)		(((x) > (y)) ? (x) : (y))
#endif

#define SWAP(a, b)							\
	do {								\
		typeof(a) __x = (a); (a) = (b); (b) = __x;		\
	} while (0)							\

#define STRINGIFY(x)	#x
#define STR(x)		STRINGIFY(x)

#define V4		0
#define V6		1
#define IP_VERSIONS	2

#define ARRAY_SIZE(a)		((int)(sizeof(a) / sizeof((a)[0])))

#define IN_INTERVAL(a, b, x)	((x) >= (a) && (x) <= (b))
#define FD_PROTO(x, proto)						\
	(IN_INTERVAL(c->proto.fd_min, c->proto.fd_max, (x)))

#define PORT_EPHEMERAL_MIN	((1 << 15) + (1 << 14))		/* RFC 6335 */
#define PORT_IS_EPHEMERAL(port) ((port) >= PORT_EPHEMERAL_MIN)

#define NS_FN_STACK_SIZE	(RLIMIT_STACK_VAL * 1024 / 4)

#if __BYTE_ORDER == __BIG_ENDIAN
#define L2_BUF_ETH_IP4_INIT						\
	{								\
		.h_dest		= { 0 },				\
		.h_source	= { 0 },				\
		.h_proto	= ETH_P_IP,				\
	}
#else
#define L2_BUF_ETH_IP4_INIT						\
	{								\
		.h_dest		= { 0 },				\
		.h_source	= { 0 },				\
		.h_proto	= __bswap_constant_16(ETH_P_IP),	\
	}
#endif

#if __BYTE_ORDER == __BIG_ENDIAN
#define L2_BUF_ETH_IP6_INIT						\
	{								\
		.h_dest		= { 0 },				\
		.h_source	= { 0 },				\
		.h_proto	= ETH_P_IPV6,				\
	}
#else
#define L2_BUF_ETH_IP6_INIT						\
	{								\
		.h_dest		= { 0 },				\
		.h_source	= { 0 },				\
		.h_proto	= __bswap_constant_16(ETH_P_IPV6),	\
	}
#endif

#define L2_BUF_IP4_INIT(proto)						\
	{								\
		.version	= 4,					\
		.ihl		= 5,					\
		.tos		= 0,					\
		.tot_len	= 0,					\
		.id		= 0,					\
		.frag_off	= 0,					\
		.ttl		= 255,					\
		.protocol	= (proto),				\
		.saddr		= 0,					\
		.daddr		= 0,					\
	}

#define L2_BUF_IP6_INIT(proto)						\
	{								\
		.priority	= 0,					\
		.version	= 6,					\
		.flow_lbl	= { 0 },				\
		.payload_len	= 0,					\
		.nexthdr	= (proto),				\
		.hop_limit	= 255,					\
		.saddr		= IN6ADDR_ANY_INIT,			\
		.daddr		= IN6ADDR_ANY_INIT,			\
	}

#include <linux/ipv6.h>
#include <net/if.h>
#include <linux/ip.h>
#include <limits.h>

struct ctx;

char *ipv6_l4hdr(struct ipv6hdr *ip6h, uint8_t *proto);
int sock_l4(struct ctx *c, int af, uint8_t proto, uint16_t port, int lo,
	    uint32_t data);
int timespec_diff_ms(struct timespec *a, struct timespec *b);
void bitmap_set(uint8_t *map, int bit);
void bitmap_clear(uint8_t *map, int bit);
int bitmap_isset(uint8_t *map, int bit);
void procfs_scan_listen(char *name, uint8_t *map);
int ns_enter(int target_pid);