summaryrefslogtreecommitdiffstats
path: root/src/internal_bypass.c
blob: 8ecec34c63560d773410ba68ce1f95b82b1f9053 (plain)
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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/*
 * (C) 2006-2011 by Pablo Neira Ayuso <pablo@netfilter.org>
 * (C) 2011 by Vyatta Inc. <http://www.vyatta.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This feature has been sponsored by 6WIND <www.6wind.com>.
 */
#include "conntrackd.h"
#include "sync.h"
#include "log.h"
#include "cache.h"
#include "netlink.h"
#include "network.h"
#include "origin.h"

static int internal_bypass_init(void)
{
	return 0;
}

static void internal_bypass_close(void)
{
}

static int
internal_bypass_ct_dump_cb(enum nf_conntrack_msg_type type,
			   struct nf_conntrack *ct, void *data)
{
	char buf[1024];
	int size, *fd = data;

	if (ct_filter_conntrack(ct, 1))
		return NFCT_CB_CONTINUE;

	size = nfct_snprintf(buf, 1024, ct, NFCT_T_UNKNOWN, NFCT_O_DEFAULT, 0);
	if (size < 1024) {
		buf[size] = '\n';
		size++;
	}
	send(*fd, buf, size, 0);

	return NFCT_CB_CONTINUE;
}

static void internal_bypass_ct_dump(int fd, int type)
{
	struct nfct_handle *h;
	u_int32_t family = AF_UNSPEC;
	int ret;

	h = nfct_open(CONNTRACK, 0);
	if (h == NULL) {
		dlog(LOG_ERR, "can't allocate memory for the internal cache");
		return;
	}
	nfct_callback_register(h, NFCT_T_ALL, internal_bypass_ct_dump_cb, &fd);
	ret = nfct_query(h, NFCT_Q_DUMP, &family);
	if (ret == -1) {
		dlog(LOG_ERR, "can't dump kernel table");
	}
	nfct_close(h);
}

static void internal_bypass_ct_flush(void)
{
	nl_flush_conntrack_table(STATE(flush));
}

struct {
	uint32_t	new;
	uint32_t	upd;
	uint32_t	del;
} internal_bypass_stats;

static void internal_bypass_ct_stats(int fd)
{
	char buf[512];
	int size;

	size = sprintf(buf, "internal bypass:\n"
			    "connections new:\t\t%12u\n"
			    "connections updated:\t\t%12u\n"
			    "connections destroyed:\t\t%12u\n\n",
			    internal_bypass_stats.new,
			    internal_bypass_stats.upd,
			    internal_bypass_stats.del);

	send(fd, buf, size, 0);
}

/* unused, INTERNAL_F_POPULATE is unset. No cache, nothing to populate. */
static void internal_bypass_ct_populate(struct nf_conntrack *ct)
{
}

/* unused, INTERNAL_F_RESYNC is unset. */
static void internal_bypass_ct_purge(void)
{
}

/* unused, INTERNAL_F_RESYNC is unset. Nothing to resync, we have no cache. */
static int
internal_bypass_ct_resync(enum nf_conntrack_msg_type type,
			  struct nf_conntrack *ct, void *data)
{
	return NFCT_CB_CONTINUE;
}

static void internal_bypass_ct_event_new(struct nf_conntrack *ct, int origin)
{
	struct nethdr *net;

	/* this event has been triggered by me, skip */
	if (origin != CTD_ORIGIN_NOT_ME)
		return;

	net = BUILD_NETMSG(ct, NET_T_STATE_NEW);
	multichannel_send(STATE_SYNC(channel), net);
	internal_bypass_stats.new++;
}

static void internal_bypass_ct_event_upd(struct nf_conntrack *ct, int origin)
{
	struct nethdr *net;

	/* this event has been triggered by me, skip */
	if (origin != CTD_ORIGIN_NOT_ME)
		return;

	net = BUILD_NETMSG(ct, NET_T_STATE_UPD);
	multichannel_send(STATE_SYNC(channel), net);
	internal_bypass_stats.upd++;
}

static int internal_bypass_ct_event_del(struct nf_conntrack *ct, int origin)
{
	struct nethdr *net;

	/* this event has been triggered by me, skip */
	if (origin != CTD_ORIGIN_NOT_ME)
		return 1;

	net = BUILD_NETMSG(ct, NET_T_STATE_DEL);
	multichannel_send(STATE_SYNC(channel), net);
	internal_bypass_stats.del++;

	return 1;
}

struct internal_handler internal_bypass = {
	.init			= internal_bypass_init,
	.close			= internal_bypass_close,
	.ct = {
		.dump			= internal_bypass_ct_dump,
		.flush			= internal_bypass_ct_flush,
		.stats			= internal_bypass_ct_stats,
		.stats_ext		= internal_bypass_ct_stats,
		.populate		= internal_bypass_ct_populate,
		.purge			= internal_bypass_ct_purge,
		.resync			= internal_bypass_ct_resync,
		.new			= internal_bypass_ct_event_new,
		.upd			= internal_bypass_ct_event_upd,
		.del			= internal_bypass_ct_event_del,
	},
};