summaryrefslogtreecommitdiff
path: root/sock.c
blob: 634771bdd845d6a792bbe8c3216eda71902644b1 (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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
#include <sys/types.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <arpa/inet.h>
#include <linux/if_ether.h>
#include <linux/tcp.h>

#include "sock.h"
#include "die.h"
#include "str.h"
#include "linktype.h"
#include "built_in.h"
#include "sysctl.h"

int af_socket(int af)
{
	int sock;

	if (unlikely(af != AF_INET && af != AF_INET6))
		panic("Wrong AF socket type!\n");

	sock = socket(af, SOCK_DGRAM, 0);
	if (unlikely(sock < 0))
		panic("Creation AF socket failed: %s\n", strerror(errno));

	return sock;
}

int pf_socket(void)
{
	int sock = socket(PF_PACKET, SOCK_RAW, 0);
	if (unlikely(sock < 0))
		panic("Creation of PF socket failed: %s\n", strerror(errno));

	return sock;
}

static int pf_socket_dgram(void)
{
	int sock = socket(PF_PACKET, SOCK_DGRAM, 0);
	if (unlikely(sock < 0))
		panic("Creation of PF dgram socket failed: %s\n",
		      strerror(errno));

	return sock;
}

int pf_socket_type(uint32_t type)
{
	switch (type) {
	case LINKTYPE_LINUX_SLL:
		return pf_socket_dgram();
	default:
		return pf_socket();
	}
}

/* Available in kernel >= 3.14
 * in commit d346a3fae3 (packet: introduce PACKET_QDISC_BYPASS socket option)
 */
void set_sock_qdisc_bypass(int fd, bool verbose)
{
	int ret, val = 1;

	ret = setsockopt(fd, SOL_PACKET, PACKET_QDISC_BYPASS, &val, sizeof(val));
	if (ret < 0) {
		if (errno == ENOPROTOOPT) {
			if (verbose)
				printf("No kernel support for PACKET_QDISC_BYPASS"
				       " (kernel < 3.14?)\n");
		} else
			perror("Cannot set PACKET_QDISC_BYPASS");
	} else
		if (verbose) printf("Enabled kernel qdisc bypass\n");
}

void set_sock_prio(int fd, int prio)
{
	int ret, val = prio;

	ret = setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &val, sizeof(val));
	if (unlikely(ret))
		panic("Cannot set socket priority: %s\n", strerror(errno));
}

void set_nonblocking(int fd)
{
	int ret = fcntl(fd, F_SETFL, fcntl(fd, F_GETFD, 0) | O_NONBLOCK);
	if (unlikely(ret < 0))
		panic("Cannot fcntl: %s\n", strerror(errno));
}

int set_nonblocking_sloppy(int fd)
{
	return fcntl(fd, F_SETFL, fcntl(fd, F_GETFD, 0) | O_NONBLOCK);
}

void set_socket_keepalive(int fd)
{
	int ret, one = 1;

	ret = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one));
	if (unlikely(ret))
		panic("Cannot set TCP keepalive: %s\n", strerror(errno));
}

void set_tcp_nodelay(int fd)
{
	int ret, one = 1;

	ret = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
	if (unlikely(ret))
		panic("Cannot set TCP nodelay: %s\n", strerror(errno));
}

int set_ipv6_only(int fd)
{
	int one = 1;
	return setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
}

int set_reuseaddr(int fd)
{
	int ret, one = 1;

	ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
	if (unlikely(ret < 0))
		panic("Cannot reuse addr: %s\n", strerror(errno));

	return 0;
}

void set_mtu_disc_dont(int fd)
{
	int mtu = IP_PMTUDISC_DONT, ret;

	ret = setsockopt(fd, SOL_IP, IP_MTU_DISCOVER, &mtu, sizeof(mtu));
	if (unlikely(ret))
		panic("Cannot set MTU discovery options: %s\n", strerror(errno));
}

enum {
	sock_rmem_max = 0,
	sock_rmem_def,
	sock_wmem_max,
	sock_wmem_def,
};

#define SMEM_SUG_MAX	104857600
#define SMEM_SUG_DEF	4194304

static const char *const sock_mem[] = {
	[sock_rmem_max] = "net/core/rmem_max",
	[sock_rmem_def] = "net/core/rmem_default",
	[sock_wmem_max] = "net/core/wmem_max",
	[sock_wmem_def] = "net/core/wmem_default",
};

static int get_system_socket_mem(int which)
{
	int val;

	if (sysctl_get_int(sock_mem[which], &val))
		return -1;

	return val;
}

static void set_system_socket_mem(int which, int val)
{
	if (val > 0 && sysctl_set_int(sock_mem[which], val))
		printf("Cannot set system socket memory in %s%s: %s\n",
		       SYSCTL_PROC_PATH, sock_mem[which], strerror(errno));
}

void set_system_socket_memory(int *vals, size_t len)
{
	bug_on(len != 4);

	if ((vals[0] = get_system_socket_mem(sock_rmem_max)) < SMEM_SUG_MAX)
		set_system_socket_mem(sock_rmem_max, SMEM_SUG_MAX);
	if ((vals[1] = get_system_socket_mem(sock_rmem_def)) < SMEM_SUG_DEF)
		set_system_socket_mem(sock_rmem_def, SMEM_SUG_DEF);
	if ((vals[2] = get_system_socket_mem(sock_wmem_max)) < SMEM_SUG_MAX)
		set_system_socket_mem(sock_wmem_max, SMEM_SUG_MAX);
	if ((vals[3] = get_system_socket_mem(sock_wmem_def)) < SMEM_SUG_DEF)
		set_system_socket_mem(sock_wmem_def, SMEM_SUG_DEF);
}

void reset_system_socket_memory(int *vals, size_t len)
{
	bug_on(len != 4);

	set_system_socket_mem(sock_rmem_max, vals[0]);
	set_system_socket_mem(sock_rmem_def, vals[1]);
	set_system_socket_mem(sock_wmem_max, vals[2]);
	set_system_socket_mem(sock_wmem_def, vals[3]);
}