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#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 "built_in.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, htons(ETH_P_ALL));
if (unlikely(sock < 0))
panic("Creation of PF socket failed: %s\n", strerror(errno));
return sock;
}
int pf_tx_socket(void)
{
int sock = socket(PF_PACKET, SOCK_RAW, 0);
if (unlikely(sock < 0))
panic("Creation of PF TX socket failed: %s\n", strerror(errno));
return sock;
}
/* Avail in kernel >= 3.14
* in commit d346a3fae3 (packet: introduce PACKET_QDISC_BYPASS socket option)
*/
void set_sock_qdisc_bypass(int fd, int 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] = "/proc/sys/net/core/rmem_max",
[sock_rmem_def] = "/proc/sys/net/core/rmem_default",
[sock_wmem_max] = "/proc/sys/net/core/wmem_max",
[sock_wmem_def] = "/proc/sys/net/core/wmem_default",
};
static int get_system_socket_mem(int which)
{
int fd, val = -1;
ssize_t ret;
const char *file = sock_mem[which];
char buff[64];
fd = open(file, O_RDONLY);
if (fd < 0)
return val;
ret = read(fd, buff, sizeof(buff));
if (ret > 0)
val = atoi(buff);
close(fd);
return val;
}
static void set_system_socket_mem(int which, int val)
{
int fd;
const char *file = sock_mem[which];
ssize_t ret;
char buff[64];
fd = open(file, O_WRONLY);
if (fd < 0)
return;
memset(buff, 0, sizeof(buff));
slprintf(buff, sizeof(buff), "%d", val);
ret = write(fd, buff, strlen(buff));
if (ret < 0)
panic("Cannot set system socket memory!\n");
close(fd);
}
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]);
}
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