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// linux.c: low level access routines for Linux
#define _GNU_SOURCE
#include "config.h"
#include <sys/socket.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <features.h> /* for the glibc version number */
#if __GLIBC__ >= 2 && __GLIBC_MINOR >= 1
#include <netpacket/packet.h>
#include <net/ethernet.h> /* the L2 protocols */
#else
#include <asm/types.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h> /* The L2 protocols */
#endif
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <net/if.h>
#include <netinet/in.h>
#include <linux/fs.h>
#include <sys/stat.h>
#include "dat.h"
#include "fns.h"
int getindx(int, char *);
int getea(int, char *, uchar *);
int
dial(char *eth, int bufcnt) // get us a raw connection to an interface
{
int i, n, s;
struct sockaddr_ll sa;
enum { aoe_type = 0x88a2 };
memset(&sa, 0, sizeof sa);
s = socket(PF_PACKET, SOCK_RAW, htons(aoe_type));
if (s == -1) {
perror("got bad socket");
return -1;
}
i = getindx(s, eth);
if (i < 0) {
perror(eth);
return -1;
}
sa.sll_family = AF_PACKET;
sa.sll_protocol = htons(0x88a2);
sa.sll_ifindex = i;
n = bind(s, (struct sockaddr *)&sa, sizeof sa);
if (n == -1) {
perror("bind funky");
return -1;
}
struct bpf_program {
ulong bf_len;
void *bf_insns;
} *bpf_program = create_bpf_program(shelf, slot);
setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, bpf_program, sizeof(*bpf_program));
free_bpf_program(bpf_program);
n = bufcnt * getmtu(s, eth);
if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) < 0)
perror("setsockopt SOL_SOCKET, SO_SNDBUF");
if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) < 0)
perror("setsockopt SOL_SOCKET, SO_RCVBUF");
return s;
}
int
getindx(int s, char *name) // return the index of device 'name'
{
struct ifreq xx;
int n;
snprintf(xx.ifr_name, sizeof xx.ifr_name, "%s", name);
n = ioctl(s, SIOCGIFINDEX, &xx);
if (n == -1)
return -1;
return xx.ifr_ifindex;
}
int
getea(int s, char *name, uchar *ea)
{
struct ifreq xx;
int n;
snprintf(xx.ifr_name, sizeof xx.ifr_name, "%s", name);
n = ioctl(s, SIOCGIFHWADDR, &xx);
if (n == -1) {
perror("Can't get hw addr");
return 0;
}
memmove(ea, xx.ifr_hwaddr.sa_data, 6);
return 1;
}
int
getmtu(int s, char *name)
{
struct ifreq xx;
int n;
snprintf(xx.ifr_name, sizeof xx.ifr_name, "%s", name);
n = ioctl(s, SIOCGIFMTU, &xx);
if (n == -1) {
perror("Can't get mtu");
return 1500;
}
return xx.ifr_mtu;
}
int
getsec(int fd, uchar *place, vlong lba, int nsec)
{
return pread(fd, place, nsec * 512, lba * 512);
}
int
putsec(int fd, uchar *place, vlong lba, int nsec)
{
return pwrite(fd, place, nsec * 512, lba * 512);
}
int
getpkt(int fd, uchar *buf, int sz)
{
return read(fd, buf, sz);
}
int
putpkt(int fd, uchar *buf, int sz)
{
return write(fd, buf, sz);
}
vlong
getsize(int fd)
{
vlong size;
struct stat s;
int n;
n = ioctl(fd, BLKGETSIZE64, &size);
if (n == -1) { // must not be a block special
n = fstat(fd, &s);
if (n == -1) {
perror("getsize");
exit(1);
}
size = s.st_size;
}
return size;
}
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