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