bridge.c

eCos操作系统源码

	if (ioctl(s, SIOCBRDGDADDR, &ifba) < 0) {
		warnx3("%s: %s", brdg, addr);
		return (1);
	}

	return (0);
}

int
bridge_addaddr(s, brdg, ifname, addr)
	int s;
	char *brdg, *ifname, *addr;
{
	struct ifbareq ifba;
	struct ether_addr *ea;

	strncpy(ifba.ifba_name, brdg, sizeof(ifba.ifba_name));
	strncpy(ifba.ifba_ifsname, ifname, sizeof(ifba.ifba_ifsname));

	ea = ether_aton(addr);
	if (ea == NULL) {
		warnx2("Invalid address: %s", addr);
		return (1);
	}
	bcopy(ea, &ifba.ifba_dst, sizeof(struct ether_addr));
	ifba.ifba_flags = IFBAF_STATIC;

	if (ioctl(s, SIOCBRDGSADDR, &ifba) < 0) {
		warnx3("%s: %s", brdg, addr);
		return (1);
	}

	return (0);
}

int
bridge_addrs(s, brdg, delim)
	int s;
	char *brdg, *delim;
{
	struct ifbaconf ifbac;
	struct ifbareq *ifba;
	char *inbuf = NULL, buf[sizeof(ifba->ifba_ifsname) + 1];
	int i, len = 8192;

	while (1) {
		ifbac.ifbac_len = len;
		ifbac.ifbac_buf = inbuf = realloc(inbuf, len);
		strncpy(ifbac.ifbac_name, brdg, sizeof(ifbac.ifbac_name));
		if (inbuf == NULL)
			err(1, "malloc");
		if (ioctl(s, SIOCBRDGRTS, &ifbac) < 0) {
			if (errno == ENETDOWN)
				return (0);
			err(1, brdg);
		}
		if (ifbac.ifbac_len + sizeof(*ifba) < len)
			break;
		len *= 2;
	}

	for (i = 0; i < ifbac.ifbac_len / sizeof(*ifba); i++) {
		ifba = ifbac.ifbac_req + i;
		strncpy(buf, ifba->ifba_ifsname, sizeof(buf));
		diag_printf("%s%s %s %d ", delim, ether_ntoa(&ifba->ifba_dst),
		    buf, ifba->ifba_age);
		printb("flags", ifba->ifba_flags, IFBAFBITS);
		diag_printf("\n");
	}
        free(ifbac.ifbac_buf);
	return (0);
}

/*
 * Check to make sure 'brdg' is really a bridge interface.
 */
int
is_bridge(s, brdg)
	int s;
	char *brdg;
{
	struct ifreq ifr;
	struct ifbaconf ifbac;

	strncpy(ifr.ifr_name, brdg, sizeof(ifr.ifr_name));

	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0)
		return (0);

	ifbac.ifbac_len = 0;
	strncpy(ifbac.ifbac_name, brdg, sizeof(ifbac.ifbac_name));
	if (ioctl(s, SIOCBRDGRTS, (caddr_t)&ifbac) < 0) {
		if (errno == ENETDOWN)
			return (1);
		return (0);
	}
	return (1);
}

int
bridge_status(s, brdg)
	int s;
	char *brdg;
{
	struct ifreq ifr;
	struct ifbcachereq ifbc;
	struct ifbcachetoreq ifbct;
	int err;

	strncpy(ifr.ifr_name, brdg, sizeof(ifr.ifr_name));
	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
		warnx2("%s", brdg);
		if (errno == EPERM)
			return (1);
		return (1);
	}

	diag_printf("%s: ", brdg);
	printb("flags", ifr.ifr_flags, IFFBITS);
	diag_printf("\n");

	diag_printf("Interfaces:\n");
	err = bridge_list(s, brdg, "  ");
	if (err)
		return (err);

	strncpy(ifbc.ifbc_name, brdg, sizeof(ifbc.ifbc_name));
	if (ioctl(s, SIOCBRDGGCACHE, (caddr_t)&ifbc) < 0) {
		warnx2("%s", brdg);
		return (1);
	}

	strncpy(ifbct.ifbct_name, brdg, sizeof(ifbct.ifbct_name));
	if (ioctl(s, SIOCBRDGGTO, (caddr_t)&ifbct) < 0) {
		warnx2("%s", brdg);
		return (1);
	}

	diag_printf("Addresses (max cache: %d, timeout: %d):\n",
	    ifbc.ifbc_size, ifbct.ifbct_time);

	err = bridge_addrs(s, brdg, "   ");
	return (err);
}

int
bridge_flush_rule(s, brdg, ifname)
	int s;
	char *brdg, *ifname;
{
	struct ifbrlreq req;

	strncpy(req.ifbr_name, brdg, sizeof(req.ifbr_name));
	strncpy(req.ifbr_ifsname, ifname, sizeof(req.ifbr_ifsname));
	if (ioctl(s, SIOCBRDGFRL, &req) < 0) {
		warnx3("%s: %s", brdg, ifname);
		return (1);
	}
	return (0);
}

int
bridge_rules(s, brdg, ifname, delim)
	int s;
	char *brdg, *ifname;
	char *delim;
{
	char *inbuf = NULL;
	struct ifbrlconf ifc;
	struct ifbrlreq *ifrp, ifreq;
	int len = 8192, i;

	while (1) {
		ifc.ifbrl_len = len;
		ifc.ifbrl_buf = inbuf = realloc(inbuf, len);
		strncpy(ifc.ifbrl_name, brdg, sizeof(ifc.ifbrl_name));
		strncpy(ifc.ifbrl_ifsname, ifname, sizeof(ifc.ifbrl_ifsname));
		if (inbuf == NULL)
			err(1, "malloc");
		if (ioctl(s, SIOCBRDGGRL, &ifc) < 0)
			err(1, "ioctl(SIOCBRDGGRL)");
		if (ifc.ifbrl_len + sizeof(ifreq) < len)
			break;
		len *= 2;
	}
	ifrp = ifc.ifbrl_req;
	for (i = 0; i < ifc.ifbrl_len; i += sizeof(ifreq)) {
		ifrp = (struct ifbrlreq *)((caddr_t)ifc.ifbrl_req + i);
		bridge_showrule(ifrp, delim);
	}
        free(ifc.ifbrl_buf);
	return (0);
}

void
bridge_showrule(r, delim)
	struct ifbrlreq *r;
	char *delim;
{
	if (delim)
		diag_printf("%s    ", delim);
	else
		diag_printf("%s: ", r->ifbr_name);

	if (r->ifbr_action == BRL_ACTION_BLOCK)
		diag_printf("block ");
	else if (r->ifbr_action == BRL_ACTION_PASS)
		diag_printf("pass ");
	else
		diag_printf("[neither block nor pass?]\n");

	if ((r->ifbr_flags & (BRL_FLAG_IN | BRL_FLAG_OUT)) ==
	    (BRL_FLAG_IN | BRL_FLAG_OUT))
		diag_printf("in/out ");
	else if (r->ifbr_flags & BRL_FLAG_IN)
		diag_printf("in ");
	else if (r->ifbr_flags & BRL_FLAG_OUT)
		diag_printf("out ");
	else
		diag_printf("[neither in nor out?]\n");

	diag_printf("on %s", r->ifbr_ifsname);

	if (r->ifbr_flags & BRL_FLAG_SRCVALID)
		diag_printf(" src %s", ether_ntoa(&r->ifbr_src));
	if (r->ifbr_flags & BRL_FLAG_DSTVALID)
		diag_printf(" dst %s", ether_ntoa(&r->ifbr_dst));

	diag_printf("\n");
}

/*
 * Parse a rule definition and send it upwards.
 *
 * Syntax:
 *	{block|pass} {in|out|in/out} on {ifs} [src {mac}] [dst {mac}]
 */
int
bridge_rule(int s, char *brdg, int targc, char **targv, int ln)
{
	char **argv = targv;
	int argc = targc;
	struct ifbrlreq rule;
	struct ether_addr *ea, *dea;

	if (argc == 0) {
		diag_printf( "invalid rule\n");
		return (1);
	}
	rule.ifbr_flags = 0;
	rule.ifbr_action = 0;
	strncpy(rule.ifbr_name, brdg, sizeof(rule.ifbr_name));

	if (strcmp(argv[0], "block") == 0)
		rule.ifbr_action = BRL_ACTION_BLOCK;
	else if (strcmp(argv[0], "pass") == 0)
		rule.ifbr_action = BRL_ACTION_PASS;
	else
		goto bad_rule;
	argc--;	argv++;

	if (argc == 0) {
		bridge_badrule(targc, targv, ln);
		return (1);
	}
	if (strcmp(argv[0], "in") == 0)
		rule.ifbr_flags |= BRL_FLAG_IN;
	else if (strcmp(argv[0], "out") == 0)
		rule.ifbr_flags |= BRL_FLAG_OUT;
	else if (strcmp(argv[0], "in/out") == 0)
		rule.ifbr_flags |= BRL_FLAG_IN | BRL_FLAG_OUT;
	else
		goto bad_rule;
	argc--; argv++;

	if (argc == 0 || strcmp(argv[0], "on"))
		goto bad_rule;
	argc--; argv++;

	if (argc == 0)
		goto bad_rule;
	strncpy(rule.ifbr_ifsname, argv[0], sizeof(rule.ifbr_ifsname));
	argc--; argv++;

	while (argc) {
		if (strcmp(argv[0], "dst") == 0) {
			if (rule.ifbr_flags & BRL_FLAG_DSTVALID)
				goto bad_rule;
			rule.ifbr_flags |= BRL_FLAG_DSTVALID;
			dea = &rule.ifbr_dst;
		}
		else if (strcmp(argv[0], "src") == 0) {
			if (rule.ifbr_flags & BRL_FLAG_SRCVALID)
				goto bad_rule;
			rule.ifbr_flags |= BRL_FLAG_SRCVALID;
			dea = &rule.ifbr_src;
		}
		else
			goto bad_rule;

		argc--; argv++;

		if (argc == 0)
			goto bad_rule;
		ea = ether_aton(argv[0]);
		if (ea == NULL) {
			warnx2("Invalid address: %s", argv[0]);
			return (1);
		}
		bcopy(ea, dea, sizeof(*dea));
		argc--; argv++;
	}

	if (ioctl(s, SIOCBRDGARL, &rule) < 0) {
		warnx2("%s", brdg);
		return (1);
	}
	return (0);

bad_rule:
	bridge_badrule(targc, targv, ln);
	return (1);
}

#define MAXRULEWORDS 8
#ifdef ZAP
int
bridge_rulefile(s, brdg, fname)
	int s;
	char *brdg, *fname;
{
	FILE *f;
	char *str, *argv[MAXRULEWORDS], buf[1024], xbuf[1024];
	int ln = 1, argc = 0, err = 0, xerr;

	f = fopen(fname, "r");
	if (f == NULL) {
		warnx2("%s", fname);
		return (1);
	}

	while (1) {
		fgets(buf, sizeof(buf), f);
		if (feof(f))
			break;
		ln++;
		if (buf[0] == '#')
			continue;

		argc = 0;
		str = strtok(buf, "\n\r ");
		strncpy(xbuf, buf, sizeof(xbuf));
		while (str != NULL) {
			argv[argc++] = str;
			if (argc > MAXRULEWORDS) {
				diag_printf( "invalid rule: %d: %s\n",
				    ln, xbuf);
				break;
			}
			str = strtok(NULL, "\n\r ");
		}

		if (argc > MAXRULEWORDS)
			continue;

		xerr = bridge_rule(s, brdg, argc, argv, ln);
		if (xerr)
			err = xerr;
	}
	fclose(f);
	return (err);
}
#endif
void
bridge_badrule(argc, argv, ln)
	int argc, ln;
	char **argv;
{
	int i;

	diag_printf( "invalid rule: ");
	if (ln != -1)
		diag_printf( "%d: ", ln);
	for (i = 0; i < argc; i++) {
		diag_printf( "%s ", argv[i]);
	}
	diag_printf( "\n");
}

/*
 * Print a value ala the %b format of the kernel's printf
 * (borrowed from ifconfig.c)
 */
void
printb(s, v, bits)
	char *s;
	char *bits;
	unsigned short v;
{
	register int i, any = 0;
	register char c;

	if (bits && *bits == 8)
		diag_printf("%s=%o", s, v);
	else
		diag_printf("%s=%x", s, v);
	bits++;
	if (bits) {
		diag_printf("<");
		while ((i = *bits++)) {
			if (v & (1 << (i-1))) {
				if (any)
					diag_printf(",");
				any = 1;
				for (; (c = *bits) > 32; bits++)
					diag_printf("%c",c);
			} else
				for (; *bits > 32; bits++)
					;
		}
		diag_printf(">");
	}
}

static void 
interface_up(const char *intf)
{
  struct ifreq ifr;
  int s;

  s = socket(AF_INET, SOCK_DGRAM, 0);
  if (s < 0) {
    perror("socket");
    return;
  }

  strcpy(ifr.ifr_name, intf);
  ifr.ifr_flags = IFF_UP | IFF_BROADCAST | IFF_RUNNING;
  if (ioctl(s, SIOCSIFFLAGS, &ifr)) {
    perror("SIOCSIFFLAGS");
  }
  close(s);
}

static void
main_fn(cyg_addrword_t data) {

  int sock;
  char brdg[] = "bridge0";

  sock = socket(AF_INET, SOCK_DGRAM, 0);
  assert(sock >= 0);

#ifdef CYGHWR_NET_DRIVER_ETH0
  interface_up("eth0");
  eth0_up = 1;
  bridge_add(sock,brdg,"eth0");
#ifdef CYGPKG_NET_BRIDGE_STP_CODE
  bridge_ifsetflag (sock, brdg, "eth0", IFBIF_STP);
#endif
#endif
#ifdef CYGHWR_NET_DRIVER_ETH1
  interface_up("eth1");
  eth1_up = 1;
  bridge_add(sock,brdg,"eth1");
#ifdef CYGPKG_NET_BRIDGE_STP_CODE
  bridge_ifsetflag (sock, brdg, "eth1", IFBIF_STP);
#endif
#endif

  bridge_status(sock,brdg);
  bridge_setflag(sock,brdg, IFF_UP);

  while(1) {
    cyg_kmem_print_stats();
    cyg_thread_delay(500);
  }
}

static char main_stack[8192];
static cyg_handle_t main_handle;
static cyg_thread main_thread;

void
cyg_user_start(void) {
  printf("cyg_user_start starting\n");
  cyg_thread_create(4, &main_fn, 0, "main", &main_stack, sizeof(main_stack),
                    &main_handle, &main_thread);
  cyg_thread_resume(main_handle);
  printf("cyg_user_start done\n");
}

#else // CYGPKG_NET_BRIDGE_HANDLER

void
cyg_user_start(void) {
    printf("No bridge support available\n");
}
#endif