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[nat] Send a GSM 08.08 Reset Ack to the BSC...

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When the reset was filtered out to the MSC we will respond
with a GSM08.08 reset ack right away. We are using a static
acknowledge here.
This commit is contained in:
Holger Hans Peter Freyther
2010-01-30 12:45:10 +01:00
parent e7b9771c4d
commit 846457b10a
1 changed files with 23 additions and 2 deletions
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25
openbsc/src/nat/bsc_nat.c
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@@ -39,6 +39,7 @@
#include <openbsc/msgb.h>
#include <openbsc/bsc_msc.h>
#include <openbsc/bsc_nat.h>
#include <openbsc/bssap.h>
#include <openbsc/ipaccess.h>
#include <openbsc/abis_nm.h>
#include <openbsc/talloc.h>
@@ -86,6 +87,18 @@ int gsm0408_rcvmsg(struct msgb *msg, u_int8_t link_id)
return -1;
}
static int send_reset_ack(struct bsc_fd *bfd)
{
static const u_int8_t gsm_reset_ack[] = {
0x00, 0x13, 0xfd,
0x09, 0x00, 0x03, 0x07, 0x0b, 0x04, 0x43, 0x01,
0x00, 0xfe, 0x04, 0x43, 0x5c, 0x00, 0xfe, 0x03,
0x00, 0x01, 0x31,
};
return write(bfd->fd, gsm_reset_ack, sizeof(gsm_reset_ack));
}
/*
* Below is the handling of messages coming
* from the MSC and need to be forwarded to
@@ -177,7 +190,7 @@ static void remove_bsc_connection(struct bsc_connection *connection)
talloc_free(connection);
}
static int forward_sccp_to_msc(struct msgb *msg)
static int forward_sccp_to_msc(struct bsc_fd *bfd, struct msgb *msg)
{
struct bsc_nat_parsed *parsed;
int rc = -1;
@@ -194,8 +207,16 @@ static int forward_sccp_to_msc(struct msgb *msg)
/* send the non-filtered but maybe modified msg */
rc = write(msc_connection.fd, msg->data, msg->len);
talloc_free(parsed);
return rc;
exit:
/* if we filter out the reset send an ack to the BSC */
if (parsed->bssap == 0 && parsed->gsm_type == BSS_MAP_MSG_RESET) {
send_reset_ack(bfd);
send_reset_ack(bfd);
}
talloc_free(parsed);
return rc;
}
@@ -221,7 +242,7 @@ static int ipaccess_bsc_cb(struct bsc_fd *bfd, unsigned int what)
/* Handle messages from the BSC */
/* FIXME: Currently no PONG is sent to the BSC */
/* FIXME: Currently no ID ACK is sent to the BSC */
forward_sccp_to_msc(msg);
forward_sccp_to_msc(bfd, msg);
return 0;
}