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nat: Return the SCCP connection, change order of patching and updating 

* Return the SCCP connection. This will be needed to store the
  assigned timeslot in there.
* Update code to work with this change
* This uncovered a bug in the CC handling, at the time the BSC was
  passed it was still a null pointer and the code would have failed.
This commit is contained in:
Holger Hans Peter Freyther 2010-06-15 18:48:55 +08:00
parent 72ba1624b3
commit 49c7fb52f0
4 changed files with 44 additions and 50 deletions
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6
openbsc/include/openbsc/bsc_nat.h
View File

@ -156,9 +156,9 @@ struct bsc_connection *bsc_nat_find_bsc(struct bsc_nat *nat, struct msgb *msg);
* SCCP patching and handling
*/
int create_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed);
int update_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed);
int update_sccp_src_ref(struct sccp_connections *sccp, struct bsc_nat_parsed *parsed);
void remove_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed);
struct bsc_connection *patch_sccp_src_ref_to_bsc(struct msgb *, struct bsc_nat_parsed *, struct bsc_nat *);
struct bsc_connection *patch_sccp_src_ref_to_msc(struct msgb *, struct bsc_nat_parsed *, struct bsc_nat *);
struct sccp_connections *patch_sccp_src_ref_to_bsc(struct msgb *, struct bsc_nat_parsed *, struct bsc_nat *);
struct sccp_connections *patch_sccp_src_ref_to_msc(struct msgb *, struct bsc_nat_parsed *, struct bsc_nat *);
#endif

30
openbsc/src/nat/bsc_nat.c
View File

@ -168,7 +168,8 @@ static void bsc_write(struct bsc_connection *bsc, const u_int8_t *data, unsigned
static int forward_sccp_to_bts(struct msgb *msg)
{
struct bsc_connection *bsc = NULL;
struct sccp_connections *con;
struct bsc_connection *bsc;
struct bsc_nat_parsed *parsed;
/* filter, drop, patch the message? */
@ -191,12 +192,12 @@ static int forward_sccp_to_bts(struct msgb *msg)
case SCCP_MSG_TYPE_RLSD:
case SCCP_MSG_TYPE_CREF:
case SCCP_MSG_TYPE_DT1:
bsc = patch_sccp_src_ref_to_bsc(msg, parsed, nat);
con = patch_sccp_src_ref_to_bsc(msg, parsed, nat);
break;
case SCCP_MSG_TYPE_CC:
if (update_sccp_src_ref(bsc, msg, parsed) != 0)
con = patch_sccp_src_ref_to_bsc(msg, parsed, nat);
if (!con || update_sccp_src_ref(con, parsed) != 0)
goto exit;
bsc = patch_sccp_src_ref_to_bsc(msg, parsed, nat);
break;
case SCCP_MSG_TYPE_RLC:
LOGP(DNAT, LOGL_ERROR, "Unexpected release complete from MSC.\n");
@ -210,14 +211,14 @@ static int forward_sccp_to_bts(struct msgb *msg)
}
talloc_free(parsed);
if (!bsc)
if (!con)
return -1;
if (!bsc->authenticated) {
if (!con->bsc->authenticated) {
LOGP(DNAT, LOGL_ERROR, "Selected BSC not authenticated.\n");
return -1;
}
bsc_write(bsc, msg->data, msg->len);
bsc_write(con->bsc, msg->data, msg->len);
return 0;
send_to_all:
@ -365,7 +366,7 @@ static void ipaccess_auth_bsc(struct tlv_parsed *tvp, struct bsc_connection *bsc
static int forward_sccp_to_msc(struct bsc_connection *bsc, struct msgb *msg)
{
struct bsc_connection *found_bsc = NULL;
struct sccp_connections *con;
struct bsc_nat_parsed *parsed;
if (!bsc->authenticated) {
@ -391,29 +392,34 @@ static int forward_sccp_to_msc(struct bsc_connection *bsc, struct msgb *msg)
case SCCP_MSG_TYPE_CR:
if (create_sccp_src_ref(bsc, msg, parsed) != 0)
goto exit2;
found_bsc = patch_sccp_src_ref_to_msc(msg, parsed, nat);
con = patch_sccp_src_ref_to_msc(msg, parsed, nat);
break;
case SCCP_MSG_TYPE_RLSD:
case SCCP_MSG_TYPE_CREF:
case SCCP_MSG_TYPE_DT1:
case SCCP_MSG_TYPE_CC:
found_bsc = patch_sccp_src_ref_to_msc(msg, parsed, nat);
con = patch_sccp_src_ref_to_msc(msg, parsed, nat);
break;
case SCCP_MSG_TYPE_RLC:
found_bsc = patch_sccp_src_ref_to_msc(msg, parsed, nat);
con = patch_sccp_src_ref_to_msc(msg, parsed, nat);
remove_sccp_src_ref(bsc, msg, parsed);
break;
case SCCP_MSG_TYPE_UDT:
/* simply forward everything */
con = NULL;
break;
default:
LOGP(DNAT, LOGL_ERROR, "Not forwarding to msc sccp type: 0x%x\n", parsed->sccp_type);
con = NULL;
goto exit2;
break;
}
} else {
LOGP(DNAT, LOGL_ERROR, "Not forwarding unknown stream id: 0x%x\n", parsed->ipa_proto);
goto exit2;
}
if (found_bsc != bsc) {
if (con && con->bsc != bsc) {
LOGP(DNAT, LOGL_ERROR, "Found the wrong entry.\n");
goto exit2;
}

43
openbsc/src/nat/bsc_sccp.c
View File

@ -108,32 +108,19 @@ int create_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc
return 0;
}
int update_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed)
int update_sccp_src_ref(struct sccp_connections *sccp, struct bsc_nat_parsed *parsed)
{
struct sccp_connections *conn;
if (!parsed->dest_local_ref || !parsed->src_local_ref) {
LOGP(DNAT, LOGL_ERROR, "CC MSG should contain both local and dest address.\n");
return -1;
}
llist_for_each_entry(conn, &bsc->nat->sccp_connections, list_entry) {
if (conn->bsc != bsc)
continue;
sccp->remote_ref = *parsed->src_local_ref;
LOGP(DNAT, LOGL_DEBUG, "Updating 0x%x to remote 0x%x on %p\n",
sccp_src_ref_to_int(&sccp->patched_ref),
sccp_src_ref_to_int(&sccp->remote_ref), sccp->bsc);
if (memcmp(parsed->dest_local_ref,
&conn->patched_ref, sizeof(conn->patched_ref)) != 0)
continue;
conn->remote_ref = *parsed->src_local_ref;
LOGP(DNAT, LOGL_DEBUG, "Updating 0x%x to remote 0x%x on %p\n",
sccp_src_ref_to_int(&conn->patched_ref),
sccp_src_ref_to_int(&conn->remote_ref), bsc);
return 0;
}
LOGP(DNAT, LOGL_ERROR, "Referenced connection not found on BSC: %p\n", bsc);
return -1;
return 0;
}
void remove_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed)
@ -165,9 +152,9 @@ void remove_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bs
* an address that was assigned by the MUX, we need to update the
* dest reference to the real network.
*/
struct bsc_connection *patch_sccp_src_ref_to_bsc(struct msgb *msg,
struct bsc_nat_parsed *parsed,
struct bsc_nat *nat)
struct sccp_connections *patch_sccp_src_ref_to_bsc(struct msgb *msg,
struct bsc_nat_parsed *parsed,
struct bsc_nat *nat)
{
struct sccp_connections *conn;
@ -183,7 +170,7 @@ struct bsc_connection *patch_sccp_src_ref_to_bsc(struct msgb *msg,
/* Change the dest address to the real one */
*parsed->dest_local_ref = conn->real_ref;
return conn->bsc;
return conn;
}
return NULL;
@ -197,9 +184,9 @@ struct bsc_connection *patch_sccp_src_ref_to_bsc(struct msgb *msg,
* in all other cases we need to work by the destination local
* reference..
*/
struct bsc_connection *patch_sccp_src_ref_to_msc(struct msgb *msg,
struct bsc_nat_parsed *parsed,
struct bsc_nat *nat)
struct sccp_connections *patch_sccp_src_ref_to_msc(struct msgb *msg,
struct bsc_nat_parsed *parsed,
struct bsc_nat *nat)
{
struct sccp_connections *conn;
@ -207,11 +194,11 @@ struct bsc_connection *patch_sccp_src_ref_to_msc(struct msgb *msg,
if (parsed->src_local_ref) {
if (equal(parsed->src_local_ref, &conn->real_ref)) {
*parsed->src_local_ref = conn->patched_ref;
return conn->bsc;
return conn;
}
} else if (parsed->dest_local_ref) {
if (equal(parsed->dest_local_ref, &conn->remote_ref))
return conn->bsc;
return conn;
} else {
LOGP(DNAT, LOGL_ERROR, "Header has neither loc/dst ref.\n");
return NULL;

15
openbsc/tests/bsc-nat/bsc_nat_test.c
View File

@ -189,7 +189,7 @@ static void copy_to_msg(struct msgb *msg, const u_int8_t *data, unsigned int len
}
#define VERIFY(con_found, con, msg, ver, str) \
if (con_found != con) { \
if (!con_found || con_found->bsc != con) { \
fprintf(stderr, "Failed to find the con: %p\n", con_found); \
abort(); \
} \
@ -203,7 +203,8 @@ static void test_contrack()
{
int rc;
struct bsc_nat *nat;
struct bsc_connection *con, *con_found;
struct bsc_connection *con;
struct sccp_connections *con_found;
struct bsc_nat_parsed *parsed;
struct msgb *msg;
@ -226,7 +227,7 @@ static void test_contrack()
abort();
}
con_found = patch_sccp_src_ref_to_msc(msg, parsed, nat);
if (con_found != con) {
if (!con_found || con_found->bsc != con) {
fprintf(stderr, "Failed to find the con: %p\n", con_found);
abort();
}
@ -239,12 +240,12 @@ static void test_contrack()
/* 2.) get the cc */
copy_to_msg(msg, msc_cc, sizeof(msc_cc));
parsed = bsc_nat_parse(msg);
if (update_sccp_src_ref(con, msg, parsed) != 0) {
con_found = patch_sccp_src_ref_to_bsc(msg, parsed, nat);
VERIFY(con_found, con, msg, msc_cc_patched, "MSC CC");
if (update_sccp_src_ref(con_found, parsed) != 0) {
fprintf(stderr, "Failed to update the SCCP con.\n");
abort();
}
con_found = patch_sccp_src_ref_to_bsc(msg, parsed, nat);
VERIFY(con_found, con, msg, msc_cc_patched, "MSC CC");
/* 3.) send some data */
copy_to_msg(msg, bsc_dtap, sizeof(bsc_dtap));
@ -268,7 +269,7 @@ static void test_contrack()
copy_to_msg(msg, bsc_rlc, sizeof(bsc_rlc));
parsed = bsc_nat_parse(msg);
con_found = patch_sccp_src_ref_to_msc(msg, parsed, nat);
if (con_found != con) {
if (!con_found || con_found->bsc != con) {
fprintf(stderr, "Failed to find the con: %p\n", con_found);
abort();
}