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

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* 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
2010-03-30 09:17:53 +02:00
parent 18bbe2e8a0
commit 957bc93244
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 * SCCP patching and handling
*/ */
int create_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed); 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); 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 sccp_connections *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_msc(struct msgb *, struct bsc_nat_parsed *, struct bsc_nat *);
#endif #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) 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; struct bsc_nat_parsed *parsed;
/* filter, drop, patch the message? */ /* 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_RLSD:
case SCCP_MSG_TYPE_CREF: case SCCP_MSG_TYPE_CREF:
case SCCP_MSG_TYPE_DT1: 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; break;
case SCCP_MSG_TYPE_CC: 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; goto exit;
bsc = patch_sccp_src_ref_to_bsc(msg, parsed, nat);
break; break;
case SCCP_MSG_TYPE_RLC: case SCCP_MSG_TYPE_RLC:
LOGP(DNAT, LOGL_ERROR, "Unexpected release complete from MSC.\n"); 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); talloc_free(parsed);
if (!bsc) if (!con)
return -1; return -1;
if (!bsc->authenticated) { if (!con->bsc->authenticated) {
LOGP(DNAT, LOGL_ERROR, "Selected BSC not authenticated.\n"); LOGP(DNAT, LOGL_ERROR, "Selected BSC not authenticated.\n");
return -1; return -1;
} }
bsc_write(bsc, msg->data, msg->len); bsc_write(con->bsc, msg->data, msg->len);
return 0; return 0;
send_to_all: 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) 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; struct bsc_nat_parsed *parsed;
if (!bsc->authenticated) { 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: case SCCP_MSG_TYPE_CR:
if (create_sccp_src_ref(bsc, msg, parsed) != 0) if (create_sccp_src_ref(bsc, msg, parsed) != 0)
goto exit2; goto exit2;
found_bsc = patch_sccp_src_ref_to_msc(msg, parsed, nat); con = patch_sccp_src_ref_to_msc(msg, parsed, nat);
break; break;
case SCCP_MSG_TYPE_RLSD: case SCCP_MSG_TYPE_RLSD:
case SCCP_MSG_TYPE_CREF: case SCCP_MSG_TYPE_CREF:
case SCCP_MSG_TYPE_DT1: case SCCP_MSG_TYPE_DT1:
case SCCP_MSG_TYPE_CC: 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; break;
case SCCP_MSG_TYPE_RLC: 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); remove_sccp_src_ref(bsc, msg, parsed);
break; break;
case SCCP_MSG_TYPE_UDT: case SCCP_MSG_TYPE_UDT:
/* simply forward everything */ /* simply forward everything */
con = NULL;
break; break;
default: default:
LOGP(DNAT, LOGL_ERROR, "Not forwarding to msc sccp type: 0x%x\n", parsed->sccp_type); LOGP(DNAT, LOGL_ERROR, "Not forwarding to msc sccp type: 0x%x\n", parsed->sccp_type);
con = NULL;
goto exit2; goto exit2;
break; 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"); LOGP(DNAT, LOGL_ERROR, "Found the wrong entry.\n");
goto exit2; goto exit2;
} }

33
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; 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) { if (!parsed->dest_local_ref || !parsed->src_local_ref) {
LOGP(DNAT, LOGL_ERROR, "CC MSG should contain both local and dest address.\n"); LOGP(DNAT, LOGL_ERROR, "CC MSG should contain both local and dest address.\n");
return -1; return -1;
} }
llist_for_each_entry(conn, &bsc->nat->sccp_connections, list_entry) { sccp->remote_ref = *parsed->src_local_ref;
if (conn->bsc != bsc)
continue;
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", 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(&sccp->patched_ref),
sccp_src_ref_to_int(&conn->remote_ref), bsc); sccp_src_ref_to_int(&sccp->remote_ref), sccp->bsc);
return 0;
}
LOGP(DNAT, LOGL_ERROR, "Referenced connection not found on BSC: %p\n", bsc); return 0;
return -1;
} }
void remove_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed) void remove_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed)
@@ -165,7 +152,7 @@ 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 * an address that was assigned by the MUX, we need to update the
* dest reference to the real network. * dest reference to the real network.
*/ */
struct bsc_connection *patch_sccp_src_ref_to_bsc(struct msgb *msg, struct sccp_connections *patch_sccp_src_ref_to_bsc(struct msgb *msg,
struct bsc_nat_parsed *parsed, struct bsc_nat_parsed *parsed,
struct bsc_nat *nat) struct bsc_nat *nat)
{ {
@@ -183,7 +170,7 @@ struct bsc_connection *patch_sccp_src_ref_to_bsc(struct msgb *msg,
/* Change the dest address to the real one */ /* Change the dest address to the real one */
*parsed->dest_local_ref = conn->real_ref; *parsed->dest_local_ref = conn->real_ref;
return conn->bsc; return conn;
} }
return NULL; return NULL;
@@ -197,7 +184,7 @@ struct bsc_connection *patch_sccp_src_ref_to_bsc(struct msgb *msg,
* in all other cases we need to work by the destination local * in all other cases we need to work by the destination local
* reference.. * reference..
*/ */
struct bsc_connection *patch_sccp_src_ref_to_msc(struct msgb *msg, struct sccp_connections *patch_sccp_src_ref_to_msc(struct msgb *msg,
struct bsc_nat_parsed *parsed, struct bsc_nat_parsed *parsed,
struct bsc_nat *nat) struct bsc_nat *nat)
{ {
@@ -207,11 +194,11 @@ struct bsc_connection *patch_sccp_src_ref_to_msc(struct msgb *msg,
if (parsed->src_local_ref) { if (parsed->src_local_ref) {
if (equal(parsed->src_local_ref, &conn->real_ref)) { if (equal(parsed->src_local_ref, &conn->real_ref)) {
*parsed->src_local_ref = conn->patched_ref; *parsed->src_local_ref = conn->patched_ref;
return conn->bsc; return conn;
} }
} else if (parsed->dest_local_ref) { } else if (parsed->dest_local_ref) {
if (equal(parsed->dest_local_ref, &conn->remote_ref)) if (equal(parsed->dest_local_ref, &conn->remote_ref))
return conn->bsc; return conn;
} else { } else {
LOGP(DNAT, LOGL_ERROR, "Header has neither loc/dst ref.\n"); LOGP(DNAT, LOGL_ERROR, "Header has neither loc/dst ref.\n");
return NULL; 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) \ #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); \ fprintf(stderr, "Failed to find the con: %p\n", con_found); \
abort(); \ abort(); \
} \ } \
@@ -203,7 +203,8 @@ static void test_contrack()
{ {
int rc; int rc;
struct bsc_nat *nat; 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 bsc_nat_parsed *parsed;
struct msgb *msg; struct msgb *msg;
@@ -226,7 +227,7 @@ static void test_contrack()
abort(); abort();
} }
con_found = patch_sccp_src_ref_to_msc(msg, parsed, nat); 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); fprintf(stderr, "Failed to find the con: %p\n", con_found);
abort(); abort();
} }
@@ -239,12 +240,12 @@ static void test_contrack()
/* 2.) get the cc */ /* 2.) get the cc */
copy_to_msg(msg, msc_cc, sizeof(msc_cc)); copy_to_msg(msg, msc_cc, sizeof(msc_cc));
parsed = bsc_nat_parse(msg); 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"); fprintf(stderr, "Failed to update the SCCP con.\n");
abort(); 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 */ /* 3.) send some data */
copy_to_msg(msg, bsc_dtap, sizeof(bsc_dtap)); 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)); copy_to_msg(msg, bsc_rlc, sizeof(bsc_rlc));
parsed = bsc_nat_parse(msg); parsed = bsc_nat_parse(msg);
con_found = patch_sccp_src_ref_to_msc(msg, parsed, nat); 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); fprintf(stderr, "Failed to find the con: %p\n", con_found);
abort(); abort();
} }