nat: Move the DTAP unpacking into a new method
DTAP unpacking will be used by the USSD checking code
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@ -32,6 +32,7 @@
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#include <osmocore/write_queue.h>
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#include <osmocore/rate_ctr.h>
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#include <osmocore/statistics.h>
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#include <osmocore/protocol/gsm_04_08.h>
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#include <regex.h>
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@ -315,4 +316,6 @@ int bsc_nat_msc_is_connected(struct bsc_nat *nat);
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int bsc_conn_type_to_ctr(struct sccp_connections *conn);
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struct gsm48_hdr *bsc_unpack_dtap(struct bsc_nat_parsed *parsed, struct msgb *msg, uint32_t *len);
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#endif
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@ -549,6 +549,25 @@ int bsc_nat_filter_sccp_cr(struct bsc_connection *bsc, struct msgb *msg,
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}
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}
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struct gsm48_hdr *bsc_unpack_dtap(struct bsc_nat_parsed *parsed,
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struct msgb *msg, uint32_t *len)
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{
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/* gsm_type is actually the size of the dtap */
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*len = parsed->gsm_type;
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if (*len < msgb_l3len(msg) - 3) {
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LOGP(DNAT, LOGL_ERROR, "Not enough space for DTAP.\n");
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return NULL;
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}
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if (*len < sizeof(struct gsm48_hdr)) {
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LOGP(DNAT, LOGL_ERROR, "GSM48 header does not fit.\n");
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return NULL;
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}
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msg->l4h = &msg->l3h[3];
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return (struct gsm48_hdr *) msg->l4h;
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}
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int bsc_nat_filter_dt(struct bsc_connection *bsc, struct msgb *msg,
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struct sccp_connections *con, struct bsc_nat_parsed *parsed)
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{
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@ -563,20 +582,9 @@ int bsc_nat_filter_dt(struct bsc_connection *bsc, struct msgb *msg,
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if (parsed->bssap != BSSAP_MSG_DTAP)
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return 0;
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/* gsm_type is actually the size of the dtap */
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len = parsed->gsm_type;
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if (len < msgb_l3len(msg) - 3) {
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LOGP(DNAT, LOGL_ERROR, "Not enough space for DTAP.\n");
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hdr48 = bsc_unpack_dtap(parsed, msg, &len);
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if (!hdr48)
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return -1;
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}
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if (len < sizeof(*hdr48)) {
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LOGP(DNAT, LOGL_ERROR, "GSM48 header does not fit.\n");
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return -1;
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}
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msg->l4h = &msg->l3h[3];
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hdr48 = (struct gsm48_hdr *) msg->l4h;
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msg_type = hdr48->msg_type & 0xbf;
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if (hdr48->proto_discr == GSM48_PDISC_MM &&
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