| /* GTP Hub Implementation */ |
| |
| /* (C) 2015 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| * All Rights Reserved |
| * |
| * Author: Neels Hofmeyr |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Affero General Public License as published by |
| * the Free Software Foundation; either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Affero General Public License for more details. |
| * |
| * You should have received a copy of the GNU Affero General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <string.h> |
| #include <errno.h> |
| #include <inttypes.h> |
| #include <time.h> |
| #include <limits.h> |
| #include <unistd.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| |
| #include <gtp.h> |
| #include <gtpie.h> |
| |
| #include <openbsc/gtphub.h> |
| #include <openbsc/debug.h> |
| #include <openbsc/gprs_utils.h> |
| |
| #include <osmocom/core/utils.h> |
| #include <osmocom/core/logging.h> |
| #include <osmocom/core/socket.h> |
| #include <osmocom/core/rate_ctr.h> |
| #include <osmocom/core/stats.h> |
| |
| |
| static const int GTPH_GC_TICK_SECONDS = 1; |
| |
| void *osmo_gtphub_ctx; |
| |
| /* Convenience makro, note: only within this C file. */ |
| #define LOG(level, fmt, args...) \ |
| LOGP(DGTPHUB, level, fmt, ##args) |
| |
| #define ZERO_STRUCT(struct_pointer) memset(struct_pointer, '\0', \ |
| sizeof(*(struct_pointer))) |
| |
| /* TODO move this to osmocom/core/select.h ? */ |
| typedef int (*osmo_fd_cb_t)(struct osmo_fd *fd, unsigned int what); |
| |
| /* TODO move this to osmocom/core/linuxlist.h ? */ |
| #define __llist_first(head) (((head)->next == (head)) ? NULL : (head)->next) |
| #define llist_first(head, type, entry) \ |
| llist_entry(__llist_first(head), type, entry) |
| |
| #define __llist_last(head) (((head)->next == (head)) ? NULL : (head)->prev) |
| #define llist_last(head, type, entry) \ |
| llist_entry(__llist_last(head), type, entry) |
| |
| /* TODO move GTP header stuff to openggsn/gtp/ ? See gtp_decaps*() */ |
| |
| enum gtp_rc { |
| GTP_RC_UNKNOWN = 0, |
| GTP_RC_TINY = 1, /* no IEs (like ping/pong) */ |
| GTP_RC_PDU_C = 2, /* a real packet with IEs */ |
| GTP_RC_PDU_U = 3, /* a real packet with User data */ |
| |
| GTP_RC_TOOSHORT = -1, |
| GTP_RC_UNSUPPORTED_VERSION = -2, |
| GTP_RC_INVALID_IE = -3, |
| }; |
| |
| struct gtp_packet_desc { |
| union gtp_packet *data; |
| int data_len; |
| int header_len; |
| int version; |
| uint8_t type; |
| uint16_t seq; |
| uint32_t header_tei_rx; |
| uint32_t header_tei; |
| int rc; /* enum gtp_rc */ |
| unsigned int plane_idx; |
| unsigned int side_idx; |
| struct gtphub_tunnel *tun; |
| time_t timestamp; |
| union gtpie_member *ie[GTPIE_SIZE]; |
| }; |
| |
| struct pending_delete { |
| struct llist_head entry; |
| struct expiring_item expiry_entry; |
| |
| struct gtphub_tunnel *tun; |
| uint8_t teardown_ind; |
| uint8_t nsapi; |
| }; |
| |
| |
| /* counters */ |
| |
| enum gtphub_counters_io { |
| GTPH_CTR_PKTS_IN = 0, |
| GTPH_CTR_PKTS_OUT, |
| GTPH_CTR_BYTES_IN, |
| GTPH_CTR_BYTES_OUT |
| }; |
| |
| static const struct rate_ctr_desc gtphub_counters_io_desc[] = { |
| { "packets.in", "Packets ( In)" }, |
| { "packets.out", "Packets (Out)" }, |
| { "bytes.in", "Bytes ( In)" }, |
| { "bytes.out", "Bytes (Out)" }, |
| }; |
| |
| static const struct rate_ctr_group_desc gtphub_ctrg_io_desc = { |
| .group_name_prefix = "gtphub.bind", |
| .group_description = "I/O Statistics", |
| .num_ctr = ARRAY_SIZE(gtphub_counters_io_desc), |
| .ctr_desc = gtphub_counters_io_desc, |
| .class_id = OSMO_STATS_CLASS_GLOBAL, |
| }; |
| |
| |
| /* support */ |
| |
| static const char *gtp_type_str(uint8_t type) |
| { |
| switch (type) { |
| case 1: |
| return " (Echo Request)"; |
| case 2: |
| return " (Echo Response)"; |
| case 16: |
| return " (Create PDP Ctx Request)"; |
| case 17: |
| return " (Create PDP Ctx Response)"; |
| case 18: |
| return " (Update PDP Ctx Request)"; |
| case 19: |
| return " (Update PDP Ctx Response)"; |
| case 20: |
| return " (Delete PDP Ctx Request)"; |
| case 21: |
| return " (Delete PDP Ctx Response)"; |
| case 255: |
| return " (User Data)"; |
| default: |
| return ""; |
| } |
| } |
| |
| void gsn_addr_copy(struct gsn_addr *gsna, const struct gsn_addr *src) |
| { |
| *gsna = *src; |
| } |
| |
| int gsn_addr_from_sockaddr(struct gsn_addr *gsna, uint16_t *port, |
| const struct osmo_sockaddr *sa) |
| { |
| char addr_str[256]; |
| char port_str[6]; |
| |
| if (osmo_sockaddr_to_strs(addr_str, sizeof(addr_str), |
| port_str, sizeof(port_str), |
| sa, (NI_NUMERICHOST | NI_NUMERICSERV)) |
| != 0) { |
| return -1; |
| } |
| |
| if (port) |
| *port = atoi(port_str); |
| |
| return gsn_addr_from_str(gsna, addr_str); |
| } |
| |
| int gsn_addr_from_str(struct gsn_addr *gsna, const char *numeric_addr_str) |
| { |
| if ((!gsna) || (!numeric_addr_str)) |
| return -1; |
| |
| int af = AF_INET; |
| gsna->len = 4; |
| const char *pos = numeric_addr_str; |
| for (; *pos; pos++) { |
| if (*pos == ':') { |
| af = AF_INET6; |
| gsna->len = 16; |
| break; |
| } |
| } |
| |
| int rc = inet_pton(af, numeric_addr_str, gsna->buf); |
| if (rc != 1) { |
| LOG(LOGL_ERROR, "Cannot resolve numeric address: '%s'\n", |
| numeric_addr_str); |
| return -1; |
| } |
| return 0; |
| } |
| |
| const char *gsn_addr_to_str(const struct gsn_addr *gsna) |
| { |
| static char buf[INET6_ADDRSTRLEN + 1]; |
| return gsn_addr_to_strb(gsna, buf, sizeof(buf)); |
| } |
| |
| const char *gsn_addr_to_strb(const struct gsn_addr *gsna, |
| char *strbuf, |
| int strbuf_len) |
| { |
| int af; |
| switch (gsna->len) { |
| case 4: |
| af = AF_INET; |
| break; |
| case 16: |
| af = AF_INET6; |
| break; |
| default: |
| return NULL; |
| } |
| |
| const char *r = inet_ntop(af, gsna->buf, strbuf, strbuf_len); |
| if (!r) { |
| LOG(LOGL_ERROR, "Cannot convert gsn_addr to string:" |
| " %s: len=%d, buf=%s\n", |
| strerror(errno), |
| (int)gsna->len, |
| osmo_hexdump(gsna->buf, sizeof(gsna->buf))); |
| } |
| return r; |
| } |
| |
| int gsn_addr_same(const struct gsn_addr *a, const struct gsn_addr *b) |
| { |
| if (a == b) |
| return 1; |
| if ((!a) || (!b)) |
| return 0; |
| if (a->len != b->len) |
| return 0; |
| return (memcmp(a->buf, b->buf, a->len) == 0)? 1 : 0; |
| } |
| |
| static int gsn_addr_get(struct gsn_addr *gsna, const struct gtp_packet_desc *p, |
| int idx) |
| { |
| if (p->rc != GTP_RC_PDU_C) |
| return -1; |
| |
| unsigned int len; |
| /* gtpie.h fails to declare gtpie_gettlv()'s first arg as const. */ |
| if (gtpie_gettlv((union gtpie_member**)p->ie, GTPIE_GSN_ADDR, idx, |
| &len, gsna->buf, sizeof(gsna->buf)) |
| != 0) |
| return -1; |
| gsna->len = len; |
| return 0; |
| } |
| |
| static int gsn_addr_put(const struct gsn_addr *gsna, struct gtp_packet_desc *p, |
| int idx) |
| { |
| if (p->rc != GTP_RC_PDU_C) |
| return -1; |
| |
| int ie_idx; |
| ie_idx = gtpie_getie(p->ie, GTPIE_GSN_ADDR, idx); |
| |
| if (ie_idx < 0) |
| return -1; |
| |
| struct gtpie_tlv *ie = &p->ie[ie_idx]->tlv; |
| int ie_l = ntoh16(ie->l); |
| if (ie_l != gsna->len) { |
| LOG(LOGL_ERROR, "Not implemented:" |
| " replace an IE address of different size:" |
| " replace %d with %d\n", (int)ie_l, (int)gsna->len); |
| return -1; |
| } |
| |
| memcpy(ie->v, gsna->buf, (int)ie_l); |
| return 0; |
| } |
| |
| /* Validate GTP version 0 data; analogous to validate_gtp1_header(), see there. |
| */ |
| void validate_gtp0_header(struct gtp_packet_desc *p) |
| { |
| const struct gtp0_header *pheader = &(p->data->gtp0.h); |
| p->rc = GTP_RC_UNKNOWN; |
| p->header_len = 0; |
| |
| OSMO_ASSERT(p->data_len >= 1); |
| OSMO_ASSERT(p->version == 0); |
| |
| if (p->data_len < GTP0_HEADER_SIZE) { |
| LOG(LOGL_ERROR, "GTP0 packet too short: %d\n", p->data_len); |
| p->rc = GTP_RC_TOOSHORT; |
| return; |
| } |
| |
| p->type = ntoh8(pheader->type); |
| p->seq = ntoh16(pheader->seq); |
| p->header_tei_rx = 0; /* TODO */ |
| p->header_tei = p->header_tei_rx; |
| |
| if (p->data_len == GTP0_HEADER_SIZE) { |
| p->rc = GTP_RC_TINY; |
| p->header_len = GTP0_HEADER_SIZE; |
| return; |
| } |
| |
| /* Check packet length field versus length of packet */ |
| if (p->data_len != (ntoh16(pheader->length) + GTP0_HEADER_SIZE)) { |
| LOG(LOGL_ERROR, "GTP packet length field (%d + %d) does not" |
| " match actual length (%d)\n", |
| GTP0_HEADER_SIZE, (int)ntoh16(pheader->length), |
| p->data_len); |
| p->rc = GTP_RC_TOOSHORT; |
| return; |
| } |
| |
| LOG(LOGL_DEBUG, "GTP v0 TID = %" PRIu64 "\n", pheader->tid); |
| p->header_len = GTP0_HEADER_SIZE; |
| p->rc = GTP_RC_PDU_C; |
| } |
| |
| /* Validate GTP version 1 data, and update p->rc with the result, as well as |
| * p->header_len in case of a valid header. */ |
| void validate_gtp1_header(struct gtp_packet_desc *p) |
| { |
| const struct gtp1_header_long *pheader = &(p->data->gtp1l.h); |
| p->rc = GTP_RC_UNKNOWN; |
| p->header_len = 0; |
| |
| OSMO_ASSERT(p->data_len >= 1); |
| OSMO_ASSERT(p->version == 1); |
| |
| if ((p->data_len < GTP1_HEADER_SIZE_LONG) |
| && (p->data_len != GTP1_HEADER_SIZE_SHORT)){ |
| LOG(LOGL_ERROR, "GTP packet too short: %d\n", p->data_len); |
| p->rc = GTP_RC_TOOSHORT; |
| return; |
| } |
| |
| p->type = ntoh8(pheader->type); |
| p->header_tei_rx = ntoh32(pheader->tei); |
| p->header_tei = p->header_tei_rx; |
| p->seq = ntoh16(pheader->seq); |
| |
| LOG(LOGL_DEBUG, "| GTPv1\n"); |
| LOG(LOGL_DEBUG, "| type = %" PRIu8 " 0x%02" PRIx8 "\n", p->type, p->type); |
| LOG(LOGL_DEBUG, "| length = %" PRIu16 " 0x%04" PRIx16 "\n", ntoh16(pheader->length), ntoh16(pheader->length)); |
| LOG(LOGL_DEBUG, "| TEI = %" PRIu32 " 0x%08" PRIx32 "\n", p->header_tei_rx, p->header_tei_rx); |
| LOG(LOGL_DEBUG, "| seq = %" PRIu16 " 0x%04" PRIx16 "\n", p->seq, p->seq); |
| LOG(LOGL_DEBUG, "| npdu = %" PRIu8 " 0x%02" PRIx8 "\n", pheader->npdu, pheader->npdu); |
| LOG(LOGL_DEBUG, "| next = %" PRIu8 " 0x%02" PRIx8 "\n", pheader->next, pheader->next); |
| |
| if (p->data_len <= GTP1_HEADER_SIZE_LONG) { |
| p->rc = GTP_RC_TINY; |
| p->header_len = GTP1_HEADER_SIZE_SHORT; |
| return; |
| } |
| |
| /* Check packet length field versus length of packet */ |
| int announced_len = ntoh16(pheader->length) + GTP1_HEADER_SIZE_SHORT; |
| if (p->data_len != announced_len) { |
| LOG(LOGL_ERROR, "GTP packet length field (%d + %d) does not" |
| " match actual length (%d)\n", |
| GTP1_HEADER_SIZE_SHORT, (int)ntoh16(pheader->length), |
| p->data_len); |
| p->rc = GTP_RC_TOOSHORT; |
| return; |
| } |
| |
| p->rc = GTP_RC_PDU_C; |
| p->header_len = GTP1_HEADER_SIZE_LONG; |
| } |
| |
| /* Examine whether p->data of size p->data_len has a valid GTP header. Set |
| * p->version, p->rc and p->header_len. On error, p->rc <= 0 (see enum |
| * gtp_rc). p->data must point at a buffer with p->data_len set. */ |
| void validate_gtp_header(struct gtp_packet_desc *p) |
| { |
| p->rc = GTP_RC_UNKNOWN; |
| |
| /* Need at least 1 byte in order to check version */ |
| if (p->data_len < 1) { |
| LOG(LOGL_ERROR, "Discarding packet - too small: %d\n", |
| p->data_len); |
| p->rc = GTP_RC_TOOSHORT; |
| return; |
| } |
| |
| p->version = p->data->flags >> 5; |
| |
| switch (p->version) { |
| case 0: |
| validate_gtp0_header(p); |
| break; |
| case 1: |
| validate_gtp1_header(p); |
| break; |
| default: |
| LOG(LOGL_ERROR, "Unsupported GTP version: %d\n", p->version); |
| p->rc = GTP_RC_UNSUPPORTED_VERSION; |
| break; |
| } |
| } |
| |
| |
| /* Return the value of the i'th IMSI IEI by copying to *imsi. |
| * The first IEI is reached by passing i = 0. |
| * imsi must point at allocated space of (at least) 8 bytes. |
| * Return 1 on success, or 0 if not found. */ |
| static int get_ie_imsi(union gtpie_member *ie[], int i, uint8_t *imsi) |
| { |
| return gtpie_gettv0(ie, GTPIE_IMSI, i, imsi, 8) == 0; |
| } |
| |
| /* Analogous to get_ie_imsi(). nsapi must point at a single uint8_t. */ |
| static int get_ie_nsapi(union gtpie_member *ie[], int i, uint8_t *nsapi) |
| { |
| return gtpie_gettv1(ie, GTPIE_NSAPI, i, nsapi) == 0; |
| } |
| |
| static char imsi_digit_to_char(uint8_t nibble) |
| { |
| nibble &= 0x0f; |
| if (nibble > 9) |
| return (nibble == 0x0f) ? '\0' : '?'; |
| return '0' + nibble; |
| } |
| |
| /* Return a human readable IMSI string, in a static buffer. |
| * imsi must point at 8 octets of IMSI IE encoded IMSI data. */ |
| static int imsi_to_str(uint8_t *imsi, const char **imsi_str) |
| { |
| static char str[17]; |
| int i; |
| |
| for (i = 0; i < 8; i++) { |
| char c; |
| c = imsi_digit_to_char(imsi[i]); |
| if (c == '?') |
| return -1; |
| str[2*i] = c; |
| |
| c = imsi_digit_to_char(imsi[i] >> 4); |
| if (c == '?') |
| return -1; |
| str[2*i + 1] = c; |
| } |
| str[16] = '\0'; |
| *imsi_str = str; |
| return 1; |
| } |
| |
| /* Return 0 if not present, 1 if present and decoded successfully, -1 if |
| * present but cannot be decoded. */ |
| static int get_ie_imsi_str(union gtpie_member *ie[], int i, |
| const char **imsi_str) |
| { |
| uint8_t imsi_buf[8]; |
| if (!get_ie_imsi(ie, i, imsi_buf)) |
| return 0; |
| return imsi_to_str(imsi_buf, imsi_str); |
| } |
| |
| /* Return 0 if not present, 1 if present and decoded successfully, -1 if |
| * present but cannot be decoded. */ |
| static int get_ie_apn_str(union gtpie_member *ie[], const char **apn_str) |
| { |
| static char apn_buf[GSM_APN_LENGTH]; |
| unsigned int len; |
| if (gtpie_gettlv(ie, GTPIE_APN, 0, |
| &len, apn_buf, sizeof(apn_buf)) != 0) |
| return 0; |
| |
| if (len < 2) { |
| LOG(LOGL_ERROR, "APN IE: invalid length: %d\n", |
| (int)len); |
| return -1; |
| } |
| |
| if (len > (sizeof(apn_buf) - 1)) |
| len = sizeof(apn_buf) - 1; |
| apn_buf[len] = '\0'; |
| |
| *apn_str = gprs_apn_to_str(apn_buf, (uint8_t*)apn_buf, len); |
| if (!(*apn_str)) { |
| LOG(LOGL_ERROR, "APN IE: present but cannot be decoded: %s\n", |
| osmo_hexdump((uint8_t*)apn_buf, len)); |
| return -1; |
| } |
| return 1; |
| } |
| |
| |
| /* Validate header, and index information elements. Write decoded packet |
| * information to *res. res->data will point at the given data buffer. On |
| * error, p->rc is set <= 0 (see enum gtp_rc). */ |
| static void gtp_decode(const uint8_t *data, int data_len, |
| unsigned int from_side_idx, |
| unsigned int from_plane_idx, |
| struct gtp_packet_desc *res, |
| time_t now) |
| { |
| ZERO_STRUCT(res); |
| res->data = (union gtp_packet*)data; |
| res->data_len = data_len; |
| res->side_idx = from_side_idx; |
| res->plane_idx = from_plane_idx; |
| res->timestamp = now; |
| |
| validate_gtp_header(res); |
| |
| if (res->rc <= 0) |
| return; |
| |
| LOG(LOGL_DEBUG, "Valid GTP header (v%d)\n", res->version); |
| |
| if (from_plane_idx == GTPH_PLANE_USER) { |
| res->rc = GTP_RC_PDU_U; |
| return; |
| } |
| |
| if (res->rc != GTP_RC_PDU_C) { |
| LOG(LOGL_DEBUG, "no IEs in this GTP packet\n"); |
| return; |
| } |
| |
| if (gtpie_decaps(res->ie, res->version, |
| (void*)(data + res->header_len), |
| res->data_len - res->header_len) != 0) { |
| res->rc = GTP_RC_INVALID_IE; |
| LOG(LOGL_ERROR, "INVALID: cannot decode IEs." |
| " Dropping GTP packet%s.\n", |
| gtp_type_str(res->type) |
| ); |
| return; |
| } |
| |
| #if 1 |
| /* TODO if (<loglevel is debug>) { ... |
| (waiting for a commit from jerlbeck) */ |
| int i; |
| |
| for (i = 0; i < 10; i++) { |
| const char *imsi; |
| if (get_ie_imsi_str(res->ie, i, &imsi) < 1) |
| break; |
| LOG(LOGL_DEBUG, "| IMSI %s\n", imsi); |
| } |
| |
| for (i = 0; i < 10; i++) { |
| uint8_t nsapi; |
| if (!get_ie_nsapi(res->ie, i, &nsapi)) |
| break; |
| LOG(LOGL_DEBUG, "| NSAPI %d\n", (int)nsapi); |
| } |
| |
| for (i = 0; i < 2; i++) { |
| struct gsn_addr addr; |
| if (gsn_addr_get(&addr, res, i) == 0) |
| LOG(LOGL_DEBUG, "| addr %s\n", gsn_addr_to_str(&addr)); |
| } |
| |
| for (i = 0; i < 10; i++) { |
| uint32_t tei; |
| if (gtpie_gettv4(res->ie, GTPIE_TEI_DI, i, &tei) != 0) |
| break; |
| LOG(LOGL_DEBUG, "| TEI DI (USER) %" PRIu32 " 0x%08" PRIx32 "\n", |
| tei, tei); |
| } |
| |
| for (i = 0; i < 10; i++) { |
| uint32_t tei; |
| if (gtpie_gettv4(res->ie, GTPIE_TEI_C, i, &tei) != 0) |
| break; |
| LOG(LOGL_DEBUG, "| TEI (CTRL) %" PRIu32 " 0x%08" PRIx32 "\n", |
| tei, tei); |
| } |
| #endif |
| } |
| |
| |
| /* expiry */ |
| |
| void expiry_init(struct expiry *exq, int expiry_in_seconds) |
| { |
| ZERO_STRUCT(exq); |
| exq->expiry_in_seconds = expiry_in_seconds; |
| INIT_LLIST_HEAD(&exq->items); |
| } |
| |
| void expiry_add(struct expiry *exq, struct expiring_item *item, time_t now) |
| { |
| item->expiry = now + exq->expiry_in_seconds; |
| |
| OSMO_ASSERT(llist_empty(&exq->items) |
| || (item->expiry |
| >= llist_last(&exq->items, struct expiring_item, entry)->expiry)); |
| |
| /* Add/move to the tail to always sort by expiry, ascending. */ |
| llist_del(&item->entry); |
| llist_add_tail(&item->entry, &exq->items); |
| } |
| |
| int expiry_tick(struct expiry *exq, time_t now) |
| { |
| int expired = 0; |
| struct expiring_item *m, *n; |
| llist_for_each_entry_safe(m, n, &exq->items, entry) { |
| if (m->expiry <= now) { |
| expiring_item_del(m); |
| expired ++; |
| } else { |
| /* The items are added sorted by expiry. So when we hit |
| * an unexpired entry, only more unexpired ones will |
| * follow. */ |
| break; |
| } |
| } |
| return expired; |
| } |
| |
| void expiry_clear(struct expiry *exq) |
| { |
| struct expiring_item *m, *n; |
| llist_for_each_entry_safe(m, n, &exq->items, entry) { |
| expiring_item_del(m); |
| } |
| } |
| |
| void expiring_item_init(struct expiring_item *item) |
| { |
| ZERO_STRUCT(item); |
| INIT_LLIST_HEAD(&item->entry); |
| } |
| |
| void expiring_item_del(struct expiring_item *item) |
| { |
| OSMO_ASSERT(item); |
| llist_del(&item->entry); |
| INIT_LLIST_HEAD(&item->entry); |
| if (item->del_cb) { |
| /* avoid loops */ |
| del_cb_t del_cb = item->del_cb; |
| item->del_cb = 0; |
| (del_cb)(item); |
| } |
| } |
| |
| |
| /* nr_map, nr_pool */ |
| |
| void nr_pool_init(struct nr_pool *pool, nr_t nr_min, nr_t nr_max) |
| { |
| *pool = (struct nr_pool){ |
| .nr_min = nr_min, |
| .nr_max = nr_max, |
| .last_nr = nr_max |
| }; |
| } |
| |
| nr_t nr_pool_next(struct nr_pool *pool) |
| { |
| if (pool->last_nr >= pool->nr_max) |
| pool->last_nr = pool->nr_min; |
| else |
| pool->last_nr ++; |
| |
| return pool->last_nr; |
| } |
| |
| void nr_map_init(struct nr_map *map, struct nr_pool *pool, |
| struct expiry *exq) |
| { |
| ZERO_STRUCT(map); |
| map->pool = pool; |
| map->add_items_to_expiry = exq; |
| INIT_LLIST_HEAD(&map->mappings); |
| } |
| |
| void nr_mapping_init(struct nr_mapping *m) |
| { |
| ZERO_STRUCT(m); |
| INIT_LLIST_HEAD(&m->entry); |
| expiring_item_init(&m->expiry_entry); |
| } |
| |
| void nr_map_add(struct nr_map *map, struct nr_mapping *mapping, time_t now) |
| { |
| /* Generate a mapped number */ |
| mapping->repl = nr_pool_next(map->pool); |
| |
| /* Add to the tail to always yield a list sorted by expiry, in |
| * ascending order. */ |
| llist_add_tail(&mapping->entry, &map->mappings); |
| nr_map_refresh(map, mapping, now); |
| } |
| |
| void nr_map_refresh(struct nr_map *map, struct nr_mapping *mapping, time_t now) |
| { |
| if (!map->add_items_to_expiry) |
| return; |
| expiry_add(map->add_items_to_expiry, |
| &mapping->expiry_entry, |
| now); |
| } |
| |
| void nr_map_clear(struct nr_map *map) |
| { |
| struct nr_mapping *m; |
| struct nr_mapping *n; |
| llist_for_each_entry_safe(m, n, &map->mappings, entry) { |
| nr_mapping_del(m); |
| } |
| } |
| |
| int nr_map_empty(const struct nr_map *map) |
| { |
| return llist_empty(&map->mappings); |
| } |
| |
| struct nr_mapping *nr_map_get(const struct nr_map *map, |
| void *origin, nr_t nr_orig) |
| { |
| struct nr_mapping *mapping; |
| llist_for_each_entry(mapping, &map->mappings, entry) { |
| if ((mapping->origin == origin) |
| && (mapping->orig == nr_orig)) |
| return mapping; |
| } |
| /* Not found. */ |
| return NULL; |
| } |
| |
| struct nr_mapping *nr_map_get_inv(const struct nr_map *map, nr_t nr_repl) |
| { |
| struct nr_mapping *mapping; |
| llist_for_each_entry(mapping, &map->mappings, entry) { |
| if (mapping->repl == nr_repl) { |
| return mapping; |
| } |
| } |
| /* Not found. */ |
| return NULL; |
| } |
| |
| void nr_mapping_del(struct nr_mapping *mapping) |
| { |
| OSMO_ASSERT(mapping); |
| llist_del(&mapping->entry); |
| INIT_LLIST_HEAD(&mapping->entry); |
| expiring_item_del(&mapping->expiry_entry); |
| } |
| |
| |
| /* gtphub */ |
| |
| const char* const gtphub_plane_idx_names[GTPH_PLANE_N] = { |
| "CTRL", |
| "USER", |
| }; |
| |
| const uint16_t gtphub_plane_idx_default_port[GTPH_PLANE_N] = { |
| 2123, |
| 2152, |
| }; |
| |
| const char* const gtphub_side_idx_names[GTPH_SIDE_N] = { |
| "SGSN", |
| "GGSN", |
| }; |
| |
| time_t gtphub_now(void) |
| { |
| struct timespec now_tp; |
| OSMO_ASSERT(clock_gettime(CLOCK_MONOTONIC, &now_tp) >= 0); |
| return now_tp.tv_sec; |
| } |
| |
| /* Remove a gtphub_peer from its list and free it. */ |
| static void gtphub_peer_del(struct gtphub_peer *peer) |
| { |
| OSMO_ASSERT(llist_empty(&peer->addresses)); |
| nr_map_clear(&peer->seq_map); |
| llist_del(&peer->entry); |
| talloc_free(peer); |
| } |
| |
| static void gtphub_peer_addr_del(struct gtphub_peer_addr *pa) |
| { |
| OSMO_ASSERT(llist_empty(&pa->ports)); |
| llist_del(&pa->entry); |
| talloc_free(pa); |
| } |
| |
| static void gtphub_peer_port_del(struct gtphub_peer_port *pp) |
| { |
| OSMO_ASSERT(pp->ref_count == 0); |
| llist_del(&pp->entry); |
| rate_ctr_group_free(pp->counters_io); |
| talloc_free(pp); |
| } |
| |
| /* From the information in the gtp_packet_desc, return the address of a GGSN. |
| * Return -1 on error. */ |
| static int gtphub_resolve_ggsn(struct gtphub *hub, |
| struct gtp_packet_desc *p, |
| struct gtphub_peer_port **pp); |
| |
| /* See gtphub_ext.c (wrapped by unit test) */ |
| struct gtphub_peer_port *gtphub_resolve_ggsn_addr(struct gtphub *hub, |
| const char *imsi_str, |
| const char *apn_ni_str); |
| int gtphub_ares_init(struct gtphub *hub); |
| |
| static void gtphub_zero(struct gtphub *hub) |
| { |
| ZERO_STRUCT(hub); |
| INIT_LLIST_HEAD(&hub->ggsn_lookups); |
| INIT_LLIST_HEAD(&hub->resolved_ggsns); |
| } |
| |
| static int gtphub_sock_init(struct osmo_fd *ofd, |
| const struct gtphub_cfg_addr *addr, |
| osmo_fd_cb_t cb, |
| void *data, |
| int ofd_id) |
| { |
| if (!addr->addr_str) { |
| LOG(LOGL_FATAL, "Cannot bind: empty address.\n"); |
| return -1; |
| } |
| if (!addr->port) { |
| LOG(LOGL_FATAL, "Cannot bind: zero port not permitted.\n"); |
| return -1; |
| } |
| |
| ofd->when = BSC_FD_READ; |
| ofd->cb = cb; |
| ofd->data = data; |
| ofd->priv_nr = ofd_id; |
| |
| int rc; |
| rc = osmo_sock_init_ofd(ofd, |
| AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, |
| addr->addr_str, addr->port, |
| OSMO_SOCK_F_BIND); |
| if (rc < 1) { |
| LOG(LOGL_FATAL, "Cannot bind to %s port %d (rc %d)\n", |
| addr->addr_str, (int)addr->port, rc); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static void gtphub_sock_close(struct osmo_fd *ofd) |
| { |
| close(ofd->fd); |
| osmo_fd_unregister(ofd); |
| ofd->cb = NULL; |
| } |
| |
| static void gtphub_bind_init(struct gtphub_bind *b) |
| { |
| ZERO_STRUCT(b); |
| |
| INIT_LLIST_HEAD(&b->peers); |
| |
| b->counters_io = rate_ctr_group_alloc(osmo_gtphub_ctx, |
| >phub_ctrg_io_desc, 0); |
| OSMO_ASSERT(b->counters_io); |
| } |
| |
| static int gtphub_bind_start(struct gtphub_bind *b, |
| const struct gtphub_cfg_bind *cfg, |
| osmo_fd_cb_t cb, void *cb_data, |
| unsigned int ofd_id) |
| { |
| LOG(LOGL_DEBUG, "Starting bind %s\n", b->label); |
| if (gsn_addr_from_str(&b->local_addr, cfg->bind.addr_str) != 0) { |
| LOG(LOGL_FATAL, "Invalid bind address for %s: %s\n", |
| b->label, cfg->bind.addr_str); |
| return -1; |
| } |
| if (gtphub_sock_init(&b->ofd, &cfg->bind, cb, cb_data, ofd_id) != 0) { |
| LOG(LOGL_FATAL, "Cannot bind for %s: %s\n", |
| b->label, cfg->bind.addr_str); |
| return -1; |
| } |
| b->local_port = cfg->bind.port; |
| return 0; |
| } |
| |
| static void gtphub_bind_free(struct gtphub_bind *b) |
| { |
| OSMO_ASSERT(llist_empty(&b->peers)); |
| rate_ctr_group_free(b->counters_io); |
| } |
| |
| static void gtphub_bind_stop(struct gtphub_bind *b) { |
| gtphub_sock_close(&b->ofd); |
| gtphub_bind_free(b); |
| } |
| |
| /* Recv datagram from from->fd, write sender's address to *from_addr. |
| * Return the number of bytes read, zero on error. */ |
| static int gtphub_read(const struct osmo_fd *from, |
| struct osmo_sockaddr *from_addr, |
| uint8_t *buf, size_t buf_len) |
| { |
| OSMO_ASSERT(from_addr); |
| |
| /* recvfrom requires the available length set in *from_addr_len. */ |
| from_addr->l = sizeof(from_addr->a); |
| errno = 0; |
| ssize_t received = recvfrom(from->fd, buf, buf_len, 0, |
| (struct sockaddr*)&from_addr->a, |
| &from_addr->l); |
| /* TODO use recvmsg and get a MSG_TRUNC flag to make sure the message |
| * is not truncated. Then maybe reduce buf's size. */ |
| |
| if (received <= 0) { |
| LOG((errno == EAGAIN? LOGL_DEBUG : LOGL_ERROR), |
| "error: %s\n", strerror(errno)); |
| return 0; |
| } |
| |
| LOG(LOGL_DEBUG, "Received %d bytes from %s: %s%s\n", |
| (int)received, osmo_sockaddr_to_str(from_addr), |
| osmo_hexdump(buf, received > 1000? 1000 : received), |
| received > 1000 ? "..." : ""); |
| |
| return received; |
| } |
| |
| static inline void gtphub_port_ref_count_inc(struct gtphub_peer_port *pp) |
| { |
| OSMO_ASSERT(pp); |
| OSMO_ASSERT(pp->ref_count < UINT_MAX); |
| pp->ref_count++; |
| } |
| |
| static inline void gtphub_port_ref_count_dec(struct gtphub_peer_port *pp) |
| { |
| OSMO_ASSERT(pp); |
| OSMO_ASSERT(pp->ref_count > 0); |
| pp->ref_count--; |
| } |
| |
| static inline void set_seq(struct gtp_packet_desc *p, uint16_t seq) |
| { |
| OSMO_ASSERT(p->version == 1); |
| p->data->gtp1l.h.seq = hton16(seq); |
| p->seq = seq; |
| } |
| |
| static inline void set_tei(struct gtp_packet_desc *p, uint32_t tei) |
| { |
| OSMO_ASSERT(p->version == 1); |
| p->data->gtp1l.h.tei = hton32(tei); |
| p->header_tei = tei; |
| } |
| |
| static void gtphub_mapping_del_cb(struct expiring_item *expi); |
| |
| static struct nr_mapping *gtphub_mapping_new() |
| { |
| struct nr_mapping *nrm; |
| nrm = talloc_zero(osmo_gtphub_ctx, struct nr_mapping); |
| OSMO_ASSERT(nrm); |
| |
| nr_mapping_init(nrm); |
| nrm->expiry_entry.del_cb = gtphub_mapping_del_cb; |
| return nrm; |
| } |
| |
| |
| #define APPEND(args...) \ |
| l = snprintf(pos, left, args); \ |
| pos += l; \ |
| left -= l |
| |
| static const char *gtphub_tunnel_side_str(struct gtphub_tunnel *tun, |
| int side_idx) |
| { |
| static char buf[256]; |
| char *pos = buf; |
| int left = sizeof(buf); |
| int l; |
| |
| struct gtphub_tunnel_endpoint *c, *u; |
| c = &tun->endpoint[side_idx][GTPH_PLANE_CTRL]; |
| u = &tun->endpoint[side_idx][GTPH_PLANE_USER]; |
| |
| /* print both only if they differ. */ |
| if (!c->peer) { |
| APPEND("(uninitialized)"); |
| } else { |
| APPEND("%s", gsn_addr_to_str(&c->peer->peer_addr->addr)); |
| } |
| |
| if (!u->peer) { |
| if (c->peer) { |
| APPEND("/(uninitialized)"); |
| } |
| } else if ((!c->peer) |
| || (!gsn_addr_same(&u->peer->peer_addr->addr, |
| &c->peer->peer_addr->addr))) { |
| APPEND("/%s", gsn_addr_to_str(&u->peer->peer_addr->addr)); |
| } |
| |
| APPEND(" (TEI C=%x U=%x)", |
| c->tei_orig, |
| u->tei_orig); |
| return buf; |
| } |
| |
| const char *gtphub_tunnel_str(struct gtphub_tunnel *tun) |
| { |
| static char buf[512]; |
| char *pos = buf; |
| int left = sizeof(buf); |
| int l; |
| |
| APPEND("TEI=%x: ", tun->tei_repl); |
| APPEND("%s", gtphub_tunnel_side_str(tun, GTPH_SIDE_SGSN)); |
| APPEND(" <-> %s", gtphub_tunnel_side_str(tun, GTPH_SIDE_GGSN)); |
| |
| return buf; |
| } |
| |
| #undef APPEND |
| |
| void gtphub_tunnel_endpoint_set_peer(struct gtphub_tunnel_endpoint *te, |
| struct gtphub_peer_port *pp) |
| { |
| if (te->peer) |
| gtphub_port_ref_count_dec(te->peer); |
| te->peer = pp; |
| if (te->peer) |
| gtphub_port_ref_count_inc(te->peer); |
| } |
| |
| int gtphub_tunnel_complete(struct gtphub_tunnel *tun) |
| { |
| if (!tun) |
| return 0; |
| if (!tun->tei_repl) |
| return 0; |
| int side_idx; |
| int plane_idx; |
| for_each_side_and_plane(side_idx, plane_idx) { |
| struct gtphub_tunnel_endpoint *te = |
| &tun->endpoint[side_idx][plane_idx]; |
| if (!(te->peer && te->tei_orig)) |
| return 0; |
| } |
| return 1; |
| } |
| |
| static void gtphub_tunnel_del_cb(struct expiring_item *expi) |
| { |
| struct gtphub_tunnel *tun = container_of(expi, |
| struct gtphub_tunnel, |
| expiry_entry); |
| LOG(LOGL_DEBUG, "expired: %s\n", gtphub_tunnel_str(tun)); |
| |
| llist_del(&tun->entry); |
| INIT_LLIST_HEAD(&tun->entry); /* mark unused */ |
| |
| expi->del_cb = 0; /* avoid recursion loops */ |
| expiring_item_del(&tun->expiry_entry); /* usually already done, but make sure. */ |
| |
| int side_idx; |
| int plane_idx; |
| for_each_side_and_plane(side_idx, plane_idx) { |
| struct gtphub_tunnel_endpoint *te = &tun->endpoint[side_idx][plane_idx]; |
| |
| /* clear ref count */ |
| gtphub_tunnel_endpoint_set_peer(te, NULL); |
| |
| rate_ctr_group_free(te->counters_io); |
| } |
| |
| talloc_free(tun); |
| } |
| |
| static struct gtphub_tunnel *gtphub_tunnel_new() |
| { |
| struct gtphub_tunnel *tun; |
| tun = talloc_zero(osmo_gtphub_ctx, struct gtphub_tunnel); |
| OSMO_ASSERT(tun); |
| |
| INIT_LLIST_HEAD(&tun->entry); |
| expiring_item_init(&tun->expiry_entry); |
| |
| int side_idx, plane_idx; |
| for_each_side_and_plane(side_idx, plane_idx) { |
| struct gtphub_tunnel_endpoint *te = &tun->endpoint[side_idx][plane_idx]; |
| te->counters_io = rate_ctr_group_alloc(osmo_gtphub_ctx, |
| >phub_ctrg_io_desc, |
| 0); |
| OSMO_ASSERT(te->counters_io); |
| } |
| |
| tun->expiry_entry.del_cb = gtphub_tunnel_del_cb; |
| return tun; |
| } |
| |
| static const char *gtphub_peer_strb(struct gtphub_peer *peer, char *buf, |
| int buflen) |
| { |
| if (llist_empty(&peer->addresses)) |
| return "(addressless)"; |
| |
| struct gtphub_peer_addr *a = llist_first(&peer->addresses, |
| struct gtphub_peer_addr, |
| entry); |
| return gsn_addr_to_strb(&a->addr, buf, buflen); |
| } |
| |
| static const char *gtphub_port_strb(struct gtphub_peer_port *port, char *buf, |
| int buflen) |
| { |
| if (!port) |
| return "(null port)"; |
| |
| snprintf(buf, buflen, "%s port %d", |
| gsn_addr_to_str(&port->peer_addr->addr), |
| (int)port->port); |
| return buf; |
| } |
| |
| const char *gtphub_peer_str(struct gtphub_peer *peer) |
| { |
| static char buf[256]; |
| return gtphub_peer_strb(peer, buf, sizeof(buf)); |
| } |
| |
| const char *gtphub_port_str(struct gtphub_peer_port *port) |
| { |
| static char buf[256]; |
| return gtphub_port_strb(port, buf, sizeof(buf)); |
| } |
| |
| static const char *gtphub_port_str2(struct gtphub_peer_port *port) |
| { |
| static char buf[256]; |
| return gtphub_port_strb(port, buf, sizeof(buf)); |
| } |
| |
| static void gtphub_mapping_del_cb(struct expiring_item *expi) |
| { |
| expi->del_cb = 0; /* avoid recursion loops */ |
| expiring_item_del(expi); /* usually already done, but make sure. */ |
| |
| struct nr_mapping *nrm = container_of(expi, |
| struct nr_mapping, |
| expiry_entry); |
| llist_del(&nrm->entry); |
| INIT_LLIST_HEAD(&nrm->entry); /* mark unused */ |
| |
| /* Just for log */ |
| struct gtphub_peer_port *from = nrm->origin; |
| OSMO_ASSERT(from); |
| LOG(LOGL_DEBUG, "expired: %d: nr mapping from %s: %u->%u\n", |
| (int)nrm->expiry_entry.expiry, |
| gtphub_port_str(from), |
| (unsigned int)nrm->orig, (unsigned int)nrm->repl); |
| |
| gtphub_port_ref_count_dec(from); |
| |
| talloc_free(nrm); |
| } |
| |
| static struct nr_mapping *gtphub_mapping_have(struct nr_map *map, |
| struct gtphub_peer_port *from, |
| nr_t orig_nr, |
| time_t now) |
| { |
| struct nr_mapping *nrm; |
| |
| nrm = nr_map_get(map, from, orig_nr); |
| |
| if (!nrm) { |
| nrm = gtphub_mapping_new(); |
| nrm->orig = orig_nr; |
| nrm->origin = from; |
| nr_map_add(map, nrm, now); |
| gtphub_port_ref_count_inc(from); |
| LOG(LOGL_DEBUG, "peer %s: sequence map %d --> %d\n", |
| gtphub_port_str(from), |
| (int)(nrm->orig), (int)(nrm->repl)); |
| } else { |
| nr_map_refresh(map, nrm, now); |
| } |
| |
| OSMO_ASSERT(nrm); |
| return nrm; |
| } |
| |
| static void gtphub_map_seq(struct gtp_packet_desc *p, |
| struct gtphub_peer_port *from_port, |
| struct gtphub_peer_port *to_port) |
| { |
| /* Store a mapping in to_peer's map, so when we later receive a GTP |
| * packet back from to_peer, the seq nr can be unmapped back to its |
| * origin (from_peer here). */ |
| struct nr_mapping *nrm; |
| nrm = gtphub_mapping_have(&to_port->peer_addr->peer->seq_map, |
| from_port, p->seq, p->timestamp); |
| |
| /* Change the GTP packet to yield the new, mapped seq nr */ |
| set_seq(p, nrm->repl); |
| } |
| |
| static struct gtphub_peer_port *gtphub_unmap_seq(struct gtp_packet_desc *p, |
| struct gtphub_peer_port *responding_port) |
| { |
| OSMO_ASSERT(p->version == 1); |
| struct nr_mapping *nrm = |
| nr_map_get_inv(&responding_port->peer_addr->peer->seq_map, |
| p->seq); |
| if (!nrm) |
| return NULL; |
| LOG(LOGL_DEBUG, "peer %p: sequence unmap %d <-- %d\n", |
| nrm->origin, (int)(nrm->orig), (int)(nrm->repl)); |
| set_seq(p, nrm->orig); |
| return nrm->origin; |
| } |
| |
| static int gtphub_check_mapped_tei(struct gtphub_tunnel *new_tun, |
| struct gtphub_tunnel *iterated_tun, |
| uint32_t *tei_min, |
| uint32_t *tei_max) |
| { |
| if (!new_tun->tei_repl || !iterated_tun->tei_repl) |
| return 1; |
| |
| *tei_min = (*tei_min < iterated_tun->tei_repl)? *tei_min : iterated_tun->tei_repl; |
| *tei_max = (*tei_max > iterated_tun->tei_repl)? *tei_max : iterated_tun->tei_repl; |
| |
| if (new_tun->tei_repl != iterated_tun->tei_repl) |
| return 1; |
| |
| /* new_tun->tei_repl is already taken. Try to find one out of the known |
| * range. */ |
| LOG(LOGL_DEBUG, "TEI replacement %d already taken.\n", new_tun->tei_repl); |
| |
| if ((*tei_max) < 0xffffffff) { |
| (*tei_max)++; |
| new_tun->tei_repl = *tei_max; |
| LOG(LOGL_DEBUG, "Using TEI %d instead.\n", new_tun->tei_repl); |
| return 1; |
| } else if ((*tei_min) > 1) { |
| (*tei_min)--; |
| new_tun->tei_repl = *tei_min; |
| LOG(LOGL_DEBUG, "Using TEI %d instead.\n", new_tun->tei_repl); |
| return 1; |
| } |
| |
| /* None seems to be available. */ |
| return 0; |
| } |
| |
| static int gtphub_check_reused_teis(struct gtphub *hub, |
| struct gtphub_tunnel *new_tun) |
| { |
| uint32_t tei_min = 0xffffffff; |
| uint32_t tei_max = 0; |
| int side_idx; |
| int plane_idx; |
| struct gtphub_tunnel_endpoint *te; |
| struct gtphub_tunnel_endpoint *te2; |
| |
| struct gtphub_tunnel *tun, *ntun; |
| |
| llist_for_each_entry_safe(tun, ntun, &hub->tunnels, entry) { |
| if (tun == new_tun) |
| continue; |
| |
| /* Check whether the GSN sent a TEI that it is reusing from a |
| * previous tunnel. */ |
| int tun_continue = 0; |
| for_each_side(side_idx) { |
| for_each_plane(plane_idx) { |
| te = &tun->endpoint[side_idx][plane_idx]; |
| te2 = &new_tun->endpoint[side_idx][plane_idx]; |
| if ((te->tei_orig == 0) |
| || (te->tei_orig != te2->tei_orig) |
| || (!te->peer) |
| || (!te2->peer) |
| || !gsn_addr_same(&te->peer->peer_addr->addr, |
| &te2->peer->peer_addr->addr)) |
| continue; |
| |
| /* The peer is reusing a TEI that I believe to |
| * be part of another tunnel. The other tunnel |
| * must be stale, then. */ |
| LOG(LOGL_NOTICE, |
| "Expiring tunnel due to reused TEI:" |
| " %s peer %s sent %s TEI %x," |
| " previously used by tunnel %s...\n", |
| gtphub_side_idx_names[side_idx], |
| gtphub_port_str(te->peer), |
| gtphub_plane_idx_names[plane_idx], |
| te->tei_orig, |
| gtphub_tunnel_str(tun)); |
| LOG(LOGL_NOTICE, "...while establishing tunnel %s\n", |
| gtphub_tunnel_str(new_tun)); |
| |
| expiring_item_del(&tun->expiry_entry); |
| /* continue to find more matches. There shouldn't be |
| * any, but let's make sure. However, tun is deleted, |
| * so we need to skip to the next tunnel. */ |
| tun_continue = 1; |
| break; |
| } |
| if (tun_continue) |
| break; |
| } |
| if (tun_continue) |
| continue; |
| |
| /* Check whether the mapped TEI is already used by another |
| * tunnel. */ |
| if (!gtphub_check_mapped_tei(new_tun, tun, &tei_min, &tei_max)) { |
| LOG(LOGL_ERROR, |
| "No mapped TEI is readily available." |
| " Searching for holes between occupied" |
| " TEIs not implemented."); |
| return 0; |
| } |
| |
| } |
| |
| return 1; |
| } |
| |
| static void gtphub_tunnel_refresh(struct gtphub *hub, |
| struct gtphub_tunnel *tun, |
| time_t now) |
| { |
| expiry_add(&hub->expire_slowly, |
| &tun->expiry_entry, |
| now); |
| } |
| |
| static struct gtphub_tunnel_endpoint *gtphub_unmap_tei(struct gtphub *hub, |
| struct gtp_packet_desc *p, |
| struct gtphub_peer_port *from, |
| struct gtphub_tunnel **unmapped_from_tun) |
| { |
| OSMO_ASSERT(from); |
| int other_side = other_side_idx(p->side_idx); |
| |
| struct gtphub_tunnel *tun; |
| llist_for_each_entry(tun, &hub->tunnels, entry) { |
| struct gtphub_tunnel_endpoint *te_from = |
| &tun->endpoint[p->side_idx][p->plane_idx]; |
| struct gtphub_tunnel_endpoint *te_to = |
| &tun->endpoint[other_side][p->plane_idx]; |
| if ((tun->tei_repl == p->header_tei_rx) |
| && te_from->peer |
| && gsn_addr_same(&te_from->peer->peer_addr->addr, |
| &from->peer_addr->addr)) { |
| gtphub_tunnel_refresh(hub, tun, p->timestamp); |
| if (unmapped_from_tun) |
| *unmapped_from_tun = tun; |
| return te_to; |
| } |
| } |
| |
| if (unmapped_from_tun) |
| *unmapped_from_tun = NULL; |
| return NULL; |
| } |
| |
| static void gtphub_map_restart_counter(struct gtphub *hub, |
| struct gtp_packet_desc *p) |
| { |
| if (p->rc != GTP_RC_PDU_C) |
| return; |
| |
| int ie_idx; |
| ie_idx = gtpie_getie(p->ie, GTPIE_RECOVERY, 0); |
| if (ie_idx < 0) |
| return; |
| |
| /* Always send gtphub's own restart counter */ |
| p->ie[ie_idx]->tv1.v = hton8(hub->restart_counter); |
| } |
| |
| static int gtphub_unmap_header_tei(struct gtphub_peer_port **to_port_p, |
| struct gtphub_tunnel **unmapped_from_tun, |
| struct gtphub *hub, |
| struct gtp_packet_desc *p, |
| struct gtphub_peer_port *from_port) |
| { |
| OSMO_ASSERT(p->version == 1); |
| *to_port_p = NULL; |
| if (unmapped_from_tun) |
| *unmapped_from_tun = NULL; |
| |
| /* If the header's TEI is zero, no PDP context has been established |
| * yet. If nonzero, a mapping should actually already exist for this |
| * TEI, since it must have been announced in a PDP context creation. */ |
| if (!p->header_tei_rx) |
| return 0; |
| |
| /* to_peer has previously announced a TEI, which was stored and |
| * mapped in a tunnel struct. */ |
| struct gtphub_tunnel_endpoint *to; |
| to = gtphub_unmap_tei(hub, p, from_port, unmapped_from_tun); |
| if (!to) { |
| LOG(LOGL_ERROR, "Received unknown TEI %" PRIx32 " from %s\n", |
| p->header_tei_rx, gtphub_port_str(from_port)); |
| return -1; |
| } |
| |
| if (unmapped_from_tun) { |
| OSMO_ASSERT(*unmapped_from_tun); |
| LOG(LOGL_DEBUG, "Unmapped TEI coming from: %s\n", |
| gtphub_tunnel_str(*unmapped_from_tun)); |
| } |
| |
| uint32_t unmapped_tei = to->tei_orig; |
| set_tei(p, unmapped_tei); |
| |
| /* May be NULL for an invalidated tunnel. */ |
| *to_port_p = to->peer; |
| |
| return 0; |
| } |
| |
| static int gtphub_handle_create_pdp_ctx(struct gtphub *hub, |
| struct gtp_packet_desc *p, |
| struct gtphub_peer_port *from_ctrl, |
| struct gtphub_peer_port *to_ctrl) |
| { |
| int plane_idx; |
| |
| osmo_static_assert((GTPH_PLANE_CTRL == 0) && (GTPH_PLANE_USER == 1), |
| plane_nrs_match_GSN_addr_IE_indices); |
| |
| struct gtphub_tunnel *tun = p->tun; |
| |
| if (p->type == GTP_CREATE_PDP_REQ) { |
| if (p->side_idx != GTPH_SIDE_SGSN) { |
| LOG(LOGL_ERROR, "Wrong side: Create PDP Context" |
| " Request from the GGSN side: %s", |
| gtphub_port_str(from_ctrl)); |
| return -1; |
| } |
| |
| if (tun) { |
| LOG(LOGL_ERROR, "Not implemented: Received" |
| " Create PDP Context Request for an already" |
| " established tunnel:" |
| " from %s, tunnel %s\n", |
| gtphub_port_str(from_ctrl), |
| gtphub_tunnel_str(p->tun)); |
| return -1; |
| } |
| |
| /* A new tunnel. */ |
| p->tun = tun = gtphub_tunnel_new(); |
| |
| /* Create TEI mapping */ |
| tun->tei_repl = nr_pool_next(&hub->tei_pool); |
| |
| llist_add(&tun->entry, &hub->tunnels); |
| gtphub_tunnel_refresh(hub, tun, p->timestamp); |
| /* The endpoint peers on this side (SGSN) will be set from IEs |
| * below. Also set the GGSN Ctrl endpoint, for logging. */ |
| gtphub_tunnel_endpoint_set_peer(&tun->endpoint[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL], |
| to_ctrl); |
| } else if (p->type == GTP_CREATE_PDP_RSP) { |
| if (p->side_idx != GTPH_SIDE_GGSN) { |
| LOG(LOGL_ERROR, "Wrong side: Create PDP Context" |
| " Response from the SGSN side: %s", |
| gtphub_port_str(from_ctrl)); |
| return -1; |
| } |
| |
| /* The tunnel should already have been resolved from the header |
| * TEI and be available in tun (== p->tun). Just fill in the |
| * GSN Addresses below.*/ |
| OSMO_ASSERT(tun); |
| OSMO_ASSERT(tun->tei_repl == p->header_tei_rx); |
| OSMO_ASSERT(to_ctrl); |
| } |
| |
| uint8_t ie_type[] = { GTPIE_TEI_C, GTPIE_TEI_DI }; |
| int ie_mandatory = (p->type == GTP_CREATE_PDP_REQ); |
| unsigned int side_idx = p->side_idx; |
| |
| for (plane_idx = 0; plane_idx < 2; plane_idx++) { |
| int rc; |
| struct gsn_addr use_addr; |
| uint16_t use_port; |
| uint32_t tei_from_ie; |
| int ie_idx; |
| |
| /* Fetch GSN Address and TEI from IEs. As ensured by above |
| * static asserts, plane_idx corresponds to the GSN Address IE |
| * index (the first one = 0 = ctrl, second one = 1 = user). */ |
| rc = gsn_addr_get(&use_addr, p, plane_idx); |
| if (rc) { |
| LOG(LOGL_ERROR, "Cannot read %s GSN Address IE\n", |
| gtphub_plane_idx_names[plane_idx]); |
| return -1; |
| } |
| LOG(LOGL_DEBUG, "Read %s GSN addr %s (%d)\n", |
| gtphub_plane_idx_names[plane_idx], |
| gsn_addr_to_str(&use_addr), |
| use_addr.len); |
| |
| ie_idx = gtpie_getie(p->ie, ie_type[plane_idx], 0); |
| if (ie_idx < 0) { |
| if (ie_mandatory) { |
| LOG(LOGL_ERROR, |
| "Create PDP Context message invalid:" |
| " missing IE %d\n", |
| (int)ie_type[plane_idx]); |
| return -1; |
| } |
| tei_from_ie = 0; |
| } |
| else |
| tei_from_ie = ntoh32(p->ie[ie_idx]->tv4.v); |
| |
| /* Make sure an entry for this peer address with default port |
| * exists. |
| * |
| * Exception: if sgsn_use_sender is set, instead use the |
| * sender's address and port for Ctrl -- the User port is not |
| * known until the first User packet arrives. |
| * |
| * Note: doing this here is just an optimization, because |
| * gtphub_handle_buf() has code to replace the tunnel |
| * endpoints' addresses with the sender (needed for User |
| * plane). We could just ignore sgsn_use_sender here. But if we |
| * set up a default port here and replace it in |
| * gtphub_handle_buf(), we'd be creating a peer port just to |
| * expire it right away. */ |
| if (hub->sgsn_use_sender && (side_idx == GTPH_SIDE_SGSN)) { |
| gsn_addr_from_sockaddr(&use_addr, &use_port, &from_ctrl->sa); |
| } else { |
| use_port = gtphub_plane_idx_default_port[plane_idx]; |
| |
| } |
| |
| struct gtphub_peer_port *peer_from_ie; |
| peer_from_ie = gtphub_port_have(hub, |
| &hub->to_gsns[side_idx][plane_idx], |
| &use_addr, use_port); |
| |
| gtphub_tunnel_endpoint_set_peer(&tun->endpoint[side_idx][plane_idx], |
| peer_from_ie); |
| |
| if (!tei_from_ie && |
| !tun->endpoint[side_idx][plane_idx].tei_orig) { |
| LOG(LOGL_ERROR, |
| "Create PDP Context message omits %s TEI, but" |
| " no TEI has been announced for this tunnel: %s\n", |
| gtphub_plane_idx_names[plane_idx], |
| gtphub_tunnel_str(tun)); |
| return -1; |
| } |
| |
| if (tei_from_ie) { |
| /* Replace TEI in GTP packet IE */ |
| tun->endpoint[side_idx][plane_idx].tei_orig = tei_from_ie; |
| p->ie[ie_idx]->tv4.v = hton32(tun->tei_repl); |
| |
| if (!gtphub_check_reused_teis(hub, tun)) { |
| /* It's highly unlikely that all TEIs are |
| * taken. But the code looking for an unused |
| * TEI is, at the time of writing this comment, |
| * not able to find gaps in the TEI space. To |
| * explicitly alert the user of this problem, |
| * rather abort than carry on. */ |
| LOG(LOGL_FATAL, "TEI range exhausted. Cannot create TEI mapping, aborting.\n"); |
| abort(); |
| } |
| } |
| |
| /* Replace the GSN address to reflect gtphub. */ |
| rc = gsn_addr_put(&hub->to_gsns[other_side_idx(side_idx)][plane_idx].local_addr, |
| p, plane_idx); |
| if (rc) { |
| LOG(LOGL_ERROR, "Cannot write %s GSN Address IE\n", |
| gtphub_plane_idx_names[plane_idx]); |
| return -1; |
| } |
| } |
| |
| if (p->type == GTP_CREATE_PDP_REQ) { |
| LOG(LOGL_DEBUG, "New tunnel, first half: %s\n", |
| gtphub_tunnel_str(tun)); |
| } else if (p->type == GTP_CREATE_PDP_RSP) { |
| LOG(LOGL_DEBUG, "New tunnel: %s\n", |
| gtphub_tunnel_str(tun)); |
| } |
| |
| return 0; |
| } |
| |
| static void pending_delete_del_cb(struct expiring_item *expi) |
| { |
| struct pending_delete *pd; |
| pd = container_of(expi, struct pending_delete, expiry_entry); |
| |
| llist_del(&pd->entry); |
| INIT_LLIST_HEAD(&pd->entry); |
| |
| pd->expiry_entry.del_cb = 0; |
| expiring_item_del(&pd->expiry_entry); |
| |
| talloc_free(pd); |
| } |
| |
| static struct pending_delete *pending_delete_new(void) |
| { |
| struct pending_delete *pd = talloc_zero(osmo_gtphub_ctx, struct pending_delete); |
| INIT_LLIST_HEAD(&pd->entry); |
| expiring_item_init(&pd->expiry_entry); |
| pd->expiry_entry.del_cb = pending_delete_del_cb; |
| return pd; |
| } |
| |
| static int gtphub_handle_delete_pdp_ctx(struct gtphub *hub, |
| struct gtp_packet_desc *p, |
| struct gtphub_peer_port *from_ctrl, |
| struct gtphub_peer_port *to_ctrl) |
| { |
| struct gtphub_tunnel *known_tun = p->tun; |
| |
| if (p->type == GTP_DELETE_PDP_REQ) { |
| if (!known_tun) { |
| LOG(LOGL_ERROR, "Cannot find tunnel for Delete PDP Context Request.\n"); |
| return -1; |
| } |
| |
| /* Store the Delete Request until a successful Response is seen. */ |
| uint8_t teardown_ind; |
| uint8_t nsapi; |
| |
| if (gtpie_gettv1(p->ie, GTPIE_TEARDOWN, 0, &teardown_ind) != 0) { |
| LOG(LOGL_ERROR, "Missing Teardown Ind IE in Delete PDP Context Request.\n"); |
| return -1; |
| } |
| |
| if (gtpie_gettv1(p->ie, GTPIE_NSAPI, 0, &nsapi) != 0) { |
| LOG(LOGL_ERROR, "Missing NSAPI IE in Delete PDP Context Request.\n"); |
| return -1; |
| } |
| |
| struct pending_delete *pd = NULL; |
| |
| struct pending_delete *pdi = NULL; |
| llist_for_each_entry(pdi, &hub->pending_deletes, entry) { |
| if ((pdi->tun == known_tun) |
| && (pdi->teardown_ind == teardown_ind) |
| && (pdi->nsapi == nsapi)) { |
| pd = pdi; |
| break; |
| } |
| } |
| |
| if (!pd) { |
| pd = pending_delete_new(); |
| pd->tun = known_tun; |
| pd->teardown_ind = teardown_ind; |
| pd->nsapi = nsapi; |
| |
| LOG(LOGL_DEBUG, "Tunnel delete pending: %s\n", |
| gtphub_tunnel_str(known_tun)); |
| llist_add(&pd->entry, &hub->pending_deletes); |
| } |
| |
| /* Add or refresh timeout. */ |
| expiry_add(&hub->expire_quickly, &pd->expiry_entry, p->timestamp); |
| |
| /* If a pending_delete should expire before the response to |
| * indicate success comes in, the responding peer will have the |
| * tunnel deactivated, while the requesting peer gets no reply |
| * and keeps the tunnel. The hope is that the requesting peer |
| * will try again and get a useful response. */ |
| } else if (p->type == GTP_DELETE_PDP_RSP) { |
| /* Find the Delete Request for this Response. */ |
| struct pending_delete *pd = NULL; |
| |
| struct pending_delete *pdi; |
| llist_for_each_entry(pdi, &hub->pending_deletes, entry) { |
| if (known_tun == pdi->tun) { |
| pd = pdi; |
| break; |
| } |
| } |
| |
| if (!pd) { |
| LOG(LOGL_ERROR, "Delete PDP Context Response:" |
| " Cannot find matching request."); |
| /* If we delete the tunnel now, anyone can send a |
| * Delete response to kill tunnels at will. */ |
| return -1; |
| } |
| |
| /* TODO handle teardown_ind and nsapi */ |
| |
| expiring_item_del(&pd->expiry_entry); |
| |
| uint8_t cause; |
| if (gtpie_gettv1(p->ie, GTPIE_CAUSE, 0, &cause) != 0) { |
| LOG(LOGL_ERROR, "Delete PDP Context Response:" |
| " Missing Cause IE."); |
| /* If we delete the tunnel now, at least one of the |
| * peers may still think it is active. */ |
| return -1; |
| } |
| |
| if (cause != GTPCAUSE_ACC_REQ) { |
| LOG(LOGL_NOTICE, |
| "Delete PDP Context Response indicates failure;" |
| "for %s\n", |
| gtphub_tunnel_str(known_tun)); |
| return -1; |
| } |
| |
| LOG(LOGL_DEBUG, "Delete PDP Context: removing tunnel %s\n", |
| gtphub_tunnel_str(known_tun)); |
| p->tun = NULL; |
| expiring_item_del(&known_tun->expiry_entry); |
| } |
| |
| return 0; |
| } |
| |
| static int gtphub_handle_update_pdp_ctx(struct gtphub *hub, |
| struct gtp_packet_desc *p, |
| struct gtphub_peer_port *from_ctrl, |
| struct gtphub_peer_port *to_ctrl) |
| { |
| /* TODO */ |
| return 0; |
| } |
| |
| /* Read GSN address IEs from p, and make sure these peer addresses exist in |
| * bind[plane_idx] with default ports, in their respective planes (both Ctrl |
| * and User). Map TEIs announced in IEs, and write mapped TEIs in-place into |
| * the packet p. */ |
| static int gtphub_handle_pdp_ctx(struct gtphub *hub, |
| struct gtp_packet_desc *p, |
| struct gtphub_peer_port *from_ctrl, |
| struct gtphub_peer_port *to_ctrl) |
| { |
| OSMO_ASSERT(p->plane_idx == GTPH_PLANE_CTRL); |
| |
| switch (p->type) { |
| case GTP_CREATE_PDP_REQ: |
| case GTP_CREATE_PDP_RSP: |
| return gtphub_handle_create_pdp_ctx(hub, p, |
| from_ctrl, to_ctrl); |
| |
| case GTP_DELETE_PDP_REQ: |
| case GTP_DELETE_PDP_RSP: |
| return gtphub_handle_delete_pdp_ctx(hub, p, |
| from_ctrl, to_ctrl); |
| |
| case GTP_UPDATE_PDP_REQ: |
| case GTP_UPDATE_PDP_RSP: |
| return gtphub_handle_update_pdp_ctx(hub, p, |
| from_ctrl, to_ctrl); |
| |
| default: |
| /* Nothing to do for this message type. */ |
| return 0; |
| } |
| |
| } |
| |
| static int gtphub_send_del_pdp_ctx(struct gtphub *hub, |
| struct gtphub_tunnel *tun, |
| int to_side) |
| { |
| static uint8_t del_ctx_msg[16] = { |
| 0x32, /* GTP v1 flags */ |
| GTP_DELETE_PDP_REQ, |
| 0x00, 0x08, /* Length in network byte order */ |
| 0x00, 0x00, 0x00, 0x00, /* TEI to be replaced */ |
| 0, 0, /* Seq, to be replaced */ |
| 0, 0, /* no extensions */ |
| 0x13, 0xff, /* 19: Teardown ind = 1 */ |
| 0x14, 0 /* 20: NSAPI = 0 */ |
| }; |
| |
| uint32_t *tei = (uint32_t*)&del_ctx_msg[4]; |
| uint16_t *seq = (uint16_t*)&del_ctx_msg[8]; |
| |
| struct gtphub_tunnel_endpoint *te = |
| &tun->endpoint[to_side][GTPH_PLANE_CTRL]; |
| |
| if (! te->peer) |
| return 0; |
| |
| *tei = hton32(te->tei_orig); |
| *seq = hton16(nr_pool_next(&te->peer->peer_addr->peer->seq_pool)); |
| |
| struct gtphub_bind *to_bind = &hub->to_gsns[to_side][GTPH_PLANE_CTRL]; |
| int rc = gtphub_write(&to_bind->ofd, &te->peer->sa, |
| del_ctx_msg, sizeof(del_ctx_msg)); |
| if (rc != 0) { |
| LOG(LOGL_ERROR, |
| "Failed to send out-of-band Delete PDP Context Request to %s\n", |
| gtphub_port_str(te->peer)); |
| } |
| return rc; |
| } |
| |
| /* Tell all peers on the other end of tunnels that PDP contexts are void. */ |
| static void gtphub_restarted(struct gtphub *hub, |
| struct gtp_packet_desc *p, |
| struct gtphub_peer_port *pp) |
| { |
| LOG(LOGL_NOTICE, "Peer has restarted: %s\n", |
| gtphub_port_str(pp)); |
| |
| int deleted_count = 0; |
| struct gtphub_tunnel *tun; |
| llist_for_each_entry(tun, &hub->tunnels, entry) { |
| int side_idx; |
| for_each_side(side_idx) { |
| struct gtphub_tunnel_endpoint *te = &tun->endpoint[side_idx][GTPH_PLANE_CTRL]; |
| struct gtphub_tunnel_endpoint *te2 = &tun->endpoint[other_side_idx(side_idx)][GTPH_PLANE_CTRL]; |
| if ((!te->peer) |
| || (!te2->tei_orig) |
| || (pp->peer_addr->peer != te->peer->peer_addr->peer)) |
| continue; |
| |
| LOG(LOGL_DEBUG, "Deleting tunnel due to peer restart: %s\n", |
| gtphub_tunnel_str(tun)); |
| deleted_count ++; |
| |
| /* Send a Delete PDP Context Request to the |
| * peer on the other side, remember the pending |
| * delete and wait for the response to delete |
| * the tunnel. Clear this side of the tunnel to |
| * make sure it isn't used. |
| * |
| * Should the delete message send fail, or if no |
| * response is received, this tunnel will expire. If |
| * its TEIs come up in a new PDP Context Request, it |
| * will be removed. If messages for this tunnel should |
| * come in (from the not restarted side), they will be |
| * dropped because the tunnel is rendered unusable. */ |
| gtphub_send_del_pdp_ctx(hub, tun, other_side_idx(side_idx)); |
| |
| gtphub_tunnel_endpoint_set_peer(&tun->endpoint[side_idx][GTPH_PLANE_CTRL], |
| NULL); |
| gtphub_tunnel_endpoint_set_peer(&tun->endpoint[side_idx][GTPH_PLANE_USER], |
| NULL); |
| } |
| } |
| |
| if (deleted_count) |
| LOG(LOGL_NOTICE, "Deleting %d tunnels due to restart of: %s\n", |
| deleted_count, |
| gtphub_port_str(pp)); |
| } |
| |
| static int get_restart_count(struct gtp_packet_desc *p) |
| { |
| int ie_idx; |
| ie_idx = gtpie_getie(p->ie, GTPIE_RECOVERY, 0); |
| if (ie_idx < 0) |
| return -1; |
| return ntoh8(p->ie[ie_idx]->tv1.v); |
| } |
| |
| static void gtphub_check_restart_counter(struct gtphub *hub, |
| struct gtp_packet_desc *p, |
| struct gtphub_peer_port *from) |
| { |
| /* If the peer is sending a Recovery IE (7.7.11) with a restart counter |
| * that doesn't match the peer's previously sent restart counter, clear |
| * that peer and cancel PDP contexts. */ |
| |
| int restart = get_restart_count(p); |
| |
| if ((restart < 0) || (restart > 255)) |
| return; |
| |
| if ((from->last_restart_count >= 0) && (from->last_restart_count <= 255)) { |
| if (from->last_restart_count != restart) { |
| gtphub_restarted(hub, p, from); |
| } |
| } |
| |
| from->last_restart_count = restart; |
| } |
| |
| static int from_sgsns_read_cb(struct osmo_fd *from_sgsns_ofd, unsigned int what) |
| { |
| unsigned int plane_idx = from_sgsns_ofd->priv_nr; |
| OSMO_ASSERT(plane_idx < GTPH_PLANE_N); |
| LOG(LOGL_DEBUG, "=== reading from SGSN (%s)\n", |
| gtphub_plane_idx_names[plane_idx]); |
| |
| if (!(what & BSC_FD_READ)) |
| return 0; |
| |
| struct gtphub *hub = from_sgsns_ofd->data; |
| |
| static uint8_t buf[4096]; |
| struct osmo_sockaddr from_addr; |
| struct osmo_sockaddr to_addr; |
| struct osmo_fd *to_ofd; |
| int len; |
| uint8_t *reply_buf; |
| |
| len = gtphub_read(from_sgsns_ofd, &from_addr, buf, sizeof(buf)); |
| if (len < 1) |
| return 0; |
| |
| len = gtphub_handle_buf(hub, GTPH_SIDE_SGSN, plane_idx, &from_addr, |
| buf, len, gtphub_now(), |
| &reply_buf, &to_ofd, &to_addr); |
| if (len < 1) |
| return 0; |
| |
| return gtphub_write(to_ofd, &to_addr, reply_buf, len); |
| } |
| |
| static int from_ggsns_read_cb(struct osmo_fd *from_ggsns_ofd, unsigned int what) |
| { |
| unsigned int plane_idx = from_ggsns_ofd->priv_nr; |
| OSMO_ASSERT(plane_idx < GTPH_PLANE_N); |
| LOG(LOGL_DEBUG, "=== reading from GGSN (%s)\n", |
| gtphub_plane_idx_names[plane_idx]); |
| if (!(what & BSC_FD_READ)) |
| return 0; |
| |
| struct gtphub *hub = from_ggsns_ofd->data; |
| |
| static uint8_t buf[4096]; |
| struct osmo_sockaddr from_addr; |
| struct osmo_sockaddr to_addr; |
| struct osmo_fd *to_ofd; |
| int len; |
| uint8_t *reply_buf; |
| |
| len = gtphub_read(from_ggsns_ofd, &from_addr, buf, sizeof(buf)); |
| if (len < 1) |
| return 0; |
| |
| len = gtphub_handle_buf(hub, GTPH_SIDE_GGSN, plane_idx, &from_addr, |
| buf, len, gtphub_now(), |
| &reply_buf, &to_ofd, &to_addr); |
| if (len < 1) |
| return 0; |
| |
| return gtphub_write(to_ofd, &to_addr, reply_buf, len); |
| } |
| |
| static int gtphub_unmap(struct gtphub *hub, |
| struct gtp_packet_desc *p, |
| struct gtphub_peer_port *from, |
| struct gtphub_peer_port *to_proxy, |
| struct gtphub_peer_port **final_unmapped, |
| struct gtphub_peer_port **unmapped_from_seq) |
| { |
| /* Always (try to) unmap sequence and TEI numbers, which need to be |
| * replaced in the packet. Either way, give precedence to the proxy, if |
| * configured. */ |
| |
| if (unmapped_from_seq) |
| *unmapped_from_seq = NULL; |
| if (final_unmapped) |
| *final_unmapped = NULL; |
| p->tun = NULL; |
| |
| struct gtphub_peer_port *from_seq = NULL; |
| struct gtphub_peer_port *from_tei = NULL; |
| struct gtphub_peer_port *unmapped = NULL; |
| |
| from_seq = gtphub_unmap_seq(p, from); |
| |
| if (gtphub_unmap_header_tei(&from_tei, &p->tun, hub, p, from) < 0) |
| return -1; |
| |
| struct gtphub_peer *from_peer = from->peer_addr->peer; |
| if (from_seq && from_tei && (from_seq != from_tei)) { |
| LOG(LOGL_DEBUG, |
| "Seq unmap and TEI unmap yield two different peers." |
| " Using seq unmap." |
| " (from %s %s: seq %d yields %s, tei %u yields %s)\n", |
| gtphub_plane_idx_names[p->plane_idx], |
| gtphub_peer_str(from_peer), |
| (int)p->seq, |
| gtphub_port_str(from_seq), |
| (unsigned int)p->header_tei_rx, |
| gtphub_port_str2(from_tei) |
| ); |
| } |
| unmapped = (from_seq? from_seq : from_tei); |
| |
| if (unmapped && to_proxy && (unmapped != to_proxy)) { |
| LOG(LOGL_NOTICE, |
| "Unmap yields a different peer than the configured proxy." |
| " Using proxy." |
| " unmapped: %s proxy: %s\n", |
| gtphub_port_str(unmapped), |
| gtphub_port_str2(to_proxy) |
| ); |
| } |
| unmapped = (to_proxy? to_proxy : unmapped); |
| |
| if (!unmapped) { |
| /* Return no error, but returned pointers are all NULL. */ |
| return 0; |
| } |
| |
| if (unmapped_from_seq) |
| *unmapped_from_seq = from_seq; |
| if (final_unmapped) |
| *final_unmapped = unmapped; |
| return 0; |
| } |
| |
| static int gsn_addr_to_sockaddr(struct gsn_addr *src, |
| uint16_t port, |
| struct osmo_sockaddr *dst) |
| { |
| return osmo_sockaddr_init_udp(dst, gsn_addr_to_str(src), port); |
| } |
| |
| /* If p is an Echo request, replace p's data with the matching response and |
| * return 1. If p is no Echo request, return 0, or -1 if an invalid packet is |
| * detected. */ |
| static int gtphub_handle_echo_req(struct gtphub *hub, struct gtp_packet_desc *p, |
| uint8_t **reply_buf) |
| { |
| if (p->type != GTP_ECHO_REQ) |
| return 0; |
| |
| static uint8_t echo_response_data[14] = { |
| 0x32, /* GTP v1 flags */ |
| GTP_ECHO_RSP, |
| 0x00, 14 - 8, /* Length in network byte order */ |
| 0x00, 0x00, 0x00, 0x00, /* Zero TEI */ |
| 0, 0, /* Seq, to be replaced */ |
| 0, 0, /* no extensions */ |
| 0x0e, /* Recovery IE */ |
| 0 /* Restart counter, to be replaced */ |
| }; |
| uint16_t *seq = (uint16_t*)&echo_response_data[8]; |
| uint8_t *recovery = &echo_response_data[13]; |
| |
| *seq = hton16(p->seq); |
| *recovery = hub->restart_counter; |
| |
| *reply_buf = echo_response_data; |
| |
| return sizeof(echo_response_data); |
| } |
| |
| struct gtphub_peer_port *gtphub_known_addr_have_port(const struct gtphub_bind *bind, |
| const struct osmo_sockaddr *addr); |
| |
| /* Parse buffer as GTP packet, replace elements in-place and return the ofd and |
| * address to forward to. Return a pointer to the osmo_fd, but copy the |
| * sockaddr to *to_addr. The reason for this is that the sockaddr may expire at |
| * any moment, while the osmo_fd is guaranteed to persist. Return the number of |
| * bytes to forward, 0 or less on failure. */ |
| int gtphub_handle_buf(struct gtphub *hub, |
| unsigned int side_idx, |
| unsigned int plane_idx, |
| const struct osmo_sockaddr *from_addr, |
| uint8_t *buf, |
| size_t received, |
| time_t now, |
| uint8_t **reply_buf, |
| struct osmo_fd **to_ofd, |
| struct osmo_sockaddr *to_addr) |
| { |
| struct gtphub_bind *from_bind = &hub->to_gsns[side_idx][plane_idx]; |
| struct gtphub_bind *to_bind = &hub->to_gsns[other_side_idx(side_idx)][plane_idx]; |
| |
| rate_ctr_add(&from_bind->counters_io->ctr[GTPH_CTR_BYTES_IN], |
| received); |
| |
| struct gtp_packet_desc p; |
| gtp_decode(buf, received, side_idx, plane_idx, &p, now); |
| |
| LOG(LOGL_DEBUG, "%s rx %s from %s %s%s\n", |
| (side_idx == GTPH_SIDE_GGSN)? "<-" : "->", |
| gtphub_plane_idx_names[plane_idx], |
| gtphub_side_idx_names[side_idx], |
| osmo_sockaddr_to_str(from_addr), |
| gtp_type_str(p.type)); |
| |
| if (p.rc <= 0) { |
| LOG(LOGL_ERROR, "INVALID: dropping GTP packet%s from %s %s %s\n", |
| gtp_type_str(p.type), |
| gtphub_side_idx_names[side_idx], |
| gtphub_plane_idx_names[plane_idx], |
| osmo_sockaddr_to_str(from_addr)); |
| return -1; |
| } |
| |
| rate_ctr_inc(&from_bind->counters_io->ctr[GTPH_CTR_PKTS_IN]); |
| |
| int reply_len; |
| reply_len = gtphub_handle_echo_req(hub, &p, reply_buf); |
| if (reply_len > 0) { |
| /* It was an echo. Nothing left to do. */ |
| osmo_sockaddr_copy(to_addr, from_addr); |
| *to_ofd = &from_bind->ofd; |
| |
| rate_ctr_inc(&from_bind->counters_io->ctr[GTPH_CTR_PKTS_OUT]); |
| rate_ctr_add(&from_bind->counters_io->ctr[GTPH_CTR_BYTES_OUT], |
| reply_len); |
| LOG(LOGL_DEBUG, "%s Echo response to %s: %d bytes to %s\n", |
| (side_idx == GTPH_SIDE_GGSN)? "-->" : "<--", |
| gtphub_side_idx_names[side_idx], |
| (int)reply_len, osmo_sockaddr_to_str(to_addr)); |
| return reply_len; |
| } |
| if (reply_len < 0) |
| return -1; |
| |
| *to_ofd = &to_bind->ofd; |
| |
| /* If a proxy is configured, check that it's indeed that proxy talking |
| * to us. A proxy is a forced 1:1 connection, e.g. to another gtphub, |
| * so no-one else is allowed to talk to us from that side. */ |
| struct gtphub_peer_port *from_peer = hub->proxy[side_idx][plane_idx]; |
| if (from_peer) { |
| if (osmo_sockaddr_cmp(&from_peer->sa, from_addr) != 0) { |
| LOG(LOGL_ERROR, |
| "Rejecting: %s proxy configured, but GTP packet" |
| " received on %s bind is from another sender:" |
| " proxy: %s sender: %s\n", |
| gtphub_side_idx_names[side_idx], |
| gtphub_side_idx_names[side_idx], |
| gtphub_port_str(from_peer), |
| osmo_sockaddr_to_str(from_addr)); |
| return -1; |
| } |
| } |
| |
| if (!from_peer) { |
| /* Find or create a peer with a matching address. The sender's |
| * port may in fact differ. */ |
| from_peer = gtphub_known_addr_have_port(from_bind, from_addr); |
| } |
| |
| /* If any PDP context has been created, we already have an entry for |
| * this GSN. If we don't have an entry, a GGSN has nothing to tell us |
| * about, while an SGSN may initiate a PDP context. */ |
| if (!from_peer) { |
| if (side_idx == GTPH_SIDE_GGSN) { |
| LOG(LOGL_ERROR, "Dropping packet%s: unknown GGSN peer: %s\n", |
| gtp_type_str(p.type), |
| osmo_sockaddr_to_str(from_addr)); |
| return -1; |
| } else { |
| /* SGSN */ |
| /* A new peer. If this is on the Ctrl plane, an SGSN |
| * may make first contact without being known yet, so |
| * create the peer struct for the current sender. */ |
| if (plane_idx != GTPH_PLANE_CTRL) { |
| LOG(LOGL_ERROR, |
| "Dropping packet%s: User plane peer was not" |
| "announced by PDP Context: %s\n", |
| gtp_type_str(p.type), |
| osmo_sockaddr_to_str(from_addr)); |
| return -1; |
| } |
| |
| struct gsn_addr from_gsna; |
| uint16_t from_port; |
| if (gsn_addr_from_sockaddr(&from_gsna, &from_port, from_addr) != 0) |
| return -1; |
| |
| from_peer = gtphub_port_have(hub, from_bind, &from_gsna, from_port); |
| } |
| } |
| |
| if (!from_peer) { |
| /* This could theoretically happen for invalid address data or |
| * somesuch. */ |
| LOG(LOGL_ERROR, "Dropping packet%s: invalid %s peer: %s\n", |
| gtp_type_str(p.type), |
| gtphub_side_idx_names[side_idx], |
| osmo_sockaddr_to_str(from_addr)); |
| return -1; |
| } |
| |
| rate_ctr_add(&from_peer->counters_io->ctr[GTPH_CTR_BYTES_IN], |
| received); |
| rate_ctr_inc(&from_peer->counters_io->ctr[GTPH_CTR_PKTS_IN]); |
| |
| LOG(LOGL_DEBUG, "from %s peer: %s\n", gtphub_side_idx_names[side_idx], |
| gtphub_port_str(from_peer)); |
| |
| gtphub_check_restart_counter(hub, &p, from_peer); |
| gtphub_map_restart_counter(hub, &p); |
| |
| struct gtphub_peer_port *to_peer_from_seq; |
| struct gtphub_peer_port *to_peer; |
| if (gtphub_unmap(hub, &p, from_peer, |
| hub->proxy[other_side_idx(side_idx)][plane_idx], |
| &to_peer, &to_peer_from_seq) |
| != 0) { |
| return -1; |
| } |
| |
| if (p.tun) { |
| struct gtphub_tunnel_endpoint *te = &p.tun->endpoint[p.side_idx][p.plane_idx]; |
| rate_ctr_add(&te->counters_io->ctr[GTPH_CTR_BYTES_IN], |
| received); |
| rate_ctr_inc(&te->counters_io->ctr[GTPH_CTR_PKTS_IN]); |
| } |
| |
| if ((!to_peer) && (side_idx == GTPH_SIDE_SGSN)) { |
| if (gtphub_resolve_ggsn(hub, &p, &to_peer) < 0) |
| return -1; |
| } |
| |
| if (!to_peer && p.tun && p.type == GTP_DELETE_PDP_RSP) { |
| /* It's a delete confirmation for a tunnel that is partly |
| * invalid, probably marked unsuable due to a restarted peer. |
| * Remove the tunnel and be happy without forwarding. */ |
| expiring_item_del(&p.tun->expiry_entry); |
| p.tun = NULL; |
| return 0; |
| } |
| |
| if (!to_peer) { |
| LOG(LOGL_ERROR, "No %s to send to. Dropping packet%s" |
| " (type=%" PRIu8 ", header-TEI=%" PRIx32 ", seq=%" PRIx16 ").\n", |
| gtphub_side_idx_names[other_side_idx(side_idx)], |
| gtp_type_str(p.type), |
| p.type, p.header_tei_rx, p.seq |
| ); |
| return -1; |
| } |
| |
| if (plane_idx == GTPH_PLANE_CTRL) { |
| /* This may be a Create PDP Context response. If it is, there |
| * are other addresses in the GTP message to set up apart from |
| * the sender. */ |
| if (gtphub_handle_pdp_ctx(hub, &p, from_peer, to_peer) |
| != 0) |
| return -1; |
| } |
| |
| /* Either to_peer was resolved from an existing tunnel, |
| * or a PDP Ctx and thus a tunnel has just been created, |
| * or the tunnel has been deleted due to this message. */ |
| OSMO_ASSERT(p.tun || (p.type == GTP_DELETE_PDP_RSP)); |
| |
| /* If the GGSN is replying to an SGSN request, the sequence nr has |
| * already been unmapped above (to_peer_from_seq != NULL), and we need not |
| * create a new mapping. */ |
| if (!to_peer_from_seq) |
| gtphub_map_seq(&p, from_peer, to_peer); |
| |
| osmo_sockaddr_copy(to_addr, &to_peer->sa); |
| |
| *reply_buf = (uint8_t*)p.data; |
| |
| if (received) { |
| rate_ctr_inc(&to_bind->counters_io->ctr[GTPH_CTR_PKTS_OUT]); |
| rate_ctr_add(&to_bind->counters_io->ctr[GTPH_CTR_BYTES_OUT], |
| received); |
| |
| rate_ctr_inc(&to_peer->counters_io->ctr[GTPH_CTR_PKTS_OUT]); |
| rate_ctr_add(&to_peer->counters_io->ctr[GTPH_CTR_BYTES_OUT], |
| received); |
| } |
| |
| if (p.tun) { |
| struct gtphub_tunnel_endpoint *te = &p.tun->endpoint[other_side_idx(p.side_idx)][p.plane_idx]; |
| rate_ctr_inc(&te->counters_io->ctr[GTPH_CTR_PKTS_OUT]); |
| rate_ctr_add(&te->counters_io->ctr[GTPH_CTR_BYTES_OUT], |
| received); |
| } |
| |
| LOG(LOGL_DEBUG, "%s Forward to %s:" |
| " header-TEI %" PRIx32", seq %" PRIx16", %d bytes to %s\n", |
| (side_idx == GTPH_SIDE_SGSN)? "-->" : "<--", |
| gtphub_side_idx_names[other_side_idx(side_idx)], |
| p.header_tei, p.seq, |
| (int)received, osmo_sockaddr_to_str(to_addr)); |
| return received; |
| } |
| |
| static void resolved_gssn_del_cb(struct expiring_item *expi) |
| { |
| struct gtphub_resolved_ggsn *ggsn; |
| ggsn = container_of(expi, struct gtphub_resolved_ggsn, expiry_entry); |
| |
| gtphub_port_ref_count_dec(ggsn->peer); |
| llist_del(&ggsn->entry); |
| |
| ggsn->expiry_entry.del_cb = 0; |
| expiring_item_del(&ggsn->expiry_entry); |
| |
| talloc_free(ggsn); |
| } |
| |
| void gtphub_resolved_ggsn(struct gtphub *hub, const char *apn_oi_str, |
| struct gsn_addr *resolved_addr, |
| time_t now) |
| { |
| struct gtphub_peer_port *pp; |
| struct gtphub_resolved_ggsn *ggsn; |
| |
| LOG(LOGL_DEBUG, "Resolved GGSN callback: %s %s\n", |
| apn_oi_str, osmo_hexdump((unsigned char*)resolved_addr, |
| sizeof(*resolved_addr))); |
| |
| pp = gtphub_port_have(hub, &hub->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL], |
| resolved_addr, 2123); |
| if (!pp) { |
| LOG(LOGL_ERROR, "Internal: Cannot create/find peer '%s'\n", |
| gsn_addr_to_str(resolved_addr)); |
| return; |
| } |
| |
| ggsn = talloc_zero(osmo_gtphub_ctx, struct gtphub_resolved_ggsn); |
| OSMO_ASSERT(ggsn); |
| INIT_LLIST_HEAD(&ggsn->entry); |
| expiring_item_init(&ggsn->expiry_entry); |
| |
| ggsn->peer = pp; |
| gtphub_port_ref_count_inc(pp); |
| |
| strncpy(ggsn->apn_oi_str, apn_oi_str, sizeof(ggsn->apn_oi_str)); |
| ggsn->apn_oi_str[sizeof(ggsn->apn_oi_str) - 1] = '\0'; |
| |
| ggsn->expiry_entry.del_cb = resolved_gssn_del_cb; |
| expiry_add(&hub->expire_slowly, &ggsn->expiry_entry, now); |
| |
| llist_add(&ggsn->entry, &hub->resolved_ggsns); |
| } |
| |
| static int gtphub_gc_peer_port(struct gtphub_peer_port *pp) |
| { |
| return pp->ref_count == 0; |
| } |
| |
| static int gtphub_gc_peer_addr(struct gtphub_peer_addr *pa) |
| { |
| struct gtphub_peer_port *pp, *npp; |
| llist_for_each_entry_safe(pp, npp, &pa->ports, entry) { |
| if (gtphub_gc_peer_port(pp)) { |
| LOG(LOGL_DEBUG, "expired: peer %s\n", |
| gtphub_port_str(pp)); |
| gtphub_peer_port_del(pp); |
| } |
| } |
| return llist_empty(&pa->ports); |
| } |
| |
| static int gtphub_gc_peer(struct gtphub_peer *p) |
| { |
| struct gtphub_peer_addr *pa, *npa; |
| llist_for_each_entry_safe(pa, npa, &p->addresses, entry) { |
| if (gtphub_gc_peer_addr(pa)) { |
| gtphub_peer_addr_del(pa); |
| } |
| } |
| |
| /* Note that there's a ref_count in each gtphub_peer_port instance |
| * listed within p->addresses, referenced by TEI mappings from |
| * hub->tei_map. As long as those don't expire, this peer will stay. */ |
| |
| return llist_empty(&p->addresses) |
| && nr_map_empty(&p->seq_map); |
| } |
| |
| static void gtphub_gc_bind(struct gtphub_bind *b) |
| { |
| struct gtphub_peer *p, *n; |
| llist_for_each_entry_safe(p, n, &b->peers, entry) { |
| if (gtphub_gc_peer(p)) { |
| gtphub_peer_del(p); |
| } |
| } |
| } |
| |
| void gtphub_gc(struct gtphub *hub, time_t now) |
| { |
| int expired; |
| expired = expiry_tick(&hub->expire_quickly, now); |
| expired += expiry_tick(&hub->expire_slowly, now); |
| |
| /* ... */ |
| |
| if (expired) { |
| int s, p; |
| for_each_side_and_plane(s, p) { |
| gtphub_gc_bind(&hub->to_gsns[s][p]); |
| } |
| } |
| } |
| |
| static void gtphub_gc_cb(void *data) |
| { |
| struct gtphub *hub = data; |
| gtphub_gc(hub, gtphub_now()); |
| osmo_timer_schedule(&hub->gc_timer, GTPH_GC_TICK_SECONDS, 0); |
| } |
| |
| static void gtphub_gc_start(struct gtphub *hub) |
| { |
| hub->gc_timer.cb = gtphub_gc_cb; |
| hub->gc_timer.data = hub; |
| |
| osmo_timer_schedule(&hub->gc_timer, GTPH_GC_TICK_SECONDS, 0); |
| } |
| |
| /* called by unit tests */ |
| void gtphub_init(struct gtphub *hub) |
| { |
| gtphub_zero(hub); |
| |
| INIT_LLIST_HEAD(&hub->tunnels); |
| INIT_LLIST_HEAD(&hub->pending_deletes); |
| |
| expiry_init(&hub->expire_quickly, GTPH_EXPIRE_QUICKLY_SECS); |
| expiry_init(&hub->expire_slowly, GTPH_EXPIRE_SLOWLY_MINUTES * 60); |
| |
| nr_pool_init(&hub->tei_pool, 1, 0xffffffff); |
| |
| int side_idx; |
| int plane_idx; |
| for_each_side_and_plane(side_idx, plane_idx) { |
| gtphub_bind_init(&hub->to_gsns[side_idx][plane_idx]); |
| } |
| |
| hub->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].label = "SGSN Ctrl"; |
| hub->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].label = "GGSN Ctrl"; |
| hub->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_USER].label = "SGSN User"; |
| hub->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_USER].label = "GGSN User"; |
| } |
| |
| /* For the test suite, this is kept separate from gtphub_stop(), which also |
| * closes sockets. The test suite avoids using sockets and would cause |
| * segfaults when trying to close uninitialized ofds. */ |
| void gtphub_free(struct gtphub *hub) |
| { |
| /* By expiring all mappings, a garbage collection should free |
| * everything else. A gtphub_bind_free() will assert that everything is |
| * indeed empty. */ |
| expiry_clear(&hub->expire_quickly); |
| expiry_clear(&hub->expire_slowly); |
| |
| int side_idx; |
| int plane_idx; |
| for_each_side_and_plane(side_idx, plane_idx) { |
| gtphub_gc_bind(&hub->to_gsns[side_idx][plane_idx]); |
| gtphub_bind_free(&hub->to_gsns[side_idx][plane_idx]); |
| } |
| } |
| |
| void gtphub_stop(struct gtphub *hub) |
| { |
| int side_idx; |
| int plane_idx; |
| for_each_side_and_plane(side_idx, plane_idx) { |
| gtphub_bind_stop(&hub->to_gsns[side_idx][plane_idx]); |
| } |
| gtphub_free(hub); |
| } |
| |
| static int gtphub_make_proxy(struct gtphub *hub, |
| struct gtphub_peer_port **pp, |
| struct gtphub_bind *bind, |
| const struct gtphub_cfg_addr *addr) |
| { |
| if (!addr->addr_str) |
| return 0; |
| |
| struct gsn_addr gsna; |
| if (gsn_addr_from_str(&gsna, addr->addr_str) != 0) |
| return -1; |
| |
| *pp = gtphub_port_have(hub, bind, &gsna, addr->port); |
| |
| /* This is *the* proxy. Make sure it is never expired. */ |
| gtphub_port_ref_count_inc(*pp); |
| return 0; |
| } |
| |
| int gtphub_start(struct gtphub *hub, struct gtphub_cfg *cfg, |
| uint8_t restart_counter) |
| { |
| gtphub_init(hub); |
| |
| hub->restart_counter = restart_counter; |
| hub->sgsn_use_sender = cfg->sgsn_use_sender? 1 : 0; |
| |
| /* If a Ctrl plane proxy is configured, ares will never be used. */ |
| if (!cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].addr_str) { |
| if (gtphub_ares_init(hub) != 0) { |
| LOG(LOGL_FATAL, "Failed to initialize ares\n"); |
| return -1; |
| } |
| } |
| |
| int side_idx; |
| int plane_idx; |
| for_each_side_and_plane(side_idx, plane_idx) { |
| int rc; |
| rc = gtphub_bind_start(&hub->to_gsns[side_idx][plane_idx], |
| &cfg->to_gsns[side_idx][plane_idx], |
| (side_idx == GTPH_SIDE_SGSN) |
| ? from_sgsns_read_cb |
| : from_ggsns_read_cb, |
| hub, plane_idx); |
| if (rc) { |
| LOG(LOGL_FATAL, "Failed to bind for %ss (%s)\n", |
| gtphub_side_idx_names[side_idx], |
| gtphub_plane_idx_names[plane_idx]); |
| return rc; |
| } |
| } |
| |
| for_each_side_and_plane(side_idx, plane_idx) { |
| if (gtphub_make_proxy(hub, |
| &hub->proxy[side_idx][plane_idx], |
| &hub->to_gsns[side_idx][plane_idx], |
| &cfg->proxy[side_idx][plane_idx]) |
| != 0) { |
| LOG(LOGL_FATAL, "Cannot configure %s proxy" |
| " %s port %d.\n", |
| gtphub_side_idx_names[side_idx], |
| cfg->proxy[side_idx][plane_idx].addr_str, |
| (int)cfg->proxy[side_idx][plane_idx].port); |
| return -1; |
| } |
| } |
| |
| for_each_side_and_plane(side_idx, plane_idx) { |
| if (hub->proxy[side_idx][plane_idx]) |
| LOG(LOGL_NOTICE, "Using %s %s proxy %s\n", |
| gtphub_side_idx_names[side_idx], |
| gtphub_plane_idx_names[plane_idx], |
| gtphub_port_str(hub->proxy[side_idx][plane_idx])); |
| } |
| |
| if (hub->sgsn_use_sender) |
| LOG(LOGL_NOTICE, "Using sender address and port for SGSN instead of GSN Addr IE and default ports.\n"); |
| |
| gtphub_gc_start(hub); |
| return 0; |
| } |
| |
| static struct gtphub_peer_addr *gtphub_peer_find_addr(const struct gtphub_peer *peer, |
| const struct gsn_addr *addr) |
| { |
| struct gtphub_peer_addr *a; |
| llist_for_each_entry(a, &peer->addresses, entry) { |
| if (gsn_addr_same(&a->addr, addr)) |
| return a; |
| } |
| return NULL; |
| } |
| |
| static struct gtphub_peer_port *gtphub_addr_find_port(const struct gtphub_peer_addr *a, |
| uint16_t port) |
| { |
| OSMO_ASSERT(port); |
| struct gtphub_peer_port *pp; |
| llist_for_each_entry(pp, &a->ports, entry) { |
| if (pp->port == port) |
| return pp; |
| } |
| return NULL; |
| } |
| |
| static struct gtphub_peer_addr *gtphub_addr_find(const struct gtphub_bind *bind, |
| const struct gsn_addr *addr) |
| { |
| struct gtphub_peer *peer; |
| llist_for_each_entry(peer, &bind->peers, entry) { |
| struct gtphub_peer_addr *a = gtphub_peer_find_addr(peer, addr); |
| if (a) |
| return a; |
| } |
| return NULL; |
| } |
| |
| static struct gtphub_peer_port *gtphub_port_find(const struct gtphub_bind *bind, |
| const struct gsn_addr *addr, |
| uint16_t port) |
| { |
| struct gtphub_peer_addr *a = gtphub_addr_find(bind, addr); |
| if (!a) |
| return NULL; |
| return gtphub_addr_find_port(a, port); |
| } |
| |
| struct gtphub_peer_port *gtphub_port_find_sa(const struct gtphub_bind *bind, |
| const struct osmo_sockaddr *addr) |
| { |
| struct gsn_addr gsna; |
| uint16_t port; |
| gsn_addr_from_sockaddr(&gsna, &port, addr); |
| return gtphub_port_find(bind, &gsna, port); |
| } |
| |
| static struct gtphub_peer *gtphub_peer_new(struct gtphub *hub, |
| struct gtphub_bind *bind) |
| { |
| struct gtphub_peer *peer = talloc_zero(osmo_gtphub_ctx, |
| struct gtphub_peer); |
| OSMO_ASSERT(peer); |
| |
| INIT_LLIST_HEAD(&peer->addresses); |
| |
| nr_pool_init(&peer->seq_pool, 0, 0xffff); |
| nr_map_init(&peer->seq_map, &peer->seq_pool, &hub->expire_quickly); |
| |
| /* TODO use something random to pick the initial sequence nr. |
| 0x6d31 produces the ASCII character sequence 'm1', currently used in |
| gtphub_nc_test.sh. */ |
| peer->seq_pool.last_nr = 0x6d31 - 1; |
| |
| llist_add(&peer->entry, &bind->peers); |
| return peer; |
| } |
| |
| static struct gtphub_peer_addr *gtphub_peer_add_addr(struct gtphub_peer *peer, |
| const struct gsn_addr *addr) |
| { |
| struct gtphub_peer_addr *a; |
| a = talloc_zero(osmo_gtphub_ctx, struct gtphub_peer_addr); |
| OSMO_ASSERT(a); |
| a->peer = peer; |
| gsn_addr_copy(&a->addr, addr); |
| INIT_LLIST_HEAD(&a->ports); |
| llist_add(&a->entry, &peer->addresses); |
| |
| return a; |
| } |
| |
| static struct gtphub_peer_addr *gtphub_addr_have(struct gtphub *hub, |
| struct gtphub_bind *bind, |
| const struct gsn_addr *addr) |
| { |
| struct gtphub_peer_addr *a = gtphub_addr_find(bind, addr); |
| if (a) |
| return a; |
| |
| /* If we haven't found an address, that means we need to create an |
| * entirely new peer for the new address. More addresses may be added |
| * to this peer later, but not via this function. */ |
| struct gtphub_peer *peer = gtphub_peer_new(hub, bind); |
| |
| a = gtphub_peer_add_addr(peer, addr); |
| |
| LOG(LOGL_DEBUG, "New peer address: %s %s\n", |
| bind->label, |
| gsn_addr_to_str(&a->addr)); |
| |
| return a; |
| } |
| |
| static struct gtphub_peer_port *gtphub_addr_add_port(struct gtphub_peer_addr *a, |
| uint16_t port) |
| { |
| struct gtphub_peer_port *pp; |
| |
| pp = talloc_zero(osmo_gtphub_ctx, struct gtphub_peer_port); |
| OSMO_ASSERT(pp); |
| pp->peer_addr = a; |
| pp->port = port; |
| pp->last_restart_count = -1; |
| |
| if (gsn_addr_to_sockaddr(&a->addr, port, &pp->sa) != 0) { |
| talloc_free(pp); |
| return NULL; |
| } |
| |
| pp->counters_io = rate_ctr_group_alloc(osmo_gtphub_ctx, |
| >phub_ctrg_io_desc, 0); |
| |
| llist_add(&pp->entry, &a->ports); |
| |
| LOG(LOGL_DEBUG, "New peer port: %s port %d\n", |
| gsn_addr_to_str(&a->addr), |
| (int)port); |
| |
| return pp; |
| } |
| |
| struct gtphub_peer_port *gtphub_port_have(struct gtphub *hub, |
| struct gtphub_bind *bind, |
| const struct gsn_addr *addr, |
| uint16_t port) |
| { |
| struct gtphub_peer_addr *a = gtphub_addr_have(hub, bind, addr); |
| |
| struct gtphub_peer_port *pp = gtphub_addr_find_port(a, port); |
| if (pp) |
| return pp; |
| |
| return gtphub_addr_add_port(a, port); |
| } |
| |
| /* Find a GGSN peer with a matching address. If the address is known but the |
| * port not, create a new port for that peer address. */ |
| struct gtphub_peer_port *gtphub_known_addr_have_port(const struct gtphub_bind *bind, |
| const struct osmo_sockaddr *addr) |
| { |
| struct gtphub_peer_addr *pa; |
| struct gtphub_peer_port *pp; |
| |
| struct gsn_addr gsna; |
| uint16_t port; |
| gsn_addr_from_sockaddr(&gsna, &port, addr); |
| |
| pa = gtphub_addr_find(bind, &gsna); |
| if (!pa) |
| return NULL; |
| |
| pp = gtphub_addr_find_port(pa, port); |
| |
| if (!pp) |
| pp = gtphub_addr_add_port(pa, port); |
| |
| return pp; |
| } |
| |
| |
| /* Return 0 if the message in p is not applicable for GGSN resolution, -1 if |
| * resolution should be possible but failed, and 1 if resolution was |
| * successful. *pp will be set to NULL if <1 is returned. */ |
| static int gtphub_resolve_ggsn(struct gtphub *hub, |
| struct gtp_packet_desc *p, |
| struct gtphub_peer_port **pp) |
| { |
| *pp = NULL; |
| |
| /* TODO determine from message type whether IEs should be present? */ |
| |
| int rc; |
| const char *imsi_str; |
| rc = get_ie_imsi_str(p->ie, 0, &imsi_str); |
| if (rc < 1) |
| return rc; |
| OSMO_ASSERT(imsi_str); |
| |
| const char *apn_str; |
| rc = get_ie_apn_str(p->ie, &apn_str); |
| if (rc < 1) |
| return rc; |
| OSMO_ASSERT(apn_str); |
| |
| *pp = gtphub_resolve_ggsn_addr(hub, imsi_str, apn_str); |
| return (*pp)? 1 : -1; |
| } |
| |
| |
| /* TODO move to osmocom/core/socket.c ? */ |
| /* use this in osmo_sock_init() to remove dup. */ |
| /* Internal: call getaddrinfo for osmo_sockaddr_init(). The caller is required |
| to call freeaddrinfo(*result), iff zero is returned. */ |
| static int _osmo_getaddrinfo(struct addrinfo **result, |
| uint16_t family, uint16_t type, uint8_t proto, |
| const char *host, uint16_t port) |
| { |
| struct addrinfo hints; |
| char portbuf[16]; |
| |
| sprintf(portbuf, "%u", port); |
| memset(&hints, '\0', sizeof(struct addrinfo)); |
| hints.ai_family = family; |
| if (type == SOCK_RAW) { |
| /* Workaround for glibc, that returns EAI_SERVICE (-8) if |
| * SOCK_RAW and IPPROTO_GRE is used. |
| */ |
| hints.ai_socktype = SOCK_DGRAM; |
| hints.ai_protocol = IPPROTO_UDP; |
| } else { |
| hints.ai_socktype = type; |
| hints.ai_protocol = proto; |
| } |
| |
| return getaddrinfo(host, portbuf, &hints, result); |
| } |
| |
| /* TODO move to osmocom/core/socket.c ? */ |
| int osmo_sockaddr_init(struct osmo_sockaddr *addr, |
| uint16_t family, uint16_t type, uint8_t proto, |
| const char *host, uint16_t port) |
| { |
| struct addrinfo *res; |
| int rc; |
| rc = _osmo_getaddrinfo(&res, family, type, proto, host, port); |
| |
| if (rc != 0) { |
| LOG(LOGL_ERROR, "getaddrinfo returned error %d\n", (int)rc); |
| return -EINVAL; |
| } |
| |
| OSMO_ASSERT(res->ai_addrlen <= sizeof(addr->a)); |
| memcpy(&addr->a, res->ai_addr, res->ai_addrlen); |
| addr->l = res->ai_addrlen; |
| freeaddrinfo(res); |
| |
| return 0; |
| } |
| |
| int osmo_sockaddr_to_strs(char *addr_str, size_t addr_str_len, |
| char *port_str, size_t port_str_len, |
| const struct osmo_sockaddr *addr, |
| int flags) |
| { |
| int rc; |
| |
| if ((addr->l < 1) || (addr->l > sizeof(addr->a))) { |
| LOGP(DGTPHUB, LOGL_ERROR, "Invalid address size: %d\n", addr->l); |
| return -1; |
| } |
| |
| if (addr->l > sizeof(addr->a)) { |
| LOGP(DGTPHUB, LOGL_ERROR, "Invalid address: too long: %d\n", |
| addr->l); |
| return -1; |
| } |
| |
| rc = getnameinfo((struct sockaddr*)&addr->a, addr->l, |
| addr_str, addr_str_len, |
| port_str, port_str_len, |
| flags); |
| |
| if (rc) |
| LOGP(DGTPHUB, LOGL_ERROR, "Invalid address: %s: %s\n", |
| gai_strerror(rc), osmo_hexdump((uint8_t*)&addr->a, |
| addr->l)); |
| |
| return rc; |
| } |
| |
| const char *osmo_sockaddr_to_strb(const struct osmo_sockaddr *addr, |
| char *buf, size_t buf_len) |
| { |
| const int portbuf_len = 6; |
| OSMO_ASSERT(buf_len > portbuf_len); |
| char *portbuf = buf + buf_len - portbuf_len; |
| buf_len -= portbuf_len; |
| if (osmo_sockaddr_to_strs(buf, buf_len, |
| portbuf, portbuf_len, |
| addr, |
| NI_NUMERICHOST | NI_NUMERICSERV)) |
| return NULL; |
| |
| char *pos = buf + strnlen(buf, buf_len-1); |
| size_t len = buf_len - (pos - buf); |
| |
| snprintf(pos, len, " port %s", portbuf); |
| buf[buf_len-1] = '\0'; |
| |
| return buf; |
| } |
| |
| const char *osmo_sockaddr_to_str(const struct osmo_sockaddr *addr) |
| { |
| static char buf[256]; |
| const char *result = osmo_sockaddr_to_strb(addr, buf, sizeof(buf)); |
| if (! result) |
| return "(invalid)"; |
| return result; |
| } |
| |
| int osmo_sockaddr_cmp(const struct osmo_sockaddr *a, |
| const struct osmo_sockaddr *b) |
| { |
| if (a == b) |
| return 0; |
| if (!a) |
| return -1; |
| if (!b) |
| return 1; |
| if (a->l != b->l) { |
| /* Lengths are not the same, but determine the order. Will |
| * anyone ever sort a list by osmo_sockaddr though...? */ |
| int cmp = memcmp(&a->a, &b->a, (a->l < b->l)? a->l : b->l); |
| if (cmp == 0) { |
| if (a->l < b->l) |
| return -1; |
| else |
| return 1; |
| } |
| return cmp; |
| } |
| return memcmp(&a->a, &b->a, a->l); |
| } |
| |
| void osmo_sockaddr_copy(struct osmo_sockaddr *dst, |
| const struct osmo_sockaddr *src) |
| { |
| OSMO_ASSERT(src->l <= sizeof(dst->a)); |
| memcpy(&dst->a, &src->a, src->l); |
| dst->l = src->l; |
| } |