diff options
Diffstat (limited to 'src/gsmtap_util.c')
| -rw-r--r-- | src/gsmtap_util.c | 192 |
1 files changed, 106 insertions, 86 deletions
diff --git a/src/gsmtap_util.c b/src/gsmtap_util.c index e0bc848c..15426358 100644 --- a/src/gsmtap_util.c +++ b/src/gsmtap_util.c @@ -1,6 +1,6 @@ -/* GSMTAP output for Osmocom Layer2 (will only work on the host PC) */ +/* GSMTAP support code in libmsomcore */ /* - * (C) 2010 by Harald Welte <laforge@gnumonks.org> + * (C) 2010-2011 by Harald Welte <laforge@gnumonks.org> * * All Rights Reserved * @@ -22,18 +22,19 @@ #include "../config.h" -#ifdef HAVE_SYS_SELECT_H - #include <osmocom/core/gsmtap_util.h> #include <osmocom/core/logging.h> #include <osmocom/core/gsmtap.h> #include <osmocom/core/msgb.h> +#include <osmocom/core/talloc.h> #include <osmocom/core/select.h> +#include <osmocom/core/socket.h> #include <osmocom/gsm/protocol/gsm_04_08.h> #include <osmocom/gsm/rsl.h> #include <arpa/inet.h> #include <sys/socket.h> +#include <sys/types.h> #include <netinet/in.h> #include <stdio.h> @@ -42,10 +43,6 @@ #include <string.h> #include <errno.h> -static struct osmo_fd gsmtap_bfd = { .fd = -1 }; -static struct osmo_fd gsmtap_sink_bfd = { .fd = -1 }; -static LLIST_HEAD(gsmtap_txqueue); - uint8_t chantype_rsl2gsmtap(uint8_t rsl_chantype, uint8_t link_id) { uint8_t ret = GSMTAP_CHANNEL_UNKNOWN; @@ -114,44 +111,82 @@ struct msgb *gsmtap_makemsg(uint16_t arfcn, uint8_t ts, uint8_t chan_type, return msg; } +/* Open a GSMTAP source (sending) socket, conncet it to host/port and + * return resulting fd */ +int gsmtap_source_init_fd(const char *host, uint16_t port) +{ + if (port == 0) + port = GSMTAP_UDP_PORT; + if (host == NULL) + host = "localhost"; + + return osmo_sock_init(AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, host, port, 0); +} + +int gsmtap_source_add_sink_fd(int gsmtap_fd) +{ + struct sockaddr_storage ss; + socklen_t ss_len = sizeof(ss); + int rc; + + rc = getpeername(gsmtap_fd, (struct sockaddr *)&ss, &ss_len); + if (rc < 0) + return rc; + + if (osmo_sockaddr_is_local((struct sockaddr *)&ss, ss_len) == 1) { + rc = osmo_sock_init_sa((struct sockaddr *)&ss, SOCK_DGRAM, IPPROTO_UDP, 1); + if (rc >= 0) + return rc; + } + + return -ENODEV; +} + +#ifdef HAVE_SYS_SELECT_H + +int gsmtap_sendmsg(struct gsmtap_inst *gti, struct msgb *msg) +{ + if (gti->ofd_wq_mode) + return osmo_wqueue_enqueue(>i->wq, msg); + else { + /* try immediate send and return error if any */ + int rc; + + rc = write(gsmtap_inst_fd(gti), msg->data, msg->len); + if (rc <= 0) { + return rc; + } else if (rc >= msg->len) { + msgb_free(msg); + return 0; + } else { + /* short write */ + return -EIO; + } + } +} + /* receive a message from L1/L2 and put it in GSMTAP */ -int gsmtap_sendmsg(uint16_t arfcn, uint8_t ts, uint8_t chan_type, uint8_t ss, - uint32_t fn, int8_t signal_dbm, uint8_t snr, - const uint8_t *data, unsigned int len) +int gsmtap_send(struct gsmtap_inst *gti, uint16_t arfcn, uint8_t ts, + uint8_t chan_type, uint8_t ss, uint32_t fn, + int8_t signal_dbm, uint8_t snr, const uint8_t *data, + unsigned int len) { struct msgb *msg; - /* gsmtap was never initialized, so don't try to send anything */ - if (gsmtap_bfd.fd == -1) - return 0; - msg = gsmtap_makemsg(arfcn, ts, chan_type, ss, fn, signal_dbm, snr, data, len); if (!msg) return -ENOMEM; - msgb_enqueue(&gsmtap_txqueue, msg); - gsmtap_bfd.when |= BSC_FD_WRITE; - - return 0; + return gsmtap_sendmsg(gti, msg); } /* Callback from select layer if we can write to the socket */ -static int gsmtap_fd_cb(struct osmo_fd *fd, unsigned int flags) +static int gsmtap_wq_w_cb(struct osmo_fd *ofd, struct msgb *msg) { - struct msgb *msg; int rc; - if (!(flags & BSC_FD_WRITE)) - return 0; - - msg = msgb_dequeue(&gsmtap_txqueue); - if (!msg) { - /* no more messages in the queue, disable READ cb */ - gsmtap_bfd.when = 0; - return 0; - } - rc = write(gsmtap_bfd.fd, msg->data, msg->len); + rc = write(ofd->fd, msg->data, msg->len); if (rc < 0) { perror("writing msgb to gsmtap fd"); msgb_free(msg); @@ -167,37 +202,6 @@ static int gsmtap_fd_cb(struct osmo_fd *fd, unsigned int flags) return 0; } -int gsmtap_init(uint32_t dst_ip) -{ - int rc; - struct sockaddr_in sin; - - sin.sin_family = AF_INET; - sin.sin_port = htons(GSMTAP_UDP_PORT); - sin.sin_addr.s_addr = htonl(dst_ip); - - /* create socket */ - rc = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); - if (rc < 0) { - perror("creating UDP socket"); - return rc; - } - gsmtap_bfd.fd = rc; - rc = connect(rc, (struct sockaddr *)&sin, sizeof(sin)); - if (rc < 0) { - perror("connecting UDP socket"); - close(gsmtap_bfd.fd); - gsmtap_bfd.fd = -1; - return rc; - } - - gsmtap_bfd.when = BSC_FD_WRITE; - gsmtap_bfd.cb = gsmtap_fd_cb; - gsmtap_bfd.data = NULL; - - return osmo_fd_register(&gsmtap_bfd); -} - /* Callback from select layer if we can read from the sink socket */ static int gsmtap_sink_fd_cb(struct osmo_fd *fd, unsigned int flags) { @@ -217,37 +221,53 @@ static int gsmtap_sink_fd_cb(struct osmo_fd *fd, unsigned int flags) return 0; } -/* Create a local 'gsmtap sink' avoiding the UDP packets being rejected - * with ICMP reject messages */ -int gsmtap_sink_init(uint32_t bind_ip) +/* Add a local sink to an existing GSMTAP source instance */ +int gsmtap_source_add_sink(struct gsmtap_inst *gti) { - int rc; - struct sockaddr_in sin; + int fd; - sin.sin_family = AF_INET; - sin.sin_port = htons(GSMTAP_UDP_PORT); - sin.sin_addr.s_addr = htonl(bind_ip); + fd = gsmtap_source_add_sink_fd(gsmtap_inst_fd(gti)); + if (fd < 0) + return fd; - rc = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); - if (rc < 0) { - perror("creating UDP socket"); - return rc; - } - gsmtap_sink_bfd.fd = rc; - rc = bind(rc, (struct sockaddr *)&sin, sizeof(sin)); - if (rc < 0) { - perror("binding UDP socket"); - close(gsmtap_sink_bfd.fd); - gsmtap_sink_bfd.fd = -1; - return rc; + if (gti->ofd_wq_mode) { + struct osmo_fd *sink_ofd; + + sink_ofd = >i->sink_ofd; + sink_ofd->fd = fd; + sink_ofd->when = BSC_FD_READ; + sink_ofd->cb = gsmtap_sink_fd_cb; + + osmo_fd_register(sink_ofd); } - gsmtap_sink_bfd.when = BSC_FD_READ; - gsmtap_sink_bfd.cb = gsmtap_sink_fd_cb; - gsmtap_sink_bfd.data = NULL; + return fd; +} - return osmo_fd_register(&gsmtap_sink_bfd); +/* like gsmtap_init2() but integrated with libosmocore select.c */ +struct gsmtap_inst *gsmtap_source_init(const char *host, uint16_t port, + int ofd_wq_mode) +{ + struct gsmtap_inst *gti; + int fd; + + fd = gsmtap_source_init_fd(host, port); + if (fd < 0) + return NULL; + + gti = talloc_zero(NULL, struct gsmtap_inst); + gti->ofd_wq_mode = ofd_wq_mode; + gti->wq.bfd.fd = fd; + gti->sink_ofd.fd = -1; + + if (ofd_wq_mode) { + osmo_wqueue_init(>i->wq, 64); + gti->wq.write_cb = &gsmtap_wq_w_cb; + + osmo_fd_register(>i->wq.bfd); + } + return gti; } #endif /* HAVE_SYS_SELECT_H */ |