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libosmocore/src/gb/gprs_ns_sns.c

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/* Implementation of 3GPP TS 48.016 NS IP Sub-Network Service */
/* (C) 2018 by Harald Welte <laforge@gnumonks.org> */
/* The BSS NSE only has one SGSN IP address configured, and it will use the SNS procedures
* to communicated its local IPs/ports as well as all the SGSN side IPs/ports and
* associated weights. In theory, the BSS then uses this to establish a full mesh
* of NSVCs between all BSS-side IPs/ports and SGSN-side IPs/ports */
#include <errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <osmocom/core/fsm.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/signal.h>
#include <osmocom/core/socket.h>
#include <osmocom/gsm/tlv.h>
#include <osmocom/gprs/gprs_msgb.h>
#include <osmocom/gprs/gprs_ns.h>
#include "common_vty.h"
#include "gb_internal.h"
#define S(x) (1 << (x))
struct gprs_sns_state {
struct gprs_ns_inst *nsi;
struct gprs_nsvc *nsvc_hack;
/* local configuration to send to the remote end */
struct gprs_ns_ie_ip4_elem *ip4_local;
size_t num_ip4_local;
/* local configuration about our capabilities in terms of connections to
* remote (SGSN) side */
size_t num_max_nsvcs;
size_t num_max_ip4_remote;
/* remote configuration as received */
struct gprs_ns_ie_ip4_elem *ip4_remote;
unsigned int num_ip4_remote;
/* IP-SNS based Gb doesn't have a NSVCI. However, our existing Gb stack
* requires a unique NSVCI per NS-VC. Let's simply allocate them dynamically from
* the maximum (65533), counting downwards */
uint16_t next_nsvci;
};
static inline struct gprs_ns_inst *ns_inst_from_fi(struct osmo_fsm_inst *fi)
{
struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv;
return gss->nsi;
}
/* helper function to compute the sum of all (data or signaling) weights */
static int ip4_weight_sum(const struct gprs_ns_ie_ip4_elem *ip4, unsigned int num,
bool data_weight)
{
unsigned int i;
int weight_sum = 0;
for (i = 0; i < num; i++) {
if (data_weight)
weight_sum += ip4[i].data_weight;
else
weight_sum += ip4[i].sig_weight;
}
return weight_sum;
}
#define ip4_weight_sum_data(x,y) ip4_weight_sum(x, y, true)
#define ip4_weight_sum_sig(x,y) ip4_weight_sum(x, y, false)
static struct gprs_nsvc *nsvc_by_ip4_elem(struct gprs_ns_inst *nsi,
const struct gprs_ns_ie_ip4_elem *ip4)
{
struct sockaddr_in sin;
/* copy over. Both data structures use network byte order */
sin.sin_addr.s_addr = ip4->ip_addr;
sin.sin_port = ip4->udp_port;
return gprs_nsvc_by_rem_addr(nsi, &sin);
}
static struct gprs_nsvc *gprs_nsvc_create_ip4(struct gprs_ns_inst *nsi,
const struct gprs_ns_ie_ip4_elem *ip4)
{
struct gprs_sns_state *gss = (struct gprs_sns_state *) nsi->bss_sns_fi->priv;
struct gprs_nsvc *nsvc;
struct sockaddr_in sin;
/* copy over. Both data structures use network byte order */
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = ip4->ip_addr;
sin.sin_port = ip4->udp_port;
nsvc = gprs_nsvc_create2(nsi, gss->next_nsvci--, ip4->sig_weight, ip4->data_weight);
if (!nsvc)
return NULL;
/* NSEI is the same across all NS-VCs */
nsvc->nsei = gss->nsvc_hack->nsei;
nsvc->nsvci_is_valid = 0;
nsvc->ip.bts_addr = sin;
return nsvc;
}
static int create_missing_nsvcs(struct osmo_fsm_inst *fi)
{
struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv;
struct gprs_ns_inst *nsi = ns_inst_from_fi(fi);
unsigned int i;
for (i = 0; i < gss->num_ip4_remote; i++) {
const struct gprs_ns_ie_ip4_elem *ip4 = &gss->ip4_remote[i];
struct gprs_nsvc *nsvc = nsvc_by_ip4_elem(nsi, ip4);
if (!nsvc) {
/* create, if it doesn't exist */
nsvc = gprs_nsvc_create_ip4(nsi, ip4);
if (!nsvc) {
LOGPFSML(fi, LOGL_ERROR, "SNS-CONFIG: Failed to create NSVC\n");
continue;
}
} else {
/* update data / signalling weight */
nsvc->data_weight = ip4->data_weight;
nsvc->sig_weight = ip4->sig_weight;
}
LOGPFSML(fi, LOGL_INFO, "NS-VC %s data_weight=%u, sig_weight=%u\n",
gprs_ns_ll_str(nsvc), nsvc->data_weight, nsvc->sig_weight);
}
return 0;
}
/* Add a given remote IPv4 element to gprs_sns_state */
static int add_remote_ip4_elem(struct gprs_sns_state *gss, const struct gprs_ns_ie_ip4_elem *ip4)
{
if (gss->num_ip4_remote >= gss->num_max_ip4_remote)
return -E2BIG;
gss->ip4_remote = talloc_realloc(gss, gss->ip4_remote, struct gprs_ns_ie_ip4_elem,
gss->num_ip4_remote+1);
gss->ip4_remote[gss->num_ip4_remote] = *ip4;
gss->num_ip4_remote += 1;
return 0;
}
/* Remove a given remote IPv4 element from gprs_sns_state */
static int remove_remote_ip4_elem(struct gprs_sns_state *gss, const struct gprs_ns_ie_ip4_elem *ip4)
{
unsigned int i;
for (i = 0; i < gss->num_ip4_remote; i++) {
if (memcmp(&gss->ip4_remote[i], ip4, sizeof(*ip4)))
continue;
/* all array elements < i remain as they are; all > i are shifted left by one */
memmove(&gss->ip4_remote[i], &gss->ip4_remote[i+1], gss->num_ip4_remote-i-1);
gss->num_ip4_remote -= 1;
return 0;
}
return -1;
}
/* update the weights for specified remote IPv4 */
static int update_remote_ip4_elem(struct gprs_sns_state *gss, const struct gprs_ns_ie_ip4_elem *ip4)
{
unsigned int i;
for (i = 0; i < gss->num_ip4_remote; i++) {
if (gss->ip4_remote[i].ip_addr != ip4->ip_addr ||
gss->ip4_remote[i].udp_port != ip4->udp_port)
continue;
gss->ip4_remote[i].sig_weight = ip4->sig_weight;
gss->ip4_remote[i].data_weight = ip4->data_weight;
return 0;
}
return -1;
}
static int do_sns_change_weight(struct osmo_fsm_inst *fi, const struct gprs_ns_ie_ip4_elem *ip4)
{
struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv;
struct gprs_ns_inst *nsi = ns_inst_from_fi(fi);
struct gprs_nsvc *nsvc = nsvc_by_ip4_elem(nsi, ip4);
/* TODO: Upon receiving an SNS-CHANGEWEIGHT PDU, if the resulting sum of the
* signalling weights of all the peer IP endpoints configured for this NSE is
* equal to zero or if the resulting sum of the data weights of all the peer IP
* endpoints configured for this NSE is equal to zero, the BSS/SGSN shall send an
* SNS-ACK PDU with a cause code of "Invalid weights". */
update_remote_ip4_elem(gss, ip4);
if (!nsvc) {
LOGPFSML(fi, LOGL_NOTICE, "Couldn't find NS-VC for SNS-CHANGE_WEIGHT\n");
return -NS_CAUSE_NSVC_UNKNOWN;
}
LOGPFSML(fi, LOGL_INFO, "CHANGE-WEIGHT NS-VC %s data_weight %u->%u, sig_weight %u->%u\n",
gprs_ns_ll_str(nsvc), nsvc->data_weight, ip4->data_weight,
nsvc->sig_weight, ip4->sig_weight);
nsvc->data_weight = ip4->data_weight;
nsvc->sig_weight = ip4->sig_weight;
return 0;
}
static int do_sns_delete(struct osmo_fsm_inst *fi, const struct gprs_ns_ie_ip4_elem *ip4)
{
struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv;
struct gprs_ns_inst *nsi = ns_inst_from_fi(fi);
struct gprs_nsvc *nsvc = nsvc_by_ip4_elem(nsi, ip4);
if (remove_remote_ip4_elem(gss, ip4) < 0)
return -NS_CAUSE_UNKN_IP_EP;
if (!nsvc) {
LOGPFSML(fi, LOGL_NOTICE, "Couldn't find NS-VC for SNS-DELETE\n");
return -NS_CAUSE_NSVC_UNKNOWN;
}
LOGPFSML(fi, LOGL_INFO, "DELETE NS-VC %s\n", gprs_ns_ll_str(nsvc));
gprs_nsvc_delete(nsvc);
return 0;
}
static int do_sns_add(struct osmo_fsm_inst *fi, const struct gprs_ns_ie_ip4_elem *ip4)
{
struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv;
struct gprs_ns_inst *nsi = ns_inst_from_fi(fi);
struct gprs_nsvc *nsvc;
/* Upon receiving an SNS-ADD PDU, if the consequent number of IPv4 endpoints
* exceeds the number of IPv4 endpoints supported by the NSE, the NSE shall send
* an SNS-ACK PDU with a cause code set to "Invalid number of IP4 Endpoints". */
if (add_remote_ip4_elem(gss, ip4) < 0)
return -NS_CAUSE_INVAL_NR_NS_VC;
/* Upon receiving an SNS-ADD PDU containing an already configured IP endpoint the
* NSE shall send an SNS-ACK PDU with the cause code "Protocol error -
* unspecified" */
nsvc = nsvc_by_ip4_elem(nsi, ip4);
if (nsvc)
return -NS_CAUSE_PROTO_ERR_UNSPEC;
nsvc = gprs_nsvc_create_ip4(nsi, ip4);
if (!nsvc) {
LOGPFSML(fi, LOGL_ERROR, "SNS-ADD: Failed to create NSVC\n");
remove_remote_ip4_elem(gss, ip4);
return -NS_CAUSE_EQUIP_FAIL;
}
LOGPFSML(fi, LOGL_INFO, "ADD NS-VC %s data_weight=%u, sig_weight=%u\n",
gprs_ns_ll_str(nsvc), nsvc->data_weight, nsvc->sig_weight);
/* Start the test procedure for this new NS-VC */
gprs_nsvc_start_test(nsvc);
return 0;
}
/***********************************************************************
* BSS-side FSM for IP Sub-Network Service
***********************************************************************/
enum gprs_sns_bss_state {
GPRS_SNS_ST_UNCONFIGURED,
GPRS_SNS_ST_SIZE, /*!< SNS-SIZE procedure ongoing */
GPRS_SNS_ST_CONFIG_BSS, /*!< SNS-CONFIG procedure (BSS->SGSN) ongoing */
GPRS_SNS_ST_CONFIG_SGSN, /*!< SNS-CONFIG procedure (SGSN->BSS) ongoing */
GPRS_SNS_ST_CONFIGURED,
};
enum gprs_sns_event {
GPRS_SNS_EV_START,
GPRS_SNS_EV_SIZE,
GPRS_SNS_EV_SIZE_ACK,
GPRS_SNS_EV_CONFIG,
GPRS_SNS_EV_CONFIG_END, /*!< SNS-CONFIG with end flag received */
GPRS_SNS_EV_CONFIG_ACK,
GPRS_SNS_EV_ADD,
GPRS_SNS_EV_DELETE,
GPRS_SNS_EV_CHANGE_WEIGHT,
};
static const struct value_string gprs_sns_event_names[] = {
{ GPRS_SNS_EV_START, "START" },
{ GPRS_SNS_EV_SIZE, "SIZE" },
{ GPRS_SNS_EV_SIZE_ACK, "SIZE_ACK" },
{ GPRS_SNS_EV_CONFIG, "CONFIG" },
{ GPRS_SNS_EV_CONFIG_END, "CONFIG_END" },
{ GPRS_SNS_EV_CONFIG_ACK, "CONFIG_ACK" },
{ GPRS_SNS_EV_ADD, "ADD" },
{ GPRS_SNS_EV_DELETE, "DELETE" },
{ GPRS_SNS_EV_CHANGE_WEIGHT, "CHANGE_WEIGHT" },
{ 0, NULL }
};
static void gprs_sns_st_unconfigured(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
struct gprs_ns_inst *nsi = ns_inst_from_fi(fi);
switch (event) {
case GPRS_SNS_EV_START:
osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SIZE, nsi->timeout[NS_TOUT_TSNS_PROV], 1);
break;
default:
OSMO_ASSERT(0);
}
}
static void gprs_sns_st_size(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
struct gprs_ns_inst *nsi = ns_inst_from_fi(fi);
struct tlv_parsed *tp = NULL;
switch (event) {
case GPRS_SNS_EV_SIZE_ACK:
tp = data;
if (TLVP_VAL_MINLEN(tp, NS_IE_CAUSE, 1)) {
LOGPFSML(fi, LOGL_ERROR, "SNS-SIZE-ACK with cause %s\n",
gprs_ns_cause_str(*TLVP_VAL(tp, NS_IE_CAUSE)));
/* FIXME: What to do? */
} else {
osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIG_BSS,
nsi->timeout[NS_TOUT_TSNS_PROV], 2);
}
break;
default:
OSMO_ASSERT(0);
}
}
static void gprs_sns_st_size_onenter(struct osmo_fsm_inst *fi, uint32_t old_state)
{
struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv;
uint16_t num_max_ip4_remote = gss->num_max_ip4_remote;
gprs_ns_tx_sns_size(gss->nsvc_hack, true, gss->num_max_nsvcs, &num_max_ip4_remote, NULL);
}
static void gprs_sns_st_config_bss(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
//struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv;
//struct gprs_ns_inst *nsi = ns_inst_from_fi(fi);
struct tlv_parsed *tp = NULL;
switch (event) {
case GPRS_SNS_EV_CONFIG_ACK:
tp = data;
if (TLVP_VAL_MINLEN(tp, NS_IE_CAUSE, 1)) {
LOGPFSML(fi, LOGL_ERROR, "SNS-CONFIG-ACK with cause %s\n",
gprs_ns_cause_str(*TLVP_VAL(tp, NS_IE_CAUSE)));
/* FIXME: What to do? */
} else {
osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIG_SGSN, 0, 0);
}
break;
default:
OSMO_ASSERT(0);
}
}
static void gprs_sns_st_config_bss_onenter(struct osmo_fsm_inst *fi, uint32_t old_state)
{
struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv;
/* Transmit SNS-CONFIG */
gprs_ns_tx_sns_config(gss->nsvc_hack, true, gss->ip4_local, gss->num_ip4_local);
}
static void gprs_sns_st_config_sgsn(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv;
struct tlv_parsed *tp = NULL;
struct gprs_ns_inst *nsi = ns_inst_from_fi(fi);
const struct gprs_ns_ie_ip4_elem *v4_list;
unsigned int num_v4;
uint8_t cause;
switch (event) {
case GPRS_SNS_EV_CONFIG_END:
case GPRS_SNS_EV_CONFIG:
tp = data;
#if 0 /* part of incoming SNS-SIZE (doesn't happen on BSS side */
if (TLVP_PRESENT(tp, NS_IE_RESET_FLAG)) {
/* reset all existing config */
if (gss->ip4_remote)
talloc_free(gss->ip4_remote);
gss->num_ip4_remote = 0;
}
#endif
if (!TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) {
cause = NS_CAUSE_INVAL_NR_IPv4_EP;
gprs_ns_tx_sns_config_ack(gss->nsvc_hack, &cause);
osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0);
break;
}
v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST);
num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(*v4_list);
/* realloc to the new size */
gss->ip4_remote = talloc_realloc(gss, gss->ip4_remote,
struct gprs_ns_ie_ip4_elem,
gss->num_ip4_remote+num_v4);
/* append the new entries to the end of the list */
memcpy(&gss->ip4_remote[gss->num_ip4_remote], v4_list, num_v4*sizeof(*v4_list));
gss->num_ip4_remote += num_v4;
LOGPFSML(fi, LOGL_INFO, "Rx SNS-CONFIG: Remote IPv4 list now %u entries\n",
gss->num_ip4_remote);
if (event == GPRS_SNS_EV_CONFIG_END) {
/* check if sum of data / sig weights == 0 */
if (ip4_weight_sum_data(gss->ip4_remote, gss->num_ip4_remote) == 0 ||
ip4_weight_sum_sig(gss->ip4_remote, gss->num_ip4_remote) == 0) {
cause = NS_CAUSE_INVAL_WEIGH;
gprs_ns_tx_sns_config_ack(gss->nsvc_hack, &cause);
osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0);
break;
}
create_missing_nsvcs(fi);
gprs_ns_tx_sns_config_ack(gss->nsvc_hack, NULL);
/* start the test procedure on ALL NSVCs! */
gprs_start_alive_all_nsvcs(nsi);
osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIGURED, 0, 0);
} else {
/* just send CONFIG-ACK */
gprs_ns_tx_sns_config_ack(gss->nsvc_hack, NULL);
}
break;
default:
OSMO_ASSERT(0);
}
}
static void gprs_sns_st_configured(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv;
struct tlv_parsed *tp = NULL;
const struct gprs_ns_ie_ip4_elem *v4_list = NULL;
unsigned int num_v4 = 0;
uint8_t trans_id;
uint8_t cause = 0xff;
unsigned int i;
int rc;
switch (event) {
case GPRS_SNS_EV_ADD:
tp = data;
trans_id = *TLVP_VAL(tp, NS_IE_TRANS_ID);
if (TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) {
v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST);
num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(*v4_list);
for (i = 0; i < num_v4; i++) {
rc = do_sns_add(fi, &v4_list[i]);
if (rc < 0) {
unsigned int j;
/* rollback/undo to restore previous state */
for (j = 0; j < i; j++)
do_sns_delete(fi, &v4_list[j]);
cause = -rc;
gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0);
break;
}
}
} else {
cause = NS_CAUSE_INVAL_NR_IPv4_EP;
gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0);
break;
}
gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, NULL, v4_list, num_v4);
break;
case GPRS_SNS_EV_DELETE:
tp = data;
trans_id = *TLVP_VAL(tp, NS_IE_TRANS_ID);
if (TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) {
v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST);
num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(*v4_list);
for (i = 0; i < num_v4; i++) {
rc = do_sns_delete(fi, &v4_list[i]);
if (rc < 0) {
cause = -rc;
/* continue to delete others */
}
}
if (cause != 0xff) {
/* TODO: create list of not-deleted and return it */
gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0);
break;
}
} else if (TLVP_PRES_LEN(tp, NS_IE_IP_ADDR, 5)) {
/* delete all NS-VCs for given IP address */
const uint8_t *ie = TLVP_VAL(tp, NS_IE_IP_ADDR);
struct gprs_ns_ie_ip4_elem *ip4_remote;
uint32_t ip_addr = *(uint32_t *)(ie+1);
if (ie[0] != 0x01) { /* Address Type != IPv4 */
cause = NS_CAUSE_UNKN_IP_ADDR;
gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0);
break;
}
/* make a copy as do_sns_delete() will change the array underneath us */
ip4_remote = talloc_memdup(fi, gss->ip4_remote,
gss->num_ip4_remote*sizeof(*v4_list));
for (i = 0; i < gss->num_ip4_remote; i++) {
if (ip4_remote[i].ip_addr == ip_addr) {
rc = do_sns_delete(fi, &ip4_remote[i]);
if (rc < 0) {
cause = -rc;
/* continue to delete others */
}
}
}
talloc_free(ip4_remote);
if (cause != 0xff) {
/* TODO: create list of not-deleted and return it */
gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0);
break;
}
} else {
cause = NS_CAUSE_INVAL_NR_IPv4_EP;
gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0);
break;
}
gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, NULL, v4_list, num_v4);
break;
case GPRS_SNS_EV_CHANGE_WEIGHT:
tp = data;
trans_id = *TLVP_VAL(tp, NS_IE_TRANS_ID);
if (TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) {
v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST);
num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(*v4_list);
for (i = 0; i < num_v4; i++) {
rc = do_sns_change_weight(fi, &v4_list[i]);
if (rc < 0) {
cause = -rc;
/* continue to others */
}
}
if (cause != 0xff) {
gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0);
break;
}
} else {
cause = NS_CAUSE_INVAL_NR_IPv4_EP;
gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0);
break;
}
gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, NULL, v4_list, num_v4);
break;
}
}
static void gprs_sns_st_configured_onenter(struct osmo_fsm_inst *fi, uint32_t old_state)
{
struct ns_signal_data nssd = {0};
osmo_signal_dispatch(SS_L_NS, S_SNS_CONFIGURED, &nssd);
}
static const struct osmo_fsm_state gprs_sns_bss_states[] = {
[GPRS_SNS_ST_UNCONFIGURED] = {
.in_event_mask = S(GPRS_SNS_EV_START),
.out_state_mask = S(GPRS_SNS_ST_SIZE),
.name = "UNCONFIGURED",
.action = gprs_sns_st_unconfigured,
},
[GPRS_SNS_ST_SIZE] = {
.in_event_mask = S(GPRS_SNS_EV_SIZE_ACK),
.out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) |
S(GPRS_SNS_ST_SIZE) |
S(GPRS_SNS_ST_CONFIG_BSS),
.name = "SIZE",
.action = gprs_sns_st_size,
.onenter = gprs_sns_st_size_onenter,
},
[GPRS_SNS_ST_CONFIG_BSS] = {
.in_event_mask = S(GPRS_SNS_EV_CONFIG_ACK),
.out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) |
S(GPRS_SNS_ST_CONFIG_BSS) |
S(GPRS_SNS_ST_CONFIG_SGSN),
.name = "CONFIG_BSS",
.action = gprs_sns_st_config_bss,
.onenter = gprs_sns_st_config_bss_onenter,
},
[GPRS_SNS_ST_CONFIG_SGSN] = {
.in_event_mask = S(GPRS_SNS_EV_CONFIG) |
S(GPRS_SNS_EV_CONFIG_END),
.out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) |
S(GPRS_SNS_ST_CONFIG_SGSN) |
S(GPRS_SNS_ST_CONFIGURED),
.name = "CONFIG_SGSN",
.action = gprs_sns_st_config_sgsn,
},
[GPRS_SNS_ST_CONFIGURED] = {
.in_event_mask = S(GPRS_SNS_EV_ADD) |
S(GPRS_SNS_EV_DELETE) |
S(GPRS_SNS_EV_CHANGE_WEIGHT),
.out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED),
.name = "CONFIGURED",
.action = gprs_sns_st_configured,
.onenter = gprs_sns_st_configured_onenter,
},
};
static int gprs_sns_fsm_bss_timer_cb(struct osmo_fsm_inst *fi)
{
struct gprs_ns_inst *nsi = ns_inst_from_fi(fi);
switch (fi->T) {
case 1:
osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SIZE, nsi->timeout[NS_TOUT_TSNS_PROV], 1);
break;
case 2:
osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIG_BSS, nsi->timeout[NS_TOUT_TSNS_PROV], 2);
break;
}
return 0;
}
static struct osmo_fsm gprs_sns_bss_fsm = {
.name = "GPRS-SNS-BSS",
.states = gprs_sns_bss_states,
.num_states = ARRAY_SIZE(gprs_sns_bss_states),
.allstate_event_mask = 0,
.allstate_action = NULL,
.cleanup = NULL,
.timer_cb = gprs_sns_fsm_bss_timer_cb,
/* .log_subsys = DNS, "is not constant" */
.event_names = gprs_sns_event_names,
.pre_term = NULL,
};
struct osmo_fsm_inst *gprs_sns_bss_fsm_alloc(void *ctx, struct gprs_nsvc *nsvc,
const char *id)
{
struct osmo_fsm_inst *fi;
struct gprs_sns_state *gss;
struct gprs_ns_ie_ip4_elem *ip4;
struct gprs_ns_inst *nsi = nsvc->nsi;
fi = osmo_fsm_inst_alloc(&gprs_sns_bss_fsm, ctx, NULL, LOGL_DEBUG, id);
if (!fi)
return fi;
gss = talloc_zero(fi, struct gprs_sns_state);
if (!gss)
goto err;
fi->priv = gss;
gss->nsi = nsi;
/* FIXME: we shouldn't use 'nsvc' here but only gprs_ns_inst */
gss->nsvc_hack = nsvc;
gss->next_nsvci = 65533; /* 65534 + 65535 are already used internally */
/* create IPv4 list from the one IP/port the NS instance has */
ip4 = talloc_zero(gss, struct gprs_ns_ie_ip4_elem);
if (!ip4)
goto err;
if (nsi->nsip.local_ip)
ip4->ip_addr = htonl(nsi->nsip.local_ip);
else {
/* unspecified local address. Figure out which address the kernel would use if we
* wanted to send a packet to the remote_ip */
char local_ip[32];
struct sockaddr_in *daddr = &nsvc->ip.bts_addr;
osmo_sock_local_ip(local_ip, inet_ntoa(daddr->sin_addr));
ip4->ip_addr = inet_addr(local_ip);
}
ip4->udp_port = htons(gss->nsi->nsip.local_port);
ip4->sig_weight = 2;
ip4->data_weight = 1;
gss->ip4_local = ip4;
gss->num_ip4_local = 1;
gss->num_max_nsvcs = 8;
gss->num_max_ip4_remote = 4;
return fi;
err:
osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL);
return NULL;
}
int gprs_sns_bss_fsm_start(struct gprs_ns_inst *nsi)
{
return osmo_fsm_inst_dispatch(nsi->bss_sns_fi, GPRS_SNS_EV_START, NULL);
}
/* main entry point for receiving SNS messages from the network */
int gprs_ns_rx_sns(struct gprs_ns_inst *nsi, struct msgb *msg, struct tlv_parsed *tp)
{
struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h;
uint16_t nsei = msgb_nsei(msg);
struct osmo_fsm_inst *fi;
LOGP(DNS, LOGL_DEBUG, "NSEI=%u Rx SNS PDU type %s\n", nsei,
get_value_string(gprs_ns_pdu_strings, nsh->pdu_type));
/* FIXME: how to resolve SNS FSM Instance by NSEI (SGSN)? */
fi = nsi->bss_sns_fi;
switch (nsh->pdu_type) {
case SNS_PDUT_SIZE:
osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_SIZE, tp);
break;
case SNS_PDUT_SIZE_ACK:
osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_SIZE_ACK, tp);
break;
case SNS_PDUT_CONFIG:
if (nsh->data[0] & 0x01)
osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CONFIG_END, tp);
else
osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CONFIG, tp);
break;
case SNS_PDUT_CONFIG_ACK:
osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CONFIG_ACK, tp);
break;
case SNS_PDUT_ADD:
osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_ADD, tp);
break;
case SNS_PDUT_DELETE:
osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_DELETE, tp);
break;
case SNS_PDUT_CHANGE_WEIGHT:
osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CHANGE_WEIGHT, tp);
break;
case SNS_PDUT_ACK:
LOGP(DNS, LOGL_NOTICE, "NSEI=%u Rx unsupported SNS PDU type %s\n", nsei,
get_value_string(gprs_ns_pdu_strings, nsh->pdu_type));
break;
default:
LOGP(DNS, LOGL_ERROR, "NSEI=%u Rx unknown SNS PDU type %s\n", nsei,
get_value_string(gprs_ns_pdu_strings, nsh->pdu_type));
return -EINVAL;
}
return 0;
}
int gprs_sns_init(void)
{
/* "DNS" is not a constant/#define, but an integer variable set by the client app */
gprs_sns_bss_fsm.log_subsys = DNS;
return osmo_fsm_register(&gprs_sns_bss_fsm);
}
#include <osmocom/vty/vty.h>
#include <osmocom/vty/misc.h>
static void vty_dump_sns_ip4(struct vty *vty, const struct gprs_ns_ie_ip4_elem *ip4)
{
struct in_addr in = { .s_addr = ip4->ip_addr };
vty_out(vty, " %s:%u, Signalling Weight: %u, Data Weight: %u%s",
inet_ntoa(in), ntohs(ip4->udp_port), ip4->sig_weight, ip4->data_weight, VTY_NEWLINE);
}
void gprs_sns_dump_vty(struct vty *vty, const struct gprs_ns_inst *nsi, bool stats)
{
struct gprs_sns_state *gss;
unsigned int i;
if (!nsi->bss_sns_fi)
return;
vty_out_fsm_inst(vty, nsi->bss_sns_fi);
gss = (struct gprs_sns_state *) nsi->bss_sns_fi->priv;
vty_out(vty, "Maximum number of remote NS-VCs: %zu, IPv4 Endpoints: %zu%s",
gss->num_max_nsvcs, gss->num_max_ip4_remote, VTY_NEWLINE);
vty_out(vty, "Local IPv4 Endpoints:%s", VTY_NEWLINE);
for (i = 0; i < gss->num_ip4_local; i++)
vty_dump_sns_ip4(vty, &gss->ip4_local[i]);
vty_out(vty, "Remote IPv4 Endpoints:%s", VTY_NEWLINE);
for (i = 0; i < gss->num_ip4_remote; i++)
vty_dump_sns_ip4(vty, &gss->ip4_remote[i]);
}
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