| /*! \file gprs_ns2_sns.c |
| * NS Sub-Network Service Protocol implementation |
| * 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05) |
| * as well as its successor 3GPP TS 48.016 */ |
| |
| /* (C) 2018-2021 by Harald Welte <laforge@gnumonks.org> |
| * (C) 2020 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> |
| * Author: Alexander Couzens <lynxis@fe80.eu> |
| * |
| * All Rights Reserved |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| /* 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. The BSS then uses this to establish a full mesh |
| * of NSVCs between all BSS-side IPs/ports and SGSN-side IPs/ports. |
| * |
| * Known limitation/expectation/bugs: |
| * - No concurrent dual stack. It supports either IPv4 or IPv6, but not both at the same time. |
| * - SNS Add/Change/Delete: Doesn't answer on the same NSVC as received SNS ADD/CHANGE/DELETE PDUs. |
| * - SNS Add/Change/Delete: Doesn't communicated the failed IPv4/IPv6 entries on the SNS_ACK. |
| */ |
| |
| #include <errno.h> |
| |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <stdint.h> |
| |
| #include <osmocom/core/fsm.h> |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/socket.h> |
| #include <osmocom/core/sockaddr_str.h> |
| #include <osmocom/gsm/tlv.h> |
| #include <osmocom/gprs/gprs_msgb.h> |
| #include <osmocom/gprs/gprs_ns2.h> |
| #include <osmocom/gprs/protocol/gsm_08_16.h> |
| |
| #include "gprs_ns2_internal.h" |
| |
| #define S(x) (1 << (x)) |
| |
| enum ns2_sns_type { |
| IPv4, |
| IPv6, |
| }; |
| |
| enum ns2_sns_role { |
| GPRS_SNS_ROLE_BSS, |
| GPRS_SNS_ROLE_SGSN, |
| }; |
| |
| /* BSS-side-only states _ST_BSS_; SGSN-side only states _ST_SGSN_; others shared */ |
| enum gprs_sns_bss_state { |
| GPRS_SNS_ST_UNCONFIGURED, |
| GPRS_SNS_ST_BSS_SIZE, /*!< SNS-SIZE procedure ongoing */ |
| GPRS_SNS_ST_BSS_CONFIG_BSS, /*!< SNS-CONFIG procedure (BSS->SGSN) ongoing */ |
| GPRS_SNS_ST_BSS_CONFIG_SGSN, /*!< SNS-CONFIG procedure (SGSN->BSS) ongoing */ |
| GPRS_SNS_ST_CONFIGURED, |
| GPRS_SNS_ST_SGSN_WAIT_CONFIG, /* !< SGSN role: Wait for CONFIG from BSS */ |
| GPRS_SNS_ST_SGSN_WAIT_CONFIG_ACK, /* !< SGSN role: Wait for CONFIG-ACK from BSS */ |
| }; |
| |
| enum gprs_sns_event { |
| GPRS_SNS_EV_REQ_SELECT_ENDPOINT, /*!< Select a SNS endpoint from the list */ |
| GPRS_SNS_EV_RX_SIZE, |
| GPRS_SNS_EV_RX_SIZE_ACK, |
| GPRS_SNS_EV_RX_CONFIG, |
| GPRS_SNS_EV_RX_CONFIG_END, /*!< SNS-CONFIG with end flag received */ |
| GPRS_SNS_EV_RX_CONFIG_ACK, |
| GPRS_SNS_EV_RX_ADD, |
| GPRS_SNS_EV_RX_DELETE, |
| GPRS_SNS_EV_RX_CHANGE_WEIGHT, |
| GPRS_SNS_EV_RX_ACK, /*!< Rx of SNS-ACK (response to ADD/DELETE/CHG_WEIGHT */ |
| GPRS_SNS_EV_REQ_NO_NSVC, /*!< no more NS-VC remaining (all dead) */ |
| GPRS_SNS_EV_REQ_NSVC_ALIVE, /*!< a NS-VC became alive */ |
| GPRS_SNS_EV_REQ_ADD_BIND, /*!< add a new local bind to this NSE */ |
| GPRS_SNS_EV_REQ_DELETE_BIND, /*!< remove a local bind from this NSE */ |
| }; |
| |
| static const struct value_string gprs_sns_event_names[] = { |
| { GPRS_SNS_EV_REQ_SELECT_ENDPOINT, "REQ_SELECT_ENDPOINT" }, |
| { GPRS_SNS_EV_RX_SIZE, "RX_SIZE" }, |
| { GPRS_SNS_EV_RX_SIZE_ACK, "RX_SIZE_ACK" }, |
| { GPRS_SNS_EV_RX_CONFIG, "RX_CONFIG" }, |
| { GPRS_SNS_EV_RX_CONFIG_END, "RX_CONFIG_END" }, |
| { GPRS_SNS_EV_RX_CONFIG_ACK, "RX_CONFIG_ACK" }, |
| { GPRS_SNS_EV_RX_ADD, "RX_ADD" }, |
| { GPRS_SNS_EV_RX_DELETE, "RX_DELETE" }, |
| { GPRS_SNS_EV_RX_ACK, "RX_ACK" }, |
| { GPRS_SNS_EV_RX_CHANGE_WEIGHT, "RX_CHANGE_WEIGHT" }, |
| { GPRS_SNS_EV_REQ_NO_NSVC, "REQ_NO_NSVC" }, |
| { GPRS_SNS_EV_REQ_NSVC_ALIVE, "REQ_NSVC_ALIVE"}, |
| { GPRS_SNS_EV_REQ_ADD_BIND, "REQ_ADD_BIND"}, |
| { GPRS_SNS_EV_REQ_DELETE_BIND, "REQ_DELETE_BIND"}, |
| { 0, NULL } |
| }; |
| |
| struct sns_endpoint { |
| struct llist_head list; |
| struct osmo_sockaddr saddr; |
| }; |
| |
| struct ns2_sns_bind { |
| struct llist_head list; |
| struct gprs_ns2_vc_bind *bind; |
| }; |
| |
| struct ns2_sns_state { |
| struct gprs_ns2_nse *nse; |
| |
| enum ns2_sns_type ip; |
| enum ns2_sns_role role; /* local role: BSS or SGSN */ |
| |
| /* holds the list of initial SNS endpoints */ |
| struct llist_head sns_endpoints; |
| /* list of used struct ns2_sns_bind */ |
| struct llist_head binds; |
| /* pointer to the bind which was used to initiate the SNS connection */ |
| struct ns2_sns_bind *initial_bind; |
| /* prevent recursive reselection */ |
| bool reselection_running; |
| |
| /* The current initial SNS endpoints. |
| * The initial connection will be moved into the NSE |
| * if configured via SNS. Otherwise it will be removed |
| * in configured state. */ |
| struct sns_endpoint *initial; |
| /* all SNS PDU will be sent over this nsvc */ |
| struct gprs_ns2_vc *sns_nsvc; |
| /* timer N */ |
| int N; |
| /* true if at least one nsvc is alive */ |
| bool alive; |
| |
| /* local configuration to send to the remote end */ |
| struct gprs_ns_ie_ip4_elem *ip4_local; |
| size_t num_ip4_local; |
| |
| /* local configuration to send to the remote end */ |
| struct gprs_ns_ie_ip6_elem *ip6_local; |
| size_t num_ip6_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; |
| size_t num_max_ip6_remote; |
| |
| /* remote configuration as received */ |
| struct gprs_ns_ie_ip4_elem *ip4_remote; |
| unsigned int num_ip4_remote; |
| |
| /* remote configuration as received */ |
| struct gprs_ns_ie_ip6_elem *ip6_remote; |
| unsigned int num_ip6_remote; |
| }; |
| |
| static inline struct gprs_ns2_nse *nse_inst_from_fi(struct osmo_fsm_inst *fi) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| return gss->nse; |
| } |
| |
| /* 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) |
| |
| /* helper function to compute the sum of all (data or signaling) weights */ |
| static int ip6_weight_sum(const struct gprs_ns_ie_ip6_elem *ip6, unsigned int num, |
| bool data_weight) |
| { |
| unsigned int i; |
| int weight_sum = 0; |
| |
| for (i = 0; i < num; i++) { |
| if (data_weight) |
| weight_sum += ip6[i].data_weight; |
| else |
| weight_sum += ip6[i].sig_weight; |
| } |
| return weight_sum; |
| } |
| #define ip6_weight_sum_data(x,y) ip6_weight_sum(x, y, true) |
| #define ip6_weight_sum_sig(x,y) ip6_weight_sum(x, y, false) |
| |
| static int nss_weight_sum(const struct ns2_sns_state *nss, bool data_weight) |
| { |
| return ip4_weight_sum(nss->ip4_remote, nss->num_ip4_remote, data_weight) + |
| ip6_weight_sum(nss->ip6_remote, nss->num_ip6_remote, data_weight); |
| } |
| #define nss_weight_sum_data(nss) nss_weight_sum(nss, true) |
| #define nss_weight_sum_sig(nss) nss_weight_sum(nss, false) |
| |
| static struct gprs_ns2_vc *nsvc_by_ip4_elem(struct gprs_ns2_nse *nse, |
| const struct gprs_ns_ie_ip4_elem *ip4) |
| { |
| struct osmo_sockaddr sa; |
| /* copy over. Both data structures use network byte order */ |
| sa.u.sin.sin_addr.s_addr = ip4->ip_addr; |
| sa.u.sin.sin_port = ip4->udp_port; |
| sa.u.sin.sin_family = AF_INET; |
| |
| return gprs_ns2_nsvc_by_sockaddr_nse(nse, &sa); |
| } |
| |
| static struct gprs_ns2_vc *nsvc_by_ip6_elem(struct gprs_ns2_nse *nse, |
| const struct gprs_ns_ie_ip6_elem *ip6) |
| { |
| struct osmo_sockaddr sa; |
| /* copy over. Both data structures use network byte order */ |
| sa.u.sin6.sin6_addr = ip6->ip_addr; |
| sa.u.sin6.sin6_port = ip6->udp_port; |
| sa.u.sin6.sin6_family = AF_INET; |
| |
| return gprs_ns2_nsvc_by_sockaddr_nse(nse, &sa); |
| } |
| |
| /*! Return the initial SNS remote socket address |
| * \param nse NS Entity |
| * \return address of the initial SNS connection; NULL in case of error |
| */ |
| const struct osmo_sockaddr *gprs_ns2_nse_sns_remote(struct gprs_ns2_nse *nse) |
| { |
| struct ns2_sns_state *gss; |
| |
| if (!nse->bss_sns_fi) |
| return NULL; |
| |
| gss = (struct ns2_sns_state *) nse->bss_sns_fi->priv; |
| return &gss->initial->saddr; |
| } |
| |
| /*! called when a nsvc is beeing freed or the nsvc became dead */ |
| void ns2_sns_replace_nsvc(struct gprs_ns2_vc *nsvc) |
| { |
| struct gprs_ns2_nse *nse = nsvc->nse; |
| struct gprs_ns2_vc *tmp; |
| struct osmo_fsm_inst *fi = nse->bss_sns_fi; |
| struct ns2_sns_state *gss; |
| |
| if (!fi) |
| return; |
| |
| gss = (struct ns2_sns_state *) fi->priv; |
| if (nsvc != gss->sns_nsvc) |
| return; |
| |
| gss->sns_nsvc = NULL; |
| if (gss->alive) { |
| llist_for_each_entry(tmp, &nse->nsvc, list) { |
| if (ns2_vc_is_unblocked(tmp)) { |
| gss->sns_nsvc = tmp; |
| return; |
| } |
| } |
| } else { |
| /* the SNS is waiting for its first NS-VC to come up |
| * choose any other nsvc */ |
| llist_for_each_entry(tmp, &nse->nsvc, list) { |
| if (nsvc != tmp) { |
| gss->sns_nsvc = tmp; |
| return; |
| } |
| } |
| } |
| |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_REQ_NO_NSVC, NULL); |
| } |
| |
| static void ns2_clear_ipv46_entries_local(struct ns2_sns_state *gss) |
| { |
| TALLOC_FREE(gss->ip4_local); |
| TALLOC_FREE(gss->ip6_local); |
| |
| gss->num_ip4_local = 0; |
| gss->num_ip6_local = 0; |
| } |
| |
| static void ns2_clear_ipv46_entries_remote(struct ns2_sns_state *gss) |
| { |
| TALLOC_FREE(gss->ip4_remote); |
| TALLOC_FREE(gss->ip6_remote); |
| |
| gss->num_ip4_remote = 0; |
| gss->num_ip6_remote = 0; |
| } |
| |
| static void ns2_vc_create_ip(struct osmo_fsm_inst *fi, struct gprs_ns2_nse *nse, const struct osmo_sockaddr *remote, |
| uint8_t sig_weight, uint8_t data_weight) |
| { |
| struct gprs_ns2_inst *nsi = nse->nsi; |
| struct gprs_ns2_vc *nsvc; |
| struct gprs_ns2_vc_bind *bind; |
| |
| /* for every bind, create a connection if bind type == IP */ |
| llist_for_each_entry(bind, &nsi->binding, list) { |
| if (bind->ll != GPRS_NS2_LL_UDP) |
| continue; |
| /* ignore failed connection */ |
| nsvc = gprs_ns2_ip_connect_inactive(bind, |
| remote, |
| nse, 0); |
| if (!nsvc) { |
| LOGPFSML(fi, LOGL_ERROR, "SNS-CONFIG: Failed to create NSVC\n"); |
| continue; |
| } |
| |
| nsvc->sig_weight = sig_weight; |
| nsvc->data_weight = data_weight; |
| } |
| } |
| |
| static void ns2_nsvc_create_ip4(struct osmo_fsm_inst *fi, |
| struct gprs_ns2_nse *nse, |
| const struct gprs_ns_ie_ip4_elem *ip4) |
| { |
| struct osmo_sockaddr remote = { }; |
| /* copy over. Both data structures use network byte order */ |
| remote.u.sin.sin_family = AF_INET; |
| remote.u.sin.sin_addr.s_addr = ip4->ip_addr; |
| remote.u.sin.sin_port = ip4->udp_port; |
| |
| ns2_vc_create_ip(fi, nse, &remote, ip4->sig_weight, ip4->data_weight); |
| } |
| |
| static void ns2_nsvc_create_ip6(struct osmo_fsm_inst *fi, |
| struct gprs_ns2_nse *nse, |
| const struct gprs_ns_ie_ip6_elem *ip6) |
| { |
| struct osmo_sockaddr remote = {}; |
| /* copy over. Both data structures use network byte order */ |
| remote.u.sin6.sin6_family = AF_INET6; |
| remote.u.sin6.sin6_addr = ip6->ip_addr; |
| remote.u.sin6.sin6_port = ip6->udp_port; |
| |
| ns2_vc_create_ip(fi, nse, &remote, ip6->sig_weight, ip6->data_weight); |
| } |
| |
| static struct gprs_ns2_vc *nsvc_for_bind_and_remote(struct gprs_ns2_nse *nse, |
| struct gprs_ns2_vc_bind *bind, |
| const struct osmo_sockaddr *remote) |
| { |
| struct gprs_ns2_vc *nsvc; |
| |
| llist_for_each_entry(nsvc, &nse->nsvc, list) { |
| if (nsvc->bind != bind) |
| continue; |
| |
| if (!osmo_sockaddr_cmp(remote, gprs_ns2_ip_vc_remote(nsvc))) |
| return nsvc; |
| } |
| return NULL; |
| } |
| |
| static int create_missing_nsvcs(struct osmo_fsm_inst *fi) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| struct gprs_ns2_vc *nsvc; |
| struct ns2_sns_bind *sbind; |
| struct osmo_sockaddr remote = { }; |
| unsigned int i; |
| |
| /* iterate over all remote IPv4 endpoints */ |
| for (i = 0; i < gss->num_ip4_remote; i++) { |
| const struct gprs_ns_ie_ip4_elem *ip4 = &gss->ip4_remote[i]; |
| |
| remote.u.sin.sin_family = AF_INET; |
| remote.u.sin.sin_addr.s_addr = ip4->ip_addr; |
| remote.u.sin.sin_port = ip4->udp_port; |
| |
| /* iterate over all local binds within this SNS */ |
| llist_for_each_entry(sbind, &gss->binds, list) { |
| struct gprs_ns2_vc_bind *bind = sbind->bind; |
| |
| /* we only care about UDP binds */ |
| if (bind->ll != GPRS_NS2_LL_UDP) |
| continue; |
| |
| nsvc = nsvc_for_bind_and_remote(nse, bind, &remote); |
| if (!nsvc) { |
| nsvc = gprs_ns2_ip_connect_inactive(bind, &remote, nse, 0); |
| if (!nsvc) { |
| /* TODO: add to a list to send back a NS-STATUS */ |
| continue; |
| } |
| } |
| |
| /* update data / signalling weight */ |
| nsvc->data_weight = ip4->data_weight; |
| nsvc->sig_weight = ip4->sig_weight; |
| nsvc->sns_only = false; |
| } |
| } |
| |
| /* iterate over all remote IPv4 endpoints */ |
| for (i = 0; i < gss->num_ip6_remote; i++) { |
| const struct gprs_ns_ie_ip6_elem *ip6 = &gss->ip6_remote[i]; |
| |
| remote.u.sin6.sin6_family = AF_INET6; |
| remote.u.sin6.sin6_addr = ip6->ip_addr; |
| remote.u.sin6.sin6_port = ip6->udp_port; |
| |
| /* iterate over all local binds within this SNS */ |
| llist_for_each_entry(sbind, &gss->binds, list) { |
| struct gprs_ns2_vc_bind *bind = sbind->bind; |
| |
| if (bind->ll != GPRS_NS2_LL_UDP) |
| continue; |
| |
| /* we only care about UDP binds */ |
| nsvc = nsvc_for_bind_and_remote(nse, bind, &remote); |
| if (!nsvc) { |
| nsvc = gprs_ns2_ip_connect_inactive(bind, &remote, nse, 0); |
| if (!nsvc) { |
| /* TODO: add to a list to send back a NS-STATUS */ |
| continue; |
| } |
| } |
| |
| /* update data / signalling weight */ |
| nsvc->data_weight = ip6->data_weight; |
| nsvc->sig_weight = ip6->sig_weight; |
| nsvc->sns_only = false; |
| } |
| } |
| |
| |
| return 0; |
| } |
| |
| /* Add a given remote IPv4 element to gprs_sns_state */ |
| static int add_remote_ip4_elem(struct ns2_sns_state *gss, const struct gprs_ns_ie_ip4_elem *ip4) |
| { |
| unsigned int i; |
| |
| if (gss->num_ip4_remote >= gss->num_max_ip4_remote) |
| return -NS_CAUSE_INVAL_NR_NS_VC; |
| |
| /* check for duplicates */ |
| for (i = 0; i < gss->num_ip4_remote; i++) { |
| if (memcmp(&gss->ip4_remote[i], ip4, sizeof(*ip4))) |
| continue; |
| /* TODO: log message duplicate */ |
| return -NS_CAUSE_PROTO_ERR_UNSPEC; |
| } |
| |
| 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 ns2_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 ns2_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; |
| } |
| |
| /* Add a given remote IPv6 element to gprs_sns_state */ |
| static int add_remote_ip6_elem(struct ns2_sns_state *gss, const struct gprs_ns_ie_ip6_elem *ip6) |
| { |
| if (gss->num_ip6_remote >= gss->num_max_ip6_remote) |
| return -NS_CAUSE_INVAL_NR_NS_VC; |
| |
| gss->ip6_remote = talloc_realloc(gss, gss->ip6_remote, struct gprs_ns_ie_ip6_elem, |
| gss->num_ip6_remote+1); |
| gss->ip6_remote[gss->num_ip6_remote] = *ip6; |
| gss->num_ip6_remote += 1; |
| return 0; |
| } |
| |
| /* Remove a given remote IPv6 element from gprs_sns_state */ |
| static int remove_remote_ip6_elem(struct ns2_sns_state *gss, const struct gprs_ns_ie_ip6_elem *ip6) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < gss->num_ip6_remote; i++) { |
| if (memcmp(&gss->ip6_remote[i], ip6, sizeof(*ip6))) |
| continue; |
| /* all array elements < i remain as they are; all > i are shifted left by one */ |
| memmove(&gss->ip6_remote[i], &gss->ip6_remote[i+1], gss->num_ip6_remote-i-1); |
| gss->num_ip6_remote -= 1; |
| return 0; |
| } |
| return -1; |
| } |
| |
| /* update the weights for specified remote IPv6 */ |
| static int update_remote_ip6_elem(struct ns2_sns_state *gss, const struct gprs_ns_ie_ip6_elem *ip6) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < gss->num_ip6_remote; i++) { |
| if (memcmp(&gss->ip6_remote[i].ip_addr, &ip6->ip_addr, sizeof(ip6->ip_addr)) || |
| gss->ip6_remote[i].udp_port != ip6->udp_port) |
| continue; |
| gss->ip6_remote[i].sig_weight = ip6->sig_weight; |
| gss->ip6_remote[i].data_weight = ip6->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, const struct gprs_ns_ie_ip6_elem *ip6) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| struct gprs_ns2_vc *nsvc; |
| struct osmo_sockaddr sa = {}; |
| const struct osmo_sockaddr *remote; |
| uint8_t new_signal; |
| uint8_t new_data; |
| |
| /* 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". */ |
| |
| if (ip4) { |
| if (update_remote_ip4_elem(gss, ip4)) |
| return -NS_CAUSE_UNKN_IP_EP; |
| |
| /* copy over. Both data structures use network byte order */ |
| sa.u.sin.sin_addr.s_addr = ip4->ip_addr; |
| sa.u.sin.sin_port = ip4->udp_port; |
| sa.u.sin.sin_family = AF_INET; |
| new_signal = ip4->sig_weight; |
| new_data = ip4->data_weight; |
| } else if (ip6) { |
| if (update_remote_ip6_elem(gss, ip6)) |
| return -NS_CAUSE_UNKN_IP_EP; |
| |
| /* copy over. Both data structures use network byte order */ |
| sa.u.sin6.sin6_addr = ip6->ip_addr; |
| sa.u.sin6.sin6_port = ip6->udp_port; |
| sa.u.sin6.sin6_family = AF_INET6; |
| new_signal = ip6->sig_weight; |
| new_data = ip6->data_weight; |
| } else { |
| OSMO_ASSERT(false); |
| } |
| |
| llist_for_each_entry(nsvc, &nse->nsvc, list) { |
| remote = gprs_ns2_ip_vc_remote(nsvc); |
| /* all nsvc in NSE should be IP/UDP nsvc */ |
| OSMO_ASSERT(remote); |
| |
| if (osmo_sockaddr_cmp(&sa, remote)) |
| continue; |
| |
| LOGPFSML(fi, LOGL_INFO, "CHANGE-WEIGHT NS-VC %s data_weight %u->%u, sig_weight %u->%u\n", |
| gprs_ns2_ll_str(nsvc), nsvc->data_weight, new_data, |
| nsvc->sig_weight, new_signal); |
| |
| nsvc->data_weight = new_data; |
| nsvc->sig_weight = new_signal; |
| } |
| |
| return 0; |
| } |
| |
| static int do_sns_delete(struct osmo_fsm_inst *fi, |
| const struct gprs_ns_ie_ip4_elem *ip4, |
| const struct gprs_ns_ie_ip6_elem *ip6) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| struct gprs_ns2_vc *nsvc, *tmp; |
| const struct osmo_sockaddr *remote; |
| struct osmo_sockaddr sa = {}; |
| |
| if (ip4) { |
| if (remove_remote_ip4_elem(gss, ip4) < 0) |
| return -NS_CAUSE_UNKN_IP_EP; |
| /* copy over. Both data structures use network byte order */ |
| sa.u.sin.sin_addr.s_addr = ip4->ip_addr; |
| sa.u.sin.sin_port = ip4->udp_port; |
| sa.u.sin.sin_family = AF_INET; |
| } else if (ip6) { |
| if (remove_remote_ip6_elem(gss, ip6)) |
| return -NS_CAUSE_UNKN_IP_EP; |
| |
| /* copy over. Both data structures use network byte order */ |
| sa.u.sin6.sin6_addr = ip6->ip_addr; |
| sa.u.sin6.sin6_port = ip6->udp_port; |
| sa.u.sin6.sin6_family = AF_INET6; |
| } else { |
| OSMO_ASSERT(false); |
| } |
| |
| llist_for_each_entry_safe(nsvc, tmp, &nse->nsvc, list) { |
| remote = gprs_ns2_ip_vc_remote(nsvc); |
| /* all nsvc in NSE should be IP/UDP nsvc */ |
| OSMO_ASSERT(remote); |
| if (osmo_sockaddr_cmp(&sa, remote)) |
| continue; |
| |
| LOGPFSML(fi, LOGL_INFO, "DELETE NS-VC %s\n", gprs_ns2_ll_str(nsvc)); |
| gprs_ns2_free_nsvc(nsvc); |
| } |
| |
| return 0; |
| } |
| |
| static int do_sns_add(struct osmo_fsm_inst *fi, |
| const struct gprs_ns_ie_ip4_elem *ip4, |
| const struct gprs_ns_ie_ip6_elem *ip6) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| struct gprs_ns2_vc *nsvc; |
| int rc = 0; |
| |
| /* 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". */ |
| switch (gss->ip) { |
| case IPv4: |
| rc = add_remote_ip4_elem(gss, ip4); |
| break; |
| case IPv6: |
| rc = add_remote_ip6_elem(gss, ip6); |
| break; |
| default: |
| /* the gss->ip is initialized with the bss */ |
| OSMO_ASSERT(false); |
| } |
| |
| if (rc) |
| return rc; |
| |
| /* 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" */ |
| switch (gss->ip) { |
| case IPv4: |
| nsvc = nsvc_by_ip4_elem(nse, ip4); |
| if (nsvc) { |
| /* the nsvc should be already in sync with the ip4 / ip6 elements */ |
| return -NS_CAUSE_PROTO_ERR_UNSPEC; |
| } |
| |
| /* TODO: failure case */ |
| ns2_nsvc_create_ip4(fi, nse, ip4); |
| break; |
| case IPv6: |
| nsvc = nsvc_by_ip6_elem(nse, ip6); |
| if (nsvc) { |
| /* the nsvc should be already in sync with the ip4 / ip6 elements */ |
| return -NS_CAUSE_PROTO_ERR_UNSPEC; |
| } |
| |
| /* TODO: failure case */ |
| ns2_nsvc_create_ip6(fi, nse, ip6); |
| break; |
| } |
| |
| gprs_ns2_start_alive_all_nsvcs(nse); |
| |
| return 0; |
| } |
| |
| |
| static void ns2_sns_st_bss_unconfigured(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_BSS); |
| /* empty state - SNS Select will start by ns2_sns_st_all_action() */ |
| } |
| |
| static void ns2_sns_st_bss_size(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| struct gprs_ns2_inst *nsi = nse->nsi; |
| struct tlv_parsed *tp = NULL; |
| |
| OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_BSS); |
| |
| switch (event) { |
| case GPRS_SNS_EV_RX_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_ns2_cause_str(*TLVP_VAL(tp, NS_IE_CAUSE))); |
| /* TODO: What to do? */ |
| } else { |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_BSS_CONFIG_BSS, |
| nsi->timeout[NS_TOUT_TSNS_PROV], 2); |
| } |
| break; |
| default: |
| OSMO_ASSERT(0); |
| } |
| } |
| |
| static int ns2_sns_count_num_local_ep(struct osmo_fsm_inst *fi, enum ns2_sns_type stype) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct ns2_sns_bind *sbind; |
| int count = 0; |
| |
| llist_for_each_entry(sbind, &gss->binds, list) { |
| const struct osmo_sockaddr *sa = gprs_ns2_ip_bind_sockaddr(sbind->bind); |
| if (!sa) |
| continue; |
| |
| switch (stype) { |
| case IPv4: |
| if (sa->u.sas.ss_family == AF_INET) |
| count++; |
| break; |
| case IPv6: |
| if (sa->u.sas.ss_family == AF_INET6) |
| count++; |
| break; |
| } |
| } |
| return count; |
| } |
| |
| static void ns2_sns_compute_local_ep_from_binds(struct osmo_fsm_inst *fi) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns_ie_ip4_elem *ip4_elems; |
| struct gprs_ns_ie_ip6_elem *ip6_elems; |
| struct gprs_ns2_vc_bind *bind; |
| struct ns2_sns_bind *sbind; |
| const struct osmo_sockaddr *remote; |
| const struct osmo_sockaddr *sa; |
| struct osmo_sockaddr local; |
| int count; |
| |
| ns2_clear_ipv46_entries_local(gss); |
| |
| /* no initial available */ |
| if (gss->role == GPRS_SNS_ROLE_BSS) { |
| if (!gss->initial) |
| return; |
| remote = &gss->initial->saddr; |
| } else |
| remote = gprs_ns2_ip_vc_remote(gss->sns_nsvc); |
| |
| /* count how many bindings are available (only UDP binds) */ |
| count = llist_count(&gss->binds); |
| if (count == 0) { |
| LOGPFSML(fi, LOGL_ERROR, "No local binds for this NSE -> cannot determine IP endpoints\n"); |
| return; |
| } |
| |
| switch (gss->ip) { |
| case IPv4: |
| ip4_elems = talloc_realloc(fi, gss->ip4_local, struct gprs_ns_ie_ip4_elem, count); |
| if (!ip4_elems) |
| return; |
| |
| gss->ip4_local = ip4_elems; |
| llist_for_each_entry(sbind, &gss->binds, list) { |
| bind = sbind->bind; |
| sa = gprs_ns2_ip_bind_sockaddr(bind); |
| if (!sa) |
| continue; |
| |
| if (sa->u.sas.ss_family != AF_INET) |
| continue; |
| |
| /* check if this is an specific bind */ |
| if (sa->u.sin.sin_addr.s_addr == 0) { |
| if (osmo_sockaddr_local_ip(&local, remote)) |
| continue; |
| |
| ip4_elems->ip_addr = local.u.sin.sin_addr.s_addr; |
| } else { |
| ip4_elems->ip_addr = sa->u.sin.sin_addr.s_addr; |
| } |
| |
| ip4_elems->udp_port = sa->u.sin.sin_port; |
| ip4_elems->sig_weight = bind->sns_sig_weight; |
| ip4_elems->data_weight = bind->sns_data_weight; |
| ip4_elems++; |
| } |
| |
| gss->num_ip4_local = count; |
| gss->num_max_nsvcs = OSMO_MAX(gss->num_max_ip4_remote * gss->num_ip4_local, 8); |
| break; |
| case IPv6: |
| /* IPv6 */ |
| ip6_elems = talloc_realloc(fi, gss->ip6_local, struct gprs_ns_ie_ip6_elem, count); |
| if (!ip6_elems) |
| return; |
| |
| gss->ip6_local = ip6_elems; |
| |
| llist_for_each_entry(sbind, &gss->binds, list) { |
| bind = sbind->bind; |
| sa = gprs_ns2_ip_bind_sockaddr(bind); |
| if (!sa) |
| continue; |
| |
| if (sa->u.sas.ss_family != AF_INET6) |
| continue; |
| |
| /* check if this is an specific bind */ |
| if (IN6_IS_ADDR_UNSPECIFIED(&sa->u.sin6.sin6_addr)) { |
| if (osmo_sockaddr_local_ip(&local, remote)) |
| continue; |
| |
| ip6_elems->ip_addr = local.u.sin6.sin6_addr; |
| } else { |
| ip6_elems->ip_addr = sa->u.sin6.sin6_addr; |
| } |
| |
| ip6_elems->udp_port = sa->u.sin.sin_port; |
| ip6_elems->sig_weight = bind->sns_sig_weight; |
| ip6_elems->data_weight = bind->sns_data_weight; |
| |
| ip6_elems++; |
| } |
| gss->num_ip6_local = count; |
| gss->num_max_nsvcs = OSMO_MAX(gss->num_max_ip6_remote * gss->num_ip6_local, 8); |
| break; |
| } |
| } |
| |
| /* setup all dynamic SNS settings, create a new nsvc and send the SIZE */ |
| static void ns2_sns_st_bss_size_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| |
| OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_BSS); |
| |
| /* on a generic failure, the timer callback will recover */ |
| if (old_state != GPRS_SNS_ST_UNCONFIGURED) |
| ns2_prim_status_ind(gss->nse, NULL, 0, GPRS_NS2_AFF_CAUSE_SNS_FAILURE); |
| if (old_state != GPRS_SNS_ST_BSS_SIZE) |
| gss->N = 0; |
| |
| gss->alive = false; |
| |
| ns2_sns_compute_local_ep_from_binds(fi); |
| |
| /* take the first bind or take the next bind */ |
| if (!gss->initial_bind) { |
| gss->initial_bind = llist_first_entry(&gss->binds, struct ns2_sns_bind, list); |
| } else { |
| if (gss->initial_bind->list.next != &gss->binds) { |
| gss->initial_bind = llist_entry(gss->initial_bind->list.next, struct ns2_sns_bind, list); |
| } else { |
| gss->initial_bind = llist_first_entry(&gss->binds, struct ns2_sns_bind, list); |
| } |
| } |
| |
| |
| /* setup the NSVC */ |
| if (!gss->sns_nsvc) { |
| struct gprs_ns2_vc_bind *bind = gss->initial_bind->bind; |
| struct osmo_sockaddr *remote = &gss->initial->saddr; |
| gss->sns_nsvc = ns2_ip_bind_connect(bind, gss->nse, remote); |
| if (!gss->sns_nsvc) |
| return; |
| /* A pre-configured endpoint shall not be used for NSE data or signalling traffic |
| * (with the exception of Size and Configuration procedures) unless it is configured |
| * by the SGSN using the auto-configuration procedures */ |
| gss->sns_nsvc->sns_only = true; |
| } |
| |
| if (gss->num_max_ip4_remote > 0) |
| ns2_tx_sns_size(gss->sns_nsvc, true, gss->num_max_nsvcs, gss->num_ip4_local, -1); |
| else |
| ns2_tx_sns_size(gss->sns_nsvc, true, gss->num_max_nsvcs, -1, gss->num_ip6_local); |
| } |
| |
| static void ns2_sns_st_bss_config_bss(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| struct tlv_parsed *tp = NULL; |
| |
| OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_BSS); |
| |
| switch (event) { |
| case GPRS_SNS_EV_RX_CONFIG_ACK: |
| tp = (struct tlv_parsed *) data; |
| if (TLVP_VAL_MINLEN(tp, NS_IE_CAUSE, 1)) { |
| LOGPFSML(fi, LOGL_ERROR, "SNS-CONFIG-ACK with cause %s\n", |
| gprs_ns2_cause_str(*TLVP_VAL(tp, NS_IE_CAUSE))); |
| /* TODO: What to do? */ |
| } else { |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_BSS_CONFIG_SGSN, nse->nsi->timeout[NS_TOUT_TSNS_PROV], 3); |
| } |
| break; |
| default: |
| OSMO_ASSERT(0); |
| } |
| } |
| |
| static void ns2_sns_st_bss_config_bss_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| |
| OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_BSS); |
| |
| if (old_state != GPRS_SNS_ST_BSS_CONFIG_BSS) |
| gss->N = 0; |
| |
| /* Transmit SNS-CONFIG */ |
| switch (gss->ip) { |
| case IPv4: |
| ns2_tx_sns_config(gss->sns_nsvc, true, |
| gss->ip4_local, gss->num_ip4_local, |
| NULL, 0); |
| break; |
| case IPv6: |
| ns2_tx_sns_config(gss->sns_nsvc, true, |
| NULL, 0, |
| gss->ip6_local, gss->num_ip6_local); |
| break; |
| } |
| } |
| |
| /* calculate the timeout of the configured state. the configured |
| * state will fail if not at least one NS-VC is alive within X second. |
| */ |
| static inline int ns_sns_configured_timeout(struct osmo_fsm_inst *fi) |
| { |
| int secs; |
| struct gprs_ns2_inst *nsi = nse_inst_from_fi(fi)->nsi; |
| secs = nsi->timeout[NS_TOUT_TNS_ALIVE] * nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES]; |
| secs += nsi->timeout[NS_TOUT_TNS_TEST]; |
| |
| return secs; |
| } |
| |
| /* append the remote endpoints from the parsed TLV array to the ns2_sns_state */ |
| static int ns_sns_append_remote_eps(struct osmo_fsm_inst *fi, const struct tlv_parsed *tp) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| |
| if (TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) { |
| const struct gprs_ns_ie_ip4_elem *v4_list; |
| unsigned int num_v4; |
| 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); |
| |
| if (num_v4 && gss->ip6_remote) |
| return -NS_CAUSE_INVAL_NR_IPv4_EP; |
| |
| /* 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 (TLVP_PRESENT(tp, NS_IE_IPv6_LIST)) { |
| const struct gprs_ns_ie_ip6_elem *v6_list; |
| unsigned int num_v6; |
| v6_list = (const struct gprs_ns_ie_ip6_elem *) TLVP_VAL(tp, NS_IE_IPv6_LIST); |
| num_v6 = TLVP_LEN(tp, NS_IE_IPv6_LIST) / sizeof(*v6_list); |
| |
| if (num_v6 && gss->ip4_remote) |
| return -NS_CAUSE_INVAL_NR_IPv6_EP; |
| |
| /* realloc to the new size */ |
| gss->ip6_remote = talloc_realloc(gss, gss->ip6_remote, |
| struct gprs_ns_ie_ip6_elem, |
| gss->num_ip6_remote + num_v6); |
| /* append the new entries to the end of the list */ |
| memcpy(&gss->ip6_remote[gss->num_ip6_remote], v6_list, num_v6*sizeof(*v6_list)); |
| gss->num_ip6_remote += num_v6; |
| |
| LOGPFSML(fi, LOGL_INFO, "Rx SNS-CONFIG: Remote IPv6 list now %u entries\n", |
| gss->num_ip6_remote); |
| } |
| |
| return 0; |
| } |
| |
| static void ns2_sns_st_bss_config_sgsn_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| |
| OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_BSS); |
| |
| if (old_state != GPRS_SNS_ST_BSS_CONFIG_SGSN) |
| gss->N = 0; |
| } |
| |
| static void ns2_sns_st_bss_config_sgsn(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| uint8_t cause; |
| int rc; |
| |
| OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_BSS); |
| |
| switch (event) { |
| case GPRS_SNS_EV_RX_CONFIG_END: |
| case GPRS_SNS_EV_RX_CONFIG: |
| rc = ns_sns_append_remote_eps(fi, data); |
| if (rc < 0) { |
| cause = -rc; |
| ns2_tx_sns_config_ack(gss->sns_nsvc, &cause); |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); |
| return; |
| } |
| if (event == GPRS_SNS_EV_RX_CONFIG_END) { |
| /* check if sum of data / sig weights == 0 */ |
| if (nss_weight_sum_data(gss) == 0 || nss_weight_sum_sig(gss) == 0) { |
| cause = NS_CAUSE_INVAL_WEIGH; |
| ns2_tx_sns_config_ack(gss->sns_nsvc, &cause); |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); |
| return; |
| } |
| create_missing_nsvcs(fi); |
| ns2_tx_sns_config_ack(gss->sns_nsvc, NULL); |
| /* start the test procedure on ALL NSVCs! */ |
| gprs_ns2_start_alive_all_nsvcs(nse); |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIGURED, 0, 0); |
| } else { |
| /* just send CONFIG-ACK */ |
| ns2_tx_sns_config_ack(gss->sns_nsvc, NULL); |
| osmo_timer_schedule(&fi->timer, nse->nsi->timeout[NS_TOUT_TSNS_PROV], 0); |
| } |
| break; |
| default: |
| OSMO_ASSERT(0); |
| } |
| } |
| |
| /* called when receiving GPRS_SNS_EV_RX_ADD in state configure */ |
| static void ns2_sns_st_configured_add(struct osmo_fsm_inst *fi, |
| struct ns2_sns_state *gss, |
| struct tlv_parsed *tp) |
| { |
| const struct gprs_ns_ie_ip4_elem *v4_list = NULL; |
| const struct gprs_ns_ie_ip6_elem *v6_list = NULL; |
| int num_v4 = 0, num_v6 = 0; |
| uint8_t trans_id, cause = 0xff; |
| unsigned int i; |
| int rc = 0; |
| |
| /* TODO: refactor EV_ADD/CHANGE/REMOVE by |
| * check uniqueness within the lists (no doublicate entries) |
| * check not-known-by-us and sent back a list of unknown/known values |
| * (abnormal behaviour according to 48.016) |
| */ |
| |
| trans_id = *TLVP_VAL(tp, NS_IE_TRANS_ID); |
| if (gss->ip == IPv4) { |
| if (!TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) { |
| cause = NS_CAUSE_INVAL_NR_IPv4_EP; |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| return; |
| } |
| |
| 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++) { |
| unsigned int j; |
| rc = do_sns_add(fi, &v4_list[i], NULL); |
| if (rc < 0) { |
| /* rollback/undo to restore previous state */ |
| for (j = 0; j < i; j++) |
| do_sns_delete(fi, &v4_list[j], NULL); |
| cause = -rc; |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| break; |
| } |
| } |
| } else { /* IPv6 */ |
| if (!TLVP_PRESENT(tp, NS_IE_IPv6_LIST)) { |
| cause = NS_CAUSE_INVAL_NR_IPv6_EP; |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| return; |
| } |
| |
| v6_list = (const struct gprs_ns_ie_ip6_elem *) TLVP_VAL(tp, NS_IE_IPv6_LIST); |
| num_v6 = TLVP_LEN(tp, NS_IE_IPv6_LIST) / sizeof(*v6_list); |
| for (i = 0; i < num_v6; i++) { |
| unsigned int j; |
| rc = do_sns_add(fi, NULL, &v6_list[i]); |
| if (rc < 0) { |
| /* rollback/undo to restore previous state */ |
| for (j = 0; j < i; j++) |
| do_sns_delete(fi, NULL, &v6_list[j]); |
| cause = -rc; |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| break; |
| } |
| } |
| } |
| |
| /* TODO: correct behaviour is to answer to the *same* NSVC from which the SNS_ADD was received */ |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, NULL, v4_list, num_v4, v6_list, num_v6); |
| } |
| |
| static void ns2_sns_st_configured_delete(struct osmo_fsm_inst *fi, |
| struct ns2_sns_state *gss, |
| struct tlv_parsed *tp) |
| { |
| const struct gprs_ns_ie_ip4_elem *v4_list = NULL; |
| const struct gprs_ns_ie_ip6_elem *v6_list = NULL; |
| int num_v4 = 0, num_v6 = 0; |
| uint8_t trans_id, cause = 0xff; |
| unsigned int i; |
| int rc = 0; |
| |
| /* TODO: split up delete into v4 + v6 |
| * TODO: check if IPv4_LIST or IP_ADDR(v4) is present on IPv6 and vice versa |
| * TODO: check if IPv4_LIST/IPv6_LIST and IP_ADDR is present at the same time |
| */ |
| trans_id = *TLVP_VAL(tp, NS_IE_TRANS_ID); |
| if (gss->ip == IPv4) { |
| 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], NULL); |
| if (rc < 0) { |
| cause = -rc; |
| /* continue to delete others */ |
| } |
| } |
| if (cause != 0xff) { |
| /* TODO: create list of not-deleted and return it */ |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| return; |
| } |
| |
| } else if (TLVP_PRESENT(tp, NS_IE_IP_ADDR) && TLVP_LEN(tp, NS_IE_IP_ADDR) == 5) { |
| /* delete all NS-VCs for given IPv4 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; |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| return; |
| } |
| /* 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], NULL); |
| 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 */ |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| return; |
| } |
| } else { |
| cause = NS_CAUSE_INVAL_NR_IPv4_EP; |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| return; |
| } |
| } else { /* IPv6 */ |
| if (TLVP_PRESENT(tp, NS_IE_IPv6_LIST)) { |
| v6_list = (const struct gprs_ns_ie_ip6_elem *) TLVP_VAL(tp, NS_IE_IPv6_LIST); |
| num_v6 = TLVP_LEN(tp, NS_IE_IPv6_LIST) / sizeof(*v6_list); |
| for (i = 0; i < num_v6; i++) { |
| rc = do_sns_delete(fi, NULL, &v6_list[i]); |
| if (rc < 0) { |
| cause = -rc; |
| /* continue to delete others */ |
| } |
| } |
| if (cause != 0xff) { |
| /* TODO: create list of not-deleted and return it */ |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| return; |
| } |
| } else if (TLVP_PRES_LEN(tp, NS_IE_IP_ADDR, 17)) { |
| /* delete all NS-VCs for given IPv4 address */ |
| const uint8_t *ie = TLVP_VAL(tp, NS_IE_IP_ADDR); |
| struct gprs_ns_ie_ip6_elem *ip6_remote; |
| struct in6_addr ip6_addr; |
| unsigned int i; |
| if (ie[0] != 0x02) { /* Address Type != IPv6 */ |
| cause = NS_CAUSE_UNKN_IP_ADDR; |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| return; |
| } |
| memcpy(&ip6_addr, (ie+1), sizeof(struct in6_addr)); |
| /* make a copy as do_sns_delete() will change the array underneath us */ |
| ip6_remote = talloc_memdup(fi, gss->ip6_remote, |
| gss->num_ip6_remote * sizeof(*v4_list)); |
| for (i = 0; i < gss->num_ip6_remote; i++) { |
| if (!memcmp(&ip6_remote[i].ip_addr, &ip6_addr, sizeof(struct in6_addr))) { |
| rc = do_sns_delete(fi, NULL, &ip6_remote[i]); |
| if (rc < 0) { |
| cause = -rc; |
| /* continue to delete others */ |
| } |
| } |
| } |
| |
| talloc_free(ip6_remote); |
| if (cause != 0xff) { |
| /* TODO: create list of not-deleted and return it */ |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| return; |
| } |
| } else { |
| cause = NS_CAUSE_INVAL_NR_IPv6_EP; |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| return; |
| } |
| } |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, NULL, v4_list, num_v4, v6_list, num_v6); |
| } |
| |
| static void ns2_sns_st_configured_change(struct osmo_fsm_inst *fi, |
| struct ns2_sns_state *gss, |
| struct tlv_parsed *tp) |
| { |
| const struct gprs_ns_ie_ip4_elem *v4_list = NULL; |
| const struct gprs_ns_ie_ip6_elem *v6_list = NULL; |
| int num_v4 = 0, num_v6 = 0; |
| uint8_t trans_id, cause = 0xff; |
| int rc = 0; |
| unsigned int i; |
| |
| 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], NULL); |
| if (rc < 0) { |
| cause = -rc; |
| /* continue to others */ |
| } |
| } |
| if (cause != 0xff) { |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| return; |
| } |
| } else if (TLVP_PRESENT(tp, NS_IE_IPv6_LIST)) { |
| v6_list = (const struct gprs_ns_ie_ip6_elem *) TLVP_VAL(tp, NS_IE_IPv6_LIST); |
| num_v6 = TLVP_LEN(tp, NS_IE_IPv6_LIST) / sizeof(*v6_list); |
| for (i = 0; i < num_v6; i++) { |
| rc = do_sns_change_weight(fi, NULL, &v6_list[i]); |
| if (rc < 0) { |
| cause = -rc; |
| /* continue to others */ |
| } |
| } |
| if (cause != 0xff) { |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| return; |
| } |
| } else { |
| cause = NS_CAUSE_INVAL_NR_IPv4_EP; |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| return; |
| } |
| ns2_tx_sns_ack(gss->sns_nsvc, trans_id, NULL, v4_list, num_v4, v6_list, num_v6); |
| } |
| |
| static void ns2_sns_st_configured(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct tlv_parsed *tp = data; |
| |
| switch (event) { |
| case GPRS_SNS_EV_RX_ADD: |
| ns2_sns_st_configured_add(fi, gss, tp); |
| break; |
| case GPRS_SNS_EV_RX_DELETE: |
| ns2_sns_st_configured_delete(fi, gss, tp); |
| break; |
| case GPRS_SNS_EV_RX_CHANGE_WEIGHT: |
| ns2_sns_st_configured_change(fi, gss, tp); |
| break; |
| case GPRS_SNS_EV_REQ_NSVC_ALIVE: |
| osmo_timer_del(&fi->timer); |
| break; |
| } |
| } |
| |
| static void ns2_sns_st_configured_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) |
| { |
| struct gprs_ns2_vc *nsvc; |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| /* NS-VC status updates are only parsed in ST_CONFIGURED. |
| * Do an initial check if there are any nsvc alive atm */ |
| llist_for_each_entry(nsvc, &nse->nsvc, list) { |
| if (ns2_vc_is_unblocked(nsvc)) { |
| gss->alive = true; |
| osmo_timer_del(&fi->timer); |
| break; |
| } |
| } |
| |
| /* remove the initial NSVC if the NSVC isn't part of the configuration */ |
| if (gss->sns_nsvc->sns_only) |
| gprs_ns2_free_nsvc(gss->sns_nsvc); |
| |
| ns2_prim_status_ind(nse, NULL, 0, GPRS_NS2_AFF_CAUSE_SNS_CONFIGURED); |
| } |
| |
| static const struct osmo_fsm_state ns2_sns_bss_states[] = { |
| [GPRS_SNS_ST_UNCONFIGURED] = { |
| .in_event_mask = 0, /* handled by all_state_action */ |
| .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| S(GPRS_SNS_ST_BSS_SIZE), |
| .name = "UNCONFIGURED", |
| .action = ns2_sns_st_bss_unconfigured, |
| }, |
| [GPRS_SNS_ST_BSS_SIZE] = { |
| .in_event_mask = S(GPRS_SNS_EV_RX_SIZE_ACK), |
| .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| S(GPRS_SNS_ST_BSS_SIZE) | |
| S(GPRS_SNS_ST_BSS_CONFIG_BSS), |
| .name = "BSS_SIZE", |
| .action = ns2_sns_st_bss_size, |
| .onenter = ns2_sns_st_bss_size_onenter, |
| }, |
| [GPRS_SNS_ST_BSS_CONFIG_BSS] = { |
| .in_event_mask = S(GPRS_SNS_EV_RX_CONFIG_ACK), |
| .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| S(GPRS_SNS_ST_BSS_CONFIG_BSS) | |
| S(GPRS_SNS_ST_BSS_CONFIG_SGSN) | |
| S(GPRS_SNS_ST_BSS_SIZE), |
| .name = "BSS_CONFIG_BSS", |
| .action = ns2_sns_st_bss_config_bss, |
| .onenter = ns2_sns_st_bss_config_bss_onenter, |
| }, |
| [GPRS_SNS_ST_BSS_CONFIG_SGSN] = { |
| .in_event_mask = S(GPRS_SNS_EV_RX_CONFIG) | |
| S(GPRS_SNS_EV_RX_CONFIG_END), |
| .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| S(GPRS_SNS_ST_BSS_CONFIG_SGSN) | |
| S(GPRS_SNS_ST_CONFIGURED) | |
| S(GPRS_SNS_ST_BSS_SIZE), |
| .name = "BSS_CONFIG_SGSN", |
| .action = ns2_sns_st_bss_config_sgsn, |
| .onenter = ns2_sns_st_bss_config_sgsn_onenter, |
| }, |
| [GPRS_SNS_ST_CONFIGURED] = { |
| .in_event_mask = S(GPRS_SNS_EV_RX_ADD) | |
| S(GPRS_SNS_EV_RX_DELETE) | |
| S(GPRS_SNS_EV_RX_CHANGE_WEIGHT) | |
| S(GPRS_SNS_EV_REQ_NSVC_ALIVE), |
| .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| S(GPRS_SNS_ST_BSS_SIZE), |
| .name = "CONFIGURED", |
| .action = ns2_sns_st_configured, |
| .onenter = ns2_sns_st_configured_onenter, |
| }, |
| }; |
| |
| static int ns2_sns_fsm_bss_timer_cb(struct osmo_fsm_inst *fi) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| struct gprs_ns2_inst *nsi = nse->nsi; |
| |
| gss->N++; |
| switch (fi->T) { |
| case 1: |
| if (gss->N >= nsi->timeout[NS_TOUT_TSNS_SIZE_RETRIES]) { |
| LOGPFSML(fi, LOGL_ERROR, "NSE %d: Size retries failed. Selecting next IP-SNS endpoint.\n", nse->nsei); |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_REQ_SELECT_ENDPOINT, NULL); |
| } else { |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_BSS_SIZE, nsi->timeout[NS_TOUT_TSNS_PROV], 1); |
| } |
| break; |
| case 2: |
| if (gss->N >= nsi->timeout[NS_TOUT_TSNS_CONFIG_RETRIES]) { |
| LOGPFSML(fi, LOGL_ERROR, "NSE %d: BSS Config retries failed. Selecting next IP-SNS endpoint.\n", nse->nsei); |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_REQ_SELECT_ENDPOINT, NULL); |
| } else { |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_BSS_CONFIG_BSS, nsi->timeout[NS_TOUT_TSNS_PROV], 2); |
| } |
| break; |
| case 3: |
| if (gss->N >= nsi->timeout[NS_TOUT_TSNS_CONFIG_RETRIES]) { |
| LOGPFSML(fi, LOGL_ERROR, "NSE %d: SGSN Config retries failed. Selecting next IP-SNS endpoint.\n", nse->nsei); |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_REQ_SELECT_ENDPOINT, NULL); |
| } else { |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_BSS_CONFIG_SGSN, nsi->timeout[NS_TOUT_TSNS_PROV], 3); |
| } |
| break; |
| case 4: |
| LOGPFSML(fi, LOGL_ERROR, "NSE %d: Config succeeded but no NS-VC came online. Selecting next IP-SNS endpoint.\n", nse->nsei); |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_REQ_SELECT_ENDPOINT, NULL); |
| break; |
| } |
| return 0; |
| } |
| |
| /* common allstate-action for both roles */ |
| static void ns2_sns_st_all_action(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| struct ns2_sns_bind *sbind; |
| struct gprs_ns2_vc *nsvc, *nsvc2; |
| |
| switch (event) { |
| case GPRS_SNS_EV_REQ_ADD_BIND: |
| sbind = data; |
| switch (fi->state) { |
| case GPRS_SNS_ST_UNCONFIGURED: |
| osmo_fsm_inst_dispatch(nse->bss_sns_fi, GPRS_SNS_EV_REQ_SELECT_ENDPOINT, NULL); |
| break; |
| case GPRS_SNS_ST_BSS_SIZE: |
| /* TODO: add the ip4 element to the list */ |
| break; |
| case GPRS_SNS_ST_BSS_CONFIG_BSS: |
| case GPRS_SNS_ST_BSS_CONFIG_SGSN: |
| case GPRS_SNS_ST_CONFIGURED: |
| /* TODO: add to SNS-IP procedure queue & add nsvc() */ |
| break; |
| } |
| break; |
| case GPRS_SNS_EV_REQ_DELETE_BIND: |
| sbind = data; |
| switch (fi->state) { |
| case GPRS_SNS_ST_UNCONFIGURED: |
| break; |
| case GPRS_SNS_ST_BSS_SIZE: |
| /* TODO: remove the ip4 element from the list */ |
| llist_for_each_entry_safe(nsvc, nsvc2, &nse->nsvc, list) { |
| if (nsvc->bind == sbind->bind) { |
| gprs_ns2_free_nsvc(nsvc); |
| } |
| } |
| break; |
| case GPRS_SNS_ST_BSS_CONFIG_BSS: |
| case GPRS_SNS_ST_BSS_CONFIG_SGSN: |
| case GPRS_SNS_ST_CONFIGURED: |
| /* TODO: do an delete SNS-IP procedure */ |
| /* TODO: remove the ip4 element to the list */ |
| llist_for_each_entry_safe(nsvc, nsvc2, &nse->nsvc, list) { |
| if (nsvc->bind == sbind->bind) { |
| gprs_ns2_free_nsvc(nsvc); |
| } |
| } |
| break; |
| } |
| /* if this is the last bind, the free_nsvc() will trigger a reselection */ |
| talloc_free(sbind); |
| break; |
| } |
| } |
| |
| /* allstate-action for BSS role */ |
| static void ns2_sns_st_all_action_bss(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| |
| /* reset when receiving GPRS_SNS_EV_REQ_NO_NSVC */ |
| switch (event) { |
| case GPRS_SNS_EV_REQ_NO_NSVC: |
| /* ignore reselection running */ |
| if (gss->reselection_running) |
| break; |
| |
| LOGPFSML(fi, LOGL_ERROR, "NSE %d: no remaining NSVC, resetting SNS FSM\n", nse->nsei); |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_REQ_SELECT_ENDPOINT, NULL); |
| break; |
| case GPRS_SNS_EV_REQ_SELECT_ENDPOINT: |
| /* tear down previous state |
| * gprs_ns2_free_nsvcs() will trigger NO_NSVC, prevent this from triggering a reselection */ |
| gss->reselection_running = true; |
| gprs_ns2_free_nsvcs(nse); |
| ns2_clear_ipv46_entries_local(gss); |
| ns2_clear_ipv46_entries_remote(gss); |
| |
| /* Choose the next sns endpoint. */ |
| if (llist_empty(&gss->sns_endpoints) || llist_empty(&gss->binds)) { |
| gss->initial = NULL; |
| ns2_prim_status_ind(gss->nse, NULL, 0, GPRS_NS2_AFF_CAUSE_SNS_NO_ENDPOINTS); |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 3); |
| return; |
| } else if (!gss->initial) { |
| gss->initial = llist_first_entry(&gss->sns_endpoints, struct sns_endpoint, list); |
| } else if (gss->initial->list.next == &gss->sns_endpoints) { |
| /* last entry, continue with first */ |
| gss->initial = llist_first_entry(&gss->sns_endpoints, struct sns_endpoint, list); |
| } else { |
| /* next element is an entry */ |
| gss->initial = llist_entry(gss->initial->list.next, struct sns_endpoint, list); |
| } |
| |
| gss->reselection_running = false; |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_BSS_SIZE, nse->nsi->timeout[NS_TOUT_TSNS_PROV], 1); |
| break; |
| default: |
| ns2_sns_st_all_action(fi, event, data); |
| break; |
| } |
| } |
| |
| static struct osmo_fsm gprs_ns2_sns_bss_fsm = { |
| .name = "GPRS-NS2-SNS-BSS", |
| .states = ns2_sns_bss_states, |
| .num_states = ARRAY_SIZE(ns2_sns_bss_states), |
| .allstate_event_mask = S(GPRS_SNS_EV_REQ_NO_NSVC) | |
| S(GPRS_SNS_EV_REQ_SELECT_ENDPOINT) | |
| S(GPRS_SNS_EV_REQ_ADD_BIND) | |
| S(GPRS_SNS_EV_REQ_DELETE_BIND), |
| .allstate_action = ns2_sns_st_all_action_bss, |
| .cleanup = NULL, |
| .timer_cb = ns2_sns_fsm_bss_timer_cb, |
| .event_names = gprs_sns_event_names, |
| .pre_term = NULL, |
| .log_subsys = DLNS, |
| }; |
| |
| /*! Allocate an IP-SNS FSM for the BSS side. |
| * \param[in] nse NS Entity in which the FSM runs |
| * \param[in] id string identifier |
| * \returns FSM instance on success; NULL on error */ |
| struct osmo_fsm_inst *ns2_sns_bss_fsm_alloc(struct gprs_ns2_nse *nse, |
| const char *id) |
| { |
| struct osmo_fsm_inst *fi; |
| struct ns2_sns_state *gss; |
| |
| fi = osmo_fsm_inst_alloc(&gprs_ns2_sns_bss_fsm, nse, NULL, LOGL_DEBUG, id); |
| if (!fi) |
| return fi; |
| |
| gss = talloc_zero(fi, struct ns2_sns_state); |
| if (!gss) |
| goto err; |
| |
| fi->priv = gss; |
| gss->nse = nse; |
| gss->role = GPRS_SNS_ROLE_BSS; |
| /* The SGSN doesn't tell the BSS, so we assume there's always sufficient */ |
| gss->num_max_ip4_remote = 8192; |
| gss->num_max_ip6_remote = 8192; |
| INIT_LLIST_HEAD(&gss->sns_endpoints); |
| INIT_LLIST_HEAD(&gss->binds); |
| |
| return fi; |
| err: |
| osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL); |
| return NULL; |
| } |
| |
| /*! main entry point for receiving SNS messages from the network. |
| * \param[in] nsvc NS-VC on which the message was received |
| * \param[in] msg message buffer of the IP-SNS message |
| * \param[in] tp parsed TLV structure of message |
| * \returns 0 on success; negative on error */ |
| int ns2_sns_rx(struct gprs_ns2_vc *nsvc, struct msgb *msg, struct tlv_parsed *tp) |
| { |
| struct gprs_ns2_nse *nse = nsvc->nse; |
| struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
| uint16_t nsei = nsvc->nse->nsei; |
| struct ns2_sns_state *gss; |
| struct osmo_fsm_inst *fi; |
| int rc = 0; |
| |
| if (!nse->bss_sns_fi) { |
| LOGNSVC(nsvc, LOGL_NOTICE, "Rx %s for NS Instance that has no SNS!\n", |
| get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); |
| rc = -EINVAL; |
| goto out; |
| } |
| |
| /* FIXME: how to resolve SNS FSM Instance by NSEI (SGSN)? */ |
| fi = nse->bss_sns_fi; |
| gss = (struct ns2_sns_state *) fi->priv; |
| if (!gss->sns_nsvc) |
| gss->sns_nsvc = nsvc; |
| |
| LOGPFSML(fi, LOGL_DEBUG, "NSEI=%u Rx SNS PDU type %s\n", nsei, |
| get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); |
| |
| switch (nsh->pdu_type) { |
| case SNS_PDUT_SIZE: |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_RX_SIZE, tp); |
| break; |
| case SNS_PDUT_SIZE_ACK: |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_RX_SIZE_ACK, tp); |
| break; |
| case SNS_PDUT_CONFIG: |
| if (nsh->data[0] & 0x01) |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_RX_CONFIG_END, tp); |
| else |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_RX_CONFIG, tp); |
| break; |
| case SNS_PDUT_CONFIG_ACK: |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_RX_CONFIG_ACK, tp); |
| break; |
| case SNS_PDUT_ADD: |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_RX_ADD, tp); |
| break; |
| case SNS_PDUT_DELETE: |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_RX_DELETE, tp); |
| break; |
| case SNS_PDUT_CHANGE_WEIGHT: |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_RX_CHANGE_WEIGHT, tp); |
| break; |
| case SNS_PDUT_ACK: |
| osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_RX_ACK, tp); |
| break; |
| default: |
| LOGPFSML(fi, LOGL_ERROR, "NSEI=%u Rx unknown SNS PDU type %s\n", nsei, |
| get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); |
| rc = -EINVAL; |
| } |
| |
| out: |
| msgb_free(msg); |
| |
| return rc; |
| } |
| |
| #include <osmocom/vty/vty.h> |
| #include <osmocom/vty/misc.h> |
| |
| static void vty_dump_sns_ip4(struct vty *vty, const char *prefix, const struct gprs_ns_ie_ip4_elem *ip4) |
| { |
| struct in_addr in = { .s_addr = ip4->ip_addr }; |
| vty_out(vty, "%s %s:%u, Signalling Weight: %u, Data Weight: %u%s", prefix, |
| inet_ntoa(in), ntohs(ip4->udp_port), ip4->sig_weight, ip4->data_weight, VTY_NEWLINE); |
| } |
| |
| static void vty_dump_sns_ip6(struct vty *vty, const char *prefix, const struct gprs_ns_ie_ip6_elem *ip6) |
| { |
| char ip_addr[INET6_ADDRSTRLEN] = {}; |
| if (!inet_ntop(AF_INET6, &ip6->ip_addr, ip_addr, (INET6_ADDRSTRLEN))) |
| strcpy(ip_addr, "Invalid IPv6"); |
| |
| vty_out(vty, "%s %s:%u, Signalling Weight: %u, Data Weight: %u%s", prefix, |
| ip_addr, ntohs(ip6->udp_port), ip6->sig_weight, ip6->data_weight, VTY_NEWLINE); |
| } |
| |
| /*! Dump the IP-SNS state to a vty. |
| * \param[in] vty VTY to which the state shall be printed |
| * \param[in] prefix prefix to print at start of each line (typically indenting) |
| * \param[in] nse NS Entity whose IP-SNS state shall be printed |
| * \param[in] stats Whether or not statistics shall also be printed */ |
| void ns2_sns_dump_vty(struct vty *vty, const char *prefix, const struct gprs_ns2_nse *nse, bool stats) |
| { |
| struct ns2_sns_state *gss; |
| unsigned int i; |
| |
| if (!nse->bss_sns_fi) |
| return; |
| |
| vty_out_fsm_inst2(vty, prefix, nse->bss_sns_fi); |
| gss = (struct ns2_sns_state *) nse->bss_sns_fi->priv; |
| |
| vty_out(vty, "%sMaximum number of remote NS-VCs: %zu, IPv4 Endpoints: %zu, IPv6 Endpoints: %zu%s", |
| prefix, gss->num_max_nsvcs, gss->num_max_ip4_remote, gss->num_max_ip6_remote, VTY_NEWLINE); |
| |
| if (gss->num_ip4_local && gss->num_ip4_remote) { |
| vty_out(vty, "%sLocal IPv4 Endpoints:%s", prefix, VTY_NEWLINE); |
| for (i = 0; i < gss->num_ip4_local; i++) |
| vty_dump_sns_ip4(vty, prefix, &gss->ip4_local[i]); |
| |
| vty_out(vty, "%sRemote IPv4 Endpoints:%s", prefix, VTY_NEWLINE); |
| for (i = 0; i < gss->num_ip4_remote; i++) |
| vty_dump_sns_ip4(vty, prefix, &gss->ip4_remote[i]); |
| } |
| |
| if (gss->num_ip6_local && gss->num_ip6_remote) { |
| vty_out(vty, "%sLocal IPv6 Endpoints:%s", prefix, VTY_NEWLINE); |
| for (i = 0; i < gss->num_ip6_local; i++) |
| vty_dump_sns_ip6(vty, prefix, &gss->ip6_local[i]); |
| |
| vty_out(vty, "%sRemote IPv6 Endpoints:%s", prefix, VTY_NEWLINE); |
| for (i = 0; i < gss->num_ip6_remote; i++) |
| vty_dump_sns_ip6(vty, prefix, &gss->ip6_remote[i]); |
| } |
| } |
| |
| /*! write IP-SNS to a vty |
| * \param[in] vty VTY to which the state shall be printed |
| * \param[in] nse NS Entity whose IP-SNS state shall be printed */ |
| void ns2_sns_write_vty(struct vty *vty, const struct gprs_ns2_nse *nse) |
| { |
| struct ns2_sns_state *gss; |
| struct osmo_sockaddr_str addr_str; |
| struct sns_endpoint *endpoint; |
| |
| if (!nse->bss_sns_fi) |
| return; |
| |
| gss = (struct ns2_sns_state *) nse->bss_sns_fi->priv; |
| llist_for_each_entry(endpoint, &gss->sns_endpoints, list) { |
| /* It's unlikely that an error happens, but let's better be safe. */ |
| if (osmo_sockaddr_str_from_sockaddr(&addr_str, &endpoint->saddr.u.sas) != 0) |
| addr_str = (struct osmo_sockaddr_str) { .ip = "<INVALID>" }; |
| vty_out(vty, " ip-sns-remote %s %u%s", addr_str.ip, addr_str.port, VTY_NEWLINE); |
| } |
| } |
| |
| static struct sns_endpoint *ns2_get_sns_endpoint(struct ns2_sns_state *state, |
| const struct osmo_sockaddr *saddr) |
| { |
| struct sns_endpoint *endpoint; |
| |
| llist_for_each_entry(endpoint, &state->sns_endpoints, list) { |
| if (!osmo_sockaddr_cmp(saddr, &endpoint->saddr)) |
| return endpoint; |
| } |
| |
| return NULL; |
| } |
| |
| /*! gprs_ns2_sns_add_endpoint |
| * \param[in] nse |
| * \param[in] sockaddr |
| * \return |
| */ |
| int gprs_ns2_sns_add_endpoint(struct gprs_ns2_nse *nse, |
| const struct osmo_sockaddr *saddr) |
| { |
| struct ns2_sns_state *gss; |
| struct sns_endpoint *endpoint; |
| bool do_selection = false; |
| |
| if (nse->ll != GPRS_NS2_LL_UDP) { |
| return -EINVAL; |
| } |
| |
| if (nse->dialect != GPRS_NS2_DIALECT_SNS) { |
| return -EINVAL; |
| } |
| |
| gss = nse->bss_sns_fi->priv; |
| |
| if (ns2_get_sns_endpoint(gss, saddr)) |
| return -EADDRINUSE; |
| |
| endpoint = talloc_zero(nse->bss_sns_fi->priv, struct sns_endpoint); |
| if (!endpoint) |
| return -ENOMEM; |
| |
| endpoint->saddr = *saddr; |
| if (llist_empty(&gss->sns_endpoints)) |
| do_selection = true; |
| |
| llist_add_tail(&endpoint->list, &gss->sns_endpoints); |
| if (do_selection) |
| osmo_fsm_inst_dispatch(nse->bss_sns_fi, GPRS_SNS_EV_REQ_SELECT_ENDPOINT, NULL); |
| |
| return 0; |
| } |
| |
| /*! gprs_ns2_sns_del_endpoint |
| * \param[in] nse |
| * \param[in] sockaddr |
| * \return 0 on success, otherwise < 0 |
| */ |
| int gprs_ns2_sns_del_endpoint(struct gprs_ns2_nse *nse, |
| const struct osmo_sockaddr *saddr) |
| { |
| struct ns2_sns_state *gss; |
| struct sns_endpoint *endpoint; |
| |
| if (nse->ll != GPRS_NS2_LL_UDP) { |
| return -EINVAL; |
| } |
| |
| if (nse->dialect != GPRS_NS2_DIALECT_SNS) { |
| return -EINVAL; |
| } |
| |
| gss = nse->bss_sns_fi->priv; |
| endpoint = ns2_get_sns_endpoint(gss, saddr); |
| if (!endpoint) |
| return -ENOENT; |
| |
| /* if this is an unused SNS endpoint it's done */ |
| if (gss->initial != endpoint) { |
| llist_del(&endpoint->list); |
| talloc_free(endpoint); |
| return 0; |
| } |
| |
| /* gprs_ns2_free_nsvcs() will trigger GPRS_SNS_EV_REQ_NO_NSVC on the last NS-VC |
| * and restart SNS SIZE procedure which selects a new initial */ |
| LOGNSE(nse, LOGL_INFO, "Current in-use SNS endpoint is being removed." |
| "Closing all NS-VC and restart SNS-SIZE procedure" |
| "with a remaining SNS endpoint.\n"); |
| |
| /* Continue with the next endpoint in the list. |
| * Special case if the endpoint is at the start or end of the list */ |
| if (endpoint->list.prev == &gss->sns_endpoints || |
| endpoint->list.next == &gss->sns_endpoints) |
| gss->initial = NULL; |
| else |
| gss->initial = llist_entry(endpoint->list.next->prev, |
| struct sns_endpoint, |
| list); |
| |
| llist_del(&endpoint->list); |
| gprs_ns2_free_nsvcs(nse); |
| talloc_free(endpoint); |
| |
| return 0; |
| } |
| |
| /*! gprs_ns2_sns_count |
| * \param[in] nse NS Entity whose IP-SNS endpoints shall be printed |
| * \return the count of endpoints or < 0 if NSE doesn't contain sns. |
| */ |
| int gprs_ns2_sns_count(struct gprs_ns2_nse *nse) |
| { |
| struct ns2_sns_state *gss; |
| struct sns_endpoint *endpoint; |
| int count = 0; |
| |
| if (nse->ll != GPRS_NS2_LL_UDP) { |
| return -EINVAL; |
| } |
| |
| if (nse->dialect != GPRS_NS2_DIALECT_SNS) { |
| return -EINVAL; |
| } |
| |
| gss = nse->bss_sns_fi->priv; |
| llist_for_each_entry(endpoint, &gss->sns_endpoints, list) |
| count++; |
| |
| return count; |
| } |
| |
| void ns2_sns_notify_alive(struct gprs_ns2_nse *nse, struct gprs_ns2_vc *nsvc, bool alive) |
| { |
| struct ns2_sns_state *gss; |
| struct gprs_ns2_vc *tmp; |
| |
| if (!nse->bss_sns_fi) |
| return; |
| |
| gss = nse->bss_sns_fi->priv; |
| if(nse->bss_sns_fi->state != GPRS_SNS_ST_CONFIGURED) |
| return; |
| |
| if (alive == gss->alive) |
| return; |
| |
| /* check if this is the current SNS NS-VC */ |
| if (nsvc == gss->sns_nsvc) { |
| /* only replace the SNS NS-VC if there are other alive NS-VC. |
| * There aren't any other alive NS-VC when the SNS fsm just reached CONFIGURED |
| * and couldn't confirm yet if the NS-VC comes up */ |
| if (gss->alive && !alive) |
| ns2_sns_replace_nsvc(nsvc); |
| } |
| |
| if (alive) { |
| gss->alive = true; |
| osmo_fsm_inst_dispatch(nse->bss_sns_fi, GPRS_SNS_EV_REQ_NSVC_ALIVE, NULL); |
| } else { |
| /* is there at least another alive nsvc? */ |
| llist_for_each_entry(tmp, &nse->nsvc, list) { |
| if (ns2_vc_is_unblocked(tmp)) |
| return; |
| } |
| |
| /* all NS-VC have failed */ |
| gss->alive = false; |
| osmo_fsm_inst_dispatch(nse->bss_sns_fi, GPRS_SNS_EV_REQ_NO_NSVC, NULL); |
| } |
| } |
| |
| int gprs_ns2_sns_add_bind(struct gprs_ns2_nse *nse, |
| struct gprs_ns2_vc_bind *bind) |
| { |
| struct ns2_sns_state *gss; |
| struct ns2_sns_bind *tmp; |
| |
| OSMO_ASSERT(nse->bss_sns_fi); |
| gss = nse->bss_sns_fi->priv; |
| |
| if (!gprs_ns2_is_ip_bind(bind)) { |
| return -EINVAL; |
| } |
| |
| if (!llist_empty(&gss->binds)) { |
| llist_for_each_entry(tmp, &gss->binds, list) { |
| if (tmp->bind == bind) |
| return -EALREADY; |
| } |
| } |
| |
| tmp = talloc_zero(gss, struct ns2_sns_bind); |
| if (!tmp) |
| return -ENOMEM; |
| tmp->bind = bind; |
| llist_add_tail(&tmp->list, &gss->binds); |
| |
| osmo_fsm_inst_dispatch(nse->bss_sns_fi, GPRS_SNS_EV_REQ_ADD_BIND, tmp); |
| return 0; |
| } |
| |
| /* Remove a bind from the SNS. All assosiated NSVC must be removed. */ |
| int gprs_ns2_sns_del_bind(struct gprs_ns2_nse *nse, |
| struct gprs_ns2_vc_bind *bind) |
| { |
| struct ns2_sns_state *gss; |
| struct ns2_sns_bind *tmp, *tmp2; |
| bool found = false; |
| |
| if (!nse->bss_sns_fi) |
| return -EINVAL; |
| |
| gss = nse->bss_sns_fi->priv; |
| if (gss->initial_bind && gss->initial_bind->bind == bind) { |
| if (gss->initial_bind->list.prev == &gss->binds) |
| gss->initial_bind = NULL; |
| else |
| gss->initial_bind = llist_entry(gss->initial_bind->list.prev, struct ns2_sns_bind, list); |
| } |
| |
| llist_for_each_entry_safe(tmp, tmp2, &gss->binds, list) { |
| if (tmp->bind == bind) { |
| llist_del(&tmp->list); |
| found = true; |
| } |
| } |
| |
| if (!found) |
| return -ENOENT; |
| |
| osmo_fsm_inst_dispatch(nse->bss_sns_fi, GPRS_SNS_EV_REQ_DELETE_BIND, tmp); |
| return 0; |
| } |
| |
| /* Update SNS weights |
| * \param[in] nsvc the NSVC which should be updated |
| */ |
| void ns2_sns_update_weights(struct gprs_ns2_vc_bind *bind) |
| { |
| /* TODO: implement weights after binds per sns implemented */ |
| } |
| |
| |
| |
| |
| /*********************************************************************** |
| * SGSN role |
| ***********************************************************************/ |
| |
| static void ns2_sns_st_sgsn_unconfigured(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_SGSN); |
| /* do nothing; Rx SNS-SIZE handled in ns2_sns_st_all_action_sgsn() */ |
| } |
| |
| /* We're waiting for inbound SNS-CONFIG from the BSS */ |
| static void ns2_sns_st_sgsn_wait_config(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| struct gprs_ns2_inst *nsi = nse->nsi; |
| uint8_t cause; |
| int rc; |
| |
| OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_SGSN); |
| |
| switch (event) { |
| case GPRS_SNS_EV_RX_CONFIG: |
| case GPRS_SNS_EV_RX_CONFIG_END: |
| rc = ns_sns_append_remote_eps(fi, data); |
| if (rc < 0) { |
| cause = -rc; |
| ns2_tx_sns_config_ack(gss->sns_nsvc, &cause); |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); |
| return; |
| } |
| /* only change state if last CONFIG was received */ |
| if (event == GPRS_SNS_EV_RX_CONFIG_END) { |
| /* ensure sum of data weight / sig weights is > 0 */ |
| if (nss_weight_sum_data(gss) == 0 || nss_weight_sum_sig(gss) == 0) { |
| cause = NS_CAUSE_INVAL_WEIGH; |
| ns2_tx_sns_config_ack(gss->sns_nsvc, &cause); |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); |
| break; |
| } |
| ns2_tx_sns_config_ack(gss->sns_nsvc, NULL); |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SGSN_WAIT_CONFIG_ACK, nsi->timeout[NS_TOUT_TSNS_PROV], 3); |
| } else { |
| /* just send CONFIG-ACK */ |
| ns2_tx_sns_config_ack(gss->sns_nsvc, NULL); |
| osmo_timer_schedule(&fi->timer, nse->nsi->timeout[NS_TOUT_TSNS_PROV], 0); |
| } |
| break; |
| } |
| } |
| |
| static void ns2_sns_st_sgsn_wait_config_ack_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_SGSN); |
| |
| /* transmit SGSN-oriented SNS-CONFIG */ |
| ns2_tx_sns_config(gss->sns_nsvc, true, gss->ip4_local, gss->num_ip4_local, |
| gss->ip6_local, gss->num_ip6_local); |
| } |
| |
| /* We're waiting for SNS-CONFIG-ACK from the BSS (in response to our outbound SNS-CONFIG) */ |
| static void ns2_sns_st_sgsn_wait_config_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| struct tlv_parsed *tp = NULL; |
| |
| OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_SGSN); |
| |
| switch (event) { |
| case GPRS_SNS_EV_RX_CONFIG_ACK: |
| tp = data; |
| if (TLVP_VAL_MINLEN(tp, NS_IE_CAUSE, 1)) { |
| LOGPFSML(fi, LOGL_ERROR, "Rx SNS-CONFIG-ACK with cause %s\n", |
| gprs_ns2_cause_str(*TLVP_VAL(tp, NS_IE_CAUSE))); |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); |
| break; |
| } |
| /* we currently only send one SNS-CONFIG with END FLAG */ |
| if (true) { |
| create_missing_nsvcs(fi); |
| /* start the test procedure on ALL NSVCs! */ |
| gprs_ns2_start_alive_all_nsvcs(nse); |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIGURED, ns_sns_configured_timeout(fi), 4); |
| } |
| break; |
| } |
| } |
| |
| /* SGSN-side SNS state machine */ |
| static const struct osmo_fsm_state ns2_sns_sgsn_states[] = { |
| [GPRS_SNS_ST_UNCONFIGURED] = { |
| .in_event_mask = 0, /* handled by all_state_action */ |
| .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| S(GPRS_SNS_ST_SGSN_WAIT_CONFIG), |
| .name = "UNCONFIGURED", |
| .action = ns2_sns_st_sgsn_unconfigured, |
| }, |
| [GPRS_SNS_ST_SGSN_WAIT_CONFIG] = { |
| .in_event_mask = S(GPRS_SNS_EV_RX_CONFIG) | |
| S(GPRS_SNS_EV_RX_CONFIG_END), |
| .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| S(GPRS_SNS_ST_SGSN_WAIT_CONFIG) | |
| S(GPRS_SNS_ST_SGSN_WAIT_CONFIG_ACK), |
| .name = "SGSN_WAIT_CONFIG", |
| .action = ns2_sns_st_sgsn_wait_config, |
| }, |
| [GPRS_SNS_ST_SGSN_WAIT_CONFIG_ACK] = { |
| .in_event_mask = S(GPRS_SNS_EV_RX_CONFIG_ACK), |
| .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| S(GPRS_SNS_ST_SGSN_WAIT_CONFIG_ACK) | |
| S(GPRS_SNS_ST_CONFIGURED), |
| .name = "SGSN_WAIT_CONFIG_ACK", |
| .action = ns2_sns_st_sgsn_wait_config_ack, |
| .onenter = ns2_sns_st_sgsn_wait_config_ack_onenter, |
| }, |
| [GPRS_SNS_ST_CONFIGURED] = { |
| .in_event_mask = S(GPRS_SNS_EV_RX_ADD) | |
| S(GPRS_SNS_EV_RX_DELETE) | |
| S(GPRS_SNS_EV_RX_CHANGE_WEIGHT) | |
| S(GPRS_SNS_EV_REQ_NSVC_ALIVE), |
| .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED), |
| .name = "CONFIGURED", |
| /* shared with BSS side; once configured there's no difference */ |
| .action = ns2_sns_st_configured, |
| .onenter = ns2_sns_st_configured_onenter, |
| }, |
| }; |
| |
| static int ns2_sns_fsm_sgsn_timer_cb(struct osmo_fsm_inst *fi) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| struct gprs_ns2_inst *nsi = nse->nsi; |
| |
| gss->N++; |
| switch (fi->T) { |
| case 3: |
| if (gss->N >= nsi->timeout[NS_TOUT_TSNS_CONFIG_RETRIES]) { |
| LOGPFSML(fi, LOGL_ERROR, "NSE %d: SGSN Config retries failed. Giving up.\n", nse->nsei); |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, nsi->timeout[NS_TOUT_TSNS_PROV], 3); |
| } else { |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SGSN_WAIT_CONFIG_ACK, nsi->timeout[NS_TOUT_TSNS_PROV], 3); |
| } |
| break; |
| case 4: |
| LOGPFSML(fi, LOGL_ERROR, "NSE %d: Config succeeded but no NS-VC came online.\n", nse->nsei); |
| break; |
| } |
| return 0; |
| } |
| |
| |
| /* allstate-action for SGSN role */ |
| static void ns2_sns_st_all_action_sgsn(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| struct tlv_parsed *tp = NULL; |
| size_t num_local_eps, num_remote_eps; |
| uint8_t flag; |
| uint8_t cause; |
| |
| OSMO_ASSERT(gss->role == GPRS_SNS_ROLE_SGSN); |
| |
| switch (event) { |
| case GPRS_SNS_EV_RX_SIZE: |
| tp = (struct tlv_parsed *) data; |
| /* check for mandatory / conditional IEs */ |
| if (!TLVP_PRES_LEN(tp, NS_IE_RESET_FLAG, 1) || |
| !TLVP_PRES_LEN(tp, NS_IE_MAX_NR_NSVC, 2)) { |
| cause = NS_CAUSE_MISSING_ESSENT_IE; |
| ns2_tx_sns_size_ack(gss->sns_nsvc, &cause); |
| break; |
| } |
| if (!TLVP_PRES_LEN(tp, NS_IE_IPv4_EP_NR, 2) && |
| !TLVP_PRES_LEN(tp, NS_IE_IPv6_EP_NR, 2)) { |
| cause = NS_CAUSE_MISSING_ESSENT_IE; |
| ns2_tx_sns_size_ack(gss->sns_nsvc, &cause); |
| break; |
| } |
| if (TLVP_PRES_LEN(tp, NS_IE_IPv4_EP_NR, 2)) |
| gss->num_max_ip4_remote = tlvp_val16be(tp, NS_IE_IPv4_EP_NR); |
| if (TLVP_PRES_LEN(tp, NS_IE_IPv6_EP_NR, 2)) |
| gss->num_max_ip6_remote = tlvp_val16be(tp, NS_IE_IPv6_EP_NR); |
| /* decide if we go for IPv4 or IPv6 */ |
| if (gss->num_max_ip6_remote && ns2_sns_count_num_local_ep(fi, IPv6)) { |
| gss->ip = IPv6; |
| ns2_sns_compute_local_ep_from_binds(fi); |
| num_local_eps = gss->num_ip6_local; |
| num_remote_eps = gss->num_max_ip6_remote; |
| } else if (gss->num_max_ip4_remote && ns2_sns_count_num_local_ep(fi, IPv4)) { |
| gss->ip = IPv4; |
| ns2_sns_compute_local_ep_from_binds(fi); |
| num_local_eps = gss->num_ip4_local; |
| num_remote_eps = gss->num_max_ip4_remote; |
| } else { |
| if (gss->num_ip4_local && !gss->num_max_ip4_remote) |
| cause = NS_CAUSE_INVAL_NR_IPv4_EP; |
| else |
| cause = NS_CAUSE_INVAL_NR_IPv6_EP; |
| ns2_tx_sns_size_ack(gss->sns_nsvc, &cause); |
| break; |
| } |
| /* ensure number of NS-VCs is sufficient for full mesh */ |
| gss->num_max_nsvcs = tlvp_val16be(tp, NS_IE_MAX_NR_NSVC); |
| if (gss->num_max_nsvcs < num_remote_eps * num_local_eps) { |
| LOGPFSML(fi, LOGL_ERROR, "%zu local and %zu remote EPs, requires %zu NS-VC, " |
| "but BSS supports only %zu maximum NS-VCs\n", num_local_eps, |
| num_remote_eps, num_local_eps * num_remote_eps, gss->num_max_nsvcs); |
| cause = NS_CAUSE_INVAL_NR_NS_VC; |
| ns2_tx_sns_size_ack(gss->sns_nsvc, &cause); |
| break; |
| } |
| /* perform state reset, if requested */ |
| flag = *TLVP_VAL(tp, NS_IE_RESET_FLAG); |
| if (flag & 1) { |
| struct gprs_ns2_vc *nsvc, *nsvc2; |
| /* clear all state */ |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); |
| gss->N = 0; |
| ns2_clear_ipv46_entries_local(gss); |
| ns2_clear_ipv46_entries_remote(gss); |
| llist_for_each_entry_safe(nsvc, nsvc2, &gss->nse->nsvc, list) { |
| if (nsvc == gss->sns_nsvc) { |
| /* keep the NSVC we need for SNS, but unconfigure it */ |
| nsvc->sig_weight = 0; |
| nsvc->data_weight = 0; |
| ns2_vc_force_unconfigured(nsvc); |
| } else { |
| /* free all other NS-VCs */ |
| gprs_ns2_free_nsvc(nsvc); |
| } |
| } |
| ns2_sns_compute_local_ep_from_binds(fi); |
| } |
| /* send SIZE_ACK */ |
| ns2_tx_sns_size_ack(gss->sns_nsvc, NULL); |
| /* only wait for SNS-CONFIG in case of Reset flag */ |
| if (flag & 1) |
| osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SGSN_WAIT_CONFIG, 0, 0); |
| break; |
| default: |
| ns2_sns_st_all_action(fi, event, data); |
| break; |
| } |
| } |
| |
| static struct osmo_fsm gprs_ns2_sns_sgsn_fsm = { |
| .name = "GPRS-NS2-SNS-SGSN", |
| .states = ns2_sns_sgsn_states, |
| .num_states = ARRAY_SIZE(ns2_sns_sgsn_states), |
| .allstate_event_mask = S(GPRS_SNS_EV_RX_SIZE) | |
| S(GPRS_SNS_EV_REQ_NO_NSVC) | |
| S(GPRS_SNS_EV_REQ_ADD_BIND) | |
| S(GPRS_SNS_EV_REQ_DELETE_BIND), |
| .allstate_action = ns2_sns_st_all_action_sgsn, |
| .cleanup = NULL, |
| .timer_cb = ns2_sns_fsm_sgsn_timer_cb, |
| .event_names = gprs_sns_event_names, |
| .pre_term = NULL, |
| .log_subsys = DLNS, |
| }; |
| |
| /*! Allocate an IP-SNS FSM for the SGSN side. |
| * \param[in] nse NS Entity in which the FSM runs |
| * \param[in] id string identifier |
| * \returns FSM instance on success; NULL on error */ |
| struct osmo_fsm_inst *ns2_sns_sgsn_fsm_alloc(struct gprs_ns2_nse *nse, const char *id) |
| { |
| struct osmo_fsm_inst *fi; |
| struct ns2_sns_state *gss; |
| |
| fi = osmo_fsm_inst_alloc(&gprs_ns2_sns_sgsn_fsm, nse, NULL, LOGL_DEBUG, id); |
| if (!fi) |
| return fi; |
| |
| gss = talloc_zero(fi, struct ns2_sns_state); |
| if (!gss) |
| goto err; |
| |
| fi->priv = gss; |
| gss->nse = nse; |
| gss->role = GPRS_SNS_ROLE_SGSN; |
| INIT_LLIST_HEAD(&gss->sns_endpoints); |
| INIT_LLIST_HEAD(&gss->binds); |
| |
| return fi; |
| err: |
| osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL); |
| return NULL; |
| } |
| |
| |
| |
| |
| /* initialize osmo_ctx on main tread */ |
| static __attribute__((constructor)) void on_dso_load_ctx(void) |
| { |
| OSMO_ASSERT(osmo_fsm_register(&gprs_ns2_sns_bss_fsm) == 0); |
| OSMO_ASSERT(osmo_fsm_register(&gprs_ns2_sns_sgsn_fsm) == 0); |
| } |