lynxis lazus has uploaded this change for review. (
https://gerrit.osmocom.org/c/libosmocore/+/21484 )
Change subject: gprs_ns2: introduce NS dialects
......................................................................
gprs_ns2: introduce NS dialects
A NS dialect describes how the NS Entity interacts with
different virtual circuits. E.g. ipaccess use reset/block on udp
and is a dynamic connection.
A single NS Entity can only support one dialect. This can be later
used to protect a NS Entity against dynamic NS virtual circuits of a
different type.
It further allows a bind to support multiple dialects at the same time.
Change-Id: Ia118bb6f994845d84db09de7a94856f5ca573404
---
M include/osmocom/gprs/gprs_ns2.h
M src/gb/gprs_ns2.c
M src/gb/gprs_ns2_fr.c
M src/gb/gprs_ns2_internal.h
M src/gb/gprs_ns2_udp.c
M src/gb/gprs_ns2_vty.c
M src/gb/libosmogb.map
7 files changed, 68 insertions(+), 28 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/84/21484/1
diff --git a/include/osmocom/gprs/gprs_ns2.h b/include/osmocom/gprs/gprs_ns2.h
index 4575329..ccb1a94 100644
--- a/include/osmocom/gprs/gprs_ns2.h
+++ b/include/osmocom/gprs/gprs_ns2.h
@@ -32,6 +32,13 @@
NS2_VC_MODE_ALIVE,
};
+enum gprs_ns2_dialect {
+ NS2_DIALECT_STATIC_ALIVE,
+ NS2_DIALECT_STATIC_RESETBLOCK,
+ NS2_DIALECT_IPACCESS,
+ NS2_DIALECT_SNS,
+};
+
/*! Osmocom NS link layer types */
enum gprs_ns2_ll {
GPRS_NS2_LL_UDP, /*!< NS/UDP/IP */
@@ -144,7 +151,8 @@
gprs_ns2_foreach_nsvc_cb cb, void *cb_data);
struct gprs_ns2_nse *gprs_ns2_nse_by_nsei(struct gprs_ns2_inst *nsi, uint16_t
nsei);
struct gprs_ns2_nse *gprs_ns2_create_nse(struct gprs_ns2_inst *nsi, uint16_t
nsei,
- enum gprs_ns2_ll linklayer);
+ enum gprs_ns2_ll linklayer,
+ enum gprs_ns2_dialect dialect);
uint16_t gprs_ns2_nse_nsei(struct gprs_ns2_nse *nse);
void gprs_ns2_free_nse(struct gprs_ns2_nse *nse);
void gprs_ns2_free_nses(struct gprs_ns2_inst *nsi);
@@ -160,7 +168,6 @@
struct gprs_ns2_vc_bind **result);
struct gprs_ns2_vc_bind *gprs_ns2_ip_bind_by_sockaddr(struct gprs_ns2_inst
*nsi,
const struct
osmo_sockaddr *sockaddr);
-void gprs_ns2_bind_set_mode(struct gprs_ns2_vc_bind *bind, enum
gprs_ns2_vc_mode mode);
/* FR VL driver */
struct gprs_ns2_vc_bind *gprs_ns2_fr_bind_by_netif(
@@ -188,7 +195,8 @@
struct gprs_ns2_vc *gprs_ns2_ip_connect2(struct gprs_ns2_vc_bind *bind,
const struct osmo_sockaddr *remote,
uint16_t nsei,
- uint16_t nsvci);
+ uint16_t nsvci,
+ enum gprs_ns2_dialect dialect);
struct gprs_ns2_vc *gprs_ns2_ip_connect_inactive(struct gprs_ns2_vc_bind *bind,
const struct osmo_sockaddr *remote,
struct gprs_ns2_nse *nse,
diff --git a/src/gb/gprs_ns2.c b/src/gb/gprs_ns2.c
index 69c1174..a2443ea 100644
--- a/src/gb/gprs_ns2.c
+++ b/src/gb/gprs_ns2.c
@@ -491,7 +491,8 @@
* \param[in] nse The NS Entity on which we operate
* \param[in] initiater - if this is an incoming remote (!initiater) or a
local outgoing connection (initater)
* \return newly allocated NS-VC on success; NULL on error */
-struct gprs_ns2_vc *ns2_vc_alloc(struct gprs_ns2_vc_bind *bind, struct
gprs_ns2_nse *nse, bool initiater)
+struct gprs_ns2_vc *ns2_vc_alloc(struct gprs_ns2_vc_bind *bind, struct
gprs_ns2_nse *nse, bool initiater,
+ enum gprs_ns2_vc_mode vc_mode)
{
struct gprs_ns2_vc *nsvc = talloc_zero(bind, struct gprs_ns2_vc);
@@ -500,7 +501,7 @@
nsvc->bind = bind;
nsvc->nse = nse;
- nsvc->mode = bind->vc_mode;
+ nsvc->mode = vc_mode;
nsvc->sig_weight = 1;
nsvc->data_weight = 1;
@@ -671,7 +672,8 @@
* \param[in] nsi NS instance in which to create NS Entity
* \param[in] nsei NS Entity Identifier of to-be-created NSE
* \returns newly-allocated NS-E in successful case; NULL on error */
-struct gprs_ns2_nse *gprs_ns2_create_nse(struct gprs_ns2_inst *nsi, uint16_t
nsei, enum gprs_ns2_ll linklayer)
+struct gprs_ns2_nse *gprs_ns2_create_nse(struct gprs_ns2_inst *nsi, uint16_t
nsei,
+ enum gprs_ns2_ll linklayer, enum
gprs_ns2_dialect dialect)
{
struct gprs_ns2_nse *nse;
@@ -685,6 +687,7 @@
if (!nse)
return NULL;
+ nse->dialect = dialect;
nse->ll = linklayer;
nse->nsei = nsei;
nse->nsi = nsi;
@@ -764,6 +767,8 @@
struct tlv_parsed tp;
struct gprs_ns2_vc *nsvc;
struct gprs_ns2_nse *nse;
+ enum gprs_ns2_dialect dialect;
+ enum gprs_ns2_vc_mode vc_mode;
uint16_t nsvci;
uint16_t nsei;
@@ -793,8 +798,10 @@
return GPRS_NS2_CS_SKIPPED;
case NS_PDUT_RESET:
/* accept PDU RESET when vc_mode matches */
- if (bind->vc_mode == NS2_VC_MODE_BLOCKRESET)
+ if (bind->accept_ipaccess) {
+ dialect = NS2_DIALECT_IPACCESS;
break;
+ }
rc = reject_status_msg(msg, &tp, reject,
NS_CAUSE_PDU_INCOMP_PSTATE);
if (rc < 0) {
@@ -836,13 +843,14 @@
return GPRS_NS2_CS_SKIPPED;
}
- nse = gprs_ns2_create_nse(bind->nsi, nsei, bind->ll);
+ nse = gprs_ns2_create_nse(bind->nsi, nsei, bind->ll, dialect);
if (!nse) {
return GPRS_NS2_CS_ERROR;
}
}
- nsvc = ns2_vc_alloc(bind, nse, false);
+ vc_mode = gprs_ns2_dialect_to_vc_mode(dialect);
+ nsvc = ns2_vc_alloc(bind, nse, false, vc_mode);
if (!nsvc)
return GPRS_NS2_CS_SKIPPED;
@@ -910,12 +918,13 @@
struct gprs_ns2_vc *gprs_ns2_ip_connect2(struct gprs_ns2_vc_bind *bind,
const struct osmo_sockaddr *remote,
uint16_t nsei,
- uint16_t nsvci)
+ uint16_t nsvci,
+ enum gprs_ns2_dialect dialect)
{
struct gprs_ns2_nse *nse = gprs_ns2_nse_by_nsei(bind->nsi, nsei);
if (!nse) {
- nse = gprs_ns2_create_nse(bind->nsi, nsei, GPRS_NS2_LL_UDP);
+ nse = gprs_ns2_create_nse(bind->nsi, nsei, GPRS_NS2_LL_UDP,
dialect);
if (!nse)
return NULL;
}
@@ -936,7 +945,7 @@
struct gprs_ns2_vc *nsvc;
if (!nse) {
- nse = gprs_ns2_create_nse(bind->nsi, nsei, GPRS_NS2_LL_UDP);
+ nse = gprs_ns2_create_nse(bind->nsi, nsei, GPRS_NS2_LL_UDP,
NS2_DIALECT_SNS);
if (!nse)
return -1;
}
@@ -1195,14 +1204,6 @@
}
}
-/*! Set the mode of given bind.
- * \param[in] bind the bind we want to set the mode of
- * \param[in] mode mode to set bind to */
-void gprs_ns2_bind_set_mode(struct gprs_ns2_vc_bind *bind, enum
gprs_ns2_vc_mode mode)
-{
- bind->vc_mode = mode;
-}
-
/*! Destroy a given bind.
* \param[in] bind the bind we want to destroy */
void gprs_ns2_free_bind(struct gprs_ns2_vc_bind *bind)
@@ -1230,4 +1231,20 @@
gprs_ns2_free_bind(bind);
}
}
+
+enum gprs_ns2_vc_mode gprs_ns2_dialect_to_vc_mode(
+ enum gprs_ns2_dialect dialect)
+{
+ switch (dialect) {
+ case NS2_DIALECT_SNS:
+ case NS2_DIALECT_STATIC_ALIVE:
+ return NS2_VC_MODE_ALIVE;
+ case NS2_DIALECT_STATIC_RESETBLOCK:
+ case NS2_DIALECT_IPACCESS:
+ return NS2_VC_MODE_BLOCKRESET;
+ default:
+ return -1;
+ }
+}
+
/*! @} */
diff --git a/src/gb/gprs_ns2_fr.c b/src/gb/gprs_ns2_fr.c
index 3cf44ef..9327d54 100644
--- a/src/gb/gprs_ns2_fr.c
+++ b/src/gb/gprs_ns2_fr.c
@@ -595,7 +595,7 @@
struct priv_vc *priv = NULL;
struct gprs_ns2_nse *nse = gprs_ns2_nse_by_nsei(bind->nsi, nsei);
if (!nse) {
- nse = gprs_ns2_create_nse(bind->nsi, nsei, GPRS_NS2_LL_FR);
+ nse = gprs_ns2_create_nse(bind->nsi, nsei, GPRS_NS2_LL_FR,
NS2_DIALECT_STATIC_RESETBLOCK);
if (!nse)
return NULL;
created_nse = true;
@@ -606,7 +606,7 @@
goto err_nse;
}
- nsvc = ns2_vc_alloc(bind, nse, true);
+ nsvc = ns2_vc_alloc(bind, nse, true, NS2_VC_MODE_BLOCKRESET);
if (!nsvc)
goto err_nse;
diff --git a/src/gb/gprs_ns2_internal.h b/src/gb/gprs_ns2_internal.h
index e72deff..a8a4321 100644
--- a/src/gb/gprs_ns2_internal.h
+++ b/src/gb/gprs_ns2_internal.h
@@ -130,6 +130,9 @@
/*! which link-layer are we based on? */
enum gprs_ns2_ll ll;
+ /*! which dialect does this NSE speaks? */
+ enum gprs_ns2_dialect dialect;
+
struct osmo_fsm_inst *bss_sns_fi;
};
@@ -188,8 +191,8 @@
struct gprs_ns2_inst *nsi;
struct gprs_ns2_vc_driver *driver;
- /*! if VCs use reset/block/unblock method. IP shall not use this */
- enum gprs_ns2_vc_mode vc_mode;
+ bool accept_ipaccess;
+ bool accept_sns;
/*! which link-layer are we based on? */
enum gprs_ns2_ll ll;
@@ -222,7 +225,8 @@
struct gprs_ns2_vc *ns2_vc_alloc(struct gprs_ns2_vc_bind *bind,
struct gprs_ns2_nse *nse,
- bool initiater);
+ bool initiater,
+ enum gprs_ns2_vc_mode vc_mode);
struct msgb *gprs_ns2_msgb_alloc(void);
@@ -303,3 +307,4 @@
/* nse */
void ns2_nse_notify_unblocked(struct gprs_ns2_vc *nsvc, bool unblocked);
+enum gprs_ns2_vc_mode gprs_ns2_dialect_to_vc_mode(enum gprs_ns2_dialect
dialect);
diff --git a/src/gb/gprs_ns2_udp.c b/src/gb/gprs_ns2_udp.c
index 928116d..a8cca47 100644
--- a/src/gb/gprs_ns2_udp.c
+++ b/src/gb/gprs_ns2_udp.c
@@ -378,8 +378,15 @@
{
struct gprs_ns2_vc *nsvc;
struct priv_vc *priv;
+ enum gprs_ns2_vc_mode vc_mode;
- nsvc = ns2_vc_alloc(bind, nse, true);
+ vc_mode = gprs_ns2_dialect_to_vc_mode(nse->dialect);
+ if (vc_mode == -1) {
+ LOGP(DLNS, LOGL_ERROR, "Can not derive vc mode from dialect.
Maybe libosmocore is too old.\n");
+ return NULL;
+ }
+
+ nsvc = ns2_vc_alloc(bind, nse, true, vc_mode);
if (!nsvc)
return NULL;
diff --git a/src/gb/gprs_ns2_vty.c b/src/gb/gprs_ns2_vty.c
index 8b8a999..1650ba9 100644
--- a/src/gb/gprs_ns2_vty.c
+++ b/src/gb/gprs_ns2_vty.c
@@ -858,6 +858,7 @@
struct gprs_ns2_nse *nse;
struct gprs_ns2_vc *nsvc;
struct osmo_sockaddr sockaddr;
+ enum gprs_ns2_dialect dialect;
int rc = 0;
if (!vty_nsi)
@@ -882,6 +883,7 @@
/* validate settings */
switch (vtyvc->ll) {
case GPRS_NS2_LL_UDP:
+ dialect = NS2_DIALECT_STATIC_ALIVE;
if (strlen(vtyvc->remote.ip) == 0) {
/* Invalid IP for VC */
continue;
@@ -898,14 +900,16 @@
}
break;
case GPRS_NS2_LL_FR:
+ dialect = NS2_DIALECT_STATIC_RESETBLOCK;
break;
case GPRS_NS2_LL_FR_GRE:
+ dialect = NS2_DIALECT_STATIC_RESETBLOCK;
continue;
}
nse = gprs_ns2_nse_by_nsei(vty_nsi, vtyvc->nsei);
if (!nse) {
- nse = gprs_ns2_create_nse(vty_nsi, vtyvc->nsei,
vtyvc->ll);
+ nse = gprs_ns2_create_nse(vty_nsi, vtyvc->nsei,
vtyvc->ll, dialect);
if (!nse) {
/* Could not create NSE for VTY */
continue;
diff --git a/src/gb/libosmogb.map b/src/gb/libosmogb.map
index 2c4e897..d390035 100644
--- a/src/gb/libosmogb.map
+++ b/src/gb/libosmogb.map
@@ -82,7 +82,6 @@
gprs_ns_msgb_alloc;
gprs_ns2_aff_cause_prim_strs;
-gprs_ns2_bind_set_mode;
gprs_ns2_cause_strs;
gprs_ns2_create_nse;
gprs_ns2_dynamic_create_nse;
--
To view, visit https://gerrit.osmocom.org/c/libosmocore/+/21484
To unsubscribe, or for help writing mail filters, visit
https://gerrit.osmocom.org/settings
Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Change-Id: Ia118bb6f994845d84db09de7a94856f5ca573404
Gerrit-Change-Number: 21484
Gerrit-PatchSet: 1
Gerrit-Owner: lynxis lazus <lyn...@fe80.eu>
Gerrit-MessageType: newchange
