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upf_pfcp_api.c
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/*
* Copyright(c) 2018 Travelping GmbH.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <inttypes.h>
#include <errno.h>
#include <math.h>
#include <sys/mman.h>
#include <sys/queue.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <vppinfra/types.h>
#include <vppinfra/vec.h>
#include <vppinfra/format.h>
#include <vppinfra/random.h>
#include <vppinfra/sparse_vec.h>
#include <vnet/fib/ip4_fib.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/ip/ip6_hop_by_hop.h>
#include <vnet/fib/fib_path_list.h>
#include "pfcp.h"
#include "upf.h"
#include "upf_pfcp.h"
#include "upf_pfcp_server.h"
#include "upf_pfcp_api.h"
#include "upf_app_db.h"
#include "upf_ipfilter.h"
#include "upf_ipfix.h"
#include <vlib/unix/plugin.h>
#if CLIB_DEBUG > 1
#define upf_debug clib_warning
#else
#define upf_debug(...) \
do \
{ \
} \
while (0)
#endif
#define API_VERSION 1
#define TRAFFIC_TIMER_PERIOD 60
extern char *vpe_version_string;
typedef struct
{
time_t start_time;
} upf_pfcp_session_t;
/* permit out ip from any to assigned */
static const acl_rule_t wildcard_acl = {
.type = IPFILTER_WILDCARD,
.action = ACL_PERMIT,
.direction = ACL_OUT,
.proto = ~0,
.address = { [UPF_ACL_FIELD_SRC] = ACL_ADDR_ANY,
[UPF_ACL_FIELD_DST] = ACL_ADDR_ASSIGNED },
.port = { [UPF_ACL_FIELD_SRC] = { .min = 0, .max = ~0 },
[UPF_ACL_FIELD_DST] = { .min = 0, .max = ~0 } }
};
size_t
upf_pfcp_api_session_data_size ()
{
return sizeof (upf_pfcp_session_t);
}
void
upf_pfcp_api_session_data_init (void *sxp, time_t start_time)
{
upf_pfcp_session_t *sx = (upf_pfcp_session_t *) sxp;
memset (sx, 0, sizeof (*sx));
sx->start_time = start_time;
}
static void
init_response_node_id (pfcp_ie_node_id_t *node_id)
{
upf_main_t *gtm = &upf_main;
*node_id = gtm->node_id;
if (gtm->node_id.type == PFCP_NID_FQDN)
{
node_id->fqdn = vec_dup (gtm->node_id.fqdn);
}
}
static void
init_response_up_f_seid (pfcp_ie_f_seid_t *up_f_seid, ip46_address_t *address,
bool is_ip4)
{
if (is_ip4)
{
up_f_seid->flags |= PFCP_F_SEID_IP_ADDRESS_V4;
up_f_seid->ip4 = address->ip4;
}
else
{
up_f_seid->flags |= PFCP_F_SEID_IP_ADDRESS_V6;
up_f_seid->ip6 = address->ip6;
}
}
#define tp_error_report(r, fmt, ...) \
init_tp_error_report (r, __FILE__, __LINE__, fmt, ##__VA_ARGS__);
#define tp_session_error_report(r, fmt, ...) \
do \
{ \
UPF_SET_BIT ((r)->grp.fields, \
SESSION_PROCEDURE_RESPONSE_TP_ERROR_REPORT); \
tp_error_report (&(r)->tp_error_report, (fmt), ##__VA_ARGS__); \
} \
while (0)
void
init_tp_error_report (pfcp_ie_tp_error_report_t *report, const char *file,
int line, char *fmt, ...)
{
#if CLIB_DEBUG > 1
const char *p;
#endif
va_list va;
UPF_SET_BIT (report->grp.fields, TP_ERROR_REPORT_TP_ERROR_MESSAGE);
va_start (va, fmt);
report->error_message = va_format (0, fmt, &va);
va_end (va);
#if CLIB_DEBUG > 1
UPF_SET_BIT (report->grp.fields, TP_ERROR_REPORT_TP_FILE_NAME);
UPF_SET_BIT (report->grp.fields, TP_ERROR_REPORT_TP_LINE_NUMBER);
if ((p = strrchr (file, '/')) != NULL)
{
p++;
}
else
p = file;
vec_add (report->file_name, p, strlen (p));
report->line_number = line;
clib_warning ("%s:%u PFCP error: %v.\n", p, line, report->error_message);
#endif
}
/*************************************************************************/
/* message helpers */
static void
build_ue_ip_address_information (
pfcp_ie_ue_ip_address_pool_information_t **ue_pool_info)
{
upf_main_t *gtm = &upf_main;
upf_nat_pool_t *np;
upf_ue_ip_pool_info_t *ue_p;
vec_alloc (*ue_pool_info, pool_elts (gtm->ueip_pools));
pool_foreach (ue_p, gtm->ueip_pools)
{
pfcp_ie_ue_ip_address_pool_information_t *ueif;
vec_add2 (*ue_pool_info, ueif, 1);
ueif->ue_ip_address_pool_identity = vec_dup (ue_p->identity);
UPF_SET_BIT (ueif->grp.fields,
UE_IP_ADDRESS_POOL_INFORMATION_POOL_IDENTIFY);
ueif->network_instance = vec_dup (ue_p->nwi_name);
UPF_SET_BIT (ueif->grp.fields,
UE_IP_ADDRESS_POOL_INFORMATION_NETWORK_INSTANCE);
pool_foreach (np, gtm->nat_pools)
{
if (!(vec_is_equal (np->network_instance, ue_p->nwi_name)))
continue;
pfcp_ie_bbf_nat_port_block_t *block;
vec_add2 (ueif->port_blocks, block, 1);
*block = vec_dup (np->name);
UPF_SET_BIT (ueif->grp.fields,
UE_IP_ADDRESS_POOL_INFORMATION_BBF_NAT_PORT_BLOCK);
}
}
}
static void
build_user_plane_ip_resource_information (
pfcp_ie_user_plane_ip_resource_information_t **upip)
{
upf_main_t *gtm = &upf_main;
upf_upip_res_t *res;
vec_alloc (*upip, pool_elts (gtm->upip_res));
pool_foreach (res, gtm->upip_res)
{
pfcp_ie_user_plane_ip_resource_information_t *r;
vec_add2 (*upip, r, 1);
if (res->nwi_index != ~0)
{
upf_nwi_t *nwi = pool_elt_at_index (gtm->nwis, res->nwi_index);
r->flags |= PFCP_USER_PLANE_IP_RESOURCE_INFORMATION_ASSONI;
r->network_instance = vec_dup (nwi->name);
}
if (INTF_INVALID != res->intf)
{
r->flags |= PFCP_USER_PLANE_IP_RESOURCE_INFORMATION_ASSOSI;
r->source_intf = res->intf;
}
if (res->mask != 0)
{
r->teid_range_indication = __builtin_popcount (res->mask);
r->teid_range = (res->teid >> 24);
}
if (!is_zero_ip4_address (&res->ip4))
{
r->flags |= PFCP_USER_PLANE_IP_RESOURCE_INFORMATION_V4;
r->ip4 = res->ip4;
}
if (!is_zero_ip6_address (&res->ip6))
{
r->flags |= PFCP_USER_PLANE_IP_RESOURCE_INFORMATION_V6;
r->ip6 = res->ip6;
}
}
}
/* message handlers */
static int
handle_heartbeat_request (pfcp_msg_t *msg, pfcp_decoded_msg_t *dmsg)
{
pfcp_server_main_t *psm = &pfcp_server_main;
pfcp_decoded_msg_t resp_dmsg = { .type = PFCP_MSG_HEARTBEAT_RESPONSE };
pfcp_simple_response_t *resp = &resp_dmsg.simple_response;
memset (resp, 0, sizeof (*resp));
UPF_SET_BIT (resp->grp.fields, PFCP_RESPONSE_RECOVERY_TIME_STAMP);
resp->response.recovery_time_stamp = psm->start_time;
upf_debug ("PFCP: start_time: %p, %d, %x.", &psm, psm->start_time,
psm->start_time);
upf_pfcp_send_response (msg, &resp_dmsg);
return 0;
}
static int
handle_heartbeat_response (pfcp_msg_t *msg, pfcp_decoded_msg_t *dmsg)
{
upf_main_t *gtm = &upf_main;
pfcp_server_main_t *psm = &pfcp_server_main;
upf_node_assoc_t *n;
pfcp_ie_recovery_time_stamp_t ts =
dmsg->simple_response.response.recovery_time_stamp;
if (msg->node == ~0 || pool_is_free_index (gtm->nodes, msg->node))
return -1;
n = pool_elt_at_index (gtm->nodes, msg->node);
if (ts > n->recovery_time_stamp)
pfcp_release_association (n);
else if (ts < n->recovery_time_stamp)
{
/* 3GPP TS 23.007, Sect. 19A:
*
* If the value of a Recovery Time Stamp previously stored for a peer is
* larger than the Recovery Time Stamp value received in the Heartbeat
* Response message or the PFCP message, this indicates a possible race
* condition (newer message arriving before the older one). The received
* PFCP node related message and the received new Recovery Time Stamp
* value shall be discarded and an error may be logged.
*/
return -1;
}
else
{
upf_debug ("restarting HB timer\n");
n->heartbeat_handle = upf_pfcp_server_start_timer (
PFCP_SERVER_HB_TIMER, n - gtm->nodes, psm->hb_cfg.timeout);
}
return 0;
}
static int
handle_pfd_management_request (pfcp_msg_t *msg, pfcp_decoded_msg_t *dmsg)
{
return -1;
}
static int
handle_pfd_management_response (pfcp_msg_t *msg, pfcp_decoded_msg_t *dmsg)
{
return -1;
}
static int
handle_association_setup_request (pfcp_msg_t *msg, pfcp_decoded_msg_t *dmsg)
{
pfcp_server_main_t *psm = &pfcp_server_main;
upf_main_t *gtm = &upf_main;
pfcp_msg_association_setup_request_t *req = &dmsg->association_setup_request;
pfcp_decoded_msg_t resp_dmsg = { .type =
PFCP_MSG_ASSOCIATION_SETUP_RESPONSE };
pfcp_msg_association_procedure_response_t *resp =
&resp_dmsg.association_setup_response;
upf_node_assoc_t *n;
int r = 0;
memset (resp, 0, sizeof (*resp));
UPF_SET_BIT (resp->grp.fields, ASSOCIATION_PROCEDURE_RESPONSE_CAUSE);
resp->cause = PFCP_CAUSE_REQUEST_REJECTED;
UPF_SET_BIT (resp->grp.fields, ASSOCIATION_PROCEDURE_RESPONSE_NODE_ID);
init_response_node_id (&resp->node_id);
UPF_SET_BIT (resp->grp.fields,
ASSOCIATION_PROCEDURE_RESPONSE_RECOVERY_TIME_STAMP);
resp->recovery_time_stamp = psm->start_time;
UPF_SET_BIT (resp->grp.fields, ASSOCIATION_PROCEDURE_RESPONSE_TP_BUILD_ID);
vec_add (resp->tp_build_id, vpe_version_string, strlen (vpe_version_string));
n = pfcp_get_association (&req->request.node_id);
if (n)
{
/* 3GPP TS 23.007, Sect. 19A:
*
* A PFCP function that receives a PFCP Association Setup Request
* shall proceed with:
*
* - establishing the PFCP association and
* - deleting the existing PFCP association and associated PFCP sessions,
* if a PFCP association was already established for the Node ID
* received in the request, regardless of the Recovery Timestamp received
* in the request.
*
* A PFCP function shall ignore the Recovery Timestamp received in
* PFCP Association Setup Response message.
*
*/
pfcp_release_association (n);
}
n = pfcp_new_association (msg->session_handle, &msg->lcl.address,
&msg->rmt.address, &req->request.node_id);
n->recovery_time_stamp = req->recovery_time_stamp;
if (ISSET_BIT (req->grp.fields, ASSOCIATION_SETUP_REQUEST_SMF_SET_ID))
pfcp_node_enter_smf_set (n, req->smf_set_id.fqdn);
UPF_SET_BIT (resp->grp.fields,
ASSOCIATION_PROCEDURE_RESPONSE_UP_FUNCTION_FEATURES);
resp->up_function_features |= PFCP_F_UPFF_EMPU;
resp->up_function_features |= PFCP_F_UPFF_MPAS;
if (gtm->pfcp_spec_version >= 16)
{
resp->up_function_features |= PFCP_F_UPFF_VTIME;
resp->up_function_features |= PFCP_F_UPFF_FTUP;
build_ue_ip_address_information (&resp->ue_ip_address_pool_information);
if (vec_len (resp->ue_ip_address_pool_information) != 0)
UPF_SET_BIT (
resp->grp.fields,
ASSOCIATION_PROCEDURE_RESPONSE_UE_IP_ADDRESS_POOL_INFORMATION);
UPF_SET_BIT (resp->grp.fields,
ASSOCIATION_PROCEDURE_RESPONSE_BBF_UP_FUNCTION_FEATURES);
resp->bbf_up_function_features |= PFCP_BBF_UP_NAT;
}
else
{
build_user_plane_ip_resource_information (
&resp->user_plane_ip_resource_information);
if (vec_len (resp->user_plane_ip_resource_information) != 0)
UPF_SET_BIT (
resp->grp.fields,
ASSOCIATION_PROCEDURE_RESPONSE_USER_PLANE_IP_RESOURCE_INFORMATION);
}
if (r == 0)
{
n->heartbeat_handle = upf_pfcp_server_start_timer (
PFCP_SERVER_HB_TIMER, n - gtm->nodes, psm->hb_cfg.timeout);
resp->cause = PFCP_CAUSE_REQUEST_ACCEPTED;
}
upf_pfcp_send_response (msg, &resp_dmsg);
return r;
}
static int
handle_association_setup_response (pfcp_msg_t *msg, pfcp_decoded_msg_t *dmsg)
{
return -1;
}
static int
handle_association_update_request (pfcp_msg_t *msg, pfcp_decoded_msg_t *dmsg)
{
return -1;
}
static int
handle_association_update_response (pfcp_msg_t *msg, pfcp_decoded_msg_t *dmsg)
{
return -1;
}
static int
handle_association_release_request (pfcp_msg_t *msg, pfcp_decoded_msg_t *dmsg)
{
return -1;
}
static int
handle_association_release_response (pfcp_msg_t *msg, pfcp_decoded_msg_t *dmsg)
{
return -1;
}
#if 0
static int
handle_version_not_supported_response (pfcp_msg_t * msg,
pfcp_decoded_msg_t * dmsg)
{
return -1;
}
#endif
static int
handle_node_report_request (pfcp_msg_t *msg, pfcp_decoded_msg_t *dmsg)
{
return -1;
}
static int
handle_node_report_response (pfcp_msg_t *msg, pfcp_decoded_msg_t *dmsg)
{
return -1;
}
/* this methods used for cases when incoming message decode is failed */
static void
send_simple_response (pfcp_msg_t *req, u8 type, pfcp_ie_cause_t cause,
pfcp_ie_offending_ie_t *err)
{
pfcp_server_main_t *psm = &pfcp_server_main;
pfcp_decoded_msg_t resp_dmsg = {
.type = type,
};
pfcp_simple_response_t *resp = &resp_dmsg.simple_response;
memset (resp, 0, sizeof (*resp));
UPF_SET_BIT (resp->grp.fields, PFCP_RESPONSE_CAUSE);
resp->response.cause = cause;
switch (type)
{
case PFCP_MSG_HEARTBEAT_RESPONSE:
case PFCP_MSG_PFD_MANAGEMENT_RESPONSE:
case PFCP_MSG_SESSION_MODIFICATION_RESPONSE:
case PFCP_MSG_SESSION_DELETION_RESPONSE:
case PFCP_MSG_SESSION_REPORT_RESPONSE:
break;
default:
UPF_SET_BIT (resp->grp.fields, PFCP_RESPONSE_NODE_ID);
init_response_node_id (&resp->response.node_id);
break;
}
switch (type)
{
case PFCP_MSG_HEARTBEAT_RESPONSE:
case PFCP_MSG_ASSOCIATION_SETUP_RESPONSE:
UPF_SET_BIT (resp->grp.fields, PFCP_RESPONSE_RECOVERY_TIME_STAMP);
resp->response.recovery_time_stamp = psm->start_time;
break;
default:
break;
}
if (vec_len (err) != 0)
{
UPF_SET_BIT (resp->grp.fields, PFCP_RESPONSE_OFFENDING_IE);
resp->response.offending_ie = err[0];
}
upf_pfcp_send_response (req, &resp_dmsg);
}
#define OPT(MSG, FIELD, VALUE, DEFAULT) \
((ISSET_BIT ((MSG)->grp.fields, (FIELD))) ? MSG->VALUE : (DEFAULT))
static upf_nwi_t *
lookup_nwi (u8 *name)
{
upf_main_t *gtm = &upf_main;
uword *p;
assert (name);
if (pool_elts (gtm->nwis) == 0)
return NULL;
p = hash_get_mem (gtm->nwi_index_by_name, name);
if (!p)
return NULL;
return pool_elt_at_index (gtm->nwis, p[0]);
}
static bool
validate_teid (u32 teid)
{
return ((teid != 0) && (teid != 0xffffffff));
}
static u32
teid_v4_lookup_session_index (upf_main_t *gtm, u32 teid, ip4_address_t *ip4)
{
clib_bihash_kv_8_8_t kv, value;
gtpu4_tunnel_key_t key4;
key4.dst = ip4->as_u32;
key4.teid = teid;
kv.key = key4.as_u64;
if (PREDICT_FALSE (
clib_bihash_search_8_8 (>m->v4_tunnel_by_key, &kv, &value)))
return ~0;
/* only lower 32 bits are used here */
return value.value;
}
static u32
teid_v6_lookup_session_index (upf_main_t *gtm, u32 teid, ip6_address_t *ip6)
{
clib_bihash_kv_24_8_t kv, value;
kv.key[0] = ip6->as_u64[0];
kv.key[1] = ip6->as_u64[1];
kv.key[2] = teid;
if (PREDICT_FALSE (
clib_bihash_search_24_8 (>m->v6_tunnel_by_key, &kv, &value)))
return ~0;
/* only lower 32 bits are used here */
return value.value;
}
static u32
process_teid_generation (upf_main_t *gtm, u8 chid, u32 flags,
upf_upip_res_t *res, upf_session_t *sx)
{
u8 retry_cnt = 10;
u32 teid = 0;
bool ok = false;
do
{
teid = random_u32 (>m->rand_base) & ~res->mask;
if (!validate_teid (teid))
{
retry_cnt--;
continue;
}
gtm->rand_base = teid;
/* teid_v4/v6_lookup can be called even there is no ip4/ip6 address
present in a UPIP res. It will always return
UPF_GTPU_ERROR_NO_SUCH_TUNNEL for such cases
*/
ok = (!(flags & PFCP_F_TEID_V4) ||
teid_v4_lookup_session_index (gtm, teid, &res->ip4) == ~0) &&
(!(flags & PFCP_F_TEID_V6) ||
teid_v6_lookup_session_index (gtm, teid, &res->ip6) == ~0);
if (ok)
break;
}
while (retry_cnt > 0);
if (!ok)
/* can't generate unique for given UPIP resource */
return 0;
if ((flags & PFCP_F_TEID_CHID))
{
u32 *n = sparse_vec_validate (sx->teid_by_chid, chid);
n[0] = teid;
}
return teid;
}
static int
handle_f_teid (upf_session_t *sx, upf_main_t *gtm, pfcp_ie_pdi_t *pdi,
upf_pdr_t *process_pdr, pfcp_ie_created_pdr_t **created_pdr_vec,
upf_upip_res_t *res, u8 create)
{
pfcp_ie_created_pdr_t *created_pdr;
u32 teid = 0;
u32 sidx = ~0;
process_pdr->pdi.fields |= F_PDI_LOCAL_F_TEID;
// We only generate F_TEID if NWI is defined
if ((pdi->f_teid.flags & PFCP_F_TEID_CH))
{
if (!res)
return -1;
if ((pdi->f_teid.flags & PFCP_F_TEID_CHID))
{
uword i = sparse_vec_index (sx->teid_by_chid, pdi->f_teid.choose_id);
if (i)
teid = vec_elt (sx->teid_by_chid, i);
}
if (!teid)
{
if (!create)
return -1;
teid = process_teid_generation (gtm, pdi->f_teid.choose_id,
pdi->f_teid.flags, res, sx);
if (!teid)
return -1;
}
process_pdr->pdi.teid.teid = teid;
if ((!is_zero_ip4_address (&res->ip4)) &&
(pdi->f_teid.flags & PFCP_F_TEID_V4))
{
process_pdr->pdi.teid.ip4 = res->ip4;
process_pdr->pdi.teid.flags |= PFCP_F_TEID_V4;
}
if ((!is_zero_ip6_address (&res->ip6)) &&
(pdi->f_teid.flags & PFCP_F_TEID_V6))
{
process_pdr->pdi.teid.flags |= PFCP_F_TEID_V6;
process_pdr->pdi.teid.ip6 = res->ip6;
}
if (create)
{
vec_add2 (*created_pdr_vec, created_pdr, 1);
memset (created_pdr, 0, sizeof (*created_pdr));
UPF_SET_BIT (created_pdr->grp.fields, CREATED_PDR_PDR_ID);
UPF_SET_BIT (created_pdr->grp.fields, CREATED_PDR_F_TEID);
created_pdr->pdr_id = process_pdr->id;
created_pdr->f_teid = process_pdr->pdi.teid;
}
}
else
{
/* CH == 0, check for conflicts with other sessions */
if (pdi->f_teid.flags & PFCP_F_TEID_V4)
sidx = teid_v4_lookup_session_index (gtm, pdi->f_teid.teid,
&pdi->f_teid.ip4);
else if (pdi->f_teid.flags & PFCP_F_TEID_V6)
sidx = teid_v6_lookup_session_index (gtm, pdi->f_teid.teid,
&pdi->f_teid.ip6);
if (sidx != ~0 && sidx != sx - gtm->sessions)
return -1;
process_pdr->pdi.teid = pdi->f_teid;
}
return 0;
}
/*
* Delete session that conflicts on UE IP if it resides
* on the same CP node as the new one.
*/
static void
purge_conflicting_session (upf_session_t *sx_old, upf_session_t *sx_new,
pfcp_ie_ue_ip_address_t *ue_addr)
{
if (sx_old->assoc.node != sx_new->assoc.node)
return;
clib_warning ("UE IP conflict: deleting session CP SEID=0x%016" PRIx64 " %U "
"due to attempt to create CP SEID=0x%0x16" PRIx64,
sx_old->cp_seid, format_pfcp_ie_ue_ip_address, ue_addr,
sx_new->cp_seid);
upf_pfcp_session_up_deletion_report (sx_old);
pfcp_disable_session (sx_old);
pfcp_free_session (sx_old);
}
static int
resolve_ue_ip_conflicts (upf_session_t *sx, upf_nwi_t *nwi,
pfcp_ie_ue_ip_address_t *ue_addr)
{
upf_main_t *gtm = &upf_main;
const dpo_id_t *dpo;
int r = 0;
if (ue_addr->flags & PFCP_UE_IP_ADDRESS_V4)
{
dpo = upf_get_session_dpo_ip4 (nwi, &ue_addr->ip4);
if (dpo && dpo->dpoi_index != sx - gtm->sessions)
{
purge_conflicting_session (gtm->sessions + dpo->dpoi_index, sx,
ue_addr);
r = -1;
}
}
if (ue_addr->flags & PFCP_UE_IP_ADDRESS_V6)
{
dpo = upf_get_session_dpo_ip6 (nwi, &ue_addr->ip6);
if (dpo && dpo->dpoi_index != sx - gtm->sessions)
{
purge_conflicting_session (gtm->sessions + dpo->dpoi_index, sx,
ue_addr);
r = -1;
}
}
return r;
}
#define pdr_error(r, pdr, fmt, ...) \
do \
{ \
tp_session_error_report ((r), "PDR ID %u, " fmt, (pdr)->pdr_id, \
##__VA_ARGS__); \
response->failed_rule_id.id = pdr->pdr_id; \
} \
while (0)
upf_nat_addr_t *
get_nat_addr (upf_nat_pool_t *np)
{
upf_nat_addr_t *this_addr = NULL, *addr = NULL;
u32 least_locked_ports = ~0;
vec_foreach (this_addr, np->addresses)
{
if ((this_addr->used_blocks < least_locked_ports) &&
(this_addr->used_blocks < np->max_blocks_per_addr))
{
least_locked_ports = this_addr->used_blocks;
addr = this_addr;
}
}
return addr;
}
int
upf_alloc_and_assign_nat_binding (
upf_nat_pool_t *np, upf_nat_addr_t *addr, ip4_address_t user_ip,
upf_session_t *sx, pfcp_ie_tp_created_binding_t *created_binding)
{
u16 port_start, port_end;
u16 (*upf_nat_create_binding) (ip4_address_t user_addr,
ip4_address_t ext_addr, u16 min_port,
u16 block_size);
upf_nat_create_binding =
vlib_get_plugin_symbol ("nat_plugin.so", "nat_ed_create_binding");
port_start = upf_nat_create_binding (user_ip, addr->ext_addr, np->min_port,
np->port_block_size);
if (port_start)
{
port_end = port_start + np->port_block_size - 1;
addr->used_blocks += 1;
sx->nat_addr = addr;
created_binding->block = vec_dup (np->name);
created_binding->outside_addr.as_u32 = addr->ext_addr.as_u32;
created_binding->port_range.start_port = port_start;
created_binding->port_range.end_port = port_end;
UPF_SET_BIT (created_binding->grp.fields,
TP_CREATED_BINDING_NAT_PORT_BLOCK);
UPF_SET_BIT (created_binding->grp.fields,
TP_CREATED_BINDING_NAT_OUTSIDE_ADDRESS);
UPF_SET_BIT (created_binding->grp.fields,
TP_CREATED_BINDING_NAT_EXTERNAL_PORT_RANGE);
return 0;
}
return 1;
}
static int
handle_create_pdr (upf_session_t *sx, pfcp_ie_create_pdr_t *create_pdr,
pfcp_msg_session_procedure_response_t *response)
{
upf_main_t *gtm = &upf_main;
pfcp_ie_create_pdr_t *pdr;
struct rules *rules;
if (pfcp_make_pending_pdr (sx) != 0)
{
tp_session_error_report (response, "no resources available");
response->cause = PFCP_CAUSE_NO_RESOURCES_AVAILABLE;
return -1;
}
rules = pfcp_get_rules (sx, PFCP_PENDING);
vec_alloc (rules->pdr, vec_len (create_pdr));
vec_foreach (pdr, create_pdr)
{
upf_upip_res_t *res, *ip_res = NULL;
upf_pdr_t *create;
upf_nwi_t *nwi = NULL;
vec_add2 (rules->pdr, create, 1);
memset (create, 0, sizeof (*create));
create->pdi.nwi_index = ~0;
create->pdi.adr.application_id = ~0;
create->pdi.adr.db_id = ~0;
create->id = pdr->pdr_id;
create->precedence = pdr->precedence;
if (ISSET_BIT (pdr->pdi.grp.fields, PDI_NETWORK_INSTANCE))
{
nwi = lookup_nwi (pdr->pdi.network_instance);
if (!nwi)
{
pdr_error (response, pdr, "unknown Network Instance");
goto out_error;
}
create->pdi.nwi_index = nwi - gtm->nwis;
}
pool_foreach (ip_res, gtm->upip_res)
{
if (ip_res->nwi_index == create->pdi.nwi_index)
{
res = ip_res;
break;
}
}
create->pdi.src_intf = pdr->pdi.source_interface;
if (ISSET_BIT (pdr->pdi.grp.fields, PDI_F_TEID))
{
if (handle_f_teid (sx, gtm, &pdr->pdi, create,
&response->created_pdr, res, 1) != 0)
{
pdr_error (response, pdr, "can't handle F-TEID");
goto out_error;
}
/* TODO validate TEID and mask
if (nwi->teid != (pdr->pdi.f_teid.teid & nwi->mask))
{
upf_debug("PDR: %d, TEID not within configure partition\n",
pdr->pdr_id); failed_rule_id->id = pdr->pdr_id; r = -1; vec_pop
(rules->pdr); break;
}
*/
}
if (ISSET_BIT (pdr->pdi.grp.fields, PDI_UE_IP_ADDRESS))
{
create->pdi.fields |= F_PDI_UE_IP_ADDR;
create->pdi.ue_addr = pdr->pdi.ue_ip_address;
if (create->pdi.ue_addr.flags & PFCP_UE_IP_ADDRESS_V4)
sx->user_addr.as_u32 = create->pdi.ue_addr.ip4.as_u32;
if (!ISSET_BIT (pdr->pdi.grp.fields, PDI_SDF_FILTER) &&
!ISSET_BIT (pdr->pdi.grp.fields, PDI_APPLICATION_ID))
{
/* neither SDF, nor Application Id, generate a wildcard
ACL to make ACL scanning simpler */
create->pdi.fields |= F_PDI_SDF_FILTER;
vec_add1 (create->pdi.acl, wildcard_acl);
}
}
if (ISSET_BIT (pdr->pdi.grp.fields, PDI_SDF_FILTER))
{
pfcp_ie_sdf_filter_t *sdf;
create->pdi.fields |= F_PDI_SDF_FILTER;
vec_alloc (create->pdi.acl, _vec_len (pdr->pdi.sdf_filter));
vec_foreach (sdf, pdr->pdi.sdf_filter)
{
unformat_input_t input;
acl_rule_t *acl;
unformat_init_string (&input, (char *) sdf->flow,
vec_len (sdf->flow));
vec_add2 (create->pdi.acl, acl, 1);
if (!unformat (&input, "%U", unformat_ipfilter, acl))
{
unformat_free (&input);
pdr_error (response, pdr, "failed to parse SDF");
goto out_error;
}
unformat_free (&input);
}
}
if (ISSET_BIT (pdr->pdi.grp.fields, PDI_APPLICATION_ID))
{
upf_adf_app_t *app;
uword *p = NULL;
create->pdi.fields |= F_PDI_APPLICATION_ID;
p = hash_get_mem (gtm->upf_app_by_name, pdr->pdi.application_id);
if (!p)
{
pdr_error (response, pdr, "unknown Application ID");
goto out_error;
}
ASSERT (!pool_is_free_index (gtm->upf_apps, p[0]));
app = pool_elt_at_index (gtm->upf_apps, p[0]);
create->pdi.adr.application_id = p[0];
create->pdi.adr.db_id = upf_adf_get_adr_db (p[0]);
create->pdi.adr.flags = app->flags;
if (!ISSET_BIT (pdr->pdi.grp.fields, PDI_SDF_FILTER) &&
(create->pdi.adr.flags & UPF_ADR_IP_RULES))
{
create->pdi.fields |= F_PDI_SDF_FILTER;
vec_add1 (create->pdi.acl, wildcard_acl);
}
upf_debug ("app: %v, ADR DB id %u", app->name,
create->pdi.adr.db_id);
}
create->outer_header_removal =
OPT (pdr, CREATE_PDR_OUTER_HEADER_REMOVAL, outer_header_removal, ~0);
create->far_id = OPT (pdr, CREATE_PDR_FAR_ID, far_id, ~0);
if (ISSET_BIT (pdr->grp.fields, CREATE_PDR_URR_ID))
{
pfcp_ie_urr_id_t *urr_id;
vec_alloc (create->urr_ids, _vec_len (pdr->urr_id));
vec_foreach (urr_id, pdr->urr_id)
{
vec_add1 (create->urr_ids, *urr_id);
}
}