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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* 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.
*/
/**
* \file modules/hicn_plugin/listener.c
* \brief Implementation of listener object VFT for hicn_plugin.
*/
#include <hicn/util/vector.h>
#include "base.h"
#include "listener.h"
struct listener_data_s {
hc_listener_t listener;
hc_data_t *data;
};
/**
* This is a callback used to append in callback_ctx which is a hc_data_t
* designed to hold hc_listener_t, a list of listener, each corresponding to an
* IP address (v4 then v6) of the interfaces, and thus build a list of hICN
* listeners.
*/
static vapi_error_e process_ip_info(struct vapi_ctx_s *ctx, void *callback_ctx,
vapi_error_e rv, bool is_last,
vapi_payload_ip_address_details *reply) {
if (reply == NULL || rv != VAPI_OK) return rv;
if (reply && is_last) printf("COUCOU\n");
if (is_last) return 0;
struct listener_data_s *ld = (struct listener_data_s *)callback_ctx;
if (reply->prefix.address.af == ADDRESS_IP4) {
memcpy(&(ld->listener.local_addr.v4), reply->prefix.address.un.ip4,
IPV4_ADDR_LEN);
ld->listener.family = AF_INET;
} else {
memcpy(&(ld->listener.local_addr.v6), reply->prefix.address.un.ip6,
IPV6_ADDR_LEN);
ld->listener.family = AF_INET6;
}
ld->listener.local_port = 0;
ld->listener.id = reply->sw_if_index;
hc_data_t *data = ld->data;
hc_listener_t *listener = &ld->listener;
hc_data_push(data, listener);
return rv;
}
/* LISTENER LIST */
typedef struct {
u32 swif;
char interface_name[INTERFACE_LEN];
} hc_vapi_interface_t;
/*
* A pointer to hc_data_t is passed in the callback context
* Objective is to store a vector of hc_vapi_interface_t inside
*/
static vapi_error_e on_listener_list_complete_cb(
struct vapi_ctx_s *ctx, void *callback_ctx, vapi_error_e rv, bool is_last,
vapi_payload_sw_interface_details *reply) {
if (reply == NULL || rv != VAPI_OK) return rv;
if (is_last) return 0;
hc_vapi_interface_t **vpp_interfaces_vec =
(hc_vapi_interface_t **)callback_ctx;
hc_vapi_interface_t interface = {.swif = reply->sw_if_index};
// XXX bug
memcpy(interface.interface_name, reply->interface_name, INTERFACE_LEN);
vector_push(*vpp_interfaces_vec, interface);
return rv;
}
static int _vpp_listener_list(hc_sock_t *sock, hc_data_t *data) {
hc_sock_vpp_data_t *s = (hc_sock_vpp_data_t *)sock->data;
int retval = -1; // VAPI_OK;
hc_vapi_interface_t *vpp_interfaces_vec = NULL;
vector_init(vpp_interfaces_vec, 0, 0);
vapi_lock();
vapi_msg_sw_interface_dump *msg =
vapi_alloc_sw_interface_dump(s->g_vapi_ctx_instance);
if (!msg) {
retval = VAPI_ENOMEM;
goto ERR_MSG;
}
msg->payload.sw_if_index = ~0;
msg->payload.name_filter_valid = 0;
/* Retrieve the list of interfaces in vpp_interfaces_vec */
int ret =
vapi_sw_interface_dump(s->g_vapi_ctx_instance, msg,
on_listener_list_complete_cb, &vpp_interfaces_vec);
if (ret != VAPI_OK) goto ERR_LIST_INTERFACES;
/* Query the forwarder for each interface */
// stored in data->buffer == hc_vapi_interface_t* []
// 2 calls for each interface
//
// This function is called twice for each interface, to get resp. the v4 and
// v6 IP addresses associated to it:
// ip_address_dump(sw_if_index, is_ipv6)
//
// Function call :
// vapi_msg_XXX *msg = vapi_alloc_XXX(s->g_vapi_ctx_instance);
// msg->payload.ATTR = VALUE;
// [...]
// int ret = vapi_XXX((s->g_vapi_ctx_instance, msg, CALLBACK, USER_DATA);
//
// CALLBACK = process_ip_info
// USER_DATA = data2
//
// We can assume the callbacks are executed before the function returns, and
// that there is no async code.
//
int rc;
hc_vapi_interface_t *interface;
vapi_msg_ip_address_dump *msg2;
struct listener_data_s ld;
vector_foreach(vpp_interfaces_vec, interface, {
memset(&ld, 0, sizeof(struct listener_data_s));
ld.listener.type = FACE_TYPE_HICN;
rc = snprintf(ld.listener.interface_name, INTERFACE_LEN, "%s",
interface->interface_name);
if (rc < 0 || rc >= INTERFACE_LEN) goto ERR_FOREACH;
ld.data = data;
for (unsigned i = 0; i < 2; i++) {
msg2 = vapi_alloc_ip_address_dump(s->g_vapi_ctx_instance);
msg2->payload.sw_if_index = interface->swif;
msg2->payload.is_ipv6 = i;
retval = vapi_ip_address_dump(s->g_vapi_ctx_instance, msg2,
process_ip_info, &ld);
if (ret != VAPI_OK) goto ERR_GET_IP;
}
});
retval = 0;
ERR_GET_IP:
ERR_FOREACH:
vector_free(vpp_interfaces_vec);
ERR_LIST_INTERFACES:
ERR_MSG:
vapi_unlock();
return retval;
}
#define vpp_listener_create NULL
#define vpp_listener_delete NULL
static int vpp_listener_list(hc_sock_t *sock, hc_object_t *object,
hc_data_t *data) {
assert(!object || hc_object_is_empty(object));
return _vpp_listener_list(sock, data);
}
static int vpp_listener_set(hc_sock_t *sock, hc_object_t *object,
hc_data_t *data) {
return -1;
}
DECLARE_VPP_MODULE_OBJECT_OPS(vpp, listener);
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