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managed_components/espressif__mdns/mdns_networking_lwip.c
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/*
* SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
/*
* MDNS Server Networking
*
*/
#include <string.h>
#include "esp_log.h"
#include "lwip/ip_addr.h"
#include "lwip/pbuf.h"
#include "lwip/igmp.h"
#include "lwip/udp.h"
#include "lwip/mld6.h"
#include "lwip/priv/tcpip_priv.h"
#include "esp_system.h"
#include "esp_event.h"
#include "mdns_networking.h"
#include "esp_netif_net_stack.h"
#include "mdns_mem_caps.h"
/*
* MDNS Server Networking
*
*/
enum interface_protocol {
PROTO_IPV4 = 1 << MDNS_IP_PROTOCOL_V4,
PROTO_IPV6 = 1 << MDNS_IP_PROTOCOL_V6
};
typedef struct interfaces {
bool ready;
int proto;
} interfaces_t;
static interfaces_t s_interfaces[MDNS_MAX_INTERFACES];
static struct udp_pcb *_pcb_main = NULL;
static const char *TAG = "mdns_networking";
static void _udp_recv(void *arg, struct udp_pcb *upcb, struct pbuf *pb, const ip_addr_t *raddr, uint16_t rport);
/**
* @brief Low level UDP PCB Initialize
*/
static esp_err_t _udp_pcb_main_init(void)
{
if (_pcb_main) {
return ESP_OK;
}
_pcb_main = udp_new();
if (!_pcb_main) {
return ESP_ERR_NO_MEM;
}
if (udp_bind(_pcb_main, IP_ANY_TYPE, MDNS_SERVICE_PORT) != 0) {
udp_remove(_pcb_main);
_pcb_main = NULL;
return ESP_ERR_INVALID_STATE;
}
_pcb_main->mcast_ttl = 255;
_pcb_main->remote_port = MDNS_SERVICE_PORT;
ip_addr_copy(_pcb_main->remote_ip, *(IP_ANY_TYPE));
udp_recv(_pcb_main, &_udp_recv, NULL);
return ESP_OK;
}
/**
* @brief Low level UDP PCB Free
*/
static void _udp_pcb_main_deinit(void)
{
if (_pcb_main) {
udp_recv(_pcb_main, NULL, NULL);
udp_disconnect(_pcb_main);
udp_remove(_pcb_main);
_pcb_main = NULL;
}
}
/**
* @brief Low level UDP Multicast membership control
*/
static esp_err_t _udp_join_group(mdns_if_t if_inx, mdns_ip_protocol_t ip_protocol, bool join)
{
struct netif *netif = NULL;
esp_netif_t *tcpip_if = _mdns_get_esp_netif(if_inx);
if (!esp_netif_is_netif_up(tcpip_if)) {
// Network interface went down before event propagated, skipping IGMP config
return ESP_ERR_INVALID_STATE;
}
netif = esp_netif_get_netif_impl(tcpip_if);
assert(netif);
#if LWIP_IPV4
if (ip_protocol == MDNS_IP_PROTOCOL_V4) {
ip4_addr_t multicast_addr;
IP4_ADDR(&multicast_addr, 224, 0, 0, 251);
if (join) {
if (igmp_joingroup_netif(netif, &multicast_addr)) {
return ESP_ERR_INVALID_STATE;
}
} else {
if (igmp_leavegroup_netif(netif, &multicast_addr)) {
return ESP_ERR_INVALID_STATE;
}
}
}
#endif // LWIP_IPV4
#if LWIP_IPV6
if (ip_protocol == MDNS_IP_PROTOCOL_V6) {
ip_addr_t multicast_addr = IPADDR6_INIT(0x000002ff, 0, 0, 0xfb000000);
if (join) {
if (mld6_joingroup_netif(netif, ip_2_ip6(&multicast_addr))) {
return ESP_ERR_INVALID_STATE;
}
} else {
if (mld6_leavegroup_netif(netif, ip_2_ip6(&multicast_addr))) {
return ESP_ERR_INVALID_STATE;
}
}
}
#endif // LWIP_IPV6
return ESP_OK;
}
/**
* @brief the receive callback of the raw udp api. Packets are received here
*
*/
static void _udp_recv(void *arg, struct udp_pcb *upcb, struct pbuf *pb, const ip_addr_t *raddr, uint16_t rport)
{
uint8_t i;
while (pb != NULL) {
struct pbuf *this_pb = pb;
pb = pb->next;
this_pb->next = NULL;
mdns_rx_packet_t *packet = (mdns_rx_packet_t *)mdns_mem_malloc(sizeof(mdns_rx_packet_t));
if (!packet) {
HOOK_MALLOC_FAILED;
//missed packet - no memory
pbuf_free(this_pb);
continue;
}
packet->tcpip_if = MDNS_MAX_INTERFACES;
packet->pb = this_pb;
packet->src_port = rport;
#if LWIP_IPV4 && LWIP_IPV6
packet->src.type = raddr->type;
memcpy(&packet->src.u_addr, &raddr->u_addr, sizeof(raddr->u_addr));
#elif LWIP_IPV4
packet->src.type = IPADDR_TYPE_V4;
packet->src.u_addr.ip4.addr = raddr->addr;
#elif LWIP_IPV6
packet->src.type = IPADDR_TYPE_V6;
memcpy(&packet->src.u_addr.ip6, raddr, sizeof(ip_addr_t));
#endif
packet->dest.type = packet->src.type;
#if LWIP_IPV4
if (packet->src.type == IPADDR_TYPE_V4) {
packet->ip_protocol = MDNS_IP_PROTOCOL_V4;
struct ip_hdr *iphdr = (struct ip_hdr *)(((uint8_t *)(packet->pb->payload)) - UDP_HLEN - IP_HLEN);
packet->dest.u_addr.ip4.addr = iphdr->dest.addr;
packet->multicast = ip4_addr_ismulticast(&(packet->dest.u_addr.ip4));
}
#endif // LWIP_IPV4
#if LWIP_IPV6
if (packet->src.type == IPADDR_TYPE_V6) {
packet->ip_protocol = MDNS_IP_PROTOCOL_V6;
struct ip6_hdr *ip6hdr = (struct ip6_hdr *)(((uint8_t *)(packet->pb->payload)) - UDP_HLEN - IP6_HLEN);
memcpy(&packet->dest.u_addr.ip6.addr, (uint8_t *)ip6hdr->dest.addr, 16);
packet->multicast = ip6_addr_ismulticast(&(packet->dest.u_addr.ip6));
}
#endif // LWIP_IPV6
//lwip does not return the proper pcb if you have more than one for the same multicast address (but different interfaces)
struct netif *netif = NULL;
bool found = false;
for (i = 0; i < MDNS_MAX_INTERFACES; i++) {
netif = esp_netif_get_netif_impl(_mdns_get_esp_netif(i));
if (s_interfaces[i].proto && netif && netif == ip_current_input_netif()) {
#if LWIP_IPV4
if (packet->src.type == IPADDR_TYPE_V4) {
if ((packet->src.u_addr.ip4.addr & ip_2_ip4(&netif->netmask)->addr) != (ip_2_ip4(&netif->ip_addr)->addr & ip_2_ip4(&netif->netmask)->addr)) {
//packet source is not in the same subnet
break;
}
}
#endif // LWIP_IPV4
packet->tcpip_if = i;
found = true;
break;
}
}
if (!found || _mdns_send_rx_action(packet) != ESP_OK) {
pbuf_free(this_pb);
mdns_mem_free(packet);
}
}
}
bool mdns_is_netif_ready(mdns_if_t netif, mdns_ip_protocol_t ip_proto)
{
return s_interfaces[netif].ready &&
s_interfaces[netif].proto & (ip_proto == MDNS_IP_PROTOCOL_V4 ? PROTO_IPV4 : PROTO_IPV6);
}
/**
* @brief Check if any of the interfaces is up
*/
static bool _udp_pcb_is_in_use(void)
{
int i, p;
for (i = 0; i < MDNS_MAX_INTERFACES; i++) {
for (p = 0; p < MDNS_IP_PROTOCOL_MAX; p++) {
if (mdns_is_netif_ready(i, p)) {
return true;
}
}
}
return false;
}
/**
* @brief Stop PCB Main code
*/
static void _udp_pcb_deinit(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
s_interfaces[tcpip_if].proto &= ~(ip_protocol == MDNS_IP_PROTOCOL_V4 ? PROTO_IPV4 : PROTO_IPV6);
if (s_interfaces[tcpip_if].proto == 0) {
s_interfaces[tcpip_if].ready = false;
_udp_join_group(tcpip_if, ip_protocol, false);
if (!_udp_pcb_is_in_use()) {
_udp_pcb_main_deinit();
}
}
}
/**
* @brief Start PCB Main code
*/
static esp_err_t _udp_pcb_init(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
if (mdns_is_netif_ready(tcpip_if, ip_protocol)) {
return ESP_ERR_INVALID_STATE;
}
esp_err_t err = _udp_join_group(tcpip_if, ip_protocol, true);
if (err) {
return err;
}
err = _udp_pcb_main_init();
if (err) {
return err;
}
s_interfaces[tcpip_if].proto |= (ip_protocol == MDNS_IP_PROTOCOL_V4 ? PROTO_IPV4 : PROTO_IPV6);
s_interfaces[tcpip_if].ready = true;
return ESP_OK;
}
typedef struct {
struct tcpip_api_call_data call;
mdns_if_t tcpip_if;
mdns_ip_protocol_t ip_protocol;
struct pbuf *pbt;
const ip_addr_t *ip;
uint16_t port;
esp_err_t err;
} mdns_api_call_t;
/**
* @brief Start PCB from LwIP thread
*/
static err_t _mdns_pcb_init_api(struct tcpip_api_call_data *api_call_msg)
{
mdns_api_call_t *msg = (mdns_api_call_t *)api_call_msg;
msg->err = _udp_pcb_init(msg->tcpip_if, msg->ip_protocol) == ESP_OK ? ERR_OK : ERR_IF;
return msg->err;
}
/**
* @brief Stop PCB from LwIP thread
*/
static err_t _mdns_pcb_deinit_api(struct tcpip_api_call_data *api_call_msg)
{
mdns_api_call_t *msg = (mdns_api_call_t *)api_call_msg;
_udp_pcb_deinit(msg->tcpip_if, msg->ip_protocol);
msg->err = ESP_OK;
return ESP_OK;
}
/*
* Non-static functions below are
* - _mdns prefixed
* - commented in mdns_networking.h header
*/
esp_err_t _mdns_pcb_init(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
mdns_api_call_t msg = {
.tcpip_if = tcpip_if,
.ip_protocol = ip_protocol
};
tcpip_api_call(_mdns_pcb_init_api, &msg.call);
return msg.err;
}
esp_err_t _mdns_pcb_deinit(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
mdns_api_call_t msg = {
.tcpip_if = tcpip_if,
.ip_protocol = ip_protocol
};
tcpip_api_call(_mdns_pcb_deinit_api, &msg.call);
return msg.err;
}
static err_t _mdns_udp_pcb_write_api(struct tcpip_api_call_data *api_call_msg)
{
void *nif = NULL;
mdns_api_call_t *msg = (mdns_api_call_t *)api_call_msg;
nif = esp_netif_get_netif_impl(_mdns_get_esp_netif(msg->tcpip_if));
if (!nif || !mdns_is_netif_ready(msg->tcpip_if, msg->ip_protocol) || _pcb_main == NULL) {
pbuf_free(msg->pbt);
msg->err = ERR_IF;
return ERR_IF;
}
esp_err_t err = udp_sendto_if(_pcb_main, msg->pbt, msg->ip, msg->port, (struct netif *)nif);
pbuf_free(msg->pbt);
msg->err = err;
return err;
}
size_t _mdns_udp_pcb_write(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, const esp_ip_addr_t *ip, uint16_t port, uint8_t *data, size_t len)
{
struct pbuf *pbt = pbuf_alloc(PBUF_TRANSPORT, len, PBUF_RAM);
if (pbt == NULL) {
return 0;
}
memcpy((uint8_t *)pbt->payload, data, len);
ip_addr_t ip_add_copy;
#if LWIP_IPV6 && LWIP_IPV4
ip_add_copy.type = ip->type;
memcpy(&(ip_add_copy.u_addr), &(ip->u_addr), sizeof(ip_add_copy.u_addr));
#elif LWIP_IPV4
ip_add_copy.addr = ip->u_addr.ip4.addr;
#elif LWIP_IPV6
#if LWIP_IPV6_SCOPES
ip_add_copy.zone = ip->u_addr.ip6.zone;
#endif // LWIP_IPV6_SCOPES
memcpy(ip_add_copy.addr, ip->u_addr.ip6.addr, sizeof(ip_add_copy.addr));
#endif
mdns_api_call_t msg = {
.tcpip_if = tcpip_if,
.ip_protocol = ip_protocol,
.pbt = pbt,
.ip = &ip_add_copy,
.port = port
};
tcpip_api_call(_mdns_udp_pcb_write_api, &msg.call);
if (msg.err) {
return 0;
}
return len;
}
void *_mdns_get_packet_data(mdns_rx_packet_t *packet)
{
return packet->pb->payload;
}
size_t _mdns_get_packet_len(mdns_rx_packet_t *packet)
{
return packet->pb->len;
}
void _mdns_packet_free(mdns_rx_packet_t *packet)
{
pbuf_free(packet->pb);
mdns_mem_free(packet);
}
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