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feat(lwip): Add IPv6 static neighbor cache entry support

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Add esp_netif_add_static_neighbor() and esp_netif_remove_static_neighbor(),
gated by CONFIG_LWIP_ND6_SUPPORT_STATIC_ENTRIES. These API's let callers
install/remove permanent IPv6->MAC mappings that bypass Neighbor Discovery
(no NS/NA). The calls run in the TCP/IP context and wrap the underlying lwIP
nd6_add_static_neighbor()/nd6_remove_static_neighbor() functions.
This commit is contained in:
Nachiket Kukade
2026-07-04 00:05:20 +08:00
committed by BOT
parent 1b59e8a526
commit 02da1d5807
5 changed files with 110 additions and 1 deletions
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components/esp_netif/include/esp_netif.h
+37
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@@ -862,6 +862,43 @@ int esp_netif_get_all_ip6(esp_netif_t *esp_netif, esp_ip6_addr_t if_ip6[]);
*/
int esp_netif_get_all_preferred_ip6(esp_netif_t *esp_netif, esp_ip6_addr_t if_ip6[]);
#if CONFIG_LWIP_ND6_SUPPORT_STATIC_ENTRIES
/**
* @brief Add or update a static (permanent) IPv6 neighbor cache entry
*
* Installs a fixed IPv6 -> link-layer address mapping that bypasses Neighbor
* Discovery: no Neighbor Solicitation/Advertisement is exchanged for this
* address, the entry never ages out and is never overwritten by incoming
* advertisements. Calling again with the same address updates the mapping.
*
* @param[in] esp_netif Handle to esp-netif instance
* @param[in] addr Neighbor's IPv6 address
* @param[in] mac Neighbor's link-layer address (interface hwaddr_len bytes)
*
* @return
* - ESP_OK on success
* - ESP_ERR_ESP_NETIF_INVALID_PARAMS on invalid arguments
* - ESP_FAIL if the entry could not be installed (e.g. neighbor cache full)
*/
esp_err_t esp_netif_add_static_neighbor(esp_netif_t *esp_netif, const esp_ip6_addr_t *addr, const uint8_t *mac);
/**
* @brief Remove a static IPv6 neighbor cache entry
*
* Removes an entry previously added with esp_netif_add_static_neighbor().
* Dynamic (non-static) entries are left untouched.
*
* @param[in] esp_netif Handle to esp-netif instance
* @param[in] addr Neighbor's IPv6 address
*
* @return
* - ESP_OK on success
* - ESP_ERR_ESP_NETIF_INVALID_PARAMS on invalid arguments
* - ESP_FAIL if no matching static entry exists
*/
esp_err_t esp_netif_remove_static_neighbor(esp_netif_t *esp_netif, const esp_ip6_addr_t *addr);
#endif /* CONFIG_LWIP_ND6_SUPPORT_STATIC_ENTRIES */
/**
* @brief Cause the TCP/IP stack to add an IPv6 address to the interface
*