first commit

2023-03-20 09:43:11 +01:00
commit 00e68532d1
22 changed files with 3401 additions and 0 deletions
@@ -0,0 +1,98 @@
+#include <assert.h>
+#include <stdint.h>
+#include <stddef.h>
+#include "defs.h"
+
+#define ARP_MAX_PENDING_REQUESTS 32
+#define ARP_TRANSLATION_TABLE_SIZE 128
+
+typedef enum {
+    ARP_RESOLUTION_OK,
+    ARP_RESOLUTION_FAILED,
+    ARP_RESOLUTION_TIMEOUT,
+} arp_resolution_status_t;
+
+typedef struct arp_translation_table_entry_t arp_translation_table_entry_t;
+struct arp_translation_table_entry_t {
+    arp_translation_table_entry_t *prev;
+    arp_translation_table_entry_t *next;
+    mac_address_t mac;
+    ip_address_t  ip;
+    uint64_t timeout;
+};
+
+typedef struct {
+    uint64_t time;
+    arp_translation_table_entry_t *used_list_head;
+    arp_translation_table_entry_t *used_list_tail;
+    arp_translation_table_entry_t *free_list;
+    arp_translation_table_entry_t entries[ARP_TRANSLATION_TABLE_SIZE];
+} arp_translation_table_t;
+
+typedef struct arp_pending_request_t arp_pending_request_t;
+struct arp_pending_request_t {
+    arp_pending_request_t *prev;
+    arp_pending_request_t *next;
+    ip_address_t ip;
+    uint64_t timeout;
+    void *callback_data;
+    void (*callback)(void*, arp_resolution_status_t status, mac_address_t);
+};
+
+typedef struct __attribute__((__packed__)) {
+    uint16_t hardware_type;
+    uint16_t protocol_type;
+    uint8_t hardware_len;
+    uint8_t protocol_len;
+    uint16_t operation_type;
+    mac_address_t sender_hardware_address;
+    ip_address_t  sender_protocol_address;
+    mac_address_t target_hardware_address;
+    ip_address_t  target_protocol_address;
+} arp_packet_t;
+
+static_assert(offsetof(arp_packet_t, hardware_type)  == 0);
+static_assert(offsetof(arp_packet_t, protocol_type)  == 2);
+static_assert(offsetof(arp_packet_t, hardware_len)   == 4);
+static_assert(offsetof(arp_packet_t, protocol_len)   == 5);
+static_assert(offsetof(arp_packet_t, operation_type) == 6);
+static_assert(offsetof(arp_packet_t, sender_hardware_address) == 8);
+static_assert(offsetof(arp_packet_t, sender_protocol_address) == 14);
+static_assert(offsetof(arp_packet_t, target_hardware_address) == 18);
+static_assert(offsetof(arp_packet_t, target_protocol_address) == 24);
+static_assert(sizeof(arp_packet_t) == 28);
+
+typedef struct {
+
+    uint64_t time;
+    uint64_t cache_timeout;
+    uint64_t request_timeout;
+
+    arp_packet_t *output;
+
+    void *send_data;
+    void (*send)(void *send_data, mac_address_t dest_mac);
+
+    ip_address_t  self_ip;
+    mac_address_t self_mac;
+    arp_translation_table_t table;
+
+    arp_pending_request_t *pending_request_free_list;
+    arp_pending_request_t *pending_request_used_list;
+    arp_pending_request_t *pending_request_used_tail;
+    arp_pending_request_t pending_request_pool[ARP_MAX_PENDING_REQUESTS];
+} arp_state_t;
+
+typedef enum {
+    ARP_PROCESS_RESULT_HWARENOTSUPP,
+    ARP_PROCESS_RESULT_PROTONOTSUPP,
+    ARP_PROCESS_RESULT_INVALID,
+    ARP_PROCESS_RESULT_OK,
+} arp_process_result_t;
+
+void arp_init(arp_state_t *state, ip_address_t ip, mac_address_t mac, void *send_data, void (*send)(void*, mac_address_t));
+void arp_free(arp_state_t *state);
+arp_process_result_t arp_process_packet(arp_state_t *state, const void *packet, size_t len);
+void arp_resolve_mac(arp_state_t *state, ip_address_t ip, void *userp, void (*callback)(void*, arp_resolution_status_t, mac_address_t));
+void arp_seconds_passed(arp_state_t *state, size_t seconds);
+void arp_change_output_buffer(arp_state_t *state, void *ptr, size_t max);