support IPv4 & IPv6 frag reassemble

src/CMakeLists.txt

@@ -2,6 +2,7 @@ add_subdirectory(log)
 add_subdirectory(timestamp)
 add_subdirectory(tuple)
 add_subdirectory(packet)
+add_subdirectory(ip_reassemble)
 add_subdirectory(id_generator)
 add_subdirectory(dupkt_filter)
 add_subdirectory(eviction_filter)

src/dupkt_filter/dupkt_filter.cpp

@@ -3,7 +3,7 @@
 #include "timestamp.h"
 #include "dablooms.h"
 #include "tcp_utils.h"
-#include "ipv4_helpers.h"
+#include "ipv4_utils.h"
 #include "dupkt_filter.h"
 
 struct dupkt_filter_key

src/eviction_filter/eviction_filter.cpp

@@ -5,7 +5,7 @@
 #include "timestamp.h"
 #include "dablooms.h"
 #include "udp_utils.h"
-#include "ipv4_helpers.h"
+#include "ipv4_utils.h"
 #include "ipv6_utils.h"
 #include "eviction_filter.h"
 

src/ip_fragment/ip_fragment.cpp

@@ -5,9 +5,9 @@
  * Packets in the pkts_out array should be freed by calling the packet_free() function
  */
 
-uint16_t ipv4_fragment_packet(struct packet *pkt_in, struct packet **pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size)
+uint16_t ipv4_fragment_packet(struct packet *pkt_in, struct packet **pkts_out, uint16_t n_pkts_out, uint16_t mtu_size)
 {
-    if (pkt_in == NULL || pkts_out == NULL || nb_pkts_out == 0)
+    if (pkt_in == NULL || pkts_out == NULL || n_pkts_out == 0)
     {
         IP_FRAGMENT_LOG_ERROR("invalid input parameters");
         return 0;
@@ -18,9 +18,9 @@ uint16_t ipv4_fragment_packet(struct packet *pkt_in, struct packet **pkts_out, u
     return 0;
 }
 
-uint16_t ipv6_fragment_packet(struct packet *pkt_in, struct packet **pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size)
+uint16_t ipv6_fragment_packet(struct packet *pkt_in, struct packet **pkts_out, uint16_t n_pkts_out, uint16_t mtu_size)
 {
-    if (pkt_in == NULL || pkts_out == NULL || nb_pkts_out == 0)
+    if (pkt_in == NULL || pkts_out == NULL || n_pkts_out == 0)
     {
         IP_FRAGMENT_LOG_ERROR("invalid input parameters");
         return 0;

src/ip_fragment/ip_fragment.h

@@ -16,8 +16,8 @@ extern "C"
  * Return the number of fragmented packets, stored in the pkts_out array
  * Packets in the pkts_out array should be freed by calling the packet_free() function
  */
-uint16_t ipv4_fragment_packet(struct packet *pkt_in, struct packet **pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size);
+uint16_t ipv4_fragment_packet(struct packet *pkt_in, struct packet **pkts_out, uint16_t n_pkts_out, uint16_t mtu_size);
-uint16_t ipv6_fragment_packet(struct packet *pkt_in, struct packet **pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size);
+uint16_t ipv6_fragment_packet(struct packet *pkt_in, struct packet **pkts_out, uint16_t n_pkts_out, uint16_t mtu_size);
 
 #ifdef __cpluscplus
 }

src/ip_reassemble/CMakeLists.txt

@@ -0,0 +1,9 @@
+###############################################################################
+# ip_reassemble
+###############################################################################
+
+add_library(ip_reassemble ip_reassemble.cpp)
+target_include_directories(ip_reassemble PUBLIC ${CMAKE_CURRENT_LIST_DIR})
+target_link_libraries(ip_reassemble timestamp packet)
+
+add_subdirectory(test)

src/ip_reassemble/ip_reassemble.cpp

@@ -1,13 +1,784 @@
+#include <stdlib.h>
+#include <string.h>
+#include <sys/queue.h>
+#include <assert.h>
+
+#include "packet.h"
+#include "timestamp.h"
+#include "crc32_hash.h"
+#include "checksum.h"
+#include "ipv4_utils.h"
+#include "ipv6_utils.h"
+#include "packet_helpers.h"
 #include "ip_reassemble.h"
 
+#define IP_FRAG_HASH_FNUM 2
+#define PRIME_VALUE 0xeaad8405
+
+#define IP_FRAG_TBL_POS(mgr, sig) ((mgr)->table + ((sig) & (mgr)->entry_mask))
+
+#define IPV4_KEYLEN 1
+#define IPV6_KEYLEN 4
+#define IPv6_KEY_BYTES(key) (key)[0], (key)[1], (key)[2], (key)[3]
+
+#define IP_REASSEMBLE_DEBUG_ARG1(desc, key, ...)                                                                             \
+    do                                                                                                                       \
+    {                                                                                                                        \
+        if ((key)->src_dst_len == IPV4_KEYLEN)                                                                               \
+        {                                                                                                                    \
+            IP_REASSEMBLE_DEBUG(desc, "key <%lu, %#x>", (key)->src_dst_addr[0], (key)->ip_id);                               \
+        }                                                                                                                    \
+        else                                                                                                                 \
+        {                                                                                                                    \
+            IP_REASSEMBLE_DEBUG(desc, "key <%08lu%08lu%08lu%08lu, %#x>", IPv6_KEY_BYTES((key)->src_dst_addr), (key)->ip_id); \
+        }                                                                                                                    \
+    } while (0)
+
+#define IP_REASSEMBLE_ERROR_ARG1(desc, key, ...)                                                                             \
+    do                                                                                                                       \
+    {                                                                                                                        \
+        if ((key)->src_dst_len == IPV4_KEYLEN)                                                                               \
+        {                                                                                                                    \
+            IP_REASSEMBLE_ERROR(desc, "key <%lu, %#x>", (key)->src_dst_addr[0], (key)->ip_id);                               \
+        }                                                                                                                    \
+        else                                                                                                                 \
+        {                                                                                                                    \
+            IP_REASSEMBLE_ERROR(desc, "key <%08lu%08lu%08lu%08lu, %#x>", IPv6_KEY_BYTES((key)->src_dst_addr), (key)->ip_id); \
+        }                                                                                                                    \
+    } while (0)
+
+/******************************************************************************
+ * Structs
+ ******************************************************************************/
+
+enum
+{
+    IP_LAST_FRAG_IDX,
+    IP_FIRST_FRAG_IDX,
+    IP_MIN_FRAG_NUM,
+    IP_MAX_FRAG_NUM = 8,
+};
+
+struct ip_frag_hdr
+{
+    uint16_t l3_offset;
+    uint16_t l3_len;
+    uint16_t hdr_len;
+    uint8_t next_proto;
+    void *hdr_data; // need be freed
+};
+
+struct ip_frag_pkt
+{
+    uint16_t offset;
+    uint16_t len;
+    void *data; // need be freed
+};
+
+struct ip_flow_key
+{
+    uint64_t src_dst_addr[4]; // src and dst address (only first 8 bytes used for IPv4)
+    uint32_t src_dst_len;
+    uint32_t ip_id; // ipv4: identification is uint16_t; ipv6: identification is uint32_t
+    uint8_t proto;
+};
+
+struct ip_flow
+{
+    struct
+    {
+        struct ip_flow *tqe_next;
+        struct ip_flow **tqe_prev;
+    } lru;
+    struct ip_flow_key key;
+    struct ip_frag_hdr hdr;
+    uint64_t create_time;
+    uint32_t expected_total_size;
+    uint32_t received_frag_size;
+    uint32_t next_fill_idx;
+    struct ip_frag_pkt frags[IP_MAX_FRAG_NUM]; // first two entries in the frags[] array are for the last and first fragments.
+};
+
+struct ip_reassemble_stat
+{
+    uint64_t find_num;
+    uint64_t add_num;
+    uint64_t del_num;
+    uint64_t fail_total;
+    uint64_t fail_nospace;
+};
+
+struct ip_reassemble_manager
+{
+    // config
+    bool enable;
+    uint32_t timeout;
+    uint32_t bucket_entries;
+    uint32_t bucket_num;
+
+    // runtime
+    uint32_t entry_used;
+    uint32_t entry_total;
+    uint32_t entry_mask;
+
+    // stats
+    struct ip_reassemble_stat stat;
+
+    // hash table
+    struct
+    {
+        struct ip_flow *tqh_first;
+        struct ip_flow **tqh_last;
+    } lru;
+    struct ip_flow *last;
+    struct ip_flow *table; // array of ip_frag_pkt
+};
+
+/******************************************************************************
+ * Private API
+ ******************************************************************************/
+
+static inline uint32_t combine32ms1b(uint32_t x)
+{
+    x |= x >> 1;
+    x |= x >> 2;
+    x |= x >> 4;
+    x |= x >> 8;
+    x |= x >> 16;
+
+    return x;
+}
+
+static inline uint32_t align32pow2(uint32_t x)
+{
+    x--;
+    x = combine32ms1b(x);
+
+    return x + 1;
+}
+
+static inline int is_power_of_2(uint32_t n)
+{
+    return n && !(n & (n - 1));
+}
+
+static inline int ip_reassemble_check_config(const struct ip_reassemble_config *config)
+{
+    if (config == NULL)
+    {
+        IP_REASSEMBLE_DEBUG("invalid config");
+        return -1;
+    }
+
+    if (config->enable)
+    {
+        if (config->timeout == 0)
+        {
+            IP_REASSEMBLE_DEBUG("invalid timeout");
+            return -1;
+        }
+
+        if (config->bucket_entries == 0 || is_power_of_2(config->bucket_entries) == 0)
+        {
+            IP_REASSEMBLE_DEBUG("invalid bucket entries, must be power of 2");
+            return -1;
+        }
+
+        if (config->bucket_num == 0)
+        {
+            IP_REASSEMBLE_DEBUG("invalid bucket num");
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
+/******************************************************************************
+ * struct ip_flow_key
+ ******************************************************************************/
+
+static inline void ipv4_flow_key_hash(const struct ip_flow_key *key, uint32_t *value1, uint32_t *value2)
+{
+    uint32_t v = 0;
+    const uint32_t *p = (const uint32_t *)&key->src_dst_addr;
+
+    v = crc32_hash_4byte(p[0], PRIME_VALUE);
+    v = crc32_hash_4byte(p[1], v);
+    v = crc32_hash_4byte(key->ip_id, v);
+
+    *value1 = v;
+    *value2 = (v << 7) + (v >> 14);
+}
+
+static inline void ipv6_flow_key_hash(const struct ip_flow_key *key, uint32_t *value1, uint32_t *value2)
+{
+    uint32_t v = 0;
+    const uint32_t *p = (const uint32_t *)&key->src_dst_addr;
+
+    v = crc32_hash_4byte(p[0], PRIME_VALUE);
+    v = crc32_hash_4byte(p[1], v);
+    v = crc32_hash_4byte(p[2], v);
+    v = crc32_hash_4byte(p[3], v);
+    v = crc32_hash_4byte(p[4], v);
+    v = crc32_hash_4byte(p[5], v);
+    v = crc32_hash_4byte(p[6], v);
+    v = crc32_hash_4byte(p[7], v);
+    v = crc32_hash_4byte(key->ip_id, v);
+
+    *value1 = v;
+    *value2 = (v << 7) + (v >> 14);
+}
+
+static inline uint64_t ip_flow_key_cmp(const struct ip_flow_key *key1, const struct ip_flow_key *key2)
+{
+    if (key1->ip_id != key2->ip_id)
+    {
+        return 1;
+    }
+
+    if (key1->src_dst_len != key2->src_dst_len)
+    {
+        return 1;
+    }
+
+    for (uint32_t i = 0; i < key1->src_dst_len; i++)
+    {
+        if (key1->src_dst_addr[i] != key2->src_dst_addr[i])
+        {
+            return 1;
+        }
+    }
+
+    return 0;
+}
+
+static inline int ip_flow_key_is_empty(const struct ip_flow_key *key)
+{
+    return (key->src_dst_len == 0);
+}
+
+static inline void ip_flow_key_zero(struct ip_flow_key *key)
+{
+    key->src_dst_addr[0] = 0;
+    key->src_dst_addr[1] = 0;
+    key->src_dst_addr[2] = 0;
+    key->src_dst_addr[3] = 0;
+
+    key->src_dst_len = 0;
+    key->ip_id = 0;
+}
+
+/******************************************************************************
+ * struct ip_frag_hdr
+ ******************************************************************************/
+
+static inline void *memdup(const void *src, size_t len)
+{
+    if (src == NULL || len == 0)
+    {
+        return NULL;
+    }
+
+    void *dst = malloc(len);
+    if (dst == NULL)
+    {
+        return NULL;
+    }
+    return memcpy(dst, src, len);
+}
+
+static inline void ip_frag_hdr_init(struct ip_frag_hdr *hdr, const struct packet *pkt)
+{
+    struct layer_record *layer = pkt->frag_layer;
+
+    if (layer->type == LAYER_TYPE_IPV6)
+    {
+        struct ip6_frag *frag_ext = ipv6_hdr_get_frag_ext((const struct ip6_hdr *)layer->hdr_ptr);
+        hdr->next_proto = frag_ext->ip6f_nxt;
+    }
+    else
+    {
+        hdr->next_proto = ipv4_hdr_get_proto((const struct ip *)layer->hdr_ptr);
+    }
+
+    hdr->l3_offset = layer->hdr_offset;
+    hdr->l3_len = layer->hdr_len;
+
+    hdr->hdr_len = layer->hdr_offset + layer->hdr_len;
+    hdr->hdr_data = memdup(pkt->data_ptr, hdr->hdr_len);
+}
+
+static inline void ip_frag_hdr_free(struct ip_frag_hdr *hdr)
+{
+    hdr->next_proto = 0;
+
+    hdr->l3_offset = 0;
+    hdr->l3_len = 0;
+
+    hdr->hdr_len = 0;
+    if (hdr->hdr_data != NULL)
+    {
+        free(hdr->hdr_data);
+        hdr->hdr_data = NULL;
+    }
+}
+
+/******************************************************************************
+ * struct ip_flow
+ ******************************************************************************/
+
+static inline void ip_flow_init(struct ip_flow *flow, const struct ip_flow_key *key)
+{
+    static const struct ip_frag_pkt zero_frag = {
+        .offset = 0,
+        .len = 0,
+        .data = NULL,
+    };
+
+    flow->lru.tqe_next = NULL;
+    flow->lru.tqe_prev = NULL;
+    flow->key = *key;
+    flow->create_time = timestamp_get_msec();
+    flow->expected_total_size = UINT32_MAX;
+    flow->received_frag_size = 0;
+    flow->next_fill_idx = IP_MIN_FRAG_NUM;
+    flow->frags[IP_LAST_FRAG_IDX] = zero_frag;
+    flow->frags[IP_FIRST_FRAG_IDX] = zero_frag;
+}
+
+static inline void ip_flow_free(struct ip_flow *flow)
+{
+    for (uint32_t i = 0; i < IP_MAX_FRAG_NUM; i++)
+    {
+        struct ip_frag_pkt *frag = &flow->frags[i];
+        frag->offset = 0;
+        frag->len = 0;
+        if (frag->data != NULL)
+        {
+            free(frag->data);
+            frag->data = NULL;
+        }
+    }
+    ip_flow_key_zero(&flow->key);
+    ip_frag_hdr_free(&flow->hdr);
+}
+
+static inline int ip_flow_is_ready(struct ip_flow *flow)
+{
+    return (flow->received_frag_size == flow->expected_total_size && flow->frags[IP_FIRST_FRAG_IDX].data != NULL);
+}
+
+// return  0 : success
+// return -1 : failed
+static inline int ip_flow_update(struct ip_flow *flow, const struct packet *pkt,
+                                 char *data, uint16_t len, uint16_t offset, bool more_frags)
+{
+    uint32_t idx;
+
+    if (offset == 0)
+    {
+        if (flow->frags[IP_FIRST_FRAG_IDX].data != NULL)
+        {
+            IP_REASSEMBLE_ERROR_ARG1("duplicate first fragment encountered: ", &flow->key);
+            return -1;
+        }
+        idx = IP_FIRST_FRAG_IDX;
+        ip_frag_hdr_init(&flow->hdr, pkt);
+    }
+    else if (more_frags == 0)
+    {
+        if (flow->frags[IP_LAST_FRAG_IDX].data != NULL)
+        {
+            IP_REASSEMBLE_ERROR_ARG1("duplicate last fragment encountered: ", &flow->key);
+            return -1;
+        }
+        idx = IP_LAST_FRAG_IDX;
+        flow->expected_total_size = offset + len;
+    }
+    else
+    {
+        if (flow->next_fill_idx >= IP_MAX_FRAG_NUM)
+        {
+            IP_REASSEMBLE_ERROR_ARG1("max number of fragment exceeded: ", &flow->key);
+            return -1;
+        }
+        idx = flow->next_fill_idx;
+        flow->next_fill_idx++;
+    }
+
+    flow->received_frag_size += len;
+    flow->frags[idx].data = memdup(data, len);
+    flow->frags[idx].offset = offset;
+    flow->frags[idx].len = len;
+
+    return 0;
+}
+
+/******************************************************************************
+ * ip flow table
+ ******************************************************************************/
+
+static inline void ip_flow_table_add(struct ip_reassemble_manager *mgr, struct ip_flow *flow)
+{
+    TAILQ_INSERT_TAIL(&mgr->lru, flow, lru);
+    mgr->entry_used++;
+    mgr->stat.add_num++;
+}
+
+static inline void ip_flow_table_del(struct ip_reassemble_manager *mgr, struct ip_flow *flow)
+{
+    TAILQ_REMOVE(&mgr->lru, flow, lru);
+    mgr->entry_used--;
+    mgr->stat.del_num++;
+}
+
+static inline void ip_flow_table_reuse(struct ip_reassemble_manager *mgr, struct ip_flow *flow)
+{
+    ip_flow_table_del(mgr, flow);
+    ip_flow_table_add(mgr, flow);
+}
+
+/*
+ * if return NULL, then *free and *expired are valid
+ *      free   : the first empty entry in the bucket
+ *      expired: the first timed-out entry in the bucket
+ */
+static struct ip_flow *ip_flow_table_find(struct ip_reassemble_manager *mgr, const struct ip_flow_key *key, struct ip_flow **free, struct ip_flow **expired)
+{
+    mgr->stat.find_num++;
+
+    if (mgr->last != NULL && ip_flow_key_cmp(key, &mgr->last->key) == 0)
+    {
+        return mgr->last;
+    }
+
+    uint32_t sig1 = 0;
+    uint32_t sig2 = 0;
+    uint64_t timeout = mgr->timeout;
+    uint32_t assoc = mgr->bucket_entries;
+    uint64_t tms = timestamp_get_msec();
+
+    if (key->src_dst_len == IPV4_KEYLEN)
+    {
+        ipv4_flow_key_hash(key, &sig1, &sig2);
+    }
+    else
+    {
+        ipv6_flow_key_hash(key, &sig1, &sig2);
+    }
+
+    // get the bucket by hash
+    struct ip_flow *p1 = IP_FRAG_TBL_POS(mgr, sig1);
+    struct ip_flow *p2 = IP_FRAG_TBL_POS(mgr, sig2);
+
+    // search in the bucket
+    struct ip_flow *old = NULL;
+    struct ip_flow *empty = NULL;
+    for (uint32_t i = 0; i != assoc; i++)
+    {
+        if (ip_flow_key_cmp(key, &p1[i].key) == 0)
+        {
+            *free = NULL;
+            *expired = NULL;
+            return p1 + i;
+        }
+        else if (ip_flow_key_is_empty(&p1[i].key))
+        {
+            empty = (empty == NULL) ? (p1 + i) : empty;
+        }
+        else if (timeout + p1[i].create_time < tms)
+        {
+            old = (old == NULL) ? (p1 + i) : old;
+        }
+
+        if (ip_flow_key_cmp(key, &p2[i].key) == 0)
+        {
+            *free = NULL;
+            *expired = NULL;
+            return p2 + i;
+        }
+        else if (ip_flow_key_is_empty(&p2[i].key))
+        {
+            empty = (empty == NULL) ? (p2 + i) : empty;
+        }
+        else if (timeout + p2[i].create_time < tms)
+        {
+            old = (old == NULL) ? (p2 + i) : old;
+        }
+    }
+
+    *free = empty;
+    *expired = old;
+    return NULL;
+}
+
+static struct ip_flow *ip_flow_table_update(struct ip_reassemble_manager *mgr, const struct ip_flow_key *key)
+{
+    struct ip_flow *free = NULL;
+    struct ip_flow *expired = NULL;
+    struct ip_flow *flow = NULL;
+    uint64_t tms = timestamp_get_msec();
+
+    flow = ip_flow_table_find(mgr, key, &free, &expired);
+    if (flow == NULL)
+    {
+        if (expired)
+        {
+            IP_REASSEMBLE_DEBUG_ARG1("ip flow new (use expired iterm): ", key);
+            ip_flow_free(expired);
+            ip_flow_init(expired, key);
+            ip_flow_table_reuse(mgr, expired);
+
+            mgr->last = expired;
+            return expired;
+        }
+
+        if (free)
+        {
+            IP_REASSEMBLE_DEBUG_ARG1("ip flow new (use free iterm): ", key);
+            ip_flow_init(free, key);
+            ip_flow_table_add(mgr, free);
+
+            mgr->last = free;
+            return free;
+        }
+
+        // no space
+        IP_REASSEMBLE_DEBUG_ARG1("bucket full discarding new fragmented packets: ", key);
+        mgr->stat.fail_nospace++;
+        return NULL;
+    }
+    else
+    {
+        // expired
+        if (mgr->timeout + flow->create_time < tms)
+        {
+            IP_REASSEMBLE_DEBUG_ARG1("ip flow find, but expired: ", key);
+            ip_flow_free(flow);
+            ip_flow_init(flow, key);
+            ip_flow_table_reuse(mgr, flow);
+
+            mgr->last = flow;
+            return flow;
+        }
+        // not expired
+        else
+        {
+            IP_REASSEMBLE_DEBUG_ARG1("ip flow find, not expired: ", key);
+            mgr->last = flow;
+            return flow;
+        }
+    }
+}
+
+void ip_flow_table_expire(struct ip_reassemble_manager *mgr)
+{
+    struct ip_flow *flow = NULL;
+    uint64_t curr_ts = timestamp_get_msec();
+    uint64_t timeout = mgr->timeout;
+
+    TAILQ_FOREACH(flow, &mgr->lru, lru)
+    if (timeout + flow->create_time < curr_ts)
+    {
+        IP_REASSEMBLE_DEBUG_ARG1("time expires discarding old fragmented packets: ", &flow->key);
+        ip_flow_free(flow);
+        ip_flow_table_del(mgr, flow);
+    }
+}
+
+/******************************************************************************
+ * frag reassemble
+ ******************************************************************************/
+
+static struct packet *ip_frag_reassemble(struct ip_flow *flow)
+{
+    struct ip_frag_pkt *first = &flow->frags[IP_FIRST_FRAG_IDX];
+    struct ip_frag_pkt *last = &flow->frags[IP_LAST_FRAG_IDX];
+    struct ip_frag_pkt *temp = NULL;
+
+    // calculate the length of the reassembled packet
+    uint32_t buff_len = flow->expected_total_size + flow->hdr.hdr_len;
+    char *buff = (char *)calloc(1, buff_len + sizeof(struct packet));
+    if (buff == NULL)
+    {
+        IP_REASSEMBLE_ERROR("unable to allocate memory");
+        return NULL;
+    }
+
+    char *ptr = buff + sizeof(struct packet);
+    char *end = ptr + buff_len;
+
+    // copy last frag
+    if (last->len > end - ptr)
+    {
+        IP_REASSEMBLE_ERROR_ARG1("last packet length is greater than the expected reassembled length: ", &flow->key);
+        free(buff);
+        return NULL;
+    }
+    end -= last->len;
+    memcpy(end, last->data, last->len);
+
+    uint32_t loop = 0;
+    uint16_t last_offset = last->offset;
+    while (first->len != last_offset)
+    {
+        /*
+         * https://datatracker.ietf.org/doc/html/rfc791
+         *
+         * In the case that two or more fragments contain the same data
+         * either identically or through a partial overlap, this procedure
+         * will use the more recently arrived copy in the data buffer and
+         * datagram delivered.
+         */
+
+        for (uint32_t i = flow->next_fill_idx - 1; i >= IP_MIN_FRAG_NUM; i--)
+        {
+            if (i == IP_FIRST_FRAG_IDX || i == IP_LAST_FRAG_IDX)
+            {
+                continue;
+            }
+
+            temp = &flow->frags[i];
+            if (temp->offset + temp->len == last_offset)
+            {
+                if (temp->len > end - ptr)
+                {
+                    IP_REASSEMBLE_ERROR_ARG1("middle fragment packet length doesn't match last fragment packet offset: ", &flow->key);
+                    free(buff);
+                    return NULL;
+                }
+
+                end -= temp->len;
+                memcpy(end, temp->data, temp->len);
+                last_offset = temp->offset;
+                break;
+            }
+        }
+
+        if (loop > flow->next_fill_idx)
+        {
+            IP_REASSEMBLE_ERROR_ARG1("holes appear during frag reassemble: ", &flow->key);
+            free(buff);
+            return NULL;
+        }
+
+        loop++;
+    }
+
+    // copy fist fragment data
+    if (first->len > end - ptr)
+    {
+        IP_REASSEMBLE_ERROR_ARG1("last packet length is greater than the expected reassembled length: ", &flow->key);
+        free(buff);
+        return NULL;
+    }
+    end -= first->len;
+    memcpy(end, first->data, first->len);
+
+    // copy frag hdr
+    if (flow->hdr.hdr_len > end - ptr)
+    {
+        IP_REASSEMBLE_ERROR_ARG1("hdr length is greater than the expected reassembled length: ", &flow->key);
+        free(buff);
+        return NULL;
+    }
+    end -= flow->hdr.hdr_len;
+    memcpy(end, flow->hdr.hdr_data, flow->hdr.hdr_len);
+    assert(ptr == end);
+
+    if (flow->key.src_dst_len == IPV4_KEYLEN)
+    {
+        // update ip total length & ip checksum
+        struct ip *hdr = (struct ip *)(ptr + flow->hdr.l3_offset);
+        ipv4_hdr_set_total_len(hdr, buff_len - flow->hdr.l3_offset); // update total length
+        ipv4_hdr_set_mf_flag(hdr, false);                            // update more fragment flag
+        ipv4_hdr_set_frag_offset(hdr, 0);                            // update fragment offset
+        hdr->ip_sum = 0;                                             // update checksum
+        hdr->ip_sum = checksum((char *)hdr, flow->hdr.l3_len);
+    }
+    else
+    {
+        // update ipv6 payload length & next header
+        struct ip6_hdr *hdr = (struct ip6_hdr *)(ptr + flow->hdr.l3_offset);
+        ipv6_hdr_set_payload_len(hdr, flow->expected_total_size); // update payload length
+        ipv6_hdr_set_next_header(hdr, flow->hdr.next_proto);      // update next header
+    }
+
+    // create a new packet
+    struct packet *new_pkt = (struct packet *)buff;
+    packet_parse(new_pkt, buff + sizeof(struct packet), buff_len);
+
+    return new_pkt;
+}
+
+/******************************************************************************
+ * Public API
+ ******************************************************************************/
+
 struct ip_reassemble_manager *ip_reassemble_manager_create(const struct ip_reassemble_config *config)
 {
-    // TODO
+    if (ip_reassemble_check_config(config) != 0)
+    {
+        return NULL;
+    }
+
+    struct ip_reassemble_manager *mgr = (struct ip_reassemble_manager *)calloc(1, sizeof(struct ip_reassemble_manager));
+    if (mgr == NULL)
+    {
+        IP_REASSEMBLE_ERROR("unable to allocate memory");
+        return NULL;
+    }
+    mgr->enable = config->enable;
+    mgr->timeout = config->timeout;
+    mgr->bucket_entries = config->bucket_entries;
+    mgr->bucket_num = config->bucket_num;
+
+    if (!mgr->enable)
+    {
+        return mgr;
+    }
+
+    uint64_t entry_total = align32pow2(mgr->bucket_num) * mgr->bucket_entries * IP_FRAG_HASH_FNUM;
+    if (entry_total > UINT32_MAX)
+    {
+        IP_REASSEMBLE_ERROR("bucket_num * bucket_entries is too large");
+        free(mgr);
+        return NULL;
+    }
+
+    mgr->entry_total = (uint32_t)entry_total;
+    mgr->entry_mask = (mgr->entry_total - 1) & ~(mgr->bucket_entries - 1);
+    mgr->table = (struct ip_flow *)calloc(mgr->entry_total, sizeof(struct ip_flow));
+    if (mgr->table == NULL)
+    {
+        IP_REASSEMBLE_ERROR("unable to allocate memory");
+        free(mgr);
+        return NULL;
+    }
+
+    TAILQ_INIT(&(mgr->lru));
+
+    return mgr;
 }
 
 void ip_reassemble_manager_destory(struct ip_reassemble_manager *mgr)
 {
-    // TODO
+    if (mgr)
+    {
+        if (mgr->table)
+        {
+            for (uint32_t i = 0; i < mgr->entry_total; i++)
+            {
+                ip_flow_free(mgr->table + i);
+            }
+
+            free(mgr->table);
+            mgr->table = NULL;
+        }
+        free(mgr);
+        mgr = NULL;
+    }
 }
 
 void ip_reassemble_manager_stat(struct ip_reassemble_manager *mgr)
@@ -20,12 +791,185 @@ void ip_reassemble_manager_stat(struct ip_reassemble_manager *mgr)
  * The returned packet should be freed by calling the packet_free() function
  */
 
+struct packet *ip_reassemble_packet(struct ip_reassemble_manager *mgr, const struct packet *pkt)
+{
+    struct packet *pkt1;
+    struct packet *pkt2;
+
+    if (!mgr->enable)
+    {
+        return NULL;
+    }
+
+    const struct layer_record *layer = pkt->frag_layer;
+    if (layer == NULL)
+    {
+        return NULL;
+    }
+
+    if (layer->type == LAYER_TYPE_IPV4)
+    {
+        pkt1 = ipv4_reassemble_packet(mgr, pkt);
+        if (pkt1 && pkt1->frag_layer)
+        {
+            pkt2 = ip_reassemble_packet(mgr, pkt);
+            packet_free(pkt1);
+            return pkt2;
+        }
+
+        return pkt1;
+    }
+    else if (layer->type == LAYER_TYPE_IPV6)
+    {
+        pkt1 = ipv6_reassemble_packet(mgr, pkt);
+        if (pkt1 && pkt1->frag_layer)
+        {
+            pkt2 = ip_reassemble_packet(mgr, pkt);
+            packet_free(pkt1);
+            return pkt2;
+        }
+
+        return pkt1;
+    }
+    else
+    {
+        return NULL;
+    }
+}
+
 struct packet *ipv4_reassemble_packet(struct ip_reassemble_manager *mgr, const struct packet *pkt)
 {
-    // TODO
+    struct layer_record *layer = pkt->frag_layer;
+    struct ip *hdr = (struct ip *)layer->hdr_ptr;
+    char *data = (char *)layer->pld_ptr;
+    uint16_t len = ipv4_hdr_get_total_len(hdr) - ipv4_hdr_get_hdr_len(hdr);
+    if (len > layer->pld_len)
+    {
+        IP_REASSEMBLE_ERROR("unexpected header length on fragmented packet, ip_id: %lu", ipv4_hdr_get_ipid(hdr));
+        return NULL;
+    }
+
+    struct ip_flow_key key = {0};
+    uint64_t src_addr = hdr->ip_src.s_addr;
+    uint64_t dst_addr = hdr->ip_dst.s_addr;
+    key.src_dst_addr[0] = src_addr << 32 | dst_addr;
+    key.src_dst_len = IPV4_KEYLEN;
+    key.ip_id = ipv4_hdr_get_ipid(hdr);
+    key.proto = ipv4_hdr_get_proto(hdr);
+    struct ip_flow *flow = ip_flow_table_update(mgr, &key);
+    if (flow == NULL)
+    {
+        return NULL;
+    }
+
+    bool more_frags = ipv4_hdr_get_mf_flag(hdr);
+    uint16_t offset = ipv4_hdr_get_frag_offset(hdr);
+    if (ip_flow_update(flow, pkt, data, len, offset, more_frags) != 0)
+    {
+        ip_flow_free(flow);
+        ip_flow_table_del(mgr, flow);
+        return NULL;
+    }
+
+    if (!ip_flow_is_ready(flow))
+    {
+        return NULL;
+    }
+
+    struct packet *new_pkt = ip_frag_reassemble(flow);
+    ip_flow_free(flow);
+    ip_flow_table_del(mgr, flow);
+
+    return new_pkt;
 }
 
+/*
+ * https://datatracker.ietf.org/doc/html/rfc8200#section-4.5
+ *
+ * Note: unlike IPv4, fragmentation in IPv6 is performed only by source nodes,
+ * not by routers along a packet's delivery path
+ */
+
+/*
+ * original packet:
+ * +-----------------+-----------------+--------+--------+-//-+--------+
+ * |  Per-Fragment   |Ext & Upper-Layer|  first | second |    |  last  |
+ * |    Headers      |    Headers      |fragment|fragment|....|fragment|
+ * +-----------------+-----------------+--------+--------+-//-+--------+
+ *
+ * fragment packets:
+ * +-----------------+--------+-------------------+----------+
+ * |  Per-Fragment   |Fragment| Ext & Upper-Layer |  first   |
+ * |    Headers      | Header |   Headers         | fragment |
+ * +-----------------+--------+-------------------+----------+
+ *
+ * +-----------------+--------+----------+
+ * |  Per-Fragment   |Fragment|  second  |
+ * |    Headers      | Header | fragment |
+ * +-----------------+--------+----------+
+ *                          o
+ *                          o
+ *                          o
+ * +-----------------+--------+----------+
+ * |  Per-Fragment   |Fragment|   last   |
+ * |    Headers      | Header | fragment |
+ * +-----------------+--------+----------+
+ *
+ * reassembled packet:
+ * +-----------------+-----------------+--------+--------+-//-+--------+
+ * |  Per-Fragment   |Ext & Upper-Layer|  first | second |    |  last  |
+ * |    Headers      |    Headers      |fragment|fragment|....|fragment|
+ * +-----------------+-----------------+--------+--------+-//-+--------+
+ */
+
 struct packet *ipv6_reassemble_packet(struct ip_reassemble_manager *mgr, const struct packet *pkt)
 {
-    // TODO
+    struct layer_record *layer = pkt->frag_layer;
-}
+    const struct ip6_hdr *hdr = (const struct ip6_hdr *)layer->hdr_ptr;
+    struct ip6_frag *frag_ext = ipv6_hdr_get_frag_ext(hdr);
+    if (frag_ext == NULL)
+    {
+        return NULL;
+    }
+    struct ip_flow_key key = {0};
+    memcpy(&key.src_dst_addr[0], hdr->ip6_src.s6_addr, 16);
+    memcpy(&key.src_dst_addr[2], hdr->ip6_dst.s6_addr, 16);
+    key.src_dst_len = IPV6_KEYLEN;
+    key.ip_id = frag_ext->ip6f_ident;
+    key.proto = 0; // only first fragment has the upper layer protocol
+
+    struct ip_flow *flow = ip_flow_table_update(mgr, &key);
+    if (flow == NULL)
+    {
+        return NULL;
+    }
+
+    char *data = (char *)layer->hdr_ptr + sizeof(struct ip6_hdr) + sizeof(struct ip6_frag);
+    uint16_t len = ipv6_hdr_get_payload_len(hdr) - sizeof(struct ip6_frag);
+
+    if (data + len > pkt->data_ptr + pkt->data_len)
+    {
+        IP_REASSEMBLE_ERROR("unexpected header length on fragmented packet, frag_id: %lu", frag_ext->ip6f_ident);
+        return NULL;
+    }
+
+    bool more_frags = (frag_ext->ip6f_offlg & IP6F_MORE_FRAG);
+    uint16_t offset = ntohs(frag_ext->ip6f_offlg & IP6F_OFF_MASK);
+    if (ip_flow_update(flow, pkt, data, len, offset, more_frags) != 0)
+    {
+        ip_flow_free(flow);
+        ip_flow_table_del(mgr, flow);
+        return NULL;
+    }
+
+    if (!ip_flow_is_ready(flow))
+    {
+        return NULL;
+    }
+
+    struct packet *new_pkt = ip_frag_reassemble(flow);
+    ip_flow_free(flow);
+    ip_flow_table_del(mgr, flow);
+
+    return new_pkt;
+}

src/ip_reassemble/ip_reassemble.h

@@ -14,10 +14,9 @@ extern "C"
 
 struct ip_reassemble_config
 {
-    bool enable_reassemble;
+    bool enable;
 
-    uint32_t max_cycles;
+    uint32_t timeout;
-    uint32_t max_entries;
     uint32_t bucket_entries;
     uint32_t bucket_num;
 };
@@ -30,6 +29,7 @@ void ip_reassemble_manager_stat(struct ip_reassemble_manager *mgr);
  * Returns the reassembled packet, or NULL if the packet is not reassembled
  * The returned packet should be freed by calling the packet_free() function
  */
+struct packet *ip_reassemble_packet(struct ip_reassemble_manager *mgr, const struct packet *pkt);
 struct packet *ipv4_reassemble_packet(struct ip_reassemble_manager *mgr, const struct packet *pkt);
 struct packet *ipv6_reassemble_packet(struct ip_reassemble_manager *mgr, const struct packet *pkt);
 

src/ip_reassemble/test/CMakeLists.txt

@@ -0,0 +1,13 @@
+###############################################################################
+# gtest
+###############################################################################
+
+add_executable(gtest_ipv4_reassemble gtest_ipv4_reassemble.cpp)
+target_link_libraries(gtest_ipv4_reassemble ip_reassemble gtest)
+
+add_executable(gtest_ipv6_reassemble gtest_ipv6_reassemble.cpp)
+target_link_libraries(gtest_ipv6_reassemble ip_reassemble gtest)
+
+include(GoogleTest)
+gtest_discover_tests(gtest_ipv4_reassemble)
+gtest_discover_tests(gtest_ipv6_reassemble)

src/ip_reassemble/test/gtest_ipv4_reassemble.cpp

@@ -0,0 +1,300 @@
+#include <gtest/gtest.h>
+
+#include "timestamp.h"
+#include "tcp_utils.h"
+#include "ipv4_utils.h"
+#include "packet_helpers.h"
+#include "ip_reassemble.h"
+
+struct ip_reassemble_config config = {
+    .enable = true,
+    .timeout = 1000,
+    .bucket_entries = 16,
+    .bucket_num = 8,
+};
+
+/*
+ * Frame 4: 60 bytes on wire (480 bits), 60 bytes captured (480 bits)
+ * Ethernet II, Src: Fortinet_cc:87:22 (e8:1c:ba:cc:87:22), Dst: EvocInte_2f:35:b8 (00:22:46:2f:35:b8)
+ *     Destination: EvocInte_2f:35:b8 (00:22:46:2f:35:b8)
+ *         Address: EvocInte_2f:35:b8 (00:22:46:2f:35:b8)
+ *         .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
+ *         .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
+ *     Source: Fortinet_cc:87:22 (e8:1c:ba:cc:87:22)
+ *         Address: Fortinet_cc:87:22 (e8:1c:ba:cc:87:22)
+ *         .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
+ *         .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
+ *     Type: IPv4 (0x0800)
+ *     Padding: 0000
+ * Internet Protocol Version 4, Src: 192.168.36.103, Dst: 192.168.40.137
+ *     0100 .... = Version: 4
+ *     .... 0101 = Header Length: 20 bytes (5)
+ *     Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
+ *         0000 00.. = Differentiated Services Codepoint: Default (0)
+ *         .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
+ *     Total Length: 44
+ *     Identification: 0xffff (65535)
+ *     001. .... = Flags: 0x1, More fragments
+ *         0... .... = Reserved bit: Not set
+ *         .0.. .... = Don't fragment: Not set
+ *         ..1. .... = More fragments: Set
+ *     ...0 0000 0000 0000 = Fragment Offset: 0
+ *     Time to Live: 127
+ *     Protocol: TCP (6)
+ *     Header Checksum: 0x4d8b [correct]
+ *     [Header checksum status: Good]
+ *     [Calculated Checksum: 0x4d8b]
+ *     Source Address: 192.168.36.103
+ *     Destination Address: 192.168.40.137
+ *     [Reassembled IPv4 in frame: 5]
+ * Data (24 bytes)
+ *     Data: f4a5270f9107248703d518e75018ff005e9200003132330a
+ *     [Length: 24]
+ */
+
+unsigned char frag1[] = {
+    /* ETH */
+    0x00, 0x22, 0x46, 0x2f, 0x35, 0xb8, 0xe8, 0x1c, 0xba, 0xcc, 0x87, 0x22, 0x08, 0x00,
+    /* IP */
+    0x45, 0x00,             // version & hdr len & tos
+    0x00, 0x2c,             // total length
+    0xff, 0xff,             // ip id
+    0x20, 0x00,             // flags & frag offset
+    0x7f, 0x06,             // ttl & protocol
+    0x4d, 0x8b,             // checksum
+    0xc0, 0xa8, 0x24, 0x67, // src addr
+    0xc0, 0xa8, 0x28, 0x89, // dst addr
+    /* TCP */
+    0xf4, 0xa5,             // src port
+    0x27, 0x0f,             // dst port
+    0x91, 0x07, 0x24, 0x87, // seq
+    0x03, 0xd5, 0x18, 0xe7, // ack
+    0x50, 0x18,             // data offset & flags
+    0xff, 0x00,             // windows
+    0x5e, 0x92,             // checksum
+    0x00, 0x00,             // urgent pointer
+    /* DATA */
+    0x31, 0x32, 0x33, 0x0a,
+    /* Padding */
+    0x00, 0x00};
+
+/*
+ * Frame 5: 60 bytes on wire (480 bits), 60 bytes captured (480 bits)
+ * Ethernet II, Src: Fortinet_cc:87:22 (e8:1c:ba:cc:87:22), Dst: EvocInte_2f:35:b8 (00:22:46:2f:35:b8)
+ *     Destination: EvocInte_2f:35:b8 (00:22:46:2f:35:b8)
+ *         Address: EvocInte_2f:35:b8 (00:22:46:2f:35:b8)
+ *         .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
+ *         .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
+ *     Source: Fortinet_cc:87:22 (e8:1c:ba:cc:87:22)
+ *         Address: Fortinet_cc:87:22 (e8:1c:ba:cc:87:22)
+ *         .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
+ *         .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
+ *     Type: IPv4 (0x0800)
+ *     Padding: 0000
+ * Internet Protocol Version 4, Src: 192.168.36.103, Dst: 192.168.40.137
+ *     0100 .... = Version: 4
+ *     .... 0101 = Header Length: 20 bytes (5)
+ *     Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
+ *         0000 00.. = Differentiated Services Codepoint: Default (0)
+ *         .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
+ *     Total Length: 44
+ *     Identification: 0xffff (65535)
+ *     000. .... = Flags: 0x0
+ *         0... .... = Reserved bit: Not set
+ *         .0.. .... = Don't fragment: Not set
+ *         ..0. .... = More fragments: Not set
+ *     ...0 0000 0000 0011 = Fragment Offset: 24
+ *     Time to Live: 127
+ *     Protocol: TCP (6)
+ *     Header Checksum: 0x6d88 [correct]
+ *     [Header checksum status: Good]
+ *     [Calculated Checksum: 0x6d88]
+ *     Source Address: 192.168.36.103
+ *     Destination Address: 192.168.40.137
+ *     [2 IPv4 Fragments (48 bytes): #4(24), #5(24)]
+ *         [Frame: 4, payload: 0-23 (24 bytes)]
+ *         [Frame: 5, payload: 24-47 (24 bytes)]
+ *         [Fragment count: 2]
+ *         [Reassembled IPv4 length: 48]
+ *         [Reassembled IPv4 data: f4a5270f9107248703d518e75018ff005e9200003132330af4a5270f9107248b03d518e7…]
+ * Transmission Control Protocol, Src Port: 62629, Dst Port: 9999, Seq: 1, Ack: 1, Len: 28
+ *     Source Port: 62629
+ *     Destination Port: 9999
+ *     [Stream index: 0]
+ *     [Conversation completeness: Complete, WITH_DATA (31)]
+ *     [TCP Segment Len: 28]
+ *     Sequence Number: 1    (relative sequence number)
+ *     Sequence Number (raw): 2433164423
+ *     [Next Sequence Number: 29    (relative sequence number)]
+ *     Acknowledgment Number: 1    (relative ack number)
+ *     Acknowledgment number (raw): 64297191
+ *     0101 .... = Header Length: 20 bytes (5)
+ *     Flags: 0x018 (PSH, ACK)
+ *         000. .... .... = Reserved: Not set
+ *         ...0 .... .... = Accurate ECN: Not set
+ *         .... 0... .... = Congestion Window Reduced: Not set
+ *         .... .0.. .... = ECN-Echo: Not set
+ *         .... ..0. .... = Urgent: Not set
+ *         .... ...1 .... = Acknowledgment: Set
+ *         .... .... 1... = Push: Set
+ *         .... .... .0.. = Reset: Not set
+ *         .... .... ..0. = Syn: Not set
+ *         .... .... ...0 = Fin: Not set
+ *         [TCP Flags: ·······AP···]
+ *     Window: 65280
+ *     [Calculated window size: 65280]
+ *     [Window size scaling factor: -2 (no window scaling used)]
+ *     Checksum: 0x5e92 [correct]
+ *     [Checksum Status: Good]
+ *     [Calculated Checksum: 0x5e92]
+ *     Urgent Pointer: 0
+ *     [Timestamps]
+ *         [Time since first frame in this TCP stream: 6.525912000 seconds]
+ *         [Time since previous frame in this TCP stream: 6.525083000 seconds]
+ *     [SEQ/ACK analysis]
+ *         [iRTT: 0.000829000 seconds]
+ *         [Bytes in flight: 28]
+ *         [Bytes sent since last PSH flag: 28]
+ *     TCP payload (28 bytes)
+ * Data (28 bytes)
+ *     Data: 3132330af4a5270f9107248b03d518e75018ff00301600006162630a
+ *     [Length: 28]
+ */
+
+unsigned char frag2[] = {
+    /* ETH */
+    0x00, 0x22, 0x46, 0x2f, 0x35, 0xb8, 0xe8, 0x1c, 0xba, 0xcc, 0x87, 0x22, 0x08, 0x00,
+    /* IP */
+    0x45, 0x00,             // version & hdr len & tos
+    0x00, 0x2c,             // total length
+    0xff, 0xff,             // ip id
+    0x00, 0x03,             // flags & frag offset
+    0x7f, 0x06,             // ttl & protocol
+    0x6d, 0x88,             // checksum
+    0xc0, 0xa8, 0x24, 0x67, // src addr
+    0xc0, 0xa8, 0x28, 0x89, // dst addr
+    /* DATA */
+    0xf4, 0xa5, 0x27, 0x0f, 0x91, 0x07, 0x24, 0x8b, 0x03, 0xd5, 0x18, 0xe7, 0x50, 0x18, 0xff, 0x00, 0x30, 0x16, 0x00, 0x00, 0x61, 0x62, 0x63, 0x0a,
+    /* Padding */
+    0x00, 0x00};
+
+unsigned char expect[] = {
+    /* ETH */
+    0x00, 0x22, 0x46, 0x2f, 0x35, 0xb8, 0xe8, 0x1c, 0xba, 0xcc, 0x87, 0x22, 0x08, 0x00,
+    /* IP */
+    0x45, 0x00,             // version & hdr len & tos
+    0x00, 0x44,             // total length         --------- need update ---------
+    0xff, 0xff,             // ip id
+    0x00, 0x00,             // flags & frag offset  --------- need update ---------
+    0x7f, 0x06,             // ttl & protocol
+    0x6d, 0x73,             // checksum             --------- need update ---------
+    0xc0, 0xa8, 0x24, 0x67, // src addr
+    0xc0, 0xa8, 0x28, 0x89, // dst addr
+    /* TCP */
+    0xf4, 0xa5,             // src port
+    0x27, 0x0f,             // dst port
+    0x91, 0x07, 0x24, 0x87, // seq
+    0x03, 0xd5, 0x18, 0xe7, // ack
+    0x50, 0x18,             // data offset & flags
+    0xff, 0x00,             // windows
+    0x5e, 0x92,             // checksum
+    0x00, 0x00,             // urgent pointer
+    /* DATA */
+    0x31, 0x32, 0x33, 0x0a,                                                                                                                        // data from frag1
+    0xf4, 0xa5, 0x27, 0x0f, 0x91, 0x07, 0x24, 0x8b, 0x03, 0xd5, 0x18, 0xe7, 0x50, 0x18, 0xff, 0x00, 0x30, 0x16, 0x00, 0x00, 0x61, 0x62, 0x63, 0x0a // data from frag2
+};
+
+TEST(IPV4_REASSEMBLE, PADDING)
+{
+    struct packet pkt;
+    struct packet *new_pkt;
+    const struct layer_record *layer;
+    struct ip_reassemble_manager *mgr;
+
+    timestamp_update();
+
+    mgr = ip_reassemble_manager_create(&config);
+    EXPECT_TRUE(mgr != NULL);
+
+    // frag1
+    packet_parse(&pkt, (const char *)frag1, sizeof(frag1));
+    new_pkt = ip_reassemble_packet(mgr, &pkt);
+    EXPECT_TRUE(new_pkt == NULL);
+
+    // frag2
+    packet_parse(&pkt, (const char *)frag2, sizeof(frag2));
+    new_pkt = ip_reassemble_packet(mgr, &pkt);
+    EXPECT_TRUE(new_pkt);
+
+    // check packet
+    packet_print(new_pkt);
+    EXPECT_TRUE(new_pkt->data_len == 14 /* ETH */ + 20 /* IPv4 */ + 20 /* TCP */ + 28 /* DATA */);
+    EXPECT_TRUE(new_pkt->data_len == sizeof(expect));
+    EXPECT_TRUE(memcmp(new_pkt->data_ptr, expect, new_pkt->data_len) == 0);
+
+    // check IPv4
+    layer = packet_get_innermost_layer(new_pkt, LAYER_TYPE_IPV4);
+    EXPECT_TRUE(layer);
+    struct ip *hdr = (struct ip *)layer->hdr_ptr;
+    EXPECT_TRUE(ipv4_hdr_get_version(hdr) == 4);
+    EXPECT_TRUE(ipv4_hdr_get_hdr_len(hdr) == 20 /* IPv4 */);
+    EXPECT_TRUE(ipv4_hdr_get_tos(hdr) == 0);
+    EXPECT_TRUE(ipv4_hdr_get_total_len(hdr) == 20 /* IPv4 */ + 20 /* TCP */ + 28 /* DATA */);
+    EXPECT_TRUE(ipv4_hdr_get_ipid(hdr) == 0xffff);
+    EXPECT_TRUE(ipv4_hdr_get_flags(hdr) == 0x0);
+    EXPECT_TRUE(ipv4_hdr_get_frag_offset(hdr) == 0);
+    EXPECT_TRUE(ipv4_hdr_get_ttl(hdr) == 127);
+    EXPECT_TRUE(ipv4_hdr_get_proto(hdr) == 6);
+    EXPECT_TRUE(ipv4_hdr_get_checksum(hdr) == 0x6d73); // NOTE this is correct checksum
+    EXPECT_TRUE(ipv4_hdr_get_src_addr(hdr) == 0xc0a82467);
+    EXPECT_TRUE(ipv4_hdr_get_dst_addr(hdr) == 0xc0a82889);
+    EXPECT_TRUE(ipv4_hdr_get_opt_len(hdr) == 0);
+    EXPECT_TRUE(ipv4_hdr_get_opt_data(hdr) == NULL);
+
+    // check TCP
+    layer = packet_get_innermost_layer(new_pkt, LAYER_TYPE_TCP);
+    EXPECT_TRUE(layer);
+    struct tcphdr *tcp_hdr = (struct tcphdr *)layer->hdr_ptr;
+    EXPECT_TRUE(tcp_hdr_get_src_port(tcp_hdr) == 62629);
+    EXPECT_TRUE(tcp_hdr_get_dst_port(tcp_hdr) == 9999);
+    EXPECT_TRUE(tcp_hdr_get_seq(tcp_hdr) == 2433164423);
+    EXPECT_TRUE(tcp_hdr_get_ack(tcp_hdr) == 64297191);
+    EXPECT_TRUE(tcp_hdr_get_hdr_len(tcp_hdr) == 20);
+    EXPECT_TRUE(tcp_hdr_get_flags(tcp_hdr) == 0x018);
+    EXPECT_TRUE(tcp_hdr_get_window(tcp_hdr) == 65280);
+    EXPECT_TRUE(tcp_hdr_get_checksum(tcp_hdr) == 0x5e92);
+    EXPECT_TRUE(tcp_hdr_get_urg_ptr(tcp_hdr) == 0);
+    EXPECT_TRUE(tcp_hdr_get_opt_len(tcp_hdr) == 0);
+    EXPECT_TRUE(tcp_hdr_get_opt_data(tcp_hdr) == NULL);
+
+    // free packet
+    packet_free(new_pkt);
+
+    ip_reassemble_manager_destory(mgr);
+}
+
+TEST(IPV4_REASSEMBLE, EXPIRE)
+{
+    // TODO
+}
+
+TEST(IPV4_REASSEMBLE, FULL)
+{
+    // TODO
+}
+
+TEST(IPV4_REASSEMBLE, HOLE)
+{
+    // TODO
+}
+
+TEST(IPV4_REASSEMBLE, NESTED)
+{
+    // TODO
+}
+
+int main(int argc, char **argv)
+{
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}

src/ip_reassemble/test/gtest_ipv6_reassemble.cpp

@@ -0,0 +1,715 @@
+#include <gtest/gtest.h>
+
+#include "timestamp.h"
+#include "udp_utils.h"
+#include "ipv6_utils.h"
+#include "packet_helpers.h"
+#include "ip_reassemble.h"
+
+struct ip_reassemble_config config = {
+    .enable = true,
+    .timeout = 1000,
+    .bucket_entries = 16,
+    .bucket_num = 8,
+};
+
+/*
+ * Frame 3: 1510 bytes on wire (12080 bits), 1510 bytes captured (12080 bits)
+ * Ethernet II, Src: Apple_c0:61:b6 (68:5b:35:c0:61:b6), Dst: Dell_94:65:38 (00:1d:09:94:65:38)
+ *     Destination: Dell_94:65:38 (00:1d:09:94:65:38)
+ *         Address: Dell_94:65:38 (00:1d:09:94:65:38)
+ *         .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
+ *         .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
+ *     Source: Apple_c0:61:b6 (68:5b:35:c0:61:b6)
+ *         Address: Apple_c0:61:b6 (68:5b:35:c0:61:b6)
+ *         .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
+ *         .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
+ *     Type: IPv6 (0x86dd)
+ * Internet Protocol Version 6, Src: 2607:f010:3f9::1001, Dst: 2607:f010:3f9::11:0
+ *     0110 .... = Version: 6
+ *     .... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
+ *         .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
+ *         .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
+ *     .... 0010 0001 0010 1000 1001 = Flow Label: 0x21289
+ *     Payload Length: 1456
+ *     Next Header: Fragment Header for IPv6 (44)
+ *     Hop Limit: 64
+ *     Source Address: 2607:f010:3f9::1001
+ *     Destination Address: 2607:f010:3f9::11:0
+ *     Fragment Header for IPv6
+ *         Next header: UDP (17)
+ *         Reserved octet: 0x00
+ *         0000 0000 0000 0... = Offset: 0 (0 bytes)
+ *         .... .... .... .00. = Reserved bits: 0
+ *         .... .... .... ...1 = More Fragments: Yes
+ *         Identification: 0xf88eb466
+ *     [Reassembled IPv6 in frame: 6]
+ * Data (1448 bytes)
+ *     Data: 18db18db150b791606fd14ff072908076578616d706c6508077465737441707008013108…
+ *     [Length: 1448]
+ */
+
+unsigned char frag1[] = {
+    0x00, 0x1d, 0x09, 0x94, 0x65, 0x38, 0x68, 0x5b, 0x35, 0xc0, 0x61, 0xb6, 0x86, 0xdd, 0x60, 0x02, 0x12, 0x89, 0x05, 0xb0, 0x2c, 0x40, 0x26, 0x07, 0xf0, 0x10,
+    0x03, 0xf9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x01, 0x26, 0x07, 0xf0, 0x10, 0x03, 0xf9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11,
+    0x00, 0x00, 0x11, 0x00, 0x00, 0x01, 0xf8, 0x8e, 0xb4, 0x66, 0x18, 0xdb, 0x18, 0xdb, 0x15, 0x0b, 0x79, 0x16, 0x06, 0xfd, 0x14, 0xff, 0x07, 0x29, 0x08, 0x07,
+    0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x08, 0x07, 0x74, 0x65, 0x73, 0x74, 0x41, 0x70, 0x70, 0x08, 0x01, 0x31, 0x08, 0x07, 0x74, 0x65, 0x73, 0x74, 0x41,
+    0x70, 0x70, 0x08, 0x09, 0xfd, 0x00, 0x00, 0x01, 0x4f, 0x23, 0x68, 0xc7, 0x8e, 0x14, 0x04, 0x19, 0x02, 0x27, 0x10, 0x15, 0xfd, 0x13, 0x88, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
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+
+/*
+ * Frame 4: 1510 bytes on wire (12080 bits), 1510 bytes captured (12080 bits)
+ * Ethernet II, Src: Apple_c0:61:b6 (68:5b:35:c0:61:b6), Dst: Dell_94:65:38 (00:1d:09:94:65:38)
+ *     Destination: Dell_94:65:38 (00:1d:09:94:65:38)
+ *         Address: Dell_94:65:38 (00:1d:09:94:65:38)
+ *         .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
+ *         .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
+ *     Source: Apple_c0:61:b6 (68:5b:35:c0:61:b6)
+ *         Address: Apple_c0:61:b6 (68:5b:35:c0:61:b6)
+ *         .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
+ *         .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
+ *     Type: IPv6 (0x86dd)
+ * Internet Protocol Version 6, Src: 2607:f010:3f9::1001, Dst: 2607:f010:3f9::11:0
+ *     0110 .... = Version: 6
+ *     .... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
+ *         .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
+ *         .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
+ *     .... 0010 0001 0010 1000 1001 = Flow Label: 0x21289
+ *     Payload Length: 1456
+ *     Next Header: Fragment Header for IPv6 (44)
+ *     Hop Limit: 64
+ *     Source Address: 2607:f010:3f9::1001
+ *     Destination Address: 2607:f010:3f9::11:0
+ *     Fragment Header for IPv6
+ *         Next header: UDP (17)
+ *         Reserved octet: 0x00
+ *         0000 0101 1010 1... = Offset: 181 (1448 bytes)
+ *         .... .... .... .00. = Reserved bits: 0
+ *         .... .... .... ...1 = More Fragments: Yes
+ *         Identification: 0xf88eb466
+ *     [Reassembled IPv6 in frame: 6]
+ * Data (1448 bytes)
+ *     Data: 686868686868686868686868686868686868686868686868686868686868686868686868…
+ *     [Length: 1448]
+ */
+
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+    0x68, 0x68};
+
+/*
+ * Frame 5: 1510 bytes on wire (12080 bits), 1510 bytes captured (12080 bits)
+ * Ethernet II, Src: Apple_c0:61:b6 (68:5b:35:c0:61:b6), Dst: Dell_94:65:38 (00:1d:09:94:65:38)
+ *     Destination: Dell_94:65:38 (00:1d:09:94:65:38)
+ *         Address: Dell_94:65:38 (00:1d:09:94:65:38)
+ *         .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
+ *         .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
+ *     Source: Apple_c0:61:b6 (68:5b:35:c0:61:b6)
+ *         Address: Apple_c0:61:b6 (68:5b:35:c0:61:b6)
+ *         .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
+ *         .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
+ *     Type: IPv6 (0x86dd)
+ * Internet Protocol Version 6, Src: 2607:f010:3f9::1001, Dst: 2607:f010:3f9::11:0
+ *     0110 .... = Version: 6
+ *     .... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
+ *         .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
+ *         .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
+ *     .... 0010 0001 0010 1000 1001 = Flow Label: 0x21289
+ *     Payload Length: 1456
+ *     Next Header: Fragment Header for IPv6 (44)
+ *     Hop Limit: 64
+ *     Source Address: 2607:f010:3f9::1001
+ *     Destination Address: 2607:f010:3f9::11:0
+ *     Fragment Header for IPv6
+ *         Next header: UDP (17)
+ *         Reserved octet: 0x00
+ *         0000 1011 0101 0... = Offset: 362 (2896 bytes)
+ *         .... .... .... .00. = Reserved bits: 0
+ *         .... .... .... ...1 = More Fragments: Yes
+ *         Identification: 0xf88eb466
+ *     [Reassembled IPv6 in frame: 6]
+ * Data (1448 bytes)
+ *     Data: 686868686868686868686868686868686868686868686868686868686868686868686868…
+ *     [Length: 1448]
+ */
+
+unsigned char frag3[] = {
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+
+/*
+ * Frame 6: 1105 bytes on wire (8840 bits), 1105 bytes captured (8840 bits)
+ * Ethernet II, Src: Apple_c0:61:b6 (68:5b:35:c0:61:b6), Dst: Dell_94:65:38 (00:1d:09:94:65:38)
+ * Internet Protocol Version 6, Src: 2607:f010:3f9::1001, Dst: 2607:f010:3f9::11:0
+ *     0110 .... = Version: 6
+ *     .... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
+ *         .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
+ *         .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
+ *     .... 0010 0001 0010 1000 1001 = Flow Label: 0x21289
+ *     Payload Length: 1051
+ *     Next Header: Fragment Header for IPv6 (44)
+ *     Hop Limit: 64
+ *     Source Address: 2607:f010:3f9::1001
+ *     Destination Address: 2607:f010:3f9::11:0
+ *     Fragment Header for IPv6
+ *         Next header: UDP (17)
+ *         Reserved octet: 0x00
+ *         0001 0000 1111 1... = Offset: 543 (4344 bytes)
+ *         .... .... .... .00. = Reserved bits: 0
+ *         .... .... .... ...0 = More Fragments: No
+ *         Identification: 0xf88eb466
+ *     [4 IPv6 Fragments (5387 bytes): #3(1448), #4(1448), #5(1448), #6(1043)]
+ *         [Frame: 3, payload: 0-1447 (1448 bytes)]
+ *         [Frame: 4, payload: 1448-2895 (1448 bytes)]
+ *         [Frame: 5, payload: 2896-4343 (1448 bytes)]
+ *         [Frame: 6, payload: 4344-5386 (1043 bytes)]
+ *         [Fragment count: 4]
+ *         [Reassembled IPv6 length: 5387]
+ *         [Reassembled IPv6 data: 18db18db150b791606fd14ff072908076578616d706c6508077465737441707008013108…]
+ * User Datagram Protocol, Src Port: 6363, Dst Port: 6363
+ *     Source Port: 6363
+ *     Destination Port: 6363
+ *     Length: 5387
+ *     Checksum: 0x7916 [correct]
+ *         [Calculated Checksum: 0x7916]
+ *     [Checksum Status: Good]
+ *     [Stream index: 0]
+ *     [Timestamps]
+ *         [Time since first frame: 0.257001000 seconds]
+ *         [Time since previous frame: 0.019796000 seconds]
+ *     UDP payload (5379 bytes)
+ * Data (5379 bytes)
+ *     Data: 06fd14ff072908076578616d706c65080774657374417070080131080774657374417070…
+ *     [Length: 5379]
+ */
+
+unsigned char frag4[] = {
+    0x00, 0x1d, 0x09, 0x94, 0x65, 0x38, 0x68, 0x5b, 0x35, 0xc0, 0x61, 0xb6, 0x86, 0xdd, 0x60, 0x02, 0x12, 0x89, 0x04, 0x1b, 0x2c, 0x40, 0x26, 0x07, 0xf0, 0x10,
+    0x03, 0xf9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x01, 0x26, 0x07, 0xf0, 0x10, 0x03, 0xf9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11,
+    0x00, 0x00, 0x11, 0x00, 0x10, 0xf8, 0xf8, 0x8e, 0xb4, 0x66, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x16, 0x3c, 0x1b, 0x01, 0x01, 0x1c, 0x37, 0x07, 0x35, 0x08, 0x0c, 0x74, 0x6d, 0x70, 0x2d, 0x69, 0x64, 0x65, 0x6e, 0x74, 0x69, 0x74, 0x79,
+    0x08, 0x04, 0x12, 0xc2, 0x99, 0x9e, 0x08, 0x03, 0x4b, 0x45, 0x59, 0x08, 0x11, 0x6b, 0x73, 0x6b, 0x2d, 0x31, 0x34, 0x33, 0x33, 0x39, 0x38, 0x30, 0x38, 0x37,
+    0x36, 0x33, 0x30, 0x36, 0x08, 0x07, 0x49, 0x44, 0x2d, 0x43, 0x45, 0x52, 0x54, 0x17, 0xfd, 0x01, 0x00, 0x30, 0x6f, 0x6b, 0xab, 0x96, 0x61, 0x9b, 0x71, 0x2a,
+    0xf4, 0xa0, 0xde, 0x35, 0x84, 0xed, 0x89, 0xb6, 0xe7, 0x09, 0x3e, 0xe9, 0x5e, 0xb9, 0xcd, 0x1f, 0x66, 0x37, 0x5f, 0xfa, 0xbc, 0x52, 0xee, 0x40, 0xf6, 0xd1,
+    0xc5, 0x60, 0xff, 0x78, 0xf1, 0x51, 0xc9, 0x1b, 0xc9, 0x9c, 0xd0, 0xb0, 0xac, 0x0f, 0x42, 0x2e, 0x1c, 0xc1, 0xea, 0x5b, 0x50, 0xff, 0x50, 0x99, 0x60, 0x6d,
+    0x02, 0xed, 0xec, 0x2c, 0xd6, 0x97, 0x1b, 0x9a, 0xf7, 0x17, 0xde, 0xef, 0x58, 0x6b, 0xc0, 0x63, 0x6d, 0x64, 0x12, 0x77, 0xb2, 0x34, 0xbe, 0x05, 0x79, 0x8a,
+    0x59, 0x2c, 0x25, 0x94, 0x52, 0x8e, 0x1e, 0xd4, 0xdc, 0x12, 0xe7, 0x60, 0x66, 0xc9, 0x09, 0xe5, 0x9b, 0x53, 0xf2, 0xed, 0x37, 0x17, 0x91, 0x90, 0x8d, 0xe6,
+    0x8a, 0x47, 0xcd, 0xcc, 0x47, 0xab, 0xd2, 0xbe, 0xcb, 0xa8, 0x3f, 0x88, 0x7b, 0xcc, 0x58, 0x80, 0xdd, 0xb2, 0x08, 0x30, 0x79, 0x95, 0xb3, 0x8b, 0xd0, 0x5b,
+    0xc5, 0x13, 0x8c, 0x11, 0xab, 0x2b, 0x91, 0xac, 0x3c, 0x55, 0xa9, 0x52, 0x02, 0x12, 0xf1, 0xb8, 0x2f, 0xca, 0xea, 0xd0, 0x70, 0x56, 0x3c, 0x2a, 0x36, 0x6e,
+    0xd2, 0x57, 0x0c, 0xe6, 0x9b, 0xbc, 0xc8, 0x5b, 0x1c, 0x39, 0xed, 0x9b, 0x7c, 0xfa, 0xa7, 0x2b, 0x66, 0x17, 0x10, 0x40, 0x9e, 0x0f, 0xe0, 0x90, 0xd1, 0x61,
+    0xfd, 0xbb, 0xc8, 0x6d, 0x1b, 0xcf, 0xec, 0x81, 0xf7, 0xde, 0x24, 0xc3, 0x12, 0xac, 0x39, 0xfd, 0xb3, 0xa8, 0x57, 0x35, 0xc6, 0xfb, 0x1a, 0x15, 0x52, 0x23,
+    0x29, 0xa1, 0x25, 0xca, 0x66, 0x98, 0x05, 0xa6, 0x7b, 0x0d, 0x49, 0xe1, 0x76, 0x34, 0x07, 0xf7, 0x9e, 0xe5, 0xb7, 0x66, 0x39, 0xb1, 0xb0, 0xa0, 0x1a, 0x44,
+    0x90, 0xce, 0x07, 0x03, 0xf2, 0x1b, 0x0e, 0xc6, 0x17, 0xed, 0xd8, 0x4f, 0x4f};
+
+unsigned char expect[] = {
+    // ETH
+    0x00, 0x1d, 0x09, 0x94, 0x65, 0x38, 0x68, 0x5b, 0x35, 0xc0, 0x61, 0xb6, 0x86, 0xdd,
+    // IPv6
+    0x60, 0x02, 0x12, 0x89,                                                                         // version & traffic class & flow label
+    0x15, 0x0b,                                                                                     // payload length
+    0x11,                                                                                           // next header
+    0x40,                                                                                           // hop limit
+    0x26, 0x07, 0xf0, 0x10, 0x03, 0xf9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x01, // src addr
+    0x26, 0x07, 0xf0, 0x10, 0x03, 0xf9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, // dst addr
+    // IPv6 Payload
+    0x18, 0xdb, 0x18, 0xdb, 0x15, 0x0b, 0x79, 0x16, 0x06, 0xfd, 0x14, 0xff, 0x07, 0x29, 0x08, 0x07, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x08, 0x07, 0x74,
+    0x65, 0x73, 0x74, 0x41, 0x70, 0x70, 0x08, 0x01, 0x31, 0x08, 0x07, 0x74, 0x65, 0x73, 0x74, 0x41, 0x70, 0x70, 0x08, 0x09, 0xfd, 0x00, 0x00, 0x01, 0x4f, 0x23,
+    0x68, 0xc7, 0x8e, 0x14, 0x04, 0x19, 0x02, 0x27, 0x10, 0x15, 0xfd, 0x13, 0x88, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
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+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68,
+    0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x68, 0x16, 0x3c, 0x1b, 0x01, 0x01,
+    0x1c, 0x37, 0x07, 0x35, 0x08, 0x0c, 0x74, 0x6d, 0x70, 0x2d, 0x69, 0x64, 0x65, 0x6e, 0x74, 0x69, 0x74, 0x79, 0x08, 0x04, 0x12, 0xc2, 0x99, 0x9e, 0x08, 0x03,
+    0x4b, 0x45, 0x59, 0x08, 0x11, 0x6b, 0x73, 0x6b, 0x2d, 0x31, 0x34, 0x33, 0x33, 0x39, 0x38, 0x30, 0x38, 0x37, 0x36, 0x33, 0x30, 0x36, 0x08, 0x07, 0x49, 0x44,
+    0x2d, 0x43, 0x45, 0x52, 0x54, 0x17, 0xfd, 0x01, 0x00, 0x30, 0x6f, 0x6b, 0xab, 0x96, 0x61, 0x9b, 0x71, 0x2a, 0xf4, 0xa0, 0xde, 0x35, 0x84, 0xed, 0x89, 0xb6,
+    0xe7, 0x09, 0x3e, 0xe9, 0x5e, 0xb9, 0xcd, 0x1f, 0x66, 0x37, 0x5f, 0xfa, 0xbc, 0x52, 0xee, 0x40, 0xf6, 0xd1, 0xc5, 0x60, 0xff, 0x78, 0xf1, 0x51, 0xc9, 0x1b,
+    0xc9, 0x9c, 0xd0, 0xb0, 0xac, 0x0f, 0x42, 0x2e, 0x1c, 0xc1, 0xea, 0x5b, 0x50, 0xff, 0x50, 0x99, 0x60, 0x6d, 0x02, 0xed, 0xec, 0x2c, 0xd6, 0x97, 0x1b, 0x9a,
+    0xf7, 0x17, 0xde, 0xef, 0x58, 0x6b, 0xc0, 0x63, 0x6d, 0x64, 0x12, 0x77, 0xb2, 0x34, 0xbe, 0x05, 0x79, 0x8a, 0x59, 0x2c, 0x25, 0x94, 0x52, 0x8e, 0x1e, 0xd4,
+    0xdc, 0x12, 0xe7, 0x60, 0x66, 0xc9, 0x09, 0xe5, 0x9b, 0x53, 0xf2, 0xed, 0x37, 0x17, 0x91, 0x90, 0x8d, 0xe6, 0x8a, 0x47, 0xcd, 0xcc, 0x47, 0xab, 0xd2, 0xbe,
+    0xcb, 0xa8, 0x3f, 0x88, 0x7b, 0xcc, 0x58, 0x80, 0xdd, 0xb2, 0x08, 0x30, 0x79, 0x95, 0xb3, 0x8b, 0xd0, 0x5b, 0xc5, 0x13, 0x8c, 0x11, 0xab, 0x2b, 0x91, 0xac,
+    0x3c, 0x55, 0xa9, 0x52, 0x02, 0x12, 0xf1, 0xb8, 0x2f, 0xca, 0xea, 0xd0, 0x70, 0x56, 0x3c, 0x2a, 0x36, 0x6e, 0xd2, 0x57, 0x0c, 0xe6, 0x9b, 0xbc, 0xc8, 0x5b,
+    0x1c, 0x39, 0xed, 0x9b, 0x7c, 0xfa, 0xa7, 0x2b, 0x66, 0x17, 0x10, 0x40, 0x9e, 0x0f, 0xe0, 0x90, 0xd1, 0x61, 0xfd, 0xbb, 0xc8, 0x6d, 0x1b, 0xcf, 0xec, 0x81,
+    0xf7, 0xde, 0x24, 0xc3, 0x12, 0xac, 0x39, 0xfd, 0xb3, 0xa8, 0x57, 0x35, 0xc6, 0xfb, 0x1a, 0x15, 0x52, 0x23, 0x29, 0xa1, 0x25, 0xca, 0x66, 0x98, 0x05, 0xa6,
+    0x7b, 0x0d, 0x49, 0xe1, 0x76, 0x34, 0x07, 0xf7, 0x9e, 0xe5, 0xb7, 0x66, 0x39, 0xb1, 0xb0, 0xa0, 0x1a, 0x44, 0x90, 0xce, 0x07, 0x03, 0xf2, 0x1b, 0x0e, 0xc6,
+    0x17, 0xed, 0xd8, 0x4f, 0x4f};
+
+TEST(IPV6_REASSEMBLE, NORMAL)
+{
+    struct packet pkt;
+    struct packet *new_pkt;
+    const struct layer_record *layer;
+    struct ip_reassemble_manager *mgr;
+
+    timestamp_update();
+
+    mgr = ip_reassemble_manager_create(&config);
+    EXPECT_TRUE(mgr != NULL);
+
+    // frag1
+    packet_parse(&pkt, (const char *)frag1, sizeof(frag1));
+    new_pkt = ip_reassemble_packet(mgr, &pkt);
+    EXPECT_TRUE(new_pkt == NULL);
+
+    // frag2
+    packet_parse(&pkt, (const char *)frag2, sizeof(frag2));
+    new_pkt = ip_reassemble_packet(mgr, &pkt);
+    EXPECT_TRUE(new_pkt == NULL);
+
+    // frag3
+    packet_parse(&pkt, (const char *)frag3, sizeof(frag3));
+    new_pkt = ip_reassemble_packet(mgr, &pkt);
+    EXPECT_TRUE(new_pkt == NULL);
+
+    // frag4
+    packet_parse(&pkt, (const char *)frag4, sizeof(frag4));
+    new_pkt = ip_reassemble_packet(mgr, &pkt);
+    EXPECT_TRUE(new_pkt);
+
+    // check packet
+    packet_print(new_pkt);
+    EXPECT_TRUE(new_pkt->data_len == 14 /* ETH */ + 40 /* IPv6 */ + 8 /* UDP */ + 5379 /* DATA */);
+    EXPECT_TRUE(new_pkt->data_len == sizeof(expect));
+    EXPECT_TRUE(memcmp(new_pkt->data_ptr, expect, new_pkt->data_len) == 0);
+
+    // check IPv6
+    layer = packet_get_innermost_layer(new_pkt, LAYER_TYPE_IPV6);
+    EXPECT_TRUE(layer);
+    struct ip6_hdr *hdr = (struct ip6_hdr *)layer->hdr_ptr;
+    EXPECT_TRUE(ipv6_hdr_get_version(hdr) == 6);
+    EXPECT_TRUE(ipv6_hdr_get_traffic_class(hdr) == 0);
+    EXPECT_TRUE(ipv6_hdr_get_flow_label(hdr) == 0x21289);
+    EXPECT_TRUE(ipv6_hdr_get_payload_len(hdr) == 5387);
+    EXPECT_TRUE(ipv6_hdr_get_next_header(hdr) == 17); // UDP
+    EXPECT_TRUE(ipv6_hdr_get_hop_limit(hdr) == 64);
+    char src_str[INET6_ADDRSTRLEN];
+    char dst_str[INET6_ADDRSTRLEN];
+    struct in6_addr src_addr = ipv6_hdr_get_src_in6_addr(hdr);
+    struct in6_addr dst_addr = ipv6_hdr_get_dst_in6_addr(hdr);
+    inet_ntop(AF_INET6, &src_addr, src_str, INET6_ADDRSTRLEN);
+    inet_ntop(AF_INET6, &dst_addr, dst_str, INET6_ADDRSTRLEN);
+    EXPECT_TRUE(strcmp(src_str, "2607:f010:3f9::1001") == 0);
+    EXPECT_TRUE(strcmp(dst_str, "2607:f010:3f9::11:0") == 0);
+    EXPECT_TRUE(ipv6_hdr_get_frag_ext(hdr) == NULL);
+
+    // check UDP
+    layer = packet_get_innermost_layer(new_pkt, LAYER_TYPE_UDP);
+    EXPECT_TRUE(layer);
+    struct udphdr *udp_hdr = (struct udphdr *)layer->hdr_ptr;
+    EXPECT_TRUE(udp_hdr_get_src_port(udp_hdr) == 6363);
+    EXPECT_TRUE(udp_hdr_get_dst_port(udp_hdr) == 6363);
+    EXPECT_TRUE(udp_hdr_get_total_len(udp_hdr) == 5387);
+    EXPECT_TRUE(udp_hdr_get_checksum(udp_hdr) == 0x7916);
+
+    // free packet
+    packet_free(new_pkt);
+
+    ip_reassemble_manager_destory(mgr);
+}
+
+TEST(IPV6_REASSEMBLE, EXPIRE)
+{
+    // TODO
+}
+
+TEST(IPV6_REASSEMBLE, FULL)
+{
+    // TODO
+}
+
+TEST(IPV6_REASSEMBLE, HOLE)
+{
+    // TODO
+}
+
+TEST(IPV6_REASSEMBLE, NESTED)
+{
+    // TODO
+}
+
+int main(int argc, char **argv)
+{
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}

src/packet/checksum.h

@@ -0,0 +1,41 @@
+#ifndef _CHECKSUM_H
+#define _CHECKSUM_H
+
+#ifdef __cpluscplus
+extern "C"
+{
+#endif
+
+#include <stdint.h>
+
+// https://datatracker.ietf.org/doc/html/rfc1071
+static inline uint16_t checksum(char *data, int len)
+{
+    long sum = 0;
+    uint16_t *addr = (uint16_t *)data;
+
+    while (len > 1)
+    {
+        sum += *addr++;
+        len -= 2;
+    }
+
+    if (len > 0)
+    {
+        sum += *(unsigned char *)addr;
+    }
+
+    // Fold 32-bit sum to 16 bits
+    while (sum >> 16)
+    {
+        sum = (sum & 0xffff) + (sum >> 16);
+    }
+
+    return (uint16_t)(~sum);
+}
+
+#ifdef __cpluscplus
+}
+#endif
+
+#endif

src/packet/ipv4_utils.h

@@ -126,6 +126,11 @@ static inline uint8_t ipv4_hdr_get_opt_len(const struct ip *hdr)
 
 static inline const char *ipv4_hdr_get_opt_data(const struct ip *hdr)
 {
+    if (ipv4_hdr_get_opt_len(hdr) == 0)
+    {
+        return NULL;
+    }
+
     return (const char *)hdr + sizeof(struct ip);
 }
 

src/packet/ipv6_utils.h

@@ -35,6 +35,16 @@ extern "C"
  *  +                                                               +
  *  |                                                               |
  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Fragment Header
+ *
+ *  0                   1                   2                   3
+ *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |  Next Header  |   Reserved    |      Fragment Offset    |Res|M|
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |                         Identification                        |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  */
 
 /******************************************************************************
@@ -81,6 +91,15 @@ static inline struct in6_addr ipv6_hdr_get_dst_in6_addr(const struct ip6_hdr *hd
     return hdr->ip6_dst;
 }
 
+static inline struct ip6_frag *ipv6_hdr_get_frag_ext(const struct ip6_hdr *hdr)
+{
+    if (hdr->ip6_nxt != IPPROTO_FRAGMENT)
+    {
+        return NULL;
+    }
+    return (struct ip6_frag *)((char *)hdr + sizeof(struct ip6_hdr));
+}
+
 // TODO IPv6 extension headers
 
 /******************************************************************************

src/packet/packet.cpp

@@ -861,12 +861,12 @@ static inline const char *parse_ipv4(struct packet *handler, const char *data, u
         return data;
     }
     struct ip *hdr = (struct ip *)data;
-    uint8_t next_proto = ipv4_get_proto(hdr);
+    uint8_t next_proto = ipv4_hdr_get_proto(hdr);
     uint16_t hdr_len = ipv4_hdr_get_hdr_len(hdr);
     SET_LAYER(handler, layer, LAYER_TYPE_IPV4, hdr_len, data, len);
 
     // ip fragmented
-    if ((ntohs(hdr->ip_off) & IP_MF) || (ntohs(hdr->ip_off) & IP_OFFMASK))
+    if (ipv4_hdr_get_mf_flag(hdr) || ipv4_hdr_get_frag_offset(hdr))
     {
         PACKET_LOG_DEBUG("ip is fragmented");
         handler->frag_layer = layer;
@@ -893,7 +893,13 @@ static inline const char *parse_ipv6(struct packet *handler, const char *data, u
     uint8_t next_proto = ipv6_hdr_get_next_header((const struct ip6_hdr *)data);
     SET_LAYER(handler, layer, LAYER_TYPE_IPV6, sizeof(struct ip6_hdr), data, len);
 
-    // TODO ipv6 fragment
+    // ipv6 fragment
+    if (next_proto == IPPROTO_FRAGMENT)
+    {
+        PACKET_LOG_DEBUG("ipv6 is fragmented");
+        handler->frag_layer = layer;
+        return layer->pld_ptr;
+    }
 
     // TESTED
     return parse_l4(handler, next_proto, layer->pld_ptr, layer->pld_len);
@@ -1132,6 +1138,11 @@ void packet_print(const struct packet *handler)
                i, layer, layer_type_tostring(layer->type), layer->hdr_offset,
                layer->hdr_ptr, layer->hdr_len, layer->pld_ptr, layer->pld_len);
     }
+    for (uint16_t i = 0; i < handler->data_len; i++)
+    {
+        printf("0x%02x, ", (uint8_t)handler->data_ptr[i]);
+    }
+    printf("\n");
 }
 
 // return  0 : found

src/packet/packet_helpers.h

@@ -12,7 +12,8 @@ extern "C"
 #include <netinet/ip6.h>
 
 #include "packet.h"
-#include "ipv4_helpers.h"
+#include "ipv4_utils.h"
+#include "ipv6_utils.h"
 
 struct metadata
 {
@@ -71,7 +72,7 @@ static inline bool paket_is_fragment(const struct packet *pkt)
         if (pkt->layers[i].type == LAYER_TYPE_IPV4)
         {
             struct ip *ip_hdr = (struct ip *)pkt->layers[i].hdr_ptr;
-            if (ipv4_hdr_has_flag_mf(ip_hdr) || ipv4_hdr_get_frag_offset(ip_hdr))
+            if (ipv4_hdr_get_mf_flag(ip_hdr) || ipv4_hdr_get_frag_offset(ip_hdr))
             {
                 return true;
             }
@@ -79,8 +80,8 @@ static inline bool paket_is_fragment(const struct packet *pkt)
 
         if (pkt->layers[i].type == LAYER_TYPE_IPV6)
         {
-            struct ip6_hdr *ip6_hdr = (struct ip6_hdr *)pkt->layers[i].hdr_ptr;
+            const struct ip6_hdr *ip6_hdr = (const struct ip6_hdr *)pkt->layers[i].hdr_ptr;
-            if (ip6_hdr->ip6_nxt == IPPROTO_FRAGMENT)
+            if (ipv6_hdr_get_next_header(ip6_hdr) == IPPROTO_FRAGMENT)
             {
                 return true;
             }
@@ -97,7 +98,7 @@ static inline struct packet *packet_dup(const struct packet *pkt)
         return NULL;
     }
 
-    struct packet *pkt_dup = (struct packet *)calloc(1, sizeof(struct packet));
+    struct packet *pkt_dup = (struct packet *)calloc(1, sizeof(struct packet) + pkt->data_len);
     if (pkt_dup == NULL)
     {
         return NULL;
@@ -105,21 +106,23 @@ static inline struct packet *packet_dup(const struct packet *pkt)
     memcpy(pkt_dup, pkt, sizeof(struct packet));
     pkt_dup->user_data = NULL;
 
-    if (pkt->data_len)
+    pkt_dup->data_ptr = (const char *)pkt_dup + sizeof(struct packet);
+    if (pkt_dup->data_ptr == NULL)
     {
-        pkt_dup->data_ptr = (const char *)calloc(1, pkt->data_len);
+        free(pkt_dup);
-        if (pkt_dup->data_ptr == NULL)
+        return NULL;
-        {
+    }
-            free(pkt_dup);
+    memcpy((char *)pkt_dup->data_ptr, pkt->data_ptr, pkt->data_len);
-            return NULL;
-        }
-        memcpy((char *)pkt_dup->data_ptr, pkt->data_ptr, pkt->data_len);
 
-        for (int8_t i = 0; i < pkt->layers_used; i++)
+    for (int8_t i = 0; i < pkt->layers_used; i++)
-        {
+    {
-            pkt_dup->layers[i].hdr_ptr = pkt_dup->data_ptr + pkt->layers[i].hdr_offset;
+        pkt_dup->layers[i].hdr_ptr = pkt_dup->data_ptr + pkt->layers[i].hdr_offset;
-            pkt_dup->layers[i].pld_ptr = pkt_dup->data_ptr + pkt->layers[i].hdr_offset + pkt->layers[i].hdr_len;
+        pkt_dup->layers[i].pld_ptr = pkt_dup->data_ptr + pkt->layers[i].hdr_offset + pkt->layers[i].hdr_len;
-        }
+    }
+
+    if (pkt->frag_layer)
+    {
+        pkt_dup->frag_layer = &pkt_dup->layers[pkt->frag_layer - pkt->layers];
     }
     packet_set0_metadata(pkt_dup, metadata_dup(packet_get0_metadata(pkt)));
 
@@ -133,66 +136,21 @@ static inline void packet_free(struct packet *pkt)
         metadata_free((struct metadata *)packet_get0_metadata(pkt));
         packet_set0_metadata(pkt, NULL);
 
-        if (pkt->data_ptr)
-        {
-            free((char *)pkt->data_ptr);
-            pkt->data_ptr = NULL;
-        }
         free(pkt);
         pkt = NULL;
     }
 }
 
-static inline uint64_t packet_get_domain(const struct packet *pkt)
+static inline uint16_t packet_get_len(const struct packet *pkt)
-{
-    return pkt->domain;
-}
-
-static inline uint16_t packet_get_raw_len(const struct packet *pkt)
 {
     return pkt->data_len;
 }
 
-static inline const char *packet_get0_raw_data(const struct packet *pkt)
+static inline const char *packet_get_data(const struct packet *pkt)
 {
     return pkt->data_ptr;
 }
 
-static inline uint8_t packet_get_layer_count(const struct packet *pkt)
-{
-    return pkt->layers_used;
-}
-
-static inline const struct layer_record *packet_get_layer(const struct packet *pkt, uint8_t index)
-{
-    return &pkt->layers[index];
-}
-
-static inline enum layer_type layer_get_type(const struct layer_record *layer)
-{
-    return layer->type;
-}
-
-static inline const char *layer_get_hdr_ptr(const struct layer_record *layer)
-{
-    return layer->hdr_ptr;
-}
-
-static inline const char *layer_get_pld_ptr(const struct layer_record *layer)
-{
-    return layer->pld_ptr;
-}
-
-static inline uint16_t layer_get_hdr_len(const struct layer_record *layer)
-{
-    return layer->hdr_len;
-}
-
-static inline uint16_t layer_get_pld_len(const struct layer_record *layer)
-{
-    return layer->pld_len;
-}
-
 #ifdef __cpluscplus
 }
 #endif

src/packet/tcp_utils.h

@@ -121,6 +121,11 @@ static inline uint16_t tcp_hdr_get_opt_len(const struct tcphdr *hdr)
 
 static inline const char *tcp_hdr_get_opt_data(const struct tcphdr *hdr)
 {
+    if (tcp_hdr_get_opt_len(hdr) == 0)
+    {
+        return NULL;
+    }
+
     return ((const char *)hdr) + sizeof(struct tcphdr);
 }
 

src/packet/test/gtest_ipv4_utils.cpp

@@ -52,7 +52,7 @@ TEST(IPV4_UTILS, GET1)
     EXPECT_TRUE(ipv4_hdr_get_src_addr(hdr) == 0xc0a82467);
     EXPECT_TRUE(ipv4_hdr_get_dst_addr(hdr) == 0xc0a82889);
     EXPECT_TRUE(ipv4_hdr_get_opt_len(hdr) == 0);
-    EXPECT_TRUE(ipv4_hdr_get_opt_data(hdr) == data + 20);
+    EXPECT_TRUE(ipv4_hdr_get_opt_data(hdr) == NULL);
 }
 
 TEST(IPV4_UTILS, SET1)
@@ -143,7 +143,7 @@ TEST(IPV4_UTILS, GET2)
     EXPECT_TRUE(ipv4_hdr_get_src_addr(hdr) == 0xc0a82467);
     EXPECT_TRUE(ipv4_hdr_get_dst_addr(hdr) == 0xc0a82889);
     EXPECT_TRUE(ipv4_hdr_get_opt_len(hdr) == 0);
-    EXPECT_TRUE(ipv4_hdr_get_opt_data(hdr) == data + 20);
+    EXPECT_TRUE(ipv4_hdr_get_opt_data(hdr) == NULL);
 }
 
 TEST(IPV4_UTILS, SET2)
@@ -236,7 +236,7 @@ TEST(IPV4_UTILS, GET3)
     EXPECT_TRUE(ipv4_hdr_get_src_addr(hdr) == 0x7f000001);
     EXPECT_TRUE(ipv4_hdr_get_dst_addr(hdr) == 0x7f000001);
     EXPECT_TRUE(ipv4_hdr_get_opt_len(hdr) == 40);
-    EXPECT_TRUE(ipv4_hdr_get_opt_data(hdr) == data + 20);
+    EXPECT_TRUE(ipv4_hdr_get_opt_data(hdr) == (const char *)(data3 + 20));
 }
 
 TEST(IPV4_UTILS, SET3)
@@ -256,7 +256,7 @@ TEST(IPV4_UTILS, SET3)
     ipv4_hdr_set_src_addr(hdr, 0x7f000001);
     ipv4_hdr_set_dst_addr(hdr, 0x7f000001);
     ipv4_hdr_set_opt_len(hdr, 40);
-    ipv4_hdr_set_opt_data(hdr, data3 + 20);
+    ipv4_hdr_set_opt_data(hdr, (const char *)(data3 + 20));
 
     ipv4_hdr_set_flags(hdr, 2);
     EXPECT_TRUE(memcmp(buff, data3, 60) == 0);

src/packet/test/gtest_tcp_utils.cpp

@@ -93,7 +93,7 @@ TEST(TCP_UTILS, GET)
     EXPECT_TRUE(tcp_hdr_get_checksum(hdr) == 0xfe30);
     EXPECT_TRUE(tcp_hdr_get_urg_ptr(hdr) == 0);
     EXPECT_TRUE(tcp_hdr_get_opt_len(hdr) == 20);
-    EXPECT_TRUE(tcp_hdr_get_opt_data(hdr) == data + 20);
+    EXPECT_TRUE(tcp_hdr_get_opt_data(hdr) == (const char *)(data + 20));
 }
 
 TEST(TCP_UTILS, SET1)
@@ -111,7 +111,7 @@ TEST(TCP_UTILS, SET1)
     tcp_hdr_set_checksum(hdr, 0xfe30);
     tcp_hdr_set_urg_ptr(hdr, 0);
     tcp_hdr_set_opt_len(hdr, 20);
-    tcp_hdr_set_opt_data(hdr, data + 20);
+    tcp_hdr_set_opt_data(hdr, (const char *)(data + 20));
 
     EXPECT_TRUE(memcmp(buff, data, 40) == 0);
 }
@@ -136,7 +136,7 @@ TEST(TCP_UTILS, SET2)
     tcp_hdr_set_checksum(hdr, 0xfe30);
     tcp_hdr_set_urg_ptr(hdr, 0);
     tcp_hdr_set_opt_len(hdr, 20);
-    tcp_hdr_set_opt_data(hdr, data + 20);
+    tcp_hdr_set_opt_data(hdr, (const char *)(data + 20));
 
     EXPECT_TRUE(memcmp(buff, data, 40) == 0);
 }

src/session/test/gtest_state_tcp_active_to_closing.cpp

@@ -197,7 +197,7 @@ TEST(TCP_ACTIVE_TO_CLOSING, BY_C2S_RST)
     EXPECT_TRUE(tcp_layer);
     struct tcphdr *hdr = (struct tcphdr *)tcp_layer->hdr_ptr;
     tcp_hdr_set_flags(hdr, 0);
-    tcp_hdr_set_flag_rst(hdr);
+    tcp_hdr_set_rst_flag(hdr, true);
     printf("<= packet parse\n\n");
     sess = session_manager_update_session(mgr, &pkt);
     EXPECT_TRUE(sess);
@@ -261,7 +261,7 @@ TEST(TCP_ACTIVE_TO_CLOSING, BY_S2C_RST)
     EXPECT_TRUE(tcp_layer);
     struct tcphdr *hdr = (struct tcphdr *)tcp_layer->hdr_ptr;
     tcp_hdr_set_flags(hdr, 0);
-    tcp_hdr_set_flag_rst(hdr);
+    tcp_hdr_set_rst_flag(hdr, true);
     printf("<= packet parse\n\n");
     sess = session_manager_update_session(mgr, &pkt);
     EXPECT_TRUE(sess);

src/session/test/gtest_state_tcp_opening_to_closing.cpp

@@ -163,7 +163,7 @@ TEST(TCP_OPENING_TO_CLOSING, BY_C2S_RST)
     EXPECT_TRUE(tcp_layer);
     struct tcphdr *hdr = (struct tcphdr *)tcp_layer->hdr_ptr;
     tcp_hdr_set_flags(hdr, 0);
-    tcp_hdr_set_flag_rst(hdr);
+    tcp_hdr_set_rst_flag(hdr, true);
     printf("<= packet parse\n\n");
     sess = session_manager_update_session(mgr, &pkt);
     EXPECT_TRUE(sess);
@@ -227,7 +227,7 @@ TEST(TCP_OPENING_TO_CLOSING, BY_S2C_RST)
     EXPECT_TRUE(tcp_layer);
     struct tcphdr *hdr = (struct tcphdr *)tcp_layer->hdr_ptr;
     tcp_hdr_set_flags(hdr, 0);
-    tcp_hdr_set_flag_rst(hdr);
+    tcp_hdr_set_rst_flag(hdr, true);
     printf("<= packet parse\n\n");
     sess = session_manager_update_session(mgr, &pkt);
     EXPECT_TRUE(sess);