--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stddef.h>
+
+#include <rte_memcpy.h>
+
+#include "ip_frag_common.h"
+
+/**
+ * @file
+ * IPv6 reassemble
+ *
+ * Implementation of IPv6 reassembly.
+ *
+ */
+
+static inline void
+ip_frag_memmove(char *dst, char *src, int len)
+{
+ int i;
+
+ /* go backwards to make sure we don't overwrite anything important */
+ for (i = len - 1; i >= 0; i--)
+ dst[i] = src[i];
+}
+
+/*
+ * Reassemble fragments into one packet.
+ */
+struct rte_mbuf *
+ipv6_frag_reassemble(const struct ip_frag_pkt *fp)
+{
+ struct ipv6_hdr *ip_hdr;
+ struct ipv6_extension_fragment *frag_hdr;
+ struct rte_mbuf *m, *prev;
+ uint32_t i, n, ofs, first_len;
+ uint32_t last_len, move_len, payload_len;
+
+ first_len = fp->frags[IP_FIRST_FRAG_IDX].len;
+ n = fp->last_idx - 1;
+
+ /*start from the last fragment. */
+ m = fp->frags[IP_LAST_FRAG_IDX].mb;
+ ofs = fp->frags[IP_LAST_FRAG_IDX].ofs;
+ last_len = fp->frags[IP_LAST_FRAG_IDX].len;
+
+ payload_len = ofs + last_len;
+
+ while (ofs != first_len) {
+
+ prev = m;
+
+ for (i = n; i != IP_FIRST_FRAG_IDX && ofs != first_len; i--) {
+
+ /* previous fragment found. */
+ if (fp->frags[i].ofs + fp->frags[i].len == ofs) {
+
+ /* adjust start of the last fragment data. */
+ rte_pktmbuf_adj(m, (uint16_t)(m->l2_len + m->l3_len));
+ rte_pktmbuf_chain(fp->frags[i].mb, m);
+
+ /* update our last fragment and offset. */
+ m = fp->frags[i].mb;
+ ofs = fp->frags[i].ofs;
+ }
+ }
+
+ /* error - hole in the packet. */
+ if (m == prev) {
+ return NULL;
+ }
+ }
+
+ /* chain with the first fragment. */
+ rte_pktmbuf_adj(m, (uint16_t)(m->l2_len + m->l3_len));
+ rte_pktmbuf_chain(fp->frags[IP_FIRST_FRAG_IDX].mb, m);
+ m = fp->frags[IP_FIRST_FRAG_IDX].mb;
+
+ /* update mbuf fields for reassembled packet. */
+ m->ol_flags |= PKT_TX_IP_CKSUM;
+
+ /* update ipv6 header for the reassembled datagram */
+ ip_hdr = rte_pktmbuf_mtod_offset(m, struct ipv6_hdr *, m->l2_len);
+
+ ip_hdr->payload_len = rte_cpu_to_be_16(payload_len);
+
+ /*
+ * remove fragmentation header. note that per RFC2460, we need to update
+ * the last non-fragmentable header with the "next header" field to contain
+ * type of the first fragmentable header, but we currently don't support
+ * other headers, so we assume there are no other headers and thus update
+ * the main IPv6 header instead.
+ */
+ move_len = m->l2_len + m->l3_len - sizeof(*frag_hdr);
+ frag_hdr = (struct ipv6_extension_fragment *) (ip_hdr + 1);
+ ip_hdr->proto = frag_hdr->next_header;
+
+ ip_frag_memmove(rte_pktmbuf_mtod_offset(m, char *, sizeof(*frag_hdr)),
+ rte_pktmbuf_mtod(m, char*), move_len);
+
+ rte_pktmbuf_adj(m, sizeof(*frag_hdr));
+
+ return m;
+}
+
+/*
+ * Process new mbuf with fragment of IPV6 datagram.
+ * Incoming mbuf should have its l2_len/l3_len fields setup correctly.
+ * @param tbl
+ * Table where to lookup/add the fragmented packet.
+ * @param mb
+ * Incoming mbuf with IPV6 fragment.
+ * @param tms
+ * Fragment arrival timestamp.
+ * @param ip_hdr
+ * Pointer to the IPV6 header.
+ * @param frag_hdr
+ * Pointer to the IPV6 fragment extension header.
+ * @return
+ * Pointer to mbuf for reassembled packet, or NULL if:
+ * - an error occured.
+ * - not all fragments of the packet are collected yet.
+ */
+#define MORE_FRAGS(x) (((x) & 0x100) >> 8)
+#define FRAG_OFFSET(x) (rte_cpu_to_be_16(x) >> 3)
+struct rte_mbuf *
+rte_ipv6_frag_reassemble_packet(struct rte_ip_frag_tbl *tbl,
+ struct rte_ip_frag_death_row *dr, struct rte_mbuf *mb, uint64_t tms,
+ struct ipv6_hdr *ip_hdr, struct ipv6_extension_fragment *frag_hdr)
+{
+ struct ip_frag_pkt *fp;
+ struct ip_frag_key key;
+ uint16_t ip_len, ip_ofs;
+
+ rte_memcpy(&key.src_dst[0], ip_hdr->src_addr, 16);
+ rte_memcpy(&key.src_dst[2], ip_hdr->dst_addr, 16);
+
+ key.id = frag_hdr->id;
+ key.key_len = IPV6_KEYLEN;
+
+ ip_ofs = FRAG_OFFSET(frag_hdr->frag_data) * 8;
+
+ /*
+ * as per RFC2460, payload length contains all extension headers as well.
+ * since we don't support anything but frag headers, this is what we remove
+ * from the payload len.
+ */
+ ip_len = rte_be_to_cpu_16(ip_hdr->payload_len) - sizeof(*frag_hdr);
+
+ IP_FRAG_LOG(DEBUG, "%s:%d:\n"
+ "mbuf: %p, tms: %" PRIu64
+ ", key: <" IPv6_KEY_BYTES_FMT ", %#x>, ofs: %u, len: %u, flags: %#x\n"
+ "tbl: %p, max_cycles: %" PRIu64 ", entry_mask: %#x, "
+ "max_entries: %u, use_entries: %u\n\n",
+ __func__, __LINE__,
+ mb, tms, IPv6_KEY_BYTES(key.src_dst), key.id, ip_ofs, ip_len,
+ RTE_IPV6_GET_MF(frag_hdr->frag_data),
+ tbl, tbl->max_cycles, tbl->entry_mask, tbl->max_entries,
+ tbl->use_entries);
+
+ /* try to find/add entry into the fragment's table. */
+ fp = ip_frag_find(tbl, dr, &key, tms);
+ if (fp == NULL) {
+ IP_FRAG_MBUF2DR(dr, mb);
+ return NULL;
+ }
+
+ IP_FRAG_LOG(DEBUG, "%s:%d:\n"
+ "tbl: %p, max_entries: %u, use_entries: %u\n"
+ "ipv6_frag_pkt: %p, key: <" IPv6_KEY_BYTES_FMT ", %#x>, start: %" PRIu64
+ ", total_size: %u, frag_size: %u, last_idx: %u\n\n",
+ __func__, __LINE__,
+ tbl, tbl->max_entries, tbl->use_entries,
+ fp, IPv6_KEY_BYTES(fp->key.src_dst), fp->key.id, fp->start,
+ fp->total_size, fp->frag_size, fp->last_idx);
+
+
+ /* process the fragmented packet. */
+ mb = ip_frag_process(fp, dr, mb, ip_ofs, ip_len,
+ MORE_FRAGS(frag_hdr->frag_data));
+ ip_frag_inuse(tbl, fp);
+
+ IP_FRAG_LOG(DEBUG, "%s:%d:\n"
+ "mbuf: %p\n"
+ "tbl: %p, max_entries: %u, use_entries: %u\n"
+ "ipv6_frag_pkt: %p, key: <" IPv6_KEY_BYTES_FMT ", %#x>, start: %" PRIu64
+ ", total_size: %u, frag_size: %u, last_idx: %u\n\n",
+ __func__, __LINE__, mb,
+ tbl, tbl->max_entries, tbl->use_entries,
+ fp, IPv6_KEY_BYTES(fp->key.src_dst), fp->key.id, fp->start,
+ fp->total_size, fp->frag_size, fp->last_idx);
+
+ return mb;
+}
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