1 files changed, 225 insertions, 0 deletions
diff --git a/lib/librte_ip_frag/rte_ipv6_reassembly.c b/lib/librte_ip_frag/rte_ipv6_reassembly.c
new file mode 100644
index 00000000..d29cb1da
--- /dev/null
+++ b/lib/librte_ip_frag/rte_ipv6_reassembly.c
@@ -0,0 +1,225 @@
+/*-
+ *   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;
+}