--- /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 <stdint.h>
+#include <errno.h>
+
+#include <rte_byteorder.h>
+#include <rte_memcpy.h>
+#include <rte_ip.h>
+
+#include "rte_ip_frag.h"
+#include "ip_frag_common.h"
+
+/**
+ * @file
+ * RTE IPv6 Fragmentation
+ *
+ * Implementation of IPv6 fragmentation.
+ *
+ */
+
+/* Fragment Extension Header */
+#define IPV6_HDR_MF_SHIFT 0
+#define IPV6_HDR_FO_SHIFT 3
+#define IPV6_HDR_MF_MASK (1 << IPV6_HDR_MF_SHIFT)
+#define IPV6_HDR_FO_MASK ((1 << IPV6_HDR_FO_SHIFT) - 1)
+
+static inline void
+__fill_ipv6hdr_frag(struct ipv6_hdr *dst,
+ const struct ipv6_hdr *src, uint16_t len, uint16_t fofs,
+ uint32_t mf)
+{
+ struct ipv6_extension_fragment *fh;
+
+ rte_memcpy(dst, src, sizeof(*dst));
+ dst->payload_len = rte_cpu_to_be_16(len);
+ dst->proto = IPPROTO_FRAGMENT;
+
+ fh = (struct ipv6_extension_fragment *) ++dst;
+ fh->next_header = src->proto;
+ fh->reserved1 = 0;
+ fh->frag_offset = rte_cpu_to_be_16(fofs);
+ fh->reserved2 = 0;
+ fh->more_frags = rte_cpu_to_be_16(mf);
+ fh->id = 0;
+}
+
+static inline void
+__free_fragments(struct rte_mbuf *mb[], uint32_t num)
+{
+ uint32_t i;
+ for (i = 0; i < num; i++)
+ rte_pktmbuf_free(mb[i]);
+}
+
+/**
+ * IPv6 fragmentation.
+ *
+ * This function implements the fragmentation of IPv6 packets.
+ *
+ * @param pkt_in
+ * The input packet.
+ * @param pkts_out
+ * Array storing the output fragments.
+ * @param mtu_size
+ * Size in bytes of the Maximum Transfer Unit (MTU) for the outgoing IPv6
+ * datagrams. This value includes the size of the IPv6 header.
+ * @param pool_direct
+ * MBUF pool used for allocating direct buffers for the output fragments.
+ * @param pool_indirect
+ * MBUF pool used for allocating indirect buffers for the output fragments.
+ * @return
+ * Upon successful completion - number of output fragments placed
+ * in the pkts_out array.
+ * Otherwise - (-1) * <errno>.
+ */
+int32_t
+rte_ipv6_fragment_packet(struct rte_mbuf *pkt_in,
+ struct rte_mbuf **pkts_out,
+ uint16_t nb_pkts_out,
+ uint16_t mtu_size,
+ struct rte_mempool *pool_direct,
+ struct rte_mempool *pool_indirect)
+{
+ struct rte_mbuf *in_seg = NULL;
+ struct ipv6_hdr *in_hdr;
+ uint32_t out_pkt_pos, in_seg_data_pos;
+ uint32_t more_in_segs;
+ uint16_t fragment_offset, frag_size;
+
+ frag_size = (uint16_t)(mtu_size - sizeof(struct ipv6_hdr));
+
+ /* Fragment size should be a multiple of 8. */
+ RTE_IP_FRAG_ASSERT((frag_size & IPV6_HDR_FO_MASK) == 0);
+
+ /* Check that pkts_out is big enough to hold all fragments */
+ if (unlikely (frag_size * nb_pkts_out <
+ (uint16_t)(pkt_in->pkt.pkt_len - sizeof (struct ipv6_hdr))))
+ return (-EINVAL);
+
+ in_hdr = (struct ipv6_hdr *) pkt_in->pkt.data;
+
+ in_seg = pkt_in;
+ in_seg_data_pos = sizeof(struct ipv6_hdr);
+ out_pkt_pos = 0;
+ fragment_offset = 0;
+
+ more_in_segs = 1;
+ while (likely(more_in_segs)) {
+ struct rte_mbuf *out_pkt = NULL, *out_seg_prev = NULL;
+ uint32_t more_out_segs;
+ struct ipv6_hdr *out_hdr;
+
+ /* Allocate direct buffer */
+ out_pkt = rte_pktmbuf_alloc(pool_direct);
+ if (unlikely(out_pkt == NULL)) {
+ __free_fragments(pkts_out, out_pkt_pos);
+ return (-ENOMEM);
+ }
+
+ /* Reserve space for the IP header that will be built later */
+ out_pkt->pkt.data_len = sizeof(struct ipv6_hdr) + sizeof(struct ipv6_extension_fragment);
+ out_pkt->pkt.pkt_len = sizeof(struct ipv6_hdr) + sizeof(struct ipv6_extension_fragment);
+
+ out_seg_prev = out_pkt;
+ more_out_segs = 1;
+ while (likely(more_out_segs && more_in_segs)) {
+ struct rte_mbuf *out_seg = NULL;
+ uint32_t len;
+
+ /* Allocate indirect buffer */
+ out_seg = rte_pktmbuf_alloc(pool_indirect);
+ if (unlikely(out_seg == NULL)) {
+ rte_pktmbuf_free(out_pkt);
+ __free_fragments(pkts_out, out_pkt_pos);
+ return (-ENOMEM);
+ }
+ out_seg_prev->pkt.next = out_seg;
+ out_seg_prev = out_seg;
+
+ /* Prepare indirect buffer */
+ rte_pktmbuf_attach(out_seg, in_seg);
+ len = mtu_size - out_pkt->pkt.pkt_len;
+ if (len > (in_seg->pkt.data_len - in_seg_data_pos)) {
+ len = in_seg->pkt.data_len - in_seg_data_pos;
+ }
+ out_seg->pkt.data = (char *) in_seg->pkt.data + (uint16_t) in_seg_data_pos;
+ out_seg->pkt.data_len = (uint16_t)len;
+ out_pkt->pkt.pkt_len = (uint16_t)(len +
+ out_pkt->pkt.pkt_len);
+ out_pkt->pkt.nb_segs += 1;
+ in_seg_data_pos += len;
+
+ /* Current output packet (i.e. fragment) done ? */
+ if (unlikely(out_pkt->pkt.pkt_len >= mtu_size)) {
+ more_out_segs = 0;
+ }
+
+ /* Current input segment done ? */
+ if (unlikely(in_seg_data_pos == in_seg->pkt.data_len)) {
+ in_seg = in_seg->pkt.next;
+ in_seg_data_pos = 0;
+
+ if (unlikely(in_seg == NULL)) {
+ more_in_segs = 0;
+ }
+ }
+ }
+
+ /* Build the IP header */
+
+ out_hdr = (struct ipv6_hdr *) out_pkt->pkt.data;
+
+ __fill_ipv6hdr_frag(out_hdr, in_hdr,
+ (uint16_t) out_pkt->pkt.pkt_len - sizeof(struct ipv6_hdr),
+ fragment_offset, more_in_segs);
+
+ fragment_offset = (uint16_t)(fragment_offset +
+ out_pkt->pkt.pkt_len - sizeof(struct ipv6_hdr)
+ - sizeof(struct ipv6_extension_fragment));
+
+ /* Write the fragment to the output list */
+ pkts_out[out_pkt_pos] = out_pkt;
+ out_pkt_pos ++;
+ }
+
+ return (out_pkt_pos);
+}
git.droids-corp.org / dpdk.git / commitdiff