--- /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 <errno.h>
+
+#include <rte_memcpy.h>
+#include <rte_mempool.h>
+#include <rte_debug.h>
+
+#include "ip_frag_common.h"
+
+/* Fragment Offset */
+#define IPV4_HDR_DF_SHIFT 14
+#define IPV4_HDR_MF_SHIFT 13
+#define IPV4_HDR_FO_SHIFT 3
+
+#define IPV4_HDR_DF_MASK (1 << IPV4_HDR_DF_SHIFT)
+#define IPV4_HDR_MF_MASK (1 << IPV4_HDR_MF_SHIFT)
+
+#define IPV4_HDR_FO_MASK ((1 << IPV4_HDR_FO_SHIFT) - 1)
+
+static inline void __fill_ipv4hdr_frag(struct ipv4_hdr *dst,
+ const struct ipv4_hdr *src, uint16_t len, uint16_t fofs,
+ uint16_t dofs, uint32_t mf)
+{
+ rte_memcpy(dst, src, sizeof(*dst));
+ fofs = (uint16_t)(fofs + (dofs >> IPV4_HDR_FO_SHIFT));
+ fofs = (uint16_t)(fofs | mf << IPV4_HDR_MF_SHIFT);
+ dst->fragment_offset = rte_cpu_to_be_16(fofs);
+ dst->total_length = rte_cpu_to_be_16(len);
+ dst->hdr_checksum = 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]);
+}
+
+/**
+ * IPv4 fragmentation.
+ *
+ * This function implements the fragmentation of IPv4 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 IPv4
+ * datagrams. This value includes the size of the IPv4 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_ipv4_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 ipv4_hdr *in_hdr;
+ uint32_t out_pkt_pos, in_seg_data_pos;
+ uint32_t more_in_segs;
+ uint16_t fragment_offset, flag_offset, frag_size;
+
+ frag_size = (uint16_t)(mtu_size - sizeof(struct ipv4_hdr));
+
+ /* Fragment size should be a multiply of 8. */
+ IP_FRAG_ASSERT((frag_size & IPV4_HDR_FO_MASK) == 0);
+
+ in_hdr = rte_pktmbuf_mtod(pkt_in, struct ipv4_hdr *);
+ flag_offset = rte_cpu_to_be_16(in_hdr->fragment_offset);
+
+ /* If Don't Fragment flag is set */
+ if (unlikely ((flag_offset & IPV4_HDR_DF_MASK) != 0))
+ return -ENOTSUP;
+
+ /* Check that pkts_out is big enough to hold all fragments */
+ if (unlikely(frag_size * nb_pkts_out <
+ (uint16_t)(pkt_in->pkt_len - sizeof (struct ipv4_hdr))))
+ return -EINVAL;
+
+ in_seg = pkt_in;
+ in_seg_data_pos = sizeof(struct ipv4_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 ipv4_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->data_len = sizeof(struct ipv4_hdr);
+ out_pkt->pkt_len = sizeof(struct ipv4_hdr);
+
+ 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->next = out_seg;
+ out_seg_prev = out_seg;
+
+ /* Prepare indirect buffer */
+ rte_pktmbuf_attach(out_seg, in_seg);
+ len = mtu_size - out_pkt->pkt_len;
+ if (len > (in_seg->data_len - in_seg_data_pos)) {
+ len = in_seg->data_len - in_seg_data_pos;
+ }
+ out_seg->data_off = in_seg->data_off + in_seg_data_pos;
+ out_seg->data_len = (uint16_t)len;
+ out_pkt->pkt_len = (uint16_t)(len +
+ out_pkt->pkt_len);
+ out_pkt->nb_segs += 1;
+ in_seg_data_pos += len;
+
+ /* Current output packet (i.e. fragment) done ? */
+ if (unlikely(out_pkt->pkt_len >= mtu_size))
+ more_out_segs = 0;
+
+ /* Current input segment done ? */
+ if (unlikely(in_seg_data_pos == in_seg->data_len)) {
+ in_seg = in_seg->next;
+ in_seg_data_pos = 0;
+
+ if (unlikely(in_seg == NULL))
+ more_in_segs = 0;
+ }
+ }
+
+ /* Build the IP header */
+
+ out_hdr = rte_pktmbuf_mtod(out_pkt, struct ipv4_hdr *);
+
+ __fill_ipv4hdr_frag(out_hdr, in_hdr,
+ (uint16_t)out_pkt->pkt_len,
+ flag_offset, fragment_offset, more_in_segs);
+
+ fragment_offset = (uint16_t)(fragment_offset +
+ out_pkt->pkt_len - sizeof(struct ipv4_hdr));
+
+ out_pkt->ol_flags |= PKT_TX_IP_CKSUM;
+ out_pkt->l3_len = sizeof(struct ipv4_hdr);
+
+ /* Write the fragment to the output list */
+ pkts_out[out_pkt_pos] = out_pkt;
+ out_pkt_pos ++;
+ }
+
+ return out_pkt_pos;
+}
Code Review / deb_dpdk.git / blobdiff