208 lines
6.2 KiB
C
208 lines
6.2 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stddef.h>
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#include <errno.h>
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#include <rte_memcpy.h>
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#include "ip_frag_common.h"
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/**
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* @file
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* RTE IPv6 Fragmentation
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*
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* Implementation of IPv6 fragmentation.
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*
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*/
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static inline void
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__fill_ipv6hdr_frag(struct ipv6_hdr *dst,
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const struct ipv6_hdr *src, uint16_t len, uint16_t fofs,
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uint32_t mf)
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{
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struct ipv6_extension_fragment *fh;
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rte_memcpy(dst, src, sizeof(*dst));
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dst->payload_len = rte_cpu_to_be_16(len);
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dst->proto = IPPROTO_FRAGMENT;
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fh = (struct ipv6_extension_fragment *) ++dst;
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fh->next_header = src->proto;
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fh->reserved = 0;
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fh->frag_data = rte_cpu_to_be_16(RTE_IPV6_SET_FRAG_DATA(fofs, mf));
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fh->id = 0;
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}
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static inline void
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__free_fragments(struct rte_mbuf *mb[], uint32_t num)
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{
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uint32_t i;
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for (i = 0; i < num; i++)
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rte_pktmbuf_free(mb[i]);
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}
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/**
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* IPv6 fragmentation.
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*
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* This function implements the fragmentation of IPv6 packets.
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*
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* @param pkt_in
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* The input packet.
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* @param pkts_out
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* Array storing the output fragments.
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* @param mtu_size
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* Size in bytes of the Maximum Transfer Unit (MTU) for the outgoing IPv6
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* datagrams. This value includes the size of the IPv6 header.
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* @param pool_direct
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* MBUF pool used for allocating direct buffers for the output fragments.
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* @param pool_indirect
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* MBUF pool used for allocating indirect buffers for the output fragments.
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* @return
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* Upon successful completion - number of output fragments placed
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* in the pkts_out array.
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* Otherwise - (-1) * <errno>.
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*/
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int32_t
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rte_ipv6_fragment_packet(struct rte_mbuf *pkt_in,
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struct rte_mbuf **pkts_out,
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uint16_t nb_pkts_out,
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uint16_t mtu_size,
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struct rte_mempool *pool_direct,
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struct rte_mempool *pool_indirect)
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{
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struct rte_mbuf *in_seg = NULL;
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struct ipv6_hdr *in_hdr;
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uint32_t out_pkt_pos, in_seg_data_pos;
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uint32_t more_in_segs;
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uint16_t fragment_offset, frag_size;
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frag_size = (uint16_t)(mtu_size - sizeof(struct ipv6_hdr));
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/* Fragment size should be a multiple of 8. */
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RTE_ASSERT((frag_size & ~RTE_IPV6_EHDR_FO_MASK) == 0);
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/* Check that pkts_out is big enough to hold all fragments */
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if (unlikely (frag_size * nb_pkts_out <
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(uint16_t)(pkt_in->pkt_len - sizeof (struct ipv6_hdr))))
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return -EINVAL;
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in_hdr = rte_pktmbuf_mtod(pkt_in, struct ipv6_hdr *);
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in_seg = pkt_in;
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in_seg_data_pos = sizeof(struct ipv6_hdr);
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out_pkt_pos = 0;
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fragment_offset = 0;
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more_in_segs = 1;
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while (likely(more_in_segs)) {
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struct rte_mbuf *out_pkt = NULL, *out_seg_prev = NULL;
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uint32_t more_out_segs;
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struct ipv6_hdr *out_hdr;
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/* Allocate direct buffer */
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out_pkt = rte_pktmbuf_alloc(pool_direct);
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if (unlikely(out_pkt == NULL)) {
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__free_fragments(pkts_out, out_pkt_pos);
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return -ENOMEM;
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}
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/* Reserve space for the IP header that will be built later */
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out_pkt->data_len = sizeof(struct ipv6_hdr) + sizeof(struct ipv6_extension_fragment);
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out_pkt->pkt_len = sizeof(struct ipv6_hdr) + sizeof(struct ipv6_extension_fragment);
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out_seg_prev = out_pkt;
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more_out_segs = 1;
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while (likely(more_out_segs && more_in_segs)) {
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struct rte_mbuf *out_seg = NULL;
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uint32_t len;
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/* Allocate indirect buffer */
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out_seg = rte_pktmbuf_alloc(pool_indirect);
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if (unlikely(out_seg == NULL)) {
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rte_pktmbuf_free(out_pkt);
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__free_fragments(pkts_out, out_pkt_pos);
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return -ENOMEM;
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}
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out_seg_prev->next = out_seg;
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out_seg_prev = out_seg;
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/* Prepare indirect buffer */
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rte_pktmbuf_attach(out_seg, in_seg);
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len = mtu_size - out_pkt->pkt_len;
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if (len > (in_seg->data_len - in_seg_data_pos)) {
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len = in_seg->data_len - in_seg_data_pos;
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}
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out_seg->data_off = in_seg->data_off + in_seg_data_pos;
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out_seg->data_len = (uint16_t)len;
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out_pkt->pkt_len = (uint16_t)(len +
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out_pkt->pkt_len);
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out_pkt->nb_segs += 1;
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in_seg_data_pos += len;
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/* Current output packet (i.e. fragment) done ? */
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if (unlikely(out_pkt->pkt_len >= mtu_size)) {
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more_out_segs = 0;
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}
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/* Current input segment done ? */
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if (unlikely(in_seg_data_pos == in_seg->data_len)) {
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in_seg = in_seg->next;
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in_seg_data_pos = 0;
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if (unlikely(in_seg == NULL)) {
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more_in_segs = 0;
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}
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}
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}
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/* Build the IP header */
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out_hdr = rte_pktmbuf_mtod(out_pkt, struct ipv6_hdr *);
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__fill_ipv6hdr_frag(out_hdr, in_hdr,
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(uint16_t) out_pkt->pkt_len - sizeof(struct ipv6_hdr),
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fragment_offset, more_in_segs);
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fragment_offset = (uint16_t)(fragment_offset +
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out_pkt->pkt_len - sizeof(struct ipv6_hdr)
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- sizeof(struct ipv6_extension_fragment));
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/* Write the fragment to the output list */
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pkts_out[out_pkt_pos] = out_pkt;
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out_pkt_pos ++;
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}
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return out_pkt_pos;
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}
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