253 lines
7.6 KiB
C
253 lines
7.6 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2012 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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*/
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#ifndef __INCLUDE_RTE_IPV4_FRAG_H__
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#define __INCLUDE_RTE_IPV4_FRAG_H__
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#include <rte_ip.h>
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/**
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* @file
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* RTE IPv4 Fragmentation
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*
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* Implementation of IPv4 fragmentation.
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*
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*/
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/*
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* Default byte size for the IPv4 Maximum Transfer Unit (MTU).
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* This value includes the size of IPv4 header.
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*/
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#define IPV4_MTU_DEFAULT ETHER_MTU
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/*
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* Default payload in bytes for the IPv4 packet.
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*/
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#define IPV4_DEFAULT_PAYLOAD (IPV4_MTU_DEFAULT - sizeof(struct ipv4_hdr))
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/*
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* MAX number of fragments per packet allowed.
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*/
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#define IPV4_MAX_FRAGS_PER_PACKET 0x80
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/* Debug on/off */
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#ifdef RTE_IPV4_FRAG_DEBUG
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#define RTE_IPV4_FRAG_ASSERT(exp) \
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if (!(exp)) { \
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rte_panic("function %s, line%d\tassert \"" #exp "\" failed\n", \
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__func__, __LINE__); \
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}
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#else /*RTE_IPV4_FRAG_DEBUG*/
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#define RTE_IPV4_FRAG_ASSERT(exp) do { } while(0)
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#endif /*RTE_IPV4_FRAG_DEBUG*/
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/* Fragment Offset */
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#define IPV4_HDR_DF_SHIFT 14
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#define IPV4_HDR_MF_SHIFT 13
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#define IPV4_HDR_FO_SHIFT 3
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#define IPV4_HDR_DF_MASK (1 << IPV4_HDR_DF_SHIFT)
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#define IPV4_HDR_MF_MASK (1 << IPV4_HDR_MF_SHIFT)
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#define IPV4_HDR_FO_MASK ((1 << IPV4_HDR_FO_SHIFT) - 1)
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static inline void __fill_ipv4hdr_frag(struct ipv4_hdr *dst,
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const struct ipv4_hdr *src, uint16_t len, uint16_t fofs,
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uint16_t dofs, uint32_t mf)
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{
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rte_memcpy(dst, src, sizeof(*dst));
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fofs = (uint16_t)(fofs + (dofs >> IPV4_HDR_FO_SHIFT));
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fofs = (uint16_t)(fofs | mf << IPV4_HDR_MF_SHIFT);
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dst->fragment_offset = rte_cpu_to_be_16(fofs);
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dst->total_length = rte_cpu_to_be_16(len);
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dst->hdr_checksum = 0;
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}
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static inline void __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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* IPv4 fragmentation.
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*
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* This function implements the fragmentation of IPv4 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 IPv4
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* datagrams. This value includes the size of the IPv4 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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static inline int32_t rte_ipv4_fragmentation(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 ipv4_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, flag_offset, frag_size;
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frag_size = (uint16_t)(mtu_size - sizeof(struct ipv4_hdr));
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/* Fragment size should be a multiply of 8. */
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RTE_IPV4_FRAG_ASSERT((frag_size & IPV4_HDR_FO_MASK) == 0);
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/* Fragment size should be a multiply of 8. */
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RTE_IPV4_FRAG_ASSERT(IPV4_MAX_FRAGS_PER_PACKET * frag_size >=
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(uint16_t)(pkt_in->pkt.pkt_len - sizeof (struct ipv4_hdr)));
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in_hdr = (struct ipv4_hdr*) pkt_in->pkt.data;
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flag_offset = rte_cpu_to_be_16(in_hdr->fragment_offset);
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/* If Don't Fragment flag is set */
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if (unlikely ((flag_offset & IPV4_HDR_DF_MASK) != 0))
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return (-ENOTSUP);
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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.pkt_len - sizeof (struct ipv4_hdr))))
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return (-EINVAL);
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in_seg = pkt_in;
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in_seg_data_pos = sizeof(struct ipv4_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 ipv4_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->pkt.data_len = sizeof(struct ipv4_hdr);
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out_pkt->pkt.pkt_len = sizeof(struct ipv4_hdr);
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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->pkt.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.pkt_len;
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if (len > (in_seg->pkt.data_len - in_seg_data_pos)) {
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len = in_seg->pkt.data_len - in_seg_data_pos;
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}
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out_seg->pkt.data = (char*) in_seg->pkt.data + (uint16_t)in_seg_data_pos;
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out_seg->pkt.data_len = (uint16_t)len;
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out_pkt->pkt.pkt_len = (uint16_t)(len +
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out_pkt->pkt.pkt_len);
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out_pkt->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.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->pkt.data_len)) {
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in_seg = in_seg->pkt.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 = (struct ipv4_hdr*) out_pkt->pkt.data;
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__fill_ipv4hdr_frag(out_hdr, in_hdr,
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(uint16_t)out_pkt->pkt.pkt_len,
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flag_offset, fragment_offset, more_in_segs);
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fragment_offset = (uint16_t)(fragment_offset +
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out_pkt->pkt.pkt_len - sizeof(struct ipv4_hdr));
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out_pkt->ol_flags |= PKT_TX_IP_CKSUM;
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out_pkt->pkt.vlan_macip.f.l3_len = sizeof(struct ipv4_hdr);
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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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#endif
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