d/numam-dpdk
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

ip_frag: add IPv6 fragmentation support

Browse Source 
Mostly a copy-paste of IPv4.

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>
This commit is contained in:
Anatoly Burakov 2014-05-28 18:32:43 +01:00 committed by Thomas Monjalon
parent 5ab22ca3ba
commit 0aa31d7a59
3 changed files with 249 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
lib/librte_ip_frag/Makefile
View File

@ -40,6 +40,7 @@ CFLAGS += $(WERROR_FLAGS) -I$(SRCDIR)
#source files
SRCS-$(CONFIG_RTE_LIBRTE_IP_FRAG) += rte_ipv4_fragmentation.c
SRCS-$(CONFIG_RTE_LIBRTE_IP_FRAG) += rte_ipv4_reassembly.c
SRCS-$(CONFIG_RTE_LIBRTE_IP_FRAG) += rte_ipv6_fragmentation.c
SRCS-$(CONFIG_RTE_LIBRTE_IP_FRAG) += rte_ip_frag_common.c
SRCS-$(CONFIG_RTE_LIBRTE_IP_FRAG) += ip_frag_internal.c

29
lib/librte_ip_frag/rte_ip_frag.h
View File

@ -173,6 +173,35 @@ rte_ip_frag_table_destroy( struct rte_ip_frag_tbl *tbl)
rte_free(tbl);
}
/**
* This function implements the fragmentation of IPv6 packets.
*
* @param pkt_in
* The input packet.
* @param pkts_out
* Array storing the output fragments.
* @param nb_pkts_out
* Number of 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);
/**
* IPv4 fragmentation.
*

219
lib/librte_ip_frag/rte_ipv6_fragmentation.c Normal file
View File

@ -0,0 +1,219 @@
/*-
* 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);
}