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/*-
* 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 <rte_memcpy.h>
#include "ip_frag_common.h"
/**
* @file
* IPv6 reassemble
*
* Implementation of IPv6 reassembly.
*
*/
static inline void
ip_frag_memmove(char *dst, char *src, int len)
{
int i;
/* go backwards to make sure we don't overwrite anything important */
for (i = len - 1; i >= 0; i--)
dst[i] = src[i];
}
/*
* Reassemble fragments into one packet.
*/
struct rte_mbuf *
ipv6_frag_reassemble(struct ip_frag_pkt *fp)
{
struct ipv6_hdr *ip_hdr;
struct ipv6_extension_fragment *frag_hdr;
struct rte_mbuf *m, *prev;
uint32_t i, n, ofs, first_len;
uint32_t last_len, move_len, payload_len;
uint32_t curr_idx = 0;
first_len = fp->frags[IP_FIRST_FRAG_IDX].len;
n = fp->last_idx - 1;
/*start from the last fragment. */
m = fp->frags[IP_LAST_FRAG_IDX].mb;
ofs = fp->frags[IP_LAST_FRAG_IDX].ofs;
last_len = fp->frags[IP_LAST_FRAG_IDX].len;
curr_idx = IP_LAST_FRAG_IDX;
payload_len = ofs + last_len;
while (ofs != first_len) {
prev = m;
for (i = n; i != IP_FIRST_FRAG_IDX && ofs != first_len; i--) {
/* previous fragment found. */
if (fp->frags[i].ofs + fp->frags[i].len == ofs) {
/* adjust start of the last fragment data. */
rte_pktmbuf_adj(m, (uint16_t)(m->l2_len + m->l3_len));
rte_pktmbuf_chain(fp->frags[i].mb, m);
/* this mbuf should not be accessed directly */
fp->frags[curr_idx].mb = NULL;
curr_idx = i;
/* update our last fragment and offset. */
m = fp->frags[i].mb;
ofs = fp->frags[i].ofs;
}
}
/* error - hole in the packet. */
if (m == prev) {
return NULL;
}
}
/* chain with the first fragment. */
rte_pktmbuf_adj(m, (uint16_t)(m->l2_len + m->l3_len));
rte_pktmbuf_chain(fp->frags[IP_FIRST_FRAG_IDX].mb, m);
m = fp->frags[IP_FIRST_FRAG_IDX].mb;
/* update mbuf fields for reassembled packet. */
m->ol_flags |= PKT_TX_IP_CKSUM;
/* update ipv6 header for the reassembled datagram */
ip_hdr = rte_pktmbuf_mtod_offset(m, struct ipv6_hdr *, m->l2_len);
ip_hdr->payload_len = rte_cpu_to_be_16(payload_len);
/*
* remove fragmentation header. note that per RFC2460, we need to update
* the last non-fragmentable header with the "next header" field to contain
* type of the first fragmentable header, but we currently don't support
* other headers, so we assume there are no other headers and thus update
* the main IPv6 header instead.
*/
move_len = m->l2_len + m->l3_len - sizeof(*frag_hdr);
frag_hdr = (struct ipv6_extension_fragment *) (ip_hdr + 1);
ip_hdr->proto = frag_hdr->next_header;
ip_frag_memmove(rte_pktmbuf_mtod_offset(m, char *, sizeof(*frag_hdr)),
rte_pktmbuf_mtod(m, char*), move_len);
rte_pktmbuf_adj(m, sizeof(*frag_hdr));
return m;
}
/*
* Process new mbuf with fragment of IPV6 datagram.
* Incoming mbuf should have its l2_len/l3_len fields setup correctly.
* @param tbl
* Table where to lookup/add the fragmented packet.
* @param mb
* Incoming mbuf with IPV6 fragment.
* @param tms
* Fragment arrival timestamp.
* @param ip_hdr
* Pointer to the IPV6 header.
* @param frag_hdr
* Pointer to the IPV6 fragment extension header.
* @return
* Pointer to mbuf for reassembled packet, or NULL if:
* - an error occurred.
* - not all fragments of the packet are collected yet.
*/
#define MORE_FRAGS(x) (((x) & 0x100) >> 8)
#define FRAG_OFFSET(x) (rte_cpu_to_be_16(x) >> 3)
struct rte_mbuf *
rte_ipv6_frag_reassemble_packet(struct rte_ip_frag_tbl *tbl,
struct rte_ip_frag_death_row *dr, struct rte_mbuf *mb, uint64_t tms,
struct ipv6_hdr *ip_hdr, struct ipv6_extension_fragment *frag_hdr)
{
struct ip_frag_pkt *fp;
struct ip_frag_key key;
uint16_t ip_len, ip_ofs;
rte_memcpy(&key.src_dst[0], ip_hdr->src_addr, 16);
rte_memcpy(&key.src_dst[2], ip_hdr->dst_addr, 16);
key.id = frag_hdr->id;
key.key_len = IPV6_KEYLEN;
ip_ofs = FRAG_OFFSET(frag_hdr->frag_data) * 8;
/*
* as per RFC2460, payload length contains all extension headers as well.
* since we don't support anything but frag headers, this is what we remove
* from the payload len.
*/
ip_len = rte_be_to_cpu_16(ip_hdr->payload_len) - sizeof(*frag_hdr);
IP_FRAG_LOG(DEBUG, "%s:%d:\n"
"mbuf: %p, tms: %" PRIu64
", key: <" IPv6_KEY_BYTES_FMT ", %#x>, ofs: %u, len: %u, flags: %#x\n"
"tbl: %p, max_cycles: %" PRIu64 ", entry_mask: %#x, "
"max_entries: %u, use_entries: %u\n\n",
__func__, __LINE__,
mb, tms, IPv6_KEY_BYTES(key.src_dst), key.id, ip_ofs, ip_len,
RTE_IPV6_GET_MF(frag_hdr->frag_data),
tbl, tbl->max_cycles, tbl->entry_mask, tbl->max_entries,
tbl->use_entries);
/* try to find/add entry into the fragment's table. */
fp = ip_frag_find(tbl, dr, &key, tms);
if (fp == NULL) {
IP_FRAG_MBUF2DR(dr, mb);
return NULL;
}
IP_FRAG_LOG(DEBUG, "%s:%d:\n"
"tbl: %p, max_entries: %u, use_entries: %u\n"
"ipv6_frag_pkt: %p, key: <" IPv6_KEY_BYTES_FMT ", %#x>, start: %" PRIu64
", total_size: %u, frag_size: %u, last_idx: %u\n\n",
__func__, __LINE__,
tbl, tbl->max_entries, tbl->use_entries,
fp, IPv6_KEY_BYTES(fp->key.src_dst), fp->key.id, fp->start,
fp->total_size, fp->frag_size, fp->last_idx);
/* process the fragmented packet. */
mb = ip_frag_process(fp, dr, mb, ip_ofs, ip_len,
MORE_FRAGS(frag_hdr->frag_data));
ip_frag_inuse(tbl, fp);
IP_FRAG_LOG(DEBUG, "%s:%d:\n"
"mbuf: %p\n"
"tbl: %p, max_entries: %u, use_entries: %u\n"
"ipv6_frag_pkt: %p, key: <" IPv6_KEY_BYTES_FMT ", %#x>, start: %" PRIu64
", total_size: %u, frag_size: %u, last_idx: %u\n\n",
__func__, __LINE__, mb,
tbl, tbl->max_entries, tbl->use_entries,
fp, IPv6_KEY_BYTES(fp->key.src_dst), fp->key.id, fp->start,
fp->total_size, fp->frag_size, fp->last_idx);
return mb;
}
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