diff options
Diffstat (limited to 'lib/librte_ip_frag/rte_ipv6_reassembly.c')
| -rw-r--r-- | lib/librte_ip_frag/rte_ipv6_reassembly.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/lib/librte_ip_frag/rte_ipv6_reassembly.c b/lib/librte_ip_frag/rte_ipv6_reassembly.c new file mode 100644 index 00000000..d29cb1da --- /dev/null +++ b/lib/librte_ip_frag/rte_ipv6_reassembly.c @@ -0,0 +1,225 @@ +/*- + * 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(const 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; + + 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; + + 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); + + /* 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 occured. + * - 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; +} |