diff options
Diffstat (limited to 'lib/librte_ip_frag/rte_ipv6_fragmentation.c')
| -rw-r--r-- | lib/librte_ip_frag/rte_ipv6_fragmentation.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/lib/librte_ip_frag/rte_ipv6_fragmentation.c b/lib/librte_ip_frag/rte_ipv6_fragmentation.c new file mode 100644 index 00000000..1e30004f --- /dev/null +++ b/lib/librte_ip_frag/rte_ipv6_fragmentation.c @@ -0,0 +1,207 @@ +/*- + * 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 <errno.h> + +#include <rte_memcpy.h> + +#include "ip_frag_common.h" + +/** + * @file + * RTE IPv6 Fragmentation + * + * Implementation of IPv6 fragmentation. + * + */ + +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->reserved = 0; + fh->frag_data = rte_cpu_to_be_16(RTE_IPV6_SET_FRAG_DATA(fofs, 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. */ + IP_FRAG_ASSERT((frag_size & ~RTE_IPV6_EHDR_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_len - sizeof (struct ipv6_hdr)))) + return -EINVAL; + + in_hdr = rte_pktmbuf_mtod(pkt_in, struct ipv6_hdr *); + + 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->data_len = sizeof(struct ipv6_hdr) + sizeof(struct ipv6_extension_fragment); + out_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->next = out_seg; + out_seg_prev = out_seg; + + /* Prepare indirect buffer */ + rte_pktmbuf_attach(out_seg, in_seg); + len = mtu_size - out_pkt->pkt_len; + if (len > (in_seg->data_len - in_seg_data_pos)) { + len = in_seg->data_len - in_seg_data_pos; + } + out_seg->data_off = in_seg->data_off + in_seg_data_pos; + out_seg->data_len = (uint16_t)len; + out_pkt->pkt_len = (uint16_t)(len + + out_pkt->pkt_len); + out_pkt->nb_segs += 1; + in_seg_data_pos += len; + + /* Current output packet (i.e. fragment) done ? */ + if (unlikely(out_pkt->pkt_len >= mtu_size)) { + more_out_segs = 0; + } + + /* Current input segment done ? */ + if (unlikely(in_seg_data_pos == in_seg->data_len)) { + in_seg = in_seg->next; + in_seg_data_pos = 0; + + if (unlikely(in_seg == NULL)) { + more_in_segs = 0; + } + } + } + + /* Build the IP header */ + + out_hdr = rte_pktmbuf_mtod(out_pkt, struct ipv6_hdr *); + + __fill_ipv6hdr_frag(out_hdr, in_hdr, + (uint16_t) out_pkt->pkt_len - sizeof(struct ipv6_hdr), + fragment_offset, more_in_segs); + + fragment_offset = (uint16_t)(fragment_offset + + out_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; +} |