1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
8 #include <rte_memcpy.h>
10 #include "ip_frag_common.h"
14 * RTE IPv6 Fragmentation
16 * Implementation of IPv6 fragmentation.
21 __fill_ipv6hdr_frag(struct rte_ipv6_hdr *dst,
22 const struct rte_ipv6_hdr *src, uint16_t len, uint16_t fofs,
25 struct rte_ipv6_fragment_ext *fh;
27 rte_memcpy(dst, src, sizeof(*dst));
28 dst->payload_len = rte_cpu_to_be_16(len);
29 dst->proto = IPPROTO_FRAGMENT;
31 fh = (struct rte_ipv6_fragment_ext *) ++dst;
32 fh->next_header = src->proto;
34 fh->frag_data = rte_cpu_to_be_16(RTE_IPV6_SET_FRAG_DATA(fofs, mf));
39 __free_fragments(struct rte_mbuf *mb[], uint32_t num)
42 for (i = 0; i < num; i++)
43 rte_pktmbuf_free(mb[i]);
49 * This function implements the fragmentation of IPv6 packets.
54 * Array storing the output fragments.
56 * Size in bytes of the Maximum Transfer Unit (MTU) for the outgoing IPv6
57 * datagrams. This value includes the size of the IPv6 header.
59 * MBUF pool used for allocating direct buffers for the output fragments.
60 * @param pool_indirect
61 * MBUF pool used for allocating indirect buffers for the output fragments.
63 * Upon successful completion - number of output fragments placed
64 * in the pkts_out array.
65 * Otherwise - (-1) * <errno>.
68 rte_ipv6_fragment_packet(struct rte_mbuf *pkt_in,
69 struct rte_mbuf **pkts_out,
72 struct rte_mempool *pool_direct,
73 struct rte_mempool *pool_indirect)
75 struct rte_mbuf *in_seg = NULL;
76 struct rte_ipv6_hdr *in_hdr;
77 uint32_t out_pkt_pos, in_seg_data_pos;
78 uint32_t more_in_segs;
79 uint16_t fragment_offset, frag_size;
80 uint64_t frag_bytes_remaining;
83 * Formal parameter checking.
85 if (unlikely(pkt_in == NULL) || unlikely(pkts_out == NULL) ||
86 unlikely(nb_pkts_out == 0) ||
87 unlikely(pool_direct == NULL) || unlikely(pool_indirect == NULL) ||
88 unlikely(mtu_size < RTE_IPV6_MIN_MTU))
92 * Ensure the IP payload length of all fragments (except the
93 * last fragment) are a multiple of 8 bytes per RFC2460.
96 frag_size = mtu_size - sizeof(struct rte_ipv6_hdr) -
97 sizeof(struct rte_ipv6_fragment_ext);
98 frag_size = RTE_ALIGN_FLOOR(frag_size, RTE_IPV6_EHDR_FO_ALIGN);
100 /* Check that pkts_out is big enough to hold all fragments */
101 if (unlikely (frag_size * nb_pkts_out <
102 (uint16_t)(pkt_in->pkt_len - sizeof(struct rte_ipv6_hdr))))
105 in_hdr = rte_pktmbuf_mtod(pkt_in, struct rte_ipv6_hdr *);
108 in_seg_data_pos = sizeof(struct rte_ipv6_hdr);
113 while (likely(more_in_segs)) {
114 struct rte_mbuf *out_pkt = NULL, *out_seg_prev = NULL;
115 uint32_t more_out_segs;
116 struct rte_ipv6_hdr *out_hdr;
118 /* Allocate direct buffer */
119 out_pkt = rte_pktmbuf_alloc(pool_direct);
120 if (unlikely(out_pkt == NULL)) {
121 __free_fragments(pkts_out, out_pkt_pos);
125 /* Reserve space for the IP header that will be built later */
126 out_pkt->data_len = sizeof(struct rte_ipv6_hdr) +
127 sizeof(struct rte_ipv6_fragment_ext);
128 out_pkt->pkt_len = sizeof(struct rte_ipv6_hdr) +
129 sizeof(struct rte_ipv6_fragment_ext);
130 frag_bytes_remaining = frag_size;
132 out_seg_prev = out_pkt;
134 while (likely(more_out_segs && more_in_segs)) {
135 struct rte_mbuf *out_seg = NULL;
138 /* Allocate indirect buffer */
139 out_seg = rte_pktmbuf_alloc(pool_indirect);
140 if (unlikely(out_seg == NULL)) {
141 rte_pktmbuf_free(out_pkt);
142 __free_fragments(pkts_out, out_pkt_pos);
145 out_seg_prev->next = out_seg;
146 out_seg_prev = out_seg;
148 /* Prepare indirect buffer */
149 rte_pktmbuf_attach(out_seg, in_seg);
150 len = frag_bytes_remaining;
151 if (len > (in_seg->data_len - in_seg_data_pos)) {
152 len = in_seg->data_len - in_seg_data_pos;
154 out_seg->data_off = in_seg->data_off + in_seg_data_pos;
155 out_seg->data_len = (uint16_t)len;
156 out_pkt->pkt_len = (uint16_t)(len +
158 out_pkt->nb_segs += 1;
159 in_seg_data_pos += len;
160 frag_bytes_remaining -= len;
162 /* Current output packet (i.e. fragment) done ? */
163 if (unlikely(frag_bytes_remaining == 0))
166 /* Current input segment done ? */
167 if (unlikely(in_seg_data_pos == in_seg->data_len)) {
168 in_seg = in_seg->next;
171 if (unlikely(in_seg == NULL)) {
177 /* Build the IP header */
179 out_hdr = rte_pktmbuf_mtod(out_pkt, struct rte_ipv6_hdr *);
181 __fill_ipv6hdr_frag(out_hdr, in_hdr,
182 (uint16_t) out_pkt->pkt_len - sizeof(struct rte_ipv6_hdr),
183 fragment_offset, more_in_segs);
185 fragment_offset = (uint16_t)(fragment_offset +
186 out_pkt->pkt_len - sizeof(struct rte_ipv6_hdr)
187 - sizeof(struct rte_ipv6_fragment_ext));
189 /* Write the fragment to the output list */
190 pkts_out[out_pkt_pos] = out_pkt;