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 ipv6_hdr *dst,
22 const struct ipv6_hdr *src, uint16_t len, uint16_t fofs,
25 struct ipv6_extension_fragment *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 ipv6_extension_fragment *) ++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 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;
81 frag_size = (uint16_t)(mtu_size - sizeof(struct ipv6_hdr));
83 /* Fragment size should be a multiple of 8. */
84 RTE_ASSERT((frag_size & ~RTE_IPV6_EHDR_FO_MASK) == 0);
86 /* Check that pkts_out is big enough to hold all fragments */
87 if (unlikely (frag_size * nb_pkts_out <
88 (uint16_t)(pkt_in->pkt_len - sizeof (struct ipv6_hdr))))
91 in_hdr = rte_pktmbuf_mtod(pkt_in, struct ipv6_hdr *);
94 in_seg_data_pos = sizeof(struct ipv6_hdr);
99 while (likely(more_in_segs)) {
100 struct rte_mbuf *out_pkt = NULL, *out_seg_prev = NULL;
101 uint32_t more_out_segs;
102 struct ipv6_hdr *out_hdr;
104 /* Allocate direct buffer */
105 out_pkt = rte_pktmbuf_alloc(pool_direct);
106 if (unlikely(out_pkt == NULL)) {
107 __free_fragments(pkts_out, out_pkt_pos);
111 /* Reserve space for the IP header that will be built later */
112 out_pkt->data_len = sizeof(struct ipv6_hdr) + sizeof(struct ipv6_extension_fragment);
113 out_pkt->pkt_len = sizeof(struct ipv6_hdr) + sizeof(struct ipv6_extension_fragment);
115 out_seg_prev = out_pkt;
117 while (likely(more_out_segs && more_in_segs)) {
118 struct rte_mbuf *out_seg = NULL;
121 /* Allocate indirect buffer */
122 out_seg = rte_pktmbuf_alloc(pool_indirect);
123 if (unlikely(out_seg == NULL)) {
124 rte_pktmbuf_free(out_pkt);
125 __free_fragments(pkts_out, out_pkt_pos);
128 out_seg_prev->next = out_seg;
129 out_seg_prev = out_seg;
131 /* Prepare indirect buffer */
132 rte_pktmbuf_attach(out_seg, in_seg);
133 len = mtu_size - out_pkt->pkt_len;
134 if (len > (in_seg->data_len - in_seg_data_pos)) {
135 len = in_seg->data_len - in_seg_data_pos;
137 out_seg->data_off = in_seg->data_off + in_seg_data_pos;
138 out_seg->data_len = (uint16_t)len;
139 out_pkt->pkt_len = (uint16_t)(len +
141 out_pkt->nb_segs += 1;
142 in_seg_data_pos += len;
144 /* Current output packet (i.e. fragment) done ? */
145 if (unlikely(out_pkt->pkt_len >= mtu_size)) {
149 /* Current input segment done ? */
150 if (unlikely(in_seg_data_pos == in_seg->data_len)) {
151 in_seg = in_seg->next;
154 if (unlikely(in_seg == NULL)) {
160 /* Build the IP header */
162 out_hdr = rte_pktmbuf_mtod(out_pkt, struct ipv6_hdr *);
164 __fill_ipv6hdr_frag(out_hdr, in_hdr,
165 (uint16_t) out_pkt->pkt_len - sizeof(struct ipv6_hdr),
166 fragment_offset, more_in_segs);
168 fragment_offset = (uint16_t)(fragment_offset +
169 out_pkt->pkt_len - sizeof(struct ipv6_hdr)
170 - sizeof(struct ipv6_extension_fragment));
172 /* Write the fragment to the output list */
173 pkts_out[out_pkt_pos] = out_pkt;