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37 #include <rte_memcpy.h>
39 #include "ip_frag_common.h"
43 * RTE IPv6 Fragmentation
45 * Implementation of IPv6 fragmentation.
49 /* Fragment Extension Header */
50 #define IPV6_HDR_MF_SHIFT 0
51 #define IPV6_HDR_FO_SHIFT 3
52 #define IPV6_HDR_MF_MASK (1 << IPV6_HDR_MF_SHIFT)
53 #define IPV6_HDR_FO_MASK ((1 << IPV6_HDR_FO_SHIFT) - 1)
56 __fill_ipv6hdr_frag(struct ipv6_hdr *dst,
57 const struct ipv6_hdr *src, uint16_t len, uint16_t fofs,
60 struct ipv6_extension_fragment *fh;
62 rte_memcpy(dst, src, sizeof(*dst));
63 dst->payload_len = rte_cpu_to_be_16(len);
64 dst->proto = IPPROTO_FRAGMENT;
66 fh = (struct ipv6_extension_fragment *) ++dst;
67 fh->next_header = src->proto;
69 fh->frag_offset = rte_cpu_to_be_16(fofs);
71 fh->more_frags = rte_cpu_to_be_16(mf);
76 __free_fragments(struct rte_mbuf *mb[], uint32_t num)
79 for (i = 0; i < num; i++)
80 rte_pktmbuf_free(mb[i]);
86 * This function implements the fragmentation of IPv6 packets.
91 * Array storing the output fragments.
93 * Size in bytes of the Maximum Transfer Unit (MTU) for the outgoing IPv6
94 * datagrams. This value includes the size of the IPv6 header.
96 * MBUF pool used for allocating direct buffers for the output fragments.
97 * @param pool_indirect
98 * MBUF pool used for allocating indirect buffers for the output fragments.
100 * Upon successful completion - number of output fragments placed
101 * in the pkts_out array.
102 * Otherwise - (-1) * <errno>.
105 rte_ipv6_fragment_packet(struct rte_mbuf *pkt_in,
106 struct rte_mbuf **pkts_out,
107 uint16_t nb_pkts_out,
109 struct rte_mempool *pool_direct,
110 struct rte_mempool *pool_indirect)
112 struct rte_mbuf *in_seg = NULL;
113 struct ipv6_hdr *in_hdr;
114 uint32_t out_pkt_pos, in_seg_data_pos;
115 uint32_t more_in_segs;
116 uint16_t fragment_offset, frag_size;
118 frag_size = (uint16_t)(mtu_size - sizeof(struct ipv6_hdr));
120 /* Fragment size should be a multiple of 8. */
121 IP_FRAG_ASSERT((frag_size & IPV6_HDR_FO_MASK) == 0);
123 /* Check that pkts_out is big enough to hold all fragments */
124 if (unlikely (frag_size * nb_pkts_out <
125 (uint16_t)(pkt_in->pkt_len - sizeof (struct ipv6_hdr))))
128 in_hdr = rte_pktmbuf_mtod(pkt_in, struct ipv6_hdr *);
131 in_seg_data_pos = sizeof(struct ipv6_hdr);
136 while (likely(more_in_segs)) {
137 struct rte_mbuf *out_pkt = NULL, *out_seg_prev = NULL;
138 uint32_t more_out_segs;
139 struct ipv6_hdr *out_hdr;
141 /* Allocate direct buffer */
142 out_pkt = rte_pktmbuf_alloc(pool_direct);
143 if (unlikely(out_pkt == NULL)) {
144 __free_fragments(pkts_out, out_pkt_pos);
148 /* Reserve space for the IP header that will be built later */
149 out_pkt->data_len = sizeof(struct ipv6_hdr) + sizeof(struct ipv6_extension_fragment);
150 out_pkt->pkt_len = sizeof(struct ipv6_hdr) + sizeof(struct ipv6_extension_fragment);
152 out_seg_prev = out_pkt;
154 while (likely(more_out_segs && more_in_segs)) {
155 struct rte_mbuf *out_seg = NULL;
158 /* Allocate indirect buffer */
159 out_seg = rte_pktmbuf_alloc(pool_indirect);
160 if (unlikely(out_seg == NULL)) {
161 rte_pktmbuf_free(out_pkt);
162 __free_fragments(pkts_out, out_pkt_pos);
165 out_seg_prev->next = out_seg;
166 out_seg_prev = out_seg;
168 /* Prepare indirect buffer */
169 rte_pktmbuf_attach(out_seg, in_seg);
170 len = mtu_size - out_pkt->pkt_len;
171 if (len > (in_seg->data_len - in_seg_data_pos)) {
172 len = in_seg->data_len - in_seg_data_pos;
174 out_seg->data_off = in_seg->data_off + in_seg_data_pos;
175 out_seg->data_len = (uint16_t)len;
176 out_pkt->pkt_len = (uint16_t)(len +
178 out_pkt->nb_segs += 1;
179 in_seg_data_pos += len;
181 /* Current output packet (i.e. fragment) done ? */
182 if (unlikely(out_pkt->pkt_len >= mtu_size)) {
186 /* Current input segment done ? */
187 if (unlikely(in_seg_data_pos == in_seg->data_len)) {
188 in_seg = in_seg->next;
191 if (unlikely(in_seg == NULL)) {
197 /* Build the IP header */
199 out_hdr = rte_pktmbuf_mtod(out_pkt, struct ipv6_hdr *);
201 __fill_ipv6hdr_frag(out_hdr, in_hdr,
202 (uint16_t) out_pkt->pkt_len - sizeof(struct ipv6_hdr),
203 fragment_offset, more_in_segs);
205 fragment_offset = (uint16_t)(fragment_offset +
206 out_pkt->pkt_len - sizeof(struct ipv6_hdr)
207 - sizeof(struct ipv6_extension_fragment));
209 /* Write the fragment to the output list */
210 pkts_out[out_pkt_pos] = out_pkt;
214 return (out_pkt_pos);