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37 #include <rte_memcpy.h>
39 #include "ip_frag_common.h"
43 * RTE IPv6 Fragmentation
45 * Implementation of IPv6 fragmentation.
50 __fill_ipv6hdr_frag(struct ipv6_hdr *dst,
51 const struct ipv6_hdr *src, uint16_t len, uint16_t fofs,
54 struct ipv6_extension_fragment *fh;
56 rte_memcpy(dst, src, sizeof(*dst));
57 dst->payload_len = rte_cpu_to_be_16(len);
58 dst->proto = IPPROTO_FRAGMENT;
60 fh = (struct ipv6_extension_fragment *) ++dst;
61 fh->next_header = src->proto;
63 fh->frag_data = rte_cpu_to_be_16(RTE_IPV6_SET_FRAG_DATA(fofs, mf));
68 __free_fragments(struct rte_mbuf *mb[], uint32_t num)
71 for (i = 0; i < num; i++)
72 rte_pktmbuf_free(mb[i]);
78 * This function implements the fragmentation of IPv6 packets.
83 * Array storing the output fragments.
85 * Size in bytes of the Maximum Transfer Unit (MTU) for the outgoing IPv6
86 * datagrams. This value includes the size of the IPv6 header.
88 * MBUF pool used for allocating direct buffers for the output fragments.
89 * @param pool_indirect
90 * MBUF pool used for allocating indirect buffers for the output fragments.
92 * Upon successful completion - number of output fragments placed
93 * in the pkts_out array.
94 * Otherwise - (-1) * <errno>.
97 rte_ipv6_fragment_packet(struct rte_mbuf *pkt_in,
98 struct rte_mbuf **pkts_out,
101 struct rte_mempool *pool_direct,
102 struct rte_mempool *pool_indirect)
104 struct rte_mbuf *in_seg = NULL;
105 struct ipv6_hdr *in_hdr;
106 uint32_t out_pkt_pos, in_seg_data_pos;
107 uint32_t more_in_segs;
108 uint16_t fragment_offset, frag_size;
110 frag_size = (uint16_t)(mtu_size - sizeof(struct ipv6_hdr));
112 /* Fragment size should be a multiple of 8. */
113 RTE_ASSERT((frag_size & ~RTE_IPV6_EHDR_FO_MASK) == 0);
115 /* Check that pkts_out is big enough to hold all fragments */
116 if (unlikely (frag_size * nb_pkts_out <
117 (uint16_t)(pkt_in->pkt_len - sizeof (struct ipv6_hdr))))
120 in_hdr = rte_pktmbuf_mtod(pkt_in, struct ipv6_hdr *);
123 in_seg_data_pos = sizeof(struct ipv6_hdr);
128 while (likely(more_in_segs)) {
129 struct rte_mbuf *out_pkt = NULL, *out_seg_prev = NULL;
130 uint32_t more_out_segs;
131 struct ipv6_hdr *out_hdr;
133 /* Allocate direct buffer */
134 out_pkt = rte_pktmbuf_alloc(pool_direct);
135 if (unlikely(out_pkt == NULL)) {
136 __free_fragments(pkts_out, out_pkt_pos);
140 /* Reserve space for the IP header that will be built later */
141 out_pkt->data_len = sizeof(struct ipv6_hdr) + sizeof(struct ipv6_extension_fragment);
142 out_pkt->pkt_len = sizeof(struct ipv6_hdr) + sizeof(struct ipv6_extension_fragment);
144 out_seg_prev = out_pkt;
146 while (likely(more_out_segs && more_in_segs)) {
147 struct rte_mbuf *out_seg = NULL;
150 /* Allocate indirect buffer */
151 out_seg = rte_pktmbuf_alloc(pool_indirect);
152 if (unlikely(out_seg == NULL)) {
153 rte_pktmbuf_free(out_pkt);
154 __free_fragments(pkts_out, out_pkt_pos);
157 out_seg_prev->next = out_seg;
158 out_seg_prev = out_seg;
160 /* Prepare indirect buffer */
161 rte_pktmbuf_attach(out_seg, in_seg);
162 len = mtu_size - out_pkt->pkt_len;
163 if (len > (in_seg->data_len - in_seg_data_pos)) {
164 len = in_seg->data_len - in_seg_data_pos;
166 out_seg->data_off = in_seg->data_off + in_seg_data_pos;
167 out_seg->data_len = (uint16_t)len;
168 out_pkt->pkt_len = (uint16_t)(len +
170 out_pkt->nb_segs += 1;
171 in_seg_data_pos += len;
173 /* Current output packet (i.e. fragment) done ? */
174 if (unlikely(out_pkt->pkt_len >= mtu_size)) {
178 /* Current input segment done ? */
179 if (unlikely(in_seg_data_pos == in_seg->data_len)) {
180 in_seg = in_seg->next;
183 if (unlikely(in_seg == NULL)) {
189 /* Build the IP header */
191 out_hdr = rte_pktmbuf_mtod(out_pkt, struct ipv6_hdr *);
193 __fill_ipv6hdr_frag(out_hdr, in_hdr,
194 (uint16_t) out_pkt->pkt_len - sizeof(struct ipv6_hdr),
195 fragment_offset, more_in_segs);
197 fragment_offset = (uint16_t)(fragment_offset +
198 out_pkt->pkt_len - sizeof(struct ipv6_hdr)
199 - sizeof(struct ipv6_extension_fragment));
201 /* Write the fragment to the output list */
202 pkts_out[out_pkt_pos] = out_pkt;