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38 #include <rte_byteorder.h>
39 #include <rte_memcpy.h>
42 #include "rte_ip_frag.h"
43 #include "ip_frag_common.h"
47 * RTE IPv6 Fragmentation
49 * Implementation of IPv6 fragmentation.
53 /* Fragment Extension Header */
54 #define IPV6_HDR_MF_SHIFT 0
55 #define IPV6_HDR_FO_SHIFT 3
56 #define IPV6_HDR_MF_MASK (1 << IPV6_HDR_MF_SHIFT)
57 #define IPV6_HDR_FO_MASK ((1 << IPV6_HDR_FO_SHIFT) - 1)
60 __fill_ipv6hdr_frag(struct ipv6_hdr *dst,
61 const struct ipv6_hdr *src, uint16_t len, uint16_t fofs,
64 struct ipv6_extension_fragment *fh;
66 rte_memcpy(dst, src, sizeof(*dst));
67 dst->payload_len = rte_cpu_to_be_16(len);
68 dst->proto = IPPROTO_FRAGMENT;
70 fh = (struct ipv6_extension_fragment *) ++dst;
71 fh->next_header = src->proto;
73 fh->frag_offset = rte_cpu_to_be_16(fofs);
75 fh->more_frags = rte_cpu_to_be_16(mf);
80 __free_fragments(struct rte_mbuf *mb[], uint32_t num)
83 for (i = 0; i < num; i++)
84 rte_pktmbuf_free(mb[i]);
90 * This function implements the fragmentation of IPv6 packets.
95 * Array storing the output fragments.
97 * Size in bytes of the Maximum Transfer Unit (MTU) for the outgoing IPv6
98 * datagrams. This value includes the size of the IPv6 header.
100 * MBUF pool used for allocating direct buffers for the output fragments.
101 * @param pool_indirect
102 * MBUF pool used for allocating indirect buffers for the output fragments.
104 * Upon successful completion - number of output fragments placed
105 * in the pkts_out array.
106 * Otherwise - (-1) * <errno>.
109 rte_ipv6_fragment_packet(struct rte_mbuf *pkt_in,
110 struct rte_mbuf **pkts_out,
111 uint16_t nb_pkts_out,
113 struct rte_mempool *pool_direct,
114 struct rte_mempool *pool_indirect)
116 struct rte_mbuf *in_seg = NULL;
117 struct ipv6_hdr *in_hdr;
118 uint32_t out_pkt_pos, in_seg_data_pos;
119 uint32_t more_in_segs;
120 uint16_t fragment_offset, frag_size;
122 frag_size = (uint16_t)(mtu_size - sizeof(struct ipv6_hdr));
124 /* Fragment size should be a multiple of 8. */
125 RTE_IP_FRAG_ASSERT((frag_size & IPV6_HDR_FO_MASK) == 0);
127 /* Check that pkts_out is big enough to hold all fragments */
128 if (unlikely (frag_size * nb_pkts_out <
129 (uint16_t)(pkt_in->pkt.pkt_len - sizeof (struct ipv6_hdr))))
132 in_hdr = (struct ipv6_hdr *) pkt_in->pkt.data;
135 in_seg_data_pos = sizeof(struct ipv6_hdr);
140 while (likely(more_in_segs)) {
141 struct rte_mbuf *out_pkt = NULL, *out_seg_prev = NULL;
142 uint32_t more_out_segs;
143 struct ipv6_hdr *out_hdr;
145 /* Allocate direct buffer */
146 out_pkt = rte_pktmbuf_alloc(pool_direct);
147 if (unlikely(out_pkt == NULL)) {
148 __free_fragments(pkts_out, out_pkt_pos);
152 /* Reserve space for the IP header that will be built later */
153 out_pkt->pkt.data_len = sizeof(struct ipv6_hdr) + sizeof(struct ipv6_extension_fragment);
154 out_pkt->pkt.pkt_len = sizeof(struct ipv6_hdr) + sizeof(struct ipv6_extension_fragment);
156 out_seg_prev = out_pkt;
158 while (likely(more_out_segs && more_in_segs)) {
159 struct rte_mbuf *out_seg = NULL;
162 /* Allocate indirect buffer */
163 out_seg = rte_pktmbuf_alloc(pool_indirect);
164 if (unlikely(out_seg == NULL)) {
165 rte_pktmbuf_free(out_pkt);
166 __free_fragments(pkts_out, out_pkt_pos);
169 out_seg_prev->pkt.next = out_seg;
170 out_seg_prev = out_seg;
172 /* Prepare indirect buffer */
173 rte_pktmbuf_attach(out_seg, in_seg);
174 len = mtu_size - out_pkt->pkt.pkt_len;
175 if (len > (in_seg->pkt.data_len - in_seg_data_pos)) {
176 len = in_seg->pkt.data_len - in_seg_data_pos;
178 out_seg->pkt.data = (char *) in_seg->pkt.data + (uint16_t) in_seg_data_pos;
179 out_seg->pkt.data_len = (uint16_t)len;
180 out_pkt->pkt.pkt_len = (uint16_t)(len +
181 out_pkt->pkt.pkt_len);
182 out_pkt->pkt.nb_segs += 1;
183 in_seg_data_pos += len;
185 /* Current output packet (i.e. fragment) done ? */
186 if (unlikely(out_pkt->pkt.pkt_len >= mtu_size)) {
190 /* Current input segment done ? */
191 if (unlikely(in_seg_data_pos == in_seg->pkt.data_len)) {
192 in_seg = in_seg->pkt.next;
195 if (unlikely(in_seg == NULL)) {
201 /* Build the IP header */
203 out_hdr = (struct ipv6_hdr *) out_pkt->pkt.data;
205 __fill_ipv6hdr_frag(out_hdr, in_hdr,
206 (uint16_t) out_pkt->pkt.pkt_len - sizeof(struct ipv6_hdr),
207 fragment_offset, more_in_segs);
209 fragment_offset = (uint16_t)(fragment_offset +
210 out_pkt->pkt.pkt_len - sizeof(struct ipv6_hdr)
211 - sizeof(struct ipv6_extension_fragment));
213 /* Write the fragment to the output list */
214 pkts_out[out_pkt_pos] = out_pkt;
218 return (out_pkt_pos);