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38 #include <rte_byteorder.h>
39 #include <rte_memcpy.h>
40 #include <rte_mempool.h>
41 #include <rte_debug.h>
45 #include "rte_ip_frag.h"
46 #include "ip_frag_common.h"
49 * MAX number of fragments per packet allowed.
51 #define IPV4_MAX_FRAGS_PER_PACKET 0x80
54 #define IPV4_HDR_DF_SHIFT 14
55 #define IPV4_HDR_MF_SHIFT 13
56 #define IPV4_HDR_FO_SHIFT 3
58 #define IPV4_HDR_DF_MASK (1 << IPV4_HDR_DF_SHIFT)
59 #define IPV4_HDR_MF_MASK (1 << IPV4_HDR_MF_SHIFT)
61 #define IPV4_HDR_FO_MASK ((1 << IPV4_HDR_FO_SHIFT) - 1)
63 static inline void __fill_ipv4hdr_frag(struct ipv4_hdr *dst,
64 const struct ipv4_hdr *src, uint16_t len, uint16_t fofs,
65 uint16_t dofs, uint32_t mf)
67 rte_memcpy(dst, src, sizeof(*dst));
68 fofs = (uint16_t)(fofs + (dofs >> IPV4_HDR_FO_SHIFT));
69 fofs = (uint16_t)(fofs | mf << IPV4_HDR_MF_SHIFT);
70 dst->fragment_offset = rte_cpu_to_be_16(fofs);
71 dst->total_length = rte_cpu_to_be_16(len);
72 dst->hdr_checksum = 0;
75 static inline void __free_fragments(struct rte_mbuf *mb[], uint32_t num)
78 for (i = 0; i != num; i++)
79 rte_pktmbuf_free(mb[i]);
85 * This function implements the fragmentation of IPv4 packets.
90 * Array storing the output fragments.
92 * Size in bytes of the Maximum Transfer Unit (MTU) for the outgoing IPv4
93 * datagrams. This value includes the size of the IPv4 header.
95 * MBUF pool used for allocating direct buffers for the output fragments.
96 * @param pool_indirect
97 * MBUF pool used for allocating indirect buffers for the output fragments.
99 * Upon successful completion - number of output fragments placed
100 * in the pkts_out array.
101 * Otherwise - (-1) * <errno>.
104 rte_ipv4_fragmentation(struct rte_mbuf *pkt_in,
105 struct rte_mbuf **pkts_out,
106 uint16_t nb_pkts_out,
108 struct rte_mempool *pool_direct,
109 struct rte_mempool *pool_indirect)
111 struct rte_mbuf *in_seg = NULL;
112 struct ipv4_hdr *in_hdr;
113 uint32_t out_pkt_pos, in_seg_data_pos;
114 uint32_t more_in_segs;
115 uint16_t fragment_offset, flag_offset, frag_size;
117 frag_size = (uint16_t)(mtu_size - sizeof(struct ipv4_hdr));
119 /* Fragment size should be a multiply of 8. */
120 RTE_IP_FRAG_ASSERT((frag_size & IPV4_HDR_FO_MASK) == 0);
122 /* Fragment size should be a multiply of 8. */
123 RTE_IP_FRAG_ASSERT(IPV4_MAX_FRAGS_PER_PACKET * frag_size >=
124 (uint16_t)(pkt_in->pkt.pkt_len - sizeof(struct ipv4_hdr)));
126 in_hdr = (struct ipv4_hdr *) pkt_in->pkt.data;
127 flag_offset = rte_cpu_to_be_16(in_hdr->fragment_offset);
129 /* If Don't Fragment flag is set */
130 if (unlikely ((flag_offset & IPV4_HDR_DF_MASK) != 0))
133 /* Check that pkts_out is big enough to hold all fragments */
134 if (unlikely(frag_size * nb_pkts_out <
135 (uint16_t)(pkt_in->pkt.pkt_len - sizeof (struct ipv4_hdr))))
139 in_seg_data_pos = sizeof(struct ipv4_hdr);
144 while (likely(more_in_segs)) {
145 struct rte_mbuf *out_pkt = NULL, *out_seg_prev = NULL;
146 uint32_t more_out_segs;
147 struct ipv4_hdr *out_hdr;
149 /* Allocate direct buffer */
150 out_pkt = rte_pktmbuf_alloc(pool_direct);
151 if (unlikely(out_pkt == NULL)) {
152 __free_fragments(pkts_out, out_pkt_pos);
156 /* Reserve space for the IP header that will be built later */
157 out_pkt->pkt.data_len = sizeof(struct ipv4_hdr);
158 out_pkt->pkt.pkt_len = sizeof(struct ipv4_hdr);
160 out_seg_prev = out_pkt;
162 while (likely(more_out_segs && more_in_segs)) {
163 struct rte_mbuf *out_seg = NULL;
166 /* Allocate indirect buffer */
167 out_seg = rte_pktmbuf_alloc(pool_indirect);
168 if (unlikely(out_seg == NULL)) {
169 rte_pktmbuf_free(out_pkt);
170 __free_fragments(pkts_out, out_pkt_pos);
173 out_seg_prev->pkt.next = out_seg;
174 out_seg_prev = out_seg;
176 /* Prepare indirect buffer */
177 rte_pktmbuf_attach(out_seg, in_seg);
178 len = mtu_size - out_pkt->pkt.pkt_len;
179 if (len > (in_seg->pkt.data_len - in_seg_data_pos)) {
180 len = in_seg->pkt.data_len - in_seg_data_pos;
182 out_seg->pkt.data = (char*) in_seg->pkt.data + (uint16_t)in_seg_data_pos;
183 out_seg->pkt.data_len = (uint16_t)len;
184 out_pkt->pkt.pkt_len = (uint16_t)(len +
185 out_pkt->pkt.pkt_len);
186 out_pkt->pkt.nb_segs += 1;
187 in_seg_data_pos += len;
189 /* Current output packet (i.e. fragment) done ? */
190 if (unlikely(out_pkt->pkt.pkt_len >= mtu_size))
193 /* Current input segment done ? */
194 if (unlikely(in_seg_data_pos == in_seg->pkt.data_len)) {
195 in_seg = in_seg->pkt.next;
198 if (unlikely(in_seg == NULL))
203 /* Build the IP header */
205 out_hdr = (struct ipv4_hdr*) out_pkt->pkt.data;
207 __fill_ipv4hdr_frag(out_hdr, in_hdr,
208 (uint16_t)out_pkt->pkt.pkt_len,
209 flag_offset, fragment_offset, more_in_segs);
211 fragment_offset = (uint16_t)(fragment_offset +
212 out_pkt->pkt.pkt_len - sizeof(struct ipv4_hdr));
214 out_pkt->ol_flags |= PKT_TX_IP_CKSUM;
215 out_pkt->pkt.vlan_macip.f.l3_len = sizeof(struct ipv4_hdr);
217 /* Write the fragment to the output list */
218 pkts_out[out_pkt_pos] = out_pkt;