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34 #ifndef __INCLUDE_RTE_IPV4_FRAG_H__
35 #define __INCLUDE_RTE_IPV4_FRAG_H__
40 * RTE IPv4 Fragmentation
42 * Implementation of IPv4 fragmentation.
47 * Default byte size for the IPv4 Maximum Transfer Unit (MTU).
48 * This value includes the size of IPv4 header.
50 #define IPV4_MTU_DEFAULT ETHER_MTU
53 * Default payload in bytes for the IPv4 packet.
55 #define IPV4_DEFAULT_PAYLOAD (IPV4_MTU_DEFAULT - sizeof(struct ipv4_hdr))
58 * MAX number of fragments per packet allowed.
60 #define IPV4_MAX_FRAGS_PER_PACKET 0x80
64 #ifdef RTE_IPV4_FRAG_DEBUG
66 #define RTE_IPV4_FRAG_ASSERT(exp) \
68 rte_panic("function %s, line%d\tassert \"" #exp "\" failed\n", \
69 __func__, __LINE__); \
72 #else /*RTE_IPV4_FRAG_DEBUG*/
74 #define RTE_IPV4_FRAG_ASSERT(exp) do { } while(0)
76 #endif /*RTE_IPV4_FRAG_DEBUG*/
79 #define IPV4_HDR_DF_SHIFT 14
80 #define IPV4_HDR_MF_SHIFT 13
81 #define IPV4_HDR_FO_SHIFT 3
83 #define IPV4_HDR_DF_MASK (1 << IPV4_HDR_DF_SHIFT)
84 #define IPV4_HDR_MF_MASK (1 << IPV4_HDR_MF_SHIFT)
86 #define IPV4_HDR_FO_MASK ((1 << IPV4_HDR_FO_SHIFT) - 1)
88 static inline void __fill_ipv4hdr_frag(struct ipv4_hdr *dst,
89 const struct ipv4_hdr *src, uint16_t len, uint16_t fofs,
90 uint16_t dofs, uint32_t mf)
92 rte_memcpy(dst, src, sizeof(*dst));
93 fofs = (uint16_t)(fofs + (dofs >> IPV4_HDR_FO_SHIFT));
94 fofs = (uint16_t)(fofs | mf << IPV4_HDR_MF_SHIFT);
95 dst->fragment_offset = rte_cpu_to_be_16(fofs);
96 dst->total_length = rte_cpu_to_be_16(len);
97 dst->hdr_checksum = 0;
100 static inline void __free_fragments(struct rte_mbuf *mb[], uint32_t num)
103 for (i = 0; i != num; i++)
104 rte_pktmbuf_free(mb[i]);
108 * IPv4 fragmentation.
110 * This function implements the fragmentation of IPv4 packets.
115 * Array storing the output fragments.
117 * Size in bytes of the Maximum Transfer Unit (MTU) for the outgoing IPv4
118 * datagrams. This value includes the size of the IPv4 header.
120 * MBUF pool used for allocating direct buffers for the output fragments.
121 * @param pool_indirect
122 * MBUF pool used for allocating indirect buffers for the output fragments.
124 * Upon successful completion - number of output fragments placed
125 * in the pkts_out array.
126 * Otherwise - (-1) * <errno>.
128 static inline int32_t rte_ipv4_fragmentation(struct rte_mbuf *pkt_in,
129 struct rte_mbuf **pkts_out,
130 uint16_t nb_pkts_out,
132 struct rte_mempool *pool_direct,
133 struct rte_mempool *pool_indirect)
135 struct rte_mbuf *in_seg = NULL;
136 struct ipv4_hdr *in_hdr;
137 uint32_t out_pkt_pos, in_seg_data_pos;
138 uint32_t more_in_segs;
139 uint16_t fragment_offset, flag_offset, frag_size;
141 frag_size = (uint16_t)(mtu_size - sizeof(struct ipv4_hdr));
143 /* Fragment size should be a multiply of 8. */
144 RTE_IPV4_FRAG_ASSERT((frag_size & IPV4_HDR_FO_MASK) == 0);
146 /* Fragment size should be a multiply of 8. */
147 RTE_IPV4_FRAG_ASSERT(IPV4_MAX_FRAGS_PER_PACKET * frag_size >=
148 (uint16_t)(pkt_in->pkt.pkt_len - sizeof (struct ipv4_hdr)));
150 in_hdr = (struct ipv4_hdr*) pkt_in->pkt.data;
151 flag_offset = rte_cpu_to_be_16(in_hdr->fragment_offset);
153 /* If Don't Fragment flag is set */
154 if (unlikely ((flag_offset & IPV4_HDR_DF_MASK) != 0))
157 /* Check that pkts_out is big enough to hold all fragments */
158 if (unlikely (frag_size * nb_pkts_out <
159 (uint16_t)(pkt_in->pkt.pkt_len - sizeof (struct ipv4_hdr))))
163 in_seg_data_pos = sizeof(struct ipv4_hdr);
168 while (likely(more_in_segs)) {
169 struct rte_mbuf *out_pkt = NULL, *out_seg_prev = NULL;
170 uint32_t more_out_segs;
171 struct ipv4_hdr *out_hdr;
173 /* Allocate direct buffer */
174 out_pkt = rte_pktmbuf_alloc(pool_direct);
175 if (unlikely(out_pkt == NULL)) {
176 __free_fragments(pkts_out, out_pkt_pos);
180 /* Reserve space for the IP header that will be built later */
181 out_pkt->pkt.data_len = sizeof(struct ipv4_hdr);
182 out_pkt->pkt.pkt_len = sizeof(struct ipv4_hdr);
184 out_seg_prev = out_pkt;
186 while (likely(more_out_segs && more_in_segs)) {
187 struct rte_mbuf *out_seg = NULL;
190 /* Allocate indirect buffer */
191 out_seg = rte_pktmbuf_alloc(pool_indirect);
192 if (unlikely(out_seg == NULL)) {
193 rte_pktmbuf_free(out_pkt);
194 __free_fragments(pkts_out, out_pkt_pos);
197 out_seg_prev->pkt.next = out_seg;
198 out_seg_prev = out_seg;
200 /* Prepare indirect buffer */
201 rte_pktmbuf_attach(out_seg, in_seg);
202 len = mtu_size - out_pkt->pkt.pkt_len;
203 if (len > (in_seg->pkt.data_len - in_seg_data_pos)) {
204 len = in_seg->pkt.data_len - in_seg_data_pos;
206 out_seg->pkt.data = (char*) in_seg->pkt.data + (uint16_t)in_seg_data_pos;
207 out_seg->pkt.data_len = (uint16_t)len;
208 out_pkt->pkt.pkt_len = (uint16_t)(len +
209 out_pkt->pkt.pkt_len);
210 out_pkt->pkt.nb_segs += 1;
211 in_seg_data_pos += len;
213 /* Current output packet (i.e. fragment) done ? */
214 if (unlikely(out_pkt->pkt.pkt_len >= mtu_size)) {
218 /* Current input segment done ? */
219 if (unlikely(in_seg_data_pos == in_seg->pkt.data_len)) {
220 in_seg = in_seg->pkt.next;
223 if (unlikely(in_seg == NULL)) {
229 /* Build the IP header */
231 out_hdr = (struct ipv4_hdr*) out_pkt->pkt.data;
233 __fill_ipv4hdr_frag(out_hdr, in_hdr,
234 (uint16_t)out_pkt->pkt.pkt_len,
235 flag_offset, fragment_offset, more_in_segs);
237 fragment_offset = (uint16_t)(fragment_offset +
238 out_pkt->pkt.pkt_len - sizeof(struct ipv4_hdr));
240 out_pkt->ol_flags |= PKT_TX_IP_CKSUM;
241 out_pkt->pkt.vlan_macip.f.l3_len = sizeof(struct ipv4_hdr);
243 /* Write the fragment to the output list */
244 pkts_out[out_pkt_pos] = out_pkt;
248 return (out_pkt_pos);