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37 #include <rte_malloc.h>
38 #include <rte_memcpy.h>
39 #include <rte_byteorder.h>
43 #include "rte_ip_frag.h"
44 #include "ip_frag_common.h"
50 * Implementation of IPv6 reassembly.
55 * Reassemble fragments into one packet.
58 ipv6_frag_reassemble(const struct rte_ip_frag_pkt *fp)
60 struct ipv6_hdr *ip_hdr;
61 struct ipv6_extension_fragment *frag_hdr;
62 struct rte_mbuf *m, *prev;
63 uint32_t i, n, ofs, first_len;
64 uint32_t last_len, move_len, payload_len;
66 first_len = fp->frags[IP_FIRST_FRAG_IDX].len;
69 /*start from the last fragment. */
70 m = fp->frags[IP_LAST_FRAG_IDX].mb;
71 ofs = fp->frags[IP_LAST_FRAG_IDX].ofs;
72 last_len = fp->frags[IP_LAST_FRAG_IDX].len;
74 payload_len = ofs + last_len;
76 while (ofs != first_len) {
80 for (i = n; i != IP_FIRST_FRAG_IDX && ofs != first_len; i--) {
82 /* previous fragment found. */
83 if (fp->frags[i].ofs + fp->frags[i].len == ofs) {
85 ip_frag_chain(fp->frags[i].mb, m);
87 /* update our last fragment and offset. */
89 ofs = fp->frags[i].ofs;
93 /* error - hole in the packet. */
99 /* chain with the first fragment. */
100 ip_frag_chain(fp->frags[IP_FIRST_FRAG_IDX].mb, m);
101 m = fp->frags[IP_FIRST_FRAG_IDX].mb;
103 /* update mbuf fields for reassembled packet. */
104 m->ol_flags |= PKT_TX_IP_CKSUM;
106 /* update ipv6 header for the reassembled datagram */
107 ip_hdr = (struct ipv6_hdr *) (rte_pktmbuf_mtod(m, uint8_t *) +
108 m->pkt.vlan_macip.f.l2_len);
110 ip_hdr->payload_len = rte_cpu_to_be_16(payload_len);
113 * remove fragmentation header. note that per RFC2460, we need to update
114 * the last non-fragmentable header with the "next header" field to contain
115 * type of the first fragmentable header, but we currently don't support
116 * other headers, so we assume there are no other headers and thus update
117 * the main IPv6 header instead.
119 move_len = m->pkt.vlan_macip.f.l2_len + m->pkt.vlan_macip.f.l3_len -
121 frag_hdr = (struct ipv6_extension_fragment *) (ip_hdr + 1);
122 ip_hdr->proto = frag_hdr->next_header;
124 memmove(rte_pktmbuf_mtod(m, char*) + sizeof(*frag_hdr),
125 rte_pktmbuf_mtod(m, char*), move_len);
127 rte_pktmbuf_adj(m, sizeof(*frag_hdr));
133 * Process new mbuf with fragment of IPV6 datagram.
134 * Incoming mbuf should have its l2_len/l3_len fields setup correctly.
136 * Table where to lookup/add the fragmented packet.
138 * Incoming mbuf with IPV6 fragment.
140 * Fragment arrival timestamp.
142 * Pointer to the IPV6 header.
144 * Pointer to the IPV6 fragment extension header.
146 * Pointer to mbuf for reassembled packet, or NULL if:
147 * - an error occured.
148 * - not all fragments of the packet are collected yet.
150 #define MORE_FRAGS(x) (((x) & 0x100) >> 8)
151 #define FRAG_OFFSET(x) (rte_cpu_to_be_16(x) >> 3)
153 rte_ipv6_frag_reassemble_packet(struct rte_ip_frag_tbl *tbl,
154 struct rte_ip_frag_death_row *dr, struct rte_mbuf *mb, uint64_t tms,
155 struct ipv6_hdr *ip_hdr, struct ipv6_extension_fragment *frag_hdr)
157 struct rte_ip_frag_pkt *fp;
158 struct ip_frag_key key;
159 uint16_t ip_len, ip_ofs;
161 rte_memcpy(&key.src_dst[0], ip_hdr->src_addr, 16);
162 rte_memcpy(&key.src_dst[2], ip_hdr->dst_addr, 16);
164 key.id = frag_hdr->id;
165 key.key_len = IPV6_KEYLEN;
167 ip_ofs = FRAG_OFFSET(frag_hdr->frag_data) * 8;
170 * as per RFC2460, payload length contains all extension headers as well.
171 * since we don't support anything but frag headers, this is what we remove
172 * from the payload len.
174 ip_len = rte_be_to_cpu_16(ip_hdr->payload_len) - sizeof(*frag_hdr);
176 IP_FRAG_LOG(DEBUG, "%s:%d:\n"
177 "mbuf: %p, tms: %" PRIu64
178 ", key: <" IPv6_KEY_BYTES_FMT ", %#x>, ofs: %u, len: %u, flags: %#x\n"
179 "tbl: %p, max_cycles: %" PRIu64 ", entry_mask: %#x, "
180 "max_entries: %u, use_entries: %u\n\n",
182 mb, tms, IPv6_KEY_BYTES(key.src_dst), key.id, ip_ofs, ip_len, frag_hdr->more_frags,
183 tbl, tbl->max_cycles, tbl->entry_mask, tbl->max_entries,
186 /* try to find/add entry into the fragment's table. */
187 fp = ip_frag_find(tbl, dr, &key, tms);
189 IP_FRAG_MBUF2DR(dr, mb);
193 IP_FRAG_LOG(DEBUG, "%s:%d:\n"
194 "tbl: %p, max_entries: %u, use_entries: %u\n"
195 "ipv6_frag_pkt: %p, key: <" IPv6_KEY_BYTES_FMT ", %#x>, start: %" PRIu64
196 ", total_size: %u, frag_size: %u, last_idx: %u\n\n",
198 tbl, tbl->max_entries, tbl->use_entries,
199 fp, IPv6_KEY_BYTES(fp->key.src_dst), fp->key.id, fp->start,
200 fp->total_size, fp->frag_size, fp->last_idx);
203 /* process the fragmented packet. */
204 mb = ip_frag_process(fp, dr, mb, ip_ofs, ip_len,
205 MORE_FRAGS(frag_hdr->frag_data));
206 ip_frag_inuse(tbl, fp);
208 IP_FRAG_LOG(DEBUG, "%s:%d:\n"
210 "tbl: %p, max_entries: %u, use_entries: %u\n"
211 "ipv6_frag_pkt: %p, key: <" IPv6_KEY_BYTES_FMT ", %#x>, start: %" PRIu64
212 ", total_size: %u, frag_size: %u, last_idx: %u\n\n",
213 __func__, __LINE__, mb,
214 tbl, tbl->max_entries, tbl->use_entries,
215 fp, IPv6_KEY_BYTES(fp->key.src_dst), fp->key.id, fp->start,
216 fp->total_size, fp->frag_size, fp->last_idx);