]>
git.proxmox.com Git - ceph.git/blob - ceph/src/seastar/dpdk/lib/librte_ip_frag/rte_ipv4_reassembly.c
1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
9 #include "ip_frag_common.h"
12 * Reassemble fragments into one packet.
15 ipv4_frag_reassemble(struct ip_frag_pkt
*fp
)
17 struct ipv4_hdr
*ip_hdr
;
18 struct rte_mbuf
*m
, *prev
;
19 uint32_t i
, n
, ofs
, first_len
;
20 uint32_t curr_idx
= 0;
22 first_len
= fp
->frags
[IP_FIRST_FRAG_IDX
].len
;
25 /*start from the last fragment. */
26 m
= fp
->frags
[IP_LAST_FRAG_IDX
].mb
;
27 ofs
= fp
->frags
[IP_LAST_FRAG_IDX
].ofs
;
28 curr_idx
= IP_LAST_FRAG_IDX
;
30 while (ofs
!= first_len
) {
34 for (i
= n
; i
!= IP_FIRST_FRAG_IDX
&& ofs
!= first_len
; i
--) {
36 /* previous fragment found. */
37 if(fp
->frags
[i
].ofs
+ fp
->frags
[i
].len
== ofs
) {
39 RTE_ASSERT(curr_idx
!= i
);
41 /* adjust start of the last fragment data. */
43 (uint16_t)(m
->l2_len
+ m
->l3_len
));
44 rte_pktmbuf_chain(fp
->frags
[i
].mb
, m
);
46 /* this mbuf should not be accessed directly */
47 fp
->frags
[curr_idx
].mb
= NULL
;
50 /* update our last fragment and offset. */
52 ofs
= fp
->frags
[i
].ofs
;
56 /* error - hole in the packet. */
62 /* chain with the first fragment. */
63 rte_pktmbuf_adj(m
, (uint16_t)(m
->l2_len
+ m
->l3_len
));
64 rte_pktmbuf_chain(fp
->frags
[IP_FIRST_FRAG_IDX
].mb
, m
);
65 fp
->frags
[curr_idx
].mb
= NULL
;
66 m
= fp
->frags
[IP_FIRST_FRAG_IDX
].mb
;
67 fp
->frags
[IP_FIRST_FRAG_IDX
].mb
= NULL
;
69 /* update mbuf fields for reassembled packet. */
70 m
->ol_flags
|= PKT_TX_IP_CKSUM
;
72 /* update ipv4 header for the reassembled packet */
73 ip_hdr
= rte_pktmbuf_mtod_offset(m
, struct ipv4_hdr
*, m
->l2_len
);
75 ip_hdr
->total_length
= rte_cpu_to_be_16((uint16_t)(fp
->total_size
+
77 ip_hdr
->fragment_offset
= (uint16_t)(ip_hdr
->fragment_offset
&
78 rte_cpu_to_be_16(IPV4_HDR_DF_FLAG
));
79 ip_hdr
->hdr_checksum
= 0;
85 * Process new mbuf with fragment of IPV4 packet.
86 * Incoming mbuf should have it's l2_len/l3_len fields setuped correclty.
88 * Table where to lookup/add the fragmented packet.
90 * Incoming mbuf with IPV4 fragment.
92 * Fragment arrival timestamp.
94 * Pointer to the IPV4 header inside the fragment.
96 * Pointer to mbuf for reassembled packet, or NULL if:
97 * - an error occurred.
98 * - not all fragments of the packet are collected yet.
101 rte_ipv4_frag_reassemble_packet(struct rte_ip_frag_tbl
*tbl
,
102 struct rte_ip_frag_death_row
*dr
, struct rte_mbuf
*mb
, uint64_t tms
,
103 struct ipv4_hdr
*ip_hdr
)
105 struct ip_frag_pkt
*fp
;
106 struct ip_frag_key key
;
107 const unaligned_uint64_t
*psd
;
108 uint16_t flag_offset
, ip_ofs
, ip_flag
;
111 flag_offset
= rte_be_to_cpu_16(ip_hdr
->fragment_offset
);
112 ip_ofs
= (uint16_t)(flag_offset
& IPV4_HDR_OFFSET_MASK
);
113 ip_flag
= (uint16_t)(flag_offset
& IPV4_HDR_MF_FLAG
);
115 psd
= (unaligned_uint64_t
*)&ip_hdr
->src_addr
;
116 /* use first 8 bytes only */
117 key
.src_dst
[0] = psd
[0];
118 key
.id
= ip_hdr
->packet_id
;
119 key
.key_len
= IPV4_KEYLEN
;
121 ip_ofs
*= IPV4_HDR_OFFSET_UNITS
;
122 ip_len
= rte_be_to_cpu_16(ip_hdr
->total_length
) - mb
->l3_len
;
124 IP_FRAG_LOG(DEBUG
, "%s:%d:\n"
125 "mbuf: %p, tms: %" PRIu64
126 ", key: <%" PRIx64
", %#x>, ofs: %u, len: %d, flags: %#x\n"
127 "tbl: %p, max_cycles: %" PRIu64
", entry_mask: %#x, "
128 "max_entries: %u, use_entries: %u\n\n",
130 mb
, tms
, key
.src_dst
[0], key
.id
, ip_ofs
, ip_len
, ip_flag
,
131 tbl
, tbl
->max_cycles
, tbl
->entry_mask
, tbl
->max_entries
,
134 /* check that fragment length is greater then zero. */
136 IP_FRAG_MBUF2DR(dr
, mb
);
140 /* try to find/add entry into the fragment's table. */
141 if ((fp
= ip_frag_find(tbl
, dr
, &key
, tms
)) == NULL
) {
142 IP_FRAG_MBUF2DR(dr
, mb
);
146 IP_FRAG_LOG(DEBUG
, "%s:%d:\n"
147 "tbl: %p, max_entries: %u, use_entries: %u\n"
148 "ipv4_frag_pkt: %p, key: <%" PRIx64
", %#x>, start: %" PRIu64
149 ", total_size: %u, frag_size: %u, last_idx: %u\n\n",
151 tbl
, tbl
->max_entries
, tbl
->use_entries
,
152 fp
, fp
->key
.src_dst
[0], fp
->key
.id
, fp
->start
,
153 fp
->total_size
, fp
->frag_size
, fp
->last_idx
);
156 /* process the fragmented packet. */
157 mb
= ip_frag_process(fp
, dr
, mb
, ip_ofs
, ip_len
, ip_flag
);
158 ip_frag_inuse(tbl
, fp
);
160 IP_FRAG_LOG(DEBUG
, "%s:%d:\n"
162 "tbl: %p, max_entries: %u, use_entries: %u\n"
163 "ipv4_frag_pkt: %p, key: <%" PRIx64
", %#x>, start: %" PRIu64
164 ", total_size: %u, frag_size: %u, last_idx: %u\n\n",
165 __func__
, __LINE__
, mb
,
166 tbl
, tbl
->max_entries
, tbl
->use_entries
,
167 fp
, fp
->key
.src_dst
[0], fp
->key
.id
, fp
->start
,
168 fp
->total_size
, fp
->frag_size
, fp
->last_idx
);