1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2016 Intel Corporation
*/
#ifndef __IPIP_H__
#define __IPIP_H__
#include <stdint.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <rte_mbuf.h>
static inline void *
ipip_outbound(struct rte_mbuf *m, uint32_t offset, uint32_t is_ipv6,
struct ip_addr *src, struct ip_addr *dst)
{
struct ip *inip4, *outip4;
struct ip6_hdr *inip6, *outip6;
uint8_t ds_ecn;
inip4 = rte_pktmbuf_mtod(m, struct ip *);
RTE_ASSERT(inip4->ip_v == IPVERSION || inip4->ip_v == IP6_VERSION);
if (inip4->ip_v == IPVERSION) {
/* XXX This should be done by the forwarding engine instead */
inip4->ip_ttl -= 1;
if (inip4->ip_sum >= rte_cpu_to_be_16(0xffff - 0x100))
inip4->ip_sum += rte_cpu_to_be_16(0x100) + 1;
else
inip4->ip_sum += rte_cpu_to_be_16(0x100);
ds_ecn = inip4->ip_tos;
} else {
inip6 = (struct ip6_hdr *)inip4;
/* XXX This should be done by the forwarding engine instead */
inip6->ip6_hops -= 1;
ds_ecn = ntohl(inip6->ip6_flow) >> 20;
}
if (is_ipv6) {
offset += sizeof(struct ip6_hdr);
outip6 = (struct ip6_hdr *)rte_pktmbuf_prepend(m, offset);
RTE_ASSERT(outip6 != NULL);
/* Per RFC4301 5.1.2.1 */
outip6->ip6_flow = htonl(IP6_VERSION << 28 | ds_ecn << 20);
outip6->ip6_plen = htons(rte_pktmbuf_data_len(m) -
sizeof(struct ip6_hdr));
outip6->ip6_nxt = IPPROTO_ESP;
outip6->ip6_hops = IPDEFTTL;
memcpy(&outip6->ip6_src.s6_addr, src, 16);
memcpy(&outip6->ip6_dst.s6_addr, dst, 16);
return outip6;
}
offset += sizeof(struct ip);
outip4 = (struct ip *)rte_pktmbuf_prepend(m, offset);
RTE_ASSERT(outip4 != NULL);
/* Per RFC4301 5.1.2.1 */
outip4->ip_v = IPVERSION;
outip4->ip_hl = 5;
outip4->ip_tos = ds_ecn;
outip4->ip_len = htons(rte_pktmbuf_data_len(m));
outip4->ip_id = 0;
outip4->ip_off = 0;
outip4->ip_ttl = IPDEFTTL;
outip4->ip_p = IPPROTO_ESP;
outip4->ip_src.s_addr = src->ip.ip4;
outip4->ip_dst.s_addr = dst->ip.ip4;
m->packet_type &= ~RTE_PTYPE_L4_MASK;
return outip4;
}
static inline struct ip *
ip4ip_outbound(struct rte_mbuf *m, uint32_t offset,
struct ip_addr *src, struct ip_addr *dst)
{
return ipip_outbound(m, offset, 0, src, dst);
}
static inline struct ip6_hdr *
ip6ip_outbound(struct rte_mbuf *m, uint32_t offset,
struct ip_addr *src, struct ip_addr *dst)
{
return ipip_outbound(m, offset, 1, src, dst);
}
static inline void
ip4_ecn_setup(struct ip *ip4)
{
if (ip4->ip_tos & IPTOS_ECN_MASK) {
unsigned long sum;
uint8_t old;
old = ip4->ip_tos;
ip4->ip_tos |= IPTOS_ECN_CE;
sum = old + (~(*(uint8_t *)&ip4->ip_tos) & 0xff);
sum += rte_be_to_cpu_16(ip4->ip_sum);
sum = (sum & 0xffff) + (sum >> 16);
ip4->ip_sum = rte_cpu_to_be_16(sum + (sum >> 16));
}
}
static inline void
ip6_ecn_setup(struct ip6_hdr *ip6)
{
if ((ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK)
ip6->ip6_flow = htonl(ntohl(ip6->ip6_flow) |
(IPTOS_ECN_CE << 20));
}
static inline void
ipip_inbound(struct rte_mbuf *m, uint32_t offset)
{
struct ip *inip4, *outip4;
struct ip6_hdr *inip6, *outip6;
uint32_t ip_len, set_ecn;
outip4 = rte_pktmbuf_mtod(m, struct ip*);
RTE_ASSERT(outip4->ip_v == IPVERSION || outip4->ip_v == IP6_VERSION);
if (outip4->ip_v == IPVERSION) {
ip_len = sizeof(struct ip);
set_ecn = ((outip4->ip_tos & IPTOS_ECN_CE) == IPTOS_ECN_CE);
} else {
outip6 = (struct ip6_hdr *)outip4;
ip_len = sizeof(struct ip6_hdr);
set_ecn = ntohl(outip6->ip6_flow) >> 20;
set_ecn = ((set_ecn & IPTOS_ECN_CE) == IPTOS_ECN_CE);
}
inip4 = (struct ip *)rte_pktmbuf_adj(m, offset + ip_len);
RTE_ASSERT(inip4->ip_v == IPVERSION || inip4->ip_v == IP6_VERSION);
/* Check packet is still bigger than IP header (inner) */
RTE_ASSERT(rte_pktmbuf_pkt_len(m) > ip_len);
/* RFC4301 5.1.2.1 Note 6 */
if (inip4->ip_v == IPVERSION) {
if (set_ecn)
ip4_ecn_setup(inip4);
/* XXX This should be done by the forwarding engine instead */
inip4->ip_ttl -= 1;
if (inip4->ip_sum >= rte_cpu_to_be_16(0xffff - 0x100))
inip4->ip_sum += rte_cpu_to_be_16(0x100) + 1;
else
inip4->ip_sum += rte_cpu_to_be_16(0x100);
m->packet_type &= ~RTE_PTYPE_L4_MASK;
if (inip4->ip_p == IPPROTO_UDP)
m->packet_type |= RTE_PTYPE_L4_UDP;
else if (inip4->ip_p == IPPROTO_TCP)
m->packet_type |= RTE_PTYPE_L4_TCP;
} else {
inip6 = (struct ip6_hdr *)inip4;
if (set_ecn)
ip6_ecn_setup(inip6);
/* XXX This should be done by the forwarding engine instead */
inip6->ip6_hops -= 1;
}
}
#endif /* __IPIP_H__ */
|
