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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/* $NetBSD: in6_offload.c,v 1.6 2011/04/25 22:07:57 yamt Exp $ */
/*-
* Copyright (c)2006 YAMAMOTO Takashi,
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: in6_offload.c,v 1.6 2011/04/25 22:07:57 yamt Exp $");
#include <sys/param.h>
#include <sys/mbuf.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip6.h>
#include <netinet/tcp.h>
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/in6_offload.h>
struct ip6_tso_output_args {
struct ifnet *ifp;
struct ifnet *origifp;
const struct sockaddr_in6 *dst;
struct rtentry *rt;
};
static int ip6_tso_output_callback(void *, struct mbuf *);
static int
ip6_tso_output_callback(void *vp, struct mbuf *m)
{
struct ip6_tso_output_args *args = vp;
return nd6_output(args->ifp, args->origifp, m, args->dst, args->rt);
}
int
ip6_tso_output(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m,
const struct sockaddr_in6 *dst, struct rtentry *rt)
{
struct ip6_tso_output_args args;
args.ifp = ifp;
args.origifp = origifp;
args.dst = dst;
args.rt = rt;
return tcp6_segment(m, ip6_tso_output_callback, &args);
}
/*
* tcp6_segment: handle M_CSUM_TSOv6 by software.
*
* => always consume m.
* => call output_func with output_arg for each segments.
*/
int
tcp6_segment(struct mbuf *m, int (*output_func)(void *, struct mbuf *),
void *output_arg)
{
int mss;
int iphlen;
int thlen;
int hlen;
int len;
struct ip6_hdr *iph;
struct tcphdr *th;
uint32_t tcpseq;
struct mbuf *hdr = NULL;
struct mbuf *t;
int error = 0;
KASSERT((m->m_flags & M_PKTHDR) != 0);
KASSERT((m->m_pkthdr.csum_flags & M_CSUM_TSOv6) != 0);
m->m_pkthdr.csum_flags = 0;
len = m->m_pkthdr.len;
KASSERT(len >= sizeof(*iph) + sizeof(*th));
if (m->m_len < sizeof(*iph)) {
m = m_pullup(m, sizeof(*iph));
if (m == NULL) {
error = ENOMEM;
goto quit;
}
}
iph = mtod(m, struct ip6_hdr *);
iphlen = sizeof(*iph);
KASSERT((iph->ip6_vfc & IPV6_VERSION_MASK) == IPV6_VERSION);
KASSERT(iph->ip6_nxt == IPPROTO_TCP);
hlen = iphlen + sizeof(*th);
if (m->m_len < hlen) {
m = m_pullup(m, hlen);
if (m == NULL) {
error = ENOMEM;
goto quit;
}
}
th = (void *)(mtod(m, char *) + iphlen);
tcpseq = ntohl(th->th_seq);
thlen = th->th_off * 4;
hlen = iphlen + thlen;
mss = m->m_pkthdr.segsz;
KASSERT(mss != 0);
KASSERT(len > hlen);
t = m_split(m, hlen, M_NOWAIT);
if (t == NULL) {
error = ENOMEM;
goto quit;
}
hdr = m;
m = t;
len -= hlen;
KASSERT(len % mss == 0);
while (len > 0) {
struct mbuf *n;
n = m_dup(hdr, 0, hlen, M_NOWAIT);
if (n == NULL) {
error = ENOMEM;
goto quit;
}
KASSERT(n->m_len == hlen); /* XXX */
t = m_split(m, mss, M_NOWAIT);
if (t == NULL) {
m_freem(n);
error = ENOMEM;
goto quit;
}
m_cat(n, m);
m = t;
KASSERT(n->m_len >= hlen); /* XXX */
n->m_pkthdr.len = hlen + mss;
iph = mtod(n, struct ip6_hdr *);
KASSERT((iph->ip6_vfc & IPV6_VERSION_MASK) == IPV6_VERSION);
iph->ip6_plen = htons(thlen + mss);
th = (void *)(mtod(n, char *) + iphlen);
th->th_seq = htonl(tcpseq);
th->th_sum = 0;
th->th_sum = in6_cksum(n, IPPROTO_TCP, iphlen, thlen + mss);
error = (*output_func)(output_arg, n);
if (error) {
goto quit;
}
tcpseq += mss;
len -= mss;
}
quit:
if (hdr != NULL) {
m_freem(hdr);
}
if (m != NULL) {
m_freem(m);
}
return error;
}
void
ip6_undefer_csum(struct mbuf *m, size_t hdrlen, int csum_flags)
{
const size_t ip6_plen_offset =
hdrlen + offsetof(struct ip6_hdr, ip6_plen);
size_t l4hdroff;
size_t l4offset;
uint16_t plen;
uint16_t csum;
KASSERT(m->m_flags & M_PKTHDR);
KASSERT((m->m_pkthdr.csum_flags & csum_flags) == csum_flags);
KASSERT(csum_flags == M_CSUM_UDPv6 || csum_flags == M_CSUM_TCPv6);
if (__predict_true(hdrlen + sizeof(struct ip6_hdr) <= m->m_len)) {
plen = *(uint16_t *)(mtod(m, char *) + ip6_plen_offset);
} else {
m_copydata(m, ip6_plen_offset, sizeof(plen), &plen);
}
plen = ntohs(plen);
l4hdroff = M_CSUM_DATA_IPv6_HL(m->m_pkthdr.csum_data);
l4offset = hdrlen + l4hdroff;
csum = in6_cksum(m, 0, l4offset, plen - l4hdroff);
if (csum == 0 && (csum_flags & M_CSUM_UDPv6) != 0)
csum = 0xffff;
l4offset += M_CSUM_DATA_IPv6_OFFSET(m->m_pkthdr.csum_data);
if (__predict_true((l4offset + sizeof(uint16_t)) <= m->m_len)) {
*(uint16_t *)(mtod(m, char *) + l4offset) = csum;
} else {
m_copyback(m, l4offset, sizeof(csum), (void *) &csum);
}
m->m_pkthdr.csum_flags ^= csum_flags;
}
|