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
|
#include <u.h>
#include <libc.h>
#include <ip.h>
#include "dat.h"
#include "protos.h"
typedef struct Hdr Hdr;
struct Hdr
{
uchar sum[2]; /* Checksum including header */
uchar len[2]; /* Packet length */
uchar type; /* Packet type */
uchar spec; /* Special */
uchar sport[2]; /* Src port */
uchar dport[2]; /* Dst port */
uchar id[4]; /* Sequence id */
uchar ack[4]; /* Acked sequence */
};
enum
{
ILLEN= 18
};
enum
{
Os,
Od,
Osd
};
static Field p_fields[] =
{
{"s", Fnum, Os, "source port", } ,
{"d", Fnum, Od, "dest port", } ,
{"a", Fnum, Osd, "source/dest port", } ,
{"sd", Fnum, Osd, "source/dest port", } ,
{0}
};
static Mux p_mux[] =
{
{"ninep", 17007, }, /* exportfs */
{"ninep", 17008, }, /* 9fs */
{"ninep", 17005, }, /* ocpu */
{"ninep", 17010, }, /* ncpu */
{"ninep", 17013, }, /* cpu */
{0}
};
static void
p_compile(Filter *f)
{
Mux *m;
if(f->op == '='){
compile_cmp(udp.name, f, p_fields);
return;
}
for(m = p_mux; m->name != nil; m++)
if(strcmp(f->s, m->name) == 0){
f->pr = m->pr;
f->ulv = m->val;
f->subop = Osd;
return;
}
sysfatal("unknown il field or protocol: %s", f->s);
}
static int
p_filter(Filter *f, Msg *m)
{
Hdr *h;
if(m->pe - m->ps < ILLEN)
return 0;
h = (Hdr*)m->ps;
m->ps += ILLEN;
switch(f->subop){
case Os:
return NetS(h->sport) == f->ulv;
case Od:
return NetS(h->dport) == f->ulv;
case Osd:
return NetS(h->sport) == f->ulv || NetS(h->dport) == f->ulv;
}
return 0;
}
char *pktnames[] =
{
"Sync",
"Data",
"Dataquery",
"Ack",
"Query",
"State",
"Close"
};
static char*
pkttype(int t)
{
static char b[10];
if(t > 6){
sprint(b, "%d", t);
return b;
}
return pktnames[t];
}
static int
p_seprint(Msg *m)
{
Hdr *h;
int dport, sport;
if(m->pe - m->ps < ILLEN)
return -1;
h = (Hdr*)m->ps;
m->ps += ILLEN;
dport = NetS(h->dport);
sport = NetS(h->sport);
demux(p_mux, sport, dport, m, &dump);
m->p = seprint(m->p, m->e, "s=%d d=%d t=%s id=%lud ack=%lud spec=%d ck=%4.4ux ln=%d",
sport, dport, pkttype(h->type),
(ulong)NetL(h->id), (ulong)NetL(h->ack),
h->spec,
NetS(h->sum), NetS(h->len));
return 0;
}
Proto il =
{
"il",
p_compile,
p_filter,
p_seprint,
p_mux,
"%lud",
p_fields,
defaultframer
};
|