libnl 3.5.0

cmp.c
1 /*
2 * lib/route/cls/ematch/cmp.c Simple packet data comparison ematch
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation version 2.1
7 * of the License.
8 *
9 * Copyright (c) 2008-2013 Thomas Graf <tgraf@suug.ch>
10 */
11
12 /**
13 * @ingroup ematch
14 * @defgroup em_cmp Simple packet data comparison
15 *
16 * @{
17 */
18
19 #include <netlink-private/netlink.h>
20 #include <netlink-private/tc.h>
21 #include <netlink/netlink.h>
22 #include <netlink/route/cls/ematch.h>
23 #include <netlink/route/cls/ematch/cmp.h>
24 #include <linux/tc_ematch/tc_em_cmp.h>
25
26 void rtnl_ematch_cmp_set(struct rtnl_ematch *e, struct tcf_em_cmp *cfg)
27 {
28 memcpy(rtnl_ematch_data(e), cfg, sizeof(*cfg));
29 }
30
31 struct tcf_em_cmp *rtnl_ematch_cmp_get(struct rtnl_ematch *e)
32 {
33 return rtnl_ematch_data(e);
34 }
35
36 static int cmp_parse(struct rtnl_ematch *e, void *data, size_t len)
37 {
38 memcpy(rtnl_ematch_data(e), data, len);
39
40 return 0;
41 }
42
43 static const char *align_txt[] = {
44 [TCF_EM_ALIGN_U8] = "u8",
45 [TCF_EM_ALIGN_U16] = "u16",
46 [TCF_EM_ALIGN_U32] = "u32"
47 };
48
49 static const char *layer_txt[] = {
50 [TCF_LAYER_LINK] = "eth",
51 [TCF_LAYER_NETWORK] = "ip",
52 [TCF_LAYER_TRANSPORT] = "tcp"
53 };
54
55 static const char *operand_txt[] = {
56 [TCF_EM_OPND_EQ] = "=",
57 [TCF_EM_OPND_LT] = "<",
58 [TCF_EM_OPND_GT] = ">",
59 };
60
61 static void cmp_dump(struct rtnl_ematch *e, struct nl_dump_params *p)
62 {
63 struct tcf_em_cmp *cmp = rtnl_ematch_data(e);
64
65 if (cmp->flags & TCF_EM_CMP_TRANS)
66 nl_dump(p, "ntoh%c(", (cmp->align == TCF_EM_ALIGN_U32) ? 'l' : 's');
67
68 nl_dump(p, "%s at %s+%u",
69 align_txt[cmp->align], layer_txt[cmp->layer], cmp->off);
70
71 if (cmp->mask)
72 nl_dump(p, " & 0x%x", cmp->mask);
73
74 if (cmp->flags & TCF_EM_CMP_TRANS)
75 nl_dump(p, ")");
76
77 nl_dump(p, " %s %u", operand_txt[cmp->opnd], cmp->val);
78 }
79
80 static struct rtnl_ematch_ops cmp_ops = {
81 .eo_kind = TCF_EM_CMP,
82 .eo_name = "cmp",
83 .eo_minlen = sizeof(struct tcf_em_cmp),
84 .eo_datalen = sizeof(struct tcf_em_cmp),
85 .eo_parse = cmp_parse,
86 .eo_dump = cmp_dump,
87 };
88
89 static void __init cmp_init(void)
90 {
91 rtnl_ematch_register(&cmp_ops);
92 }
93
94 /** @} */
rtnl_ematch_register
int rtnl_ematch_register(struct rtnl_ematch_ops *ops)
Register ematch module.
Definition: ematch.c:46
nl_dump_params
Dumping parameters.
Definition: types.h:33
nl_dump
void nl_dump(struct nl_dump_params *params, const char *fmt,...)
Dump a formatted character string.
Definition: utils.c:962
rtnl_ematch_ops
Extended Match Operations.
Definition: ematch.h:33