libnl  3.7.0
cmp.c
1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3  * Copyright (c) 2008-2013 Thomas Graf <tgraf@suug.ch>
4  */
5 
6 /**
7  * @ingroup ematch
8  * @defgroup em_cmp Simple packet data comparison
9  *
10  * @{
11  */
12 
13 #include <netlink-private/netlink.h>
14 #include <netlink-private/tc.h>
15 #include <netlink/netlink.h>
16 #include <netlink/route/cls/ematch.h>
17 #include <netlink/route/cls/ematch/cmp.h>
18 #include <linux/tc_ematch/tc_em_cmp.h>
19 
20 void rtnl_ematch_cmp_set(struct rtnl_ematch *e, struct tcf_em_cmp *cfg)
21 {
22  memcpy(rtnl_ematch_data(e), cfg, sizeof(*cfg));
23 }
24 
25 struct tcf_em_cmp *rtnl_ematch_cmp_get(struct rtnl_ematch *e)
26 {
27  return rtnl_ematch_data(e);
28 }
29 
30 static int cmp_parse(struct rtnl_ematch *e, void *data, size_t len)
31 {
32  memcpy(rtnl_ematch_data(e), data, len);
33 
34  return 0;
35 }
36 
37 static const char *align_txt[] = {
38  [TCF_EM_ALIGN_U8] = "u8",
39  [TCF_EM_ALIGN_U16] = "u16",
40  [TCF_EM_ALIGN_U32] = "u32"
41 };
42 
43 static const char *layer_txt[] = {
44  [TCF_LAYER_LINK] = "eth",
45  [TCF_LAYER_NETWORK] = "ip",
46  [TCF_LAYER_TRANSPORT] = "tcp"
47 };
48 
49 static const char *operand_txt[] = {
50  [TCF_EM_OPND_EQ] = "=",
51  [TCF_EM_OPND_LT] = "<",
52  [TCF_EM_OPND_GT] = ">",
53 };
54 
55 static void cmp_dump(struct rtnl_ematch *e, struct nl_dump_params *p)
56 {
57  struct tcf_em_cmp *cmp = rtnl_ematch_data(e);
58 
59  if (cmp->flags & TCF_EM_CMP_TRANS)
60  nl_dump(p, "ntoh%c(", (cmp->align == TCF_EM_ALIGN_U32) ? 'l' : 's');
61 
62  nl_dump(p, "%s at %s+%u",
63  align_txt[cmp->align], layer_txt[cmp->layer], cmp->off);
64 
65  if (cmp->mask)
66  nl_dump(p, " & 0x%x", cmp->mask);
67 
68  if (cmp->flags & TCF_EM_CMP_TRANS)
69  nl_dump(p, ")");
70 
71  nl_dump(p, " %s %u", operand_txt[cmp->opnd], cmp->val);
72 }
73 
74 static struct rtnl_ematch_ops cmp_ops = {
75  .eo_kind = TCF_EM_CMP,
76  .eo_name = "cmp",
77  .eo_minlen = sizeof(struct tcf_em_cmp),
78  .eo_datalen = sizeof(struct tcf_em_cmp),
79  .eo_parse = cmp_parse,
80  .eo_dump = cmp_dump,
81 };
82 
83 static void __init cmp_init(void)
84 {
85  rtnl_ematch_register(&cmp_ops);
86 }
87 
88 /** @} */
int rtnl_ematch_register(struct rtnl_ematch_ops *ops)
Register ematch module.
Definition: ematch.c:40
void nl_dump(struct nl_dump_params *params, const char *fmt,...)
Dump a formatted character string.
Definition: utils.c:955
Dumping parameters.
Definition: types.h:28
Extended Match Operations.
Definition: ematch.h:28