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 <linux/tc_ematch/tc_em_cmp.h>
24
rtnl_ematch_cmp_set(struct rtnl_ematch * e,struct tcf_em_cmp * cfg)25 void rtnl_ematch_cmp_set(struct rtnl_ematch *e, struct tcf_em_cmp *cfg)
26 {
27 memcpy(rtnl_ematch_data(e), cfg, sizeof(*cfg));
28 }
29
rtnl_ematch_cmp_get(struct rtnl_ematch * e)30 struct tcf_em_cmp *rtnl_ematch_cmp_get(struct rtnl_ematch *e)
31 {
32 return rtnl_ematch_data(e);
33 }
34
cmp_parse(struct rtnl_ematch * e,void * data,size_t len)35 static int cmp_parse(struct rtnl_ematch *e, void *data, size_t len)
36 {
37 memcpy(rtnl_ematch_data(e), data, len);
38
39 return 0;
40 }
41
42 static const char *align_txt[] = {
43 [TCF_EM_ALIGN_U8] = "u8",
44 [TCF_EM_ALIGN_U16] = "u16",
45 [TCF_EM_ALIGN_U32] = "u32"
46 };
47
48 static const char *layer_txt[] = {
49 [TCF_LAYER_LINK] = "eth",
50 [TCF_LAYER_NETWORK] = "ip",
51 [TCF_LAYER_TRANSPORT] = "tcp"
52 };
53
54 static const char *operand_txt[] = {
55 [TCF_EM_OPND_EQ] = "=",
56 [TCF_EM_OPND_LT] = "<",
57 [TCF_EM_OPND_GT] = ">",
58 };
59
cmp_dump(struct rtnl_ematch * e,struct nl_dump_params * p)60 static void cmp_dump(struct rtnl_ematch *e, struct nl_dump_params *p)
61 {
62 struct tcf_em_cmp *cmp = rtnl_ematch_data(e);
63
64 if (cmp->flags & TCF_EM_CMP_TRANS)
65 nl_dump(p, "ntoh%c(", (cmp->align == TCF_EM_ALIGN_U32) ? 'l' : 's');
66
67 nl_dump(p, "%s at %s+%u",
68 align_txt[cmp->align], layer_txt[cmp->layer], cmp->off);
69
70 if (cmp->mask)
71 nl_dump(p, " & 0x%x", cmp->mask);
72
73 if (cmp->flags & TCF_EM_CMP_TRANS)
74 nl_dump(p, ")");
75
76 nl_dump(p, " %s %u", operand_txt[cmp->opnd], cmp->val);
77 }
78
79 static struct rtnl_ematch_ops cmp_ops = {
80 .eo_kind = TCF_EM_CMP,
81 .eo_name = "cmp",
82 .eo_minlen = sizeof(struct tcf_em_cmp),
83 .eo_datalen = sizeof(struct tcf_em_cmp),
84 .eo_parse = cmp_parse,
85 .eo_dump = cmp_dump,
86 };
87
cmp_init(void)88 static void __init cmp_init(void)
89 {
90 rtnl_ematch_register(&cmp_ops);
91 }
92
93 /** @} */
94