1 /*
2 * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This code has been sponsored by Vyatta Inc. <http://www.vyatta.com>
10 */
11
12 #include "internal/internal.h"
13 #include <libmnl/libmnl.h>
14
nlmsg_parse_expection_attr_cb(const struct nlattr * attr,void * data)15 static int nlmsg_parse_expection_attr_cb(const struct nlattr *attr, void *data)
16 {
17 const struct nlattr **tb = data;
18 int type = mnl_attr_get_type(attr);
19
20 /* skip unsupported attribute in user-space */
21 if (mnl_attr_type_valid(attr, CTA_EXPECT_MAX) < 0)
22 return MNL_CB_OK;
23
24 switch(type) {
25 case CTA_EXPECT_MASTER:
26 case CTA_EXPECT_TUPLE:
27 case CTA_EXPECT_MASK:
28 if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
29 return MNL_CB_ERROR;
30 break;
31 case CTA_EXPECT_TIMEOUT:
32 case CTA_EXPECT_FLAGS:
33 case CTA_EXPECT_ID:
34 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
35 return MNL_CB_ERROR;
36 break;
37 case CTA_EXPECT_HELP_NAME:
38 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
39 return MNL_CB_ERROR;
40 break;
41 case CTA_EXPECT_ZONE:
42 if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
43 return MNL_CB_ERROR;
44 break;
45 }
46 tb[type] = attr;
47 return MNL_CB_OK;
48 }
49
nfexp_nlmsg_parse(const struct nlmsghdr * nlh,struct nf_expect * exp)50 int nfexp_nlmsg_parse(const struct nlmsghdr *nlh, struct nf_expect *exp)
51 {
52 struct nlattr *tb[CTA_EXPECT_MAX+1] = {};
53 struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
54
55 mnl_attr_parse(nlh, sizeof(struct nfgenmsg),
56 nlmsg_parse_expection_attr_cb, tb);
57
58 if (tb[CTA_EXPECT_MASTER]) {
59 exp->expected.orig.l3protonum = nfg->nfgen_family;
60 set_bit(ATTR_ORIG_L3PROTO, exp->expected.set);
61
62 nfct_parse_tuple(tb[CTA_EXPECT_MASTER], &exp->master.orig,
63 __DIR_ORIG, exp->master.set);
64 set_bit(ATTR_EXP_MASTER, exp->set);
65 }
66 if (tb[CTA_EXPECT_TUPLE]) {
67 exp->mask.orig.l3protonum = nfg->nfgen_family;
68 set_bit(ATTR_ORIG_L3PROTO, exp->mask.set);
69
70 nfct_parse_tuple(tb[CTA_EXPECT_TUPLE], &exp->expected.orig,
71 __DIR_ORIG, exp->expected.set);
72 set_bit(ATTR_EXP_EXPECTED, exp->set);
73 }
74 if (tb[CTA_EXPECT_MASK]) {
75 exp->master.orig.l3protonum = nfg->nfgen_family;
76 set_bit(ATTR_ORIG_L3PROTO, exp->master.set);
77
78 nfct_parse_tuple(tb[CTA_EXPECT_MASK], &exp->mask.orig,
79 __DIR_ORIG, exp->mask.set);
80 set_bit(ATTR_EXP_MASK, exp->set);
81 }
82 if (tb[CTA_EXPECT_TIMEOUT]) {
83 exp->timeout = ntohl(mnl_attr_get_u32(tb[CTA_EXPECT_TIMEOUT]));
84 set_bit(ATTR_EXP_TIMEOUT, exp->set);
85 }
86
87 if (tb[CTA_EXPECT_ZONE]) {
88 exp->zone = ntohs(mnl_attr_get_u16(tb[CTA_EXPECT_ZONE]));
89 set_bit(ATTR_EXP_ZONE, exp->set);
90 }
91
92 if (tb[CTA_EXPECT_FLAGS]) {
93 exp->flags = ntohl(mnl_attr_get_u32(tb[CTA_EXPECT_FLAGS]));
94 set_bit(ATTR_EXP_FLAGS, exp->set);
95 }
96
97 if (tb[CTA_EXPECT_HELP_NAME]) {
98 strncpy(exp->helper_name,
99 mnl_attr_get_str(tb[CTA_EXPECT_HELP_NAME]),
100 NFCT_HELPER_NAME_MAX);
101 set_bit(ATTR_EXP_HELPER_NAME, exp->set);
102 }
103 return 0;
104 }
105