libnftnl 1.2.9
obj/synproxy.c
1#include <stdio.h>
2#include <stdint.h>
3#include <arpa/inet.h>
4#include <errno.h>
5#include <inttypes.h>
6
7#include <linux/netfilter/nf_tables.h>
8
9#include "internal.h"
10#include <libmnl/libmnl.h>
11#include <libnftnl/object.h>
12
13#include "obj.h"
14
15static int nftnl_obj_synproxy_set(struct nftnl_obj *e, uint16_t type,
16 const void *data, uint32_t data_len)
17{
18 struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
19
20 switch (type) {
21 case NFTNL_OBJ_SYNPROXY_MSS:
22 memcpy(&synproxy->mss, data, data_len);
23 break;
24 case NFTNL_OBJ_SYNPROXY_WSCALE:
25 memcpy(&synproxy->wscale, data, data_len);
26 break;
27 case NFTNL_OBJ_SYNPROXY_FLAGS:
28 memcpy(&synproxy->flags, data, data_len);
29 break;
30 }
31 return 0;
32}
33
34static const void *nftnl_obj_synproxy_get(const struct nftnl_obj *e,
35 uint16_t type, uint32_t *data_len)
36{
37 struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
38
39 switch (type) {
40 case NFTNL_OBJ_SYNPROXY_MSS:
41 *data_len = sizeof(synproxy->mss);
42 return &synproxy->mss;
43 case NFTNL_OBJ_SYNPROXY_WSCALE:
44 *data_len = sizeof(synproxy->wscale);
45 return &synproxy->wscale;
46 case NFTNL_OBJ_SYNPROXY_FLAGS:
47 *data_len = sizeof(synproxy->flags);
48 return &synproxy->flags;
49 }
50 return NULL;
51}
52
53static int nftnl_obj_synproxy_cb(const struct nlattr *attr, void *data)
54{
55 int type = mnl_attr_get_type(attr);
56 const struct nlattr **tb = data;
57
58 if (mnl_attr_type_valid(attr, NFTA_SYNPROXY_MAX) < 0)
59 return MNL_CB_OK;
60
61 switch (type) {
62 case NFTA_SYNPROXY_MSS:
63 if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
64 abi_breakage();
65 break;
66 case NFTA_SYNPROXY_WSCALE:
67 if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
68 abi_breakage();
69 break;
70 case NFTA_SYNPROXY_FLAGS:
71 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
72 abi_breakage();
73 break;
74 }
75
76 tb[type] = attr;
77 return MNL_CB_OK;
78}
79
80static void nftnl_obj_synproxy_build(struct nlmsghdr *nlh,
81 const struct nftnl_obj *e)
82{
83 struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
84
85 if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_MSS))
86 mnl_attr_put_u16(nlh, NFTA_SYNPROXY_MSS, htons(synproxy->mss));
87 if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_WSCALE))
88 mnl_attr_put_u8(nlh, NFTA_SYNPROXY_WSCALE, synproxy->wscale);
89 if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_FLAGS))
90 mnl_attr_put_u32(nlh, NFTA_SYNPROXY_FLAGS,
91 htonl(synproxy->flags));
92}
93
94static int nftnl_obj_synproxy_parse(struct nftnl_obj *e, struct nlattr *attr)
95{
96 struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
97 struct nlattr *tb[NFTA_SYNPROXY_MAX + 1] = {};
98
99 if (mnl_attr_parse_nested(attr, nftnl_obj_synproxy_cb, tb) < 0)
100 return -1;
101
102 if (tb[NFTA_SYNPROXY_MSS]) {
103 synproxy->mss = ntohs(mnl_attr_get_u16(tb[NFTA_SYNPROXY_MSS]));
104 e->flags |= (1 << NFTNL_OBJ_SYNPROXY_MSS);
105 }
106 if (tb[NFTA_SYNPROXY_WSCALE]) {
107 synproxy->wscale = mnl_attr_get_u8(tb[NFTA_SYNPROXY_WSCALE]);
108 e->flags |= (1 << NFTNL_OBJ_SYNPROXY_WSCALE);
109 }
110 if (tb[NFTA_SYNPROXY_FLAGS]) {
111 synproxy->flags = ntohl(mnl_attr_get_u32(tb[NFTA_SYNPROXY_FLAGS]));
112 e->flags |= (1 << NFTNL_OBJ_SYNPROXY_FLAGS);
113 }
114
115 return 0;
116}
117
118static int nftnl_obj_synproxy_snprintf(char *buf, size_t len,
119 uint32_t flags,
120 const struct nftnl_obj *e)
121{
122 struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
123 int ret, offset = 0;
124
125 if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_MSS) &&
126 e->flags & (1 << NFTNL_OBJ_SYNPROXY_WSCALE)) {
127 ret = snprintf(buf, len, "mss %u wscale %u ", synproxy->mss,
128 synproxy->wscale);
129 SNPRINTF_BUFFER_SIZE(ret, len, offset);
130 }
131
132 return offset;
133}
134
135static struct attr_policy obj_synproxy_attr_policy[__NFTNL_OBJ_SYNPROXY_MAX] = {
136 [NFTNL_OBJ_SYNPROXY_MSS] = { .maxlen = sizeof(uint16_t) },
137 [NFTNL_OBJ_SYNPROXY_WSCALE] = { .maxlen = sizeof(uint8_t) },
138 [NFTNL_OBJ_SYNPROXY_FLAGS] = { .maxlen = sizeof(uint32_t) },
139};
140
141struct obj_ops obj_ops_synproxy = {
142 .name = "synproxy",
143 .type = NFT_OBJECT_SYNPROXY,
144 .alloc_len = sizeof(struct nftnl_obj_synproxy),
145 .nftnl_max_attr = __NFTNL_OBJ_SYNPROXY_MAX - 1,
146 .attr_policy = obj_synproxy_attr_policy,
147 .set = nftnl_obj_synproxy_set,
148 .get = nftnl_obj_synproxy_get,
149 .parse = nftnl_obj_synproxy_parse,
150 .build = nftnl_obj_synproxy_build,
151 .output = nftnl_obj_synproxy_snprintf,
152};