mvebu: initial support for Marvell Armada 7k and 8k DB boards
[openwrt/openwrt.git] / package / libs / libnftnl / patches / 101-expr-add-flow-offload-expression.patch
1 From: Pablo Neira Ayuso <pablo@netfilter.org>
2 Date: Sun, 3 Dec 2017 21:05:54 +0100
3 Subject: [PATCH] expr: add flow offload expression
4
5 This patch adds the new "flow_offload" expression to select what flows
6 are offloaded to an existing flowtable.
7
8 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
9 ---
10 create mode 100644 src/expr/flow_offload.c
11
12 --- a/include/libnftnl/expr.h
13 +++ b/include/libnftnl/expr.h
14 @@ -221,6 +221,10 @@ enum {
15 };
16
17 enum {
18 + NFTNL_EXPR_FLOW_TABLE_NAME = NFTNL_EXPR_BASE,
19 +};
20 +
21 +enum {
22 NFTNL_EXPR_FWD_SREG_DEV = NFTNL_EXPR_BASE,
23 };
24
25 --- a/include/linux/netfilter/nf_tables.h
26 +++ b/include/linux/netfilter/nf_tables.h
27 @@ -952,6 +952,17 @@ enum nft_ct_attributes {
28 };
29 #define NFTA_CT_MAX (__NFTA_CT_MAX - 1)
30
31 +/**
32 + * enum nft_flow_attributes - ct offload expression attributes
33 + * @NFTA_FLOW_TABLE_NAME: flow table name (NLA_STRING)
34 + */
35 +enum nft_offload_attributes {
36 + NFTA_FLOW_UNSPEC,
37 + NFTA_FLOW_TABLE_NAME,
38 + __NFTA_FLOW_MAX,
39 +};
40 +#define NFTA_FLOW_MAX (__NFTA_FLOW_MAX - 1)
41 +
42 enum nft_limit_type {
43 NFT_LIMIT_PKTS,
44 NFT_LIMIT_PKT_BYTES
45 --- a/src/Makefile.am
46 +++ b/src/Makefile.am
47 @@ -32,6 +32,7 @@ libnftnl_la_SOURCES = utils.c \
48 expr/data_reg.c \
49 expr/dup.c \
50 expr/exthdr.c \
51 + expr/flow_offload.c \
52 expr/fib.c \
53 expr/fwd.c \
54 expr/limit.c \
55 --- /dev/null
56 +++ b/src/expr/flow_offload.c
57 @@ -0,0 +1,184 @@
58 +#include "internal.h"
59 +
60 +#include <stdio.h>
61 +#include <stdint.h>
62 +#include <string.h> /* for memcpy */
63 +#include <arpa/inet.h>
64 +#include <errno.h>
65 +#include <libmnl/libmnl.h>
66 +#include <linux/netfilter/nf_tables.h>
67 +#include <libnftnl/rule.h>
68 +#include <libnftnl/expr.h>
69 +
70 +struct nftnl_expr_flow {
71 + char *table_name;
72 +};
73 +
74 +static int nftnl_expr_flow_set(struct nftnl_expr *e, uint16_t type,
75 + const void *data, uint32_t data_len)
76 +{
77 + struct nftnl_expr_flow *flow = nftnl_expr_data(e);
78 +
79 + switch (type) {
80 + case NFTNL_EXPR_FLOW_TABLE_NAME:
81 + flow->table_name = strdup((const char *)data);
82 + if (!flow->table_name)
83 + return -1;
84 + break;
85 + default:
86 + return -1;
87 + }
88 + return 0;
89 +}
90 +
91 +static const void *nftnl_expr_flow_get(const struct nftnl_expr *e,
92 + uint16_t type, uint32_t *data_len)
93 +{
94 + struct nftnl_expr_flow *flow = nftnl_expr_data(e);
95 +
96 + switch(type) {
97 + case NFTNL_EXPR_FLOW_TABLE_NAME:
98 + *data_len = strlen(flow->table_name) + 1;
99 + return flow->table_name;
100 + }
101 + return NULL;
102 +}
103 +
104 +static int nftnl_expr_flow_cb(const struct nlattr *attr, void *data)
105 +{
106 + const struct nlattr **tb = data;
107 + int type = mnl_attr_get_type(attr);
108 +
109 + if (mnl_attr_type_valid(attr, NFTA_FLOW_MAX) < 0)
110 + return MNL_CB_OK;
111 +
112 + switch(type) {
113 + case NFTA_FLOW_TABLE_NAME:
114 + if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
115 + abi_breakage();
116 + break;
117 + }
118 +
119 + tb[type] = attr;
120 + return MNL_CB_OK;
121 +}
122 +
123 +static void nftnl_expr_flow_build(struct nlmsghdr *nlh,
124 + const struct nftnl_expr *e)
125 +{
126 + struct nftnl_expr_flow *flow = nftnl_expr_data(e);
127 +
128 + if (e->flags & (1 << NFTNL_EXPR_FLOW_TABLE_NAME))
129 + mnl_attr_put_strz(nlh, NFTA_FLOW_TABLE_NAME, flow->table_name);
130 +}
131 +
132 +static int nftnl_expr_flow_parse(struct nftnl_expr *e, struct nlattr *attr)
133 +{
134 + struct nftnl_expr_flow *flow = nftnl_expr_data(e);
135 + struct nlattr *tb[NFTA_FLOW_MAX+1] = {};
136 + int ret = 0;
137 +
138 + if (mnl_attr_parse_nested(attr, nftnl_expr_flow_cb, tb) < 0)
139 + return -1;
140 +
141 + if (tb[NFTA_FLOW_TABLE_NAME]) {
142 + flow->table_name =
143 + strdup(mnl_attr_get_str(tb[NFTA_FLOW_TABLE_NAME]));
144 + if (!flow->table_name)
145 + return -1;
146 + e->flags |= (1 << NFTNL_EXPR_FLOW_TABLE_NAME);
147 + }
148 +
149 + return ret;
150 +}
151 +
152 +static int
153 +nftnl_expr_flow_json_parse(struct nftnl_expr *e, json_t *root,
154 + struct nftnl_parse_err *err)
155 +{
156 +#ifdef JSON_PARSING
157 + const char *table_name;
158 +
159 + table_name = nftnl_jansson_parse_str(root, "flowtable", err);
160 + if (table_name != NULL)
161 + nftnl_expr_set_str(e, NFTNL_EXPR_FLOW_TABLE_NAME, table_name);
162 +
163 + return 0;
164 +#else
165 + errno = EOPNOTSUPP;
166 + return -1;
167 +#endif
168 +}
169 +
170 +static int nftnl_expr_flow_export(char *buf, size_t size,
171 + const struct nftnl_expr *e, int type)
172 +{
173 + struct nftnl_expr_flow *l = nftnl_expr_data(e);
174 + NFTNL_BUF_INIT(b, buf, size);
175 +
176 + if (e->flags & (1 << NFTNL_EXPR_FLOW_TABLE_NAME))
177 + nftnl_buf_str(&b, type, l->table_name, SET);
178 +
179 + return nftnl_buf_done(&b);
180 +}
181 +
182 +static int nftnl_expr_flow_snprintf_default(char *buf, size_t size,
183 + const struct nftnl_expr *e)
184 +{
185 + int remain = size, offset = 0, ret;
186 + struct nftnl_expr_flow *l = nftnl_expr_data(e);
187 +
188 + ret = snprintf(buf, remain, "flowtable %s ", l->table_name);
189 + SNPRINTF_BUFFER_SIZE(ret, remain, offset);
190 +
191 + return offset;
192 +}
193 +
194 +static int nftnl_expr_flow_snprintf(char *buf, size_t size, uint32_t type,
195 + uint32_t flags, const struct nftnl_expr *e)
196 +{
197 + switch(type) {
198 + case NFTNL_OUTPUT_DEFAULT:
199 + return nftnl_expr_flow_snprintf_default(buf, size, e);
200 + case NFTNL_OUTPUT_XML:
201 + case NFTNL_OUTPUT_JSON:
202 + return nftnl_expr_flow_export(buf, size, e, type);
203 + default:
204 + break;
205 + }
206 + return -1;
207 +}
208 +
209 +static void nftnl_expr_flow_free(const struct nftnl_expr *e)
210 +{
211 + struct nftnl_expr_flow *flow = nftnl_expr_data(e);
212 +
213 + xfree(flow->table_name);
214 +}
215 +
216 +static bool nftnl_expr_flow_cmp(const struct nftnl_expr *e1,
217 + const struct nftnl_expr *e2)
218 +{
219 + struct nftnl_expr_flow *l1 = nftnl_expr_data(e1);
220 + struct nftnl_expr_flow *l2 = nftnl_expr_data(e2);
221 + bool eq = true;
222 +
223 + if (e1->flags & (1 << NFTNL_EXPR_FLOW_TABLE_NAME))
224 + eq &= !strcmp(l1->table_name, l2->table_name);
225 +
226 + return eq;
227 +}
228 +
229 +struct expr_ops expr_ops_flow = {
230 + .name = "flow_offload",
231 + .alloc_len = sizeof(struct nftnl_expr_flow),
232 + .max_attr = NFTA_FLOW_MAX,
233 + .free = nftnl_expr_flow_free,
234 + .cmp = nftnl_expr_flow_cmp,
235 + .set = nftnl_expr_flow_set,
236 + .get = nftnl_expr_flow_get,
237 + .parse = nftnl_expr_flow_parse,
238 + .build = nftnl_expr_flow_build,
239 + .snprintf = nftnl_expr_flow_snprintf,
240 + .json_parse = nftnl_expr_flow_json_parse,
241 +};
242 --- a/src/expr_ops.c
243 +++ b/src/expr_ops.c
244 @@ -33,6 +33,7 @@ extern struct expr_ops expr_ops_target;
245 extern struct expr_ops expr_ops_dynset;
246 extern struct expr_ops expr_ops_hash;
247 extern struct expr_ops expr_ops_fib;
248 +extern struct expr_ops expr_ops_flow;
249
250 static struct expr_ops expr_ops_notrack = {
251 .name = "notrack",
252 @@ -69,6 +70,7 @@ static struct expr_ops *expr_ops[] = {
253 &expr_ops_hash,
254 &expr_ops_fib,
255 &expr_ops_objref,
256 + &expr_ops_flow,
257 NULL,
258 };
259