1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_FLOW_DISSECTOR_H
3 #define _NET_FLOW_DISSECTOR_H
5 #include <linux/types.h>
7 #include <linux/siphash.h>
8 #include <linux/string.h>
9 #include <uapi/linux/if_ether.h>
12 * struct flow_dissector_key_control:
13 * @thoff: Transport header offset
15 struct flow_dissector_key_control {
21 #define FLOW_DIS_IS_FRAGMENT BIT(0)
22 #define FLOW_DIS_FIRST_FRAG BIT(1)
23 #define FLOW_DIS_ENCAPSULATION BIT(2)
25 enum flow_dissect_ret {
26 FLOW_DISSECT_RET_OUT_GOOD,
27 FLOW_DISSECT_RET_OUT_BAD,
28 FLOW_DISSECT_RET_PROTO_AGAIN,
29 FLOW_DISSECT_RET_IPPROTO_AGAIN,
30 FLOW_DISSECT_RET_CONTINUE,
34 * struct flow_dissector_key_basic:
35 * @thoff: Transport header offset
36 * @n_proto: Network header protocol (eg. IPv4/IPv6)
37 * @ip_proto: Transport header protocol (eg. TCP/UDP)
39 struct flow_dissector_key_basic {
45 struct flow_dissector_key_tags {
49 struct flow_dissector_key_vlan {
55 struct flow_dissector_key_mpls {
62 #define FLOW_DIS_TUN_OPTS_MAX 255
64 * struct flow_dissector_key_enc_opts:
65 * @data: tunnel option data
66 * @len: length of tunnel option data
67 * @dst_opt_type: tunnel option type
69 struct flow_dissector_key_enc_opts {
70 u8 data[FLOW_DIS_TUN_OPTS_MAX]; /* Using IP_TUNNEL_OPTS_MAX is desired
71 * here but seems difficult to #include
77 struct flow_dissector_key_keyid {
82 * struct flow_dissector_key_ipv4_addrs:
83 * @src: source ip address
84 * @dst: destination ip address
86 struct flow_dissector_key_ipv4_addrs {
87 /* (src,dst) must be grouped, in the same way than in IP header */
93 * struct flow_dissector_key_ipv6_addrs:
94 * @src: source ip address
95 * @dst: destination ip address
97 struct flow_dissector_key_ipv6_addrs {
98 /* (src,dst) must be grouped, in the same way than in IP header */
104 * struct flow_dissector_key_tipc:
105 * @key: source node address combined with selector
107 struct flow_dissector_key_tipc {
112 * struct flow_dissector_key_addrs:
113 * @v4addrs: IPv4 addresses
114 * @v6addrs: IPv6 addresses
116 struct flow_dissector_key_addrs {
118 struct flow_dissector_key_ipv4_addrs v4addrs;
119 struct flow_dissector_key_ipv6_addrs v6addrs;
120 struct flow_dissector_key_tipc tipckey;
125 * flow_dissector_key_arp:
126 * @ports: Operation, source and target addresses for an ARP header
127 * for Ethernet hardware addresses and IPv4 protocol addresses
128 * sip: Sender IP address
129 * tip: Target IP address
131 * sha: Sender hardware address
132 * tpa: Target hardware address
134 struct flow_dissector_key_arp {
138 unsigned char sha[ETH_ALEN];
139 unsigned char tha[ETH_ALEN];
143 * flow_dissector_key_tp_ports:
144 * @ports: port numbers of Transport header
145 * src: source port number
146 * dst: destination port number
148 struct flow_dissector_key_ports {
159 * flow_dissector_key_icmp:
160 * @ports: type and code of ICMP header
161 * icmp: ICMP type (high) and code (low)
165 struct flow_dissector_key_icmp {
176 * struct flow_dissector_key_eth_addrs:
177 * @src: source Ethernet address
178 * @dst: destination Ethernet address
180 struct flow_dissector_key_eth_addrs {
181 /* (dst,src) must be grouped, in the same way than in ETH header */
182 unsigned char dst[ETH_ALEN];
183 unsigned char src[ETH_ALEN];
187 * struct flow_dissector_key_tcp:
190 struct flow_dissector_key_tcp {
195 * struct flow_dissector_key_ip:
199 struct flow_dissector_key_ip {
204 enum flow_dissector_key_id {
205 FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
206 FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
207 FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
208 FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
209 FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
210 FLOW_DISSECTOR_KEY_ICMP, /* struct flow_dissector_key_icmp */
211 FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
212 FLOW_DISSECTOR_KEY_TIPC, /* struct flow_dissector_key_tipc */
213 FLOW_DISSECTOR_KEY_ARP, /* struct flow_dissector_key_arp */
214 FLOW_DISSECTOR_KEY_VLAN, /* struct flow_dissector_key_flow_vlan */
215 FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_tags */
216 FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */
217 FLOW_DISSECTOR_KEY_MPLS_ENTROPY, /* struct flow_dissector_key_keyid */
218 FLOW_DISSECTOR_KEY_ENC_KEYID, /* struct flow_dissector_key_keyid */
219 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
220 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
221 FLOW_DISSECTOR_KEY_ENC_CONTROL, /* struct flow_dissector_key_control */
222 FLOW_DISSECTOR_KEY_ENC_PORTS, /* struct flow_dissector_key_ports */
223 FLOW_DISSECTOR_KEY_MPLS, /* struct flow_dissector_key_mpls */
224 FLOW_DISSECTOR_KEY_TCP, /* struct flow_dissector_key_tcp */
225 FLOW_DISSECTOR_KEY_IP, /* struct flow_dissector_key_ip */
226 FLOW_DISSECTOR_KEY_CVLAN, /* struct flow_dissector_key_flow_vlan */
227 FLOW_DISSECTOR_KEY_ENC_IP, /* struct flow_dissector_key_ip */
228 FLOW_DISSECTOR_KEY_ENC_OPTS, /* struct flow_dissector_key_enc_opts */
230 FLOW_DISSECTOR_KEY_MAX,
233 #define FLOW_DISSECTOR_F_PARSE_1ST_FRAG BIT(0)
234 #define FLOW_DISSECTOR_F_STOP_AT_L3 BIT(1)
235 #define FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL BIT(2)
236 #define FLOW_DISSECTOR_F_STOP_AT_ENCAP BIT(3)
238 struct flow_dissector_key {
239 enum flow_dissector_key_id key_id;
240 size_t offset; /* offset of struct flow_dissector_key_*
241 in target the struct */
244 struct flow_dissector {
245 unsigned int used_keys; /* each bit repesents presence of one key id */
246 unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
249 struct flow_keys_basic {
250 struct flow_dissector_key_control control;
251 struct flow_dissector_key_basic basic;
255 struct flow_dissector_key_control control;
256 #define FLOW_KEYS_HASH_START_FIELD basic
257 struct flow_dissector_key_basic basic __aligned(SIPHASH_ALIGNMENT);
258 struct flow_dissector_key_tags tags;
259 struct flow_dissector_key_vlan vlan;
260 struct flow_dissector_key_vlan cvlan;
261 struct flow_dissector_key_keyid keyid;
262 struct flow_dissector_key_ports ports;
263 struct flow_dissector_key_addrs addrs;
266 #define FLOW_KEYS_HASH_OFFSET \
267 offsetof(struct flow_keys, FLOW_KEYS_HASH_START_FIELD)
269 __be32 flow_get_u32_src(const struct flow_keys *flow);
270 __be32 flow_get_u32_dst(const struct flow_keys *flow);
272 extern struct flow_dissector flow_keys_dissector;
273 extern struct flow_dissector flow_keys_basic_dissector;
275 /* struct flow_keys_digest:
277 * This structure is used to hold a digest of the full flow keys. This is a
278 * larger "hash" of a flow to allow definitively matching specific flows where
279 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
280 * that it can be used in CB of skb (see sch_choke for an example).
282 #define FLOW_KEYS_DIGEST_LEN 16
283 struct flow_keys_digest {
284 u8 data[FLOW_KEYS_DIGEST_LEN];
287 void make_flow_keys_digest(struct flow_keys_digest *digest,
288 const struct flow_keys *flow);
290 static inline bool flow_keys_have_l4(const struct flow_keys *keys)
292 return (keys->ports.ports || keys->tags.flow_label);
295 u32 flow_hash_from_keys(struct flow_keys *keys);
297 static inline bool dissector_uses_key(const struct flow_dissector *flow_dissector,
298 enum flow_dissector_key_id key_id)
300 return flow_dissector->used_keys & (1 << key_id);
303 static inline void *skb_flow_dissector_target(struct flow_dissector *flow_dissector,
304 enum flow_dissector_key_id key_id,
305 void *target_container)
307 return ((char *)target_container) + flow_dissector->offset[key_id];
311 flow_dissector_init_keys(struct flow_dissector_key_control *key_control,
312 struct flow_dissector_key_basic *key_basic)
314 memset(key_control, 0, sizeof(*key_control));
315 memset(key_basic, 0, sizeof(*key_basic));