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84e54fe0 WT |
1 | #ifndef __LINUX_ERSPAN_H |
2 | #define __LINUX_ERSPAN_H | |
3 | ||
4 | /* | |
f989d546 WT |
5 | * GRE header for ERSPAN type I encapsulation (4 octets [34:37]) |
6 | * 0 1 2 3 | |
7 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
8 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
9 | * |0|0|0|0|0|00000|000000000|00000| Protocol Type for ERSPAN | | |
10 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
11 | * | |
12 | * The Type I ERSPAN frame format is based on the barebones IP + GRE | |
13 | * encapsulation (as described above) on top of the raw mirrored frame. | |
14 | * There is no extra ERSPAN header. | |
15 | * | |
16 | * | |
17 | * GRE header for ERSPAN type II and II encapsulation (8 octets [34:41]) | |
84e54fe0 WT |
18 | * 0 1 2 3 |
19 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
20 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
21 | * |0|0|0|1|0|00000|000000000|00000| Protocol Type for ERSPAN | | |
22 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
23 | * | Sequence Number (increments per packet per session) | | |
24 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
25 | * | |
26 | * Note that in the above GRE header [RFC1701] out of the C, R, K, S, | |
27 | * s, Recur, Flags, Version fields only S (bit 03) is set to 1. The | |
28 | * other fields are set to zero, so only a sequence number follows. | |
29 | * | |
1d7e2ed2 | 30 | * ERSPAN Version 1 (Type II) header (8 octets [42:49]) |
84e54fe0 WT |
31 | * 0 1 2 3 |
32 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
33 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
34 | * | Ver | VLAN | COS | En|T| Session ID | | |
35 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
36 | * | Reserved | Index | | |
37 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
38 | * | |
f551c91d WT |
39 | * |
40 | * ERSPAN Version 2 (Type III) header (12 octets [42:49]) | |
41 | * 0 1 2 3 | |
42 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
43 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
44 | * | Ver | VLAN | COS |BSO|T| Session ID | | |
45 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
46 | * | Timestamp | | |
47 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
48 | * | SGT |P| FT | Hw ID |D|Gra|O| | |
49 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
50 | * | |
51 | * Platform Specific SubHeader (8 octets, optional) | |
52 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
53 | * | Platf ID | Platform Specific Info | | |
54 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
55 | * | Platform Specific Info | | |
56 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
57 | * | |
f989d546 | 58 | * GRE proto ERSPAN type I/II = 0x88BE, type III = 0x22EB |
84e54fe0 WT |
59 | */ |
60 | ||
d350a823 WT |
61 | #include <uapi/linux/erspan.h> |
62 | ||
1d7e2ed2 | 63 | #define ERSPAN_VERSION 0x1 /* ERSPAN type II */ |
84e54fe0 WT |
64 | #define VER_MASK 0xf000 |
65 | #define VLAN_MASK 0x0fff | |
66 | #define COS_MASK 0xe000 | |
67 | #define EN_MASK 0x1800 | |
68 | #define T_MASK 0x0400 | |
69 | #define ID_MASK 0x03ff | |
70 | #define INDEX_MASK 0xfffff | |
71 | ||
f551c91d WT |
72 | #define ERSPAN_VERSION2 0x2 /* ERSPAN type III*/ |
73 | #define BSO_MASK EN_MASK | |
74 | #define SGT_MASK 0xffff0000 | |
75 | #define P_MASK 0x8000 | |
76 | #define FT_MASK 0x7c00 | |
77 | #define HWID_MASK 0x03f0 | |
78 | #define DIR_MASK 0x0008 | |
79 | #define GRA_MASK 0x0006 | |
80 | #define O_MASK 0x0001 | |
81 | ||
c69de58b WT |
82 | #define HWID_OFFSET 4 |
83 | #define DIR_OFFSET 3 | |
84 | ||
84e54fe0 WT |
85 | enum erspan_encap_type { |
86 | ERSPAN_ENCAP_NOVLAN = 0x0, /* originally without VLAN tag */ | |
87 | ERSPAN_ENCAP_ISL = 0x1, /* originally ISL encapsulated */ | |
88 | ERSPAN_ENCAP_8021Q = 0x2, /* originally 802.1Q encapsulated */ | |
89 | ERSPAN_ENCAP_INFRAME = 0x3, /* VLAN tag perserved in frame */ | |
90 | }; | |
91 | ||
1d7e2ed2 WT |
92 | #define ERSPAN_V1_MDSIZE 4 |
93 | #define ERSPAN_V2_MDSIZE 8 | |
84e54fe0 | 94 | |
1d7e2ed2 | 95 | struct erspan_base_hdr { |
c69de58b WT |
96 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
97 | __u8 vlan_upper:4, | |
98 | ver:4; | |
99 | __u8 vlan:8; | |
100 | __u8 session_id_upper:2, | |
101 | t:1, | |
102 | en:2, | |
103 | cos:3; | |
104 | __u8 session_id:8; | |
105 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
106 | __u8 ver: 4, | |
107 | vlan_upper:4; | |
108 | __u8 vlan:8; | |
109 | __u8 cos:3, | |
110 | en:2, | |
111 | t:1, | |
112 | session_id_upper:2; | |
113 | __u8 session_id:8; | |
114 | #else | |
115 | #error "Please fix <asm/byteorder.h>" | |
116 | #endif | |
84e54fe0 WT |
117 | }; |
118 | ||
c69de58b WT |
119 | static inline void set_session_id(struct erspan_base_hdr *ershdr, u16 id) |
120 | { | |
121 | ershdr->session_id = id & 0xff; | |
122 | ershdr->session_id_upper = (id >> 8) & 0x3; | |
123 | } | |
124 | ||
125 | static inline u16 get_session_id(const struct erspan_base_hdr *ershdr) | |
126 | { | |
127 | return (ershdr->session_id_upper << 8) + ershdr->session_id; | |
128 | } | |
129 | ||
130 | static inline void set_vlan(struct erspan_base_hdr *ershdr, u16 vlan) | |
131 | { | |
132 | ershdr->vlan = vlan & 0xff; | |
133 | ershdr->vlan_upper = (vlan >> 8) & 0xf; | |
134 | } | |
135 | ||
136 | static inline u16 get_vlan(const struct erspan_base_hdr *ershdr) | |
137 | { | |
138 | return (ershdr->vlan_upper << 8) + ershdr->vlan; | |
139 | } | |
140 | ||
141 | static inline void set_hwid(struct erspan_md2 *md2, u8 hwid) | |
142 | { | |
143 | md2->hwid = hwid & 0xf; | |
144 | md2->hwid_upper = (hwid >> 4) & 0x3; | |
145 | } | |
146 | ||
147 | static inline u8 get_hwid(const struct erspan_md2 *md2) | |
148 | { | |
149 | return (md2->hwid_upper << 4) + md2->hwid; | |
150 | } | |
151 | ||
1d7e2ed2 WT |
152 | static inline int erspan_hdr_len(int version) |
153 | { | |
f989d546 WT |
154 | if (version == 0) |
155 | return 0; | |
156 | ||
1d7e2ed2 WT |
157 | return sizeof(struct erspan_base_hdr) + |
158 | (version == 1 ? ERSPAN_V1_MDSIZE : ERSPAN_V2_MDSIZE); | |
159 | } | |
160 | ||
a3222dc9 WT |
161 | static inline u8 tos_to_cos(u8 tos) |
162 | { | |
163 | u8 dscp, cos; | |
164 | ||
165 | dscp = tos >> 2; | |
166 | cos = dscp >> 3; | |
167 | return cos; | |
168 | } | |
169 | ||
170 | static inline void erspan_build_header(struct sk_buff *skb, | |
c69de58b | 171 | u32 id, u32 index, |
a3222dc9 WT |
172 | bool truncate, bool is_ipv4) |
173 | { | |
b423d13c | 174 | struct ethhdr *eth = (struct ethhdr *)skb->data; |
a3222dc9 | 175 | enum erspan_encap_type enc_type; |
1d7e2ed2 | 176 | struct erspan_base_hdr *ershdr; |
a3222dc9 WT |
177 | struct qtag_prefix { |
178 | __be16 eth_type; | |
179 | __be16 tci; | |
180 | } *qp; | |
181 | u16 vlan_tci = 0; | |
182 | u8 tos; | |
3df19283 | 183 | __be32 *idx; |
a3222dc9 WT |
184 | |
185 | tos = is_ipv4 ? ip_hdr(skb)->tos : | |
186 | (ipv6_hdr(skb)->priority << 4) + | |
187 | (ipv6_hdr(skb)->flow_lbl[0] >> 4); | |
188 | ||
189 | enc_type = ERSPAN_ENCAP_NOVLAN; | |
190 | ||
191 | /* If mirrored packet has vlan tag, extract tci and | |
192 | * perserve vlan header in the mirrored frame. | |
193 | */ | |
194 | if (eth->h_proto == htons(ETH_P_8021Q)) { | |
195 | qp = (struct qtag_prefix *)(skb->data + 2 * ETH_ALEN); | |
196 | vlan_tci = ntohs(qp->tci); | |
197 | enc_type = ERSPAN_ENCAP_INFRAME; | |
198 | } | |
199 | ||
1d7e2ed2 WT |
200 | skb_push(skb, sizeof(*ershdr) + ERSPAN_V1_MDSIZE); |
201 | ershdr = (struct erspan_base_hdr *)skb->data; | |
202 | memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V1_MDSIZE); | |
a3222dc9 | 203 | |
1d7e2ed2 | 204 | /* Build base header */ |
c69de58b WT |
205 | ershdr->ver = ERSPAN_VERSION; |
206 | ershdr->cos = tos_to_cos(tos); | |
207 | ershdr->en = enc_type; | |
208 | ershdr->t = truncate; | |
209 | set_vlan(ershdr, vlan_tci); | |
210 | set_session_id(ershdr, id); | |
1d7e2ed2 WT |
211 | |
212 | /* Build metadata */ | |
3df19283 WT |
213 | idx = (__be32 *)(ershdr + 1); |
214 | *idx = htonl(index & INDEX_MASK); | |
a3222dc9 WT |
215 | } |
216 | ||
f551c91d WT |
217 | /* ERSPAN GRA: timestamp granularity |
218 | * 00b --> granularity = 100 microseconds | |
219 | * 01b --> granularity = 100 nanoseconds | |
220 | * 10b --> granularity = IEEE 1588 | |
221 | * Here we only support 100 microseconds. | |
222 | */ | |
223 | static inline __be32 erspan_get_timestamp(void) | |
224 | { | |
225 | u64 h_usecs; | |
226 | ktime_t kt; | |
227 | ||
228 | kt = ktime_get_real(); | |
229 | h_usecs = ktime_divns(kt, 100 * NSEC_PER_USEC); | |
230 | ||
231 | /* ERSPAN base header only has 32-bit, | |
232 | * so it wraps around 4 days. | |
233 | */ | |
234 | return htonl((u32)h_usecs); | |
235 | } | |
236 | ||
d48f1958 WT |
237 | /* ERSPAN BSO (Bad/Short/Oversized), see RFC1757 |
238 | * 00b --> Good frame with no error, or unknown integrity | |
239 | * 01b --> Payload is a Short Frame | |
240 | * 10b --> Payload is an Oversized Frame | |
241 | * 11b --> Payload is a Bad Frame with CRC or Alignment Error | |
242 | */ | |
243 | enum erspan_bso { | |
244 | BSO_NOERROR = 0x0, | |
245 | BSO_SHORT = 0x1, | |
246 | BSO_OVERSIZED = 0x2, | |
247 | BSO_BAD = 0x3, | |
248 | }; | |
249 | ||
250 | static inline u8 erspan_detect_bso(struct sk_buff *skb) | |
251 | { | |
252 | /* BSO_BAD is not handled because the frame CRC | |
253 | * or alignment error information is in FCS. | |
254 | */ | |
255 | if (skb->len < ETH_ZLEN) | |
256 | return BSO_SHORT; | |
257 | ||
258 | if (skb->len > ETH_FRAME_LEN) | |
259 | return BSO_OVERSIZED; | |
260 | ||
261 | return BSO_NOERROR; | |
262 | } | |
263 | ||
f551c91d | 264 | static inline void erspan_build_header_v2(struct sk_buff *skb, |
c69de58b | 265 | u32 id, u8 direction, u16 hwid, |
f551c91d WT |
266 | bool truncate, bool is_ipv4) |
267 | { | |
b423d13c | 268 | struct ethhdr *eth = (struct ethhdr *)skb->data; |
f551c91d | 269 | struct erspan_base_hdr *ershdr; |
3df19283 | 270 | struct erspan_md2 *md2; |
f551c91d WT |
271 | struct qtag_prefix { |
272 | __be16 eth_type; | |
273 | __be16 tci; | |
274 | } *qp; | |
275 | u16 vlan_tci = 0; | |
f551c91d WT |
276 | u8 gra = 0; /* 100 usec */ |
277 | u8 bso = 0; /* Bad/Short/Oversized */ | |
278 | u8 sgt = 0; | |
279 | u8 tos; | |
280 | ||
281 | tos = is_ipv4 ? ip_hdr(skb)->tos : | |
282 | (ipv6_hdr(skb)->priority << 4) + | |
283 | (ipv6_hdr(skb)->flow_lbl[0] >> 4); | |
284 | ||
285 | /* Unlike v1, v2 does not have En field, | |
286 | * so only extract vlan tci field. | |
287 | */ | |
288 | if (eth->h_proto == htons(ETH_P_8021Q)) { | |
289 | qp = (struct qtag_prefix *)(skb->data + 2 * ETH_ALEN); | |
290 | vlan_tci = ntohs(qp->tci); | |
291 | } | |
292 | ||
d48f1958 | 293 | bso = erspan_detect_bso(skb); |
f551c91d WT |
294 | skb_push(skb, sizeof(*ershdr) + ERSPAN_V2_MDSIZE); |
295 | ershdr = (struct erspan_base_hdr *)skb->data; | |
296 | memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V2_MDSIZE); | |
297 | ||
298 | /* Build base header */ | |
c69de58b WT |
299 | ershdr->ver = ERSPAN_VERSION2; |
300 | ershdr->cos = tos_to_cos(tos); | |
301 | ershdr->en = bso; | |
302 | ershdr->t = truncate; | |
303 | set_vlan(ershdr, vlan_tci); | |
304 | set_session_id(ershdr, id); | |
f551c91d WT |
305 | |
306 | /* Build metadata */ | |
3df19283 WT |
307 | md2 = (struct erspan_md2 *)(ershdr + 1); |
308 | md2->timestamp = erspan_get_timestamp(); | |
309 | md2->sgt = htons(sgt); | |
310 | md2->p = 1; | |
311 | md2->ft = 0; | |
312 | md2->dir = direction; | |
313 | md2->gra = gra; | |
314 | md2->o = 0; | |
315 | set_hwid(md2, hwid); | |
f551c91d WT |
316 | } |
317 | ||
84e54fe0 | 318 | #endif |