]>
Commit | Line | Data |
---|---|---|
b9e8b45a | 1 | /* |
48cecbdc | 2 | * Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc. |
b9e8b45a BP |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #include <config.h> | |
18 | #include "packets.h" | |
d31f1109 | 19 | #include <arpa/inet.h> |
6ca00f6f | 20 | #include <sys/socket.h> |
b9e8b45a | 21 | #include <netinet/in.h> |
bc7a5acd | 22 | #include <netinet/ip6.h> |
76343538 | 23 | #include <stdlib.h> |
d31f1109 | 24 | #include "byte-order.h" |
c97664b3 | 25 | #include "csum.h" |
c6bcb685 | 26 | #include "crc32c.h" |
12113c39 | 27 | #include "flow.h" |
7d48a4cc | 28 | #include "hmap.h" |
d31f1109 | 29 | #include "dynamic-string.h" |
b9e8b45a | 30 | #include "ofpbuf.h" |
8c45d00f | 31 | #include "ovs-thread.h" |
b5e7e61a | 32 | #include "odp-util.h" |
7c457c33 | 33 | #include "unaligned.h" |
b9e8b45a | 34 | |
d31f1109 JP |
35 | const struct in6_addr in6addr_exact = IN6ADDR_EXACT_INIT; |
36 | ||
093ca5b3 BP |
37 | /* Parses 's' as a 16-digit hexadecimal number representing a datapath ID. On |
38 | * success stores the dpid into '*dpidp' and returns true, on failure stores 0 | |
39 | * into '*dpidp' and returns false. | |
40 | * | |
41 | * Rejects an all-zeros dpid as invalid. */ | |
76343538 BP |
42 | bool |
43 | dpid_from_string(const char *s, uint64_t *dpidp) | |
44 | { | |
b123cc3c | 45 | *dpidp = (strlen(s) == 16 && strspn(s, "0123456789abcdefABCDEF") == 16 |
093ca5b3 | 46 | ? strtoull(s, NULL, 16) |
76343538 BP |
47 | : 0); |
48 | return *dpidp != 0; | |
49 | } | |
50 | ||
7d48a4cc BP |
51 | /* Returns true if 'ea' is a reserved address, that a bridge must never |
52 | * forward, false otherwise. | |
05be4e2c EJ |
53 | * |
54 | * If you change this function's behavior, please update corresponding | |
55 | * documentation in vswitch.xml at the same time. */ | |
56 | bool | |
57 | eth_addr_is_reserved(const uint8_t ea[ETH_ADDR_LEN]) | |
58 | { | |
7d48a4cc BP |
59 | struct eth_addr_node { |
60 | struct hmap_node hmap_node; | |
8c45d00f | 61 | const uint64_t ea64; |
05be4e2c EJ |
62 | }; |
63 | ||
7d48a4cc BP |
64 | static struct eth_addr_node nodes[] = { |
65 | /* STP, IEEE pause frames, and other reserved protocols. */ | |
f0ac9da9 BP |
66 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000000ULL }, |
67 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000001ULL }, | |
68 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000002ULL }, | |
69 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000003ULL }, | |
70 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000004ULL }, | |
71 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000005ULL }, | |
72 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000006ULL }, | |
73 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000007ULL }, | |
74 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000008ULL }, | |
75 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000009ULL }, | |
76 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000aULL }, | |
77 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000bULL }, | |
78 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000cULL }, | |
79 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000dULL }, | |
80 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000eULL }, | |
81 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000fULL }, | |
7d48a4cc BP |
82 | |
83 | /* Extreme protocols. */ | |
84 | { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000000ULL }, /* EDP. */ | |
85 | { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000004ULL }, /* EAPS. */ | |
86 | { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000006ULL }, /* EAPS. */ | |
87 | ||
88 | /* Cisco protocols. */ | |
89 | { HMAP_NODE_NULL_INITIALIZER, 0x01000c000000ULL }, /* ISL. */ | |
90 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccccULL }, /* PAgP, UDLD, CDP, | |
91 | * DTP, VTP. */ | |
92 | { HMAP_NODE_NULL_INITIALIZER, 0x01000ccccccdULL }, /* PVST+. */ | |
93 | { HMAP_NODE_NULL_INITIALIZER, 0x01000ccdcdcdULL }, /* STP Uplink Fast, | |
94 | * FlexLink. */ | |
95 | ||
96 | /* Cisco CFM. */ | |
97 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc0ULL }, | |
98 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc1ULL }, | |
99 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc2ULL }, | |
100 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc3ULL }, | |
101 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc4ULL }, | |
102 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc5ULL }, | |
103 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc6ULL }, | |
104 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc7ULL }, | |
105 | }; | |
05be4e2c | 106 | |
8c45d00f | 107 | static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER; |
7d48a4cc | 108 | struct eth_addr_node *node; |
8c45d00f | 109 | static struct hmap addrs; |
7d48a4cc | 110 | uint64_t ea64; |
05be4e2c | 111 | |
8c45d00f BP |
112 | if (ovsthread_once_start(&once)) { |
113 | hmap_init(&addrs); | |
7d48a4cc | 114 | for (node = nodes; node < &nodes[ARRAY_SIZE(nodes)]; node++) { |
965607c8 | 115 | hmap_insert(&addrs, &node->hmap_node, hash_uint64(node->ea64)); |
7d48a4cc | 116 | } |
8c45d00f | 117 | ovsthread_once_done(&once); |
7d48a4cc | 118 | } |
05be4e2c | 119 | |
7d48a4cc | 120 | ea64 = eth_addr_to_uint64(ea); |
965607c8 | 121 | HMAP_FOR_EACH_IN_BUCKET (node, hmap_node, hash_uint64(ea64), &addrs) { |
7d48a4cc | 122 | if (node->ea64 == ea64) { |
05be4e2c EJ |
123 | return true; |
124 | } | |
125 | } | |
126 | return false; | |
127 | } | |
128 | ||
76343538 BP |
129 | bool |
130 | eth_addr_from_string(const char *s, uint8_t ea[ETH_ADDR_LEN]) | |
131 | { | |
c2c28dfd | 132 | if (ovs_scan(s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(ea))) { |
76343538 BP |
133 | return true; |
134 | } else { | |
135 | memset(ea, 0, ETH_ADDR_LEN); | |
136 | return false; | |
137 | } | |
138 | } | |
139 | ||
38f7147c | 140 | /* Fills 'b' with a Reverse ARP packet with Ethernet source address 'eth_src'. |
b9e8b45a | 141 | * This function is used by Open vSwitch to compose packets in cases where |
38f7147c EJ |
142 | * context is important but content doesn't (or shouldn't) matter. |
143 | * | |
144 | * The returned packet has enough headroom to insert an 802.1Q VLAN header if | |
145 | * desired. */ | |
b9e8b45a | 146 | void |
2ea838ac | 147 | compose_rarp(struct ofpbuf *b, const uint8_t eth_src[ETH_ADDR_LEN]) |
b9e8b45a | 148 | { |
38f7147c | 149 | struct eth_header *eth; |
7cb57d10 | 150 | struct arp_eth_header *arp; |
b9e8b45a | 151 | |
38f7147c | 152 | ofpbuf_clear(b); |
bb622f82 | 153 | ofpbuf_prealloc_tailroom(b, 2 + ETH_HEADER_LEN + VLAN_HEADER_LEN |
7cb57d10 | 154 | + ARP_ETH_HEADER_LEN); |
bb622f82 | 155 | ofpbuf_reserve(b, 2 + VLAN_HEADER_LEN); |
38f7147c EJ |
156 | eth = ofpbuf_put_uninit(b, sizeof *eth); |
157 | memcpy(eth->eth_dst, eth_addr_broadcast, ETH_ADDR_LEN); | |
158 | memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN); | |
159 | eth->eth_type = htons(ETH_TYPE_RARP); | |
160 | ||
7cb57d10 EJ |
161 | arp = ofpbuf_put_uninit(b, sizeof *arp); |
162 | arp->ar_hrd = htons(ARP_HRD_ETHERNET); | |
163 | arp->ar_pro = htons(ARP_PRO_IP); | |
164 | arp->ar_hln = sizeof arp->ar_sha; | |
165 | arp->ar_pln = sizeof arp->ar_spa; | |
166 | arp->ar_op = htons(ARP_OP_RARP); | |
167 | memcpy(arp->ar_sha, eth_src, ETH_ADDR_LEN); | |
7c457c33 | 168 | put_16aligned_be32(&arp->ar_spa, htonl(0)); |
7cb57d10 | 169 | memcpy(arp->ar_tha, eth_src, ETH_ADDR_LEN); |
7c457c33 | 170 | put_16aligned_be32(&arp->ar_tpa, htonl(0)); |
b9e8b45a | 171 | } |
d31f1109 | 172 | |
d9065a90 | 173 | /* Insert VLAN header according to given TCI. Packet passed must be Ethernet |
2f4ca41b | 174 | * packet. Ignores the CFI bit of 'tci' using 0 instead. |
7c66b273 BP |
175 | * |
176 | * Also sets 'packet->l2' to point to the new Ethernet header. */ | |
177 | void | |
1bf02876 | 178 | eth_push_vlan(struct ofpbuf *packet, ovs_be16 tpid, ovs_be16 tci) |
7c66b273 BP |
179 | { |
180 | struct eth_header *eh = packet->data; | |
181 | struct vlan_eth_header *veh; | |
182 | ||
d9065a90 PS |
183 | /* Insert new 802.1Q header. */ |
184 | struct vlan_eth_header tmp; | |
185 | memcpy(tmp.veth_dst, eh->eth_dst, ETH_ADDR_LEN); | |
186 | memcpy(tmp.veth_src, eh->eth_src, ETH_ADDR_LEN); | |
1bf02876 | 187 | tmp.veth_type = tpid; |
2f4ca41b | 188 | tmp.veth_tci = tci & htons(~VLAN_CFI); |
d9065a90 PS |
189 | tmp.veth_next_type = eh->eth_type; |
190 | ||
191 | veh = ofpbuf_push_uninit(packet, VLAN_HEADER_LEN); | |
192 | memcpy(veh, &tmp, sizeof tmp); | |
7c66b273 | 193 | |
7c66b273 BP |
194 | packet->l2 = packet->data; |
195 | } | |
196 | ||
f4ebc25e BP |
197 | /* Removes outermost VLAN header (if any is present) from 'packet'. |
198 | * | |
b02475c5 SH |
199 | * 'packet->l2_5' should initially point to 'packet''s outer-most MPLS header |
200 | * or may be NULL if there are no MPLS headers. */ | |
f4ebc25e BP |
201 | void |
202 | eth_pop_vlan(struct ofpbuf *packet) | |
203 | { | |
204 | struct vlan_eth_header *veh = packet->l2; | |
205 | if (packet->size >= sizeof *veh | |
206 | && veh->veth_type == htons(ETH_TYPE_VLAN)) { | |
207 | struct eth_header tmp; | |
208 | ||
209 | memcpy(tmp.eth_dst, veh->veth_dst, ETH_ADDR_LEN); | |
210 | memcpy(tmp.eth_src, veh->veth_src, ETH_ADDR_LEN); | |
211 | tmp.eth_type = veh->veth_next_type; | |
212 | ||
213 | ofpbuf_pull(packet, VLAN_HEADER_LEN); | |
214 | packet->l2 = (char*)packet->l2 + VLAN_HEADER_LEN; | |
215 | memcpy(packet->data, &tmp, sizeof tmp); | |
216 | } | |
217 | } | |
218 | ||
b02475c5 | 219 | /* Set ethertype of the packet. */ |
56b02633 | 220 | static void |
b02475c5 SH |
221 | set_ethertype(struct ofpbuf *packet, ovs_be16 eth_type) |
222 | { | |
223 | struct eth_header *eh = packet->data; | |
224 | ||
225 | if (eh->eth_type == htons(ETH_TYPE_VLAN)) { | |
226 | ovs_be16 *p; | |
db5a1019 AW |
227 | p = ALIGNED_CAST(ovs_be16 *, |
228 | (char *)(packet->l2_5 ? packet->l2_5 : packet->l3) - 2); | |
b02475c5 SH |
229 | *p = eth_type; |
230 | } else { | |
231 | eh->eth_type = eth_type; | |
232 | } | |
233 | } | |
234 | ||
235 | static bool is_mpls(struct ofpbuf *packet) | |
236 | { | |
237 | return packet->l2_5 != NULL; | |
238 | } | |
239 | ||
240 | /* Set time to live (TTL) of an MPLS label stack entry (LSE). */ | |
b676167a | 241 | void |
b02475c5 SH |
242 | set_mpls_lse_ttl(ovs_be32 *lse, uint8_t ttl) |
243 | { | |
244 | *lse &= ~htonl(MPLS_TTL_MASK); | |
245 | *lse |= htonl((ttl << MPLS_TTL_SHIFT) & MPLS_TTL_MASK); | |
246 | } | |
247 | ||
248 | /* Set traffic class (TC) of an MPLS label stack entry (LSE). */ | |
249 | void | |
250 | set_mpls_lse_tc(ovs_be32 *lse, uint8_t tc) | |
251 | { | |
252 | *lse &= ~htonl(MPLS_TC_MASK); | |
253 | *lse |= htonl((tc << MPLS_TC_SHIFT) & MPLS_TC_MASK); | |
254 | } | |
255 | ||
256 | /* Set label of an MPLS label stack entry (LSE). */ | |
257 | void | |
258 | set_mpls_lse_label(ovs_be32 *lse, ovs_be32 label) | |
259 | { | |
260 | *lse &= ~htonl(MPLS_LABEL_MASK); | |
261 | *lse |= htonl((ntohl(label) << MPLS_LABEL_SHIFT) & MPLS_LABEL_MASK); | |
262 | } | |
263 | ||
264 | /* Set bottom of stack (BoS) bit of an MPLS label stack entry (LSE). */ | |
265 | void | |
266 | set_mpls_lse_bos(ovs_be32 *lse, uint8_t bos) | |
267 | { | |
268 | *lse &= ~htonl(MPLS_BOS_MASK); | |
269 | *lse |= htonl((bos << MPLS_BOS_SHIFT) & MPLS_BOS_MASK); | |
270 | } | |
271 | ||
272 | /* Compose an MPLS label stack entry (LSE) from its components: | |
273 | * label, traffic class (TC), time to live (TTL) and | |
274 | * bottom of stack (BoS) bit. */ | |
275 | ovs_be32 | |
276 | set_mpls_lse_values(uint8_t ttl, uint8_t tc, uint8_t bos, ovs_be32 label) | |
277 | { | |
278 | ovs_be32 lse = htonl(0); | |
279 | set_mpls_lse_ttl(&lse, ttl); | |
280 | set_mpls_lse_tc(&lse, tc); | |
281 | set_mpls_lse_bos(&lse, bos); | |
282 | set_mpls_lse_label(&lse, label); | |
283 | return lse; | |
284 | } | |
285 | ||
286 | /* Push an new MPLS stack entry onto the MPLS stack and adjust 'packet->l2' and | |
287 | * 'packet->l2_5' accordingly. The new entry will be the outermost entry on | |
288 | * the stack. | |
289 | * | |
290 | * Previous to calling this function, 'packet->l2_5' must be set; if the MPLS | |
291 | * label to be pushed will be the first label in 'packet', then it should be | |
292 | * the same as 'packet->l3'. */ | |
293 | static void | |
294 | push_mpls_lse(struct ofpbuf *packet, struct mpls_hdr *mh) | |
295 | { | |
296 | char * header; | |
297 | size_t len; | |
298 | header = ofpbuf_push_uninit(packet, MPLS_HLEN); | |
299 | len = (char *)packet->l2_5 - (char *)packet->l2; | |
300 | memmove(header, packet->l2, len); | |
301 | memcpy(header + len, mh, sizeof *mh); | |
302 | packet->l2 = (char*)packet->l2 - MPLS_HLEN; | |
303 | packet->l2_5 = (char*)packet->l2_5 - MPLS_HLEN; | |
304 | } | |
305 | ||
306 | /* Set MPLS label stack entry to outermost MPLS header.*/ | |
307 | void | |
308 | set_mpls_lse(struct ofpbuf *packet, ovs_be32 mpls_lse) | |
309 | { | |
310 | struct mpls_hdr *mh = packet->l2_5; | |
311 | ||
312 | /* Packet type should be MPLS to set label stack entry. */ | |
313 | if (is_mpls(packet)) { | |
314 | /* Update mpls label stack entry. */ | |
315 | mh->mpls_lse = mpls_lse; | |
316 | } | |
317 | } | |
318 | ||
319 | /* Push MPLS label stack entry 'lse' onto 'packet' as the the outermost MPLS | |
320 | * header. If 'packet' does not already have any MPLS labels, then its | |
321 | * Ethertype is changed to 'ethtype' (which must be an MPLS Ethertype). */ | |
322 | void | |
323 | push_mpls(struct ofpbuf *packet, ovs_be16 ethtype, ovs_be32 lse) | |
324 | { | |
325 | struct mpls_hdr mh; | |
326 | ||
327 | if (!eth_type_mpls(ethtype)) { | |
328 | return; | |
329 | } | |
330 | ||
0c1625e8 SH |
331 | set_ethertype(packet, ethtype); |
332 | ||
b02475c5 | 333 | if (!is_mpls(packet)) { |
0c1625e8 | 334 | /* Set MPLS label stack entry. */ |
b02475c5 SH |
335 | packet->l2_5 = packet->l3; |
336 | } | |
337 | ||
338 | /* Push new MPLS shim header onto packet. */ | |
339 | mh.mpls_lse = lse; | |
340 | push_mpls_lse(packet, &mh); | |
341 | } | |
342 | ||
343 | /* If 'packet' is an MPLS packet, removes its outermost MPLS label stack entry. | |
344 | * If the label that was removed was the only MPLS label, changes 'packet''s | |
345 | * Ethertype to 'ethtype' (which ordinarily should not be an MPLS | |
346 | * Ethertype). */ | |
347 | void | |
348 | pop_mpls(struct ofpbuf *packet, ovs_be16 ethtype) | |
349 | { | |
350 | struct mpls_hdr *mh = NULL; | |
351 | ||
352 | if (is_mpls(packet)) { | |
353 | size_t len; | |
354 | mh = packet->l2_5; | |
355 | len = (char*)packet->l2_5 - (char*)packet->l2; | |
799a91bb | 356 | set_ethertype(packet, ethtype); |
b02475c5 | 357 | if (mh->mpls_lse & htonl(MPLS_BOS_MASK)) { |
2555b1db | 358 | packet->l2_5 = NULL; |
b02475c5 SH |
359 | } else { |
360 | packet->l2_5 = (char*)packet->l2_5 + MPLS_HLEN; | |
361 | } | |
362 | /* Shift the l2 header forward. */ | |
363 | memmove((char*)packet->data + MPLS_HLEN, packet->data, len); | |
364 | packet->size -= MPLS_HLEN; | |
365 | packet->data = (char*)packet->data + MPLS_HLEN; | |
366 | packet->l2 = (char*)packet->l2 + MPLS_HLEN; | |
367 | } | |
368 | } | |
369 | ||
e22f1753 BP |
370 | /* Converts hex digits in 'hex' to an Ethernet packet in '*packetp'. The |
371 | * caller must free '*packetp'. On success, returns NULL. On failure, returns | |
bb622f82 BP |
372 | * an error message and stores NULL in '*packetp'. |
373 | * | |
374 | * Aligns the L3 header of '*packetp' on a 32-bit boundary. */ | |
e22f1753 BP |
375 | const char * |
376 | eth_from_hex(const char *hex, struct ofpbuf **packetp) | |
377 | { | |
378 | struct ofpbuf *packet; | |
379 | ||
bb622f82 BP |
380 | /* Use 2 bytes of headroom to 32-bit align the L3 header. */ |
381 | packet = *packetp = ofpbuf_new_with_headroom(strlen(hex) / 2, 2); | |
e22f1753 BP |
382 | |
383 | if (ofpbuf_put_hex(packet, hex, NULL)[0] != '\0') { | |
384 | ofpbuf_delete(packet); | |
385 | *packetp = NULL; | |
386 | return "Trailing garbage in packet data"; | |
387 | } | |
388 | ||
389 | if (packet->size < ETH_HEADER_LEN) { | |
390 | ofpbuf_delete(packet); | |
391 | *packetp = NULL; | |
392 | return "Packet data too short for Ethernet"; | |
393 | } | |
394 | ||
395 | return NULL; | |
396 | } | |
397 | ||
3b4d8ad3 JS |
398 | void |
399 | eth_format_masked(const uint8_t eth[ETH_ADDR_LEN], | |
400 | const uint8_t mask[ETH_ADDR_LEN], struct ds *s) | |
401 | { | |
402 | ds_put_format(s, ETH_ADDR_FMT, ETH_ADDR_ARGS(eth)); | |
73c0ce34 | 403 | if (mask && !eth_mask_is_exact(mask)) { |
3b4d8ad3 JS |
404 | ds_put_format(s, "/"ETH_ADDR_FMT, ETH_ADDR_ARGS(mask)); |
405 | } | |
406 | } | |
407 | ||
408 | void | |
409 | eth_addr_bitand(const uint8_t src[ETH_ADDR_LEN], | |
410 | const uint8_t mask[ETH_ADDR_LEN], | |
411 | uint8_t dst[ETH_ADDR_LEN]) | |
412 | { | |
413 | int i; | |
414 | ||
415 | for (i = 0; i < ETH_ADDR_LEN; i++) { | |
416 | dst[i] = src[i] & mask[i]; | |
417 | } | |
418 | } | |
419 | ||
aad29cd1 | 420 | /* Given the IP netmask 'netmask', returns the number of bits of the IP address |
c08201d6 BP |
421 | * that it specifies, that is, the number of 1-bits in 'netmask'. |
422 | * | |
423 | * If 'netmask' is not a CIDR netmask (see ip_is_cidr()), the return value will | |
424 | * still be in the valid range but isn't otherwise meaningful. */ | |
aad29cd1 BP |
425 | int |
426 | ip_count_cidr_bits(ovs_be32 netmask) | |
427 | { | |
d578065e | 428 | return 32 - ctz32(ntohl(netmask)); |
aad29cd1 BP |
429 | } |
430 | ||
431 | void | |
432 | ip_format_masked(ovs_be32 ip, ovs_be32 mask, struct ds *s) | |
433 | { | |
ed36537e | 434 | ds_put_format(s, IP_FMT, IP_ARGS(ip)); |
b8266395 | 435 | if (mask != OVS_BE32_MAX) { |
aad29cd1 BP |
436 | if (ip_is_cidr(mask)) { |
437 | ds_put_format(s, "/%d", ip_count_cidr_bits(mask)); | |
438 | } else { | |
ed36537e | 439 | ds_put_format(s, "/"IP_FMT, IP_ARGS(mask)); |
aad29cd1 BP |
440 | } |
441 | } | |
442 | } | |
443 | ||
444 | ||
d31f1109 JP |
445 | /* Stores the string representation of the IPv6 address 'addr' into the |
446 | * character array 'addr_str', which must be at least INET6_ADDRSTRLEN | |
447 | * bytes long. */ | |
448 | void | |
449 | format_ipv6_addr(char *addr_str, const struct in6_addr *addr) | |
450 | { | |
451 | inet_ntop(AF_INET6, addr, addr_str, INET6_ADDRSTRLEN); | |
452 | } | |
453 | ||
454 | void | |
455 | print_ipv6_addr(struct ds *string, const struct in6_addr *addr) | |
456 | { | |
aad29cd1 BP |
457 | char *dst; |
458 | ||
459 | ds_reserve(string, string->length + INET6_ADDRSTRLEN); | |
460 | ||
461 | dst = string->string + string->length; | |
462 | format_ipv6_addr(dst, addr); | |
463 | string->length += strlen(dst); | |
464 | } | |
d31f1109 | 465 | |
aad29cd1 BP |
466 | void |
467 | print_ipv6_masked(struct ds *s, const struct in6_addr *addr, | |
468 | const struct in6_addr *mask) | |
469 | { | |
470 | print_ipv6_addr(s, addr); | |
471 | if (mask && !ipv6_mask_is_exact(mask)) { | |
472 | if (ipv6_is_cidr(mask)) { | |
473 | int cidr_bits = ipv6_count_cidr_bits(mask); | |
474 | ds_put_format(s, "/%d", cidr_bits); | |
475 | } else { | |
476 | ds_put_char(s, '/'); | |
477 | print_ipv6_addr(s, mask); | |
478 | } | |
479 | } | |
d31f1109 JP |
480 | } |
481 | ||
482 | struct in6_addr ipv6_addr_bitand(const struct in6_addr *a, | |
483 | const struct in6_addr *b) | |
484 | { | |
485 | int i; | |
486 | struct in6_addr dst; | |
487 | ||
488 | #ifdef s6_addr32 | |
489 | for (i=0; i<4; i++) { | |
490 | dst.s6_addr32[i] = a->s6_addr32[i] & b->s6_addr32[i]; | |
491 | } | |
492 | #else | |
493 | for (i=0; i<16; i++) { | |
494 | dst.s6_addr[i] = a->s6_addr[i] & b->s6_addr[i]; | |
495 | } | |
496 | #endif | |
497 | ||
498 | return dst; | |
499 | } | |
500 | ||
501 | /* Returns an in6_addr consisting of 'mask' high-order 1-bits and 128-N | |
502 | * low-order 0-bits. */ | |
503 | struct in6_addr | |
504 | ipv6_create_mask(int mask) | |
505 | { | |
506 | struct in6_addr netmask; | |
507 | uint8_t *netmaskp = &netmask.s6_addr[0]; | |
508 | ||
509 | memset(&netmask, 0, sizeof netmask); | |
510 | while (mask > 8) { | |
511 | *netmaskp = 0xff; | |
512 | netmaskp++; | |
513 | mask -= 8; | |
514 | } | |
515 | ||
516 | if (mask) { | |
517 | *netmaskp = 0xff << (8 - mask); | |
518 | } | |
519 | ||
520 | return netmask; | |
521 | } | |
522 | ||
aad29cd1 BP |
523 | /* Given the IPv6 netmask 'netmask', returns the number of bits of the IPv6 |
524 | * address that it specifies, that is, the number of 1-bits in 'netmask'. | |
ff0b06ee BP |
525 | * 'netmask' must be a CIDR netmask (see ipv6_is_cidr()). |
526 | * | |
527 | * If 'netmask' is not a CIDR netmask (see ipv6_is_cidr()), the return value | |
528 | * will still be in the valid range but isn't otherwise meaningful. */ | |
d31f1109 JP |
529 | int |
530 | ipv6_count_cidr_bits(const struct in6_addr *netmask) | |
531 | { | |
532 | int i; | |
533 | int count = 0; | |
534 | const uint8_t *netmaskp = &netmask->s6_addr[0]; | |
535 | ||
d31f1109 JP |
536 | for (i=0; i<16; i++) { |
537 | if (netmaskp[i] == 0xff) { | |
538 | count += 8; | |
539 | } else { | |
540 | uint8_t nm; | |
541 | ||
542 | for(nm = netmaskp[i]; nm; nm <<= 1) { | |
543 | count++; | |
544 | } | |
545 | break; | |
546 | } | |
547 | ||
548 | } | |
549 | ||
550 | return count; | |
551 | } | |
552 | ||
d31f1109 JP |
553 | /* Returns true if 'netmask' is a CIDR netmask, that is, if it consists of N |
554 | * high-order 1-bits and 128-N low-order 0-bits. */ | |
555 | bool | |
556 | ipv6_is_cidr(const struct in6_addr *netmask) | |
557 | { | |
558 | const uint8_t *netmaskp = &netmask->s6_addr[0]; | |
559 | int i; | |
560 | ||
561 | for (i=0; i<16; i++) { | |
562 | if (netmaskp[i] != 0xff) { | |
563 | uint8_t x = ~netmaskp[i]; | |
564 | if (x & (x + 1)) { | |
565 | return false; | |
566 | } | |
567 | while (++i < 16) { | |
568 | if (netmaskp[i]) { | |
569 | return false; | |
570 | } | |
571 | } | |
572 | } | |
573 | } | |
574 | ||
575 | return true; | |
576 | } | |
c25c91fd | 577 | |
5de1bb5c BP |
578 | /* Populates 'b' with an Ethernet II packet headed with the given 'eth_dst', |
579 | * 'eth_src' and 'eth_type' parameters. A payload of 'size' bytes is allocated | |
580 | * in 'b' and returned. This payload may be populated with appropriate | |
75a4ead1 | 581 | * information by the caller. Sets 'b''s 'l2' and 'l3' pointers to the |
bb622f82 BP |
582 | * Ethernet header and payload respectively. Aligns b->l3 on a 32-bit |
583 | * boundary. | |
eda1f38d BP |
584 | * |
585 | * The returned packet has enough headroom to insert an 802.1Q VLAN header if | |
586 | * desired. */ | |
40f78b38 | 587 | void * |
5de1bb5c BP |
588 | eth_compose(struct ofpbuf *b, const uint8_t eth_dst[ETH_ADDR_LEN], |
589 | const uint8_t eth_src[ETH_ADDR_LEN], uint16_t eth_type, | |
590 | size_t size) | |
c25c91fd | 591 | { |
40f78b38 | 592 | void *data; |
c25c91fd | 593 | struct eth_header *eth; |
c25c91fd EJ |
594 | |
595 | ofpbuf_clear(b); | |
596 | ||
bb622f82 BP |
597 | /* The magic 2 here ensures that the L3 header (when it is added later) |
598 | * will be 32-bit aligned. */ | |
599 | ofpbuf_prealloc_tailroom(b, 2 + ETH_HEADER_LEN + VLAN_HEADER_LEN + size); | |
600 | ofpbuf_reserve(b, 2 + VLAN_HEADER_LEN); | |
40f78b38 EJ |
601 | eth = ofpbuf_put_uninit(b, ETH_HEADER_LEN); |
602 | data = ofpbuf_put_uninit(b, size); | |
c25c91fd | 603 | |
40f78b38 | 604 | memcpy(eth->eth_dst, eth_dst, ETH_ADDR_LEN); |
c25c91fd | 605 | memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN); |
40f78b38 EJ |
606 | eth->eth_type = htons(eth_type); |
607 | ||
75a4ead1 EJ |
608 | b->l2 = eth; |
609 | b->l3 = data; | |
610 | ||
40f78b38 | 611 | return data; |
07a6cf77 EJ |
612 | } |
613 | ||
c97664b3 | 614 | static void |
7c457c33 BP |
615 | packet_set_ipv4_addr(struct ofpbuf *packet, |
616 | ovs_16aligned_be32 *addr, ovs_be32 new_addr) | |
c97664b3 EJ |
617 | { |
618 | struct ip_header *nh = packet->l3; | |
7c457c33 | 619 | ovs_be32 old_addr = get_16aligned_be32(addr); |
5a51b2cd | 620 | size_t l4_size = ofpbuf_get_l4_size(packet); |
c97664b3 | 621 | |
5a51b2cd | 622 | if (nh->ip_proto == IPPROTO_TCP && l4_size >= TCP_HEADER_LEN) { |
c97664b3 EJ |
623 | struct tcp_header *th = packet->l4; |
624 | ||
7c457c33 | 625 | th->tcp_csum = recalc_csum32(th->tcp_csum, old_addr, new_addr); |
5a51b2cd | 626 | } else if (nh->ip_proto == IPPROTO_UDP && l4_size >= UDP_HEADER_LEN ) { |
c97664b3 EJ |
627 | struct udp_header *uh = packet->l4; |
628 | ||
629 | if (uh->udp_csum) { | |
7c457c33 | 630 | uh->udp_csum = recalc_csum32(uh->udp_csum, old_addr, new_addr); |
c97664b3 EJ |
631 | if (!uh->udp_csum) { |
632 | uh->udp_csum = htons(0xffff); | |
633 | } | |
634 | } | |
635 | } | |
7c457c33 BP |
636 | nh->ip_csum = recalc_csum32(nh->ip_csum, old_addr, new_addr); |
637 | put_16aligned_be32(addr, new_addr); | |
c97664b3 EJ |
638 | } |
639 | ||
bc7a5acd AA |
640 | /* Returns true, if packet contains at least one routing header where |
641 | * segements_left > 0. | |
642 | * | |
643 | * This function assumes that L3 and L4 markers are set in the packet. */ | |
644 | static bool | |
645 | packet_rh_present(struct ofpbuf *packet) | |
646 | { | |
4528f34f | 647 | const struct ovs_16aligned_ip6_hdr *nh; |
bc7a5acd AA |
648 | int nexthdr; |
649 | size_t len; | |
650 | size_t remaining; | |
651 | uint8_t *data = packet->l3; | |
652 | ||
653 | remaining = (uint8_t *)packet->l4 - (uint8_t *)packet->l3; | |
654 | ||
655 | if (remaining < sizeof *nh) { | |
656 | return false; | |
657 | } | |
4528f34f | 658 | nh = ALIGNED_CAST(struct ovs_16aligned_ip6_hdr *, data); |
bc7a5acd AA |
659 | data += sizeof *nh; |
660 | remaining -= sizeof *nh; | |
661 | nexthdr = nh->ip6_nxt; | |
662 | ||
663 | while (1) { | |
664 | if ((nexthdr != IPPROTO_HOPOPTS) | |
665 | && (nexthdr != IPPROTO_ROUTING) | |
666 | && (nexthdr != IPPROTO_DSTOPTS) | |
667 | && (nexthdr != IPPROTO_AH) | |
668 | && (nexthdr != IPPROTO_FRAGMENT)) { | |
669 | /* It's either a terminal header (e.g., TCP, UDP) or one we | |
670 | * don't understand. In either case, we're done with the | |
671 | * packet, so use it to fill in 'nw_proto'. */ | |
672 | break; | |
673 | } | |
674 | ||
675 | /* We only verify that at least 8 bytes of the next header are | |
676 | * available, but many of these headers are longer. Ensure that | |
677 | * accesses within the extension header are within those first 8 | |
678 | * bytes. All extension headers are required to be at least 8 | |
679 | * bytes. */ | |
680 | if (remaining < 8) { | |
681 | return false; | |
682 | } | |
683 | ||
684 | if (nexthdr == IPPROTO_AH) { | |
685 | /* A standard AH definition isn't available, but the fields | |
686 | * we care about are in the same location as the generic | |
687 | * option header--only the header length is calculated | |
688 | * differently. */ | |
689 | const struct ip6_ext *ext_hdr = (struct ip6_ext *)data; | |
690 | ||
691 | nexthdr = ext_hdr->ip6e_nxt; | |
692 | len = (ext_hdr->ip6e_len + 2) * 4; | |
693 | } else if (nexthdr == IPPROTO_FRAGMENT) { | |
4528f34f BP |
694 | const struct ovs_16aligned_ip6_frag *frag_hdr |
695 | = ALIGNED_CAST(struct ovs_16aligned_ip6_frag *, data); | |
bc7a5acd AA |
696 | |
697 | nexthdr = frag_hdr->ip6f_nxt; | |
698 | len = sizeof *frag_hdr; | |
699 | } else if (nexthdr == IPPROTO_ROUTING) { | |
700 | const struct ip6_rthdr *rh = (struct ip6_rthdr *)data; | |
701 | ||
702 | if (rh->ip6r_segleft > 0) { | |
703 | return true; | |
704 | } | |
705 | ||
706 | nexthdr = rh->ip6r_nxt; | |
707 | len = (rh->ip6r_len + 1) * 8; | |
708 | } else { | |
709 | const struct ip6_ext *ext_hdr = (struct ip6_ext *)data; | |
710 | ||
711 | nexthdr = ext_hdr->ip6e_nxt; | |
712 | len = (ext_hdr->ip6e_len + 1) * 8; | |
713 | } | |
714 | ||
715 | if (remaining < len) { | |
716 | return false; | |
717 | } | |
718 | remaining -= len; | |
719 | data += len; | |
720 | } | |
721 | ||
722 | return false; | |
723 | } | |
724 | ||
725 | static void | |
726 | packet_update_csum128(struct ofpbuf *packet, uint8_t proto, | |
4528f34f | 727 | ovs_16aligned_be32 addr[4], const ovs_be32 new_addr[4]) |
bc7a5acd | 728 | { |
5a51b2cd JR |
729 | size_t l4_size = ofpbuf_get_l4_size(packet); |
730 | ||
731 | if (proto == IPPROTO_TCP && l4_size >= TCP_HEADER_LEN) { | |
bc7a5acd AA |
732 | struct tcp_header *th = packet->l4; |
733 | ||
734 | th->tcp_csum = recalc_csum128(th->tcp_csum, addr, new_addr); | |
5a51b2cd | 735 | } else if (proto == IPPROTO_UDP && l4_size >= UDP_HEADER_LEN) { |
bc7a5acd AA |
736 | struct udp_header *uh = packet->l4; |
737 | ||
738 | if (uh->udp_csum) { | |
739 | uh->udp_csum = recalc_csum128(uh->udp_csum, addr, new_addr); | |
740 | if (!uh->udp_csum) { | |
741 | uh->udp_csum = htons(0xffff); | |
742 | } | |
743 | } | |
744 | } | |
745 | } | |
746 | ||
747 | static void | |
748 | packet_set_ipv6_addr(struct ofpbuf *packet, uint8_t proto, | |
4068403a | 749 | ovs_16aligned_be32 addr[4], const ovs_be32 new_addr[4], |
bc7a5acd AA |
750 | bool recalculate_csum) |
751 | { | |
752 | if (recalculate_csum) { | |
4528f34f | 753 | packet_update_csum128(packet, proto, addr, new_addr); |
bc7a5acd | 754 | } |
4068403a | 755 | memcpy(addr, new_addr, sizeof(ovs_be32[4])); |
bc7a5acd AA |
756 | } |
757 | ||
758 | static void | |
4528f34f | 759 | packet_set_ipv6_flow_label(ovs_16aligned_be32 *flow_label, ovs_be32 flow_key) |
bc7a5acd | 760 | { |
4528f34f BP |
761 | ovs_be32 old_label = get_16aligned_be32(flow_label); |
762 | ovs_be32 new_label = (old_label & htonl(~IPV6_LABEL_MASK)) | flow_key; | |
763 | put_16aligned_be32(flow_label, new_label); | |
bc7a5acd AA |
764 | } |
765 | ||
766 | static void | |
4528f34f | 767 | packet_set_ipv6_tc(ovs_16aligned_be32 *flow_label, uint8_t tc) |
bc7a5acd | 768 | { |
4528f34f BP |
769 | ovs_be32 old_label = get_16aligned_be32(flow_label); |
770 | ovs_be32 new_label = (old_label & htonl(0xF00FFFFF)) | htonl(tc << 20); | |
771 | put_16aligned_be32(flow_label, new_label); | |
bc7a5acd AA |
772 | } |
773 | ||
c97664b3 EJ |
774 | /* Modifies the IPv4 header fields of 'packet' to be consistent with 'src', |
775 | * 'dst', 'tos', and 'ttl'. Updates 'packet''s L4 checksums as appropriate. | |
776 | * 'packet' must contain a valid IPv4 packet with correctly populated l[347] | |
777 | * markers. */ | |
778 | void | |
779 | packet_set_ipv4(struct ofpbuf *packet, ovs_be32 src, ovs_be32 dst, | |
780 | uint8_t tos, uint8_t ttl) | |
781 | { | |
782 | struct ip_header *nh = packet->l3; | |
783 | ||
7c457c33 | 784 | if (get_16aligned_be32(&nh->ip_src) != src) { |
c97664b3 EJ |
785 | packet_set_ipv4_addr(packet, &nh->ip_src, src); |
786 | } | |
787 | ||
7c457c33 | 788 | if (get_16aligned_be32(&nh->ip_dst) != dst) { |
c97664b3 EJ |
789 | packet_set_ipv4_addr(packet, &nh->ip_dst, dst); |
790 | } | |
791 | ||
792 | if (nh->ip_tos != tos) { | |
793 | uint8_t *field = &nh->ip_tos; | |
794 | ||
795 | nh->ip_csum = recalc_csum16(nh->ip_csum, htons((uint16_t) *field), | |
796 | htons((uint16_t) tos)); | |
797 | *field = tos; | |
798 | } | |
799 | ||
800 | if (nh->ip_ttl != ttl) { | |
801 | uint8_t *field = &nh->ip_ttl; | |
802 | ||
803 | nh->ip_csum = recalc_csum16(nh->ip_csum, htons(*field << 8), | |
804 | htons(ttl << 8)); | |
805 | *field = ttl; | |
806 | } | |
807 | } | |
808 | ||
bc7a5acd AA |
809 | /* Modifies the IPv6 header fields of 'packet' to be consistent with 'src', |
810 | * 'dst', 'traffic class', and 'next hop'. Updates 'packet''s L4 checksums as | |
811 | * appropriate. 'packet' must contain a valid IPv6 packet with correctly | |
812 | * populated l[347] markers. */ | |
813 | void | |
814 | packet_set_ipv6(struct ofpbuf *packet, uint8_t proto, const ovs_be32 src[4], | |
815 | const ovs_be32 dst[4], uint8_t key_tc, ovs_be32 key_fl, | |
816 | uint8_t key_hl) | |
817 | { | |
4528f34f | 818 | struct ovs_16aligned_ip6_hdr *nh = packet->l3; |
bc7a5acd AA |
819 | |
820 | if (memcmp(&nh->ip6_src, src, sizeof(ovs_be32[4]))) { | |
4528f34f | 821 | packet_set_ipv6_addr(packet, proto, nh->ip6_src.be32, src, true); |
bc7a5acd AA |
822 | } |
823 | ||
824 | if (memcmp(&nh->ip6_dst, dst, sizeof(ovs_be32[4]))) { | |
4528f34f | 825 | packet_set_ipv6_addr(packet, proto, nh->ip6_dst.be32, dst, |
bc7a5acd AA |
826 | !packet_rh_present(packet)); |
827 | } | |
828 | ||
829 | packet_set_ipv6_tc(&nh->ip6_flow, key_tc); | |
830 | ||
831 | packet_set_ipv6_flow_label(&nh->ip6_flow, key_fl); | |
832 | ||
833 | nh->ip6_hlim = key_hl; | |
834 | } | |
835 | ||
c97664b3 EJ |
836 | static void |
837 | packet_set_port(ovs_be16 *port, ovs_be16 new_port, ovs_be16 *csum) | |
838 | { | |
839 | if (*port != new_port) { | |
840 | *csum = recalc_csum16(*csum, *port, new_port); | |
841 | *port = new_port; | |
842 | } | |
843 | } | |
844 | ||
845 | /* Sets the TCP source and destination port ('src' and 'dst' respectively) of | |
846 | * the TCP header contained in 'packet'. 'packet' must be a valid TCP packet | |
847 | * with its l4 marker properly populated. */ | |
848 | void | |
849 | packet_set_tcp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst) | |
850 | { | |
851 | struct tcp_header *th = packet->l4; | |
852 | ||
853 | packet_set_port(&th->tcp_src, src, &th->tcp_csum); | |
854 | packet_set_port(&th->tcp_dst, dst, &th->tcp_csum); | |
855 | } | |
856 | ||
857 | /* Sets the UDP source and destination port ('src' and 'dst' respectively) of | |
858 | * the UDP header contained in 'packet'. 'packet' must be a valid UDP packet | |
859 | * with its l4 marker properly populated. */ | |
860 | void | |
861 | packet_set_udp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst) | |
862 | { | |
863 | struct udp_header *uh = packet->l4; | |
864 | ||
865 | if (uh->udp_csum) { | |
866 | packet_set_port(&uh->udp_src, src, &uh->udp_csum); | |
867 | packet_set_port(&uh->udp_dst, dst, &uh->udp_csum); | |
868 | ||
869 | if (!uh->udp_csum) { | |
870 | uh->udp_csum = htons(0xffff); | |
871 | } | |
872 | } else { | |
873 | uh->udp_src = src; | |
874 | uh->udp_dst = dst; | |
875 | } | |
876 | } | |
12113c39 | 877 | |
c6bcb685 JS |
878 | /* Sets the SCTP source and destination port ('src' and 'dst' respectively) of |
879 | * the SCTP header contained in 'packet'. 'packet' must be a valid SCTP packet | |
880 | * with its l4 marker properly populated. */ | |
881 | void | |
882 | packet_set_sctp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst) | |
883 | { | |
884 | struct sctp_header *sh = packet->l4; | |
885 | ovs_be32 old_csum, old_correct_csum, new_csum; | |
886 | uint16_t tp_len = packet->size - ((uint8_t*)sh - (uint8_t*)packet->data); | |
887 | ||
888 | old_csum = sh->sctp_csum; | |
889 | sh->sctp_csum = 0; | |
890 | old_correct_csum = crc32c(packet->l4, tp_len); | |
891 | ||
892 | sh->sctp_src = src; | |
893 | sh->sctp_dst = dst; | |
894 | ||
895 | new_csum = crc32c(packet->l4, tp_len); | |
896 | sh->sctp_csum = old_csum ^ old_correct_csum ^ new_csum; | |
897 | } | |
898 | ||
61bf6666 JR |
899 | const char * |
900 | packet_tcp_flag_to_string(uint32_t flag) | |
901 | { | |
902 | switch (flag) { | |
903 | case TCP_FIN: | |
904 | return "fin"; | |
905 | case TCP_SYN: | |
906 | return "syn"; | |
907 | case TCP_RST: | |
908 | return "rst"; | |
909 | case TCP_PSH: | |
910 | return "psh"; | |
911 | case TCP_ACK: | |
912 | return "ack"; | |
913 | case TCP_URG: | |
914 | return "urg"; | |
915 | case TCP_ECE: | |
916 | return "ece"; | |
917 | case TCP_CWR: | |
918 | return "cwr"; | |
919 | case TCP_NS: | |
920 | return "ns"; | |
921 | case 0x200: | |
922 | return "[200]"; | |
923 | case 0x400: | |
924 | return "[400]"; | |
925 | case 0x800: | |
926 | return "[800]"; | |
927 | default: | |
928 | return NULL; | |
929 | } | |
930 | } | |
931 | ||
7393104d | 932 | /* Appends a string representation of the TCP flags value 'tcp_flags' |
f41b5b3b | 933 | * (e.g. from struct flow.tcp_flags or obtained via TCP_FLAGS) to 's', in the |
7393104d BP |
934 | * format used by tcpdump. */ |
935 | void | |
a66733a8 | 936 | packet_format_tcp_flags(struct ds *s, uint16_t tcp_flags) |
7393104d BP |
937 | { |
938 | if (!tcp_flags) { | |
939 | ds_put_cstr(s, "none"); | |
940 | return; | |
941 | } | |
942 | ||
943 | if (tcp_flags & TCP_SYN) { | |
944 | ds_put_char(s, 'S'); | |
945 | } | |
946 | if (tcp_flags & TCP_FIN) { | |
947 | ds_put_char(s, 'F'); | |
948 | } | |
949 | if (tcp_flags & TCP_PSH) { | |
950 | ds_put_char(s, 'P'); | |
951 | } | |
952 | if (tcp_flags & TCP_RST) { | |
953 | ds_put_char(s, 'R'); | |
954 | } | |
955 | if (tcp_flags & TCP_URG) { | |
956 | ds_put_char(s, 'U'); | |
957 | } | |
958 | if (tcp_flags & TCP_ACK) { | |
959 | ds_put_char(s, '.'); | |
960 | } | |
a66733a8 JR |
961 | if (tcp_flags & TCP_ECE) { |
962 | ds_put_cstr(s, "E"); | |
7393104d | 963 | } |
a66733a8 JR |
964 | if (tcp_flags & TCP_CWR) { |
965 | ds_put_cstr(s, "C"); | |
966 | } | |
967 | if (tcp_flags & TCP_NS) { | |
968 | ds_put_cstr(s, "N"); | |
969 | } | |
970 | if (tcp_flags & 0x200) { | |
971 | ds_put_cstr(s, "[200]"); | |
972 | } | |
973 | if (tcp_flags & 0x400) { | |
974 | ds_put_cstr(s, "[400]"); | |
975 | } | |
976 | if (tcp_flags & 0x800) { | |
977 | ds_put_cstr(s, "[800]"); | |
7393104d BP |
978 | } |
979 | } |