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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" |
7c457c33 | 32 | #include "unaligned.h" |
b9e8b45a | 33 | |
d31f1109 JP |
34 | const struct in6_addr in6addr_exact = IN6ADDR_EXACT_INIT; |
35 | ||
093ca5b3 BP |
36 | /* Parses 's' as a 16-digit hexadecimal number representing a datapath ID. On |
37 | * success stores the dpid into '*dpidp' and returns true, on failure stores 0 | |
38 | * into '*dpidp' and returns false. | |
39 | * | |
40 | * Rejects an all-zeros dpid as invalid. */ | |
76343538 BP |
41 | bool |
42 | dpid_from_string(const char *s, uint64_t *dpidp) | |
43 | { | |
b123cc3c | 44 | *dpidp = (strlen(s) == 16 && strspn(s, "0123456789abcdefABCDEF") == 16 |
093ca5b3 | 45 | ? strtoull(s, NULL, 16) |
76343538 BP |
46 | : 0); |
47 | return *dpidp != 0; | |
48 | } | |
49 | ||
7d48a4cc BP |
50 | /* Returns true if 'ea' is a reserved address, that a bridge must never |
51 | * forward, false otherwise. | |
05be4e2c EJ |
52 | * |
53 | * If you change this function's behavior, please update corresponding | |
54 | * documentation in vswitch.xml at the same time. */ | |
55 | bool | |
56 | eth_addr_is_reserved(const uint8_t ea[ETH_ADDR_LEN]) | |
57 | { | |
7d48a4cc BP |
58 | struct eth_addr_node { |
59 | struct hmap_node hmap_node; | |
8c45d00f | 60 | const uint64_t ea64; |
05be4e2c EJ |
61 | }; |
62 | ||
7d48a4cc BP |
63 | static struct eth_addr_node nodes[] = { |
64 | /* STP, IEEE pause frames, and other reserved protocols. */ | |
f0ac9da9 BP |
65 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000000ULL }, |
66 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000001ULL }, | |
67 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000002ULL }, | |
68 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000003ULL }, | |
69 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000004ULL }, | |
70 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000005ULL }, | |
71 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000006ULL }, | |
72 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000007ULL }, | |
73 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000008ULL }, | |
74 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000009ULL }, | |
75 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000aULL }, | |
76 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000bULL }, | |
77 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000cULL }, | |
78 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000dULL }, | |
79 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000eULL }, | |
80 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000fULL }, | |
7d48a4cc BP |
81 | |
82 | /* Extreme protocols. */ | |
83 | { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000000ULL }, /* EDP. */ | |
84 | { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000004ULL }, /* EAPS. */ | |
85 | { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000006ULL }, /* EAPS. */ | |
86 | ||
87 | /* Cisco protocols. */ | |
88 | { HMAP_NODE_NULL_INITIALIZER, 0x01000c000000ULL }, /* ISL. */ | |
89 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccccULL }, /* PAgP, UDLD, CDP, | |
90 | * DTP, VTP. */ | |
91 | { HMAP_NODE_NULL_INITIALIZER, 0x01000ccccccdULL }, /* PVST+. */ | |
92 | { HMAP_NODE_NULL_INITIALIZER, 0x01000ccdcdcdULL }, /* STP Uplink Fast, | |
93 | * FlexLink. */ | |
94 | ||
95 | /* Cisco CFM. */ | |
96 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc0ULL }, | |
97 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc1ULL }, | |
98 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc2ULL }, | |
99 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc3ULL }, | |
100 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc4ULL }, | |
101 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc5ULL }, | |
102 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc6ULL }, | |
103 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc7ULL }, | |
104 | }; | |
05be4e2c | 105 | |
8c45d00f | 106 | static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER; |
7d48a4cc | 107 | struct eth_addr_node *node; |
8c45d00f | 108 | static struct hmap addrs; |
7d48a4cc | 109 | uint64_t ea64; |
05be4e2c | 110 | |
8c45d00f BP |
111 | if (ovsthread_once_start(&once)) { |
112 | hmap_init(&addrs); | |
7d48a4cc BP |
113 | for (node = nodes; node < &nodes[ARRAY_SIZE(nodes)]; node++) { |
114 | hmap_insert(&addrs, &node->hmap_node, | |
115 | hash_2words(node->ea64, node->ea64 >> 32)); | |
116 | } | |
8c45d00f | 117 | ovsthread_once_done(&once); |
7d48a4cc | 118 | } |
05be4e2c | 119 | |
7d48a4cc BP |
120 | ea64 = eth_addr_to_uint64(ea); |
121 | HMAP_FOR_EACH_IN_BUCKET (node, hmap_node, hash_2words(ea64, ea64 >> 32), | |
122 | &addrs) { | |
123 | if (node->ea64 == ea64) { | |
05be4e2c EJ |
124 | return true; |
125 | } | |
126 | } | |
127 | return false; | |
128 | } | |
129 | ||
76343538 BP |
130 | bool |
131 | eth_addr_from_string(const char *s, uint8_t ea[ETH_ADDR_LEN]) | |
132 | { | |
c2c28dfd | 133 | if (ovs_scan(s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(ea))) { |
76343538 BP |
134 | return true; |
135 | } else { | |
136 | memset(ea, 0, ETH_ADDR_LEN); | |
137 | return false; | |
138 | } | |
139 | } | |
140 | ||
38f7147c | 141 | /* Fills 'b' with a Reverse ARP packet with Ethernet source address 'eth_src'. |
b9e8b45a | 142 | * This function is used by Open vSwitch to compose packets in cases where |
38f7147c EJ |
143 | * context is important but content doesn't (or shouldn't) matter. |
144 | * | |
145 | * The returned packet has enough headroom to insert an 802.1Q VLAN header if | |
146 | * desired. */ | |
b9e8b45a | 147 | void |
2ea838ac | 148 | compose_rarp(struct ofpbuf *b, const uint8_t eth_src[ETH_ADDR_LEN]) |
b9e8b45a | 149 | { |
38f7147c | 150 | struct eth_header *eth; |
7cb57d10 | 151 | struct arp_eth_header *arp; |
b9e8b45a | 152 | |
38f7147c | 153 | ofpbuf_clear(b); |
bb622f82 | 154 | ofpbuf_prealloc_tailroom(b, 2 + ETH_HEADER_LEN + VLAN_HEADER_LEN |
7cb57d10 | 155 | + ARP_ETH_HEADER_LEN); |
bb622f82 | 156 | ofpbuf_reserve(b, 2 + VLAN_HEADER_LEN); |
38f7147c EJ |
157 | eth = ofpbuf_put_uninit(b, sizeof *eth); |
158 | memcpy(eth->eth_dst, eth_addr_broadcast, ETH_ADDR_LEN); | |
159 | memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN); | |
160 | eth->eth_type = htons(ETH_TYPE_RARP); | |
161 | ||
7cb57d10 EJ |
162 | arp = ofpbuf_put_uninit(b, sizeof *arp); |
163 | arp->ar_hrd = htons(ARP_HRD_ETHERNET); | |
164 | arp->ar_pro = htons(ARP_PRO_IP); | |
165 | arp->ar_hln = sizeof arp->ar_sha; | |
166 | arp->ar_pln = sizeof arp->ar_spa; | |
167 | arp->ar_op = htons(ARP_OP_RARP); | |
168 | memcpy(arp->ar_sha, eth_src, ETH_ADDR_LEN); | |
7c457c33 | 169 | put_16aligned_be32(&arp->ar_spa, htonl(0)); |
7cb57d10 | 170 | memcpy(arp->ar_tha, eth_src, ETH_ADDR_LEN); |
7c457c33 | 171 | put_16aligned_be32(&arp->ar_tpa, htonl(0)); |
b9e8b45a | 172 | } |
d31f1109 | 173 | |
d9065a90 | 174 | /* Insert VLAN header according to given TCI. Packet passed must be Ethernet |
2f4ca41b | 175 | * packet. Ignores the CFI bit of 'tci' using 0 instead. |
7c66b273 BP |
176 | * |
177 | * Also sets 'packet->l2' to point to the new Ethernet header. */ | |
178 | void | |
d9065a90 | 179 | eth_push_vlan(struct ofpbuf *packet, ovs_be16 tci) |
7c66b273 BP |
180 | { |
181 | struct eth_header *eh = packet->data; | |
182 | struct vlan_eth_header *veh; | |
183 | ||
d9065a90 PS |
184 | /* Insert new 802.1Q header. */ |
185 | struct vlan_eth_header tmp; | |
186 | memcpy(tmp.veth_dst, eh->eth_dst, ETH_ADDR_LEN); | |
187 | memcpy(tmp.veth_src, eh->eth_src, ETH_ADDR_LEN); | |
188 | tmp.veth_type = htons(ETH_TYPE_VLAN); | |
2f4ca41b | 189 | tmp.veth_tci = tci & htons(~VLAN_CFI); |
d9065a90 PS |
190 | tmp.veth_next_type = eh->eth_type; |
191 | ||
192 | veh = ofpbuf_push_uninit(packet, VLAN_HEADER_LEN); | |
193 | memcpy(veh, &tmp, sizeof tmp); | |
7c66b273 | 194 | |
7c66b273 BP |
195 | packet->l2 = packet->data; |
196 | } | |
197 | ||
f4ebc25e BP |
198 | /* Removes outermost VLAN header (if any is present) from 'packet'. |
199 | * | |
b02475c5 SH |
200 | * 'packet->l2_5' should initially point to 'packet''s outer-most MPLS header |
201 | * or may be NULL if there are no MPLS headers. */ | |
f4ebc25e BP |
202 | void |
203 | eth_pop_vlan(struct ofpbuf *packet) | |
204 | { | |
205 | struct vlan_eth_header *veh = packet->l2; | |
206 | if (packet->size >= sizeof *veh | |
207 | && veh->veth_type == htons(ETH_TYPE_VLAN)) { | |
208 | struct eth_header tmp; | |
209 | ||
210 | memcpy(tmp.eth_dst, veh->veth_dst, ETH_ADDR_LEN); | |
211 | memcpy(tmp.eth_src, veh->veth_src, ETH_ADDR_LEN); | |
212 | tmp.eth_type = veh->veth_next_type; | |
213 | ||
214 | ofpbuf_pull(packet, VLAN_HEADER_LEN); | |
215 | packet->l2 = (char*)packet->l2 + VLAN_HEADER_LEN; | |
216 | memcpy(packet->data, &tmp, sizeof tmp); | |
217 | } | |
218 | } | |
219 | ||
b02475c5 SH |
220 | /* Set ethertype of the packet. */ |
221 | void | |
222 | set_ethertype(struct ofpbuf *packet, ovs_be16 eth_type) | |
223 | { | |
224 | struct eth_header *eh = packet->data; | |
225 | ||
226 | if (eh->eth_type == htons(ETH_TYPE_VLAN)) { | |
227 | ovs_be16 *p; | |
db5a1019 AW |
228 | p = ALIGNED_CAST(ovs_be16 *, |
229 | (char *)(packet->l2_5 ? packet->l2_5 : packet->l3) - 2); | |
b02475c5 SH |
230 | *p = eth_type; |
231 | } else { | |
232 | eh->eth_type = eth_type; | |
233 | } | |
234 | } | |
235 | ||
236 | static bool is_mpls(struct ofpbuf *packet) | |
237 | { | |
238 | return packet->l2_5 != NULL; | |
239 | } | |
240 | ||
241 | /* Set time to live (TTL) of an MPLS label stack entry (LSE). */ | |
b676167a | 242 | void |
b02475c5 SH |
243 | set_mpls_lse_ttl(ovs_be32 *lse, uint8_t ttl) |
244 | { | |
245 | *lse &= ~htonl(MPLS_TTL_MASK); | |
246 | *lse |= htonl((ttl << MPLS_TTL_SHIFT) & MPLS_TTL_MASK); | |
247 | } | |
248 | ||
249 | /* Set traffic class (TC) of an MPLS label stack entry (LSE). */ | |
250 | void | |
251 | set_mpls_lse_tc(ovs_be32 *lse, uint8_t tc) | |
252 | { | |
253 | *lse &= ~htonl(MPLS_TC_MASK); | |
254 | *lse |= htonl((tc << MPLS_TC_SHIFT) & MPLS_TC_MASK); | |
255 | } | |
256 | ||
257 | /* Set label of an MPLS label stack entry (LSE). */ | |
258 | void | |
259 | set_mpls_lse_label(ovs_be32 *lse, ovs_be32 label) | |
260 | { | |
261 | *lse &= ~htonl(MPLS_LABEL_MASK); | |
262 | *lse |= htonl((ntohl(label) << MPLS_LABEL_SHIFT) & MPLS_LABEL_MASK); | |
263 | } | |
264 | ||
265 | /* Set bottom of stack (BoS) bit of an MPLS label stack entry (LSE). */ | |
266 | void | |
267 | set_mpls_lse_bos(ovs_be32 *lse, uint8_t bos) | |
268 | { | |
269 | *lse &= ~htonl(MPLS_BOS_MASK); | |
270 | *lse |= htonl((bos << MPLS_BOS_SHIFT) & MPLS_BOS_MASK); | |
271 | } | |
272 | ||
273 | /* Compose an MPLS label stack entry (LSE) from its components: | |
274 | * label, traffic class (TC), time to live (TTL) and | |
275 | * bottom of stack (BoS) bit. */ | |
276 | ovs_be32 | |
277 | set_mpls_lse_values(uint8_t ttl, uint8_t tc, uint8_t bos, ovs_be32 label) | |
278 | { | |
279 | ovs_be32 lse = htonl(0); | |
280 | set_mpls_lse_ttl(&lse, ttl); | |
281 | set_mpls_lse_tc(&lse, tc); | |
282 | set_mpls_lse_bos(&lse, bos); | |
283 | set_mpls_lse_label(&lse, label); | |
284 | return lse; | |
285 | } | |
286 | ||
287 | /* Push an new MPLS stack entry onto the MPLS stack and adjust 'packet->l2' and | |
288 | * 'packet->l2_5' accordingly. The new entry will be the outermost entry on | |
289 | * the stack. | |
290 | * | |
291 | * Previous to calling this function, 'packet->l2_5' must be set; if the MPLS | |
292 | * label to be pushed will be the first label in 'packet', then it should be | |
293 | * the same as 'packet->l3'. */ | |
294 | static void | |
295 | push_mpls_lse(struct ofpbuf *packet, struct mpls_hdr *mh) | |
296 | { | |
297 | char * header; | |
298 | size_t len; | |
299 | header = ofpbuf_push_uninit(packet, MPLS_HLEN); | |
300 | len = (char *)packet->l2_5 - (char *)packet->l2; | |
301 | memmove(header, packet->l2, len); | |
302 | memcpy(header + len, mh, sizeof *mh); | |
303 | packet->l2 = (char*)packet->l2 - MPLS_HLEN; | |
304 | packet->l2_5 = (char*)packet->l2_5 - MPLS_HLEN; | |
305 | } | |
306 | ||
307 | /* Set MPLS label stack entry to outermost MPLS header.*/ | |
308 | void | |
309 | set_mpls_lse(struct ofpbuf *packet, ovs_be32 mpls_lse) | |
310 | { | |
311 | struct mpls_hdr *mh = packet->l2_5; | |
312 | ||
313 | /* Packet type should be MPLS to set label stack entry. */ | |
314 | if (is_mpls(packet)) { | |
315 | /* Update mpls label stack entry. */ | |
316 | mh->mpls_lse = mpls_lse; | |
317 | } | |
318 | } | |
319 | ||
320 | /* Push MPLS label stack entry 'lse' onto 'packet' as the the outermost MPLS | |
321 | * header. If 'packet' does not already have any MPLS labels, then its | |
322 | * Ethertype is changed to 'ethtype' (which must be an MPLS Ethertype). */ | |
323 | void | |
324 | push_mpls(struct ofpbuf *packet, ovs_be16 ethtype, ovs_be32 lse) | |
325 | { | |
326 | struct mpls_hdr mh; | |
327 | ||
328 | if (!eth_type_mpls(ethtype)) { | |
329 | return; | |
330 | } | |
331 | ||
332 | if (!is_mpls(packet)) { | |
333 | /* Set ethtype and MPLS label stack entry. */ | |
334 | set_ethertype(packet, ethtype); | |
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 | { | |
aad29cd1 BP |
428 | return 32 - ctz(ntohl(netmask)); |
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); |
c97664b3 EJ |
620 | |
621 | if (nh->ip_proto == IPPROTO_TCP && packet->l7) { | |
622 | struct tcp_header *th = packet->l4; | |
623 | ||
7c457c33 | 624 | th->tcp_csum = recalc_csum32(th->tcp_csum, old_addr, new_addr); |
c97664b3 EJ |
625 | } else if (nh->ip_proto == IPPROTO_UDP && packet->l7) { |
626 | struct udp_header *uh = packet->l4; | |
627 | ||
628 | if (uh->udp_csum) { | |
7c457c33 | 629 | uh->udp_csum = recalc_csum32(uh->udp_csum, old_addr, new_addr); |
c97664b3 EJ |
630 | if (!uh->udp_csum) { |
631 | uh->udp_csum = htons(0xffff); | |
632 | } | |
633 | } | |
634 | } | |
7c457c33 BP |
635 | nh->ip_csum = recalc_csum32(nh->ip_csum, old_addr, new_addr); |
636 | put_16aligned_be32(addr, new_addr); | |
c97664b3 EJ |
637 | } |
638 | ||
bc7a5acd AA |
639 | /* Returns true, if packet contains at least one routing header where |
640 | * segements_left > 0. | |
641 | * | |
642 | * This function assumes that L3 and L4 markers are set in the packet. */ | |
643 | static bool | |
644 | packet_rh_present(struct ofpbuf *packet) | |
645 | { | |
4528f34f | 646 | const struct ovs_16aligned_ip6_hdr *nh; |
bc7a5acd AA |
647 | int nexthdr; |
648 | size_t len; | |
649 | size_t remaining; | |
650 | uint8_t *data = packet->l3; | |
651 | ||
652 | remaining = (uint8_t *)packet->l4 - (uint8_t *)packet->l3; | |
653 | ||
654 | if (remaining < sizeof *nh) { | |
655 | return false; | |
656 | } | |
4528f34f | 657 | nh = ALIGNED_CAST(struct ovs_16aligned_ip6_hdr *, data); |
bc7a5acd AA |
658 | data += sizeof *nh; |
659 | remaining -= sizeof *nh; | |
660 | nexthdr = nh->ip6_nxt; | |
661 | ||
662 | while (1) { | |
663 | if ((nexthdr != IPPROTO_HOPOPTS) | |
664 | && (nexthdr != IPPROTO_ROUTING) | |
665 | && (nexthdr != IPPROTO_DSTOPTS) | |
666 | && (nexthdr != IPPROTO_AH) | |
667 | && (nexthdr != IPPROTO_FRAGMENT)) { | |
668 | /* It's either a terminal header (e.g., TCP, UDP) or one we | |
669 | * don't understand. In either case, we're done with the | |
670 | * packet, so use it to fill in 'nw_proto'. */ | |
671 | break; | |
672 | } | |
673 | ||
674 | /* We only verify that at least 8 bytes of the next header are | |
675 | * available, but many of these headers are longer. Ensure that | |
676 | * accesses within the extension header are within those first 8 | |
677 | * bytes. All extension headers are required to be at least 8 | |
678 | * bytes. */ | |
679 | if (remaining < 8) { | |
680 | return false; | |
681 | } | |
682 | ||
683 | if (nexthdr == IPPROTO_AH) { | |
684 | /* A standard AH definition isn't available, but the fields | |
685 | * we care about are in the same location as the generic | |
686 | * option header--only the header length is calculated | |
687 | * differently. */ | |
688 | const struct ip6_ext *ext_hdr = (struct ip6_ext *)data; | |
689 | ||
690 | nexthdr = ext_hdr->ip6e_nxt; | |
691 | len = (ext_hdr->ip6e_len + 2) * 4; | |
692 | } else if (nexthdr == IPPROTO_FRAGMENT) { | |
4528f34f BP |
693 | const struct ovs_16aligned_ip6_frag *frag_hdr |
694 | = ALIGNED_CAST(struct ovs_16aligned_ip6_frag *, data); | |
bc7a5acd AA |
695 | |
696 | nexthdr = frag_hdr->ip6f_nxt; | |
697 | len = sizeof *frag_hdr; | |
698 | } else if (nexthdr == IPPROTO_ROUTING) { | |
699 | const struct ip6_rthdr *rh = (struct ip6_rthdr *)data; | |
700 | ||
701 | if (rh->ip6r_segleft > 0) { | |
702 | return true; | |
703 | } | |
704 | ||
705 | nexthdr = rh->ip6r_nxt; | |
706 | len = (rh->ip6r_len + 1) * 8; | |
707 | } else { | |
708 | const struct ip6_ext *ext_hdr = (struct ip6_ext *)data; | |
709 | ||
710 | nexthdr = ext_hdr->ip6e_nxt; | |
711 | len = (ext_hdr->ip6e_len + 1) * 8; | |
712 | } | |
713 | ||
714 | if (remaining < len) { | |
715 | return false; | |
716 | } | |
717 | remaining -= len; | |
718 | data += len; | |
719 | } | |
720 | ||
721 | return false; | |
722 | } | |
723 | ||
724 | static void | |
725 | packet_update_csum128(struct ofpbuf *packet, uint8_t proto, | |
4528f34f | 726 | ovs_16aligned_be32 addr[4], const ovs_be32 new_addr[4]) |
bc7a5acd AA |
727 | { |
728 | if (proto == IPPROTO_TCP && packet->l7) { | |
729 | struct tcp_header *th = packet->l4; | |
730 | ||
731 | th->tcp_csum = recalc_csum128(th->tcp_csum, addr, new_addr); | |
732 | } else if (proto == IPPROTO_UDP && packet->l7) { | |
733 | struct udp_header *uh = packet->l4; | |
734 | ||
735 | if (uh->udp_csum) { | |
736 | uh->udp_csum = recalc_csum128(uh->udp_csum, addr, new_addr); | |
737 | if (!uh->udp_csum) { | |
738 | uh->udp_csum = htons(0xffff); | |
739 | } | |
740 | } | |
741 | } | |
742 | } | |
743 | ||
744 | static void | |
745 | packet_set_ipv6_addr(struct ofpbuf *packet, uint8_t proto, | |
4528f34f | 746 | ovs_16aligned_be32 *addr, const ovs_be32 new_addr[4], |
bc7a5acd AA |
747 | bool recalculate_csum) |
748 | { | |
749 | if (recalculate_csum) { | |
4528f34f | 750 | packet_update_csum128(packet, proto, addr, new_addr); |
bc7a5acd AA |
751 | } |
752 | memcpy(addr, new_addr, sizeof(*addr)); | |
753 | } | |
754 | ||
755 | static void | |
4528f34f | 756 | packet_set_ipv6_flow_label(ovs_16aligned_be32 *flow_label, ovs_be32 flow_key) |
bc7a5acd | 757 | { |
4528f34f BP |
758 | ovs_be32 old_label = get_16aligned_be32(flow_label); |
759 | ovs_be32 new_label = (old_label & htonl(~IPV6_LABEL_MASK)) | flow_key; | |
760 | put_16aligned_be32(flow_label, new_label); | |
bc7a5acd AA |
761 | } |
762 | ||
763 | static void | |
4528f34f | 764 | packet_set_ipv6_tc(ovs_16aligned_be32 *flow_label, uint8_t tc) |
bc7a5acd | 765 | { |
4528f34f BP |
766 | ovs_be32 old_label = get_16aligned_be32(flow_label); |
767 | ovs_be32 new_label = (old_label & htonl(0xF00FFFFF)) | htonl(tc << 20); | |
768 | put_16aligned_be32(flow_label, new_label); | |
bc7a5acd AA |
769 | } |
770 | ||
c97664b3 EJ |
771 | /* Modifies the IPv4 header fields of 'packet' to be consistent with 'src', |
772 | * 'dst', 'tos', and 'ttl'. Updates 'packet''s L4 checksums as appropriate. | |
773 | * 'packet' must contain a valid IPv4 packet with correctly populated l[347] | |
774 | * markers. */ | |
775 | void | |
776 | packet_set_ipv4(struct ofpbuf *packet, ovs_be32 src, ovs_be32 dst, | |
777 | uint8_t tos, uint8_t ttl) | |
778 | { | |
779 | struct ip_header *nh = packet->l3; | |
780 | ||
7c457c33 | 781 | if (get_16aligned_be32(&nh->ip_src) != src) { |
c97664b3 EJ |
782 | packet_set_ipv4_addr(packet, &nh->ip_src, src); |
783 | } | |
784 | ||
7c457c33 | 785 | if (get_16aligned_be32(&nh->ip_dst) != dst) { |
c97664b3 EJ |
786 | packet_set_ipv4_addr(packet, &nh->ip_dst, dst); |
787 | } | |
788 | ||
789 | if (nh->ip_tos != tos) { | |
790 | uint8_t *field = &nh->ip_tos; | |
791 | ||
792 | nh->ip_csum = recalc_csum16(nh->ip_csum, htons((uint16_t) *field), | |
793 | htons((uint16_t) tos)); | |
794 | *field = tos; | |
795 | } | |
796 | ||
797 | if (nh->ip_ttl != ttl) { | |
798 | uint8_t *field = &nh->ip_ttl; | |
799 | ||
800 | nh->ip_csum = recalc_csum16(nh->ip_csum, htons(*field << 8), | |
801 | htons(ttl << 8)); | |
802 | *field = ttl; | |
803 | } | |
804 | } | |
805 | ||
bc7a5acd AA |
806 | /* Modifies the IPv6 header fields of 'packet' to be consistent with 'src', |
807 | * 'dst', 'traffic class', and 'next hop'. Updates 'packet''s L4 checksums as | |
808 | * appropriate. 'packet' must contain a valid IPv6 packet with correctly | |
809 | * populated l[347] markers. */ | |
810 | void | |
811 | packet_set_ipv6(struct ofpbuf *packet, uint8_t proto, const ovs_be32 src[4], | |
812 | const ovs_be32 dst[4], uint8_t key_tc, ovs_be32 key_fl, | |
813 | uint8_t key_hl) | |
814 | { | |
4528f34f | 815 | struct ovs_16aligned_ip6_hdr *nh = packet->l3; |
bc7a5acd AA |
816 | |
817 | if (memcmp(&nh->ip6_src, src, sizeof(ovs_be32[4]))) { | |
4528f34f | 818 | packet_set_ipv6_addr(packet, proto, nh->ip6_src.be32, src, true); |
bc7a5acd AA |
819 | } |
820 | ||
821 | if (memcmp(&nh->ip6_dst, dst, sizeof(ovs_be32[4]))) { | |
4528f34f | 822 | packet_set_ipv6_addr(packet, proto, nh->ip6_dst.be32, dst, |
bc7a5acd AA |
823 | !packet_rh_present(packet)); |
824 | } | |
825 | ||
826 | packet_set_ipv6_tc(&nh->ip6_flow, key_tc); | |
827 | ||
828 | packet_set_ipv6_flow_label(&nh->ip6_flow, key_fl); | |
829 | ||
830 | nh->ip6_hlim = key_hl; | |
831 | } | |
832 | ||
c97664b3 EJ |
833 | static void |
834 | packet_set_port(ovs_be16 *port, ovs_be16 new_port, ovs_be16 *csum) | |
835 | { | |
836 | if (*port != new_port) { | |
837 | *csum = recalc_csum16(*csum, *port, new_port); | |
838 | *port = new_port; | |
839 | } | |
840 | } | |
841 | ||
842 | /* Sets the TCP source and destination port ('src' and 'dst' respectively) of | |
843 | * the TCP header contained in 'packet'. 'packet' must be a valid TCP packet | |
844 | * with its l4 marker properly populated. */ | |
845 | void | |
846 | packet_set_tcp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst) | |
847 | { | |
848 | struct tcp_header *th = packet->l4; | |
849 | ||
850 | packet_set_port(&th->tcp_src, src, &th->tcp_csum); | |
851 | packet_set_port(&th->tcp_dst, dst, &th->tcp_csum); | |
852 | } | |
853 | ||
854 | /* Sets the UDP source and destination port ('src' and 'dst' respectively) of | |
855 | * the UDP header contained in 'packet'. 'packet' must be a valid UDP packet | |
856 | * with its l4 marker properly populated. */ | |
857 | void | |
858 | packet_set_udp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst) | |
859 | { | |
860 | struct udp_header *uh = packet->l4; | |
861 | ||
862 | if (uh->udp_csum) { | |
863 | packet_set_port(&uh->udp_src, src, &uh->udp_csum); | |
864 | packet_set_port(&uh->udp_dst, dst, &uh->udp_csum); | |
865 | ||
866 | if (!uh->udp_csum) { | |
867 | uh->udp_csum = htons(0xffff); | |
868 | } | |
869 | } else { | |
870 | uh->udp_src = src; | |
871 | uh->udp_dst = dst; | |
872 | } | |
873 | } | |
12113c39 | 874 | |
c6bcb685 JS |
875 | /* Sets the SCTP source and destination port ('src' and 'dst' respectively) of |
876 | * the SCTP header contained in 'packet'. 'packet' must be a valid SCTP packet | |
877 | * with its l4 marker properly populated. */ | |
878 | void | |
879 | packet_set_sctp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst) | |
880 | { | |
881 | struct sctp_header *sh = packet->l4; | |
882 | ovs_be32 old_csum, old_correct_csum, new_csum; | |
883 | uint16_t tp_len = packet->size - ((uint8_t*)sh - (uint8_t*)packet->data); | |
884 | ||
885 | old_csum = sh->sctp_csum; | |
886 | sh->sctp_csum = 0; | |
887 | old_correct_csum = crc32c(packet->l4, tp_len); | |
888 | ||
889 | sh->sctp_src = src; | |
890 | sh->sctp_dst = dst; | |
891 | ||
892 | new_csum = crc32c(packet->l4, tp_len); | |
893 | sh->sctp_csum = old_csum ^ old_correct_csum ^ new_csum; | |
894 | } | |
895 | ||
12113c39 BP |
896 | /* If 'packet' is a TCP packet, returns the TCP flags. Otherwise, returns 0. |
897 | * | |
898 | * 'flow' must be the flow corresponding to 'packet' and 'packet''s header | |
899 | * pointers must be properly initialized (e.g. with flow_extract()). */ | |
a66733a8 | 900 | uint16_t |
12113c39 BP |
901 | packet_get_tcp_flags(const struct ofpbuf *packet, const struct flow *flow) |
902 | { | |
cff78c88 | 903 | if (dl_type_is_ip_any(flow->dl_type) && |
e8c16d83 | 904 | flow->nw_proto == IPPROTO_TCP && packet->l7) { |
12113c39 BP |
905 | const struct tcp_header *tcp = packet->l4; |
906 | return TCP_FLAGS(tcp->tcp_ctl); | |
907 | } else { | |
908 | return 0; | |
909 | } | |
910 | } | |
7393104d | 911 | |
61bf6666 JR |
912 | const char * |
913 | packet_tcp_flag_to_string(uint32_t flag) | |
914 | { | |
915 | switch (flag) { | |
916 | case TCP_FIN: | |
917 | return "fin"; | |
918 | case TCP_SYN: | |
919 | return "syn"; | |
920 | case TCP_RST: | |
921 | return "rst"; | |
922 | case TCP_PSH: | |
923 | return "psh"; | |
924 | case TCP_ACK: | |
925 | return "ack"; | |
926 | case TCP_URG: | |
927 | return "urg"; | |
928 | case TCP_ECE: | |
929 | return "ece"; | |
930 | case TCP_CWR: | |
931 | return "cwr"; | |
932 | case TCP_NS: | |
933 | return "ns"; | |
934 | case 0x200: | |
935 | return "[200]"; | |
936 | case 0x400: | |
937 | return "[400]"; | |
938 | case 0x800: | |
939 | return "[800]"; | |
940 | default: | |
941 | return NULL; | |
942 | } | |
943 | } | |
944 | ||
7393104d BP |
945 | /* Appends a string representation of the TCP flags value 'tcp_flags' |
946 | * (e.g. obtained via packet_get_tcp_flags() or TCP_FLAGS) to 's', in the | |
947 | * format used by tcpdump. */ | |
948 | void | |
a66733a8 | 949 | packet_format_tcp_flags(struct ds *s, uint16_t tcp_flags) |
7393104d BP |
950 | { |
951 | if (!tcp_flags) { | |
952 | ds_put_cstr(s, "none"); | |
953 | return; | |
954 | } | |
955 | ||
956 | if (tcp_flags & TCP_SYN) { | |
957 | ds_put_char(s, 'S'); | |
958 | } | |
959 | if (tcp_flags & TCP_FIN) { | |
960 | ds_put_char(s, 'F'); | |
961 | } | |
962 | if (tcp_flags & TCP_PSH) { | |
963 | ds_put_char(s, 'P'); | |
964 | } | |
965 | if (tcp_flags & TCP_RST) { | |
966 | ds_put_char(s, 'R'); | |
967 | } | |
968 | if (tcp_flags & TCP_URG) { | |
969 | ds_put_char(s, 'U'); | |
970 | } | |
971 | if (tcp_flags & TCP_ACK) { | |
972 | ds_put_char(s, '.'); | |
973 | } | |
a66733a8 JR |
974 | if (tcp_flags & TCP_ECE) { |
975 | ds_put_cstr(s, "E"); | |
7393104d | 976 | } |
a66733a8 JR |
977 | if (tcp_flags & TCP_CWR) { |
978 | ds_put_cstr(s, "C"); | |
979 | } | |
980 | if (tcp_flags & TCP_NS) { | |
981 | ds_put_cstr(s, "N"); | |
982 | } | |
983 | if (tcp_flags & 0x200) { | |
984 | ds_put_cstr(s, "[200]"); | |
985 | } | |
986 | if (tcp_flags & 0x400) { | |
987 | ds_put_cstr(s, "[400]"); | |
988 | } | |
989 | if (tcp_flags & 0x800) { | |
990 | ds_put_cstr(s, "[800]"); | |
7393104d BP |
991 | } |
992 | } |