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b9e8b45a | 1 | /* |
5fa008d4 | 2 | * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 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> |
00894212 | 23 | #include <netinet/icmp6.h> |
76343538 | 24 | #include <stdlib.h> |
d31f1109 | 25 | #include "byte-order.h" |
c97664b3 | 26 | #include "csum.h" |
c6bcb685 | 27 | #include "crc32c.h" |
12113c39 | 28 | #include "flow.h" |
7d48a4cc | 29 | #include "hmap.h" |
d31f1109 | 30 | #include "dynamic-string.h" |
b9e8b45a | 31 | #include "ofpbuf.h" |
8c45d00f | 32 | #include "ovs-thread.h" |
b5e7e61a | 33 | #include "odp-util.h" |
7c457c33 | 34 | #include "unaligned.h" |
b9e8b45a | 35 | |
d31f1109 JP |
36 | const struct in6_addr in6addr_exact = IN6ADDR_EXACT_INIT; |
37 | ||
093ca5b3 BP |
38 | /* Parses 's' as a 16-digit hexadecimal number representing a datapath ID. On |
39 | * success stores the dpid into '*dpidp' and returns true, on failure stores 0 | |
40 | * into '*dpidp' and returns false. | |
41 | * | |
42 | * Rejects an all-zeros dpid as invalid. */ | |
76343538 BP |
43 | bool |
44 | dpid_from_string(const char *s, uint64_t *dpidp) | |
45 | { | |
b123cc3c | 46 | *dpidp = (strlen(s) == 16 && strspn(s, "0123456789abcdefABCDEF") == 16 |
093ca5b3 | 47 | ? strtoull(s, NULL, 16) |
76343538 BP |
48 | : 0); |
49 | return *dpidp != 0; | |
50 | } | |
51 | ||
7d48a4cc BP |
52 | /* Returns true if 'ea' is a reserved address, that a bridge must never |
53 | * forward, false otherwise. | |
05be4e2c EJ |
54 | * |
55 | * If you change this function's behavior, please update corresponding | |
56 | * documentation in vswitch.xml at the same time. */ | |
57 | bool | |
58 | eth_addr_is_reserved(const uint8_t ea[ETH_ADDR_LEN]) | |
59 | { | |
7d48a4cc BP |
60 | struct eth_addr_node { |
61 | struct hmap_node hmap_node; | |
8c45d00f | 62 | const uint64_t ea64; |
05be4e2c EJ |
63 | }; |
64 | ||
7d48a4cc BP |
65 | static struct eth_addr_node nodes[] = { |
66 | /* STP, IEEE pause frames, and other reserved protocols. */ | |
f0ac9da9 BP |
67 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000000ULL }, |
68 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000001ULL }, | |
69 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000002ULL }, | |
70 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000003ULL }, | |
71 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000004ULL }, | |
72 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000005ULL }, | |
73 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000006ULL }, | |
74 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000007ULL }, | |
75 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000008ULL }, | |
76 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000009ULL }, | |
77 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000aULL }, | |
78 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000bULL }, | |
79 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000cULL }, | |
80 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000dULL }, | |
81 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000eULL }, | |
82 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000fULL }, | |
7d48a4cc BP |
83 | |
84 | /* Extreme protocols. */ | |
85 | { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000000ULL }, /* EDP. */ | |
86 | { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000004ULL }, /* EAPS. */ | |
87 | { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000006ULL }, /* EAPS. */ | |
88 | ||
89 | /* Cisco protocols. */ | |
90 | { HMAP_NODE_NULL_INITIALIZER, 0x01000c000000ULL }, /* ISL. */ | |
91 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccccULL }, /* PAgP, UDLD, CDP, | |
92 | * DTP, VTP. */ | |
93 | { HMAP_NODE_NULL_INITIALIZER, 0x01000ccccccdULL }, /* PVST+. */ | |
94 | { HMAP_NODE_NULL_INITIALIZER, 0x01000ccdcdcdULL }, /* STP Uplink Fast, | |
95 | * FlexLink. */ | |
96 | ||
97 | /* Cisco CFM. */ | |
98 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc0ULL }, | |
99 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc1ULL }, | |
100 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc2ULL }, | |
101 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc3ULL }, | |
102 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc4ULL }, | |
103 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc5ULL }, | |
104 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc6ULL }, | |
105 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc7ULL }, | |
106 | }; | |
05be4e2c | 107 | |
8c45d00f | 108 | static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER; |
7d48a4cc | 109 | struct eth_addr_node *node; |
8c45d00f | 110 | static struct hmap addrs; |
7d48a4cc | 111 | uint64_t ea64; |
05be4e2c | 112 | |
8c45d00f BP |
113 | if (ovsthread_once_start(&once)) { |
114 | hmap_init(&addrs); | |
7d48a4cc | 115 | for (node = nodes; node < &nodes[ARRAY_SIZE(nodes)]; node++) { |
965607c8 | 116 | hmap_insert(&addrs, &node->hmap_node, hash_uint64(node->ea64)); |
7d48a4cc | 117 | } |
8c45d00f | 118 | ovsthread_once_done(&once); |
7d48a4cc | 119 | } |
05be4e2c | 120 | |
7d48a4cc | 121 | ea64 = eth_addr_to_uint64(ea); |
965607c8 | 122 | HMAP_FOR_EACH_IN_BUCKET (node, hmap_node, hash_uint64(ea64), &addrs) { |
7d48a4cc | 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)); |
cf3b7538 JR |
172 | |
173 | ofpbuf_set_frame(b, eth); | |
174 | ofpbuf_set_l3(b, arp); | |
b9e8b45a | 175 | } |
d31f1109 | 176 | |
d9065a90 | 177 | /* Insert VLAN header according to given TCI. Packet passed must be Ethernet |
2f4ca41b | 178 | * packet. Ignores the CFI bit of 'tci' using 0 instead. |
7c66b273 | 179 | * |
cf3b7538 | 180 | * Also adjusts the layer offsets accordingly. */ |
7c66b273 | 181 | void |
1bf02876 | 182 | eth_push_vlan(struct ofpbuf *packet, ovs_be16 tpid, ovs_be16 tci) |
7c66b273 | 183 | { |
7c66b273 BP |
184 | struct vlan_eth_header *veh; |
185 | ||
d9065a90 | 186 | /* Insert new 802.1Q header. */ |
437d0d22 JR |
187 | veh = ofpbuf_resize_l2(packet, VLAN_HEADER_LEN); |
188 | memmove(veh, (char *)veh + VLAN_HEADER_LEN, 2 * ETH_ADDR_LEN); | |
189 | veh->veth_type = tpid; | |
190 | veh->veth_tci = tci & htons(~VLAN_CFI); | |
7c66b273 BP |
191 | } |
192 | ||
f4ebc25e BP |
193 | /* Removes outermost VLAN header (if any is present) from 'packet'. |
194 | * | |
b02475c5 SH |
195 | * 'packet->l2_5' should initially point to 'packet''s outer-most MPLS header |
196 | * or may be NULL if there are no MPLS headers. */ | |
f4ebc25e BP |
197 | void |
198 | eth_pop_vlan(struct ofpbuf *packet) | |
199 | { | |
cf3b7538 | 200 | struct vlan_eth_header *veh = ofpbuf_l2(packet); |
437d0d22 | 201 | |
cf3b7538 | 202 | if (veh && ofpbuf_size(packet) >= sizeof *veh |
f4ebc25e | 203 | && veh->veth_type == htons(ETH_TYPE_VLAN)) { |
f4ebc25e | 204 | |
437d0d22 JR |
205 | memmove((char *)veh + VLAN_HEADER_LEN, veh, 2 * ETH_ADDR_LEN); |
206 | ofpbuf_resize_l2(packet, -VLAN_HEADER_LEN); | |
f4ebc25e BP |
207 | } |
208 | } | |
209 | ||
b02475c5 | 210 | /* Set ethertype of the packet. */ |
56b02633 | 211 | static void |
b02475c5 SH |
212 | set_ethertype(struct ofpbuf *packet, ovs_be16 eth_type) |
213 | { | |
cf3b7538 JR |
214 | struct eth_header *eh = ofpbuf_l2(packet); |
215 | ||
216 | if (!eh) { | |
217 | return; | |
218 | } | |
b02475c5 SH |
219 | |
220 | if (eh->eth_type == htons(ETH_TYPE_VLAN)) { | |
221 | ovs_be16 *p; | |
6b8c377a | 222 | char *l2_5 = ofpbuf_l2_5(packet); |
437d0d22 | 223 | |
db5a1019 | 224 | p = ALIGNED_CAST(ovs_be16 *, |
6b8c377a | 225 | (l2_5 ? l2_5 : (char *)ofpbuf_l3(packet)) - 2); |
b02475c5 SH |
226 | *p = eth_type; |
227 | } else { | |
228 | eh->eth_type = eth_type; | |
229 | } | |
230 | } | |
231 | ||
232 | static bool is_mpls(struct ofpbuf *packet) | |
233 | { | |
437d0d22 | 234 | return packet->l2_5_ofs != UINT16_MAX; |
b02475c5 SH |
235 | } |
236 | ||
237 | /* Set time to live (TTL) of an MPLS label stack entry (LSE). */ | |
b676167a | 238 | void |
b02475c5 SH |
239 | set_mpls_lse_ttl(ovs_be32 *lse, uint8_t ttl) |
240 | { | |
241 | *lse &= ~htonl(MPLS_TTL_MASK); | |
242 | *lse |= htonl((ttl << MPLS_TTL_SHIFT) & MPLS_TTL_MASK); | |
243 | } | |
244 | ||
245 | /* Set traffic class (TC) of an MPLS label stack entry (LSE). */ | |
246 | void | |
247 | set_mpls_lse_tc(ovs_be32 *lse, uint8_t tc) | |
248 | { | |
249 | *lse &= ~htonl(MPLS_TC_MASK); | |
250 | *lse |= htonl((tc << MPLS_TC_SHIFT) & MPLS_TC_MASK); | |
251 | } | |
252 | ||
253 | /* Set label of an MPLS label stack entry (LSE). */ | |
254 | void | |
255 | set_mpls_lse_label(ovs_be32 *lse, ovs_be32 label) | |
256 | { | |
257 | *lse &= ~htonl(MPLS_LABEL_MASK); | |
258 | *lse |= htonl((ntohl(label) << MPLS_LABEL_SHIFT) & MPLS_LABEL_MASK); | |
259 | } | |
260 | ||
261 | /* Set bottom of stack (BoS) bit of an MPLS label stack entry (LSE). */ | |
262 | void | |
263 | set_mpls_lse_bos(ovs_be32 *lse, uint8_t bos) | |
264 | { | |
265 | *lse &= ~htonl(MPLS_BOS_MASK); | |
266 | *lse |= htonl((bos << MPLS_BOS_SHIFT) & MPLS_BOS_MASK); | |
267 | } | |
268 | ||
269 | /* Compose an MPLS label stack entry (LSE) from its components: | |
270 | * label, traffic class (TC), time to live (TTL) and | |
271 | * bottom of stack (BoS) bit. */ | |
272 | ovs_be32 | |
273 | set_mpls_lse_values(uint8_t ttl, uint8_t tc, uint8_t bos, ovs_be32 label) | |
274 | { | |
275 | ovs_be32 lse = htonl(0); | |
276 | set_mpls_lse_ttl(&lse, ttl); | |
277 | set_mpls_lse_tc(&lse, tc); | |
278 | set_mpls_lse_bos(&lse, bos); | |
279 | set_mpls_lse_label(&lse, label); | |
280 | return lse; | |
281 | } | |
282 | ||
b02475c5 SH |
283 | /* Set MPLS label stack entry to outermost MPLS header.*/ |
284 | void | |
285 | set_mpls_lse(struct ofpbuf *packet, ovs_be32 mpls_lse) | |
286 | { | |
b02475c5 SH |
287 | /* Packet type should be MPLS to set label stack entry. */ |
288 | if (is_mpls(packet)) { | |
6b8c377a | 289 | struct mpls_hdr *mh = ofpbuf_l2_5(packet); |
437d0d22 | 290 | |
b02475c5 | 291 | /* Update mpls label stack entry. */ |
5fa008d4 | 292 | put_16aligned_be32(&mh->mpls_lse, mpls_lse); |
b02475c5 SH |
293 | } |
294 | } | |
295 | ||
296 | /* Push MPLS label stack entry 'lse' onto 'packet' as the the outermost MPLS | |
297 | * header. If 'packet' does not already have any MPLS labels, then its | |
298 | * Ethertype is changed to 'ethtype' (which must be an MPLS Ethertype). */ | |
299 | void | |
300 | push_mpls(struct ofpbuf *packet, ovs_be16 ethtype, ovs_be32 lse) | |
301 | { | |
437d0d22 JR |
302 | char * header; |
303 | size_t len; | |
b02475c5 SH |
304 | |
305 | if (!eth_type_mpls(ethtype)) { | |
306 | return; | |
307 | } | |
308 | ||
309 | if (!is_mpls(packet)) { | |
437d0d22 JR |
310 | /* Set MPLS label stack offset. */ |
311 | packet->l2_5_ofs = packet->l3_ofs; | |
b02475c5 SH |
312 | } |
313 | ||
437d0d22 JR |
314 | set_ethertype(packet, ethtype); |
315 | ||
b02475c5 | 316 | /* Push new MPLS shim header onto packet. */ |
437d0d22 JR |
317 | len = packet->l2_5_ofs; |
318 | header = ofpbuf_resize_l2_5(packet, MPLS_HLEN); | |
319 | memmove(header, header + MPLS_HLEN, len); | |
320 | memcpy(header + len, &lse, sizeof lse); | |
b02475c5 SH |
321 | } |
322 | ||
323 | /* If 'packet' is an MPLS packet, removes its outermost MPLS label stack entry. | |
324 | * If the label that was removed was the only MPLS label, changes 'packet''s | |
325 | * Ethertype to 'ethtype' (which ordinarily should not be an MPLS | |
326 | * Ethertype). */ | |
327 | void | |
328 | pop_mpls(struct ofpbuf *packet, ovs_be16 ethtype) | |
329 | { | |
b02475c5 | 330 | if (is_mpls(packet)) { |
6b8c377a | 331 | struct mpls_hdr *mh = ofpbuf_l2_5(packet); |
437d0d22 JR |
332 | size_t len = packet->l2_5_ofs; |
333 | ||
799a91bb | 334 | set_ethertype(packet, ethtype); |
5fa008d4 | 335 | if (get_16aligned_be32(&mh->mpls_lse) & htonl(MPLS_BOS_MASK)) { |
437d0d22 | 336 | ofpbuf_set_l2_5(packet, NULL); |
b02475c5 SH |
337 | } |
338 | /* Shift the l2 header forward. */ | |
1f317cb5 | 339 | memmove((char*)ofpbuf_data(packet) + MPLS_HLEN, ofpbuf_data(packet), len); |
437d0d22 | 340 | ofpbuf_resize_l2_5(packet, -MPLS_HLEN); |
b02475c5 SH |
341 | } |
342 | } | |
343 | ||
e22f1753 BP |
344 | /* Converts hex digits in 'hex' to an Ethernet packet in '*packetp'. The |
345 | * caller must free '*packetp'. On success, returns NULL. On failure, returns | |
bb622f82 BP |
346 | * an error message and stores NULL in '*packetp'. |
347 | * | |
348 | * Aligns the L3 header of '*packetp' on a 32-bit boundary. */ | |
e22f1753 BP |
349 | const char * |
350 | eth_from_hex(const char *hex, struct ofpbuf **packetp) | |
351 | { | |
352 | struct ofpbuf *packet; | |
353 | ||
bb622f82 BP |
354 | /* Use 2 bytes of headroom to 32-bit align the L3 header. */ |
355 | packet = *packetp = ofpbuf_new_with_headroom(strlen(hex) / 2, 2); | |
e22f1753 BP |
356 | |
357 | if (ofpbuf_put_hex(packet, hex, NULL)[0] != '\0') { | |
358 | ofpbuf_delete(packet); | |
359 | *packetp = NULL; | |
360 | return "Trailing garbage in packet data"; | |
361 | } | |
362 | ||
1f317cb5 | 363 | if (ofpbuf_size(packet) < ETH_HEADER_LEN) { |
e22f1753 BP |
364 | ofpbuf_delete(packet); |
365 | *packetp = NULL; | |
366 | return "Packet data too short for Ethernet"; | |
367 | } | |
368 | ||
369 | return NULL; | |
370 | } | |
371 | ||
3b4d8ad3 JS |
372 | void |
373 | eth_format_masked(const uint8_t eth[ETH_ADDR_LEN], | |
374 | const uint8_t mask[ETH_ADDR_LEN], struct ds *s) | |
375 | { | |
376 | ds_put_format(s, ETH_ADDR_FMT, ETH_ADDR_ARGS(eth)); | |
73c0ce34 | 377 | if (mask && !eth_mask_is_exact(mask)) { |
3b4d8ad3 JS |
378 | ds_put_format(s, "/"ETH_ADDR_FMT, ETH_ADDR_ARGS(mask)); |
379 | } | |
380 | } | |
381 | ||
382 | void | |
383 | eth_addr_bitand(const uint8_t src[ETH_ADDR_LEN], | |
384 | const uint8_t mask[ETH_ADDR_LEN], | |
385 | uint8_t dst[ETH_ADDR_LEN]) | |
386 | { | |
387 | int i; | |
388 | ||
389 | for (i = 0; i < ETH_ADDR_LEN; i++) { | |
390 | dst[i] = src[i] & mask[i]; | |
391 | } | |
392 | } | |
393 | ||
aad29cd1 | 394 | /* Given the IP netmask 'netmask', returns the number of bits of the IP address |
c08201d6 BP |
395 | * that it specifies, that is, the number of 1-bits in 'netmask'. |
396 | * | |
397 | * If 'netmask' is not a CIDR netmask (see ip_is_cidr()), the return value will | |
398 | * still be in the valid range but isn't otherwise meaningful. */ | |
aad29cd1 BP |
399 | int |
400 | ip_count_cidr_bits(ovs_be32 netmask) | |
401 | { | |
d578065e | 402 | return 32 - ctz32(ntohl(netmask)); |
aad29cd1 BP |
403 | } |
404 | ||
405 | void | |
406 | ip_format_masked(ovs_be32 ip, ovs_be32 mask, struct ds *s) | |
407 | { | |
ed36537e | 408 | ds_put_format(s, IP_FMT, IP_ARGS(ip)); |
b8266395 | 409 | if (mask != OVS_BE32_MAX) { |
aad29cd1 BP |
410 | if (ip_is_cidr(mask)) { |
411 | ds_put_format(s, "/%d", ip_count_cidr_bits(mask)); | |
412 | } else { | |
ed36537e | 413 | ds_put_format(s, "/"IP_FMT, IP_ARGS(mask)); |
aad29cd1 BP |
414 | } |
415 | } | |
416 | } | |
417 | ||
418 | ||
d31f1109 JP |
419 | /* Stores the string representation of the IPv6 address 'addr' into the |
420 | * character array 'addr_str', which must be at least INET6_ADDRSTRLEN | |
421 | * bytes long. */ | |
422 | void | |
423 | format_ipv6_addr(char *addr_str, const struct in6_addr *addr) | |
424 | { | |
425 | inet_ntop(AF_INET6, addr, addr_str, INET6_ADDRSTRLEN); | |
426 | } | |
427 | ||
428 | void | |
429 | print_ipv6_addr(struct ds *string, const struct in6_addr *addr) | |
430 | { | |
aad29cd1 BP |
431 | char *dst; |
432 | ||
433 | ds_reserve(string, string->length + INET6_ADDRSTRLEN); | |
434 | ||
435 | dst = string->string + string->length; | |
436 | format_ipv6_addr(dst, addr); | |
437 | string->length += strlen(dst); | |
438 | } | |
d31f1109 | 439 | |
aad29cd1 BP |
440 | void |
441 | print_ipv6_masked(struct ds *s, const struct in6_addr *addr, | |
442 | const struct in6_addr *mask) | |
443 | { | |
444 | print_ipv6_addr(s, addr); | |
445 | if (mask && !ipv6_mask_is_exact(mask)) { | |
446 | if (ipv6_is_cidr(mask)) { | |
447 | int cidr_bits = ipv6_count_cidr_bits(mask); | |
448 | ds_put_format(s, "/%d", cidr_bits); | |
449 | } else { | |
450 | ds_put_char(s, '/'); | |
451 | print_ipv6_addr(s, mask); | |
452 | } | |
453 | } | |
d31f1109 JP |
454 | } |
455 | ||
456 | struct in6_addr ipv6_addr_bitand(const struct in6_addr *a, | |
457 | const struct in6_addr *b) | |
458 | { | |
459 | int i; | |
460 | struct in6_addr dst; | |
461 | ||
462 | #ifdef s6_addr32 | |
463 | for (i=0; i<4; i++) { | |
464 | dst.s6_addr32[i] = a->s6_addr32[i] & b->s6_addr32[i]; | |
465 | } | |
466 | #else | |
467 | for (i=0; i<16; i++) { | |
468 | dst.s6_addr[i] = a->s6_addr[i] & b->s6_addr[i]; | |
469 | } | |
470 | #endif | |
471 | ||
472 | return dst; | |
473 | } | |
474 | ||
475 | /* Returns an in6_addr consisting of 'mask' high-order 1-bits and 128-N | |
476 | * low-order 0-bits. */ | |
477 | struct in6_addr | |
478 | ipv6_create_mask(int mask) | |
479 | { | |
480 | struct in6_addr netmask; | |
481 | uint8_t *netmaskp = &netmask.s6_addr[0]; | |
482 | ||
483 | memset(&netmask, 0, sizeof netmask); | |
484 | while (mask > 8) { | |
485 | *netmaskp = 0xff; | |
486 | netmaskp++; | |
487 | mask -= 8; | |
488 | } | |
489 | ||
490 | if (mask) { | |
491 | *netmaskp = 0xff << (8 - mask); | |
492 | } | |
493 | ||
494 | return netmask; | |
495 | } | |
496 | ||
aad29cd1 BP |
497 | /* Given the IPv6 netmask 'netmask', returns the number of bits of the IPv6 |
498 | * address that it specifies, that is, the number of 1-bits in 'netmask'. | |
ff0b06ee BP |
499 | * 'netmask' must be a CIDR netmask (see ipv6_is_cidr()). |
500 | * | |
501 | * If 'netmask' is not a CIDR netmask (see ipv6_is_cidr()), the return value | |
502 | * will still be in the valid range but isn't otherwise meaningful. */ | |
d31f1109 JP |
503 | int |
504 | ipv6_count_cidr_bits(const struct in6_addr *netmask) | |
505 | { | |
506 | int i; | |
507 | int count = 0; | |
508 | const uint8_t *netmaskp = &netmask->s6_addr[0]; | |
509 | ||
d31f1109 JP |
510 | for (i=0; i<16; i++) { |
511 | if (netmaskp[i] == 0xff) { | |
512 | count += 8; | |
513 | } else { | |
514 | uint8_t nm; | |
515 | ||
516 | for(nm = netmaskp[i]; nm; nm <<= 1) { | |
517 | count++; | |
518 | } | |
519 | break; | |
520 | } | |
521 | ||
522 | } | |
523 | ||
524 | return count; | |
525 | } | |
526 | ||
d31f1109 JP |
527 | /* Returns true if 'netmask' is a CIDR netmask, that is, if it consists of N |
528 | * high-order 1-bits and 128-N low-order 0-bits. */ | |
529 | bool | |
530 | ipv6_is_cidr(const struct in6_addr *netmask) | |
531 | { | |
532 | const uint8_t *netmaskp = &netmask->s6_addr[0]; | |
533 | int i; | |
534 | ||
535 | for (i=0; i<16; i++) { | |
536 | if (netmaskp[i] != 0xff) { | |
537 | uint8_t x = ~netmaskp[i]; | |
538 | if (x & (x + 1)) { | |
539 | return false; | |
540 | } | |
541 | while (++i < 16) { | |
542 | if (netmaskp[i]) { | |
543 | return false; | |
544 | } | |
545 | } | |
546 | } | |
547 | } | |
548 | ||
549 | return true; | |
550 | } | |
c25c91fd | 551 | |
5de1bb5c BP |
552 | /* Populates 'b' with an Ethernet II packet headed with the given 'eth_dst', |
553 | * 'eth_src' and 'eth_type' parameters. A payload of 'size' bytes is allocated | |
554 | * in 'b' and returned. This payload may be populated with appropriate | |
cf3b7538 JR |
555 | * information by the caller. Sets 'b''s 'frame' pointer and 'l3' offset to |
556 | * the Ethernet header and payload respectively. Aligns b->l3 on a 32-bit | |
bb622f82 | 557 | * boundary. |
eda1f38d BP |
558 | * |
559 | * The returned packet has enough headroom to insert an 802.1Q VLAN header if | |
560 | * desired. */ | |
40f78b38 | 561 | void * |
5de1bb5c BP |
562 | eth_compose(struct ofpbuf *b, const uint8_t eth_dst[ETH_ADDR_LEN], |
563 | const uint8_t eth_src[ETH_ADDR_LEN], uint16_t eth_type, | |
564 | size_t size) | |
c25c91fd | 565 | { |
40f78b38 | 566 | void *data; |
c25c91fd | 567 | struct eth_header *eth; |
c25c91fd EJ |
568 | |
569 | ofpbuf_clear(b); | |
570 | ||
bb622f82 BP |
571 | /* The magic 2 here ensures that the L3 header (when it is added later) |
572 | * will be 32-bit aligned. */ | |
573 | ofpbuf_prealloc_tailroom(b, 2 + ETH_HEADER_LEN + VLAN_HEADER_LEN + size); | |
574 | ofpbuf_reserve(b, 2 + VLAN_HEADER_LEN); | |
40f78b38 EJ |
575 | eth = ofpbuf_put_uninit(b, ETH_HEADER_LEN); |
576 | data = ofpbuf_put_uninit(b, size); | |
c25c91fd | 577 | |
40f78b38 | 578 | memcpy(eth->eth_dst, eth_dst, ETH_ADDR_LEN); |
c25c91fd | 579 | memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN); |
40f78b38 EJ |
580 | eth->eth_type = htons(eth_type); |
581 | ||
cf3b7538 | 582 | ofpbuf_set_frame(b, eth); |
437d0d22 | 583 | ofpbuf_set_l3(b, data); |
75a4ead1 | 584 | |
40f78b38 | 585 | return data; |
07a6cf77 EJ |
586 | } |
587 | ||
c97664b3 | 588 | static void |
7c457c33 BP |
589 | packet_set_ipv4_addr(struct ofpbuf *packet, |
590 | ovs_16aligned_be32 *addr, ovs_be32 new_addr) | |
c97664b3 | 591 | { |
6b8c377a | 592 | struct ip_header *nh = ofpbuf_l3(packet); |
7c457c33 | 593 | ovs_be32 old_addr = get_16aligned_be32(addr); |
6b8c377a | 594 | size_t l4_size = ofpbuf_l4_size(packet); |
c97664b3 | 595 | |
5a51b2cd | 596 | if (nh->ip_proto == IPPROTO_TCP && l4_size >= TCP_HEADER_LEN) { |
6b8c377a | 597 | struct tcp_header *th = ofpbuf_l4(packet); |
c97664b3 | 598 | |
7c457c33 | 599 | th->tcp_csum = recalc_csum32(th->tcp_csum, old_addr, new_addr); |
5a51b2cd | 600 | } else if (nh->ip_proto == IPPROTO_UDP && l4_size >= UDP_HEADER_LEN ) { |
6b8c377a | 601 | struct udp_header *uh = ofpbuf_l4(packet); |
c97664b3 EJ |
602 | |
603 | if (uh->udp_csum) { | |
7c457c33 | 604 | uh->udp_csum = recalc_csum32(uh->udp_csum, old_addr, new_addr); |
c97664b3 EJ |
605 | if (!uh->udp_csum) { |
606 | uh->udp_csum = htons(0xffff); | |
607 | } | |
608 | } | |
609 | } | |
7c457c33 BP |
610 | nh->ip_csum = recalc_csum32(nh->ip_csum, old_addr, new_addr); |
611 | put_16aligned_be32(addr, new_addr); | |
c97664b3 EJ |
612 | } |
613 | ||
bc7a5acd AA |
614 | /* Returns true, if packet contains at least one routing header where |
615 | * segements_left > 0. | |
616 | * | |
437d0d22 | 617 | * This function assumes that L3 and L4 offsets are set in the packet. */ |
bc7a5acd AA |
618 | static bool |
619 | packet_rh_present(struct ofpbuf *packet) | |
620 | { | |
4528f34f | 621 | const struct ovs_16aligned_ip6_hdr *nh; |
bc7a5acd AA |
622 | int nexthdr; |
623 | size_t len; | |
624 | size_t remaining; | |
6b8c377a | 625 | uint8_t *data = ofpbuf_l3(packet); |
bc7a5acd | 626 | |
437d0d22 | 627 | remaining = packet->l4_ofs - packet->l3_ofs; |
bc7a5acd AA |
628 | |
629 | if (remaining < sizeof *nh) { | |
630 | return false; | |
631 | } | |
4528f34f | 632 | nh = ALIGNED_CAST(struct ovs_16aligned_ip6_hdr *, data); |
bc7a5acd AA |
633 | data += sizeof *nh; |
634 | remaining -= sizeof *nh; | |
635 | nexthdr = nh->ip6_nxt; | |
636 | ||
637 | while (1) { | |
638 | if ((nexthdr != IPPROTO_HOPOPTS) | |
639 | && (nexthdr != IPPROTO_ROUTING) | |
640 | && (nexthdr != IPPROTO_DSTOPTS) | |
641 | && (nexthdr != IPPROTO_AH) | |
642 | && (nexthdr != IPPROTO_FRAGMENT)) { | |
643 | /* It's either a terminal header (e.g., TCP, UDP) or one we | |
644 | * don't understand. In either case, we're done with the | |
645 | * packet, so use it to fill in 'nw_proto'. */ | |
646 | break; | |
647 | } | |
648 | ||
649 | /* We only verify that at least 8 bytes of the next header are | |
650 | * available, but many of these headers are longer. Ensure that | |
651 | * accesses within the extension header are within those first 8 | |
652 | * bytes. All extension headers are required to be at least 8 | |
653 | * bytes. */ | |
654 | if (remaining < 8) { | |
655 | return false; | |
656 | } | |
657 | ||
658 | if (nexthdr == IPPROTO_AH) { | |
659 | /* A standard AH definition isn't available, but the fields | |
660 | * we care about are in the same location as the generic | |
661 | * option header--only the header length is calculated | |
662 | * differently. */ | |
663 | const struct ip6_ext *ext_hdr = (struct ip6_ext *)data; | |
664 | ||
665 | nexthdr = ext_hdr->ip6e_nxt; | |
666 | len = (ext_hdr->ip6e_len + 2) * 4; | |
667 | } else if (nexthdr == IPPROTO_FRAGMENT) { | |
4528f34f BP |
668 | const struct ovs_16aligned_ip6_frag *frag_hdr |
669 | = ALIGNED_CAST(struct ovs_16aligned_ip6_frag *, data); | |
bc7a5acd AA |
670 | |
671 | nexthdr = frag_hdr->ip6f_nxt; | |
672 | len = sizeof *frag_hdr; | |
673 | } else if (nexthdr == IPPROTO_ROUTING) { | |
674 | const struct ip6_rthdr *rh = (struct ip6_rthdr *)data; | |
675 | ||
676 | if (rh->ip6r_segleft > 0) { | |
677 | return true; | |
678 | } | |
679 | ||
680 | nexthdr = rh->ip6r_nxt; | |
681 | len = (rh->ip6r_len + 1) * 8; | |
682 | } else { | |
683 | const struct ip6_ext *ext_hdr = (struct ip6_ext *)data; | |
684 | ||
685 | nexthdr = ext_hdr->ip6e_nxt; | |
686 | len = (ext_hdr->ip6e_len + 1) * 8; | |
687 | } | |
688 | ||
689 | if (remaining < len) { | |
690 | return false; | |
691 | } | |
692 | remaining -= len; | |
693 | data += len; | |
694 | } | |
695 | ||
696 | return false; | |
697 | } | |
698 | ||
699 | static void | |
700 | packet_update_csum128(struct ofpbuf *packet, uint8_t proto, | |
4528f34f | 701 | ovs_16aligned_be32 addr[4], const ovs_be32 new_addr[4]) |
bc7a5acd | 702 | { |
6b8c377a | 703 | size_t l4_size = ofpbuf_l4_size(packet); |
5a51b2cd JR |
704 | |
705 | if (proto == IPPROTO_TCP && l4_size >= TCP_HEADER_LEN) { | |
6b8c377a | 706 | struct tcp_header *th = ofpbuf_l4(packet); |
bc7a5acd AA |
707 | |
708 | th->tcp_csum = recalc_csum128(th->tcp_csum, addr, new_addr); | |
5a51b2cd | 709 | } else if (proto == IPPROTO_UDP && l4_size >= UDP_HEADER_LEN) { |
6b8c377a | 710 | struct udp_header *uh = ofpbuf_l4(packet); |
bc7a5acd AA |
711 | |
712 | if (uh->udp_csum) { | |
713 | uh->udp_csum = recalc_csum128(uh->udp_csum, addr, new_addr); | |
714 | if (!uh->udp_csum) { | |
715 | uh->udp_csum = htons(0xffff); | |
716 | } | |
717 | } | |
00894212 JG |
718 | } else if (proto == IPPROTO_ICMPV6 && l4_size >= sizeof(struct icmp6_hdr)) { |
719 | struct icmp6_hdr *icmp = ofpbuf_l4(packet); | |
720 | ||
721 | icmp->icmp6_cksum = recalc_csum128(icmp->icmp6_cksum, addr, new_addr); | |
bc7a5acd AA |
722 | } |
723 | } | |
724 | ||
725 | static void | |
726 | packet_set_ipv6_addr(struct ofpbuf *packet, uint8_t proto, | |
4068403a | 727 | ovs_16aligned_be32 addr[4], const ovs_be32 new_addr[4], |
bc7a5acd AA |
728 | bool recalculate_csum) |
729 | { | |
730 | if (recalculate_csum) { | |
4528f34f | 731 | packet_update_csum128(packet, proto, addr, new_addr); |
bc7a5acd | 732 | } |
4068403a | 733 | memcpy(addr, new_addr, sizeof(ovs_be32[4])); |
bc7a5acd AA |
734 | } |
735 | ||
736 | static void | |
4528f34f | 737 | packet_set_ipv6_flow_label(ovs_16aligned_be32 *flow_label, ovs_be32 flow_key) |
bc7a5acd | 738 | { |
4528f34f BP |
739 | ovs_be32 old_label = get_16aligned_be32(flow_label); |
740 | ovs_be32 new_label = (old_label & htonl(~IPV6_LABEL_MASK)) | flow_key; | |
741 | put_16aligned_be32(flow_label, new_label); | |
bc7a5acd AA |
742 | } |
743 | ||
744 | static void | |
4528f34f | 745 | packet_set_ipv6_tc(ovs_16aligned_be32 *flow_label, uint8_t tc) |
bc7a5acd | 746 | { |
4528f34f BP |
747 | ovs_be32 old_label = get_16aligned_be32(flow_label); |
748 | ovs_be32 new_label = (old_label & htonl(0xF00FFFFF)) | htonl(tc << 20); | |
749 | put_16aligned_be32(flow_label, new_label); | |
bc7a5acd AA |
750 | } |
751 | ||
c97664b3 EJ |
752 | /* Modifies the IPv4 header fields of 'packet' to be consistent with 'src', |
753 | * 'dst', 'tos', and 'ttl'. Updates 'packet''s L4 checksums as appropriate. | |
754 | * 'packet' must contain a valid IPv4 packet with correctly populated l[347] | |
755 | * markers. */ | |
756 | void | |
757 | packet_set_ipv4(struct ofpbuf *packet, ovs_be32 src, ovs_be32 dst, | |
758 | uint8_t tos, uint8_t ttl) | |
759 | { | |
6b8c377a | 760 | struct ip_header *nh = ofpbuf_l3(packet); |
c97664b3 | 761 | |
7c457c33 | 762 | if (get_16aligned_be32(&nh->ip_src) != src) { |
c97664b3 EJ |
763 | packet_set_ipv4_addr(packet, &nh->ip_src, src); |
764 | } | |
765 | ||
7c457c33 | 766 | if (get_16aligned_be32(&nh->ip_dst) != dst) { |
c97664b3 EJ |
767 | packet_set_ipv4_addr(packet, &nh->ip_dst, dst); |
768 | } | |
769 | ||
770 | if (nh->ip_tos != tos) { | |
771 | uint8_t *field = &nh->ip_tos; | |
772 | ||
773 | nh->ip_csum = recalc_csum16(nh->ip_csum, htons((uint16_t) *field), | |
774 | htons((uint16_t) tos)); | |
775 | *field = tos; | |
776 | } | |
777 | ||
778 | if (nh->ip_ttl != ttl) { | |
779 | uint8_t *field = &nh->ip_ttl; | |
780 | ||
781 | nh->ip_csum = recalc_csum16(nh->ip_csum, htons(*field << 8), | |
782 | htons(ttl << 8)); | |
783 | *field = ttl; | |
784 | } | |
785 | } | |
786 | ||
bc7a5acd AA |
787 | /* Modifies the IPv6 header fields of 'packet' to be consistent with 'src', |
788 | * 'dst', 'traffic class', and 'next hop'. Updates 'packet''s L4 checksums as | |
789 | * appropriate. 'packet' must contain a valid IPv6 packet with correctly | |
437d0d22 | 790 | * populated l[34] offsets. */ |
bc7a5acd AA |
791 | void |
792 | packet_set_ipv6(struct ofpbuf *packet, uint8_t proto, const ovs_be32 src[4], | |
793 | const ovs_be32 dst[4], uint8_t key_tc, ovs_be32 key_fl, | |
794 | uint8_t key_hl) | |
795 | { | |
6b8c377a | 796 | struct ovs_16aligned_ip6_hdr *nh = ofpbuf_l3(packet); |
bc7a5acd AA |
797 | |
798 | if (memcmp(&nh->ip6_src, src, sizeof(ovs_be32[4]))) { | |
4528f34f | 799 | packet_set_ipv6_addr(packet, proto, nh->ip6_src.be32, src, true); |
bc7a5acd AA |
800 | } |
801 | ||
802 | if (memcmp(&nh->ip6_dst, dst, sizeof(ovs_be32[4]))) { | |
4528f34f | 803 | packet_set_ipv6_addr(packet, proto, nh->ip6_dst.be32, dst, |
bc7a5acd AA |
804 | !packet_rh_present(packet)); |
805 | } | |
806 | ||
807 | packet_set_ipv6_tc(&nh->ip6_flow, key_tc); | |
808 | ||
809 | packet_set_ipv6_flow_label(&nh->ip6_flow, key_fl); | |
810 | ||
811 | nh->ip6_hlim = key_hl; | |
812 | } | |
813 | ||
c97664b3 EJ |
814 | static void |
815 | packet_set_port(ovs_be16 *port, ovs_be16 new_port, ovs_be16 *csum) | |
816 | { | |
817 | if (*port != new_port) { | |
818 | *csum = recalc_csum16(*csum, *port, new_port); | |
819 | *port = new_port; | |
820 | } | |
821 | } | |
822 | ||
823 | /* Sets the TCP source and destination port ('src' and 'dst' respectively) of | |
824 | * the TCP header contained in 'packet'. 'packet' must be a valid TCP packet | |
437d0d22 | 825 | * with its l4 offset properly populated. */ |
c97664b3 EJ |
826 | void |
827 | packet_set_tcp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst) | |
828 | { | |
6b8c377a | 829 | struct tcp_header *th = ofpbuf_l4(packet); |
c97664b3 EJ |
830 | |
831 | packet_set_port(&th->tcp_src, src, &th->tcp_csum); | |
832 | packet_set_port(&th->tcp_dst, dst, &th->tcp_csum); | |
833 | } | |
834 | ||
835 | /* Sets the UDP source and destination port ('src' and 'dst' respectively) of | |
836 | * the UDP header contained in 'packet'. 'packet' must be a valid UDP packet | |
437d0d22 | 837 | * with its l4 offset properly populated. */ |
c97664b3 EJ |
838 | void |
839 | packet_set_udp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst) | |
840 | { | |
6b8c377a | 841 | struct udp_header *uh = ofpbuf_l4(packet); |
c97664b3 EJ |
842 | |
843 | if (uh->udp_csum) { | |
844 | packet_set_port(&uh->udp_src, src, &uh->udp_csum); | |
845 | packet_set_port(&uh->udp_dst, dst, &uh->udp_csum); | |
846 | ||
847 | if (!uh->udp_csum) { | |
848 | uh->udp_csum = htons(0xffff); | |
849 | } | |
850 | } else { | |
851 | uh->udp_src = src; | |
852 | uh->udp_dst = dst; | |
853 | } | |
854 | } | |
12113c39 | 855 | |
c6bcb685 JS |
856 | /* Sets the SCTP source and destination port ('src' and 'dst' respectively) of |
857 | * the SCTP header contained in 'packet'. 'packet' must be a valid SCTP packet | |
437d0d22 | 858 | * with its l4 offset properly populated. */ |
c6bcb685 JS |
859 | void |
860 | packet_set_sctp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst) | |
861 | { | |
6b8c377a | 862 | struct sctp_header *sh = ofpbuf_l4(packet); |
c6bcb685 | 863 | ovs_be32 old_csum, old_correct_csum, new_csum; |
cf3b7538 | 864 | uint16_t tp_len = ofpbuf_l4_size(packet); |
c6bcb685 | 865 | |
5fa008d4 BP |
866 | old_csum = get_16aligned_be32(&sh->sctp_csum); |
867 | put_16aligned_be32(&sh->sctp_csum, 0); | |
437d0d22 | 868 | old_correct_csum = crc32c((void *)sh, tp_len); |
c6bcb685 JS |
869 | |
870 | sh->sctp_src = src; | |
871 | sh->sctp_dst = dst; | |
872 | ||
437d0d22 | 873 | new_csum = crc32c((void *)sh, tp_len); |
5fa008d4 | 874 | put_16aligned_be32(&sh->sctp_csum, old_csum ^ old_correct_csum ^ new_csum); |
c6bcb685 JS |
875 | } |
876 | ||
61bf6666 JR |
877 | const char * |
878 | packet_tcp_flag_to_string(uint32_t flag) | |
879 | { | |
880 | switch (flag) { | |
881 | case TCP_FIN: | |
882 | return "fin"; | |
883 | case TCP_SYN: | |
884 | return "syn"; | |
885 | case TCP_RST: | |
886 | return "rst"; | |
887 | case TCP_PSH: | |
888 | return "psh"; | |
889 | case TCP_ACK: | |
890 | return "ack"; | |
891 | case TCP_URG: | |
892 | return "urg"; | |
893 | case TCP_ECE: | |
894 | return "ece"; | |
895 | case TCP_CWR: | |
896 | return "cwr"; | |
897 | case TCP_NS: | |
898 | return "ns"; | |
899 | case 0x200: | |
900 | return "[200]"; | |
901 | case 0x400: | |
902 | return "[400]"; | |
903 | case 0x800: | |
904 | return "[800]"; | |
905 | default: | |
906 | return NULL; | |
907 | } | |
908 | } | |
909 | ||
7393104d | 910 | /* Appends a string representation of the TCP flags value 'tcp_flags' |
f41b5b3b | 911 | * (e.g. from struct flow.tcp_flags or obtained via TCP_FLAGS) to 's', in the |
7393104d BP |
912 | * format used by tcpdump. */ |
913 | void | |
a66733a8 | 914 | packet_format_tcp_flags(struct ds *s, uint16_t tcp_flags) |
7393104d BP |
915 | { |
916 | if (!tcp_flags) { | |
917 | ds_put_cstr(s, "none"); | |
918 | return; | |
919 | } | |
920 | ||
921 | if (tcp_flags & TCP_SYN) { | |
922 | ds_put_char(s, 'S'); | |
923 | } | |
924 | if (tcp_flags & TCP_FIN) { | |
925 | ds_put_char(s, 'F'); | |
926 | } | |
927 | if (tcp_flags & TCP_PSH) { | |
928 | ds_put_char(s, 'P'); | |
929 | } | |
930 | if (tcp_flags & TCP_RST) { | |
931 | ds_put_char(s, 'R'); | |
932 | } | |
933 | if (tcp_flags & TCP_URG) { | |
934 | ds_put_char(s, 'U'); | |
935 | } | |
936 | if (tcp_flags & TCP_ACK) { | |
937 | ds_put_char(s, '.'); | |
938 | } | |
a66733a8 JR |
939 | if (tcp_flags & TCP_ECE) { |
940 | ds_put_cstr(s, "E"); | |
7393104d | 941 | } |
a66733a8 JR |
942 | if (tcp_flags & TCP_CWR) { |
943 | ds_put_cstr(s, "C"); | |
944 | } | |
945 | if (tcp_flags & TCP_NS) { | |
946 | ds_put_cstr(s, "N"); | |
947 | } | |
948 | if (tcp_flags & 0x200) { | |
949 | ds_put_cstr(s, "[200]"); | |
950 | } | |
951 | if (tcp_flags & 0x400) { | |
952 | ds_put_cstr(s, "[400]"); | |
953 | } | |
954 | if (tcp_flags & 0x800) { | |
955 | ds_put_cstr(s, "[800]"); | |
7393104d BP |
956 | } |
957 | } |