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b9e8b45a | 1 | /* |
eb0b295e | 2 | * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015 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" |
8c45d00f | 31 | #include "ovs-thread.h" |
b5e7e61a | 32 | #include "odp-util.h" |
cf62fa4c | 33 | #include "dp-packet.h" |
7c457c33 | 34 | #include "unaligned.h" |
b9e8b45a | 35 | |
d31f1109 | 36 | const struct in6_addr in6addr_exact = IN6ADDR_EXACT_INIT; |
06994f87 | 37 | const struct in6_addr in6addr_all_hosts = IN6ADDR_ALL_HOSTS_INIT; |
d31f1109 | 38 | |
093ca5b3 BP |
39 | /* Parses 's' as a 16-digit hexadecimal number representing a datapath ID. On |
40 | * success stores the dpid into '*dpidp' and returns true, on failure stores 0 | |
41 | * into '*dpidp' and returns false. | |
42 | * | |
43 | * Rejects an all-zeros dpid as invalid. */ | |
76343538 BP |
44 | bool |
45 | dpid_from_string(const char *s, uint64_t *dpidp) | |
46 | { | |
b123cc3c | 47 | *dpidp = (strlen(s) == 16 && strspn(s, "0123456789abcdefABCDEF") == 16 |
093ca5b3 | 48 | ? strtoull(s, NULL, 16) |
76343538 BP |
49 | : 0); |
50 | return *dpidp != 0; | |
51 | } | |
52 | ||
7d48a4cc BP |
53 | /* Returns true if 'ea' is a reserved address, that a bridge must never |
54 | * forward, false otherwise. | |
05be4e2c EJ |
55 | * |
56 | * If you change this function's behavior, please update corresponding | |
57 | * documentation in vswitch.xml at the same time. */ | |
58 | bool | |
59 | eth_addr_is_reserved(const uint8_t ea[ETH_ADDR_LEN]) | |
60 | { | |
7d48a4cc BP |
61 | struct eth_addr_node { |
62 | struct hmap_node hmap_node; | |
8c45d00f | 63 | const uint64_t ea64; |
05be4e2c EJ |
64 | }; |
65 | ||
7d48a4cc BP |
66 | static struct eth_addr_node nodes[] = { |
67 | /* STP, IEEE pause frames, and other reserved protocols. */ | |
f0ac9da9 BP |
68 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000000ULL }, |
69 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000001ULL }, | |
70 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000002ULL }, | |
71 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000003ULL }, | |
72 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000004ULL }, | |
73 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000005ULL }, | |
74 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000006ULL }, | |
75 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000007ULL }, | |
76 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000008ULL }, | |
77 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000009ULL }, | |
78 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000aULL }, | |
79 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000bULL }, | |
80 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000cULL }, | |
81 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000dULL }, | |
82 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000eULL }, | |
83 | { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000fULL }, | |
7d48a4cc BP |
84 | |
85 | /* Extreme protocols. */ | |
86 | { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000000ULL }, /* EDP. */ | |
87 | { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000004ULL }, /* EAPS. */ | |
88 | { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000006ULL }, /* EAPS. */ | |
89 | ||
90 | /* Cisco protocols. */ | |
91 | { HMAP_NODE_NULL_INITIALIZER, 0x01000c000000ULL }, /* ISL. */ | |
92 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccccULL }, /* PAgP, UDLD, CDP, | |
93 | * DTP, VTP. */ | |
94 | { HMAP_NODE_NULL_INITIALIZER, 0x01000ccccccdULL }, /* PVST+. */ | |
95 | { HMAP_NODE_NULL_INITIALIZER, 0x01000ccdcdcdULL }, /* STP Uplink Fast, | |
96 | * FlexLink. */ | |
97 | ||
98 | /* Cisco CFM. */ | |
99 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc0ULL }, | |
100 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc1ULL }, | |
101 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc2ULL }, | |
102 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc3ULL }, | |
103 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc4ULL }, | |
104 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc5ULL }, | |
105 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc6ULL }, | |
106 | { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc7ULL }, | |
107 | }; | |
05be4e2c | 108 | |
8c45d00f | 109 | static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER; |
7d48a4cc | 110 | struct eth_addr_node *node; |
8c45d00f | 111 | static struct hmap addrs; |
7d48a4cc | 112 | uint64_t ea64; |
05be4e2c | 113 | |
8c45d00f BP |
114 | if (ovsthread_once_start(&once)) { |
115 | hmap_init(&addrs); | |
7d48a4cc | 116 | for (node = nodes; node < &nodes[ARRAY_SIZE(nodes)]; node++) { |
965607c8 | 117 | hmap_insert(&addrs, &node->hmap_node, hash_uint64(node->ea64)); |
7d48a4cc | 118 | } |
8c45d00f | 119 | ovsthread_once_done(&once); |
7d48a4cc | 120 | } |
05be4e2c | 121 | |
7d48a4cc | 122 | ea64 = eth_addr_to_uint64(ea); |
965607c8 | 123 | HMAP_FOR_EACH_IN_BUCKET (node, hmap_node, hash_uint64(ea64), &addrs) { |
7d48a4cc | 124 | if (node->ea64 == ea64) { |
05be4e2c EJ |
125 | return true; |
126 | } | |
127 | } | |
128 | return false; | |
129 | } | |
130 | ||
76343538 BP |
131 | bool |
132 | eth_addr_from_string(const char *s, uint8_t ea[ETH_ADDR_LEN]) | |
133 | { | |
c2c28dfd | 134 | if (ovs_scan(s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(ea))) { |
76343538 BP |
135 | return true; |
136 | } else { | |
137 | memset(ea, 0, ETH_ADDR_LEN); | |
138 | return false; | |
139 | } | |
140 | } | |
141 | ||
38f7147c | 142 | /* Fills 'b' with a Reverse ARP packet with Ethernet source address 'eth_src'. |
b9e8b45a | 143 | * This function is used by Open vSwitch to compose packets in cases where |
38f7147c EJ |
144 | * context is important but content doesn't (or shouldn't) matter. |
145 | * | |
146 | * The returned packet has enough headroom to insert an 802.1Q VLAN header if | |
147 | * desired. */ | |
b9e8b45a | 148 | void |
cf62fa4c | 149 | compose_rarp(struct dp_packet *b, const uint8_t eth_src[ETH_ADDR_LEN]) |
b9e8b45a | 150 | { |
38f7147c | 151 | struct eth_header *eth; |
7cb57d10 | 152 | struct arp_eth_header *arp; |
b9e8b45a | 153 | |
cf62fa4c PS |
154 | dp_packet_clear(b); |
155 | dp_packet_prealloc_tailroom(b, 2 + ETH_HEADER_LEN + VLAN_HEADER_LEN | |
7cb57d10 | 156 | + ARP_ETH_HEADER_LEN); |
cf62fa4c PS |
157 | dp_packet_reserve(b, 2 + VLAN_HEADER_LEN); |
158 | eth = dp_packet_put_uninit(b, sizeof *eth); | |
38f7147c EJ |
159 | memcpy(eth->eth_dst, eth_addr_broadcast, ETH_ADDR_LEN); |
160 | memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN); | |
161 | eth->eth_type = htons(ETH_TYPE_RARP); | |
162 | ||
cf62fa4c | 163 | arp = dp_packet_put_uninit(b, sizeof *arp); |
7cb57d10 EJ |
164 | arp->ar_hrd = htons(ARP_HRD_ETHERNET); |
165 | arp->ar_pro = htons(ARP_PRO_IP); | |
166 | arp->ar_hln = sizeof arp->ar_sha; | |
167 | arp->ar_pln = sizeof arp->ar_spa; | |
168 | arp->ar_op = htons(ARP_OP_RARP); | |
169 | memcpy(arp->ar_sha, eth_src, ETH_ADDR_LEN); | |
7c457c33 | 170 | put_16aligned_be32(&arp->ar_spa, htonl(0)); |
7cb57d10 | 171 | memcpy(arp->ar_tha, eth_src, ETH_ADDR_LEN); |
7c457c33 | 172 | put_16aligned_be32(&arp->ar_tpa, htonl(0)); |
cf3b7538 | 173 | |
82eb5b0a | 174 | dp_packet_reset_offsets(b); |
cf62fa4c | 175 | dp_packet_set_l3(b, arp); |
b9e8b45a | 176 | } |
d31f1109 | 177 | |
d9065a90 | 178 | /* Insert VLAN header according to given TCI. Packet passed must be Ethernet |
2f4ca41b | 179 | * packet. Ignores the CFI bit of 'tci' using 0 instead. |
7c66b273 | 180 | * |
cf3b7538 | 181 | * Also adjusts the layer offsets accordingly. */ |
7c66b273 | 182 | void |
cf62fa4c | 183 | eth_push_vlan(struct dp_packet *packet, ovs_be16 tpid, ovs_be16 tci) |
7c66b273 | 184 | { |
7c66b273 BP |
185 | struct vlan_eth_header *veh; |
186 | ||
d9065a90 | 187 | /* Insert new 802.1Q header. */ |
cf62fa4c | 188 | veh = dp_packet_resize_l2(packet, VLAN_HEADER_LEN); |
437d0d22 JR |
189 | memmove(veh, (char *)veh + VLAN_HEADER_LEN, 2 * ETH_ADDR_LEN); |
190 | veh->veth_type = tpid; | |
191 | veh->veth_tci = tci & htons(~VLAN_CFI); | |
7c66b273 BP |
192 | } |
193 | ||
f4ebc25e BP |
194 | /* Removes outermost VLAN header (if any is present) from 'packet'. |
195 | * | |
d6943394 TH |
196 | * 'packet->l2_5' should initially point to 'packet''s outer-most VLAN header |
197 | * or may be NULL if there are no VLAN headers. */ | |
f4ebc25e | 198 | void |
cf62fa4c | 199 | eth_pop_vlan(struct dp_packet *packet) |
f4ebc25e | 200 | { |
cf62fa4c | 201 | struct vlan_eth_header *veh = dp_packet_l2(packet); |
437d0d22 | 202 | |
cf62fa4c | 203 | if (veh && dp_packet_size(packet) >= sizeof *veh |
d6943394 | 204 | && eth_type_vlan(veh->veth_type)) { |
f4ebc25e | 205 | |
437d0d22 | 206 | memmove((char *)veh + VLAN_HEADER_LEN, veh, 2 * ETH_ADDR_LEN); |
cf62fa4c | 207 | dp_packet_resize_l2(packet, -VLAN_HEADER_LEN); |
f4ebc25e BP |
208 | } |
209 | } | |
210 | ||
b02475c5 | 211 | /* Set ethertype of the packet. */ |
56b02633 | 212 | static void |
cf62fa4c | 213 | set_ethertype(struct dp_packet *packet, ovs_be16 eth_type) |
b02475c5 | 214 | { |
cf62fa4c | 215 | struct eth_header *eh = dp_packet_l2(packet); |
cf3b7538 JR |
216 | |
217 | if (!eh) { | |
218 | return; | |
219 | } | |
b02475c5 | 220 | |
d6943394 | 221 | if (eth_type_vlan(eh->eth_type)) { |
b02475c5 | 222 | ovs_be16 *p; |
cf62fa4c | 223 | char *l2_5 = dp_packet_l2_5(packet); |
437d0d22 | 224 | |
db5a1019 | 225 | p = ALIGNED_CAST(ovs_be16 *, |
cf62fa4c | 226 | (l2_5 ? l2_5 : (char *)dp_packet_l3(packet)) - 2); |
b02475c5 SH |
227 | *p = eth_type; |
228 | } else { | |
229 | eh->eth_type = eth_type; | |
230 | } | |
231 | } | |
232 | ||
cf62fa4c | 233 | static bool is_mpls(struct dp_packet *packet) |
b02475c5 | 234 | { |
437d0d22 | 235 | return packet->l2_5_ofs != UINT16_MAX; |
b02475c5 SH |
236 | } |
237 | ||
238 | /* Set time to live (TTL) of an MPLS label stack entry (LSE). */ | |
b676167a | 239 | void |
b02475c5 SH |
240 | set_mpls_lse_ttl(ovs_be32 *lse, uint8_t ttl) |
241 | { | |
242 | *lse &= ~htonl(MPLS_TTL_MASK); | |
243 | *lse |= htonl((ttl << MPLS_TTL_SHIFT) & MPLS_TTL_MASK); | |
244 | } | |
245 | ||
246 | /* Set traffic class (TC) of an MPLS label stack entry (LSE). */ | |
247 | void | |
248 | set_mpls_lse_tc(ovs_be32 *lse, uint8_t tc) | |
249 | { | |
250 | *lse &= ~htonl(MPLS_TC_MASK); | |
251 | *lse |= htonl((tc << MPLS_TC_SHIFT) & MPLS_TC_MASK); | |
252 | } | |
253 | ||
254 | /* Set label of an MPLS label stack entry (LSE). */ | |
255 | void | |
256 | set_mpls_lse_label(ovs_be32 *lse, ovs_be32 label) | |
257 | { | |
258 | *lse &= ~htonl(MPLS_LABEL_MASK); | |
259 | *lse |= htonl((ntohl(label) << MPLS_LABEL_SHIFT) & MPLS_LABEL_MASK); | |
260 | } | |
261 | ||
262 | /* Set bottom of stack (BoS) bit of an MPLS label stack entry (LSE). */ | |
263 | void | |
264 | set_mpls_lse_bos(ovs_be32 *lse, uint8_t bos) | |
265 | { | |
266 | *lse &= ~htonl(MPLS_BOS_MASK); | |
267 | *lse |= htonl((bos << MPLS_BOS_SHIFT) & MPLS_BOS_MASK); | |
268 | } | |
269 | ||
270 | /* Compose an MPLS label stack entry (LSE) from its components: | |
271 | * label, traffic class (TC), time to live (TTL) and | |
272 | * bottom of stack (BoS) bit. */ | |
273 | ovs_be32 | |
274 | set_mpls_lse_values(uint8_t ttl, uint8_t tc, uint8_t bos, ovs_be32 label) | |
275 | { | |
276 | ovs_be32 lse = htonl(0); | |
277 | set_mpls_lse_ttl(&lse, ttl); | |
278 | set_mpls_lse_tc(&lse, tc); | |
279 | set_mpls_lse_bos(&lse, bos); | |
280 | set_mpls_lse_label(&lse, label); | |
281 | return lse; | |
282 | } | |
283 | ||
b02475c5 SH |
284 | /* Set MPLS label stack entry to outermost MPLS header.*/ |
285 | void | |
cf62fa4c | 286 | set_mpls_lse(struct dp_packet *packet, ovs_be32 mpls_lse) |
b02475c5 | 287 | { |
b02475c5 SH |
288 | /* Packet type should be MPLS to set label stack entry. */ |
289 | if (is_mpls(packet)) { | |
cf62fa4c | 290 | struct mpls_hdr *mh = dp_packet_l2_5(packet); |
437d0d22 | 291 | |
b02475c5 | 292 | /* Update mpls label stack entry. */ |
5fa008d4 | 293 | put_16aligned_be32(&mh->mpls_lse, mpls_lse); |
b02475c5 SH |
294 | } |
295 | } | |
296 | ||
297 | /* Push MPLS label stack entry 'lse' onto 'packet' as the the outermost MPLS | |
298 | * header. If 'packet' does not already have any MPLS labels, then its | |
299 | * Ethertype is changed to 'ethtype' (which must be an MPLS Ethertype). */ | |
300 | void | |
cf62fa4c | 301 | push_mpls(struct dp_packet *packet, ovs_be16 ethtype, ovs_be32 lse) |
b02475c5 | 302 | { |
437d0d22 JR |
303 | char * header; |
304 | size_t len; | |
b02475c5 SH |
305 | |
306 | if (!eth_type_mpls(ethtype)) { | |
307 | return; | |
308 | } | |
309 | ||
310 | if (!is_mpls(packet)) { | |
437d0d22 JR |
311 | /* Set MPLS label stack offset. */ |
312 | packet->l2_5_ofs = packet->l3_ofs; | |
b02475c5 SH |
313 | } |
314 | ||
437d0d22 JR |
315 | set_ethertype(packet, ethtype); |
316 | ||
b02475c5 | 317 | /* Push new MPLS shim header onto packet. */ |
437d0d22 | 318 | len = packet->l2_5_ofs; |
cf62fa4c | 319 | header = dp_packet_resize_l2_5(packet, MPLS_HLEN); |
437d0d22 JR |
320 | memmove(header, header + MPLS_HLEN, len); |
321 | memcpy(header + len, &lse, sizeof lse); | |
b02475c5 SH |
322 | } |
323 | ||
324 | /* If 'packet' is an MPLS packet, removes its outermost MPLS label stack entry. | |
325 | * If the label that was removed was the only MPLS label, changes 'packet''s | |
326 | * Ethertype to 'ethtype' (which ordinarily should not be an MPLS | |
327 | * Ethertype). */ | |
328 | void | |
cf62fa4c | 329 | pop_mpls(struct dp_packet *packet, ovs_be16 ethtype) |
b02475c5 | 330 | { |
b02475c5 | 331 | if (is_mpls(packet)) { |
cf62fa4c | 332 | struct mpls_hdr *mh = dp_packet_l2_5(packet); |
437d0d22 JR |
333 | size_t len = packet->l2_5_ofs; |
334 | ||
799a91bb | 335 | set_ethertype(packet, ethtype); |
5fa008d4 | 336 | if (get_16aligned_be32(&mh->mpls_lse) & htonl(MPLS_BOS_MASK)) { |
cf62fa4c | 337 | dp_packet_set_l2_5(packet, NULL); |
b02475c5 SH |
338 | } |
339 | /* Shift the l2 header forward. */ | |
cf62fa4c PS |
340 | memmove((char*)dp_packet_data(packet) + MPLS_HLEN, dp_packet_data(packet), len); |
341 | dp_packet_resize_l2_5(packet, -MPLS_HLEN); | |
b02475c5 SH |
342 | } |
343 | } | |
344 | ||
e22f1753 BP |
345 | /* Converts hex digits in 'hex' to an Ethernet packet in '*packetp'. The |
346 | * caller must free '*packetp'. On success, returns NULL. On failure, returns | |
bb622f82 BP |
347 | * an error message and stores NULL in '*packetp'. |
348 | * | |
349 | * Aligns the L3 header of '*packetp' on a 32-bit boundary. */ | |
e22f1753 | 350 | const char * |
cf62fa4c | 351 | eth_from_hex(const char *hex, struct dp_packet **packetp) |
e22f1753 | 352 | { |
cf62fa4c | 353 | struct dp_packet *packet; |
e22f1753 | 354 | |
bb622f82 | 355 | /* Use 2 bytes of headroom to 32-bit align the L3 header. */ |
cf62fa4c | 356 | packet = *packetp = dp_packet_new_with_headroom(strlen(hex) / 2, 2); |
e22f1753 | 357 | |
cf62fa4c PS |
358 | if (dp_packet_put_hex(packet, hex, NULL)[0] != '\0') { |
359 | dp_packet_delete(packet); | |
e22f1753 BP |
360 | *packetp = NULL; |
361 | return "Trailing garbage in packet data"; | |
362 | } | |
363 | ||
cf62fa4c PS |
364 | if (dp_packet_size(packet) < ETH_HEADER_LEN) { |
365 | dp_packet_delete(packet); | |
e22f1753 BP |
366 | *packetp = NULL; |
367 | return "Packet data too short for Ethernet"; | |
368 | } | |
369 | ||
370 | return NULL; | |
371 | } | |
372 | ||
3b4d8ad3 JS |
373 | void |
374 | eth_format_masked(const uint8_t eth[ETH_ADDR_LEN], | |
375 | const uint8_t mask[ETH_ADDR_LEN], struct ds *s) | |
376 | { | |
377 | ds_put_format(s, ETH_ADDR_FMT, ETH_ADDR_ARGS(eth)); | |
73c0ce34 | 378 | if (mask && !eth_mask_is_exact(mask)) { |
3b4d8ad3 JS |
379 | ds_put_format(s, "/"ETH_ADDR_FMT, ETH_ADDR_ARGS(mask)); |
380 | } | |
381 | } | |
382 | ||
383 | void | |
384 | eth_addr_bitand(const uint8_t src[ETH_ADDR_LEN], | |
385 | const uint8_t mask[ETH_ADDR_LEN], | |
386 | uint8_t dst[ETH_ADDR_LEN]) | |
387 | { | |
388 | int i; | |
389 | ||
390 | for (i = 0; i < ETH_ADDR_LEN; i++) { | |
391 | dst[i] = src[i] & mask[i]; | |
392 | } | |
393 | } | |
394 | ||
aad29cd1 | 395 | /* Given the IP netmask 'netmask', returns the number of bits of the IP address |
c08201d6 BP |
396 | * that it specifies, that is, the number of 1-bits in 'netmask'. |
397 | * | |
398 | * If 'netmask' is not a CIDR netmask (see ip_is_cidr()), the return value will | |
399 | * still be in the valid range but isn't otherwise meaningful. */ | |
aad29cd1 BP |
400 | int |
401 | ip_count_cidr_bits(ovs_be32 netmask) | |
402 | { | |
d578065e | 403 | return 32 - ctz32(ntohl(netmask)); |
aad29cd1 BP |
404 | } |
405 | ||
406 | void | |
407 | ip_format_masked(ovs_be32 ip, ovs_be32 mask, struct ds *s) | |
408 | { | |
ed36537e | 409 | ds_put_format(s, IP_FMT, IP_ARGS(ip)); |
b8266395 | 410 | if (mask != OVS_BE32_MAX) { |
aad29cd1 BP |
411 | if (ip_is_cidr(mask)) { |
412 | ds_put_format(s, "/%d", ip_count_cidr_bits(mask)); | |
413 | } else { | |
ed36537e | 414 | ds_put_format(s, "/"IP_FMT, IP_ARGS(mask)); |
aad29cd1 BP |
415 | } |
416 | } | |
417 | } | |
418 | ||
419 | ||
d31f1109 JP |
420 | /* Stores the string representation of the IPv6 address 'addr' into the |
421 | * character array 'addr_str', which must be at least INET6_ADDRSTRLEN | |
422 | * bytes long. */ | |
423 | void | |
424 | format_ipv6_addr(char *addr_str, const struct in6_addr *addr) | |
425 | { | |
426 | inet_ntop(AF_INET6, addr, addr_str, INET6_ADDRSTRLEN); | |
427 | } | |
428 | ||
429 | void | |
430 | print_ipv6_addr(struct ds *string, const struct in6_addr *addr) | |
431 | { | |
aad29cd1 BP |
432 | char *dst; |
433 | ||
434 | ds_reserve(string, string->length + INET6_ADDRSTRLEN); | |
435 | ||
436 | dst = string->string + string->length; | |
437 | format_ipv6_addr(dst, addr); | |
438 | string->length += strlen(dst); | |
439 | } | |
d31f1109 | 440 | |
964a4d5f TLSC |
441 | void |
442 | print_ipv6_mapped(struct ds *s, const struct in6_addr *addr) | |
443 | { | |
444 | if (IN6_IS_ADDR_V4MAPPED(addr)) { | |
445 | ds_put_format(s, IP_FMT, addr->s6_addr[12], addr->s6_addr[13], | |
446 | addr->s6_addr[14], addr->s6_addr[15]); | |
447 | } else { | |
448 | print_ipv6_addr(s, addr); | |
449 | } | |
450 | } | |
451 | ||
aad29cd1 BP |
452 | void |
453 | print_ipv6_masked(struct ds *s, const struct in6_addr *addr, | |
454 | const struct in6_addr *mask) | |
455 | { | |
456 | print_ipv6_addr(s, addr); | |
457 | if (mask && !ipv6_mask_is_exact(mask)) { | |
458 | if (ipv6_is_cidr(mask)) { | |
459 | int cidr_bits = ipv6_count_cidr_bits(mask); | |
460 | ds_put_format(s, "/%d", cidr_bits); | |
461 | } else { | |
462 | ds_put_char(s, '/'); | |
463 | print_ipv6_addr(s, mask); | |
464 | } | |
465 | } | |
d31f1109 JP |
466 | } |
467 | ||
468 | struct in6_addr ipv6_addr_bitand(const struct in6_addr *a, | |
469 | const struct in6_addr *b) | |
470 | { | |
471 | int i; | |
472 | struct in6_addr dst; | |
473 | ||
474 | #ifdef s6_addr32 | |
475 | for (i=0; i<4; i++) { | |
476 | dst.s6_addr32[i] = a->s6_addr32[i] & b->s6_addr32[i]; | |
477 | } | |
478 | #else | |
479 | for (i=0; i<16; i++) { | |
480 | dst.s6_addr[i] = a->s6_addr[i] & b->s6_addr[i]; | |
481 | } | |
482 | #endif | |
483 | ||
484 | return dst; | |
485 | } | |
486 | ||
487 | /* Returns an in6_addr consisting of 'mask' high-order 1-bits and 128-N | |
488 | * low-order 0-bits. */ | |
489 | struct in6_addr | |
490 | ipv6_create_mask(int mask) | |
491 | { | |
492 | struct in6_addr netmask; | |
493 | uint8_t *netmaskp = &netmask.s6_addr[0]; | |
494 | ||
495 | memset(&netmask, 0, sizeof netmask); | |
496 | while (mask > 8) { | |
497 | *netmaskp = 0xff; | |
498 | netmaskp++; | |
499 | mask -= 8; | |
500 | } | |
501 | ||
502 | if (mask) { | |
503 | *netmaskp = 0xff << (8 - mask); | |
504 | } | |
505 | ||
506 | return netmask; | |
507 | } | |
508 | ||
aad29cd1 BP |
509 | /* Given the IPv6 netmask 'netmask', returns the number of bits of the IPv6 |
510 | * address that it specifies, that is, the number of 1-bits in 'netmask'. | |
ff0b06ee BP |
511 | * 'netmask' must be a CIDR netmask (see ipv6_is_cidr()). |
512 | * | |
513 | * If 'netmask' is not a CIDR netmask (see ipv6_is_cidr()), the return value | |
514 | * will still be in the valid range but isn't otherwise meaningful. */ | |
d31f1109 JP |
515 | int |
516 | ipv6_count_cidr_bits(const struct in6_addr *netmask) | |
517 | { | |
518 | int i; | |
519 | int count = 0; | |
520 | const uint8_t *netmaskp = &netmask->s6_addr[0]; | |
521 | ||
d31f1109 JP |
522 | for (i=0; i<16; i++) { |
523 | if (netmaskp[i] == 0xff) { | |
524 | count += 8; | |
525 | } else { | |
526 | uint8_t nm; | |
527 | ||
528 | for(nm = netmaskp[i]; nm; nm <<= 1) { | |
529 | count++; | |
530 | } | |
531 | break; | |
532 | } | |
533 | ||
534 | } | |
535 | ||
536 | return count; | |
537 | } | |
538 | ||
d31f1109 JP |
539 | /* Returns true if 'netmask' is a CIDR netmask, that is, if it consists of N |
540 | * high-order 1-bits and 128-N low-order 0-bits. */ | |
541 | bool | |
542 | ipv6_is_cidr(const struct in6_addr *netmask) | |
543 | { | |
544 | const uint8_t *netmaskp = &netmask->s6_addr[0]; | |
545 | int i; | |
546 | ||
547 | for (i=0; i<16; i++) { | |
548 | if (netmaskp[i] != 0xff) { | |
549 | uint8_t x = ~netmaskp[i]; | |
550 | if (x & (x + 1)) { | |
551 | return false; | |
552 | } | |
553 | while (++i < 16) { | |
554 | if (netmaskp[i]) { | |
555 | return false; | |
556 | } | |
557 | } | |
558 | } | |
559 | } | |
560 | ||
561 | return true; | |
562 | } | |
c25c91fd | 563 | |
5de1bb5c BP |
564 | /* Populates 'b' with an Ethernet II packet headed with the given 'eth_dst', |
565 | * 'eth_src' and 'eth_type' parameters. A payload of 'size' bytes is allocated | |
566 | * in 'b' and returned. This payload may be populated with appropriate | |
cf3b7538 JR |
567 | * information by the caller. Sets 'b''s 'frame' pointer and 'l3' offset to |
568 | * the Ethernet header and payload respectively. Aligns b->l3 on a 32-bit | |
bb622f82 | 569 | * boundary. |
eda1f38d BP |
570 | * |
571 | * The returned packet has enough headroom to insert an 802.1Q VLAN header if | |
572 | * desired. */ | |
40f78b38 | 573 | void * |
cf62fa4c | 574 | eth_compose(struct dp_packet *b, const uint8_t eth_dst[ETH_ADDR_LEN], |
5de1bb5c BP |
575 | const uint8_t eth_src[ETH_ADDR_LEN], uint16_t eth_type, |
576 | size_t size) | |
c25c91fd | 577 | { |
40f78b38 | 578 | void *data; |
c25c91fd | 579 | struct eth_header *eth; |
c25c91fd | 580 | |
cf62fa4c | 581 | dp_packet_clear(b); |
c25c91fd | 582 | |
bb622f82 BP |
583 | /* The magic 2 here ensures that the L3 header (when it is added later) |
584 | * will be 32-bit aligned. */ | |
cf62fa4c PS |
585 | dp_packet_prealloc_tailroom(b, 2 + ETH_HEADER_LEN + VLAN_HEADER_LEN + size); |
586 | dp_packet_reserve(b, 2 + VLAN_HEADER_LEN); | |
587 | eth = dp_packet_put_uninit(b, ETH_HEADER_LEN); | |
588 | data = dp_packet_put_uninit(b, size); | |
c25c91fd | 589 | |
40f78b38 | 590 | memcpy(eth->eth_dst, eth_dst, ETH_ADDR_LEN); |
c25c91fd | 591 | memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN); |
40f78b38 EJ |
592 | eth->eth_type = htons(eth_type); |
593 | ||
82eb5b0a | 594 | dp_packet_reset_offsets(b); |
cf62fa4c | 595 | dp_packet_set_l3(b, data); |
75a4ead1 | 596 | |
40f78b38 | 597 | return data; |
07a6cf77 EJ |
598 | } |
599 | ||
c97664b3 | 600 | static void |
cf62fa4c | 601 | packet_set_ipv4_addr(struct dp_packet *packet, |
7c457c33 | 602 | ovs_16aligned_be32 *addr, ovs_be32 new_addr) |
c97664b3 | 603 | { |
cf62fa4c | 604 | struct ip_header *nh = dp_packet_l3(packet); |
7c457c33 | 605 | ovs_be32 old_addr = get_16aligned_be32(addr); |
cf62fa4c | 606 | size_t l4_size = dp_packet_l4_size(packet); |
c97664b3 | 607 | |
5a51b2cd | 608 | if (nh->ip_proto == IPPROTO_TCP && l4_size >= TCP_HEADER_LEN) { |
cf62fa4c | 609 | struct tcp_header *th = dp_packet_l4(packet); |
c97664b3 | 610 | |
7c457c33 | 611 | th->tcp_csum = recalc_csum32(th->tcp_csum, old_addr, new_addr); |
5a51b2cd | 612 | } else if (nh->ip_proto == IPPROTO_UDP && l4_size >= UDP_HEADER_LEN ) { |
cf62fa4c | 613 | struct udp_header *uh = dp_packet_l4(packet); |
c97664b3 EJ |
614 | |
615 | if (uh->udp_csum) { | |
7c457c33 | 616 | uh->udp_csum = recalc_csum32(uh->udp_csum, old_addr, new_addr); |
c97664b3 EJ |
617 | if (!uh->udp_csum) { |
618 | uh->udp_csum = htons(0xffff); | |
619 | } | |
620 | } | |
621 | } | |
7c457c33 BP |
622 | nh->ip_csum = recalc_csum32(nh->ip_csum, old_addr, new_addr); |
623 | put_16aligned_be32(addr, new_addr); | |
c97664b3 EJ |
624 | } |
625 | ||
bc7a5acd AA |
626 | /* Returns true, if packet contains at least one routing header where |
627 | * segements_left > 0. | |
628 | * | |
437d0d22 | 629 | * This function assumes that L3 and L4 offsets are set in the packet. */ |
bc7a5acd | 630 | static bool |
cf62fa4c | 631 | packet_rh_present(struct dp_packet *packet) |
bc7a5acd | 632 | { |
4528f34f | 633 | const struct ovs_16aligned_ip6_hdr *nh; |
bc7a5acd AA |
634 | int nexthdr; |
635 | size_t len; | |
636 | size_t remaining; | |
cf62fa4c | 637 | uint8_t *data = dp_packet_l3(packet); |
bc7a5acd | 638 | |
437d0d22 | 639 | remaining = packet->l4_ofs - packet->l3_ofs; |
bc7a5acd AA |
640 | |
641 | if (remaining < sizeof *nh) { | |
642 | return false; | |
643 | } | |
4528f34f | 644 | nh = ALIGNED_CAST(struct ovs_16aligned_ip6_hdr *, data); |
bc7a5acd AA |
645 | data += sizeof *nh; |
646 | remaining -= sizeof *nh; | |
647 | nexthdr = nh->ip6_nxt; | |
648 | ||
649 | while (1) { | |
650 | if ((nexthdr != IPPROTO_HOPOPTS) | |
651 | && (nexthdr != IPPROTO_ROUTING) | |
652 | && (nexthdr != IPPROTO_DSTOPTS) | |
653 | && (nexthdr != IPPROTO_AH) | |
654 | && (nexthdr != IPPROTO_FRAGMENT)) { | |
655 | /* It's either a terminal header (e.g., TCP, UDP) or one we | |
656 | * don't understand. In either case, we're done with the | |
657 | * packet, so use it to fill in 'nw_proto'. */ | |
658 | break; | |
659 | } | |
660 | ||
661 | /* We only verify that at least 8 bytes of the next header are | |
662 | * available, but many of these headers are longer. Ensure that | |
663 | * accesses within the extension header are within those first 8 | |
664 | * bytes. All extension headers are required to be at least 8 | |
665 | * bytes. */ | |
666 | if (remaining < 8) { | |
667 | return false; | |
668 | } | |
669 | ||
670 | if (nexthdr == IPPROTO_AH) { | |
671 | /* A standard AH definition isn't available, but the fields | |
672 | * we care about are in the same location as the generic | |
673 | * option header--only the header length is calculated | |
674 | * differently. */ | |
675 | const struct ip6_ext *ext_hdr = (struct ip6_ext *)data; | |
676 | ||
677 | nexthdr = ext_hdr->ip6e_nxt; | |
678 | len = (ext_hdr->ip6e_len + 2) * 4; | |
679 | } else if (nexthdr == IPPROTO_FRAGMENT) { | |
4528f34f BP |
680 | const struct ovs_16aligned_ip6_frag *frag_hdr |
681 | = ALIGNED_CAST(struct ovs_16aligned_ip6_frag *, data); | |
bc7a5acd AA |
682 | |
683 | nexthdr = frag_hdr->ip6f_nxt; | |
684 | len = sizeof *frag_hdr; | |
685 | } else if (nexthdr == IPPROTO_ROUTING) { | |
686 | const struct ip6_rthdr *rh = (struct ip6_rthdr *)data; | |
687 | ||
688 | if (rh->ip6r_segleft > 0) { | |
689 | return true; | |
690 | } | |
691 | ||
692 | nexthdr = rh->ip6r_nxt; | |
693 | len = (rh->ip6r_len + 1) * 8; | |
694 | } else { | |
695 | const struct ip6_ext *ext_hdr = (struct ip6_ext *)data; | |
696 | ||
697 | nexthdr = ext_hdr->ip6e_nxt; | |
698 | len = (ext_hdr->ip6e_len + 1) * 8; | |
699 | } | |
700 | ||
701 | if (remaining < len) { | |
702 | return false; | |
703 | } | |
704 | remaining -= len; | |
705 | data += len; | |
706 | } | |
707 | ||
708 | return false; | |
709 | } | |
710 | ||
711 | static void | |
cf62fa4c | 712 | packet_update_csum128(struct dp_packet *packet, uint8_t proto, |
4528f34f | 713 | ovs_16aligned_be32 addr[4], const ovs_be32 new_addr[4]) |
bc7a5acd | 714 | { |
cf62fa4c | 715 | size_t l4_size = dp_packet_l4_size(packet); |
5a51b2cd JR |
716 | |
717 | if (proto == IPPROTO_TCP && l4_size >= TCP_HEADER_LEN) { | |
cf62fa4c | 718 | struct tcp_header *th = dp_packet_l4(packet); |
bc7a5acd AA |
719 | |
720 | th->tcp_csum = recalc_csum128(th->tcp_csum, addr, new_addr); | |
5a51b2cd | 721 | } else if (proto == IPPROTO_UDP && l4_size >= UDP_HEADER_LEN) { |
cf62fa4c | 722 | struct udp_header *uh = dp_packet_l4(packet); |
bc7a5acd AA |
723 | |
724 | if (uh->udp_csum) { | |
725 | uh->udp_csum = recalc_csum128(uh->udp_csum, addr, new_addr); | |
726 | if (!uh->udp_csum) { | |
727 | uh->udp_csum = htons(0xffff); | |
728 | } | |
729 | } | |
5abf65d0 JG |
730 | } else if (proto == IPPROTO_ICMPV6 && |
731 | l4_size >= sizeof(struct icmp6_header)) { | |
cf62fa4c | 732 | struct icmp6_header *icmp = dp_packet_l4(packet); |
00894212 JG |
733 | |
734 | icmp->icmp6_cksum = recalc_csum128(icmp->icmp6_cksum, addr, new_addr); | |
bc7a5acd AA |
735 | } |
736 | } | |
737 | ||
738 | static void | |
cf62fa4c | 739 | packet_set_ipv6_addr(struct dp_packet *packet, uint8_t proto, |
4068403a | 740 | ovs_16aligned_be32 addr[4], const ovs_be32 new_addr[4], |
bc7a5acd AA |
741 | bool recalculate_csum) |
742 | { | |
743 | if (recalculate_csum) { | |
4528f34f | 744 | packet_update_csum128(packet, proto, addr, new_addr); |
bc7a5acd | 745 | } |
4068403a | 746 | memcpy(addr, new_addr, sizeof(ovs_be32[4])); |
bc7a5acd AA |
747 | } |
748 | ||
749 | static void | |
4528f34f | 750 | packet_set_ipv6_flow_label(ovs_16aligned_be32 *flow_label, ovs_be32 flow_key) |
bc7a5acd | 751 | { |
4528f34f BP |
752 | ovs_be32 old_label = get_16aligned_be32(flow_label); |
753 | ovs_be32 new_label = (old_label & htonl(~IPV6_LABEL_MASK)) | flow_key; | |
754 | put_16aligned_be32(flow_label, new_label); | |
bc7a5acd AA |
755 | } |
756 | ||
757 | static void | |
4528f34f | 758 | packet_set_ipv6_tc(ovs_16aligned_be32 *flow_label, uint8_t tc) |
bc7a5acd | 759 | { |
4528f34f BP |
760 | ovs_be32 old_label = get_16aligned_be32(flow_label); |
761 | ovs_be32 new_label = (old_label & htonl(0xF00FFFFF)) | htonl(tc << 20); | |
762 | put_16aligned_be32(flow_label, new_label); | |
bc7a5acd AA |
763 | } |
764 | ||
c97664b3 EJ |
765 | /* Modifies the IPv4 header fields of 'packet' to be consistent with 'src', |
766 | * 'dst', 'tos', and 'ttl'. Updates 'packet''s L4 checksums as appropriate. | |
767 | * 'packet' must contain a valid IPv4 packet with correctly populated l[347] | |
768 | * markers. */ | |
769 | void | |
cf62fa4c | 770 | packet_set_ipv4(struct dp_packet *packet, ovs_be32 src, ovs_be32 dst, |
c97664b3 EJ |
771 | uint8_t tos, uint8_t ttl) |
772 | { | |
cf62fa4c | 773 | struct ip_header *nh = dp_packet_l3(packet); |
c97664b3 | 774 | |
7c457c33 | 775 | if (get_16aligned_be32(&nh->ip_src) != src) { |
c97664b3 EJ |
776 | packet_set_ipv4_addr(packet, &nh->ip_src, src); |
777 | } | |
778 | ||
7c457c33 | 779 | if (get_16aligned_be32(&nh->ip_dst) != dst) { |
c97664b3 EJ |
780 | packet_set_ipv4_addr(packet, &nh->ip_dst, dst); |
781 | } | |
782 | ||
783 | if (nh->ip_tos != tos) { | |
784 | uint8_t *field = &nh->ip_tos; | |
785 | ||
786 | nh->ip_csum = recalc_csum16(nh->ip_csum, htons((uint16_t) *field), | |
787 | htons((uint16_t) tos)); | |
788 | *field = tos; | |
789 | } | |
790 | ||
791 | if (nh->ip_ttl != ttl) { | |
792 | uint8_t *field = &nh->ip_ttl; | |
793 | ||
794 | nh->ip_csum = recalc_csum16(nh->ip_csum, htons(*field << 8), | |
795 | htons(ttl << 8)); | |
796 | *field = ttl; | |
797 | } | |
798 | } | |
799 | ||
bc7a5acd AA |
800 | /* Modifies the IPv6 header fields of 'packet' to be consistent with 'src', |
801 | * 'dst', 'traffic class', and 'next hop'. Updates 'packet''s L4 checksums as | |
802 | * appropriate. 'packet' must contain a valid IPv6 packet with correctly | |
437d0d22 | 803 | * populated l[34] offsets. */ |
bc7a5acd | 804 | void |
cf62fa4c | 805 | packet_set_ipv6(struct dp_packet *packet, uint8_t proto, const ovs_be32 src[4], |
bc7a5acd AA |
806 | const ovs_be32 dst[4], uint8_t key_tc, ovs_be32 key_fl, |
807 | uint8_t key_hl) | |
808 | { | |
cf62fa4c | 809 | struct ovs_16aligned_ip6_hdr *nh = dp_packet_l3(packet); |
bc7a5acd AA |
810 | |
811 | if (memcmp(&nh->ip6_src, src, sizeof(ovs_be32[4]))) { | |
4528f34f | 812 | packet_set_ipv6_addr(packet, proto, nh->ip6_src.be32, src, true); |
bc7a5acd AA |
813 | } |
814 | ||
815 | if (memcmp(&nh->ip6_dst, dst, sizeof(ovs_be32[4]))) { | |
4528f34f | 816 | packet_set_ipv6_addr(packet, proto, nh->ip6_dst.be32, dst, |
bc7a5acd AA |
817 | !packet_rh_present(packet)); |
818 | } | |
819 | ||
820 | packet_set_ipv6_tc(&nh->ip6_flow, key_tc); | |
821 | ||
822 | packet_set_ipv6_flow_label(&nh->ip6_flow, key_fl); | |
823 | ||
824 | nh->ip6_hlim = key_hl; | |
825 | } | |
826 | ||
c97664b3 EJ |
827 | static void |
828 | packet_set_port(ovs_be16 *port, ovs_be16 new_port, ovs_be16 *csum) | |
829 | { | |
830 | if (*port != new_port) { | |
831 | *csum = recalc_csum16(*csum, *port, new_port); | |
832 | *port = new_port; | |
833 | } | |
834 | } | |
835 | ||
836 | /* Sets the TCP source and destination port ('src' and 'dst' respectively) of | |
837 | * the TCP header contained in 'packet'. 'packet' must be a valid TCP packet | |
437d0d22 | 838 | * with its l4 offset properly populated. */ |
c97664b3 | 839 | void |
cf62fa4c | 840 | packet_set_tcp_port(struct dp_packet *packet, ovs_be16 src, ovs_be16 dst) |
c97664b3 | 841 | { |
cf62fa4c | 842 | struct tcp_header *th = dp_packet_l4(packet); |
c97664b3 EJ |
843 | |
844 | packet_set_port(&th->tcp_src, src, &th->tcp_csum); | |
845 | packet_set_port(&th->tcp_dst, dst, &th->tcp_csum); | |
846 | } | |
847 | ||
848 | /* Sets the UDP source and destination port ('src' and 'dst' respectively) of | |
849 | * the UDP header contained in 'packet'. 'packet' must be a valid UDP packet | |
437d0d22 | 850 | * with its l4 offset properly populated. */ |
c97664b3 | 851 | void |
cf62fa4c | 852 | packet_set_udp_port(struct dp_packet *packet, ovs_be16 src, ovs_be16 dst) |
c97664b3 | 853 | { |
cf62fa4c | 854 | struct udp_header *uh = dp_packet_l4(packet); |
c97664b3 EJ |
855 | |
856 | if (uh->udp_csum) { | |
857 | packet_set_port(&uh->udp_src, src, &uh->udp_csum); | |
858 | packet_set_port(&uh->udp_dst, dst, &uh->udp_csum); | |
859 | ||
860 | if (!uh->udp_csum) { | |
861 | uh->udp_csum = htons(0xffff); | |
862 | } | |
863 | } else { | |
864 | uh->udp_src = src; | |
865 | uh->udp_dst = dst; | |
866 | } | |
867 | } | |
12113c39 | 868 | |
c6bcb685 JS |
869 | /* Sets the SCTP source and destination port ('src' and 'dst' respectively) of |
870 | * the SCTP header contained in 'packet'. 'packet' must be a valid SCTP packet | |
437d0d22 | 871 | * with its l4 offset properly populated. */ |
c6bcb685 | 872 | void |
cf62fa4c | 873 | packet_set_sctp_port(struct dp_packet *packet, ovs_be16 src, ovs_be16 dst) |
c6bcb685 | 874 | { |
cf62fa4c | 875 | struct sctp_header *sh = dp_packet_l4(packet); |
c6bcb685 | 876 | ovs_be32 old_csum, old_correct_csum, new_csum; |
cf62fa4c | 877 | uint16_t tp_len = dp_packet_l4_size(packet); |
c6bcb685 | 878 | |
5fa008d4 BP |
879 | old_csum = get_16aligned_be32(&sh->sctp_csum); |
880 | put_16aligned_be32(&sh->sctp_csum, 0); | |
437d0d22 | 881 | old_correct_csum = crc32c((void *)sh, tp_len); |
c6bcb685 JS |
882 | |
883 | sh->sctp_src = src; | |
884 | sh->sctp_dst = dst; | |
885 | ||
437d0d22 | 886 | new_csum = crc32c((void *)sh, tp_len); |
5fa008d4 | 887 | put_16aligned_be32(&sh->sctp_csum, old_csum ^ old_correct_csum ^ new_csum); |
c6bcb685 JS |
888 | } |
889 | ||
e60e935b | 890 | void |
cf62fa4c | 891 | packet_set_nd(struct dp_packet *packet, const ovs_be32 target[4], |
e60e935b SRCSA |
892 | const uint8_t sll[ETH_ADDR_LEN], |
893 | const uint8_t tll[ETH_ADDR_LEN]) { | |
894 | struct ovs_nd_msg *ns; | |
895 | struct ovs_nd_opt *nd_opt; | |
cf62fa4c | 896 | int bytes_remain = dp_packet_l4_size(packet); |
e60e935b SRCSA |
897 | |
898 | if (OVS_UNLIKELY(bytes_remain < sizeof(*ns))) { | |
899 | return; | |
900 | } | |
901 | ||
cf62fa4c | 902 | ns = dp_packet_l4(packet); |
e60e935b SRCSA |
903 | nd_opt = &ns->options[0]; |
904 | bytes_remain -= sizeof(*ns); | |
905 | ||
906 | if (memcmp(&ns->target, target, sizeof(ovs_be32[4]))) { | |
907 | packet_set_ipv6_addr(packet, IPPROTO_ICMPV6, | |
908 | ns->target.be32, | |
909 | target, true); | |
910 | } | |
911 | ||
912 | while (bytes_remain >= ND_OPT_LEN && nd_opt->nd_opt_len != 0) { | |
913 | if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LINKADDR | |
914 | && nd_opt->nd_opt_len == 1) { | |
915 | if (memcmp(nd_opt->nd_opt_data, sll, ETH_ADDR_LEN)) { | |
916 | ovs_be16 *csum = &(ns->icmph.icmp6_cksum); | |
917 | ||
918 | *csum = recalc_csum48(*csum, nd_opt->nd_opt_data, sll); | |
919 | memcpy(nd_opt->nd_opt_data, sll, ETH_ADDR_LEN); | |
920 | } | |
921 | ||
922 | /* A packet can only contain one SLL or TLL option */ | |
923 | break; | |
924 | } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LINKADDR | |
925 | && nd_opt->nd_opt_len == 1) { | |
926 | if (memcmp(nd_opt->nd_opt_data, tll, ETH_ADDR_LEN)) { | |
927 | ovs_be16 *csum = &(ns->icmph.icmp6_cksum); | |
928 | ||
929 | *csum = recalc_csum48(*csum, nd_opt->nd_opt_data, tll); | |
930 | memcpy(nd_opt->nd_opt_data, tll, ETH_ADDR_LEN); | |
931 | } | |
932 | ||
933 | /* A packet can only contain one SLL or TLL option */ | |
934 | break; | |
935 | } | |
936 | ||
937 | nd_opt += nd_opt->nd_opt_len; | |
938 | bytes_remain -= nd_opt->nd_opt_len * ND_OPT_LEN; | |
939 | } | |
940 | } | |
941 | ||
61bf6666 JR |
942 | const char * |
943 | packet_tcp_flag_to_string(uint32_t flag) | |
944 | { | |
945 | switch (flag) { | |
946 | case TCP_FIN: | |
947 | return "fin"; | |
948 | case TCP_SYN: | |
949 | return "syn"; | |
950 | case TCP_RST: | |
951 | return "rst"; | |
952 | case TCP_PSH: | |
953 | return "psh"; | |
954 | case TCP_ACK: | |
955 | return "ack"; | |
956 | case TCP_URG: | |
957 | return "urg"; | |
958 | case TCP_ECE: | |
959 | return "ece"; | |
960 | case TCP_CWR: | |
961 | return "cwr"; | |
962 | case TCP_NS: | |
963 | return "ns"; | |
964 | case 0x200: | |
965 | return "[200]"; | |
966 | case 0x400: | |
967 | return "[400]"; | |
968 | case 0x800: | |
969 | return "[800]"; | |
970 | default: | |
971 | return NULL; | |
972 | } | |
973 | } | |
974 | ||
7393104d | 975 | /* Appends a string representation of the TCP flags value 'tcp_flags' |
f41b5b3b | 976 | * (e.g. from struct flow.tcp_flags or obtained via TCP_FLAGS) to 's', in the |
7393104d BP |
977 | * format used by tcpdump. */ |
978 | void | |
a66733a8 | 979 | packet_format_tcp_flags(struct ds *s, uint16_t tcp_flags) |
7393104d BP |
980 | { |
981 | if (!tcp_flags) { | |
982 | ds_put_cstr(s, "none"); | |
983 | return; | |
984 | } | |
985 | ||
986 | if (tcp_flags & TCP_SYN) { | |
987 | ds_put_char(s, 'S'); | |
988 | } | |
989 | if (tcp_flags & TCP_FIN) { | |
990 | ds_put_char(s, 'F'); | |
991 | } | |
992 | if (tcp_flags & TCP_PSH) { | |
993 | ds_put_char(s, 'P'); | |
994 | } | |
995 | if (tcp_flags & TCP_RST) { | |
996 | ds_put_char(s, 'R'); | |
997 | } | |
998 | if (tcp_flags & TCP_URG) { | |
999 | ds_put_char(s, 'U'); | |
1000 | } | |
1001 | if (tcp_flags & TCP_ACK) { | |
1002 | ds_put_char(s, '.'); | |
1003 | } | |
a66733a8 JR |
1004 | if (tcp_flags & TCP_ECE) { |
1005 | ds_put_cstr(s, "E"); | |
7393104d | 1006 | } |
a66733a8 JR |
1007 | if (tcp_flags & TCP_CWR) { |
1008 | ds_put_cstr(s, "C"); | |
1009 | } | |
1010 | if (tcp_flags & TCP_NS) { | |
1011 | ds_put_cstr(s, "N"); | |
1012 | } | |
1013 | if (tcp_flags & 0x200) { | |
1014 | ds_put_cstr(s, "[200]"); | |
1015 | } | |
1016 | if (tcp_flags & 0x400) { | |
1017 | ds_put_cstr(s, "[400]"); | |
1018 | } | |
1019 | if (tcp_flags & 0x800) { | |
1020 | ds_put_cstr(s, "[800]"); | |
7393104d BP |
1021 | } |
1022 | } | |
a36de779 PS |
1023 | |
1024 | #define ARP_PACKET_SIZE (2 + ETH_HEADER_LEN + VLAN_HEADER_LEN + \ | |
1025 | ARP_ETH_HEADER_LEN) | |
1026 | ||
eb0b295e BP |
1027 | /* Clears 'b' and replaces its contents by an ARP frame with the specified |
1028 | * 'arp_op', 'arp_sha', 'arp_tha', 'arp_spa', and 'arp_tpa'. The outer | |
1029 | * Ethernet frame is initialized with Ethernet source 'arp_sha' and destination | |
1030 | * 'arp_tha', except that destination ff:ff:ff:ff:ff:ff is used instead if | |
1031 | * 'broadcast' is true. */ | |
a36de779 | 1032 | void |
eb0b295e BP |
1033 | compose_arp(struct dp_packet *b, uint16_t arp_op, |
1034 | const uint8_t arp_sha[ETH_ADDR_LEN], | |
1035 | const uint8_t arp_tha[ETH_ADDR_LEN], bool broadcast, | |
1036 | ovs_be32 arp_spa, ovs_be32 arp_tpa) | |
a36de779 PS |
1037 | { |
1038 | struct eth_header *eth; | |
1039 | struct arp_eth_header *arp; | |
1040 | ||
cf62fa4c PS |
1041 | dp_packet_clear(b); |
1042 | dp_packet_prealloc_tailroom(b, ARP_PACKET_SIZE); | |
1043 | dp_packet_reserve(b, 2 + VLAN_HEADER_LEN); | |
a36de779 | 1044 | |
cf62fa4c | 1045 | eth = dp_packet_put_uninit(b, sizeof *eth); |
eb0b295e BP |
1046 | memcpy(eth->eth_dst, broadcast ? eth_addr_broadcast : arp_tha, |
1047 | ETH_ADDR_LEN); | |
1048 | memcpy(eth->eth_src, arp_sha, ETH_ADDR_LEN); | |
a36de779 PS |
1049 | eth->eth_type = htons(ETH_TYPE_ARP); |
1050 | ||
cf62fa4c | 1051 | arp = dp_packet_put_uninit(b, sizeof *arp); |
a36de779 PS |
1052 | arp->ar_hrd = htons(ARP_HRD_ETHERNET); |
1053 | arp->ar_pro = htons(ARP_PRO_IP); | |
1054 | arp->ar_hln = sizeof arp->ar_sha; | |
1055 | arp->ar_pln = sizeof arp->ar_spa; | |
eb0b295e BP |
1056 | arp->ar_op = htons(arp_op); |
1057 | memcpy(arp->ar_sha, arp_sha, ETH_ADDR_LEN); | |
1058 | memcpy(arp->ar_tha, arp_tha, ETH_ADDR_LEN); | |
a36de779 | 1059 | |
eb0b295e BP |
1060 | put_16aligned_be32(&arp->ar_spa, arp_spa); |
1061 | put_16aligned_be32(&arp->ar_tpa, arp_tpa); | |
a36de779 | 1062 | |
82eb5b0a | 1063 | dp_packet_reset_offsets(b); |
cf62fa4c | 1064 | dp_packet_set_l3(b, arp); |
a36de779 | 1065 | } |
0292a0c9 JG |
1066 | |
1067 | uint32_t | |
1068 | packet_csum_pseudoheader(const struct ip_header *ip) | |
1069 | { | |
1070 | uint32_t partial = 0; | |
1071 | ||
1072 | partial = csum_add32(partial, get_16aligned_be32(&ip->ip_src)); | |
1073 | partial = csum_add32(partial, get_16aligned_be32(&ip->ip_dst)); | |
1074 | partial = csum_add16(partial, htons(ip->ip_proto)); | |
1075 | partial = csum_add16(partial, htons(ntohs(ip->ip_tot_len) - | |
1076 | IP_IHL(ip->ip_ihl_ver) * 4)); | |
1077 | ||
1078 | return partial; | |
1079 | } |