2 * Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
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:
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
19 #include <arpa/inet.h>
20 #include <sys/socket.h>
21 #include <netinet/in.h>
22 #include <netinet/ip6.h>
24 #include "byte-order.h"
28 #include "dynamic-string.h"
30 #include "ovs-thread.h"
32 const struct in6_addr in6addr_exact = IN6ADDR_EXACT_INIT;
34 /* Parses 's' as a 16-digit hexadecimal number representing a datapath ID. On
35 * success stores the dpid into '*dpidp' and returns true, on failure stores 0
36 * into '*dpidp' and returns false.
38 * Rejects an all-zeros dpid as invalid. */
40 dpid_from_string(const char *s, uint64_t *dpidp)
42 *dpidp = (strlen(s) == 16 && strspn(s, "0123456789abcdefABCDEF") == 16
43 ? strtoull(s, NULL, 16)
48 /* Returns true if 'ea' is a reserved address, that a bridge must never
49 * forward, false otherwise.
51 * If you change this function's behavior, please update corresponding
52 * documentation in vswitch.xml at the same time. */
54 eth_addr_is_reserved(const uint8_t ea[ETH_ADDR_LEN])
56 struct eth_addr_node {
57 struct hmap_node hmap_node;
61 static struct eth_addr_node nodes[] = {
62 /* STP, IEEE pause frames, and other reserved protocols. */
63 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000000ULL },
64 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000001ULL },
65 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000002ULL },
66 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000003ULL },
67 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000004ULL },
68 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000005ULL },
69 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000006ULL },
70 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000007ULL },
71 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000008ULL },
72 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000009ULL },
73 { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000aULL },
74 { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000bULL },
75 { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000cULL },
76 { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000dULL },
77 { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000eULL },
78 { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000fULL },
80 /* Extreme protocols. */
81 { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000000ULL }, /* EDP. */
82 { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000004ULL }, /* EAPS. */
83 { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000006ULL }, /* EAPS. */
85 /* Cisco protocols. */
86 { HMAP_NODE_NULL_INITIALIZER, 0x01000c000000ULL }, /* ISL. */
87 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccccULL }, /* PAgP, UDLD, CDP,
89 { HMAP_NODE_NULL_INITIALIZER, 0x01000ccccccdULL }, /* PVST+. */
90 { HMAP_NODE_NULL_INITIALIZER, 0x01000ccdcdcdULL }, /* STP Uplink Fast,
94 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc0ULL },
95 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc1ULL },
96 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc2ULL },
97 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc3ULL },
98 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc4ULL },
99 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc5ULL },
100 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc6ULL },
101 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc7ULL },
104 static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
105 struct eth_addr_node *node;
106 static struct hmap addrs;
109 if (ovsthread_once_start(&once)) {
111 for (node = nodes; node < &nodes[ARRAY_SIZE(nodes)]; node++) {
112 hmap_insert(&addrs, &node->hmap_node,
113 hash_2words(node->ea64, node->ea64 >> 32));
115 ovsthread_once_done(&once);
118 ea64 = eth_addr_to_uint64(ea);
119 HMAP_FOR_EACH_IN_BUCKET (node, hmap_node, hash_2words(ea64, ea64 >> 32),
121 if (node->ea64 == ea64) {
129 eth_addr_from_string(const char *s, uint8_t ea[ETH_ADDR_LEN])
131 if (sscanf(s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(ea))
132 == ETH_ADDR_SCAN_COUNT) {
135 memset(ea, 0, ETH_ADDR_LEN);
140 /* Fills 'b' with a Reverse ARP packet with Ethernet source address 'eth_src'.
141 * This function is used by Open vSwitch to compose packets in cases where
142 * context is important but content doesn't (or shouldn't) matter.
144 * The returned packet has enough headroom to insert an 802.1Q VLAN header if
147 compose_rarp(struct ofpbuf *b, const uint8_t eth_src[ETH_ADDR_LEN])
149 struct eth_header *eth;
150 struct arp_eth_header *arp;
153 ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + VLAN_HEADER_LEN
154 + ARP_ETH_HEADER_LEN);
155 ofpbuf_reserve(b, VLAN_HEADER_LEN);
156 eth = ofpbuf_put_uninit(b, sizeof *eth);
157 memcpy(eth->eth_dst, eth_addr_broadcast, ETH_ADDR_LEN);
158 memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
159 eth->eth_type = htons(ETH_TYPE_RARP);
161 arp = ofpbuf_put_uninit(b, sizeof *arp);
162 arp->ar_hrd = htons(ARP_HRD_ETHERNET);
163 arp->ar_pro = htons(ARP_PRO_IP);
164 arp->ar_hln = sizeof arp->ar_sha;
165 arp->ar_pln = sizeof arp->ar_spa;
166 arp->ar_op = htons(ARP_OP_RARP);
167 memcpy(arp->ar_sha, eth_src, ETH_ADDR_LEN);
168 arp->ar_spa = htonl(0);
169 memcpy(arp->ar_tha, eth_src, ETH_ADDR_LEN);
170 arp->ar_tpa = htonl(0);
173 /* Insert VLAN header according to given TCI. Packet passed must be Ethernet
174 * packet. Ignores the CFI bit of 'tci' using 0 instead.
176 * Also sets 'packet->l2' to point to the new Ethernet header. */
178 eth_push_vlan(struct ofpbuf *packet, ovs_be16 tci)
180 struct eth_header *eh = packet->data;
181 struct vlan_eth_header *veh;
183 /* Insert new 802.1Q header. */
184 struct vlan_eth_header tmp;
185 memcpy(tmp.veth_dst, eh->eth_dst, ETH_ADDR_LEN);
186 memcpy(tmp.veth_src, eh->eth_src, ETH_ADDR_LEN);
187 tmp.veth_type = htons(ETH_TYPE_VLAN);
188 tmp.veth_tci = tci & htons(~VLAN_CFI);
189 tmp.veth_next_type = eh->eth_type;
191 veh = ofpbuf_push_uninit(packet, VLAN_HEADER_LEN);
192 memcpy(veh, &tmp, sizeof tmp);
194 packet->l2 = packet->data;
197 /* Removes outermost VLAN header (if any is present) from 'packet'.
199 * 'packet->l2_5' should initially point to 'packet''s outer-most MPLS header
200 * or may be NULL if there are no MPLS headers. */
202 eth_pop_vlan(struct ofpbuf *packet)
204 struct vlan_eth_header *veh = packet->l2;
205 if (packet->size >= sizeof *veh
206 && veh->veth_type == htons(ETH_TYPE_VLAN)) {
207 struct eth_header tmp;
209 memcpy(tmp.eth_dst, veh->veth_dst, ETH_ADDR_LEN);
210 memcpy(tmp.eth_src, veh->veth_src, ETH_ADDR_LEN);
211 tmp.eth_type = veh->veth_next_type;
213 ofpbuf_pull(packet, VLAN_HEADER_LEN);
214 packet->l2 = (char*)packet->l2 + VLAN_HEADER_LEN;
215 memcpy(packet->data, &tmp, sizeof tmp);
219 /* Return depth of mpls stack.
221 * 'packet->l2_5' should initially point to 'packet''s outer-most MPLS header
222 * or may be NULL if there are no MPLS headers. */
224 eth_mpls_depth(const struct ofpbuf *packet)
226 struct mpls_hdr *mh = packet->l2_5;
234 while (packet->size >= ((char *)mh - (char *)packet->data) + sizeof *mh) {
236 if (mh->mpls_lse & htonl(MPLS_BOS_MASK)) {
245 /* Set ethertype of the packet. */
247 set_ethertype(struct ofpbuf *packet, ovs_be16 eth_type)
249 struct eth_header *eh = packet->data;
251 if (eh->eth_type == htons(ETH_TYPE_VLAN)) {
253 p = ALIGNED_CAST(ovs_be16 *,
254 (char *)(packet->l2_5 ? packet->l2_5 : packet->l3) - 2);
257 eh->eth_type = eth_type;
261 static bool is_mpls(struct ofpbuf *packet)
263 return packet->l2_5 != NULL;
266 /* Set time to live (TTL) of an MPLS label stack entry (LSE). */
268 set_mpls_lse_ttl(ovs_be32 *lse, uint8_t ttl)
270 *lse &= ~htonl(MPLS_TTL_MASK);
271 *lse |= htonl((ttl << MPLS_TTL_SHIFT) & MPLS_TTL_MASK);
274 /* Set traffic class (TC) of an MPLS label stack entry (LSE). */
276 set_mpls_lse_tc(ovs_be32 *lse, uint8_t tc)
278 *lse &= ~htonl(MPLS_TC_MASK);
279 *lse |= htonl((tc << MPLS_TC_SHIFT) & MPLS_TC_MASK);
282 /* Set label of an MPLS label stack entry (LSE). */
284 set_mpls_lse_label(ovs_be32 *lse, ovs_be32 label)
286 *lse &= ~htonl(MPLS_LABEL_MASK);
287 *lse |= htonl((ntohl(label) << MPLS_LABEL_SHIFT) & MPLS_LABEL_MASK);
290 /* Set bottom of stack (BoS) bit of an MPLS label stack entry (LSE). */
292 set_mpls_lse_bos(ovs_be32 *lse, uint8_t bos)
294 *lse &= ~htonl(MPLS_BOS_MASK);
295 *lse |= htonl((bos << MPLS_BOS_SHIFT) & MPLS_BOS_MASK);
298 /* Compose an MPLS label stack entry (LSE) from its components:
299 * label, traffic class (TC), time to live (TTL) and
300 * bottom of stack (BoS) bit. */
302 set_mpls_lse_values(uint8_t ttl, uint8_t tc, uint8_t bos, ovs_be32 label)
304 ovs_be32 lse = htonl(0);
305 set_mpls_lse_ttl(&lse, ttl);
306 set_mpls_lse_tc(&lse, tc);
307 set_mpls_lse_bos(&lse, bos);
308 set_mpls_lse_label(&lse, label);
312 /* Push an new MPLS stack entry onto the MPLS stack and adjust 'packet->l2' and
313 * 'packet->l2_5' accordingly. The new entry will be the outermost entry on
316 * Previous to calling this function, 'packet->l2_5' must be set; if the MPLS
317 * label to be pushed will be the first label in 'packet', then it should be
318 * the same as 'packet->l3'. */
320 push_mpls_lse(struct ofpbuf *packet, struct mpls_hdr *mh)
324 header = ofpbuf_push_uninit(packet, MPLS_HLEN);
325 len = (char *)packet->l2_5 - (char *)packet->l2;
326 memmove(header, packet->l2, len);
327 memcpy(header + len, mh, sizeof *mh);
328 packet->l2 = (char*)packet->l2 - MPLS_HLEN;
329 packet->l2_5 = (char*)packet->l2_5 - MPLS_HLEN;
332 /* Set MPLS label stack entry to outermost MPLS header.*/
334 set_mpls_lse(struct ofpbuf *packet, ovs_be32 mpls_lse)
336 struct mpls_hdr *mh = packet->l2_5;
338 /* Packet type should be MPLS to set label stack entry. */
339 if (is_mpls(packet)) {
340 /* Update mpls label stack entry. */
341 mh->mpls_lse = mpls_lse;
345 /* Push MPLS label stack entry 'lse' onto 'packet' as the the outermost MPLS
346 * header. If 'packet' does not already have any MPLS labels, then its
347 * Ethertype is changed to 'ethtype' (which must be an MPLS Ethertype). */
349 push_mpls(struct ofpbuf *packet, ovs_be16 ethtype, ovs_be32 lse)
353 if (!eth_type_mpls(ethtype)) {
357 if (!is_mpls(packet)) {
358 /* Set ethtype and MPLS label stack entry. */
359 set_ethertype(packet, ethtype);
360 packet->l2_5 = packet->l3;
363 /* Push new MPLS shim header onto packet. */
365 push_mpls_lse(packet, &mh);
368 /* If 'packet' is an MPLS packet, removes its outermost MPLS label stack entry.
369 * If the label that was removed was the only MPLS label, changes 'packet''s
370 * Ethertype to 'ethtype' (which ordinarily should not be an MPLS
373 pop_mpls(struct ofpbuf *packet, ovs_be16 ethtype)
375 struct mpls_hdr *mh = NULL;
377 if (is_mpls(packet)) {
380 len = (char*)packet->l2_5 - (char*)packet->l2;
381 set_ethertype(packet, ethtype);
382 if (mh->mpls_lse & htonl(MPLS_BOS_MASK)) {
385 packet->l2_5 = (char*)packet->l2_5 + MPLS_HLEN;
387 /* Shift the l2 header forward. */
388 memmove((char*)packet->data + MPLS_HLEN, packet->data, len);
389 packet->size -= MPLS_HLEN;
390 packet->data = (char*)packet->data + MPLS_HLEN;
391 packet->l2 = (char*)packet->l2 + MPLS_HLEN;
395 /* Converts hex digits in 'hex' to an Ethernet packet in '*packetp'. The
396 * caller must free '*packetp'. On success, returns NULL. On failure, returns
397 * an error message and stores NULL in '*packetp'. */
399 eth_from_hex(const char *hex, struct ofpbuf **packetp)
401 struct ofpbuf *packet;
403 packet = *packetp = ofpbuf_new(strlen(hex) / 2);
405 if (ofpbuf_put_hex(packet, hex, NULL)[0] != '\0') {
406 ofpbuf_delete(packet);
408 return "Trailing garbage in packet data";
411 if (packet->size < ETH_HEADER_LEN) {
412 ofpbuf_delete(packet);
414 return "Packet data too short for Ethernet";
421 eth_format_masked(const uint8_t eth[ETH_ADDR_LEN],
422 const uint8_t mask[ETH_ADDR_LEN], struct ds *s)
424 ds_put_format(s, ETH_ADDR_FMT, ETH_ADDR_ARGS(eth));
425 if (mask && !eth_mask_is_exact(mask)) {
426 ds_put_format(s, "/"ETH_ADDR_FMT, ETH_ADDR_ARGS(mask));
431 eth_addr_bitand(const uint8_t src[ETH_ADDR_LEN],
432 const uint8_t mask[ETH_ADDR_LEN],
433 uint8_t dst[ETH_ADDR_LEN])
437 for (i = 0; i < ETH_ADDR_LEN; i++) {
438 dst[i] = src[i] & mask[i];
442 /* Given the IP netmask 'netmask', returns the number of bits of the IP address
443 * that it specifies, that is, the number of 1-bits in 'netmask'.
445 * If 'netmask' is not a CIDR netmask (see ip_is_cidr()), the return value will
446 * still be in the valid range but isn't otherwise meaningful. */
448 ip_count_cidr_bits(ovs_be32 netmask)
450 return 32 - ctz(ntohl(netmask));
454 ip_format_masked(ovs_be32 ip, ovs_be32 mask, struct ds *s)
456 ds_put_format(s, IP_FMT, IP_ARGS(ip));
457 if (mask != htonl(UINT32_MAX)) {
458 if (ip_is_cidr(mask)) {
459 ds_put_format(s, "/%d", ip_count_cidr_bits(mask));
461 ds_put_format(s, "/"IP_FMT, IP_ARGS(mask));
467 /* Stores the string representation of the IPv6 address 'addr' into the
468 * character array 'addr_str', which must be at least INET6_ADDRSTRLEN
471 format_ipv6_addr(char *addr_str, const struct in6_addr *addr)
473 inet_ntop(AF_INET6, addr, addr_str, INET6_ADDRSTRLEN);
477 print_ipv6_addr(struct ds *string, const struct in6_addr *addr)
481 ds_reserve(string, string->length + INET6_ADDRSTRLEN);
483 dst = string->string + string->length;
484 format_ipv6_addr(dst, addr);
485 string->length += strlen(dst);
489 print_ipv6_masked(struct ds *s, const struct in6_addr *addr,
490 const struct in6_addr *mask)
492 print_ipv6_addr(s, addr);
493 if (mask && !ipv6_mask_is_exact(mask)) {
494 if (ipv6_is_cidr(mask)) {
495 int cidr_bits = ipv6_count_cidr_bits(mask);
496 ds_put_format(s, "/%d", cidr_bits);
499 print_ipv6_addr(s, mask);
504 struct in6_addr ipv6_addr_bitand(const struct in6_addr *a,
505 const struct in6_addr *b)
511 for (i=0; i<4; i++) {
512 dst.s6_addr32[i] = a->s6_addr32[i] & b->s6_addr32[i];
515 for (i=0; i<16; i++) {
516 dst.s6_addr[i] = a->s6_addr[i] & b->s6_addr[i];
523 /* Returns an in6_addr consisting of 'mask' high-order 1-bits and 128-N
524 * low-order 0-bits. */
526 ipv6_create_mask(int mask)
528 struct in6_addr netmask;
529 uint8_t *netmaskp = &netmask.s6_addr[0];
531 memset(&netmask, 0, sizeof netmask);
539 *netmaskp = 0xff << (8 - mask);
545 /* Given the IPv6 netmask 'netmask', returns the number of bits of the IPv6
546 * address that it specifies, that is, the number of 1-bits in 'netmask'.
547 * 'netmask' must be a CIDR netmask (see ipv6_is_cidr()).
549 * If 'netmask' is not a CIDR netmask (see ipv6_is_cidr()), the return value
550 * will still be in the valid range but isn't otherwise meaningful. */
552 ipv6_count_cidr_bits(const struct in6_addr *netmask)
556 const uint8_t *netmaskp = &netmask->s6_addr[0];
558 for (i=0; i<16; i++) {
559 if (netmaskp[i] == 0xff) {
564 for(nm = netmaskp[i]; nm; nm <<= 1) {
575 /* Returns true if 'netmask' is a CIDR netmask, that is, if it consists of N
576 * high-order 1-bits and 128-N low-order 0-bits. */
578 ipv6_is_cidr(const struct in6_addr *netmask)
580 const uint8_t *netmaskp = &netmask->s6_addr[0];
583 for (i=0; i<16; i++) {
584 if (netmaskp[i] != 0xff) {
585 uint8_t x = ~netmaskp[i];
600 /* Populates 'b' with an Ethernet II packet headed with the given 'eth_dst',
601 * 'eth_src' and 'eth_type' parameters. A payload of 'size' bytes is allocated
602 * in 'b' and returned. This payload may be populated with appropriate
603 * information by the caller. Sets 'b''s 'l2' and 'l3' pointers to the
604 * Ethernet header and payload respectively.
606 * The returned packet has enough headroom to insert an 802.1Q VLAN header if
609 eth_compose(struct ofpbuf *b, const uint8_t eth_dst[ETH_ADDR_LEN],
610 const uint8_t eth_src[ETH_ADDR_LEN], uint16_t eth_type,
614 struct eth_header *eth;
618 ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + VLAN_HEADER_LEN + size);
619 ofpbuf_reserve(b, VLAN_HEADER_LEN);
620 eth = ofpbuf_put_uninit(b, ETH_HEADER_LEN);
621 data = ofpbuf_put_uninit(b, size);
623 memcpy(eth->eth_dst, eth_dst, ETH_ADDR_LEN);
624 memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
625 eth->eth_type = htons(eth_type);
634 packet_set_ipv4_addr(struct ofpbuf *packet, ovs_be32 *addr, ovs_be32 new_addr)
636 struct ip_header *nh = packet->l3;
638 if (nh->ip_proto == IPPROTO_TCP && packet->l7) {
639 struct tcp_header *th = packet->l4;
641 th->tcp_csum = recalc_csum32(th->tcp_csum, *addr, new_addr);
642 } else if (nh->ip_proto == IPPROTO_UDP && packet->l7) {
643 struct udp_header *uh = packet->l4;
646 uh->udp_csum = recalc_csum32(uh->udp_csum, *addr, new_addr);
648 uh->udp_csum = htons(0xffff);
652 nh->ip_csum = recalc_csum32(nh->ip_csum, *addr, new_addr);
656 /* Returns true, if packet contains at least one routing header where
657 * segements_left > 0.
659 * This function assumes that L3 and L4 markers are set in the packet. */
661 packet_rh_present(struct ofpbuf *packet)
663 const struct ip6_hdr *nh;
667 uint8_t *data = packet->l3;
669 remaining = (uint8_t *)packet->l4 - (uint8_t *)packet->l3;
671 if (remaining < sizeof *nh) {
674 nh = ALIGNED_CAST(struct ip6_hdr *, data);
676 remaining -= sizeof *nh;
677 nexthdr = nh->ip6_nxt;
680 if ((nexthdr != IPPROTO_HOPOPTS)
681 && (nexthdr != IPPROTO_ROUTING)
682 && (nexthdr != IPPROTO_DSTOPTS)
683 && (nexthdr != IPPROTO_AH)
684 && (nexthdr != IPPROTO_FRAGMENT)) {
685 /* It's either a terminal header (e.g., TCP, UDP) or one we
686 * don't understand. In either case, we're done with the
687 * packet, so use it to fill in 'nw_proto'. */
691 /* We only verify that at least 8 bytes of the next header are
692 * available, but many of these headers are longer. Ensure that
693 * accesses within the extension header are within those first 8
694 * bytes. All extension headers are required to be at least 8
700 if (nexthdr == IPPROTO_AH) {
701 /* A standard AH definition isn't available, but the fields
702 * we care about are in the same location as the generic
703 * option header--only the header length is calculated
705 const struct ip6_ext *ext_hdr = (struct ip6_ext *)data;
707 nexthdr = ext_hdr->ip6e_nxt;
708 len = (ext_hdr->ip6e_len + 2) * 4;
709 } else if (nexthdr == IPPROTO_FRAGMENT) {
710 const struct ip6_frag *frag_hdr = ALIGNED_CAST(struct ip6_frag *,
713 nexthdr = frag_hdr->ip6f_nxt;
714 len = sizeof *frag_hdr;
715 } else if (nexthdr == IPPROTO_ROUTING) {
716 const struct ip6_rthdr *rh = (struct ip6_rthdr *)data;
718 if (rh->ip6r_segleft > 0) {
722 nexthdr = rh->ip6r_nxt;
723 len = (rh->ip6r_len + 1) * 8;
725 const struct ip6_ext *ext_hdr = (struct ip6_ext *)data;
727 nexthdr = ext_hdr->ip6e_nxt;
728 len = (ext_hdr->ip6e_len + 1) * 8;
731 if (remaining < len) {
742 packet_update_csum128(struct ofpbuf *packet, uint8_t proto,
743 ovs_be32 addr[4], const ovs_be32 new_addr[4])
745 if (proto == IPPROTO_TCP && packet->l7) {
746 struct tcp_header *th = packet->l4;
748 th->tcp_csum = recalc_csum128(th->tcp_csum, addr, new_addr);
749 } else if (proto == IPPROTO_UDP && packet->l7) {
750 struct udp_header *uh = packet->l4;
753 uh->udp_csum = recalc_csum128(uh->udp_csum, addr, new_addr);
755 uh->udp_csum = htons(0xffff);
762 packet_set_ipv6_addr(struct ofpbuf *packet, uint8_t proto,
763 struct in6_addr *addr, const ovs_be32 new_addr[4],
764 bool recalculate_csum)
766 if (recalculate_csum) {
767 packet_update_csum128(packet, proto, (ovs_be32 *)addr, new_addr);
769 memcpy(addr, new_addr, sizeof(*addr));
773 packet_set_ipv6_flow_label(ovs_be32 *flow_label, ovs_be32 flow_key)
775 *flow_label = (*flow_label & htonl(~IPV6_LABEL_MASK)) | flow_key;
779 packet_set_ipv6_tc(ovs_be32 *flow_label, uint8_t tc)
781 *flow_label = (*flow_label & htonl(0xF00FFFFF)) | htonl(tc << 20);
784 /* Modifies the IPv4 header fields of 'packet' to be consistent with 'src',
785 * 'dst', 'tos', and 'ttl'. Updates 'packet''s L4 checksums as appropriate.
786 * 'packet' must contain a valid IPv4 packet with correctly populated l[347]
789 packet_set_ipv4(struct ofpbuf *packet, ovs_be32 src, ovs_be32 dst,
790 uint8_t tos, uint8_t ttl)
792 struct ip_header *nh = packet->l3;
794 if (nh->ip_src != src) {
795 packet_set_ipv4_addr(packet, &nh->ip_src, src);
798 if (nh->ip_dst != dst) {
799 packet_set_ipv4_addr(packet, &nh->ip_dst, dst);
802 if (nh->ip_tos != tos) {
803 uint8_t *field = &nh->ip_tos;
805 nh->ip_csum = recalc_csum16(nh->ip_csum, htons((uint16_t) *field),
806 htons((uint16_t) tos));
810 if (nh->ip_ttl != ttl) {
811 uint8_t *field = &nh->ip_ttl;
813 nh->ip_csum = recalc_csum16(nh->ip_csum, htons(*field << 8),
819 /* Modifies the IPv6 header fields of 'packet' to be consistent with 'src',
820 * 'dst', 'traffic class', and 'next hop'. Updates 'packet''s L4 checksums as
821 * appropriate. 'packet' must contain a valid IPv6 packet with correctly
822 * populated l[347] markers. */
824 packet_set_ipv6(struct ofpbuf *packet, uint8_t proto, const ovs_be32 src[4],
825 const ovs_be32 dst[4], uint8_t key_tc, ovs_be32 key_fl,
828 struct ip6_hdr *nh = packet->l3;
830 if (memcmp(&nh->ip6_src, src, sizeof(ovs_be32[4]))) {
831 packet_set_ipv6_addr(packet, proto, &nh->ip6_src, src, true);
834 if (memcmp(&nh->ip6_dst, dst, sizeof(ovs_be32[4]))) {
835 packet_set_ipv6_addr(packet, proto, &nh->ip6_dst, dst,
836 !packet_rh_present(packet));
839 packet_set_ipv6_tc(&nh->ip6_flow, key_tc);
841 packet_set_ipv6_flow_label(&nh->ip6_flow, key_fl);
843 nh->ip6_hlim = key_hl;
847 packet_set_port(ovs_be16 *port, ovs_be16 new_port, ovs_be16 *csum)
849 if (*port != new_port) {
850 *csum = recalc_csum16(*csum, *port, new_port);
855 /* Sets the TCP source and destination port ('src' and 'dst' respectively) of
856 * the TCP header contained in 'packet'. 'packet' must be a valid TCP packet
857 * with its l4 marker properly populated. */
859 packet_set_tcp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst)
861 struct tcp_header *th = packet->l4;
863 packet_set_port(&th->tcp_src, src, &th->tcp_csum);
864 packet_set_port(&th->tcp_dst, dst, &th->tcp_csum);
867 /* Sets the UDP source and destination port ('src' and 'dst' respectively) of
868 * the UDP header contained in 'packet'. 'packet' must be a valid UDP packet
869 * with its l4 marker properly populated. */
871 packet_set_udp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst)
873 struct udp_header *uh = packet->l4;
876 packet_set_port(&uh->udp_src, src, &uh->udp_csum);
877 packet_set_port(&uh->udp_dst, dst, &uh->udp_csum);
880 uh->udp_csum = htons(0xffff);
888 /* If 'packet' is a TCP packet, returns the TCP flags. Otherwise, returns 0.
890 * 'flow' must be the flow corresponding to 'packet' and 'packet''s header
891 * pointers must be properly initialized (e.g. with flow_extract()). */
893 packet_get_tcp_flags(const struct ofpbuf *packet, const struct flow *flow)
895 if (dl_type_is_ip_any(flow->dl_type) &&
896 flow->nw_proto == IPPROTO_TCP && packet->l7) {
897 const struct tcp_header *tcp = packet->l4;
898 return TCP_FLAGS(tcp->tcp_ctl);
904 /* Appends a string representation of the TCP flags value 'tcp_flags'
905 * (e.g. obtained via packet_get_tcp_flags() or TCP_FLAGS) to 's', in the
906 * format used by tcpdump. */
908 packet_format_tcp_flags(struct ds *s, uint8_t tcp_flags)
911 ds_put_cstr(s, "none");
915 if (tcp_flags & TCP_SYN) {
918 if (tcp_flags & TCP_FIN) {
921 if (tcp_flags & TCP_PSH) {
924 if (tcp_flags & TCP_RST) {
927 if (tcp_flags & TCP_URG) {
930 if (tcp_flags & TCP_ACK) {
933 if (tcp_flags & 0x40) {
934 ds_put_cstr(s, "[40]");
936 if (tcp_flags & 0x80) {
937 ds_put_cstr(s, "[80]");