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"
29 #include "dynamic-string.h"
31 #include "ovs-thread.h"
33 const struct in6_addr in6addr_exact = IN6ADDR_EXACT_INIT;
35 /* Parses 's' as a 16-digit hexadecimal number representing a datapath ID. On
36 * success stores the dpid into '*dpidp' and returns true, on failure stores 0
37 * into '*dpidp' and returns false.
39 * Rejects an all-zeros dpid as invalid. */
41 dpid_from_string(const char *s, uint64_t *dpidp)
43 *dpidp = (strlen(s) == 16 && strspn(s, "0123456789abcdefABCDEF") == 16
44 ? strtoull(s, NULL, 16)
49 /* Returns true if 'ea' is a reserved address, that a bridge must never
50 * forward, false otherwise.
52 * If you change this function's behavior, please update corresponding
53 * documentation in vswitch.xml at the same time. */
55 eth_addr_is_reserved(const uint8_t ea[ETH_ADDR_LEN])
57 struct eth_addr_node {
58 struct hmap_node hmap_node;
62 static struct eth_addr_node nodes[] = {
63 /* STP, IEEE pause frames, and other reserved protocols. */
64 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000000ULL },
65 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000001ULL },
66 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000002ULL },
67 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000003ULL },
68 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000004ULL },
69 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000005ULL },
70 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000006ULL },
71 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000007ULL },
72 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000008ULL },
73 { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000009ULL },
74 { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000aULL },
75 { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000bULL },
76 { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000cULL },
77 { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000dULL },
78 { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000eULL },
79 { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000fULL },
81 /* Extreme protocols. */
82 { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000000ULL }, /* EDP. */
83 { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000004ULL }, /* EAPS. */
84 { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000006ULL }, /* EAPS. */
86 /* Cisco protocols. */
87 { HMAP_NODE_NULL_INITIALIZER, 0x01000c000000ULL }, /* ISL. */
88 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccccULL }, /* PAgP, UDLD, CDP,
90 { HMAP_NODE_NULL_INITIALIZER, 0x01000ccccccdULL }, /* PVST+. */
91 { HMAP_NODE_NULL_INITIALIZER, 0x01000ccdcdcdULL }, /* STP Uplink Fast,
95 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc0ULL },
96 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc1ULL },
97 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc2ULL },
98 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc3ULL },
99 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc4ULL },
100 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc5ULL },
101 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc6ULL },
102 { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc7ULL },
105 static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
106 struct eth_addr_node *node;
107 static struct hmap addrs;
110 if (ovsthread_once_start(&once)) {
112 for (node = nodes; node < &nodes[ARRAY_SIZE(nodes)]; node++) {
113 hmap_insert(&addrs, &node->hmap_node,
114 hash_2words(node->ea64, node->ea64 >> 32));
116 ovsthread_once_done(&once);
119 ea64 = eth_addr_to_uint64(ea);
120 HMAP_FOR_EACH_IN_BUCKET (node, hmap_node, hash_2words(ea64, ea64 >> 32),
122 if (node->ea64 == ea64) {
130 eth_addr_from_string(const char *s, uint8_t ea[ETH_ADDR_LEN])
132 if (sscanf(s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(ea))
133 == ETH_ADDR_SCAN_COUNT) {
136 memset(ea, 0, ETH_ADDR_LEN);
141 /* Fills 'b' with a Reverse ARP packet with Ethernet source address 'eth_src'.
142 * This function is used by Open vSwitch to compose packets in cases where
143 * context is important but content doesn't (or shouldn't) matter.
145 * The returned packet has enough headroom to insert an 802.1Q VLAN header if
148 compose_rarp(struct ofpbuf *b, const uint8_t eth_src[ETH_ADDR_LEN])
150 struct eth_header *eth;
151 struct arp_eth_header *arp;
154 ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + VLAN_HEADER_LEN
155 + ARP_ETH_HEADER_LEN);
156 ofpbuf_reserve(b, VLAN_HEADER_LEN);
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);
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);
169 arp->ar_spa = htonl(0);
170 memcpy(arp->ar_tha, eth_src, ETH_ADDR_LEN);
171 arp->ar_tpa = htonl(0);
174 /* Insert VLAN header according to given TCI. Packet passed must be Ethernet
175 * packet. Ignores the CFI bit of 'tci' using 0 instead.
177 * Also sets 'packet->l2' to point to the new Ethernet header. */
179 eth_push_vlan(struct ofpbuf *packet, ovs_be16 tci)
181 struct eth_header *eh = packet->data;
182 struct vlan_eth_header *veh;
184 /* Insert new 802.1Q header. */
185 struct vlan_eth_header tmp;
186 memcpy(tmp.veth_dst, eh->eth_dst, ETH_ADDR_LEN);
187 memcpy(tmp.veth_src, eh->eth_src, ETH_ADDR_LEN);
188 tmp.veth_type = htons(ETH_TYPE_VLAN);
189 tmp.veth_tci = tci & htons(~VLAN_CFI);
190 tmp.veth_next_type = eh->eth_type;
192 veh = ofpbuf_push_uninit(packet, VLAN_HEADER_LEN);
193 memcpy(veh, &tmp, sizeof tmp);
195 packet->l2 = packet->data;
198 /* Removes outermost VLAN header (if any is present) from 'packet'.
200 * 'packet->l2_5' should initially point to 'packet''s outer-most MPLS header
201 * or may be NULL if there are no MPLS headers. */
203 eth_pop_vlan(struct ofpbuf *packet)
205 struct vlan_eth_header *veh = packet->l2;
206 if (packet->size >= sizeof *veh
207 && veh->veth_type == htons(ETH_TYPE_VLAN)) {
208 struct eth_header tmp;
210 memcpy(tmp.eth_dst, veh->veth_dst, ETH_ADDR_LEN);
211 memcpy(tmp.eth_src, veh->veth_src, ETH_ADDR_LEN);
212 tmp.eth_type = veh->veth_next_type;
214 ofpbuf_pull(packet, VLAN_HEADER_LEN);
215 packet->l2 = (char*)packet->l2 + VLAN_HEADER_LEN;
216 memcpy(packet->data, &tmp, sizeof tmp);
220 /* Return depth of mpls stack.
222 * 'packet->l2_5' should initially point to 'packet''s outer-most MPLS header
223 * or may be NULL if there are no MPLS headers. */
225 eth_mpls_depth(const struct ofpbuf *packet)
227 struct mpls_hdr *mh = packet->l2_5;
235 while (packet->size >= ((char *)mh - (char *)packet->data) + sizeof *mh) {
237 if (mh->mpls_lse & htonl(MPLS_BOS_MASK)) {
246 /* Set ethertype of the packet. */
248 set_ethertype(struct ofpbuf *packet, ovs_be16 eth_type)
250 struct eth_header *eh = packet->data;
252 if (eh->eth_type == htons(ETH_TYPE_VLAN)) {
254 p = ALIGNED_CAST(ovs_be16 *,
255 (char *)(packet->l2_5 ? packet->l2_5 : packet->l3) - 2);
258 eh->eth_type = eth_type;
262 static bool is_mpls(struct ofpbuf *packet)
264 return packet->l2_5 != NULL;
267 /* Set time to live (TTL) of an MPLS label stack entry (LSE). */
269 set_mpls_lse_ttl(ovs_be32 *lse, uint8_t ttl)
271 *lse &= ~htonl(MPLS_TTL_MASK);
272 *lse |= htonl((ttl << MPLS_TTL_SHIFT) & MPLS_TTL_MASK);
275 /* Set traffic class (TC) of an MPLS label stack entry (LSE). */
277 set_mpls_lse_tc(ovs_be32 *lse, uint8_t tc)
279 *lse &= ~htonl(MPLS_TC_MASK);
280 *lse |= htonl((tc << MPLS_TC_SHIFT) & MPLS_TC_MASK);
283 /* Set label of an MPLS label stack entry (LSE). */
285 set_mpls_lse_label(ovs_be32 *lse, ovs_be32 label)
287 *lse &= ~htonl(MPLS_LABEL_MASK);
288 *lse |= htonl((ntohl(label) << MPLS_LABEL_SHIFT) & MPLS_LABEL_MASK);
291 /* Set bottom of stack (BoS) bit of an MPLS label stack entry (LSE). */
293 set_mpls_lse_bos(ovs_be32 *lse, uint8_t bos)
295 *lse &= ~htonl(MPLS_BOS_MASK);
296 *lse |= htonl((bos << MPLS_BOS_SHIFT) & MPLS_BOS_MASK);
299 /* Compose an MPLS label stack entry (LSE) from its components:
300 * label, traffic class (TC), time to live (TTL) and
301 * bottom of stack (BoS) bit. */
303 set_mpls_lse_values(uint8_t ttl, uint8_t tc, uint8_t bos, ovs_be32 label)
305 ovs_be32 lse = htonl(0);
306 set_mpls_lse_ttl(&lse, ttl);
307 set_mpls_lse_tc(&lse, tc);
308 set_mpls_lse_bos(&lse, bos);
309 set_mpls_lse_label(&lse, label);
313 /* Push an new MPLS stack entry onto the MPLS stack and adjust 'packet->l2' and
314 * 'packet->l2_5' accordingly. The new entry will be the outermost entry on
317 * Previous to calling this function, 'packet->l2_5' must be set; if the MPLS
318 * label to be pushed will be the first label in 'packet', then it should be
319 * the same as 'packet->l3'. */
321 push_mpls_lse(struct ofpbuf *packet, struct mpls_hdr *mh)
325 header = ofpbuf_push_uninit(packet, MPLS_HLEN);
326 len = (char *)packet->l2_5 - (char *)packet->l2;
327 memmove(header, packet->l2, len);
328 memcpy(header + len, mh, sizeof *mh);
329 packet->l2 = (char*)packet->l2 - MPLS_HLEN;
330 packet->l2_5 = (char*)packet->l2_5 - MPLS_HLEN;
333 /* Set MPLS label stack entry to outermost MPLS header.*/
335 set_mpls_lse(struct ofpbuf *packet, ovs_be32 mpls_lse)
337 struct mpls_hdr *mh = packet->l2_5;
339 /* Packet type should be MPLS to set label stack entry. */
340 if (is_mpls(packet)) {
341 /* Update mpls label stack entry. */
342 mh->mpls_lse = mpls_lse;
346 /* Push MPLS label stack entry 'lse' onto 'packet' as the the outermost MPLS
347 * header. If 'packet' does not already have any MPLS labels, then its
348 * Ethertype is changed to 'ethtype' (which must be an MPLS Ethertype). */
350 push_mpls(struct ofpbuf *packet, ovs_be16 ethtype, ovs_be32 lse)
354 if (!eth_type_mpls(ethtype)) {
358 if (!is_mpls(packet)) {
359 /* Set ethtype and MPLS label stack entry. */
360 set_ethertype(packet, ethtype);
361 packet->l2_5 = packet->l3;
364 /* Push new MPLS shim header onto packet. */
366 push_mpls_lse(packet, &mh);
369 /* If 'packet' is an MPLS packet, removes its outermost MPLS label stack entry.
370 * If the label that was removed was the only MPLS label, changes 'packet''s
371 * Ethertype to 'ethtype' (which ordinarily should not be an MPLS
374 pop_mpls(struct ofpbuf *packet, ovs_be16 ethtype)
376 struct mpls_hdr *mh = NULL;
378 if (is_mpls(packet)) {
381 len = (char*)packet->l2_5 - (char*)packet->l2;
382 set_ethertype(packet, ethtype);
383 if (mh->mpls_lse & htonl(MPLS_BOS_MASK)) {
386 packet->l2_5 = (char*)packet->l2_5 + MPLS_HLEN;
388 /* Shift the l2 header forward. */
389 memmove((char*)packet->data + MPLS_HLEN, packet->data, len);
390 packet->size -= MPLS_HLEN;
391 packet->data = (char*)packet->data + MPLS_HLEN;
392 packet->l2 = (char*)packet->l2 + MPLS_HLEN;
396 /* Converts hex digits in 'hex' to an Ethernet packet in '*packetp'. The
397 * caller must free '*packetp'. On success, returns NULL. On failure, returns
398 * an error message and stores NULL in '*packetp'. */
400 eth_from_hex(const char *hex, struct ofpbuf **packetp)
402 struct ofpbuf *packet;
404 packet = *packetp = ofpbuf_new(strlen(hex) / 2);
406 if (ofpbuf_put_hex(packet, hex, NULL)[0] != '\0') {
407 ofpbuf_delete(packet);
409 return "Trailing garbage in packet data";
412 if (packet->size < ETH_HEADER_LEN) {
413 ofpbuf_delete(packet);
415 return "Packet data too short for Ethernet";
422 eth_format_masked(const uint8_t eth[ETH_ADDR_LEN],
423 const uint8_t mask[ETH_ADDR_LEN], struct ds *s)
425 ds_put_format(s, ETH_ADDR_FMT, ETH_ADDR_ARGS(eth));
426 if (mask && !eth_mask_is_exact(mask)) {
427 ds_put_format(s, "/"ETH_ADDR_FMT, ETH_ADDR_ARGS(mask));
432 eth_addr_bitand(const uint8_t src[ETH_ADDR_LEN],
433 const uint8_t mask[ETH_ADDR_LEN],
434 uint8_t dst[ETH_ADDR_LEN])
438 for (i = 0; i < ETH_ADDR_LEN; i++) {
439 dst[i] = src[i] & mask[i];
443 /* Given the IP netmask 'netmask', returns the number of bits of the IP address
444 * that it specifies, that is, the number of 1-bits in 'netmask'.
446 * If 'netmask' is not a CIDR netmask (see ip_is_cidr()), the return value will
447 * still be in the valid range but isn't otherwise meaningful. */
449 ip_count_cidr_bits(ovs_be32 netmask)
451 return 32 - ctz(ntohl(netmask));
455 ip_format_masked(ovs_be32 ip, ovs_be32 mask, struct ds *s)
457 ds_put_format(s, IP_FMT, IP_ARGS(ip));
458 if (mask != htonl(UINT32_MAX)) {
459 if (ip_is_cidr(mask)) {
460 ds_put_format(s, "/%d", ip_count_cidr_bits(mask));
462 ds_put_format(s, "/"IP_FMT, IP_ARGS(mask));
468 /* Stores the string representation of the IPv6 address 'addr' into the
469 * character array 'addr_str', which must be at least INET6_ADDRSTRLEN
472 format_ipv6_addr(char *addr_str, const struct in6_addr *addr)
474 inet_ntop(AF_INET6, addr, addr_str, INET6_ADDRSTRLEN);
478 print_ipv6_addr(struct ds *string, const struct in6_addr *addr)
482 ds_reserve(string, string->length + INET6_ADDRSTRLEN);
484 dst = string->string + string->length;
485 format_ipv6_addr(dst, addr);
486 string->length += strlen(dst);
490 print_ipv6_masked(struct ds *s, const struct in6_addr *addr,
491 const struct in6_addr *mask)
493 print_ipv6_addr(s, addr);
494 if (mask && !ipv6_mask_is_exact(mask)) {
495 if (ipv6_is_cidr(mask)) {
496 int cidr_bits = ipv6_count_cidr_bits(mask);
497 ds_put_format(s, "/%d", cidr_bits);
500 print_ipv6_addr(s, mask);
505 struct in6_addr ipv6_addr_bitand(const struct in6_addr *a,
506 const struct in6_addr *b)
512 for (i=0; i<4; i++) {
513 dst.s6_addr32[i] = a->s6_addr32[i] & b->s6_addr32[i];
516 for (i=0; i<16; i++) {
517 dst.s6_addr[i] = a->s6_addr[i] & b->s6_addr[i];
524 /* Returns an in6_addr consisting of 'mask' high-order 1-bits and 128-N
525 * low-order 0-bits. */
527 ipv6_create_mask(int mask)
529 struct in6_addr netmask;
530 uint8_t *netmaskp = &netmask.s6_addr[0];
532 memset(&netmask, 0, sizeof netmask);
540 *netmaskp = 0xff << (8 - mask);
546 /* Given the IPv6 netmask 'netmask', returns the number of bits of the IPv6
547 * address that it specifies, that is, the number of 1-bits in 'netmask'.
548 * 'netmask' must be a CIDR netmask (see ipv6_is_cidr()).
550 * If 'netmask' is not a CIDR netmask (see ipv6_is_cidr()), the return value
551 * will still be in the valid range but isn't otherwise meaningful. */
553 ipv6_count_cidr_bits(const struct in6_addr *netmask)
557 const uint8_t *netmaskp = &netmask->s6_addr[0];
559 for (i=0; i<16; i++) {
560 if (netmaskp[i] == 0xff) {
565 for(nm = netmaskp[i]; nm; nm <<= 1) {
576 /* Returns true if 'netmask' is a CIDR netmask, that is, if it consists of N
577 * high-order 1-bits and 128-N low-order 0-bits. */
579 ipv6_is_cidr(const struct in6_addr *netmask)
581 const uint8_t *netmaskp = &netmask->s6_addr[0];
584 for (i=0; i<16; i++) {
585 if (netmaskp[i] != 0xff) {
586 uint8_t x = ~netmaskp[i];
601 /* Populates 'b' with an Ethernet II packet headed with the given 'eth_dst',
602 * 'eth_src' and 'eth_type' parameters. A payload of 'size' bytes is allocated
603 * in 'b' and returned. This payload may be populated with appropriate
604 * information by the caller. Sets 'b''s 'l2' and 'l3' pointers to the
605 * Ethernet header and payload respectively.
607 * The returned packet has enough headroom to insert an 802.1Q VLAN header if
610 eth_compose(struct ofpbuf *b, const uint8_t eth_dst[ETH_ADDR_LEN],
611 const uint8_t eth_src[ETH_ADDR_LEN], uint16_t eth_type,
615 struct eth_header *eth;
619 ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + VLAN_HEADER_LEN + size);
620 ofpbuf_reserve(b, VLAN_HEADER_LEN);
621 eth = ofpbuf_put_uninit(b, ETH_HEADER_LEN);
622 data = ofpbuf_put_uninit(b, size);
624 memcpy(eth->eth_dst, eth_dst, ETH_ADDR_LEN);
625 memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
626 eth->eth_type = htons(eth_type);
635 packet_set_ipv4_addr(struct ofpbuf *packet, ovs_be32 *addr, ovs_be32 new_addr)
637 struct ip_header *nh = packet->l3;
639 if (nh->ip_proto == IPPROTO_TCP && packet->l7) {
640 struct tcp_header *th = packet->l4;
642 th->tcp_csum = recalc_csum32(th->tcp_csum, *addr, new_addr);
643 } else if (nh->ip_proto == IPPROTO_UDP && packet->l7) {
644 struct udp_header *uh = packet->l4;
647 uh->udp_csum = recalc_csum32(uh->udp_csum, *addr, new_addr);
649 uh->udp_csum = htons(0xffff);
653 nh->ip_csum = recalc_csum32(nh->ip_csum, *addr, new_addr);
657 /* Returns true, if packet contains at least one routing header where
658 * segements_left > 0.
660 * This function assumes that L3 and L4 markers are set in the packet. */
662 packet_rh_present(struct ofpbuf *packet)
664 const struct ip6_hdr *nh;
668 uint8_t *data = packet->l3;
670 remaining = (uint8_t *)packet->l4 - (uint8_t *)packet->l3;
672 if (remaining < sizeof *nh) {
675 nh = ALIGNED_CAST(struct ip6_hdr *, data);
677 remaining -= sizeof *nh;
678 nexthdr = nh->ip6_nxt;
681 if ((nexthdr != IPPROTO_HOPOPTS)
682 && (nexthdr != IPPROTO_ROUTING)
683 && (nexthdr != IPPROTO_DSTOPTS)
684 && (nexthdr != IPPROTO_AH)
685 && (nexthdr != IPPROTO_FRAGMENT)) {
686 /* It's either a terminal header (e.g., TCP, UDP) or one we
687 * don't understand. In either case, we're done with the
688 * packet, so use it to fill in 'nw_proto'. */
692 /* We only verify that at least 8 bytes of the next header are
693 * available, but many of these headers are longer. Ensure that
694 * accesses within the extension header are within those first 8
695 * bytes. All extension headers are required to be at least 8
701 if (nexthdr == IPPROTO_AH) {
702 /* A standard AH definition isn't available, but the fields
703 * we care about are in the same location as the generic
704 * option header--only the header length is calculated
706 const struct ip6_ext *ext_hdr = (struct ip6_ext *)data;
708 nexthdr = ext_hdr->ip6e_nxt;
709 len = (ext_hdr->ip6e_len + 2) * 4;
710 } else if (nexthdr == IPPROTO_FRAGMENT) {
711 const struct ip6_frag *frag_hdr = ALIGNED_CAST(struct ip6_frag *,
714 nexthdr = frag_hdr->ip6f_nxt;
715 len = sizeof *frag_hdr;
716 } else if (nexthdr == IPPROTO_ROUTING) {
717 const struct ip6_rthdr *rh = (struct ip6_rthdr *)data;
719 if (rh->ip6r_segleft > 0) {
723 nexthdr = rh->ip6r_nxt;
724 len = (rh->ip6r_len + 1) * 8;
726 const struct ip6_ext *ext_hdr = (struct ip6_ext *)data;
728 nexthdr = ext_hdr->ip6e_nxt;
729 len = (ext_hdr->ip6e_len + 1) * 8;
732 if (remaining < len) {
743 packet_update_csum128(struct ofpbuf *packet, uint8_t proto,
744 ovs_be32 addr[4], const ovs_be32 new_addr[4])
746 if (proto == IPPROTO_TCP && packet->l7) {
747 struct tcp_header *th = packet->l4;
749 th->tcp_csum = recalc_csum128(th->tcp_csum, addr, new_addr);
750 } else if (proto == IPPROTO_UDP && packet->l7) {
751 struct udp_header *uh = packet->l4;
754 uh->udp_csum = recalc_csum128(uh->udp_csum, addr, new_addr);
756 uh->udp_csum = htons(0xffff);
763 packet_set_ipv6_addr(struct ofpbuf *packet, uint8_t proto,
764 struct in6_addr *addr, const ovs_be32 new_addr[4],
765 bool recalculate_csum)
767 if (recalculate_csum) {
768 packet_update_csum128(packet, proto, (ovs_be32 *)addr, new_addr);
770 memcpy(addr, new_addr, sizeof(*addr));
774 packet_set_ipv6_flow_label(ovs_be32 *flow_label, ovs_be32 flow_key)
776 *flow_label = (*flow_label & htonl(~IPV6_LABEL_MASK)) | flow_key;
780 packet_set_ipv6_tc(ovs_be32 *flow_label, uint8_t tc)
782 *flow_label = (*flow_label & htonl(0xF00FFFFF)) | htonl(tc << 20);
785 /* Modifies the IPv4 header fields of 'packet' to be consistent with 'src',
786 * 'dst', 'tos', and 'ttl'. Updates 'packet''s L4 checksums as appropriate.
787 * 'packet' must contain a valid IPv4 packet with correctly populated l[347]
790 packet_set_ipv4(struct ofpbuf *packet, ovs_be32 src, ovs_be32 dst,
791 uint8_t tos, uint8_t ttl)
793 struct ip_header *nh = packet->l3;
795 if (nh->ip_src != src) {
796 packet_set_ipv4_addr(packet, &nh->ip_src, src);
799 if (nh->ip_dst != dst) {
800 packet_set_ipv4_addr(packet, &nh->ip_dst, dst);
803 if (nh->ip_tos != tos) {
804 uint8_t *field = &nh->ip_tos;
806 nh->ip_csum = recalc_csum16(nh->ip_csum, htons((uint16_t) *field),
807 htons((uint16_t) tos));
811 if (nh->ip_ttl != ttl) {
812 uint8_t *field = &nh->ip_ttl;
814 nh->ip_csum = recalc_csum16(nh->ip_csum, htons(*field << 8),
820 /* Modifies the IPv6 header fields of 'packet' to be consistent with 'src',
821 * 'dst', 'traffic class', and 'next hop'. Updates 'packet''s L4 checksums as
822 * appropriate. 'packet' must contain a valid IPv6 packet with correctly
823 * populated l[347] markers. */
825 packet_set_ipv6(struct ofpbuf *packet, uint8_t proto, const ovs_be32 src[4],
826 const ovs_be32 dst[4], uint8_t key_tc, ovs_be32 key_fl,
829 struct ip6_hdr *nh = packet->l3;
831 if (memcmp(&nh->ip6_src, src, sizeof(ovs_be32[4]))) {
832 packet_set_ipv6_addr(packet, proto, &nh->ip6_src, src, true);
835 if (memcmp(&nh->ip6_dst, dst, sizeof(ovs_be32[4]))) {
836 packet_set_ipv6_addr(packet, proto, &nh->ip6_dst, dst,
837 !packet_rh_present(packet));
840 packet_set_ipv6_tc(&nh->ip6_flow, key_tc);
842 packet_set_ipv6_flow_label(&nh->ip6_flow, key_fl);
844 nh->ip6_hlim = key_hl;
848 packet_set_port(ovs_be16 *port, ovs_be16 new_port, ovs_be16 *csum)
850 if (*port != new_port) {
851 *csum = recalc_csum16(*csum, *port, new_port);
856 /* Sets the TCP source and destination port ('src' and 'dst' respectively) of
857 * the TCP header contained in 'packet'. 'packet' must be a valid TCP packet
858 * with its l4 marker properly populated. */
860 packet_set_tcp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst)
862 struct tcp_header *th = packet->l4;
864 packet_set_port(&th->tcp_src, src, &th->tcp_csum);
865 packet_set_port(&th->tcp_dst, dst, &th->tcp_csum);
868 /* Sets the UDP source and destination port ('src' and 'dst' respectively) of
869 * the UDP header contained in 'packet'. 'packet' must be a valid UDP packet
870 * with its l4 marker properly populated. */
872 packet_set_udp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst)
874 struct udp_header *uh = packet->l4;
877 packet_set_port(&uh->udp_src, src, &uh->udp_csum);
878 packet_set_port(&uh->udp_dst, dst, &uh->udp_csum);
881 uh->udp_csum = htons(0xffff);
889 /* Sets the SCTP source and destination port ('src' and 'dst' respectively) of
890 * the SCTP header contained in 'packet'. 'packet' must be a valid SCTP packet
891 * with its l4 marker properly populated. */
893 packet_set_sctp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst)
895 struct sctp_header *sh = packet->l4;
896 ovs_be32 old_csum, old_correct_csum, new_csum;
897 uint16_t tp_len = packet->size - ((uint8_t*)sh - (uint8_t*)packet->data);
899 old_csum = sh->sctp_csum;
901 old_correct_csum = crc32c(packet->l4, tp_len);
906 new_csum = crc32c(packet->l4, tp_len);
907 sh->sctp_csum = old_csum ^ old_correct_csum ^ new_csum;
910 /* If 'packet' is a TCP packet, returns the TCP flags. Otherwise, returns 0.
912 * 'flow' must be the flow corresponding to 'packet' and 'packet''s header
913 * pointers must be properly initialized (e.g. with flow_extract()). */
915 packet_get_tcp_flags(const struct ofpbuf *packet, const struct flow *flow)
917 if (dl_type_is_ip_any(flow->dl_type) &&
918 flow->nw_proto == IPPROTO_TCP && packet->l7) {
919 const struct tcp_header *tcp = packet->l4;
920 return TCP_FLAGS(tcp->tcp_ctl);
926 /* Appends a string representation of the TCP flags value 'tcp_flags'
927 * (e.g. obtained via packet_get_tcp_flags() or TCP_FLAGS) to 's', in the
928 * format used by tcpdump. */
930 packet_format_tcp_flags(struct ds *s, uint8_t tcp_flags)
933 ds_put_cstr(s, "none");
937 if (tcp_flags & TCP_SYN) {
940 if (tcp_flags & TCP_FIN) {
943 if (tcp_flags & TCP_PSH) {
946 if (tcp_flags & TCP_RST) {
949 if (tcp_flags & TCP_URG) {
952 if (tcp_flags & TCP_ACK) {
955 if (tcp_flags & 0x40) {
956 ds_put_cstr(s, "[40]");
958 if (tcp_flags & 0x80) {
959 ds_put_cstr(s, "[80]");