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 = (ovs_be16 *)((char *)(packet->l2_5 ? packet->l2_5 : packet->l3) - 2);
256 eh->eth_type = eth_type;
260 static bool is_mpls(struct ofpbuf *packet)
262 return packet->l2_5 != NULL;
265 /* Set time to live (TTL) of an MPLS label stack entry (LSE). */
267 set_mpls_lse_ttl(ovs_be32 *lse, uint8_t ttl)
269 *lse &= ~htonl(MPLS_TTL_MASK);
270 *lse |= htonl((ttl << MPLS_TTL_SHIFT) & MPLS_TTL_MASK);
273 /* Set traffic class (TC) of an MPLS label stack entry (LSE). */
275 set_mpls_lse_tc(ovs_be32 *lse, uint8_t tc)
277 *lse &= ~htonl(MPLS_TC_MASK);
278 *lse |= htonl((tc << MPLS_TC_SHIFT) & MPLS_TC_MASK);
281 /* Set label of an MPLS label stack entry (LSE). */
283 set_mpls_lse_label(ovs_be32 *lse, ovs_be32 label)
285 *lse &= ~htonl(MPLS_LABEL_MASK);
286 *lse |= htonl((ntohl(label) << MPLS_LABEL_SHIFT) & MPLS_LABEL_MASK);
289 /* Set bottom of stack (BoS) bit of an MPLS label stack entry (LSE). */
291 set_mpls_lse_bos(ovs_be32 *lse, uint8_t bos)
293 *lse &= ~htonl(MPLS_BOS_MASK);
294 *lse |= htonl((bos << MPLS_BOS_SHIFT) & MPLS_BOS_MASK);
297 /* Compose an MPLS label stack entry (LSE) from its components:
298 * label, traffic class (TC), time to live (TTL) and
299 * bottom of stack (BoS) bit. */
301 set_mpls_lse_values(uint8_t ttl, uint8_t tc, uint8_t bos, ovs_be32 label)
303 ovs_be32 lse = htonl(0);
304 set_mpls_lse_ttl(&lse, ttl);
305 set_mpls_lse_tc(&lse, tc);
306 set_mpls_lse_bos(&lse, bos);
307 set_mpls_lse_label(&lse, label);
311 /* Push an new MPLS stack entry onto the MPLS stack and adjust 'packet->l2' and
312 * 'packet->l2_5' accordingly. The new entry will be the outermost entry on
315 * Previous to calling this function, 'packet->l2_5' must be set; if the MPLS
316 * label to be pushed will be the first label in 'packet', then it should be
317 * the same as 'packet->l3'. */
319 push_mpls_lse(struct ofpbuf *packet, struct mpls_hdr *mh)
323 header = ofpbuf_push_uninit(packet, MPLS_HLEN);
324 len = (char *)packet->l2_5 - (char *)packet->l2;
325 memmove(header, packet->l2, len);
326 memcpy(header + len, mh, sizeof *mh);
327 packet->l2 = (char*)packet->l2 - MPLS_HLEN;
328 packet->l2_5 = (char*)packet->l2_5 - MPLS_HLEN;
331 /* Set MPLS label stack entry to outermost MPLS header.*/
333 set_mpls_lse(struct ofpbuf *packet, ovs_be32 mpls_lse)
335 struct mpls_hdr *mh = packet->l2_5;
337 /* Packet type should be MPLS to set label stack entry. */
338 if (is_mpls(packet)) {
339 /* Update mpls label stack entry. */
340 mh->mpls_lse = mpls_lse;
344 /* Push MPLS label stack entry 'lse' onto 'packet' as the the outermost MPLS
345 * header. If 'packet' does not already have any MPLS labels, then its
346 * Ethertype is changed to 'ethtype' (which must be an MPLS Ethertype). */
348 push_mpls(struct ofpbuf *packet, ovs_be16 ethtype, ovs_be32 lse)
352 if (!eth_type_mpls(ethtype)) {
356 if (!is_mpls(packet)) {
357 /* Set ethtype and MPLS label stack entry. */
358 set_ethertype(packet, ethtype);
359 packet->l2_5 = packet->l3;
362 /* Push new MPLS shim header onto packet. */
364 push_mpls_lse(packet, &mh);
367 /* If 'packet' is an MPLS packet, removes its outermost MPLS label stack entry.
368 * If the label that was removed was the only MPLS label, changes 'packet''s
369 * Ethertype to 'ethtype' (which ordinarily should not be an MPLS
372 pop_mpls(struct ofpbuf *packet, ovs_be16 ethtype)
374 struct mpls_hdr *mh = NULL;
376 if (is_mpls(packet)) {
379 len = (char*)packet->l2_5 - (char*)packet->l2;
380 set_ethertype(packet, ethtype);
381 if (mh->mpls_lse & htonl(MPLS_BOS_MASK)) {
384 packet->l2_5 = (char*)packet->l2_5 + MPLS_HLEN;
386 /* Shift the l2 header forward. */
387 memmove((char*)packet->data + MPLS_HLEN, packet->data, len);
388 packet->size -= MPLS_HLEN;
389 packet->data = (char*)packet->data + MPLS_HLEN;
390 packet->l2 = (char*)packet->l2 + MPLS_HLEN;
394 /* Converts hex digits in 'hex' to an Ethernet packet in '*packetp'. The
395 * caller must free '*packetp'. On success, returns NULL. On failure, returns
396 * an error message and stores NULL in '*packetp'. */
398 eth_from_hex(const char *hex, struct ofpbuf **packetp)
400 struct ofpbuf *packet;
402 packet = *packetp = ofpbuf_new(strlen(hex) / 2);
404 if (ofpbuf_put_hex(packet, hex, NULL)[0] != '\0') {
405 ofpbuf_delete(packet);
407 return "Trailing garbage in packet data";
410 if (packet->size < ETH_HEADER_LEN) {
411 ofpbuf_delete(packet);
413 return "Packet data too short for Ethernet";
420 eth_format_masked(const uint8_t eth[ETH_ADDR_LEN],
421 const uint8_t mask[ETH_ADDR_LEN], struct ds *s)
423 ds_put_format(s, ETH_ADDR_FMT, ETH_ADDR_ARGS(eth));
424 if (mask && !eth_mask_is_exact(mask)) {
425 ds_put_format(s, "/"ETH_ADDR_FMT, ETH_ADDR_ARGS(mask));
430 eth_addr_bitand(const uint8_t src[ETH_ADDR_LEN],
431 const uint8_t mask[ETH_ADDR_LEN],
432 uint8_t dst[ETH_ADDR_LEN])
436 for (i = 0; i < ETH_ADDR_LEN; i++) {
437 dst[i] = src[i] & mask[i];
441 /* Given the IP netmask 'netmask', returns the number of bits of the IP address
442 * that it specifies, that is, the number of 1-bits in 'netmask'.
444 * If 'netmask' is not a CIDR netmask (see ip_is_cidr()), the return value will
445 * still be in the valid range but isn't otherwise meaningful. */
447 ip_count_cidr_bits(ovs_be32 netmask)
449 return 32 - ctz(ntohl(netmask));
453 ip_format_masked(ovs_be32 ip, ovs_be32 mask, struct ds *s)
455 ds_put_format(s, IP_FMT, IP_ARGS(ip));
456 if (mask != htonl(UINT32_MAX)) {
457 if (ip_is_cidr(mask)) {
458 ds_put_format(s, "/%d", ip_count_cidr_bits(mask));
460 ds_put_format(s, "/"IP_FMT, IP_ARGS(mask));
466 /* Stores the string representation of the IPv6 address 'addr' into the
467 * character array 'addr_str', which must be at least INET6_ADDRSTRLEN
470 format_ipv6_addr(char *addr_str, const struct in6_addr *addr)
472 inet_ntop(AF_INET6, addr, addr_str, INET6_ADDRSTRLEN);
476 print_ipv6_addr(struct ds *string, const struct in6_addr *addr)
480 ds_reserve(string, string->length + INET6_ADDRSTRLEN);
482 dst = string->string + string->length;
483 format_ipv6_addr(dst, addr);
484 string->length += strlen(dst);
488 print_ipv6_masked(struct ds *s, const struct in6_addr *addr,
489 const struct in6_addr *mask)
491 print_ipv6_addr(s, addr);
492 if (mask && !ipv6_mask_is_exact(mask)) {
493 if (ipv6_is_cidr(mask)) {
494 int cidr_bits = ipv6_count_cidr_bits(mask);
495 ds_put_format(s, "/%d", cidr_bits);
498 print_ipv6_addr(s, mask);
503 struct in6_addr ipv6_addr_bitand(const struct in6_addr *a,
504 const struct in6_addr *b)
510 for (i=0; i<4; i++) {
511 dst.s6_addr32[i] = a->s6_addr32[i] & b->s6_addr32[i];
514 for (i=0; i<16; i++) {
515 dst.s6_addr[i] = a->s6_addr[i] & b->s6_addr[i];
522 /* Returns an in6_addr consisting of 'mask' high-order 1-bits and 128-N
523 * low-order 0-bits. */
525 ipv6_create_mask(int mask)
527 struct in6_addr netmask;
528 uint8_t *netmaskp = &netmask.s6_addr[0];
530 memset(&netmask, 0, sizeof netmask);
538 *netmaskp = 0xff << (8 - mask);
544 /* Given the IPv6 netmask 'netmask', returns the number of bits of the IPv6
545 * address that it specifies, that is, the number of 1-bits in 'netmask'.
546 * 'netmask' must be a CIDR netmask (see ipv6_is_cidr()).
548 * If 'netmask' is not a CIDR netmask (see ipv6_is_cidr()), the return value
549 * will still be in the valid range but isn't otherwise meaningful. */
551 ipv6_count_cidr_bits(const struct in6_addr *netmask)
555 const uint8_t *netmaskp = &netmask->s6_addr[0];
557 for (i=0; i<16; i++) {
558 if (netmaskp[i] == 0xff) {
563 for(nm = netmaskp[i]; nm; nm <<= 1) {
574 /* Returns true if 'netmask' is a CIDR netmask, that is, if it consists of N
575 * high-order 1-bits and 128-N low-order 0-bits. */
577 ipv6_is_cidr(const struct in6_addr *netmask)
579 const uint8_t *netmaskp = &netmask->s6_addr[0];
582 for (i=0; i<16; i++) {
583 if (netmaskp[i] != 0xff) {
584 uint8_t x = ~netmaskp[i];
599 /* Populates 'b' with an Ethernet II packet headed with the given 'eth_dst',
600 * 'eth_src' and 'eth_type' parameters. A payload of 'size' bytes is allocated
601 * in 'b' and returned. This payload may be populated with appropriate
602 * information by the caller. Sets 'b''s 'l2' and 'l3' pointers to the
603 * Ethernet header and payload respectively.
605 * The returned packet has enough headroom to insert an 802.1Q VLAN header if
608 eth_compose(struct ofpbuf *b, const uint8_t eth_dst[ETH_ADDR_LEN],
609 const uint8_t eth_src[ETH_ADDR_LEN], uint16_t eth_type,
613 struct eth_header *eth;
617 ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + VLAN_HEADER_LEN + size);
618 ofpbuf_reserve(b, VLAN_HEADER_LEN);
619 eth = ofpbuf_put_uninit(b, ETH_HEADER_LEN);
620 data = ofpbuf_put_uninit(b, size);
622 memcpy(eth->eth_dst, eth_dst, ETH_ADDR_LEN);
623 memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
624 eth->eth_type = htons(eth_type);
633 packet_set_ipv4_addr(struct ofpbuf *packet, ovs_be32 *addr, ovs_be32 new_addr)
635 struct ip_header *nh = packet->l3;
637 if (nh->ip_proto == IPPROTO_TCP && packet->l7) {
638 struct tcp_header *th = packet->l4;
640 th->tcp_csum = recalc_csum32(th->tcp_csum, *addr, new_addr);
641 } else if (nh->ip_proto == IPPROTO_UDP && packet->l7) {
642 struct udp_header *uh = packet->l4;
645 uh->udp_csum = recalc_csum32(uh->udp_csum, *addr, new_addr);
647 uh->udp_csum = htons(0xffff);
651 nh->ip_csum = recalc_csum32(nh->ip_csum, *addr, new_addr);
655 /* Returns true, if packet contains at least one routing header where
656 * segements_left > 0.
658 * This function assumes that L3 and L4 markers are set in the packet. */
660 packet_rh_present(struct ofpbuf *packet)
662 const struct ip6_hdr *nh;
666 uint8_t *data = packet->l3;
668 remaining = (uint8_t *)packet->l4 - (uint8_t *)packet->l3;
670 if (remaining < sizeof *nh) {
673 nh = (struct ip6_hdr *)data;
675 remaining -= sizeof *nh;
676 nexthdr = nh->ip6_nxt;
679 if ((nexthdr != IPPROTO_HOPOPTS)
680 && (nexthdr != IPPROTO_ROUTING)
681 && (nexthdr != IPPROTO_DSTOPTS)
682 && (nexthdr != IPPROTO_AH)
683 && (nexthdr != IPPROTO_FRAGMENT)) {
684 /* It's either a terminal header (e.g., TCP, UDP) or one we
685 * don't understand. In either case, we're done with the
686 * packet, so use it to fill in 'nw_proto'. */
690 /* We only verify that at least 8 bytes of the next header are
691 * available, but many of these headers are longer. Ensure that
692 * accesses within the extension header are within those first 8
693 * bytes. All extension headers are required to be at least 8
699 if (nexthdr == IPPROTO_AH) {
700 /* A standard AH definition isn't available, but the fields
701 * we care about are in the same location as the generic
702 * option header--only the header length is calculated
704 const struct ip6_ext *ext_hdr = (struct ip6_ext *)data;
706 nexthdr = ext_hdr->ip6e_nxt;
707 len = (ext_hdr->ip6e_len + 2) * 4;
708 } else if (nexthdr == IPPROTO_FRAGMENT) {
709 const struct ip6_frag *frag_hdr = (struct ip6_frag *)data;
711 nexthdr = frag_hdr->ip6f_nxt;
712 len = sizeof *frag_hdr;
713 } else if (nexthdr == IPPROTO_ROUTING) {
714 const struct ip6_rthdr *rh = (struct ip6_rthdr *)data;
716 if (rh->ip6r_segleft > 0) {
720 nexthdr = rh->ip6r_nxt;
721 len = (rh->ip6r_len + 1) * 8;
723 const struct ip6_ext *ext_hdr = (struct ip6_ext *)data;
725 nexthdr = ext_hdr->ip6e_nxt;
726 len = (ext_hdr->ip6e_len + 1) * 8;
729 if (remaining < len) {
740 packet_update_csum128(struct ofpbuf *packet, uint8_t proto,
741 ovs_be32 addr[4], const ovs_be32 new_addr[4])
743 if (proto == IPPROTO_TCP && packet->l7) {
744 struct tcp_header *th = packet->l4;
746 th->tcp_csum = recalc_csum128(th->tcp_csum, addr, new_addr);
747 } else if (proto == IPPROTO_UDP && packet->l7) {
748 struct udp_header *uh = packet->l4;
751 uh->udp_csum = recalc_csum128(uh->udp_csum, addr, new_addr);
753 uh->udp_csum = htons(0xffff);
760 packet_set_ipv6_addr(struct ofpbuf *packet, uint8_t proto,
761 struct in6_addr *addr, const ovs_be32 new_addr[4],
762 bool recalculate_csum)
764 if (recalculate_csum) {
765 packet_update_csum128(packet, proto, (ovs_be32 *)addr, new_addr);
767 memcpy(addr, new_addr, sizeof(*addr));
771 packet_set_ipv6_flow_label(ovs_be32 *flow_label, ovs_be32 flow_key)
773 *flow_label = (*flow_label & htonl(~IPV6_LABEL_MASK)) | flow_key;
777 packet_set_ipv6_tc(ovs_be32 *flow_label, uint8_t tc)
779 *flow_label = (*flow_label & htonl(0xF00FFFFF)) | htonl(tc << 20);
782 /* Modifies the IPv4 header fields of 'packet' to be consistent with 'src',
783 * 'dst', 'tos', and 'ttl'. Updates 'packet''s L4 checksums as appropriate.
784 * 'packet' must contain a valid IPv4 packet with correctly populated l[347]
787 packet_set_ipv4(struct ofpbuf *packet, ovs_be32 src, ovs_be32 dst,
788 uint8_t tos, uint8_t ttl)
790 struct ip_header *nh = packet->l3;
792 if (nh->ip_src != src) {
793 packet_set_ipv4_addr(packet, &nh->ip_src, src);
796 if (nh->ip_dst != dst) {
797 packet_set_ipv4_addr(packet, &nh->ip_dst, dst);
800 if (nh->ip_tos != tos) {
801 uint8_t *field = &nh->ip_tos;
803 nh->ip_csum = recalc_csum16(nh->ip_csum, htons((uint16_t) *field),
804 htons((uint16_t) tos));
808 if (nh->ip_ttl != ttl) {
809 uint8_t *field = &nh->ip_ttl;
811 nh->ip_csum = recalc_csum16(nh->ip_csum, htons(*field << 8),
817 /* Modifies the IPv6 header fields of 'packet' to be consistent with 'src',
818 * 'dst', 'traffic class', and 'next hop'. Updates 'packet''s L4 checksums as
819 * appropriate. 'packet' must contain a valid IPv6 packet with correctly
820 * populated l[347] markers. */
822 packet_set_ipv6(struct ofpbuf *packet, uint8_t proto, const ovs_be32 src[4],
823 const ovs_be32 dst[4], uint8_t key_tc, ovs_be32 key_fl,
826 struct ip6_hdr *nh = packet->l3;
828 if (memcmp(&nh->ip6_src, src, sizeof(ovs_be32[4]))) {
829 packet_set_ipv6_addr(packet, proto, &nh->ip6_src, src, true);
832 if (memcmp(&nh->ip6_dst, dst, sizeof(ovs_be32[4]))) {
833 packet_set_ipv6_addr(packet, proto, &nh->ip6_dst, dst,
834 !packet_rh_present(packet));
837 packet_set_ipv6_tc(&nh->ip6_flow, key_tc);
839 packet_set_ipv6_flow_label(&nh->ip6_flow, key_fl);
841 nh->ip6_hlim = key_hl;
845 packet_set_port(ovs_be16 *port, ovs_be16 new_port, ovs_be16 *csum)
847 if (*port != new_port) {
848 *csum = recalc_csum16(*csum, *port, new_port);
853 /* Sets the TCP source and destination port ('src' and 'dst' respectively) of
854 * the TCP header contained in 'packet'. 'packet' must be a valid TCP packet
855 * with its l4 marker properly populated. */
857 packet_set_tcp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst)
859 struct tcp_header *th = packet->l4;
861 packet_set_port(&th->tcp_src, src, &th->tcp_csum);
862 packet_set_port(&th->tcp_dst, dst, &th->tcp_csum);
865 /* Sets the UDP source and destination port ('src' and 'dst' respectively) of
866 * the UDP header contained in 'packet'. 'packet' must be a valid UDP packet
867 * with its l4 marker properly populated. */
869 packet_set_udp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst)
871 struct udp_header *uh = packet->l4;
874 packet_set_port(&uh->udp_src, src, &uh->udp_csum);
875 packet_set_port(&uh->udp_dst, dst, &uh->udp_csum);
878 uh->udp_csum = htons(0xffff);
886 /* If 'packet' is a TCP packet, returns the TCP flags. Otherwise, returns 0.
888 * 'flow' must be the flow corresponding to 'packet' and 'packet''s header
889 * pointers must be properly initialized (e.g. with flow_extract()). */
891 packet_get_tcp_flags(const struct ofpbuf *packet, const struct flow *flow)
893 if (dl_type_is_ip_any(flow->dl_type) &&
894 flow->nw_proto == IPPROTO_TCP && packet->l7) {
895 const struct tcp_header *tcp = packet->l4;
896 return TCP_FLAGS(tcp->tcp_ctl);
902 /* Appends a string representation of the TCP flags value 'tcp_flags'
903 * (e.g. obtained via packet_get_tcp_flags() or TCP_FLAGS) to 's', in the
904 * format used by tcpdump. */
906 packet_format_tcp_flags(struct ds *s, uint8_t tcp_flags)
909 ds_put_cstr(s, "none");
913 if (tcp_flags & TCP_SYN) {
916 if (tcp_flags & TCP_FIN) {
919 if (tcp_flags & TCP_PSH) {
922 if (tcp_flags & TCP_RST) {
925 if (tcp_flags & TCP_URG) {
928 if (tcp_flags & TCP_ACK) {
931 if (tcp_flags & 0x40) {
932 ds_put_cstr(s, "[40]");
934 if (tcp_flags & 0x80) {
935 ds_put_cstr(s, "[80]");