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.
20 #include <arpa/inet.h>
21 #include <sys/socket.h>
22 #include <netinet/in.h>
23 #include <netinet/ip6.h>
25 #include "byte-order.h"
29 #include "dynamic-string.h"
31 #include "unaligned.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 hmap addrs = HMAP_INITIALIZER(&addrs);
106 struct eth_addr_node *node;
109 if (hmap_is_empty(&addrs)) {
110 for (node = nodes; node < &nodes[ARRAY_SIZE(nodes)]; node++) {
111 hmap_insert(&addrs, &node->hmap_node,
112 hash_2words(node->ea64, node->ea64 >> 32));
116 ea64 = eth_addr_to_uint64(ea);
117 HMAP_FOR_EACH_IN_BUCKET (node, hmap_node, hash_2words(ea64, ea64 >> 32),
119 if (node->ea64 == ea64) {
127 eth_addr_from_string(const char *s, uint8_t ea[ETH_ADDR_LEN])
129 if (sscanf(s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(ea))
130 == ETH_ADDR_SCAN_COUNT) {
133 memset(ea, 0, ETH_ADDR_LEN);
138 /* Fills 'b' with a Reverse ARP packet with Ethernet source address 'eth_src'.
139 * This function is used by Open vSwitch to compose packets in cases where
140 * context is important but content doesn't (or shouldn't) matter.
142 * The returned packet has enough headroom to insert an 802.1Q VLAN header if
145 compose_rarp(struct ofpbuf *b, const uint8_t eth_src[ETH_ADDR_LEN])
147 struct eth_header *eth;
148 struct arp_eth_header *arp;
151 ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + VLAN_HEADER_LEN
152 + ARP_ETH_HEADER_LEN);
153 ofpbuf_reserve(b, VLAN_HEADER_LEN);
154 eth = ofpbuf_put_uninit(b, sizeof *eth);
155 memcpy(eth->eth_dst, eth_addr_broadcast, ETH_ADDR_LEN);
156 memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
157 eth->eth_type = htons(ETH_TYPE_RARP);
159 arp = ofpbuf_put_uninit(b, sizeof *arp);
160 arp->ar_hrd = htons(ARP_HRD_ETHERNET);
161 arp->ar_pro = htons(ARP_PRO_IP);
162 arp->ar_hln = sizeof arp->ar_sha;
163 arp->ar_pln = sizeof arp->ar_spa;
164 arp->ar_op = htons(ARP_OP_RARP);
165 memcpy(arp->ar_sha, eth_src, ETH_ADDR_LEN);
166 put_16aligned_be32(&arp->ar_spa, htonl(0));
167 memcpy(arp->ar_tha, eth_src, ETH_ADDR_LEN);
168 put_16aligned_be32(&arp->ar_tpa, htonl(0));
171 /* Insert VLAN header according to given TCI. Packet passed must be Ethernet
172 * packet. Ignores the CFI bit of 'tci' using 0 instead.
174 * Also sets 'packet->l2' to point to the new Ethernet header. */
176 eth_push_vlan(struct ofpbuf *packet, ovs_be16 tci)
178 struct eth_header *eh = packet->data;
179 struct vlan_eth_header *veh;
181 /* Insert new 802.1Q header. */
182 struct vlan_eth_header tmp;
183 memcpy(tmp.veth_dst, eh->eth_dst, ETH_ADDR_LEN);
184 memcpy(tmp.veth_src, eh->eth_src, ETH_ADDR_LEN);
185 tmp.veth_type = htons(ETH_TYPE_VLAN);
186 tmp.veth_tci = tci & htons(~VLAN_CFI);
187 tmp.veth_next_type = eh->eth_type;
189 veh = ofpbuf_push_uninit(packet, VLAN_HEADER_LEN);
190 memcpy(veh, &tmp, sizeof tmp);
192 packet->l2 = packet->data;
195 /* Removes outermost VLAN header (if any is present) from 'packet'.
197 * 'packet->l2' must initially point to 'packet''s Ethernet header. */
199 eth_pop_vlan(struct ofpbuf *packet)
201 struct vlan_eth_header *veh = packet->l2;
202 if (packet->size >= sizeof *veh
203 && veh->veth_type == htons(ETH_TYPE_VLAN)) {
204 struct eth_header tmp;
206 memcpy(tmp.eth_dst, veh->veth_dst, ETH_ADDR_LEN);
207 memcpy(tmp.eth_src, veh->veth_src, ETH_ADDR_LEN);
208 tmp.eth_type = veh->veth_next_type;
210 ofpbuf_pull(packet, VLAN_HEADER_LEN);
211 packet->l2 = (char*)packet->l2 + VLAN_HEADER_LEN;
212 memcpy(packet->data, &tmp, sizeof tmp);
216 /* Converts hex digits in 'hex' to an Ethernet packet in '*packetp'. The
217 * caller must free '*packetp'. On success, returns NULL. On failure, returns
218 * an error message and stores NULL in '*packetp'. */
220 eth_from_hex(const char *hex, struct ofpbuf **packetp)
222 struct ofpbuf *packet;
224 packet = *packetp = ofpbuf_new(strlen(hex) / 2);
226 if (ofpbuf_put_hex(packet, hex, NULL)[0] != '\0') {
227 ofpbuf_delete(packet);
229 return "Trailing garbage in packet data";
232 if (packet->size < ETH_HEADER_LEN) {
233 ofpbuf_delete(packet);
235 return "Packet data too short for Ethernet";
242 eth_format_masked(const uint8_t eth[ETH_ADDR_LEN],
243 const uint8_t mask[ETH_ADDR_LEN], struct ds *s)
245 ds_put_format(s, ETH_ADDR_FMT, ETH_ADDR_ARGS(eth));
246 if (mask && !eth_mask_is_exact(mask)) {
247 ds_put_format(s, "/"ETH_ADDR_FMT, ETH_ADDR_ARGS(mask));
252 eth_addr_bitand(const uint8_t src[ETH_ADDR_LEN],
253 const uint8_t mask[ETH_ADDR_LEN],
254 uint8_t dst[ETH_ADDR_LEN])
258 for (i = 0; i < ETH_ADDR_LEN; i++) {
259 dst[i] = src[i] & mask[i];
263 /* Given the IP netmask 'netmask', returns the number of bits of the IP address
264 * that it specifies, that is, the number of 1-bits in 'netmask'.
266 * If 'netmask' is not a CIDR netmask (see ip_is_cidr()), the return value will
267 * still be in the valid range but isn't otherwise meaningful. */
269 ip_count_cidr_bits(ovs_be32 netmask)
271 return 32 - ctz(ntohl(netmask));
275 ip_format_masked(ovs_be32 ip, ovs_be32 mask, struct ds *s)
277 ds_put_format(s, IP_FMT, IP_ARGS(&ip));
278 if (mask != htonl(UINT32_MAX)) {
279 if (ip_is_cidr(mask)) {
280 ds_put_format(s, "/%d", ip_count_cidr_bits(mask));
282 ds_put_format(s, "/"IP_FMT, IP_ARGS(&mask));
288 /* Stores the string representation of the IPv6 address 'addr' into the
289 * character array 'addr_str', which must be at least INET6_ADDRSTRLEN
292 format_ipv6_addr(char *addr_str, const struct in6_addr *addr)
294 inet_ntop(AF_INET6, addr, addr_str, INET6_ADDRSTRLEN);
298 print_ipv6_addr(struct ds *string, const struct in6_addr *addr)
302 ds_reserve(string, string->length + INET6_ADDRSTRLEN);
304 dst = string->string + string->length;
305 format_ipv6_addr(dst, addr);
306 string->length += strlen(dst);
310 print_ipv6_masked(struct ds *s, const struct in6_addr *addr,
311 const struct in6_addr *mask)
313 print_ipv6_addr(s, addr);
314 if (mask && !ipv6_mask_is_exact(mask)) {
315 if (ipv6_is_cidr(mask)) {
316 int cidr_bits = ipv6_count_cidr_bits(mask);
317 ds_put_format(s, "/%d", cidr_bits);
320 print_ipv6_addr(s, mask);
325 struct in6_addr ipv6_addr_bitand(const struct in6_addr *a,
326 const struct in6_addr *b)
332 for (i=0; i<4; i++) {
333 dst.s6_addr32[i] = a->s6_addr32[i] & b->s6_addr32[i];
336 for (i=0; i<16; i++) {
337 dst.s6_addr[i] = a->s6_addr[i] & b->s6_addr[i];
344 /* Returns an in6_addr consisting of 'mask' high-order 1-bits and 128-N
345 * low-order 0-bits. */
347 ipv6_create_mask(int mask)
349 struct in6_addr netmask;
350 uint8_t *netmaskp = &netmask.s6_addr[0];
352 memset(&netmask, 0, sizeof netmask);
360 *netmaskp = 0xff << (8 - mask);
366 /* Given the IPv6 netmask 'netmask', returns the number of bits of the IPv6
367 * address that it specifies, that is, the number of 1-bits in 'netmask'.
368 * 'netmask' must be a CIDR netmask (see ipv6_is_cidr()).
370 * If 'netmask' is not a CIDR netmask (see ipv6_is_cidr()), the return value
371 * will still be in the valid range but isn't otherwise meaningful. */
373 ipv6_count_cidr_bits(const struct in6_addr *netmask)
377 const uint8_t *netmaskp = &netmask->s6_addr[0];
379 for (i=0; i<16; i++) {
380 if (netmaskp[i] == 0xff) {
385 for(nm = netmaskp[i]; nm; nm <<= 1) {
396 /* Returns true if 'netmask' is a CIDR netmask, that is, if it consists of N
397 * high-order 1-bits and 128-N low-order 0-bits. */
399 ipv6_is_cidr(const struct in6_addr *netmask)
401 const uint8_t *netmaskp = &netmask->s6_addr[0];
404 for (i=0; i<16; i++) {
405 if (netmaskp[i] != 0xff) {
406 uint8_t x = ~netmaskp[i];
421 /* Populates 'b' with an Ethernet II packet headed with the given 'eth_dst',
422 * 'eth_src' and 'eth_type' parameters. A payload of 'size' bytes is allocated
423 * in 'b' and returned. This payload may be populated with appropriate
424 * information by the caller. Sets 'b''s 'l2' and 'l3' pointers to the
425 * Ethernet header and payload respectively.
427 * The returned packet has enough headroom to insert an 802.1Q VLAN header if
430 eth_compose(struct ofpbuf *b, const uint8_t eth_dst[ETH_ADDR_LEN],
431 const uint8_t eth_src[ETH_ADDR_LEN], uint16_t eth_type,
435 struct eth_header *eth;
439 ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + VLAN_HEADER_LEN + size);
440 ofpbuf_reserve(b, VLAN_HEADER_LEN);
441 eth = ofpbuf_put_uninit(b, ETH_HEADER_LEN);
442 data = ofpbuf_put_uninit(b, size);
444 memcpy(eth->eth_dst, eth_dst, ETH_ADDR_LEN);
445 memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
446 eth->eth_type = htons(eth_type);
455 packet_set_ipv4_addr(struct ofpbuf *packet,
456 ovs_16aligned_be32 *addr, ovs_be32 new_addr)
458 struct ip_header *nh = packet->l3;
459 ovs_be32 old_addr = get_16aligned_be32(addr);
461 if (nh->ip_proto == IPPROTO_TCP && packet->l7) {
462 struct tcp_header *th = packet->l4;
464 th->tcp_csum = recalc_csum32(th->tcp_csum, old_addr, new_addr);
465 } else if (nh->ip_proto == IPPROTO_UDP && packet->l7) {
466 struct udp_header *uh = packet->l4;
469 uh->udp_csum = recalc_csum32(uh->udp_csum, old_addr, new_addr);
471 uh->udp_csum = htons(0xffff);
475 nh->ip_csum = recalc_csum32(nh->ip_csum, old_addr, new_addr);
476 put_16aligned_be32(addr, new_addr);
479 /* Returns true, if packet contains at least one routing header where
480 * segements_left > 0.
482 * This function assumes that L3 and L4 markers are set in the packet. */
484 packet_rh_present(struct ofpbuf *packet)
486 const struct ip6_hdr *nh;
490 uint8_t *data = packet->l3;
492 remaining = (uint8_t *)packet->l4 - (uint8_t *)packet->l3;
494 if (remaining < sizeof *nh) {
497 nh = (struct ip6_hdr *)data;
499 remaining -= sizeof *nh;
500 nexthdr = nh->ip6_nxt;
503 if ((nexthdr != IPPROTO_HOPOPTS)
504 && (nexthdr != IPPROTO_ROUTING)
505 && (nexthdr != IPPROTO_DSTOPTS)
506 && (nexthdr != IPPROTO_AH)
507 && (nexthdr != IPPROTO_FRAGMENT)) {
508 /* It's either a terminal header (e.g., TCP, UDP) or one we
509 * don't understand. In either case, we're done with the
510 * packet, so use it to fill in 'nw_proto'. */
514 /* We only verify that at least 8 bytes of the next header are
515 * available, but many of these headers are longer. Ensure that
516 * accesses within the extension header are within those first 8
517 * bytes. All extension headers are required to be at least 8
523 if (nexthdr == IPPROTO_AH) {
524 /* A standard AH definition isn't available, but the fields
525 * we care about are in the same location as the generic
526 * option header--only the header length is calculated
528 const struct ip6_ext *ext_hdr = (struct ip6_ext *)data;
530 nexthdr = ext_hdr->ip6e_nxt;
531 len = (ext_hdr->ip6e_len + 2) * 4;
532 } else if (nexthdr == IPPROTO_FRAGMENT) {
533 const struct ip6_frag *frag_hdr = (struct ip6_frag *)data;
535 nexthdr = frag_hdr->ip6f_nxt;
536 len = sizeof *frag_hdr;
537 } else if (nexthdr == IPPROTO_ROUTING) {
538 const struct ip6_rthdr *rh = (struct ip6_rthdr *)data;
540 if (rh->ip6r_segleft > 0) {
544 nexthdr = rh->ip6r_nxt;
545 len = (rh->ip6r_len + 1) * 8;
547 const struct ip6_ext *ext_hdr = (struct ip6_ext *)data;
549 nexthdr = ext_hdr->ip6e_nxt;
550 len = (ext_hdr->ip6e_len + 1) * 8;
553 if (remaining < len) {
564 packet_update_csum128(struct ofpbuf *packet, uint8_t proto,
565 ovs_be32 addr[4], const ovs_be32 new_addr[4])
567 if (proto == IPPROTO_TCP && packet->l7) {
568 struct tcp_header *th = packet->l4;
570 th->tcp_csum = recalc_csum128(th->tcp_csum, addr, new_addr);
571 } else if (proto == IPPROTO_UDP && packet->l7) {
572 struct udp_header *uh = packet->l4;
575 uh->udp_csum = recalc_csum128(uh->udp_csum, addr, new_addr);
577 uh->udp_csum = htons(0xffff);
584 packet_set_ipv6_addr(struct ofpbuf *packet, uint8_t proto,
585 struct in6_addr *addr, const ovs_be32 new_addr[4],
586 bool recalculate_csum)
588 if (recalculate_csum) {
589 packet_update_csum128(packet, proto, (ovs_be32 *)addr, new_addr);
591 memcpy(addr, new_addr, sizeof(*addr));
595 packet_set_ipv6_flow_label(ovs_be32 *flow_label, ovs_be32 flow_key)
597 *flow_label = (*flow_label & htonl(~IPV6_LABEL_MASK)) | flow_key;
601 packet_set_ipv6_tc(ovs_be32 *flow_label, uint8_t tc)
603 *flow_label = (*flow_label & htonl(0xF00FFFFF)) | htonl(tc << 20);
606 /* Modifies the IPv4 header fields of 'packet' to be consistent with 'src',
607 * 'dst', 'tos', and 'ttl'. Updates 'packet''s L4 checksums as appropriate.
608 * 'packet' must contain a valid IPv4 packet with correctly populated l[347]
611 packet_set_ipv4(struct ofpbuf *packet, ovs_be32 src, ovs_be32 dst,
612 uint8_t tos, uint8_t ttl)
614 struct ip_header *nh = packet->l3;
616 if (get_16aligned_be32(&nh->ip_src) != src) {
617 packet_set_ipv4_addr(packet, &nh->ip_src, src);
620 if (get_16aligned_be32(&nh->ip_dst) != dst) {
621 packet_set_ipv4_addr(packet, &nh->ip_dst, dst);
624 if (nh->ip_tos != tos) {
625 uint8_t *field = &nh->ip_tos;
627 nh->ip_csum = recalc_csum16(nh->ip_csum, htons((uint16_t) *field),
628 htons((uint16_t) tos));
632 if (nh->ip_ttl != ttl) {
633 uint8_t *field = &nh->ip_ttl;
635 nh->ip_csum = recalc_csum16(nh->ip_csum, htons(*field << 8),
641 /* Modifies the IPv6 header fields of 'packet' to be consistent with 'src',
642 * 'dst', 'traffic class', and 'next hop'. Updates 'packet''s L4 checksums as
643 * appropriate. 'packet' must contain a valid IPv6 packet with correctly
644 * populated l[347] markers. */
646 packet_set_ipv6(struct ofpbuf *packet, uint8_t proto, const ovs_be32 src[4],
647 const ovs_be32 dst[4], uint8_t key_tc, ovs_be32 key_fl,
650 struct ip6_hdr *nh = packet->l3;
652 if (memcmp(&nh->ip6_src, src, sizeof(ovs_be32[4]))) {
653 packet_set_ipv6_addr(packet, proto, &nh->ip6_src, src, true);
656 if (memcmp(&nh->ip6_dst, dst, sizeof(ovs_be32[4]))) {
657 packet_set_ipv6_addr(packet, proto, &nh->ip6_dst, dst,
658 !packet_rh_present(packet));
661 packet_set_ipv6_tc(&nh->ip6_flow, key_tc);
663 packet_set_ipv6_flow_label(&nh->ip6_flow, key_fl);
665 nh->ip6_hlim = key_hl;
669 packet_set_port(ovs_be16 *port, ovs_be16 new_port, ovs_be16 *csum)
671 if (*port != new_port) {
672 *csum = recalc_csum16(*csum, *port, new_port);
677 /* Sets the TCP source and destination port ('src' and 'dst' respectively) of
678 * the TCP header contained in 'packet'. 'packet' must be a valid TCP packet
679 * with its l4 marker properly populated. */
681 packet_set_tcp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst)
683 struct tcp_header *th = packet->l4;
685 packet_set_port(&th->tcp_src, src, &th->tcp_csum);
686 packet_set_port(&th->tcp_dst, dst, &th->tcp_csum);
689 /* Sets the UDP source and destination port ('src' and 'dst' respectively) of
690 * the UDP header contained in 'packet'. 'packet' must be a valid UDP packet
691 * with its l4 marker properly populated. */
693 packet_set_udp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst)
695 struct udp_header *uh = packet->l4;
698 packet_set_port(&uh->udp_src, src, &uh->udp_csum);
699 packet_set_port(&uh->udp_dst, dst, &uh->udp_csum);
702 uh->udp_csum = htons(0xffff);
710 /* If 'packet' is a TCP packet, returns the TCP flags. Otherwise, returns 0.
712 * 'flow' must be the flow corresponding to 'packet' and 'packet''s header
713 * pointers must be properly initialized (e.g. with flow_extract()). */
715 packet_get_tcp_flags(const struct ofpbuf *packet, const struct flow *flow)
717 if ((flow->dl_type == htons(ETH_TYPE_IP) ||
718 flow->dl_type == htons(ETH_TYPE_IPV6)) &&
719 flow->nw_proto == IPPROTO_TCP && packet->l7) {
720 const struct tcp_header *tcp = packet->l4;
721 return TCP_FLAGS(tcp->tcp_ctl);
727 /* Appends a string representation of the TCP flags value 'tcp_flags'
728 * (e.g. obtained via packet_get_tcp_flags() or TCP_FLAGS) to 's', in the
729 * format used by tcpdump. */
731 packet_format_tcp_flags(struct ds *s, uint8_t tcp_flags)
734 ds_put_cstr(s, "none");
738 if (tcp_flags & TCP_SYN) {
741 if (tcp_flags & TCP_FIN) {
744 if (tcp_flags & TCP_PSH) {
747 if (tcp_flags & TCP_RST) {
750 if (tcp_flags & TCP_URG) {
753 if (tcp_flags & TCP_ACK) {
756 if (tcp_flags & 0x40) {
757 ds_put_cstr(s, "[40]");
759 if (tcp_flags & 0x80) {
760 ds_put_cstr(s, "[80]");