2 * Copyright (c) 2008, 2009, 2010, 2011, 2012 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.
21 #include <sys/types.h>
22 #include <netinet/in.h>
26 #include "openvswitch/types.h"
34 bool dpid_from_string(const char *s, uint64_t *dpidp);
36 #define ETH_ADDR_LEN 6
38 static const uint8_t eth_addr_broadcast[ETH_ADDR_LEN] OVS_UNUSED
39 = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
41 static const uint8_t eth_addr_stp[ETH_ADDR_LEN] OVS_UNUSED
42 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x00 };
44 static const uint8_t eth_addr_lacp[ETH_ADDR_LEN] OVS_UNUSED
45 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x02 };
47 static inline bool eth_addr_is_broadcast(const uint8_t ea[6])
49 return (ea[0] & ea[1] & ea[2] & ea[3] & ea[4] & ea[5]) == 0xff;
52 static inline bool eth_addr_is_multicast(const uint8_t ea[6])
56 static inline bool eth_addr_is_local(const uint8_t ea[6])
58 /* Local if it is either a locally administered address or a Nicira random
61 || (ea[0] == 0x00 && ea[1] == 0x23 && ea[2] == 0x20 && ea[3] & 0x80);
63 static inline bool eth_addr_is_zero(const uint8_t ea[6])
65 return !(ea[0] | ea[1] | ea[2] | ea[3] | ea[4] | ea[5]);
68 static inline int eth_mask_is_exact(const uint8_t ea[ETH_ADDR_LEN])
70 return (ea[0] & ea[1] & ea[2] & ea[3] & ea[4] & ea[5]) == 0xff;
73 static inline int eth_addr_compare_3way(const uint8_t a[ETH_ADDR_LEN],
74 const uint8_t b[ETH_ADDR_LEN])
76 return memcmp(a, b, ETH_ADDR_LEN);
78 static inline bool eth_addr_equals(const uint8_t a[ETH_ADDR_LEN],
79 const uint8_t b[ETH_ADDR_LEN])
81 return !eth_addr_compare_3way(a, b);
83 static inline bool eth_addr_equal_except(const uint8_t a[ETH_ADDR_LEN],
84 const uint8_t b[ETH_ADDR_LEN],
85 const uint8_t mask[ETH_ADDR_LEN])
87 return !(((a[0] ^ b[0]) & mask[0])
88 || ((a[1] ^ b[1]) & mask[1])
89 || ((a[2] ^ b[2]) & mask[2])
90 || ((a[3] ^ b[3]) & mask[3])
91 || ((a[4] ^ b[4]) & mask[4])
92 || ((a[5] ^ b[5]) & mask[5]));
94 static inline uint64_t eth_addr_to_uint64(const uint8_t ea[ETH_ADDR_LEN])
96 return (((uint64_t) ea[0] << 40)
97 | ((uint64_t) ea[1] << 32)
98 | ((uint64_t) ea[2] << 24)
99 | ((uint64_t) ea[3] << 16)
100 | ((uint64_t) ea[4] << 8)
103 static inline void eth_addr_from_uint64(uint64_t x, uint8_t ea[ETH_ADDR_LEN])
112 static inline void eth_addr_mark_random(uint8_t ea[ETH_ADDR_LEN])
114 ea[0] &= ~1; /* Unicast. */
115 ea[0] |= 2; /* Private. */
117 static inline void eth_addr_random(uint8_t ea[ETH_ADDR_LEN])
119 random_bytes(ea, ETH_ADDR_LEN);
120 eth_addr_mark_random(ea);
122 static inline void eth_addr_nicira_random(uint8_t ea[ETH_ADDR_LEN])
126 /* Set the OUI to the Nicira one. */
131 /* Set the top bit to indicate random Nicira address. */
134 /* Returns true if 'ea' is a reserved multicast address, that a bridge must
135 * never forward, false otherwise. */
136 static inline bool eth_addr_is_reserved(const uint8_t ea[ETH_ADDR_LEN])
138 return (ea[0] == 0x01
143 && (ea[5] & 0xf0) == 0x00);
146 bool eth_addr_from_string(const char *, uint8_t ea[ETH_ADDR_LEN]);
148 void compose_benign_packet(struct ofpbuf *, const char *tag,
150 const uint8_t eth_src[ETH_ADDR_LEN]);
152 void eth_push_vlan(struct ofpbuf *, ovs_be16 tci);
153 void eth_pop_vlan(struct ofpbuf *);
155 const char *eth_from_hex(const char *hex, struct ofpbuf **packetp);
156 void eth_format_masked(const uint8_t eth[ETH_ADDR_LEN],
157 const uint8_t mask[ETH_ADDR_LEN], struct ds *s);
158 void eth_addr_bitand(const uint8_t src[ETH_ADDR_LEN],
159 const uint8_t mask[ETH_ADDR_LEN],
160 uint8_t dst[ETH_ADDR_LEN]);
164 * uint8_t mac[ETH_ADDR_LEN];
166 * printf("The Ethernet address is "ETH_ADDR_FMT"\n", ETH_ADDR_ARGS(mac));
169 #define ETH_ADDR_FMT \
170 "%02"PRIx8":%02"PRIx8":%02"PRIx8":%02"PRIx8":%02"PRIx8":%02"PRIx8
171 #define ETH_ADDR_ARGS(ea) \
172 (ea)[0], (ea)[1], (ea)[2], (ea)[3], (ea)[4], (ea)[5]
176 * char *string = "1 00:11:22:33:44:55 2";
177 * uint8_t mac[ETH_ADDR_LEN];
180 * if (sscanf(string, "%d"ETH_ADDR_SCAN_FMT"%d",
181 * &a, ETH_ADDR_SCAN_ARGS(mac), &b) == 1 + ETH_ADDR_SCAN_COUNT + 1) {
185 #define ETH_ADDR_SCAN_FMT "%"SCNx8":%"SCNx8":%"SCNx8":%"SCNx8":%"SCNx8":%"SCNx8
186 #define ETH_ADDR_SCAN_ARGS(ea) \
187 &(ea)[0], &(ea)[1], &(ea)[2], &(ea)[3], &(ea)[4], &(ea)[5]
188 #define ETH_ADDR_SCAN_COUNT 6
190 #define ETH_TYPE_IP 0x0800
191 #define ETH_TYPE_ARP 0x0806
192 #define ETH_TYPE_VLAN 0x8100
193 #define ETH_TYPE_IPV6 0x86dd
194 #define ETH_TYPE_LACP 0x8809
196 /* Minimum value for an Ethernet type. Values below this are IEEE 802.2 frame
198 #define ETH_TYPE_MIN 0x600
200 #define ETH_HEADER_LEN 14
201 #define ETH_PAYLOAD_MIN 46
202 #define ETH_PAYLOAD_MAX 1500
203 #define ETH_TOTAL_MIN (ETH_HEADER_LEN + ETH_PAYLOAD_MIN)
204 #define ETH_TOTAL_MAX (ETH_HEADER_LEN + ETH_PAYLOAD_MAX)
205 #define ETH_VLAN_TOTAL_MAX (ETH_HEADER_LEN + VLAN_HEADER_LEN + ETH_PAYLOAD_MAX)
207 uint8_t eth_dst[ETH_ADDR_LEN];
208 uint8_t eth_src[ETH_ADDR_LEN];
210 } __attribute__((packed));
211 BUILD_ASSERT_DECL(ETH_HEADER_LEN == sizeof(struct eth_header));
213 #define LLC_DSAP_SNAP 0xaa
214 #define LLC_SSAP_SNAP 0xaa
215 #define LLC_CNTL_SNAP 3
217 #define LLC_HEADER_LEN 3
222 } __attribute__((packed));
223 BUILD_ASSERT_DECL(LLC_HEADER_LEN == sizeof(struct llc_header));
225 #define SNAP_ORG_ETHERNET "\0\0" /* The compiler adds a null byte, so
226 sizeof(SNAP_ORG_ETHERNET) == 3. */
227 #define SNAP_HEADER_LEN 5
231 } __attribute__((packed));
232 BUILD_ASSERT_DECL(SNAP_HEADER_LEN == sizeof(struct snap_header));
234 #define LLC_SNAP_HEADER_LEN (LLC_HEADER_LEN + SNAP_HEADER_LEN)
235 struct llc_snap_header {
236 struct llc_header llc;
237 struct snap_header snap;
238 } __attribute__((packed));
239 BUILD_ASSERT_DECL(LLC_SNAP_HEADER_LEN == sizeof(struct llc_snap_header));
241 #define VLAN_VID_MASK 0x0fff
242 #define VLAN_VID_SHIFT 0
244 #define VLAN_PCP_MASK 0xe000
245 #define VLAN_PCP_SHIFT 13
247 #define VLAN_CFI 0x1000
249 /* Given the vlan_tci field from an 802.1Q header, in network byte order,
250 * returns the VLAN ID in host byte order. */
251 static inline uint16_t
252 vlan_tci_to_vid(ovs_be16 vlan_tci)
254 return (ntohs(vlan_tci) & VLAN_VID_MASK) >> VLAN_VID_SHIFT;
257 /* Given the vlan_tci field from an 802.1Q header, in network byte order,
258 * returns the priority code point (PCP) in host byte order. */
260 vlan_tci_to_pcp(ovs_be16 vlan_tci)
262 return (ntohs(vlan_tci) & VLAN_PCP_MASK) >> VLAN_PCP_SHIFT;
265 #define VLAN_HEADER_LEN 4
267 ovs_be16 vlan_tci; /* Lowest 12 bits are VLAN ID. */
268 ovs_be16 vlan_next_type;
270 BUILD_ASSERT_DECL(VLAN_HEADER_LEN == sizeof(struct vlan_header));
272 #define VLAN_ETH_HEADER_LEN (ETH_HEADER_LEN + VLAN_HEADER_LEN)
273 struct vlan_eth_header {
274 uint8_t veth_dst[ETH_ADDR_LEN];
275 uint8_t veth_src[ETH_ADDR_LEN];
276 ovs_be16 veth_type; /* Always htons(ETH_TYPE_VLAN). */
277 ovs_be16 veth_tci; /* Lowest 12 bits are VLAN ID. */
278 ovs_be16 veth_next_type;
279 } __attribute__((packed));
280 BUILD_ASSERT_DECL(VLAN_ETH_HEADER_LEN == sizeof(struct vlan_eth_header));
282 /* The "(void) (ip)[0]" below has no effect on the value, since it's the first
283 * argument of a comma expression, but it makes sure that 'ip' is a pointer.
284 * This is useful since a common mistake is to pass an integer instead of a
285 * pointer to IP_ARGS. */
286 #define IP_FMT "%"PRIu8".%"PRIu8".%"PRIu8".%"PRIu8
287 #define IP_ARGS(ip) \
288 ((void) (ip)[0], ((uint8_t *) ip)[0]), \
289 ((uint8_t *) ip)[1], \
290 ((uint8_t *) ip)[2], \
295 * char *string = "1 33.44.55.66 2";
299 * if (sscanf(string, "%d"IP_SCAN_FMT"%d",
300 * &a, IP_SCAN_ARGS(&ip), &b) == 1 + IP_SCAN_COUNT + 1) {
304 #define IP_SCAN_FMT "%"SCNu8".%"SCNu8".%"SCNu8".%"SCNu8
305 #define IP_SCAN_ARGS(ip) \
306 ((void) (ovs_be32) *(ip), &((uint8_t *) ip)[0]), \
307 &((uint8_t *) ip)[1], \
308 &((uint8_t *) ip)[2], \
310 #define IP_SCAN_COUNT 4
312 /* Returns true if 'netmask' is a CIDR netmask, that is, if it consists of N
313 * high-order 1-bits and 32-N low-order 0-bits. */
315 ip_is_cidr(ovs_be32 netmask)
317 uint32_t x = ~ntohl(netmask);
318 return !(x & (x + 1));
321 ip_is_multicast(ovs_be32 ip)
323 return (ip & htonl(0xf0000000)) == htonl(0xe0000000);
325 int ip_count_cidr_bits(ovs_be32 netmask);
326 void ip_format_masked(ovs_be32 ip, ovs_be32 mask, struct ds *);
328 #define IP_VER(ip_ihl_ver) ((ip_ihl_ver) >> 4)
329 #define IP_IHL(ip_ihl_ver) ((ip_ihl_ver) & 15)
330 #define IP_IHL_VER(ihl, ver) (((ver) << 4) | (ihl))
333 #define IP_ECN_MASK 0x03
334 #define IP_DSCP_MASK 0xfc
338 #define IP_DONT_FRAGMENT 0x4000 /* Don't fragment. */
339 #define IP_MORE_FRAGMENTS 0x2000 /* More fragments. */
340 #define IP_FRAG_OFF_MASK 0x1fff /* Fragment offset. */
341 #define IP_IS_FRAGMENT(ip_frag_off) \
342 ((ip_frag_off) & htons(IP_MORE_FRAGMENTS | IP_FRAG_OFF_MASK))
344 #define IP_HEADER_LEN 20
350 ovs_be16 ip_frag_off;
357 BUILD_ASSERT_DECL(IP_HEADER_LEN == sizeof(struct ip_header));
359 #define ICMP_HEADER_LEN 8
375 uint8_t icmp_data[0];
377 BUILD_ASSERT_DECL(ICMP_HEADER_LEN == sizeof(struct icmp_header));
379 #define UDP_HEADER_LEN 8
386 BUILD_ASSERT_DECL(UDP_HEADER_LEN == sizeof(struct udp_header));
395 #define TCP_CTL(flags, offset) (htons((flags) | ((offset) << 12)))
396 #define TCP_FLAGS(tcp_ctl) (ntohs(tcp_ctl) & 0x003f)
397 #define TCP_OFFSET(tcp_ctl) (ntohs(tcp_ctl) >> 12)
399 #define TCP_HEADER_LEN 20
410 BUILD_ASSERT_DECL(TCP_HEADER_LEN == sizeof(struct tcp_header));
412 #define ARP_HRD_ETHERNET 1
413 #define ARP_PRO_IP 0x0800
414 #define ARP_OP_REQUEST 1
415 #define ARP_OP_REPLY 2
417 #define ARP_ETH_HEADER_LEN 28
418 struct arp_eth_header {
419 /* Generic members. */
420 ovs_be16 ar_hrd; /* Hardware type. */
421 ovs_be16 ar_pro; /* Protocol type. */
422 uint8_t ar_hln; /* Hardware address length. */
423 uint8_t ar_pln; /* Protocol address length. */
424 ovs_be16 ar_op; /* Opcode. */
426 /* Ethernet+IPv4 specific members. */
427 uint8_t ar_sha[ETH_ADDR_LEN]; /* Sender hardware address. */
428 ovs_be32 ar_spa; /* Sender protocol address. */
429 uint8_t ar_tha[ETH_ADDR_LEN]; /* Target hardware address. */
430 ovs_be32 ar_tpa; /* Target protocol address. */
431 } __attribute__((packed));
432 BUILD_ASSERT_DECL(ARP_ETH_HEADER_LEN == sizeof(struct arp_eth_header));
434 /* The IPv6 flow label is in the lower 20 bits of the first 32-bit word. */
435 #define IPV6_LABEL_MASK 0x000fffff
439 * char *string = "1 ::1 2";
440 * char ipv6_s[IPV6_SCAN_LEN + 1];
441 * struct in6_addr ipv6;
443 * if (sscanf(string, "%d"IPV6_SCAN_FMT"%d", &a, ipv6_s, &b) == 3
444 * && inet_pton(AF_INET6, ipv6_s, &ipv6) == 1) {
448 #define IPV6_SCAN_FMT "%46[0123456789abcdefABCDEF:.]"
449 #define IPV6_SCAN_LEN 46
451 extern const struct in6_addr in6addr_exact;
452 #define IN6ADDR_EXACT_INIT { { { 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, \
453 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff } } }
455 static inline bool ipv6_addr_equals(const struct in6_addr *a,
456 const struct in6_addr *b)
458 #ifdef IN6_ARE_ADDR_EQUAL
459 return IN6_ARE_ADDR_EQUAL(a, b);
461 return !memcmp(a, b, sizeof(*a));
465 static inline bool ipv6_mask_is_any(const struct in6_addr *mask) {
466 return ipv6_addr_equals(mask, &in6addr_any);
469 static inline bool ipv6_mask_is_exact(const struct in6_addr *mask) {
470 return ipv6_addr_equals(mask, &in6addr_exact);
473 void format_ipv6_addr(char *addr_str, const struct in6_addr *addr);
474 void print_ipv6_addr(struct ds *string, const struct in6_addr *addr);
475 void print_ipv6_masked(struct ds *string, const struct in6_addr *addr,
476 const struct in6_addr *mask);
477 struct in6_addr ipv6_addr_bitand(const struct in6_addr *src,
478 const struct in6_addr *mask);
479 struct in6_addr ipv6_create_mask(int mask);
480 int ipv6_count_cidr_bits(const struct in6_addr *netmask);
481 bool ipv6_is_cidr(const struct in6_addr *netmask);
483 void *eth_compose(struct ofpbuf *, const uint8_t eth_dst[ETH_ADDR_LEN],
484 const uint8_t eth_src[ETH_ADDR_LEN], uint16_t eth_type,
486 void *snap_compose(struct ofpbuf *, const uint8_t eth_dst[ETH_ADDR_LEN],
487 const uint8_t eth_src[ETH_ADDR_LEN],
488 unsigned int oui, uint16_t snap_type, size_t size);
489 void packet_set_ipv4(struct ofpbuf *, ovs_be32 src, ovs_be32 dst, uint8_t tos,
491 void packet_set_tcp_port(struct ofpbuf *, ovs_be16 src, ovs_be16 dst);
492 void packet_set_udp_port(struct ofpbuf *, ovs_be16 src, ovs_be16 dst);
494 uint8_t packet_get_tcp_flags(const struct ofpbuf *, const struct flow *);
495 void packet_format_tcp_flags(struct ds *, uint8_t);
497 #endif /* packets.h */