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]");