2 * QEMU network structures definitions and helper functions
4 * Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
6 * Developed by Daynix Computing LTD (http://www.daynix.com)
8 * Portions developed by Free Software Foundation, Inc
9 * Copyright (C) 1991-1997, 2001, 2003, 2006 Free Software Foundation, Inc.
10 * See netinet/ip6.h and netinet/in.h (GNU C Library)
12 * Portions developed by Igor Kovalenko
13 * Copyright (c) 2006 Igor Kovalenko
14 * See hw/rtl8139.c (QEMU)
17 * Dmitry Fleytman <dmitry@daynix.com>
18 * Tamir Shomer <tamirs@daynix.com>
19 * Yan Vugenfirer <yan@daynix.com>
21 * This work is licensed under the terms of the GNU GPL, version 2 or later.
22 * See the COPYING file in the top-level directory.
29 #include <sys/types.h>
31 #include "qemu/bswap.h"
37 uint8_t h_dest
[ETH_ALEN
]; /* destination eth addr */
38 uint8_t h_source
[ETH_ALEN
]; /* source ether addr */
39 uint16_t h_proto
; /* packet type ID field */
43 uint16_t h_tci
; /* priority and VLAN ID */
44 uint16_t h_proto
; /* encapsulated protocol */
48 uint8_t ip_ver_len
; /* version and header length */
49 uint8_t ip_tos
; /* type of service */
50 uint16_t ip_len
; /* total length */
51 uint16_t ip_id
; /* identification */
52 uint16_t ip_off
; /* fragment offset field */
53 uint8_t ip_ttl
; /* time to live */
54 uint8_t ip_p
; /* protocol */
55 uint16_t ip_sum
; /* checksum */
56 uint32_t ip_src
, ip_dst
; /* source and destination address */
59 typedef struct tcp_header
{
60 uint16_t th_sport
; /* source port */
61 uint16_t th_dport
; /* destination port */
62 uint32_t th_seq
; /* sequence number */
63 uint32_t th_ack
; /* acknowledgment number */
64 uint16_t th_offset_flags
; /* data offset, reserved 6 bits, */
65 /* TCP protocol flags */
66 uint16_t th_win
; /* window */
67 uint16_t th_sum
; /* checksum */
68 uint16_t th_urp
; /* urgent pointer */
71 typedef struct udp_header
{
72 uint16_t uh_sport
; /* source port */
73 uint16_t uh_dport
; /* destination port */
74 uint16_t uh_ulen
; /* udp length */
75 uint16_t uh_sum
; /* udp checksum */
78 typedef struct ip_pseudo_header
{
89 uint8_t __u6_addr8
[16];
96 uint32_t ip6_un1_flow
; /* 4 bits version, 8 bits TC,
98 uint16_t ip6_un1_plen
; /* payload length */
99 uint8_t ip6_un1_nxt
; /* next header */
100 uint8_t ip6_un1_hlim
; /* hop limit */
102 uint8_t ip6_un2_vfc
; /* 4 bits version, top 4 bits tclass */
103 struct ip6_ecn_access
{
104 uint8_t ip6_un3_vfc
; /* 4 bits version, top 4 bits tclass */
105 uint8_t ip6_un3_ecn
; /* 2 bits ECN, top 6 bits payload length */
108 struct in6_address ip6_src
; /* source address */
109 struct in6_address ip6_dst
; /* destination address */
113 uint8_t ip6r_nxt
; /* next header */
114 uint8_t ip6r_len
; /* length in units of 8 octets */
118 uint16_t uh_sport
; /* source port */
119 uint16_t uh_dport
; /* destination port */
120 uint16_t uh_ulen
; /* udp length */
121 uint16_t uh_sum
; /* udp checksum */
125 u_short th_sport
; /* source port */
126 u_short th_dport
; /* destination port */
127 uint32_t th_seq
; /* sequence number */
128 uint32_t th_ack
; /* acknowledgment number */
129 #ifdef HOST_WORDS_BIGENDIAN
130 u_char th_off
: 4, /* data offset */
131 th_x2
:4; /* (unused) */
133 u_char th_x2
: 4, /* (unused) */
134 th_off
:4; /* data offset */
137 #define TH_ELN 0x1 /* explicit loss notification */
138 #define TH_ECN 0x2 /* explicit congestion notification */
139 #define TH_FS 0x4 /* fast start */
148 u_short th_win
; /* window */
149 u_short th_sum
; /* checksum */
150 u_short th_urp
; /* urgent pointer */
153 #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
154 #define ip6_ecn_acc ip6_ctlun.ip6_un3.ip6_un3_ecn
156 #define PKT_GET_ETH_HDR(p) \
157 ((struct eth_header *)(p))
158 #define PKT_GET_VLAN_HDR(p) \
159 ((struct vlan_header *) (((uint8_t *)(p)) + sizeof(struct eth_header)))
160 #define PKT_GET_DVLAN_HDR(p) \
161 (PKT_GET_VLAN_HDR(p) + 1)
162 #define PKT_GET_IP_HDR(p) \
163 ((struct ip_header *)(((uint8_t *)(p)) + eth_get_l2_hdr_length(p)))
164 #define IP_HDR_GET_LEN(p) \
165 ((((struct ip_header *)p)->ip_ver_len & 0x0F) << 2)
166 #define PKT_GET_IP_HDR_LEN(p) \
167 (IP_HDR_GET_LEN(PKT_GET_IP_HDR(p)))
168 #define PKT_GET_IP6_HDR(p) \
169 ((struct ip6_header *) (((uint8_t *)(p)) + eth_get_l2_hdr_length(p)))
170 #define IP_HEADER_VERSION(ip) \
171 ((ip->ip_ver_len >> 4)&0xf)
173 #define ETH_P_IP (0x0800)
174 #define ETH_P_IPV6 (0x86dd)
175 #define ETH_P_VLAN (0x8100)
176 #define ETH_P_DVLAN (0x88a8)
177 #define VLAN_VID_MASK 0x0fff
178 #define IP_HEADER_VERSION_4 (4)
179 #define IP_HEADER_VERSION_6 (6)
180 #define IP_PROTO_TCP (6)
181 #define IP_PROTO_UDP (17)
182 #define IPTOS_ECN_MASK 0x03
183 #define IPTOS_ECN(x) ((x) & IPTOS_ECN_MASK)
184 #define IPTOS_ECN_CE 0x03
185 #define IP6_ECN_MASK 0xC0
186 #define IP6_ECN(x) ((x) & IP6_ECN_MASK)
187 #define IP6_ECN_CE 0xC0
188 #define IP4_DONT_FRAGMENT_FLAG (1 << 14)
190 #define IS_SPECIAL_VLAN_ID(x) \
191 (((x) == 0) || ((x) == 0xFFF))
193 #define ETH_MAX_L2_HDR_LEN \
194 (sizeof(struct eth_header) + 2 * sizeof(struct vlan_header))
196 #define ETH_MAX_IP4_HDR_LEN (60)
197 #define ETH_MAX_IP_DGRAM_LEN (0xFFFF)
199 #define IP_FRAG_UNIT_SIZE (8)
200 #define IP_FRAG_ALIGN_SIZE(x) ((x) & ~0x7)
201 #define IP_RF 0x8000 /* reserved fragment flag */
202 #define IP_DF 0x4000 /* don't fragment flag */
203 #define IP_MF 0x2000 /* more fragments flag */
204 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
206 #define IP6_EXT_GRANULARITY (8) /* Size granularity for
207 IPv6 extension headers */
209 /* IP6 extension header types */
210 #define IP6_HOP_BY_HOP (0)
211 #define IP6_ROUTING (43)
212 #define IP6_FRAGMENT (44)
214 #define IP6_AUTHENTICATION (51)
215 #define IP6_NONE (59)
216 #define IP6_DESTINATON (60)
217 #define IP6_MOBILITY (135)
219 static inline int is_multicast_ether_addr(const uint8_t *addr
)
221 return 0x01 & addr
[0];
224 static inline int is_broadcast_ether_addr(const uint8_t *addr
)
226 return (addr
[0] & addr
[1] & addr
[2] & addr
[3] & addr
[4] & addr
[5]) == 0xff;
229 static inline int is_unicast_ether_addr(const uint8_t *addr
)
231 return !is_multicast_ether_addr(addr
);
235 ETH_PKT_UCAST
= 0xAABBCC00,
240 static inline eth_pkt_types_e
241 get_eth_packet_type(const struct eth_header
*ehdr
)
243 if (is_broadcast_ether_addr(ehdr
->h_dest
)) {
244 return ETH_PKT_BCAST
;
245 } else if (is_multicast_ether_addr(ehdr
->h_dest
)) {
246 return ETH_PKT_MCAST
;
247 } else { /* unicast */
248 return ETH_PKT_UCAST
;
252 static inline uint32_t
253 eth_get_l2_hdr_length(const void *p
)
255 uint16_t proto
= be16_to_cpu(PKT_GET_ETH_HDR(p
)->h_proto
);
256 struct vlan_header
*hvlan
= PKT_GET_VLAN_HDR(p
);
259 return sizeof(struct eth_header
) + sizeof(struct vlan_header
);
261 if (hvlan
->h_proto
== ETH_P_VLAN
) {
262 return sizeof(struct eth_header
) + 2 * sizeof(struct vlan_header
);
264 return sizeof(struct eth_header
) + sizeof(struct vlan_header
);
267 return sizeof(struct eth_header
);
271 static inline uint16_t
272 eth_get_pkt_tci(const void *p
)
274 uint16_t proto
= be16_to_cpu(PKT_GET_ETH_HDR(p
)->h_proto
);
275 struct vlan_header
*hvlan
= PKT_GET_VLAN_HDR(p
);
279 return be16_to_cpu(hvlan
->h_tci
);
286 eth_strip_vlan(const void *p
, uint8_t *new_ehdr_buf
,
287 uint16_t *payload_offset
, uint16_t *tci
)
289 uint16_t proto
= be16_to_cpu(PKT_GET_ETH_HDR(p
)->h_proto
);
290 struct vlan_header
*hvlan
= PKT_GET_VLAN_HDR(p
);
291 struct eth_header
*new_ehdr
= (struct eth_header
*) new_ehdr_buf
;
296 memcpy(new_ehdr
->h_source
, PKT_GET_ETH_HDR(p
)->h_source
, ETH_ALEN
);
297 memcpy(new_ehdr
->h_dest
, PKT_GET_ETH_HDR(p
)->h_dest
, ETH_ALEN
);
298 new_ehdr
->h_proto
= hvlan
->h_proto
;
299 *tci
= be16_to_cpu(hvlan
->h_tci
);
301 sizeof(struct eth_header
) + sizeof(struct vlan_header
);
302 if (be16_to_cpu(new_ehdr
->h_proto
) == ETH_P_VLAN
) {
303 memcpy(PKT_GET_VLAN_HDR(new_ehdr
),
304 PKT_GET_DVLAN_HDR(p
),
305 sizeof(struct vlan_header
));
306 *payload_offset
+= sizeof(struct vlan_header
);
314 static inline uint16_t
315 eth_get_l3_proto(const void *l2hdr
, size_t l2hdr_len
)
317 uint8_t *proto_ptr
= (uint8_t *) l2hdr
+ l2hdr_len
- sizeof(uint16_t);
318 return be16_to_cpup((uint16_t *)proto_ptr
);
321 void eth_setup_vlan_headers(struct eth_header
*ehdr
, uint16_t vlan_tag
,
324 uint8_t eth_get_gso_type(uint16_t l3_proto
, uint8_t *l3_hdr
, uint8_t l4proto
);
326 void eth_get_protocols(const uint8_t *headers
,
328 bool *isip4
, bool *isip6
,
329 bool *isudp
, bool *istcp
);
331 void eth_setup_ip4_fragmentation(const void *l2hdr
, size_t l2hdr_len
,
332 void *l3hdr
, size_t l3hdr_len
,
333 size_t l3payload_len
,
334 size_t frag_offset
, bool more_frags
);
337 eth_fix_ip4_checksum(void *l3hdr
, size_t l3hdr_len
);
340 eth_calc_pseudo_hdr_csum(struct ip_header
*iphdr
, uint16_t csl
);
343 eth_parse_ipv6_hdr(struct iovec
*pkt
, int pkt_frags
,
344 size_t ip6hdr_off
, uint8_t *l4proto
,
345 size_t *full_hdr_len
);