1 /* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
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14 * permit persons to whom the Software is furnished to do so, subject to
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17 * The above copyright notice and this permission notice shall be
18 * included in all copies or substantial portions of the Software.
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22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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40 #define ETH_ADDR_LEN 6
42 static inline bool eth_addr_is_broadcast(const uint8_t ea[6])
44 return (ea[0] & ea[1] & ea[2] & ea[3] & ea[4] & ea[5]) == 0xff;
46 static inline bool eth_addr_is_multicast(const uint8_t ea[6])
50 static inline bool eth_addr_is_local(const uint8_t ea[6])
54 static inline bool eth_addr_equals(const uint8_t a[ETH_ADDR_LEN],
55 const uint8_t b[ETH_ADDR_LEN])
57 return !memcmp(a, b, ETH_ADDR_LEN);
59 #define ETH_ADDR_FMT \
60 "%02"PRIx8":%02"PRIx8":%02"PRIx8":%02"PRIx8":%02"PRIx8":%02"PRIx8
61 #define ETH_ADDR_ARGS(ea) \
62 (ea)[0], (ea)[1], (ea)[2], (ea)[3], (ea)[4], (ea)[5]
64 #define ETH_TYPE_IP 0x0800
65 #define ETH_TYPE_ARP 0x0806
66 #define ETH_TYPE_VLAN 0x8100
68 #define ETH_HEADER_LEN 14
69 #define ETH_PAYLOAD_MIN 46
70 #define ETH_TOTAL_MIN (ETH_HEADER_LEN + ETH_PAYLOAD_MIN)
71 #define ETH_TOTAL_MAX (ETH_HEADER_LEN + VLAN_HEADER_LEN + 1500)
73 uint8_t eth_dst[ETH_ADDR_LEN];
74 uint8_t eth_src[ETH_ADDR_LEN];
76 } __attribute__((packed));
77 BUILD_ASSERT_DECL(ETH_HEADER_LEN == sizeof(struct eth_header));
79 #define LLC_DSAP_SNAP 0xaa
80 #define LLC_SSAP_SNAP 0xaa
81 #define LLC_CNTL_SNAP 3
83 #define LLC_HEADER_LEN 3
88 } __attribute__((packed));
89 BUILD_ASSERT_DECL(LLC_HEADER_LEN == sizeof(struct llc_header));
91 #define SNAP_ORG_ETHERNET "\0\0" /* The compiler adds a null byte, so
92 sizeof(SNAP_ORG_ETHERNET) == 3. */
93 #define SNAP_HEADER_LEN 5
97 } __attribute__((packed));
98 BUILD_ASSERT_DECL(SNAP_HEADER_LEN == sizeof(struct snap_header));
100 #define LLC_SNAP_HEADER_LEN (LLC_HEADER_LEN + SNAP_HEADER_LEN)
101 struct llc_snap_header {
102 struct llc_header llc;
103 struct snap_header snap;
104 } __attribute__((packed));
105 BUILD_ASSERT_DECL(LLC_SNAP_HEADER_LEN == sizeof(struct llc_snap_header));
107 #define VLAN_VID 0x0fff
109 #define VLAN_HEADER_LEN 4
111 uint16_t vlan_tci; /* Lowest 12 bits are VLAN ID. */
112 uint16_t vlan_next_type;
114 BUILD_ASSERT_DECL(VLAN_HEADER_LEN == sizeof(struct vlan_header));
116 #define VLAN_ETH_HEADER_LEN (ETH_HEADER_LEN + VLAN_HEADER_LEN)
117 struct vlan_eth_header {
118 uint8_t veth_dst[ETH_ADDR_LEN];
119 uint8_t veth_src[ETH_ADDR_LEN];
120 uint16_t veth_type; /* Always htons(ETH_TYPE_VLAN). */
121 uint16_t veth_tci; /* Lowest 12 bits are VLAN ID. */
122 uint16_t veth_next_type;
123 } __attribute__((packed));
124 BUILD_ASSERT_DECL(VLAN_ETH_HEADER_LEN == sizeof(struct vlan_eth_header));
126 #define IP_FMT "%"PRIu8".%"PRIu8".%"PRIu8".%"PRIu8
127 #define IP_ARGS(ip) \
128 ((uint8_t *) ip)[0], \
129 ((uint8_t *) ip)[1], \
130 ((uint8_t *) ip)[2], \
133 #define IP_VER(ip_ihl_ver) ((ip_ihl_ver) >> 4)
134 #define IP_IHL(ip_ihl_ver) ((ip_ihl_ver) & 15)
136 #define IP_TYPE_TCP 6
137 #define IP_TYPE_UDP 17
139 #define IP_HEADER_LEN 20
145 uint16_t ip_frag_off;
152 BUILD_ASSERT_DECL(IP_HEADER_LEN == sizeof(struct ip_header));
154 #define UDP_HEADER_LEN 8
161 BUILD_ASSERT_DECL(UDP_HEADER_LEN == sizeof(struct udp_header));
170 #define TCP_FLAGS(tcp_ctl) (htons(tcp_ctl) & 0x003f)
171 #define TCP_OFFSET(tcp_ctl) (htons(tcp_ctl) >> 12)
173 #define TCP_HEADER_LEN 20
184 BUILD_ASSERT_DECL(TCP_HEADER_LEN == sizeof(struct tcp_header));
186 #define ARP_HRD_ETHERNET 1
187 #define ARP_PRO_IP 0x0800
188 #define ARP_OP_REQUEST 1
189 #define ARP_OP_REPLY 2
191 #define ARP_ETH_HEADER_LEN 28
192 struct arp_eth_header {
193 /* Generic members. */
194 uint16_t ar_hrd; /* Hardware type. */
195 uint16_t ar_pro; /* Protocol type. */
196 uint8_t ar_hln; /* Hardware address length. */
197 uint8_t ar_pln; /* Protocol address length. */
198 uint16_t ar_op; /* Opcode. */
200 /* Ethernet+IPv4 specific members. */
201 uint8_t ar_sha[ETH_ADDR_LEN]; /* Sender hardware address. */
202 uint32_t ar_spa; /* Sender protocol address. */
203 uint8_t ar_tha[ETH_ADDR_LEN]; /* Target hardware address. */
204 uint32_t ar_tpa; /* Target protocol address. */
205 } __attribute__((packed));
206 BUILD_ASSERT_DECL(ARP_ETH_HEADER_LEN == sizeof(struct arp_eth_header));
208 #endif /* packets.h */