1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #ifndef _INET_IP_IMPL_H
27 #define _INET_IP_IMPL_H
28
29 /*
30 * IP implementation private declarations. These interfaces are
31 * used to build the IP module and are not meant to be accessed
32 * by any modules except IP itself. They are undocumented and are
33 * subject to change without notice.
34 */
35
36 #ifdef __cplusplus
37 extern "C" {
38 #endif
39
40 #ifdef _KERNEL
41
42 #include <sys/sdt.h>
43 #include <sys/dld.h>
44 #include <inet/tunables.h>
45
46 #define IP_MOD_ID 5701
47
48 #define INET_NAME "ip"
49
50 #ifdef _BIG_ENDIAN
51 #define IP_HDR_CSUM_TTL_ADJUST 256
52 #define IP_TCP_CSUM_COMP IPPROTO_TCP
53 #define IP_UDP_CSUM_COMP IPPROTO_UDP
54 #define IP_ICMPV6_CSUM_COMP IPPROTO_ICMPV6
55 #define IP_DCCP_CSUM_COMP IPPROTO_DCCP
56 #else
57 #define IP_HDR_CSUM_TTL_ADJUST 1
58 #define IP_TCP_CSUM_COMP (IPPROTO_TCP << 8)
59 #define IP_UDP_CSUM_COMP (IPPROTO_UDP << 8)
60 #define IP_ICMPV6_CSUM_COMP (IPPROTO_ICMPV6 << 8)
61 #define IP_DCCP_CSUM_COMP (IPPROTO_DCCP << 8)
62 #endif
63
64 #define TCP_CHECKSUM_OFFSET 16
65 #define TCP_CHECKSUM_SIZE 2
66
67 #define UDP_CHECKSUM_OFFSET 6
68 #define UDP_CHECKSUM_SIZE 2
69
70 #define ICMPV6_CHECKSUM_OFFSET 2
71 #define ICMPV6_CHECKSUM_SIZE 2
72
73 #define DCCP_CHECKSUM_OFFSET 6
74 #define DCCP_CHECKSUM_SIZE 2
75
76 #define IPH_TCPH_CHECKSUMP(ipha, hlen) \
77 ((uint16_t *)(((uchar_t *)(ipha)) + ((hlen) + TCP_CHECKSUM_OFFSET)))
78
79 #define IPH_UDPH_CHECKSUMP(ipha, hlen) \
80 ((uint16_t *)(((uchar_t *)(ipha)) + ((hlen) + UDP_CHECKSUM_OFFSET)))
81
82 #define IPH_ICMPV6_CHECKSUMP(ipha, hlen) \
83 ((uint16_t *)(((uchar_t *)(ipha)) + ((hlen) + ICMPV6_CHECKSUM_OFFSET)))
84
85 #define IPH_DCCPH_CHECKSUMP(ipha, hlen) \
86 ((uint16_t *)(((uchar_t *)(ipha)) + ((hlen) + DCCP_CHECKSUM_OFFSET)))
87
88 #define ILL_HCKSUM_CAPABLE(ill) \
89 (((ill)->ill_capabilities & ILL_CAPAB_HCKSUM) != 0)
90
91 /*
92 * Macro to adjust a given checksum value depending on any prepended
93 * or postpended data on the packet. It expects the start offset to
94 * begin at an even boundary and that the packet consists of at most
95 * two mblks.
96 */
97 #define IP_ADJCKSUM_PARTIAL(cksum_start, mp, mp1, len, adj) { \
98 /* \
99 * Prepended extraneous data; adjust checksum. \
100 */ \
101 if ((len) > 0) \
102 (adj) = IP_BCSUM_PARTIAL(cksum_start, len, 0); \
103 else \
104 (adj) = 0; \
105 /* \
106 * len is now the total length of mblk(s) \
107 */ \
108 (len) = MBLKL(mp); \
109 if ((mp1) == NULL) \
110 (mp1) = (mp); \
111 else \
112 (len) += MBLKL(mp1); \
113 /* \
114 * Postpended extraneous data; adjust checksum. \
115 */ \
116 if (((len) = (DB_CKSUMEND(mp) - len)) > 0) { \
117 uint32_t _pad; \
118 \
119 _pad = IP_BCSUM_PARTIAL((mp1)->b_wptr, len, 0); \
120 /* \
121 * If the postpended extraneous data was odd \
122 * byte aligned, swap resulting checksum bytes. \
123 */ \
124 if ((uintptr_t)(mp1)->b_wptr & 1) \
125 (adj) += ((_pad << 8) & 0xFFFF) | (_pad >> 8); \
126 else \
127 (adj) += _pad; \
128 (adj) = ((adj) & 0xFFFF) + ((int)(adj) >> 16); \
129 } \
130 }
131
132 #define IS_SIMPLE_IPH(ipha) \
133 ((ipha)->ipha_version_and_hdr_length == IP_SIMPLE_HDR_VERSION)
134
135 /*
136 * Currently supported flags for LSO.
137 */
138 #define LSO_BASIC_TCP_IPV4 DLD_LSO_BASIC_TCP_IPV4
139 #define LSO_BASIC_TCP_IPV6 DLD_LSO_BASIC_TCP_IPV6
140
141 #define ILL_LSO_CAPABLE(ill) \
142 (((ill)->ill_capabilities & ILL_CAPAB_LSO) != 0)
143
144 #define ILL_LSO_USABLE(ill) \
145 (ILL_LSO_CAPABLE(ill) && \
146 ill->ill_lso_capab != NULL)
147
148 #define ILL_LSO_TCP_IPV4_USABLE(ill) \
149 (ILL_LSO_USABLE(ill) && \
150 ill->ill_lso_capab->ill_lso_flags & LSO_BASIC_TCP_IPV4)
151
152 #define ILL_LSO_TCP_IPV6_USABLE(ill) \
153 (ILL_LSO_USABLE(ill) && \
154 ill->ill_lso_capab->ill_lso_flags & LSO_BASIC_TCP_IPV6)
155
156 #define ILL_ZCOPY_CAPABLE(ill) \
157 (((ill)->ill_capabilities & ILL_CAPAB_ZEROCOPY) != 0)
158
159 #define ILL_ZCOPY_USABLE(ill) \
160 (ILL_ZCOPY_CAPABLE(ill) && (ill->ill_zerocopy_capab != NULL) && \
161 (ill->ill_zerocopy_capab->ill_zerocopy_flags != 0))
162
163
164 /* Macro that follows definitions of flags for mac_tx() (see mac_client.h) */
165 #define IP_DROP_ON_NO_DESC 0x01 /* Equivalent to MAC_DROP_ON_NO_DESC */
166
167 #define ILL_DIRECT_CAPABLE(ill) \
168 (((ill)->ill_capabilities & ILL_CAPAB_DLD_DIRECT) != 0)
169
170 /* This macro is used by the mac layer */
171 #define MBLK_RX_FANOUT_SLOWPATH(mp, ipha) \
172 (DB_TYPE(mp) != M_DATA || DB_REF(mp) != 1 || !OK_32PTR(ipha) || \
173 (((uchar_t *)ipha + IP_SIMPLE_HDR_LENGTH) >= (mp)->b_wptr))
174
175 /*
176 * In non-global zone exclusive IP stacks, data structures such as IRE
177 * entries pretend that they're in the global zone. The following
178 * macro evaluates to the real zoneid instead of a pretend
179 * GLOBAL_ZONEID.
180 */
181 #define IP_REAL_ZONEID(zoneid, ipst) \
182 (((zoneid) == GLOBAL_ZONEID) ? \
183 netstackid_to_zoneid((ipst)->ips_netstack->netstack_stackid) : \
184 (zoneid))
185
186 extern void ill_flow_enable(void *, ip_mac_tx_cookie_t);
187 extern zoneid_t ip_get_zoneid_v4(ipaddr_t, mblk_t *, ip_recv_attr_t *,
188 zoneid_t);
189 extern zoneid_t ip_get_zoneid_v6(in6_addr_t *, mblk_t *, const ill_t *,
190 ip_recv_attr_t *, zoneid_t);
191 extern void conn_ire_revalidate(conn_t *, void *);
192 extern void ip_ire_unbind_walker(ire_t *, void *);
193 extern void ip_ire_rebind_walker(ire_t *, void *);
194
195 /*
196 * flag passed in by IP based protocols to get a private ip stream with
197 * no conn_t. Note this flag has the same value as SO_FALLBACK
198 */
199 #define IP_HELPER_STR SO_FALLBACK
200
201 #define IP_MOD_MINPSZ 1
202 #define IP_MOD_MAXPSZ INFPSZ
203 #define IP_MOD_HIWAT 65536
204 #define IP_MOD_LOWAT 1024
205
206 #define DEV_IP "/devices/pseudo/ip@0:ip"
207 #define DEV_IP6 "/devices/pseudo/ip6@0:ip6"
208
209 #endif /* _KERNEL */
210
211 #ifdef __cplusplus
212 }
213 #endif
214
215 #endif /* _INET_IP_IMPL_H */