1 /*-
2 * Copyright (c) 2010-2011 Juniper Networks, Inc.
3 * All rights reserved.
4 *
5 * This software was developed by Robert N. M. Watson under contract
6 * to Juniper Networks, Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31
32 __FBSDID("$FreeBSD: stable/10/sys/netinet6/in6_pcbgroup.c 222748 2011-06-06 12:55:02Z rwatson $");
33
34 #include "opt_inet6.h"
35
36 #include <sys/param.h>
37 #include <sys/mbuf.h>
38
39 #include <netinet/in.h>
40 #include <netinet/in_pcb.h>
41 #ifdef INET6
42 #include <netinet6/in6_pcb.h>
43 #endif /* INET6 */
44
45 /*
46 * Given a hash of whatever the covered tuple might be, return a pcbgroup
47 * index.
48 */
49 static __inline u_int
in6_pcbgroup_getbucket(struct inpcbinfo * pcbinfo,uint32_t hash)50 in6_pcbgroup_getbucket(struct inpcbinfo *pcbinfo, uint32_t hash)
51 {
52
53 return (hash % pcbinfo->ipi_npcbgroups);
54 }
55
56 /*
57 * Map a (hashtype, hash) tuple into a connection group, or NULL if the hash
58 * information is insufficient to identify the pcbgroup.
59 */
60 struct inpcbgroup *
in6_pcbgroup_byhash(struct inpcbinfo * pcbinfo,u_int hashtype,uint32_t hash)61 in6_pcbgroup_byhash(struct inpcbinfo *pcbinfo, u_int hashtype, uint32_t hash)
62 {
63
64 return (NULL);
65 }
66
67 struct inpcbgroup *
in6_pcbgroup_bymbuf(struct inpcbinfo * pcbinfo,struct mbuf * m)68 in6_pcbgroup_bymbuf(struct inpcbinfo *pcbinfo, struct mbuf *m)
69 {
70
71 return (in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
72 m->m_pkthdr.flowid));
73 }
74
75 struct inpcbgroup *
in6_pcbgroup_bytuple(struct inpcbinfo * pcbinfo,const struct in6_addr * laddrp,u_short lport,const struct in6_addr * faddrp,u_short fport)76 in6_pcbgroup_bytuple(struct inpcbinfo *pcbinfo, const struct in6_addr *laddrp,
77 u_short lport, const struct in6_addr *faddrp, u_short fport)
78 {
79 uint32_t hash;
80
81 switch (pcbinfo->ipi_hashfields) {
82 case IPI_HASHFIELDS_4TUPLE:
83 hash = faddrp->s6_addr32[3] ^ fport;
84 break;
85
86 case IPI_HASHFIELDS_2TUPLE:
87 hash = faddrp->s6_addr32[3] ^ laddrp->s6_addr32[3];
88 break;
89
90 default:
91 hash = 0;
92 }
93 return (&pcbinfo->ipi_pcbgroups[in6_pcbgroup_getbucket(pcbinfo,
94 hash)]);
95 }
96
97 struct inpcbgroup *
in6_pcbgroup_byinpcb(struct inpcb * inp)98 in6_pcbgroup_byinpcb(struct inpcb *inp)
99 {
100
101 return (in6_pcbgroup_bytuple(inp->inp_pcbinfo, &inp->in6p_laddr,
102 inp->inp_lport, &inp->in6p_faddr, inp->inp_fport));
103 }
104