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annotate packages/net/bsd_tcpip/current/src/sys/netinet/ip_flow.c @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents a571341dd6e5
children
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1 //==========================================================================
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2 //
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3 // src/sys/netinet/ip_flow.c
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4 //
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5 //==========================================================================
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6 // ####BSDCOPYRIGHTBEGIN####
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7 // -------------------------------------------
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8 // This file is part of eCos, the Embedded Configurable Operating System.
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9 //
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10 // Portions of this software may have been derived from FreeBSD
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11 // or other sources, and if so are covered by the appropriate copyright
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12 // and license included herein.
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13 //
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14 // Portions created by the Free Software Foundation are
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15 // Copyright (C) 2002 Free Software Foundation, Inc.
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16 // -------------------------------------------
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17 // ####BSDCOPYRIGHTEND####
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18 //==========================================================================
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19
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20 /*-
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21 * Copyright (c) 1998 The NetBSD Foundation, Inc.
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22 * All rights reserved.
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23 *
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24 * This code is derived from software contributed to The NetBSD Foundation
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25 * by the 3am Software Foundry ("3am"). It was developed by Matt Thomas.
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26 *
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27 * Redistribution and use in source and binary forms, with or without
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28 * modification, are permitted provided that the following conditions
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29 * are met:
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30 * 1. Redistributions of source code must retain the above copyright
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31 * notice, this list of conditions and the following disclaimer.
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32 * 2. Redistributions in binary form must reproduce the above copyright
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33 * notice, this list of conditions and the following disclaimer in the
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34 * documentation and/or other materials provided with the distribution.
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35 * 3. All advertising materials mentioning features or use of this software
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36 * must display the following acknowledgement:
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37 * This product includes software developed by the NetBSD
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38 * Foundation, Inc. and its contributors.
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39 * 4. Neither the name of The NetBSD Foundation nor the names of its
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40 * contributors may be used to endorse or promote products derived
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41 * from this software without specific prior written permission.
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42 *
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43 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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44 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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45 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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46 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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47 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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48 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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49 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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50 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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51 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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52 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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53 * POSSIBILITY OF SUCH DAMAGE.
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54 *
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55 * $FreeBSD: src/sys/netinet/ip_flow.c,v 1.9.2.1 2001/08/08 08:20:35 ru Exp $
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56 */
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57
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58 #include <sys/param.h>
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59 #include <sys/malloc.h>
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60 #include <sys/mbuf.h>
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61 #include <sys/protosw.h>
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62 #include <sys/socket.h>
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63
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64 #include <sys/sysctl.h>
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65
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66 #include <net/if.h>
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67 #include <net/route.h>
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68
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69 #include <netinet/in.h>
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70 #include <netinet/in_systm.h>
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71 #include <netinet/ip.h>
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72 #include <netinet/in_var.h>
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73 #include <netinet/ip_var.h>
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74 #include <netinet/ip_flow.h>
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75
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76 #define IPFLOW_TIMER (5 * PR_SLOWHZ)
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77 #define IPFLOW_HASHBITS 6 /* should not be a multiple of 8 */
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78 #define IPFLOW_HASHSIZE (1 << IPFLOW_HASHBITS)
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79 static LIST_HEAD(ipflowhead, ipflow) ipflows[IPFLOW_HASHSIZE];
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80 static int ipflow_inuse;
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81 #define IPFLOW_MAX 256
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82
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83 static int ipflow_active = 0;
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84 SYSCTL_INT(_net_inet_ip, IPCTL_FASTFORWARDING, fastforwarding, CTLFLAG_RW,
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85 &ipflow_active, 0, "Enable flow-based IP forwarding");
208
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86
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87 static unsigned
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88 ipflow_hash(
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89 struct in_addr dst,
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90 struct in_addr src,
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91 unsigned tos)
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92 {
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93 unsigned hash = tos;
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94 int idx;
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95 for (idx = 0; idx < 32; idx += IPFLOW_HASHBITS)
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96 hash += (dst.s_addr >> (32 - idx)) + (src.s_addr >> idx);
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97 return hash & (IPFLOW_HASHSIZE-1);
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98 }
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99
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100 static struct ipflow *
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101 ipflow_lookup(
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102 const struct ip *ip)
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103 {
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104 unsigned hash;
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105 struct ipflow *ipf;
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106
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107 hash = ipflow_hash(ip->ip_dst, ip->ip_src, ip->ip_tos);
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108
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109 ipf = LIST_FIRST(&ipflows[hash]);
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110 while (ipf != NULL) {
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111 if (ip->ip_dst.s_addr == ipf->ipf_dst.s_addr
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112 && ip->ip_src.s_addr == ipf->ipf_src.s_addr
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113 && ip->ip_tos == ipf->ipf_tos)
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114 break;
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115 ipf = LIST_NEXT(ipf, ipf_next);
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116 }
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117 return ipf;
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118 }
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119
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120 int
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121 ipflow_fastforward(
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122 struct mbuf *m)
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123 {
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124 struct ip *ip;
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125 struct ipflow *ipf;
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126 struct rtentry *rt;
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127 struct sockaddr *dst;
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128 int error;
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129
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130 /*
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131 * Are we forwarding packets? Big enough for an IP packet?
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132 */
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133 if (!ipforwarding || !ipflow_active || m->m_len < sizeof(struct ip))
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134 return 0;
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135 /*
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136 * IP header with no option and valid version and length
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137 */
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138 ip = mtod(m, struct ip *);
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139 if (ip->ip_v != IPVERSION || ip->ip_hl != (sizeof(struct ip) >> 2)
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jlarmour
parents:
diff changeset
140 || ntohs(ip->ip_len) > m->m_pkthdr.len)
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jlarmour
parents:
diff changeset
141 return 0;
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jlarmour
parents:
diff changeset
142 /*
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jlarmour
parents:
diff changeset
143 * Find a flow.
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jlarmour
parents:
diff changeset
144 */
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jlarmour
parents:
diff changeset
145 if ((ipf = ipflow_lookup(ip)) == NULL)
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jlarmour
parents:
diff changeset
146 return 0;
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jlarmour
parents:
diff changeset
147
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jlarmour
parents:
diff changeset
148 /*
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jlarmour
parents:
diff changeset
149 * Route and interface still up?
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jlarmour
parents:
diff changeset
150 */
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jlarmour
parents:
diff changeset
151 rt = ipf->ipf_ro.ro_rt;
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diff changeset
152 if ((rt->rt_flags & RTF_UP) == 0 || (rt->rt_ifp->if_flags & IFF_UP) == 0)
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jlarmour
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diff changeset
153 return 0;
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jlarmour
parents:
diff changeset
154
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jlarmour
parents:
diff changeset
155 /*
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jlarmour
parents:
diff changeset
156 * Packet size OK? TTL?
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jlarmour
parents:
diff changeset
157 */
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jlarmour
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diff changeset
158 if (m->m_pkthdr.len > rt->rt_ifp->if_mtu || ip->ip_ttl <= IPTTLDEC)
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jlarmour
parents:
diff changeset
159 return 0;
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jlarmour
parents:
diff changeset
160
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jlarmour
parents:
diff changeset
161 /*
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jlarmour
parents:
diff changeset
162 * Everything checks out and so we can forward this packet.
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jlarmour
parents:
diff changeset
163 * Modify the TTL and incrementally change the checksum.
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jlarmour
parents:
diff changeset
164 */
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jlarmour
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165 ip->ip_ttl -= IPTTLDEC;
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jlarmour
parents:
diff changeset
166 if (ip->ip_sum >= htons(0xffff - (IPTTLDEC << 8))) {
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jlarmour
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167 ip->ip_sum += htons(IPTTLDEC << 8) + 1;
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jlarmour
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diff changeset
168 } else {
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jlarmour
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diff changeset
169 ip->ip_sum += htons(IPTTLDEC << 8);
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jlarmour
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170 }
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jlarmour
parents:
diff changeset
171
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jlarmour
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172 /*
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jlarmour
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diff changeset
173 * Send the packet on its way. All we can get back is ENOBUFS
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174 */
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jlarmour
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diff changeset
175 ipf->ipf_uses++;
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176 ipf->ipf_timer = IPFLOW_TIMER;
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diff changeset
177
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178 if (rt->rt_flags & RTF_GATEWAY)
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179 dst = rt->rt_gateway;
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180 else
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181 dst = &ipf->ipf_ro.ro_dst;
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182 if ((error = (*rt->rt_ifp->if_output)(rt->rt_ifp, m, dst, rt)) != 0) {
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jlarmour
parents:
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183 if (error == ENOBUFS)
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184 ipf->ipf_dropped++;
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185 else
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diff changeset
186 ipf->ipf_errors++;
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diff changeset
187 }
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188 return 1;
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189 }
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jlarmour
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diff changeset
190
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jlarmour
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diff changeset
191 static void
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diff changeset
192 ipflow_addstats(
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jlarmour
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193 struct ipflow *ipf)
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194 {
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195 ipf->ipf_ro.ro_rt->rt_use += ipf->ipf_uses;
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196 ipstat.ips_cantforward += ipf->ipf_errors + ipf->ipf_dropped;
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197 ipstat.ips_forward += ipf->ipf_uses;
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198 ipstat.ips_fastforward += ipf->ipf_uses;
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diff changeset
199 }
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jlarmour
parents:
diff changeset
200
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jlarmour
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diff changeset
201 static void
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jlarmour
parents:
diff changeset
202 ipflow_free(
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jlarmour
parents:
diff changeset
203 struct ipflow *ipf)
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jlarmour
parents:
diff changeset
204 {
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jlarmour
parents:
diff changeset
205 int s;
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jlarmour
parents:
diff changeset
206 /*
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jlarmour
parents:
diff changeset
207 * Remove the flow from the hash table (at elevated IPL).
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jlarmour
parents:
diff changeset
208 * Once it's off the list, we can deal with it at normal
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jlarmour
parents:
diff changeset
209 * network IPL.
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jlarmour
parents:
diff changeset
210 */
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jlarmour
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diff changeset
211 s = splimp();
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jlarmour
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diff changeset
212 LIST_REMOVE(ipf, ipf_next);
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jlarmour
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diff changeset
213 splx(s);
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jlarmour
parents:
diff changeset
214 ipflow_addstats(ipf);
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jlarmour
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diff changeset
215 RTFREE(ipf->ipf_ro.ro_rt);
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jlarmour
parents:
diff changeset
216 ipflow_inuse--;
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jlarmour
parents:
diff changeset
217 FREE(ipf, M_IPFLOW);
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jlarmour
parents:
diff changeset
218 }
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jlarmour
parents:
diff changeset
219
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jlarmour
parents:
diff changeset
220 static struct ipflow *
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jlarmour
parents:
diff changeset
221 ipflow_reap(
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jlarmour
parents:
diff changeset
222 void)
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jlarmour
parents:
diff changeset
223 {
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jlarmour
parents:
diff changeset
224 struct ipflow *ipf, *maybe_ipf = NULL;
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jlarmour
parents:
diff changeset
225 int idx;
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jlarmour
parents:
diff changeset
226 int s;
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jlarmour
parents:
diff changeset
227
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jlarmour
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diff changeset
228 for (idx = 0; idx < IPFLOW_HASHSIZE; idx++) {
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jlarmour
parents:
diff changeset
229 ipf = LIST_FIRST(&ipflows[idx]);
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jlarmour
parents:
diff changeset
230 while (ipf != NULL) {
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jlarmour
parents:
diff changeset
231 /*
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jlarmour
parents:
diff changeset
232 * If this no longer points to a valid route
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jlarmour
parents:
diff changeset
233 * reclaim it.
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jlarmour
parents:
diff changeset
234 */
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jlarmour
parents:
diff changeset
235 if ((ipf->ipf_ro.ro_rt->rt_flags & RTF_UP) == 0)
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jlarmour
parents:
diff changeset
236 goto done;
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jlarmour
parents:
diff changeset
237 /*
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jlarmour
parents:
diff changeset
238 * choose the one that's been least recently used
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jlarmour
parents:
diff changeset
239 * or has had the least uses in the last 1.5
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jlarmour
parents:
diff changeset
240 * intervals.
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jlarmour
parents:
diff changeset
241 */
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jlarmour
parents:
diff changeset
242 if (maybe_ipf == NULL
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jlarmour
parents:
diff changeset
243 || ipf->ipf_timer < maybe_ipf->ipf_timer
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parents:
diff changeset
244 || (ipf->ipf_timer == maybe_ipf->ipf_timer
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jlarmour
parents:
diff changeset
245 && ipf->ipf_last_uses + ipf->ipf_uses <
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jlarmour
parents:
diff changeset
246 maybe_ipf->ipf_last_uses +
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jlarmour
parents:
diff changeset
247 maybe_ipf->ipf_uses))
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jlarmour
parents:
diff changeset
248 maybe_ipf = ipf;
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jlarmour
parents:
diff changeset
249 ipf = LIST_NEXT(ipf, ipf_next);
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jlarmour
parents:
diff changeset
250 }
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jlarmour
parents:
diff changeset
251 }
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jlarmour
parents:
diff changeset
252 ipf = maybe_ipf;
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jlarmour
parents:
diff changeset
253 done:
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jlarmour
parents:
diff changeset
254 /*
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jlarmour
parents:
diff changeset
255 * Remove the entry from the flow table.
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jlarmour
parents:
diff changeset
256 */
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jlarmour
parents:
diff changeset
257 s = splimp();
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jlarmour
parents:
diff changeset
258 LIST_REMOVE(ipf, ipf_next);
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jlarmour
parents:
diff changeset
259 splx(s);
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jlarmour
parents:
diff changeset
260 ipflow_addstats(ipf);
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jlarmour
parents:
diff changeset
261 RTFREE(ipf->ipf_ro.ro_rt);
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jlarmour
parents:
diff changeset
262 return ipf;
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jlarmour
parents:
diff changeset
263 }
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jlarmour
parents:
diff changeset
264
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jlarmour
parents:
diff changeset
265 void
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jlarmour
parents:
diff changeset
266 ipflow_slowtimo(
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jlarmour
parents:
diff changeset
267 void)
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jlarmour
parents:
diff changeset
268 {
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jlarmour
parents:
diff changeset
269 struct ipflow *ipf;
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jlarmour
parents:
diff changeset
270 int idx;
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jlarmour
parents:
diff changeset
271
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jlarmour
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diff changeset
272 for (idx = 0; idx < IPFLOW_HASHSIZE; idx++) {
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jlarmour
parents:
diff changeset
273 ipf = LIST_FIRST(&ipflows[idx]);
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jlarmour
parents:
diff changeset
274 while (ipf != NULL) {
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jlarmour
parents:
diff changeset
275 struct ipflow *next_ipf = LIST_NEXT(ipf, ipf_next);
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jlarmour
parents:
diff changeset
276 if (--ipf->ipf_timer == 0) {
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jlarmour
parents:
diff changeset
277 ipflow_free(ipf);
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jlarmour
parents:
diff changeset
278 } else {
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jlarmour
parents:
diff changeset
279 ipf->ipf_last_uses = ipf->ipf_uses;
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parents:
diff changeset
280 ipf->ipf_ro.ro_rt->rt_use += ipf->ipf_uses;
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jlarmour
parents:
diff changeset
281 ipstat.ips_forward += ipf->ipf_uses;
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jlarmour
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282 ipstat.ips_fastforward += ipf->ipf_uses;
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283 ipf->ipf_uses = 0;
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284 }
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285 ipf = next_ipf;
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286 }
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287 }
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288 }
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289
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290 void
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291 ipflow_create(
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292 const struct route *ro,
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293 struct mbuf *m)
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294 {
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295 const struct ip *const ip = mtod(m, struct ip *);
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296 struct ipflow *ipf;
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297 unsigned hash;
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298 int s;
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299
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300 /*
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301 * Don't create cache entries for ICMP messages.
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302 */
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303 if (!ipflow_active || ip->ip_p == IPPROTO_ICMP)
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304 return;
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305 /*
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306 * See if an existing flow struct exists. If so remove it from it's
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307 * list and free the old route. If not, try to malloc a new one
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308 * (if we aren't at our limit).
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309 */
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310 ipf = ipflow_lookup(ip);
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311 if (ipf == NULL) {
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312 if (ipflow_inuse == IPFLOW_MAX) {
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313 ipf = ipflow_reap();
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314 } else {
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315 ipf = (struct ipflow *) malloc(sizeof(*ipf), M_IPFLOW,
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316 M_NOWAIT);
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317 if (ipf == NULL)
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318 return;
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319 ipflow_inuse++;
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320 }
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321 bzero((caddr_t) ipf, sizeof(*ipf));
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322 } else {
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323 s = splimp();
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324 LIST_REMOVE(ipf, ipf_next);
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325 splx(s);
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326 ipflow_addstats(ipf);
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327 RTFREE(ipf->ipf_ro.ro_rt);
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328 ipf->ipf_uses = ipf->ipf_last_uses = 0;
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329 ipf->ipf_errors = ipf->ipf_dropped = 0;
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330 }
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331
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332 /*
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333 * Fill in the updated information.
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334 */
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335 ipf->ipf_ro = *ro;
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336 ro->ro_rt->rt_refcnt++;
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337 ipf->ipf_dst = ip->ip_dst;
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338 ipf->ipf_src = ip->ip_src;
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339 ipf->ipf_tos = ip->ip_tos;
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340 ipf->ipf_timer = IPFLOW_TIMER;
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341 /*
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342 * Insert into the approriate bucket of the flow table.
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343 */
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344 hash = ipflow_hash(ip->ip_dst, ip->ip_src, ip->ip_tos);
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345 s = splimp();
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346 LIST_INSERT_HEAD(&ipflows[hash], ipf, ipf_next);
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347 splx(s);
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348 }