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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | /* * IP_ALIAS (AF_INET) aliasing module. * * * Version: @(#)ip_alias.c 0.43 12/20/95 * * Author: Juan Jose Ciarlante, <jjciarla@raiz.uncu.edu.ar> * * Fixes: * JJC : ip_alias_dev_select method. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #include <linux/module.h> #include <linux/types.h> #include <linux/errno.h> #include <linux/netdevice.h> #include <linux/if.h> #include <linux/inet.h> #include <linux/in.h> #include <linux/ip.h> #include <linux/route.h> #include <net/route.h> #ifdef ALIAS_USER_LAND_DEBUG #include "net_alias.h" #include "ip_alias.h" #include "user_stubs.h" #endif #include <linux/net_alias.h> #include <net/ip_alias.h> /* * AF_INET alias init */ static int ip_alias_init_1(struct net_alias_type *this, struct net_alias *alias, struct sockaddr *sa) { #ifdef ALIAS_USER_LAND_DEBUG printk("alias_init(%s) called.\n", alias->name); #endif MOD_INC_USE_COUNT; return 0; } /* * AF_INET alias done */ static int ip_alias_done_1(struct net_alias_type *this, struct net_alias *alias) { #ifdef ALIAS_USER_LAND_DEBUG printk("alias_done(%s) called.\n", alias->name); #endif MOD_DEC_USE_COUNT; return 0; } /* * Print alias address info */ int ip_alias_print_1(struct net_alias_type *this, struct net_alias *alias, char *buf, int len) { char *p; p = (char *) &alias->dev.pa_addr; return sprintf(buf, "%d.%d.%d.%d", (p[0] & 255), (p[1] & 255), (p[2] & 255), (p[3] & 255)); } struct device *ip_alias_dev_select(struct net_alias_type *this, struct device *main_dev, struct sockaddr *sa) { __u32 addr; struct rtable *rt; struct device *dev=NULL; /* * Defensive... */ if (main_dev == NULL) return NULL; /* * Get u32 address. */ addr = (sa)? (*(struct sockaddr_in *)sa).sin_addr.s_addr : 0; if (addr == 0) return NULL; /* * Find 'closest' device to address given. any other suggestions? ... * net_alias module will check if returned device is main_dev's alias */ rt = ip_rt_route(addr, 0); if(rt) { dev=rt->rt_dev; ip_rt_put(rt); } return dev; } /* * net_alias AF_INET type defn. */ struct net_alias_type ip_alias_type = { AF_INET, /* type */ 0, /* n_attach */ "ip", /* name */ NULL, /* get_addr32() */ NULL, /* dev_addr_chk() */ ip_alias_dev_select, /* dev_select() */ ip_alias_init_1, /* alias_init_1() */ ip_alias_done_1, /* alias_done_1() */ ip_alias_print_1, /* alias_print_1() */ NULL /* next */ }; /* * ip_alias module initialization */ int ip_alias_init(void) { return register_net_alias_type(&ip_alias_type, AF_INET); } /* * ip_alias module done */ int ip_alias_done(void) { return unregister_net_alias_type(&ip_alias_type); } #ifdef MODULE int init_module(void) { if (ip_alias_init() != 0) return -EIO; return 0; } void cleanup_module(void) { if (ip_alias_done() != 0) printk(KERN_INFO "ip_alias: can't remove module"); } #endif /* MODULE */ |