Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * DECnet An implementation of the DECnet protocol suite for the LINUX |
| 4 | * operating system. DECnet is implemented using the BSD Socket |
| 5 | * interface as the means of communication with the user level. |
| 6 | * |
| 7 | * DECnet Routing Forwarding Information Base (Rules) |
| 8 | * |
| 9 | * Author: Steve Whitehouse <SteveW@ACM.org> |
| 10 | * Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c |
| 11 | * |
| 12 | * |
| 13 | * Changes: |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 14 | * Steve Whitehouse <steve@chygwyn.com> |
| 15 | * Updated for Thomas Graf's generic rules |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | * |
| 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/net.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/netlink.h> |
| 21 | #include <linux/rtnetlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/netdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/spinlock.h> |
Steven Whitehouse | ecba320 | 2006-03-20 22:43:28 -0800 | [diff] [blame] | 24 | #include <linux/list.h> |
| 25 | #include <linux/rcupdate.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 26 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <net/neighbour.h> |
| 28 | #include <net/dst.h> |
| 29 | #include <net/flow.h> |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 30 | #include <net/fib_rules.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <net/dn.h> |
| 32 | #include <net/dn_fib.h> |
| 33 | #include <net/dn_neigh.h> |
| 34 | #include <net/dn_dev.h> |
Thomas Graf | 73417f6 | 2007-03-27 13:56:52 -0700 | [diff] [blame] | 35 | #include <net/dn_route.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
Eric W. Biederman | e9c5158 | 2009-12-03 12:22:55 -0800 | [diff] [blame] | 37 | static struct fib_rules_ops *dn_fib_rules_ops; |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | struct dn_fib_rule |
| 40 | { |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 41 | struct fib_rule common; |
| 42 | unsigned char dst_len; |
| 43 | unsigned char src_len; |
| 44 | __le16 src; |
| 45 | __le16 srcmask; |
| 46 | __le16 dst; |
| 47 | __le16 dstmask; |
| 48 | __le16 srcmap; |
| 49 | u8 flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | }; |
| 51 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 52 | |
David S. Miller | bef55ae | 2011-03-12 17:17:10 -0500 | [diff] [blame] | 53 | int dn_fib_lookup(struct flowidn *flp, struct dn_fib_res *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | { |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 55 | struct fib_lookup_arg arg = { |
| 56 | .result = res, |
| 57 | }; |
| 58 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
David S. Miller | bef55ae | 2011-03-12 17:17:10 -0500 | [diff] [blame] | 60 | err = fib_rules_lookup(dn_fib_rules_ops, |
| 61 | flowidn_to_flowi(flp), 0, &arg); |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 62 | res->r = arg.rule; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | return err; |
| 65 | } |
| 66 | |
Adrian Bunk | 2aa7f36 | 2006-08-14 23:55:20 -0700 | [diff] [blame] | 67 | static int dn_fib_rule_action(struct fib_rule *rule, struct flowi *flp, |
| 68 | int flags, struct fib_lookup_arg *arg) |
Steven Whitehouse | ecba320 | 2006-03-20 22:43:28 -0800 | [diff] [blame] | 69 | { |
David S. Miller | bef55ae | 2011-03-12 17:17:10 -0500 | [diff] [blame] | 70 | struct flowidn *fld = &flp->u.dn; |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 71 | int err = -EAGAIN; |
| 72 | struct dn_fib_table *tbl; |
Steven Whitehouse | ecba320 | 2006-03-20 22:43:28 -0800 | [diff] [blame] | 73 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 74 | switch(rule->action) { |
| 75 | case FR_ACT_TO_TBL: |
| 76 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 78 | case FR_ACT_UNREACHABLE: |
| 79 | err = -ENETUNREACH; |
| 80 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 82 | case FR_ACT_PROHIBIT: |
| 83 | err = -EACCES; |
| 84 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 86 | case FR_ACT_BLACKHOLE: |
| 87 | default: |
| 88 | err = -EINVAL; |
| 89 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | } |
| 91 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 92 | tbl = dn_fib_get_table(rule->table, 0); |
| 93 | if (tbl == NULL) |
| 94 | goto errout; |
Steven Whitehouse | ecba320 | 2006-03-20 22:43:28 -0800 | [diff] [blame] | 95 | |
David S. Miller | bef55ae | 2011-03-12 17:17:10 -0500 | [diff] [blame] | 96 | err = tbl->lookup(tbl, fld, (struct dn_fib_res *)arg->result); |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 97 | if (err > 0) |
| 98 | err = -EAGAIN; |
| 99 | errout: |
| 100 | return err; |
| 101 | } |
| 102 | |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 103 | static const struct nla_policy dn_fib_rule_policy[FRA_MAX+1] = { |
Thomas Graf | 1f6c955 | 2006-11-09 15:22:48 -0800 | [diff] [blame] | 104 | FRA_GENERIC_POLICY, |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 105 | }; |
| 106 | |
| 107 | static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) |
| 108 | { |
| 109 | struct dn_fib_rule *r = (struct dn_fib_rule *)rule; |
David S. Miller | bef55ae | 2011-03-12 17:17:10 -0500 | [diff] [blame] | 110 | struct flowidn *fld = &fl->u.dn; |
| 111 | __le16 daddr = fld->daddr; |
| 112 | __le16 saddr = fld->saddr; |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 113 | |
| 114 | if (((saddr ^ r->src) & r->srcmask) || |
| 115 | ((daddr ^ r->dst) & r->dstmask)) |
| 116 | return 0; |
| 117 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 118 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | } |
| 120 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 121 | static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb, |
Rami Rosen | 8b3521e | 2009-05-11 05:52:49 +0000 | [diff] [blame] | 122 | struct fib_rule_hdr *frh, |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 123 | struct nlattr **tb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | { |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 125 | int err = -EINVAL; |
| 126 | struct dn_fib_rule *r = (struct dn_fib_rule *)rule; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 128 | if (frh->tos) |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 129 | goto errout; |
Steven Whitehouse | ecba320 | 2006-03-20 22:43:28 -0800 | [diff] [blame] | 130 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 131 | if (rule->table == RT_TABLE_UNSPEC) { |
| 132 | if (rule->action == FR_ACT_TO_TBL) { |
| 133 | struct dn_fib_table *table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 135 | table = dn_fib_empty_table(); |
| 136 | if (table == NULL) { |
| 137 | err = -ENOBUFS; |
| 138 | goto errout; |
| 139 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 141 | rule->table = table->n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | } |
| 143 | } |
| 144 | |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 145 | if (frh->src_len) |
Al Viro | 2835fdf | 2007-02-09 18:13:37 +0000 | [diff] [blame] | 146 | r->src = nla_get_le16(tb[FRA_SRC]); |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 147 | |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 148 | if (frh->dst_len) |
Al Viro | 2835fdf | 2007-02-09 18:13:37 +0000 | [diff] [blame] | 149 | r->dst = nla_get_le16(tb[FRA_DST]); |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 150 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 151 | r->src_len = frh->src_len; |
| 152 | r->srcmask = dnet_make_mask(r->src_len); |
| 153 | r->dst_len = frh->dst_len; |
| 154 | r->dstmask = dnet_make_mask(r->dst_len); |
| 155 | err = 0; |
| 156 | errout: |
| 157 | return err; |
| 158 | } |
| 159 | |
| 160 | static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, |
| 161 | struct nlattr **tb) |
| 162 | { |
| 163 | struct dn_fib_rule *r = (struct dn_fib_rule *)rule; |
| 164 | |
| 165 | if (frh->src_len && (r->src_len != frh->src_len)) |
| 166 | return 0; |
| 167 | |
| 168 | if (frh->dst_len && (r->dst_len != frh->dst_len)) |
| 169 | return 0; |
| 170 | |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 171 | if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC]))) |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 172 | return 0; |
| 173 | |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 174 | if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST]))) |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 175 | return 0; |
| 176 | |
| 177 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | } |
| 179 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 180 | unsigned dnet_addr_type(__le16 addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | { |
David S. Miller | bef55ae | 2011-03-12 17:17:10 -0500 | [diff] [blame] | 182 | struct flowidn fld = { .daddr = addr }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | struct dn_fib_res res; |
| 184 | unsigned ret = RTN_UNICAST; |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 185 | struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
| 187 | res.r = NULL; |
| 188 | |
| 189 | if (tb) { |
David S. Miller | bef55ae | 2011-03-12 17:17:10 -0500 | [diff] [blame] | 190 | if (!tb->lookup(tb, &fld, &res)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | ret = res.type; |
| 192 | dn_fib_res_put(&res); |
| 193 | } |
| 194 | } |
| 195 | return ret; |
| 196 | } |
| 197 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 198 | static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb, |
Rami Rosen | 04af8cf | 2009-05-20 17:26:23 -0700 | [diff] [blame] | 199 | struct fib_rule_hdr *frh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | { |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 201 | struct dn_fib_rule *r = (struct dn_fib_rule *)rule; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 203 | frh->dst_len = r->dst_len; |
| 204 | frh->src_len = r->src_len; |
| 205 | frh->tos = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 207 | if (r->dst_len) |
Al Viro | 2835fdf | 2007-02-09 18:13:37 +0000 | [diff] [blame] | 208 | NLA_PUT_LE16(skb, FRA_DST, r->dst); |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 209 | if (r->src_len) |
Al Viro | 2835fdf | 2007-02-09 18:13:37 +0000 | [diff] [blame] | 210 | NLA_PUT_LE16(skb, FRA_SRC, r->src); |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 211 | |
| 212 | return 0; |
| 213 | |
| 214 | nla_put_failure: |
| 215 | return -ENOBUFS; |
| 216 | } |
| 217 | |
Denis V. Lunev | ae299fc | 2008-07-05 19:01:28 -0700 | [diff] [blame] | 218 | static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops) |
Thomas Graf | 73417f6 | 2007-03-27 13:56:52 -0700 | [diff] [blame] | 219 | { |
Thomas Graf | 4b19ca4 | 2007-03-28 14:18:52 -0700 | [diff] [blame] | 220 | dn_rt_cache_flush(-1); |
Thomas Graf | 73417f6 | 2007-03-27 13:56:52 -0700 | [diff] [blame] | 221 | } |
| 222 | |
Patrick McHardy | 3d0c9c4 | 2010-04-26 16:02:04 +0200 | [diff] [blame] | 223 | static const struct fib_rules_ops __net_initdata dn_fib_rules_ops_template = { |
Patrick McHardy | 25239ce | 2010-04-26 16:02:05 +0200 | [diff] [blame] | 224 | .family = AF_DECnet, |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 225 | .rule_size = sizeof(struct dn_fib_rule), |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 226 | .addr_size = sizeof(u16), |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 227 | .action = dn_fib_rule_action, |
| 228 | .match = dn_fib_rule_match, |
| 229 | .configure = dn_fib_rule_configure, |
| 230 | .compare = dn_fib_rule_compare, |
| 231 | .fill = dn_fib_rule_fill, |
Patrick McHardy | d8a566b | 2010-04-13 05:03:15 +0000 | [diff] [blame] | 232 | .default_pref = fib_default_rule_pref, |
Thomas Graf | 73417f6 | 2007-03-27 13:56:52 -0700 | [diff] [blame] | 233 | .flush_cache = dn_fib_rule_flush_cache, |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 234 | .nlgroup = RTNLGRP_DECnet_RULE, |
| 235 | .policy = dn_fib_rule_policy, |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 236 | .owner = THIS_MODULE, |
Denis V. Lunev | 0359238 | 2008-01-20 16:46:01 -0800 | [diff] [blame] | 237 | .fro_net = &init_net, |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 238 | }; |
| 239 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | void __init dn_fib_rules_init(void) |
| 241 | { |
Eric W. Biederman | e9c5158 | 2009-12-03 12:22:55 -0800 | [diff] [blame] | 242 | dn_fib_rules_ops = |
| 243 | fib_rules_register(&dn_fib_rules_ops_template, &init_net); |
| 244 | BUG_ON(IS_ERR(dn_fib_rules_ops)); |
| 245 | BUG_ON(fib_default_rule_add(dn_fib_rules_ops, 0x7fff, |
Denis V. Lunev | 2994c638 | 2007-11-10 22:12:03 -0800 | [diff] [blame] | 246 | RT_TABLE_MAIN, 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
| 248 | |
| 249 | void __exit dn_fib_rules_cleanup(void) |
| 250 | { |
Eric W. Biederman | e9c5158 | 2009-12-03 12:22:55 -0800 | [diff] [blame] | 251 | fib_rules_unregister(dn_fib_rules_ops); |
| 252 | rcu_barrier(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | |