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-rw-r--r--net/ipv4/fib_rules.c622
1 files changed, 253 insertions, 369 deletions
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index ec566f3e66c7..0852b9cd065a 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -5,9 +5,8 @@
5 * 5 *
6 * IPv4 Forwarding Information Base: policy rules. 6 * IPv4 Forwarding Information Base: policy rules.
7 * 7 *
8 * Version: $Id: fib_rules.c,v 1.17 2001/10/31 21:55:54 davem Exp $
9 *
10 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 * Thomas Graf <tgraf@suug.ch>
11 * 10 *
12 * This program is free software; you can redistribute it and/or 11 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License 12 * modify it under the terms of the GNU General Public License
@@ -19,465 +18,350 @@
19 * Marc Boucher : routing by fwmark 18 * Marc Boucher : routing by fwmark
20 */ 19 */
21 20
22#include <linux/config.h>
23#include <asm/uaccess.h>
24#include <asm/system.h>
25#include <linux/bitops.h>
26#include <linux/types.h> 21#include <linux/types.h>
27#include <linux/kernel.h> 22#include <linux/kernel.h>
28#include <linux/sched.h>
29#include <linux/mm.h>
30#include <linux/string.h>
31#include <linux/socket.h>
32#include <linux/sockios.h>
33#include <linux/errno.h>
34#include <linux/in.h>
35#include <linux/inet.h>
36#include <linux/inetdevice.h>
37#include <linux/netdevice.h> 23#include <linux/netdevice.h>
38#include <linux/if_arp.h>
39#include <linux/proc_fs.h>
40#include <linux/skbuff.h>
41#include <linux/netlink.h> 24#include <linux/netlink.h>
25#include <linux/inetdevice.h>
42#include <linux/init.h> 26#include <linux/init.h>
43#include <linux/list.h> 27#include <linux/list.h>
44#include <linux/rcupdate.h> 28#include <linux/rcupdate.h>
45
46#include <net/ip.h> 29#include <net/ip.h>
47#include <net/protocol.h>
48#include <net/route.h> 30#include <net/route.h>
49#include <net/tcp.h> 31#include <net/tcp.h>
50#include <net/sock.h>
51#include <net/ip_fib.h> 32#include <net/ip_fib.h>
33#include <net/fib_rules.h>
52 34
53#define FRprintk(a...) 35static struct fib_rules_ops fib4_rules_ops;
54 36
55struct fib_rule 37struct fib4_rule
56{ 38{
57 struct hlist_node hlist; 39 struct fib_rule common;
58 atomic_t r_clntref; 40 u8 dst_len;
59 u32 r_preference; 41 u8 src_len;
60 unsigned char r_table; 42 u8 tos;
61 unsigned char r_action; 43 __be32 src;
62 unsigned char r_dst_len; 44 __be32 srcmask;
63 unsigned char r_src_len; 45 __be32 dst;
64 u32 r_src; 46 __be32 dstmask;
65 u32 r_srcmask;
66 u32 r_dst;
67 u32 r_dstmask;
68 u32 r_srcmap;
69 u8 r_flags;
70 u8 r_tos;
71#ifdef CONFIG_IP_ROUTE_FWMARK 47#ifdef CONFIG_IP_ROUTE_FWMARK
72 u32 r_fwmark; 48 u32 fwmark;
49 u32 fwmask;
73#endif 50#endif
74 int r_ifindex;
75#ifdef CONFIG_NET_CLS_ROUTE 51#ifdef CONFIG_NET_CLS_ROUTE
76 __u32 r_tclassid; 52 u32 tclassid;
77#endif 53#endif
78 char r_ifname[IFNAMSIZ];
79 int r_dead;
80 struct rcu_head rcu;
81}; 54};
82 55
83static struct fib_rule default_rule = { 56static struct fib4_rule default_rule = {
84 .r_clntref = ATOMIC_INIT(2), 57 .common = {
85 .r_preference = 0x7FFF, 58 .refcnt = ATOMIC_INIT(2),
86 .r_table = RT_TABLE_DEFAULT, 59 .pref = 0x7FFF,
87 .r_action = RTN_UNICAST, 60 .table = RT_TABLE_DEFAULT,
61 .action = FR_ACT_TO_TBL,
62 },
88}; 63};
89 64
90static struct fib_rule main_rule = { 65static struct fib4_rule main_rule = {
91 .r_clntref = ATOMIC_INIT(2), 66 .common = {
92 .r_preference = 0x7FFE, 67 .refcnt = ATOMIC_INIT(2),
93 .r_table = RT_TABLE_MAIN, 68 .pref = 0x7FFE,
94 .r_action = RTN_UNICAST, 69 .table = RT_TABLE_MAIN,
70 .action = FR_ACT_TO_TBL,
71 },
95}; 72};
96 73
97static struct fib_rule local_rule = { 74static struct fib4_rule local_rule = {
98 .r_clntref = ATOMIC_INIT(2), 75 .common = {
99 .r_table = RT_TABLE_LOCAL, 76 .refcnt = ATOMIC_INIT(2),
100 .r_action = RTN_UNICAST, 77 .table = RT_TABLE_LOCAL,
78 .action = FR_ACT_TO_TBL,
79 .flags = FIB_RULE_PERMANENT,
80 },
101}; 81};
102 82
103static struct hlist_head fib_rules; 83static LIST_HEAD(fib4_rules);
104 84
105/* writer func called from netlink -- rtnl_sem hold*/ 85#ifdef CONFIG_NET_CLS_ROUTE
106 86u32 fib_rules_tclass(struct fib_result *res)
107static void rtmsg_rule(int, struct fib_rule *);
108
109int inet_rtm_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
110{ 87{
111 struct rtattr **rta = arg; 88 return res->r ? ((struct fib4_rule *) res->r)->tclassid : 0;
112 struct rtmsg *rtm = NLMSG_DATA(nlh);
113 struct fib_rule *r;
114 struct hlist_node *node;
115 int err = -ESRCH;
116
117 hlist_for_each_entry(r, node, &fib_rules, hlist) {
118 if ((!rta[RTA_SRC-1] || memcmp(RTA_DATA(rta[RTA_SRC-1]), &r->r_src, 4) == 0) &&
119 rtm->rtm_src_len == r->r_src_len &&
120 rtm->rtm_dst_len == r->r_dst_len &&
121 (!rta[RTA_DST-1] || memcmp(RTA_DATA(rta[RTA_DST-1]), &r->r_dst, 4) == 0) &&
122 rtm->rtm_tos == r->r_tos &&
123#ifdef CONFIG_IP_ROUTE_FWMARK
124 (!rta[RTA_PROTOINFO-1] || memcmp(RTA_DATA(rta[RTA_PROTOINFO-1]), &r->r_fwmark, 4) == 0) &&
125#endif
126 (!rtm->rtm_type || rtm->rtm_type == r->r_action) &&
127 (!rta[RTA_PRIORITY-1] || memcmp(RTA_DATA(rta[RTA_PRIORITY-1]), &r->r_preference, 4) == 0) &&
128 (!rta[RTA_IIF-1] || rtattr_strcmp(rta[RTA_IIF-1], r->r_ifname) == 0) &&
129 (!rtm->rtm_table || (r && rtm->rtm_table == r->r_table))) {
130 err = -EPERM;
131 if (r == &local_rule)
132 break;
133
134 hlist_del_rcu(&r->hlist);
135 r->r_dead = 1;
136 rtmsg_rule(RTM_DELRULE, r);
137 fib_rule_put(r);
138 err = 0;
139 break;
140 }
141 }
142 return err;
143} 89}
90#endif
144 91
145/* Allocate new unique table id */ 92int fib_lookup(struct flowi *flp, struct fib_result *res)
146
147static struct fib_table *fib_empty_table(void)
148{ 93{
149 int id; 94 struct fib_lookup_arg arg = {
95 .result = res,
96 };
97 int err;
150 98
151 for (id = 1; id <= RT_TABLE_MAX; id++) 99 err = fib_rules_lookup(&fib4_rules_ops, flp, 0, &arg);
152 if (fib_tables[id] == NULL) 100 res->r = arg.rule;
153 return __fib_new_table(id);
154 return NULL;
155}
156 101
157static inline void fib_rule_put_rcu(struct rcu_head *head) 102 return err;
158{
159 struct fib_rule *r = container_of(head, struct fib_rule, rcu);
160 kfree(r);
161} 103}
162 104
163void fib_rule_put(struct fib_rule *r) 105static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,
106 int flags, struct fib_lookup_arg *arg)
164{ 107{
165 if (atomic_dec_and_test(&r->r_clntref)) { 108 int err = -EAGAIN;
166 if (r->r_dead) 109 struct fib_table *tbl;
167 call_rcu(&r->rcu, fib_rule_put_rcu); 110
168 else 111 switch (rule->action) {
169 printk("Freeing alive rule %p\n", r); 112 case FR_ACT_TO_TBL:
113 break;
114
115 case FR_ACT_UNREACHABLE:
116 err = -ENETUNREACH;
117 goto errout;
118
119 case FR_ACT_PROHIBIT:
120 err = -EACCES;
121 goto errout;
122
123 case FR_ACT_BLACKHOLE:
124 default:
125 err = -EINVAL;
126 goto errout;
170 } 127 }
128
129 if ((tbl = fib_get_table(rule->table)) == NULL)
130 goto errout;
131
132 err = tbl->tb_lookup(tbl, flp, (struct fib_result *) arg->result);
133 if (err > 0)
134 err = -EAGAIN;
135errout:
136 return err;
171} 137}
172 138
173/* writer func called from netlink -- rtnl_sem hold*/
174 139
175int inet_rtm_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 140void fib_select_default(const struct flowi *flp, struct fib_result *res)
176{ 141{
177 struct rtattr **rta = arg; 142 if (res->r && res->r->action == FR_ACT_TO_TBL &&
178 struct rtmsg *rtm = NLMSG_DATA(nlh); 143 FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) {
179 struct fib_rule *r, *new_r, *last = NULL; 144 struct fib_table *tb;
180 struct hlist_node *node = NULL; 145 if ((tb = fib_get_table(res->r->table)) != NULL)
181 unsigned char table_id; 146 tb->tb_select_default(tb, flp, res);
182
183 if (rtm->rtm_src_len > 32 || rtm->rtm_dst_len > 32 ||
184 (rtm->rtm_tos & ~IPTOS_TOS_MASK))
185 return -EINVAL;
186
187 if (rta[RTA_IIF-1] && RTA_PAYLOAD(rta[RTA_IIF-1]) > IFNAMSIZ)
188 return -EINVAL;
189
190 table_id = rtm->rtm_table;
191 if (table_id == RT_TABLE_UNSPEC) {
192 struct fib_table *table;
193 if (rtm->rtm_type == RTN_UNICAST) {
194 if ((table = fib_empty_table()) == NULL)
195 return -ENOBUFS;
196 table_id = table->tb_id;
197 }
198 } 147 }
148}
199 149
200 new_r = kmalloc(sizeof(*new_r), GFP_KERNEL); 150static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
201 if (!new_r) 151{
202 return -ENOMEM; 152 struct fib4_rule *r = (struct fib4_rule *) rule;
203 memset(new_r, 0, sizeof(*new_r)); 153 __be32 daddr = fl->fl4_dst;
204 154 __be32 saddr = fl->fl4_src;
205 if (rta[RTA_SRC-1])
206 memcpy(&new_r->r_src, RTA_DATA(rta[RTA_SRC-1]), 4);
207 if (rta[RTA_DST-1])
208 memcpy(&new_r->r_dst, RTA_DATA(rta[RTA_DST-1]), 4);
209 if (rta[RTA_GATEWAY-1])
210 memcpy(&new_r->r_srcmap, RTA_DATA(rta[RTA_GATEWAY-1]), 4);
211 new_r->r_src_len = rtm->rtm_src_len;
212 new_r->r_dst_len = rtm->rtm_dst_len;
213 new_r->r_srcmask = inet_make_mask(rtm->rtm_src_len);
214 new_r->r_dstmask = inet_make_mask(rtm->rtm_dst_len);
215 new_r->r_tos = rtm->rtm_tos;
216#ifdef CONFIG_IP_ROUTE_FWMARK
217 if (rta[RTA_PROTOINFO-1])
218 memcpy(&new_r->r_fwmark, RTA_DATA(rta[RTA_PROTOINFO-1]), 4);
219#endif
220 new_r->r_action = rtm->rtm_type;
221 new_r->r_flags = rtm->rtm_flags;
222 if (rta[RTA_PRIORITY-1])
223 memcpy(&new_r->r_preference, RTA_DATA(rta[RTA_PRIORITY-1]), 4);
224 new_r->r_table = table_id;
225 if (rta[RTA_IIF-1]) {
226 struct net_device *dev;
227 rtattr_strlcpy(new_r->r_ifname, rta[RTA_IIF-1], IFNAMSIZ);
228 new_r->r_ifindex = -1;
229 dev = __dev_get_by_name(new_r->r_ifname);
230 if (dev)
231 new_r->r_ifindex = dev->ifindex;
232 }
233#ifdef CONFIG_NET_CLS_ROUTE
234 if (rta[RTA_FLOW-1])
235 memcpy(&new_r->r_tclassid, RTA_DATA(rta[RTA_FLOW-1]), 4);
236#endif
237 r = container_of(fib_rules.first, struct fib_rule, hlist);
238 155
239 if (!new_r->r_preference) { 156 if (((saddr ^ r->src) & r->srcmask) ||
240 if (r && r->hlist.next != NULL) { 157 ((daddr ^ r->dst) & r->dstmask))
241 r = container_of(r->hlist.next, struct fib_rule, hlist); 158 return 0;
242 if (r->r_preference)
243 new_r->r_preference = r->r_preference - 1;
244 }
245 }
246 159
247 hlist_for_each_entry(r, node, &fib_rules, hlist) { 160 if (r->tos && (r->tos != fl->fl4_tos))
248 if (r->r_preference > new_r->r_preference) 161 return 0;
249 break;
250 last = r;
251 }
252 atomic_inc(&new_r->r_clntref);
253 162
254 if (last) 163#ifdef CONFIG_IP_ROUTE_FWMARK
255 hlist_add_after_rcu(&last->hlist, &new_r->hlist); 164 if ((r->fwmark ^ fl->fl4_fwmark) & r->fwmask)
256 else 165 return 0;
257 hlist_add_before_rcu(&new_r->hlist, &r->hlist); 166#endif
258 167
259 rtmsg_rule(RTM_NEWRULE, new_r); 168 return 1;
260 return 0;
261} 169}
262 170
263#ifdef CONFIG_NET_CLS_ROUTE 171static struct fib_table *fib_empty_table(void)
264u32 fib_rules_tclass(struct fib_result *res)
265{ 172{
266 if (res->r) 173 u32 id;
267 return res->r->r_tclassid; 174
268 return 0; 175 for (id = 1; id <= RT_TABLE_MAX; id++)
176 if (fib_get_table(id) == NULL)
177 return fib_new_table(id);
178 return NULL;
269} 179}
270#endif
271 180
272/* callers should hold rtnl semaphore */ 181static struct nla_policy fib4_rule_policy[FRA_MAX+1] __read_mostly = {
182 [FRA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
183 [FRA_PRIORITY] = { .type = NLA_U32 },
184 [FRA_SRC] = { .type = NLA_U32 },
185 [FRA_DST] = { .type = NLA_U32 },
186 [FRA_FWMARK] = { .type = NLA_U32 },
187 [FRA_FWMASK] = { .type = NLA_U32 },
188 [FRA_FLOW] = { .type = NLA_U32 },
189 [FRA_TABLE] = { .type = NLA_U32 },
190};
273 191
274static void fib_rules_detach(struct net_device *dev) 192static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
193 struct nlmsghdr *nlh, struct fib_rule_hdr *frh,
194 struct nlattr **tb)
275{ 195{
276 struct hlist_node *node; 196 int err = -EINVAL;
277 struct fib_rule *r; 197 struct fib4_rule *rule4 = (struct fib4_rule *) rule;
198
199 if (frh->src_len > 32 || frh->dst_len > 32 ||
200 (frh->tos & ~IPTOS_TOS_MASK))
201 goto errout;
202
203 if (rule->table == RT_TABLE_UNSPEC) {
204 if (rule->action == FR_ACT_TO_TBL) {
205 struct fib_table *table;
278 206
279 hlist_for_each_entry(r, node, &fib_rules, hlist) { 207 table = fib_empty_table();
280 if (r->r_ifindex == dev->ifindex) 208 if (table == NULL) {
281 r->r_ifindex = -1; 209 err = -ENOBUFS;
210 goto errout;
211 }
282 212
213 rule->table = table->tb_id;
214 }
283 } 215 }
284}
285 216
286/* callers should hold rtnl semaphore */ 217 if (tb[FRA_SRC])
218 rule4->src = nla_get_be32(tb[FRA_SRC]);
287 219
288static void fib_rules_attach(struct net_device *dev) 220 if (tb[FRA_DST])
289{ 221 rule4->dst = nla_get_be32(tb[FRA_DST]);
290 struct hlist_node *node;
291 struct fib_rule *r;
292 222
293 hlist_for_each_entry(r, node, &fib_rules, hlist) { 223#ifdef CONFIG_IP_ROUTE_FWMARK
294 if (r->r_ifindex == -1 && strcmp(dev->name, r->r_ifname) == 0) 224 if (tb[FRA_FWMARK]) {
295 r->r_ifindex = dev->ifindex; 225 rule4->fwmark = nla_get_u32(tb[FRA_FWMARK]);
226 if (rule4->fwmark)
227 /* compatibility: if the mark value is non-zero all bits
228 * are compared unless a mask is explicitly specified.
229 */
230 rule4->fwmask = 0xFFFFFFFF;
296 } 231 }
232
233 if (tb[FRA_FWMASK])
234 rule4->fwmask = nla_get_u32(tb[FRA_FWMASK]);
235#endif
236
237#ifdef CONFIG_NET_CLS_ROUTE
238 if (tb[FRA_FLOW])
239 rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
240#endif
241
242 rule4->src_len = frh->src_len;
243 rule4->srcmask = inet_make_mask(rule4->src_len);
244 rule4->dst_len = frh->dst_len;
245 rule4->dstmask = inet_make_mask(rule4->dst_len);
246 rule4->tos = frh->tos;
247
248 err = 0;
249errout:
250 return err;
297} 251}
298 252
299int fib_lookup(const struct flowi *flp, struct fib_result *res) 253static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
254 struct nlattr **tb)
300{ 255{
301 int err; 256 struct fib4_rule *rule4 = (struct fib4_rule *) rule;
302 struct fib_rule *r, *policy;
303 struct fib_table *tb;
304 struct hlist_node *node;
305 257
306 u32 daddr = flp->fl4_dst; 258 if (frh->src_len && (rule4->src_len != frh->src_len))
307 u32 saddr = flp->fl4_src; 259 return 0;
308 260
309FRprintk("Lookup: %u.%u.%u.%u <- %u.%u.%u.%u ", 261 if (frh->dst_len && (rule4->dst_len != frh->dst_len))
310 NIPQUAD(flp->fl4_dst), NIPQUAD(flp->fl4_src)); 262 return 0;
311 263
312 rcu_read_lock(); 264 if (frh->tos && (rule4->tos != frh->tos))
265 return 0;
313 266
314 hlist_for_each_entry_rcu(r, node, &fib_rules, hlist) {
315 if (((saddr^r->r_src) & r->r_srcmask) ||
316 ((daddr^r->r_dst) & r->r_dstmask) ||
317 (r->r_tos && r->r_tos != flp->fl4_tos) ||
318#ifdef CONFIG_IP_ROUTE_FWMARK 267#ifdef CONFIG_IP_ROUTE_FWMARK
319 (r->r_fwmark && r->r_fwmark != flp->fl4_fwmark) || 268 if (tb[FRA_FWMARK] && (rule4->fwmark != nla_get_u32(tb[FRA_FWMARK])))
269 return 0;
270
271 if (tb[FRA_FWMASK] && (rule4->fwmask != nla_get_u32(tb[FRA_FWMASK])))
272 return 0;
320#endif 273#endif
321 (r->r_ifindex && r->r_ifindex != flp->iif))
322 continue;
323
324FRprintk("tb %d r %d ", r->r_table, r->r_action);
325 switch (r->r_action) {
326 case RTN_UNICAST:
327 policy = r;
328 break;
329 case RTN_UNREACHABLE:
330 rcu_read_unlock();
331 return -ENETUNREACH;
332 default:
333 case RTN_BLACKHOLE:
334 rcu_read_unlock();
335 return -EINVAL;
336 case RTN_PROHIBIT:
337 rcu_read_unlock();
338 return -EACCES;
339 }
340 274
341 if ((tb = fib_get_table(r->r_table)) == NULL) 275#ifdef CONFIG_NET_CLS_ROUTE
342 continue; 276 if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
343 err = tb->tb_lookup(tb, flp, res); 277 return 0;
344 if (err == 0) { 278#endif
345 res->r = policy;
346 if (policy)
347 atomic_inc(&policy->r_clntref);
348 rcu_read_unlock();
349 return 0;
350 }
351 if (err < 0 && err != -EAGAIN) {
352 rcu_read_unlock();
353 return err;
354 }
355 }
356FRprintk("FAILURE\n");
357 rcu_read_unlock();
358 return -ENETUNREACH;
359}
360 279
361void fib_select_default(const struct flowi *flp, struct fib_result *res) 280 if (tb[FRA_SRC] && (rule4->src != nla_get_be32(tb[FRA_SRC])))
362{ 281 return 0;
363 if (res->r && res->r->r_action == RTN_UNICAST &&
364 FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) {
365 struct fib_table *tb;
366 if ((tb = fib_get_table(res->r->r_table)) != NULL)
367 tb->tb_select_default(tb, flp, res);
368 }
369}
370 282
371static int fib_rules_event(struct notifier_block *this, unsigned long event, void *ptr) 283 if (tb[FRA_DST] && (rule4->dst != nla_get_be32(tb[FRA_DST])))
372{ 284 return 0;
373 struct net_device *dev = ptr;
374 285
375 if (event == NETDEV_UNREGISTER) 286 return 1;
376 fib_rules_detach(dev);
377 else if (event == NETDEV_REGISTER)
378 fib_rules_attach(dev);
379 return NOTIFY_DONE;
380} 287}
381 288
289static int fib4_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
290 struct nlmsghdr *nlh, struct fib_rule_hdr *frh)
291{
292 struct fib4_rule *rule4 = (struct fib4_rule *) rule;
382 293
383static struct notifier_block fib_rules_notifier = { 294 frh->family = AF_INET;
384 .notifier_call =fib_rules_event, 295 frh->dst_len = rule4->dst_len;
385}; 296 frh->src_len = rule4->src_len;
297 frh->tos = rule4->tos;
386 298
387static __inline__ int inet_fill_rule(struct sk_buff *skb,
388 struct fib_rule *r,
389 u32 pid, u32 seq, int event,
390 unsigned int flags)
391{
392 struct rtmsg *rtm;
393 struct nlmsghdr *nlh;
394 unsigned char *b = skb->tail;
395
396 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*rtm), flags);
397 rtm = NLMSG_DATA(nlh);
398 rtm->rtm_family = AF_INET;
399 rtm->rtm_dst_len = r->r_dst_len;
400 rtm->rtm_src_len = r->r_src_len;
401 rtm->rtm_tos = r->r_tos;
402#ifdef CONFIG_IP_ROUTE_FWMARK 299#ifdef CONFIG_IP_ROUTE_FWMARK
403 if (r->r_fwmark) 300 if (rule4->fwmark)
404 RTA_PUT(skb, RTA_PROTOINFO, 4, &r->r_fwmark); 301 NLA_PUT_U32(skb, FRA_FWMARK, rule4->fwmark);
302
303 if (rule4->fwmask || rule4->fwmark)
304 NLA_PUT_U32(skb, FRA_FWMASK, rule4->fwmask);
405#endif 305#endif
406 rtm->rtm_table = r->r_table; 306
407 rtm->rtm_protocol = 0; 307 if (rule4->dst_len)
408 rtm->rtm_scope = 0; 308 NLA_PUT_BE32(skb, FRA_DST, rule4->dst);
409 rtm->rtm_type = r->r_action; 309
410 rtm->rtm_flags = r->r_flags; 310 if (rule4->src_len)
411 311 NLA_PUT_BE32(skb, FRA_SRC, rule4->src);
412 if (r->r_dst_len) 312
413 RTA_PUT(skb, RTA_DST, 4, &r->r_dst);
414 if (r->r_src_len)
415 RTA_PUT(skb, RTA_SRC, 4, &r->r_src);
416 if (r->r_ifname[0])
417 RTA_PUT(skb, RTA_IIF, IFNAMSIZ, &r->r_ifname);
418 if (r->r_preference)
419 RTA_PUT(skb, RTA_PRIORITY, 4, &r->r_preference);
420 if (r->r_srcmap)
421 RTA_PUT(skb, RTA_GATEWAY, 4, &r->r_srcmap);
422#ifdef CONFIG_NET_CLS_ROUTE 313#ifdef CONFIG_NET_CLS_ROUTE
423 if (r->r_tclassid) 314 if (rule4->tclassid)
424 RTA_PUT(skb, RTA_FLOW, 4, &r->r_tclassid); 315 NLA_PUT_U32(skb, FRA_FLOW, rule4->tclassid);
425#endif 316#endif
426 nlh->nlmsg_len = skb->tail - b; 317 return 0;
427 return skb->len;
428 318
429nlmsg_failure: 319nla_put_failure:
430rtattr_failure: 320 return -ENOBUFS;
431 skb_trim(skb, b - skb->data);
432 return -1;
433} 321}
434 322
435/* callers should hold rtnl semaphore */ 323int fib4_rules_dump(struct sk_buff *skb, struct netlink_callback *cb)
436
437static void rtmsg_rule(int event, struct fib_rule *r)
438{ 324{
439 int size = NLMSG_SPACE(sizeof(struct rtmsg) + 128); 325 return fib_rules_dump(skb, cb, AF_INET);
440 struct sk_buff *skb = alloc_skb(size, GFP_KERNEL);
441
442 if (!skb)
443 netlink_set_err(rtnl, 0, RTNLGRP_IPV4_RULE, ENOBUFS);
444 else if (inet_fill_rule(skb, r, 0, 0, event, 0) < 0) {
445 kfree_skb(skb);
446 netlink_set_err(rtnl, 0, RTNLGRP_IPV4_RULE, EINVAL);
447 } else {
448 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV4_RULE, GFP_KERNEL);
449 }
450} 326}
451 327
452int inet_dump_rules(struct sk_buff *skb, struct netlink_callback *cb) 328static u32 fib4_rule_default_pref(void)
453{ 329{
454 int idx = 0; 330 struct list_head *pos;
455 int s_idx = cb->args[0]; 331 struct fib_rule *rule;
456 struct fib_rule *r; 332
457 struct hlist_node *node; 333 if (!list_empty(&fib4_rules)) {
458 334 pos = fib4_rules.next;
459 rcu_read_lock(); 335 if (pos->next != &fib4_rules) {
460 hlist_for_each_entry(r, node, &fib_rules, hlist) { 336 rule = list_entry(pos->next, struct fib_rule, list);
461 337 if (rule->pref)
462 if (idx < s_idx) 338 return rule->pref - 1;
463 continue; 339 }
464 if (inet_fill_rule(skb, r, NETLINK_CB(cb->skb).pid,
465 cb->nlh->nlmsg_seq,
466 RTM_NEWRULE, NLM_F_MULTI) < 0)
467 break;
468 idx++;
469 } 340 }
470 rcu_read_unlock();
471 cb->args[0] = idx;
472 341
473 return skb->len; 342 return 0;
474} 343}
475 344
476void __init fib_rules_init(void) 345static struct fib_rules_ops fib4_rules_ops = {
346 .family = AF_INET,
347 .rule_size = sizeof(struct fib4_rule),
348 .action = fib4_rule_action,
349 .match = fib4_rule_match,
350 .configure = fib4_rule_configure,
351 .compare = fib4_rule_compare,
352 .fill = fib4_rule_fill,
353 .default_pref = fib4_rule_default_pref,
354 .nlgroup = RTNLGRP_IPV4_RULE,
355 .policy = fib4_rule_policy,
356 .rules_list = &fib4_rules,
357 .owner = THIS_MODULE,
358};
359
360void __init fib4_rules_init(void)
477{ 361{
478 INIT_HLIST_HEAD(&fib_rules); 362 list_add_tail(&local_rule.common.list, &fib4_rules);
479 hlist_add_head(&local_rule.hlist, &fib_rules); 363 list_add_tail(&main_rule.common.list, &fib4_rules);
480 hlist_add_after(&local_rule.hlist, &main_rule.hlist); 364 list_add_tail(&default_rule.common.list, &fib4_rules);
481 hlist_add_after(&main_rule.hlist, &default_rule.hlist); 365
482 register_netdevice_notifier(&fib_rules_notifier); 366 fib_rules_register(&fib4_rules_ops);
483} 367}
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-07 21:28:51 -0500