| /* |
| * net/sched/cls_route.c ROUTE4 classifier. |
| * |
| * 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. |
| * |
| * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/string.h> |
| #include <linux/errno.h> |
| #include <linux/skbuff.h> |
| #include <net/dst.h> |
| #include <net/route.h> |
| #include <net/netlink.h> |
| #include <net/act_api.h> |
| #include <net/pkt_cls.h> |
| |
| /* |
| * 1. For now we assume that route tags < 256. |
| * It allows to use direct table lookups, instead of hash tables. |
| * 2. For now we assume that "from TAG" and "fromdev DEV" statements |
| * are mutually exclusive. |
| * 3. "to TAG from ANY" has higher priority, than "to ANY from XXX" |
| */ |
| |
| struct route4_fastmap { |
| struct route4_filter *filter; |
| u32 id; |
| int iif; |
| }; |
| |
| struct route4_head { |
| struct route4_fastmap fastmap[16]; |
| struct route4_bucket *table[256 + 1]; |
| }; |
| |
| struct route4_bucket { |
| /* 16 FROM buckets + 16 IIF buckets + 1 wildcard bucket */ |
| struct route4_filter *ht[16 + 16 + 1]; |
| }; |
| |
| struct route4_filter { |
| struct route4_filter *next; |
| u32 id; |
| int iif; |
| |
| struct tcf_result res; |
| struct tcf_exts exts; |
| u32 handle; |
| struct route4_bucket *bkt; |
| }; |
| |
| #define ROUTE4_FAILURE ((struct route4_filter *)(-1L)) |
| |
| static const struct tcf_ext_map route_ext_map = { |
| .police = TCA_ROUTE4_POLICE, |
| .action = TCA_ROUTE4_ACT |
| }; |
| |
| static inline int route4_fastmap_hash(u32 id, int iif) |
| { |
| return id & 0xF; |
| } |
| |
| static void |
| route4_reset_fastmap(struct Qdisc *q, struct route4_head *head, u32 id) |
| { |
| spinlock_t *root_lock = qdisc_root_sleeping_lock(q); |
| |
| spin_lock_bh(root_lock); |
| memset(head->fastmap, 0, sizeof(head->fastmap)); |
| spin_unlock_bh(root_lock); |
| } |
| |
| static void |
| route4_set_fastmap(struct route4_head *head, u32 id, int iif, |
| struct route4_filter *f) |
| { |
| int h = route4_fastmap_hash(id, iif); |
| |
| head->fastmap[h].id = id; |
| head->fastmap[h].iif = iif; |
| head->fastmap[h].filter = f; |
| } |
| |
| static inline int route4_hash_to(u32 id) |
| { |
| return id & 0xFF; |
| } |
| |
| static inline int route4_hash_from(u32 id) |
| { |
| return (id >> 16) & 0xF; |
| } |
| |
| static inline int route4_hash_iif(int iif) |
| { |
| return 16 + ((iif >> 16) & 0xF); |
| } |
| |
| static inline int route4_hash_wild(void) |
| { |
| return 32; |
| } |
| |
| #define ROUTE4_APPLY_RESULT() \ |
| { \ |
| *res = f->res; \ |
| if (tcf_exts_is_available(&f->exts)) { \ |
| int r = tcf_exts_exec(skb, &f->exts, res); \ |
| if (r < 0) { \ |
| dont_cache = 1; \ |
| continue; \ |
| } \ |
| return r; \ |
| } else if (!dont_cache) \ |
| route4_set_fastmap(head, id, iif, f); \ |
| return 0; \ |
| } |
| |
| static int route4_classify(struct sk_buff *skb, struct tcf_proto *tp, |
| struct tcf_result *res) |
| { |
| struct route4_head *head = (struct route4_head *)tp->root; |
| struct dst_entry *dst; |
| struct route4_bucket *b; |
| struct route4_filter *f; |
| u32 id, h; |
| int iif, dont_cache = 0; |
| |
| dst = skb_dst(skb); |
| if (!dst) |
| goto failure; |
| |
| id = dst->tclassid; |
| if (head == NULL) |
| goto old_method; |
| |
| iif = ((struct rtable *)dst)->fl.iif; |
| |
| h = route4_fastmap_hash(id, iif); |
| if (id == head->fastmap[h].id && |
| iif == head->fastmap[h].iif && |
| (f = head->fastmap[h].filter) != NULL) { |
| if (f == ROUTE4_FAILURE) |
| goto failure; |
| |
| *res = f->res; |
| return 0; |
| } |
| |
| h = route4_hash_to(id); |
| |
| restart: |
| b = head->table[h]; |
| if (b) { |
| for (f = b->ht[route4_hash_from(id)]; f; f = f->next) |
| if (f->id == id) |
| ROUTE4_APPLY_RESULT(); |
| |
| for (f = b->ht[route4_hash_iif(iif)]; f; f = f->next) |
| if (f->iif == iif) |
| ROUTE4_APPLY_RESULT(); |
| |
| for (f = b->ht[route4_hash_wild()]; f; f = f->next) |
| ROUTE4_APPLY_RESULT(); |
| |
| } |
| if (h < 256) { |
| h = 256; |
| id &= ~0xFFFF; |
| goto restart; |
| } |
| |
| if (!dont_cache) |
| route4_set_fastmap(head, id, iif, ROUTE4_FAILURE); |
| failure: |
| return -1; |
| |
| old_method: |
| if (id && (TC_H_MAJ(id) == 0 || |
| !(TC_H_MAJ(id^tp->q->handle)))) { |
| res->classid = id; |
| res->class = 0; |
| return 0; |
| } |
| return -1; |
| } |
| |
| static inline u32 to_hash(u32 id) |
| { |
| u32 h = id & 0xFF; |
| |
| if (id & 0x8000) |
| h += 256; |
| return h; |
| } |
| |
| static inline u32 from_hash(u32 id) |
| { |
| id &= 0xFFFF; |
| if (id == 0xFFFF) |
| return 32; |
| if (!(id & 0x8000)) { |
| if (id > 255) |
| return 256; |
| return id & 0xF; |
| } |
| return 16 + (id & 0xF); |
| } |
| |
| static unsigned long route4_get(struct tcf_proto *tp, u32 handle) |
| { |
| struct route4_head *head = (struct route4_head *)tp->root; |
| struct route4_bucket *b; |
| struct route4_filter *f; |
| unsigned int h1, h2; |
| |
| if (!head) |
| return 0; |
| |
| h1 = to_hash(handle); |
| if (h1 > 256) |
| return 0; |
| |
| h2 = from_hash(handle >> 16); |
| if (h2 > 32) |
| return 0; |
| |
| b = head->table[h1]; |
| if (b) { |
| for (f = b->ht[h2]; f; f = f->next) |
| if (f->handle == handle) |
| return (unsigned long)f; |
| } |
| return 0; |
| } |
| |
| static void route4_put(struct tcf_proto *tp, unsigned long f) |
| { |
| } |
| |
| static int route4_init(struct tcf_proto *tp) |
| { |
| return 0; |
| } |
| |
| static void |
| route4_delete_filter(struct tcf_proto *tp, struct route4_filter *f) |
| { |
| tcf_unbind_filter(tp, &f->res); |
| tcf_exts_destroy(tp, &f->exts); |
| kfree(f); |
| } |
| |
| static void route4_destroy(struct tcf_proto *tp) |
| { |
| struct route4_head *head = tp->root; |
| int h1, h2; |
| |
| if (head == NULL) |
| return; |
| |
| for (h1 = 0; h1 <= 256; h1++) { |
| struct route4_bucket *b; |
| |
| b = head->table[h1]; |
| if (b) { |
| for (h2 = 0; h2 <= 32; h2++) { |
| struct route4_filter *f; |
| |
| while ((f = b->ht[h2]) != NULL) { |
| b->ht[h2] = f->next; |
| route4_delete_filter(tp, f); |
| } |
| } |
| kfree(b); |
| } |
| } |
| kfree(head); |
| } |
| |
| static int route4_delete(struct tcf_proto *tp, unsigned long arg) |
| { |
| struct route4_head *head = (struct route4_head *)tp->root; |
| struct route4_filter **fp, *f = (struct route4_filter *)arg; |
| unsigned int h = 0; |
| struct route4_bucket *b; |
| int i; |
| |
| if (!head || !f) |
| return -EINVAL; |
| |
| h = f->handle; |
| b = f->bkt; |
| |
| for (fp = &b->ht[from_hash(h >> 16)]; *fp; fp = &(*fp)->next) { |
| if (*fp == f) { |
| tcf_tree_lock(tp); |
| *fp = f->next; |
| tcf_tree_unlock(tp); |
| |
| route4_reset_fastmap(tp->q, head, f->id); |
| route4_delete_filter(tp, f); |
| |
| /* Strip tree */ |
| |
| for (i = 0; i <= 32; i++) |
| if (b->ht[i]) |
| return 0; |
| |
| /* OK, session has no flows */ |
| tcf_tree_lock(tp); |
| head->table[to_hash(h)] = NULL; |
| tcf_tree_unlock(tp); |
| |
| kfree(b); |
| return 0; |
| } |
| } |
| return 0; |
| } |
| |
| static const struct nla_policy route4_policy[TCA_ROUTE4_MAX + 1] = { |
| [TCA_ROUTE4_CLASSID] = { .type = NLA_U32 }, |
| [TCA_ROUTE4_TO] = { .type = NLA_U32 }, |
| [TCA_ROUTE4_FROM] = { .type = NLA_U32 }, |
| [TCA_ROUTE4_IIF] = { .type = NLA_U32 }, |
| }; |
| |
| static int route4_set_parms(struct tcf_proto *tp, unsigned long base, |
| struct route4_filter *f, u32 handle, struct route4_head *head, |
| struct nlattr **tb, struct nlattr *est, int new) |
| { |
| int err; |
| u32 id = 0, to = 0, nhandle = 0x8000; |
| struct route4_filter *fp; |
| unsigned int h1; |
| struct route4_bucket *b; |
| struct tcf_exts e; |
| |
| err = tcf_exts_validate(tp, tb, est, &e, &route_ext_map); |
| if (err < 0) |
| return err; |
| |
| err = -EINVAL; |
| if (tb[TCA_ROUTE4_TO]) { |
| if (new && handle & 0x8000) |
| goto errout; |
| to = nla_get_u32(tb[TCA_ROUTE4_TO]); |
| if (to > 0xFF) |
| goto errout; |
| nhandle = to; |
| } |
| |
| if (tb[TCA_ROUTE4_FROM]) { |
| if (tb[TCA_ROUTE4_IIF]) |
| goto errout; |
| id = nla_get_u32(tb[TCA_ROUTE4_FROM]); |
| if (id > 0xFF) |
| goto errout; |
| nhandle |= id << 16; |
| } else if (tb[TCA_ROUTE4_IIF]) { |
| id = nla_get_u32(tb[TCA_ROUTE4_IIF]); |
| if (id > 0x7FFF) |
| goto errout; |
| nhandle |= (id | 0x8000) << 16; |
| } else |
| nhandle |= 0xFFFF << 16; |
| |
| if (handle && new) { |
| nhandle |= handle & 0x7F00; |
| if (nhandle != handle) |
| goto errout; |
| } |
| |
| h1 = to_hash(nhandle); |
| b = head->table[h1]; |
| if (!b) { |
| err = -ENOBUFS; |
| b = kzalloc(sizeof(struct route4_bucket), GFP_KERNEL); |
| if (b == NULL) |
| goto errout; |
| |
| tcf_tree_lock(tp); |
| head->table[h1] = b; |
| tcf_tree_unlock(tp); |
| } else { |
| unsigned int h2 = from_hash(nhandle >> 16); |
| |
| err = -EEXIST; |
| for (fp = b->ht[h2]; fp; fp = fp->next) |
| if (fp->handle == f->handle) |
| goto errout; |
| } |
| |
| tcf_tree_lock(tp); |
| if (tb[TCA_ROUTE4_TO]) |
| f->id = to; |
| |
| if (tb[TCA_ROUTE4_FROM]) |
| f->id = to | id<<16; |
| else if (tb[TCA_ROUTE4_IIF]) |
| f->iif = id; |
| |
| f->handle = nhandle; |
| f->bkt = b; |
| tcf_tree_unlock(tp); |
| |
| if (tb[TCA_ROUTE4_CLASSID]) { |
| f->res.classid = nla_get_u32(tb[TCA_ROUTE4_CLASSID]); |
| tcf_bind_filter(tp, &f->res, base); |
| } |
| |
| tcf_exts_change(tp, &f->exts, &e); |
| |
| return 0; |
| errout: |
| tcf_exts_destroy(tp, &e); |
| return err; |
| } |
| |
| static int route4_change(struct tcf_proto *tp, unsigned long base, |
| u32 handle, |
| struct nlattr **tca, |
| unsigned long *arg) |
| { |
| struct route4_head *head = tp->root; |
| struct route4_filter *f, *f1, **fp; |
| struct route4_bucket *b; |
| struct nlattr *opt = tca[TCA_OPTIONS]; |
| struct nlattr *tb[TCA_ROUTE4_MAX + 1]; |
| unsigned int h, th; |
| u32 old_handle = 0; |
| int err; |
| |
| if (opt == NULL) |
| return handle ? -EINVAL : 0; |
| |
| err = nla_parse_nested(tb, TCA_ROUTE4_MAX, opt, route4_policy); |
| if (err < 0) |
| return err; |
| |
| f = (struct route4_filter *)*arg; |
| if (f) { |
| if (f->handle != handle && handle) |
| return -EINVAL; |
| |
| if (f->bkt) |
| old_handle = f->handle; |
| |
| err = route4_set_parms(tp, base, f, handle, head, tb, |
| tca[TCA_RATE], 0); |
| if (err < 0) |
| return err; |
| |
| goto reinsert; |
| } |
| |
| err = -ENOBUFS; |
| if (head == NULL) { |
| head = kzalloc(sizeof(struct route4_head), GFP_KERNEL); |
| if (head == NULL) |
| goto errout; |
| |
| tcf_tree_lock(tp); |
| tp->root = head; |
| tcf_tree_unlock(tp); |
| } |
| |
| f = kzalloc(sizeof(struct route4_filter), GFP_KERNEL); |
| if (f == NULL) |
| goto errout; |
| |
| err = route4_set_parms(tp, base, f, handle, head, tb, |
| tca[TCA_RATE], 1); |
| if (err < 0) |
| goto errout; |
| |
| reinsert: |
| h = from_hash(f->handle >> 16); |
| for (fp = &f->bkt->ht[h]; (f1 = *fp) != NULL; fp = &f1->next) |
| if (f->handle < f1->handle) |
| break; |
| |
| f->next = f1; |
| tcf_tree_lock(tp); |
| *fp = f; |
| |
| if (old_handle && f->handle != old_handle) { |
| th = to_hash(old_handle); |
| h = from_hash(old_handle >> 16); |
| b = head->table[th]; |
| if (b) { |
| for (fp = &b->ht[h]; *fp; fp = &(*fp)->next) { |
| if (*fp == f) { |
| *fp = f->next; |
| break; |
| } |
| } |
| } |
| } |
| tcf_tree_unlock(tp); |
| |
| route4_reset_fastmap(tp->q, head, f->id); |
| *arg = (unsigned long)f; |
| return 0; |
| |
| errout: |
| kfree(f); |
| return err; |
| } |
| |
| static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg) |
| { |
| struct route4_head *head = tp->root; |
| unsigned int h, h1; |
| |
| if (head == NULL) |
| arg->stop = 1; |
| |
| if (arg->stop) |
| return; |
| |
| for (h = 0; h <= 256; h++) { |
| struct route4_bucket *b = head->table[h]; |
| |
| if (b) { |
| for (h1 = 0; h1 <= 32; h1++) { |
| struct route4_filter *f; |
| |
| for (f = b->ht[h1]; f; f = f->next) { |
| if (arg->count < arg->skip) { |
| arg->count++; |
| continue; |
| } |
| if (arg->fn(tp, (unsigned long)f, arg) < 0) { |
| arg->stop = 1; |
| return; |
| } |
| arg->count++; |
| } |
| } |
| } |
| } |
| } |
| |
| static int route4_dump(struct tcf_proto *tp, unsigned long fh, |
| struct sk_buff *skb, struct tcmsg *t) |
| { |
| struct route4_filter *f = (struct route4_filter *)fh; |
| unsigned char *b = skb_tail_pointer(skb); |
| struct nlattr *nest; |
| u32 id; |
| |
| if (f == NULL) |
| return skb->len; |
| |
| t->tcm_handle = f->handle; |
| |
| nest = nla_nest_start(skb, TCA_OPTIONS); |
| if (nest == NULL) |
| goto nla_put_failure; |
| |
| if (!(f->handle & 0x8000)) { |
| id = f->id & 0xFF; |
| NLA_PUT_U32(skb, TCA_ROUTE4_TO, id); |
| } |
| if (f->handle & 0x80000000) { |
| if ((f->handle >> 16) != 0xFFFF) |
| NLA_PUT_U32(skb, TCA_ROUTE4_IIF, f->iif); |
| } else { |
| id = f->id >> 16; |
| NLA_PUT_U32(skb, TCA_ROUTE4_FROM, id); |
| } |
| if (f->res.classid) |
| NLA_PUT_U32(skb, TCA_ROUTE4_CLASSID, f->res.classid); |
| |
| if (tcf_exts_dump(skb, &f->exts, &route_ext_map) < 0) |
| goto nla_put_failure; |
| |
| nla_nest_end(skb, nest); |
| |
| if (tcf_exts_dump_stats(skb, &f->exts, &route_ext_map) < 0) |
| goto nla_put_failure; |
| |
| return skb->len; |
| |
| nla_put_failure: |
| nlmsg_trim(skb, b); |
| return -1; |
| } |
| |
| static struct tcf_proto_ops cls_route4_ops __read_mostly = { |
| .kind = "route", |
| .classify = route4_classify, |
| .init = route4_init, |
| .destroy = route4_destroy, |
| .get = route4_get, |
| .put = route4_put, |
| .change = route4_change, |
| .delete = route4_delete, |
| .walk = route4_walk, |
| .dump = route4_dump, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int __init init_route4(void) |
| { |
| return register_tcf_proto_ops(&cls_route4_ops); |
| } |
| |
| static void __exit exit_route4(void) |
| { |
| unregister_tcf_proto_ops(&cls_route4_ops); |
| } |
| |
| module_init(init_route4) |
| module_exit(exit_route4) |
| MODULE_LICENSE("GPL"); |