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0da974f4f3
Signed-off-by: Panagiotis Issaris <takis@issaris.org> Signed-off-by: David S. Miller <davem@davemloft.net>
635 lines
13 KiB
C
635 lines
13 KiB
C
/*
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* net/sched/cls_route.c ROUTE4 classifier.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*/
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#include <linux/module.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/bitops.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/if_ether.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/notifier.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/act_api.h>
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#include <net/pkt_cls.h>
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/*
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1. For now we assume that route tags < 256.
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It allows to use direct table lookups, instead of hash tables.
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2. For now we assume that "from TAG" and "fromdev DEV" statements
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are mutually exclusive.
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3. "to TAG from ANY" has higher priority, than "to ANY from XXX"
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*/
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struct route4_fastmap
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{
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struct route4_filter *filter;
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u32 id;
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int iif;
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};
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struct route4_head
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{
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struct route4_fastmap fastmap[16];
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struct route4_bucket *table[256+1];
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};
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struct route4_bucket
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{
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/* 16 FROM buckets + 16 IIF buckets + 1 wildcard bucket */
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struct route4_filter *ht[16+16+1];
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};
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struct route4_filter
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{
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struct route4_filter *next;
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u32 id;
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int iif;
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struct tcf_result res;
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struct tcf_exts exts;
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u32 handle;
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struct route4_bucket *bkt;
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};
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#define ROUTE4_FAILURE ((struct route4_filter*)(-1L))
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static struct tcf_ext_map route_ext_map = {
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.police = TCA_ROUTE4_POLICE,
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.action = TCA_ROUTE4_ACT
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};
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static __inline__ int route4_fastmap_hash(u32 id, int iif)
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{
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return id&0xF;
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}
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static inline
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void route4_reset_fastmap(struct net_device *dev, struct route4_head *head, u32 id)
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{
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spin_lock_bh(&dev->queue_lock);
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memset(head->fastmap, 0, sizeof(head->fastmap));
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spin_unlock_bh(&dev->queue_lock);
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}
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static void __inline__
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route4_set_fastmap(struct route4_head *head, u32 id, int iif,
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struct route4_filter *f)
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{
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int h = route4_fastmap_hash(id, iif);
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head->fastmap[h].id = id;
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head->fastmap[h].iif = iif;
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head->fastmap[h].filter = f;
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}
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static __inline__ int route4_hash_to(u32 id)
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{
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return id&0xFF;
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}
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static __inline__ int route4_hash_from(u32 id)
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{
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return (id>>16)&0xF;
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}
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static __inline__ int route4_hash_iif(int iif)
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{
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return 16 + ((iif>>16)&0xF);
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}
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static __inline__ int route4_hash_wild(void)
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{
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return 32;
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}
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#define ROUTE4_APPLY_RESULT() \
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{ \
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*res = f->res; \
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if (tcf_exts_is_available(&f->exts)) { \
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int r = tcf_exts_exec(skb, &f->exts, res); \
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if (r < 0) { \
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dont_cache = 1; \
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continue; \
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} \
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return r; \
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} else if (!dont_cache) \
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route4_set_fastmap(head, id, iif, f); \
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return 0; \
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}
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static int route4_classify(struct sk_buff *skb, struct tcf_proto *tp,
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struct tcf_result *res)
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{
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struct route4_head *head = (struct route4_head*)tp->root;
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struct dst_entry *dst;
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struct route4_bucket *b;
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struct route4_filter *f;
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u32 id, h;
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int iif, dont_cache = 0;
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if ((dst = skb->dst) == NULL)
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goto failure;
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id = dst->tclassid;
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if (head == NULL)
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goto old_method;
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iif = ((struct rtable*)dst)->fl.iif;
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h = route4_fastmap_hash(id, iif);
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if (id == head->fastmap[h].id &&
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iif == head->fastmap[h].iif &&
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(f = head->fastmap[h].filter) != NULL) {
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if (f == ROUTE4_FAILURE)
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goto failure;
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*res = f->res;
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return 0;
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}
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h = route4_hash_to(id);
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restart:
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if ((b = head->table[h]) != NULL) {
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for (f = b->ht[route4_hash_from(id)]; f; f = f->next)
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if (f->id == id)
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ROUTE4_APPLY_RESULT();
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for (f = b->ht[route4_hash_iif(iif)]; f; f = f->next)
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if (f->iif == iif)
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ROUTE4_APPLY_RESULT();
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for (f = b->ht[route4_hash_wild()]; f; f = f->next)
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ROUTE4_APPLY_RESULT();
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}
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if (h < 256) {
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h = 256;
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id &= ~0xFFFF;
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goto restart;
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}
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if (!dont_cache)
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route4_set_fastmap(head, id, iif, ROUTE4_FAILURE);
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failure:
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return -1;
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old_method:
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if (id && (TC_H_MAJ(id) == 0 ||
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!(TC_H_MAJ(id^tp->q->handle)))) {
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res->classid = id;
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res->class = 0;
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return 0;
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}
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return -1;
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}
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static inline u32 to_hash(u32 id)
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{
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u32 h = id&0xFF;
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if (id&0x8000)
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h += 256;
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return h;
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}
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static inline u32 from_hash(u32 id)
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{
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id &= 0xFFFF;
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if (id == 0xFFFF)
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return 32;
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if (!(id & 0x8000)) {
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if (id > 255)
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return 256;
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return id&0xF;
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}
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return 16 + (id&0xF);
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}
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static unsigned long route4_get(struct tcf_proto *tp, u32 handle)
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{
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struct route4_head *head = (struct route4_head*)tp->root;
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struct route4_bucket *b;
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struct route4_filter *f;
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unsigned h1, h2;
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if (!head)
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return 0;
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h1 = to_hash(handle);
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if (h1 > 256)
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return 0;
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h2 = from_hash(handle>>16);
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if (h2 > 32)
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return 0;
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if ((b = head->table[h1]) != NULL) {
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for (f = b->ht[h2]; f; f = f->next)
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if (f->handle == handle)
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return (unsigned long)f;
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}
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return 0;
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}
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static void route4_put(struct tcf_proto *tp, unsigned long f)
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{
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}
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static int route4_init(struct tcf_proto *tp)
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{
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return 0;
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}
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static inline void
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route4_delete_filter(struct tcf_proto *tp, struct route4_filter *f)
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{
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tcf_unbind_filter(tp, &f->res);
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tcf_exts_destroy(tp, &f->exts);
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kfree(f);
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}
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static void route4_destroy(struct tcf_proto *tp)
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{
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struct route4_head *head = xchg(&tp->root, NULL);
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int h1, h2;
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if (head == NULL)
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return;
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for (h1=0; h1<=256; h1++) {
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struct route4_bucket *b;
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if ((b = head->table[h1]) != NULL) {
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for (h2=0; h2<=32; h2++) {
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struct route4_filter *f;
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while ((f = b->ht[h2]) != NULL) {
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b->ht[h2] = f->next;
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route4_delete_filter(tp, f);
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}
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}
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kfree(b);
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}
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}
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kfree(head);
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}
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static int route4_delete(struct tcf_proto *tp, unsigned long arg)
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{
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struct route4_head *head = (struct route4_head*)tp->root;
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struct route4_filter **fp, *f = (struct route4_filter*)arg;
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unsigned h = 0;
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struct route4_bucket *b;
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int i;
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if (!head || !f)
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return -EINVAL;
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h = f->handle;
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b = f->bkt;
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for (fp = &b->ht[from_hash(h>>16)]; *fp; fp = &(*fp)->next) {
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if (*fp == f) {
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tcf_tree_lock(tp);
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*fp = f->next;
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tcf_tree_unlock(tp);
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route4_reset_fastmap(tp->q->dev, head, f->id);
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route4_delete_filter(tp, f);
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/* Strip tree */
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for (i=0; i<=32; i++)
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if (b->ht[i])
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return 0;
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/* OK, session has no flows */
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tcf_tree_lock(tp);
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head->table[to_hash(h)] = NULL;
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tcf_tree_unlock(tp);
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kfree(b);
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return 0;
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}
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}
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return 0;
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}
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static int route4_set_parms(struct tcf_proto *tp, unsigned long base,
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struct route4_filter *f, u32 handle, struct route4_head *head,
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struct rtattr **tb, struct rtattr *est, int new)
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{
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int err;
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u32 id = 0, to = 0, nhandle = 0x8000;
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struct route4_filter *fp;
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unsigned int h1;
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struct route4_bucket *b;
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struct tcf_exts e;
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err = tcf_exts_validate(tp, tb, est, &e, &route_ext_map);
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if (err < 0)
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return err;
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err = -EINVAL;
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if (tb[TCA_ROUTE4_CLASSID-1])
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if (RTA_PAYLOAD(tb[TCA_ROUTE4_CLASSID-1]) < sizeof(u32))
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goto errout;
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if (tb[TCA_ROUTE4_TO-1]) {
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if (new && handle & 0x8000)
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goto errout;
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if (RTA_PAYLOAD(tb[TCA_ROUTE4_TO-1]) < sizeof(u32))
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goto errout;
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to = *(u32*)RTA_DATA(tb[TCA_ROUTE4_TO-1]);
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if (to > 0xFF)
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goto errout;
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nhandle = to;
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}
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if (tb[TCA_ROUTE4_FROM-1]) {
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if (tb[TCA_ROUTE4_IIF-1])
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goto errout;
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if (RTA_PAYLOAD(tb[TCA_ROUTE4_FROM-1]) < sizeof(u32))
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goto errout;
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id = *(u32*)RTA_DATA(tb[TCA_ROUTE4_FROM-1]);
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if (id > 0xFF)
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goto errout;
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nhandle |= id << 16;
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} else if (tb[TCA_ROUTE4_IIF-1]) {
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if (RTA_PAYLOAD(tb[TCA_ROUTE4_IIF-1]) < sizeof(u32))
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goto errout;
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id = *(u32*)RTA_DATA(tb[TCA_ROUTE4_IIF-1]);
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if (id > 0x7FFF)
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goto errout;
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nhandle |= (id | 0x8000) << 16;
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} else
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nhandle |= 0xFFFF << 16;
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if (handle && new) {
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nhandle |= handle & 0x7F00;
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if (nhandle != handle)
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goto errout;
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}
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h1 = to_hash(nhandle);
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if ((b = head->table[h1]) == NULL) {
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err = -ENOBUFS;
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b = kzalloc(sizeof(struct route4_bucket), GFP_KERNEL);
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if (b == NULL)
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goto errout;
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tcf_tree_lock(tp);
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head->table[h1] = b;
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tcf_tree_unlock(tp);
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} else {
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unsigned int h2 = from_hash(nhandle >> 16);
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err = -EEXIST;
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for (fp = b->ht[h2]; fp; fp = fp->next)
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if (fp->handle == f->handle)
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goto errout;
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}
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tcf_tree_lock(tp);
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if (tb[TCA_ROUTE4_TO-1])
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f->id = to;
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if (tb[TCA_ROUTE4_FROM-1])
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f->id = to | id<<16;
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else if (tb[TCA_ROUTE4_IIF-1])
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f->iif = id;
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f->handle = nhandle;
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f->bkt = b;
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tcf_tree_unlock(tp);
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if (tb[TCA_ROUTE4_CLASSID-1]) {
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f->res.classid = *(u32*)RTA_DATA(tb[TCA_ROUTE4_CLASSID-1]);
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tcf_bind_filter(tp, &f->res, base);
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}
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tcf_exts_change(tp, &f->exts, &e);
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return 0;
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errout:
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tcf_exts_destroy(tp, &e);
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return err;
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}
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static int route4_change(struct tcf_proto *tp, unsigned long base,
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u32 handle,
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struct rtattr **tca,
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unsigned long *arg)
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{
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struct route4_head *head = tp->root;
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struct route4_filter *f, *f1, **fp;
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struct route4_bucket *b;
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struct rtattr *opt = tca[TCA_OPTIONS-1];
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struct rtattr *tb[TCA_ROUTE4_MAX];
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unsigned int h, th;
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u32 old_handle = 0;
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int err;
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if (opt == NULL)
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return handle ? -EINVAL : 0;
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if (rtattr_parse_nested(tb, TCA_ROUTE4_MAX, opt) < 0)
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return -EINVAL;
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if ((f = (struct route4_filter*)*arg) != NULL) {
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if (f->handle != handle && handle)
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return -EINVAL;
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if (f->bkt)
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old_handle = f->handle;
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err = route4_set_parms(tp, base, f, handle, head, tb,
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tca[TCA_RATE-1], 0);
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if (err < 0)
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return err;
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goto reinsert;
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}
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err = -ENOBUFS;
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if (head == NULL) {
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head = kzalloc(sizeof(struct route4_head), GFP_KERNEL);
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if (head == NULL)
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goto errout;
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tcf_tree_lock(tp);
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tp->root = head;
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tcf_tree_unlock(tp);
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}
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f = kzalloc(sizeof(struct route4_filter), GFP_KERNEL);
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if (f == NULL)
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goto errout;
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err = route4_set_parms(tp, base, f, handle, head, tb,
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tca[TCA_RATE-1], 1);
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if (err < 0)
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goto errout;
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reinsert:
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h = from_hash(f->handle >> 16);
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for (fp = &f->bkt->ht[h]; (f1=*fp) != NULL; fp = &f1->next)
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if (f->handle < f1->handle)
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break;
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f->next = f1;
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tcf_tree_lock(tp);
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*fp = f;
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if (old_handle && f->handle != old_handle) {
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th = to_hash(old_handle);
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h = from_hash(old_handle >> 16);
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if ((b = head->table[th]) != NULL) {
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for (fp = &b->ht[h]; *fp; fp = &(*fp)->next) {
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if (*fp == f) {
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*fp = f->next;
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break;
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}
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}
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}
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}
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tcf_tree_unlock(tp);
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route4_reset_fastmap(tp->q->dev, head, f->id);
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*arg = (unsigned long)f;
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return 0;
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errout:
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kfree(f);
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return err;
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}
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static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg)
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{
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struct route4_head *head = tp->root;
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unsigned h, h1;
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if (head == NULL)
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arg->stop = 1;
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if (arg->stop)
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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;
|
|
struct rtattr *rta;
|
|
u32 id;
|
|
|
|
if (f == NULL)
|
|
return skb->len;
|
|
|
|
t->tcm_handle = f->handle;
|
|
|
|
rta = (struct rtattr*)b;
|
|
RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
|
|
|
|
if (!(f->handle&0x8000)) {
|
|
id = f->id&0xFF;
|
|
RTA_PUT(skb, TCA_ROUTE4_TO, sizeof(id), &id);
|
|
}
|
|
if (f->handle&0x80000000) {
|
|
if ((f->handle>>16) != 0xFFFF)
|
|
RTA_PUT(skb, TCA_ROUTE4_IIF, sizeof(f->iif), &f->iif);
|
|
} else {
|
|
id = f->id>>16;
|
|
RTA_PUT(skb, TCA_ROUTE4_FROM, sizeof(id), &id);
|
|
}
|
|
if (f->res.classid)
|
|
RTA_PUT(skb, TCA_ROUTE4_CLASSID, 4, &f->res.classid);
|
|
|
|
if (tcf_exts_dump(skb, &f->exts, &route_ext_map) < 0)
|
|
goto rtattr_failure;
|
|
|
|
rta->rta_len = skb->tail - b;
|
|
|
|
if (tcf_exts_dump_stats(skb, &f->exts, &route_ext_map) < 0)
|
|
goto rtattr_failure;
|
|
|
|
return skb->len;
|
|
|
|
rtattr_failure:
|
|
skb_trim(skb, b - skb->data);
|
|
return -1;
|
|
}
|
|
|
|
static struct tcf_proto_ops cls_route4_ops = {
|
|
.next = NULL,
|
|
.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");
|