![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
640 lines
13 KiB
C
640 lines
13 KiB
C
/*
|
|
* 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/config.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/system.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/sockios.h>
|
|
#include <linux/in.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/if_ether.h>
|
|
#include <linux/inet.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/notifier.h>
|
|
#include <net/ip.h>
|
|
#include <net/route.h>
|
|
#include <linux/skbuff.h>
|
|
#include <net/sock.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 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 inline
|
|
void route4_reset_fastmap(struct net_device *dev, struct route4_head *head, u32 id)
|
|
{
|
|
spin_lock_bh(&dev->queue_lock);
|
|
memset(head->fastmap, 0, sizeof(head->fastmap));
|
|
spin_unlock_bh(&dev->queue_lock);
|
|
}
|
|
|
|
static void __inline__
|
|
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;
|
|
|
|
if ((dst = skb->dst) == NULL)
|
|
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:
|
|
if ((b = head->table[h]) != NULL) {
|
|
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 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;
|
|
|
|
if ((b = head->table[h1]) != NULL) {
|
|
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 inline 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 = xchg(&tp->root, NULL);
|
|
int h1, h2;
|
|
|
|
if (head == NULL)
|
|
return;
|
|
|
|
for (h1=0; h1<=256; h1++) {
|
|
struct route4_bucket *b;
|
|
|
|
if ((b = head->table[h1]) != NULL) {
|
|
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 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->dev, 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 int route4_set_parms(struct tcf_proto *tp, unsigned long base,
|
|
struct route4_filter *f, u32 handle, struct route4_head *head,
|
|
struct rtattr **tb, struct rtattr *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_CLASSID-1])
|
|
if (RTA_PAYLOAD(tb[TCA_ROUTE4_CLASSID-1]) < sizeof(u32))
|
|
goto errout;
|
|
|
|
if (tb[TCA_ROUTE4_TO-1]) {
|
|
if (new && handle & 0x8000)
|
|
goto errout;
|
|
if (RTA_PAYLOAD(tb[TCA_ROUTE4_TO-1]) < sizeof(u32))
|
|
goto errout;
|
|
to = *(u32*)RTA_DATA(tb[TCA_ROUTE4_TO-1]);
|
|
if (to > 0xFF)
|
|
goto errout;
|
|
nhandle = to;
|
|
}
|
|
|
|
if (tb[TCA_ROUTE4_FROM-1]) {
|
|
if (tb[TCA_ROUTE4_IIF-1])
|
|
goto errout;
|
|
if (RTA_PAYLOAD(tb[TCA_ROUTE4_FROM-1]) < sizeof(u32))
|
|
goto errout;
|
|
id = *(u32*)RTA_DATA(tb[TCA_ROUTE4_FROM-1]);
|
|
if (id > 0xFF)
|
|
goto errout;
|
|
nhandle |= id << 16;
|
|
} else if (tb[TCA_ROUTE4_IIF-1]) {
|
|
if (RTA_PAYLOAD(tb[TCA_ROUTE4_IIF-1]) < sizeof(u32))
|
|
goto errout;
|
|
id = *(u32*)RTA_DATA(tb[TCA_ROUTE4_IIF-1]);
|
|
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);
|
|
if ((b = head->table[h1]) == NULL) {
|
|
err = -ENOBUFS;
|
|
b = kmalloc(sizeof(struct route4_bucket), GFP_KERNEL);
|
|
if (b == NULL)
|
|
goto errout;
|
|
memset(b, 0, sizeof(*b));
|
|
|
|
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-1])
|
|
f->id = to;
|
|
|
|
if (tb[TCA_ROUTE4_FROM-1])
|
|
f->id = to | id<<16;
|
|
else if (tb[TCA_ROUTE4_IIF-1])
|
|
f->iif = id;
|
|
|
|
f->handle = nhandle;
|
|
f->bkt = b;
|
|
tcf_tree_unlock(tp);
|
|
|
|
if (tb[TCA_ROUTE4_CLASSID-1]) {
|
|
f->res.classid = *(u32*)RTA_DATA(tb[TCA_ROUTE4_CLASSID-1]);
|
|
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 rtattr **tca,
|
|
unsigned long *arg)
|
|
{
|
|
struct route4_head *head = tp->root;
|
|
struct route4_filter *f, *f1, **fp;
|
|
struct route4_bucket *b;
|
|
struct rtattr *opt = tca[TCA_OPTIONS-1];
|
|
struct rtattr *tb[TCA_ROUTE4_MAX];
|
|
unsigned int h, th;
|
|
u32 old_handle = 0;
|
|
int err;
|
|
|
|
if (opt == NULL)
|
|
return handle ? -EINVAL : 0;
|
|
|
|
if (rtattr_parse_nested(tb, TCA_ROUTE4_MAX, opt) < 0)
|
|
return -EINVAL;
|
|
|
|
if ((f = (struct route4_filter*)*arg) != NULL) {
|
|
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-1], 0);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
goto reinsert;
|
|
}
|
|
|
|
err = -ENOBUFS;
|
|
if (head == NULL) {
|
|
head = kmalloc(sizeof(struct route4_head), GFP_KERNEL);
|
|
if (head == NULL)
|
|
goto errout;
|
|
memset(head, 0, sizeof(struct route4_head));
|
|
|
|
tcf_tree_lock(tp);
|
|
tp->root = head;
|
|
tcf_tree_unlock(tp);
|
|
}
|
|
|
|
f = kmalloc(sizeof(struct route4_filter), GFP_KERNEL);
|
|
if (f == NULL)
|
|
goto errout;
|
|
memset(f, 0, sizeof(*f));
|
|
|
|
err = route4_set_parms(tp, base, f, handle, head, tb,
|
|
tca[TCA_RATE-1], 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);
|
|
if ((b = head->table[th]) != NULL) {
|
|
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->dev, head, f->id);
|
|
*arg = (unsigned long)f;
|
|
return 0;
|
|
|
|
errout:
|
|
if (f)
|
|
kfree(f);
|
|
return err;
|
|
}
|
|
|
|
static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg)
|
|
{
|
|
struct route4_head *head = tp->root;
|
|
unsigned 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;
|
|
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");
|