mirror of https://gitee.com/openkylin/linux.git
686 lines
14 KiB
C
686 lines
14 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/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 __rcu *table[256 + 1];
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
struct route4_bucket {
|
|
/* 16 FROM buckets + 16 IIF buckets + 1 wildcard bucket */
|
|
struct route4_filter __rcu *ht[16 + 16 + 1];
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
struct route4_filter {
|
|
struct route4_filter __rcu *next;
|
|
u32 id;
|
|
int iif;
|
|
|
|
struct tcf_result res;
|
|
struct tcf_exts exts;
|
|
u32 handle;
|
|
struct route4_bucket *bkt;
|
|
struct tcf_proto *tp;
|
|
union {
|
|
struct work_struct work;
|
|
struct rcu_head rcu;
|
|
};
|
|
};
|
|
|
|
#define ROUTE4_FAILURE ((struct route4_filter *)(-1L))
|
|
|
|
static inline int route4_fastmap_hash(u32 id, int iif)
|
|
{
|
|
return id & 0xF;
|
|
}
|
|
|
|
static DEFINE_SPINLOCK(fastmap_lock);
|
|
static void
|
|
route4_reset_fastmap(struct route4_head *head)
|
|
{
|
|
spin_lock_bh(&fastmap_lock);
|
|
memset(head->fastmap, 0, sizeof(head->fastmap));
|
|
spin_unlock_bh(&fastmap_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);
|
|
|
|
/* fastmap updates must look atomic to aling id, iff, filter */
|
|
spin_lock_bh(&fastmap_lock);
|
|
head->fastmap[h].id = id;
|
|
head->fastmap[h].iif = iif;
|
|
head->fastmap[h].filter = f;
|
|
spin_unlock_bh(&fastmap_lock);
|
|
}
|
|
|
|
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_has_actions(&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, const struct tcf_proto *tp,
|
|
struct tcf_result *res)
|
|
{
|
|
struct route4_head *head = rcu_dereference_bh(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;
|
|
|
|
iif = inet_iif(skb);
|
|
|
|
h = route4_fastmap_hash(id, iif);
|
|
|
|
spin_lock(&fastmap_lock);
|
|
if (id == head->fastmap[h].id &&
|
|
iif == head->fastmap[h].iif &&
|
|
(f = head->fastmap[h].filter) != NULL) {
|
|
if (f == ROUTE4_FAILURE) {
|
|
spin_unlock(&fastmap_lock);
|
|
goto failure;
|
|
}
|
|
|
|
*res = f->res;
|
|
spin_unlock(&fastmap_lock);
|
|
return 0;
|
|
}
|
|
spin_unlock(&fastmap_lock);
|
|
|
|
h = route4_hash_to(id);
|
|
|
|
restart:
|
|
b = rcu_dereference_bh(head->table[h]);
|
|
if (b) {
|
|
for (f = rcu_dereference_bh(b->ht[route4_hash_from(id)]);
|
|
f;
|
|
f = rcu_dereference_bh(f->next))
|
|
if (f->id == id)
|
|
ROUTE4_APPLY_RESULT();
|
|
|
|
for (f = rcu_dereference_bh(b->ht[route4_hash_iif(iif)]);
|
|
f;
|
|
f = rcu_dereference_bh(f->next))
|
|
if (f->iif == iif)
|
|
ROUTE4_APPLY_RESULT();
|
|
|
|
for (f = rcu_dereference_bh(b->ht[route4_hash_wild()]);
|
|
f;
|
|
f = rcu_dereference_bh(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;
|
|
}
|
|
|
|
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 void *route4_get(struct tcf_proto *tp, u32 handle)
|
|
{
|
|
struct route4_head *head = rtnl_dereference(tp->root);
|
|
struct route4_bucket *b;
|
|
struct route4_filter *f;
|
|
unsigned int h1, h2;
|
|
|
|
h1 = to_hash(handle);
|
|
if (h1 > 256)
|
|
return NULL;
|
|
|
|
h2 = from_hash(handle >> 16);
|
|
if (h2 > 32)
|
|
return NULL;
|
|
|
|
b = rtnl_dereference(head->table[h1]);
|
|
if (b) {
|
|
for (f = rtnl_dereference(b->ht[h2]);
|
|
f;
|
|
f = rtnl_dereference(f->next))
|
|
if (f->handle == handle)
|
|
return f;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int route4_init(struct tcf_proto *tp)
|
|
{
|
|
struct route4_head *head;
|
|
|
|
head = kzalloc(sizeof(struct route4_head), GFP_KERNEL);
|
|
if (head == NULL)
|
|
return -ENOBUFS;
|
|
|
|
rcu_assign_pointer(tp->root, head);
|
|
return 0;
|
|
}
|
|
|
|
static void __route4_delete_filter(struct route4_filter *f)
|
|
{
|
|
tcf_exts_destroy(&f->exts);
|
|
tcf_exts_put_net(&f->exts);
|
|
kfree(f);
|
|
}
|
|
|
|
static void route4_delete_filter_work(struct work_struct *work)
|
|
{
|
|
struct route4_filter *f = container_of(work, struct route4_filter, work);
|
|
|
|
rtnl_lock();
|
|
__route4_delete_filter(f);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static void route4_delete_filter(struct rcu_head *head)
|
|
{
|
|
struct route4_filter *f = container_of(head, struct route4_filter, rcu);
|
|
|
|
INIT_WORK(&f->work, route4_delete_filter_work);
|
|
tcf_queue_work(&f->work);
|
|
}
|
|
|
|
static void route4_destroy(struct tcf_proto *tp)
|
|
{
|
|
struct route4_head *head = rtnl_dereference(tp->root);
|
|
int h1, h2;
|
|
|
|
if (head == NULL)
|
|
return;
|
|
|
|
for (h1 = 0; h1 <= 256; h1++) {
|
|
struct route4_bucket *b;
|
|
|
|
b = rtnl_dereference(head->table[h1]);
|
|
if (b) {
|
|
for (h2 = 0; h2 <= 32; h2++) {
|
|
struct route4_filter *f;
|
|
|
|
while ((f = rtnl_dereference(b->ht[h2])) != NULL) {
|
|
struct route4_filter *next;
|
|
|
|
next = rtnl_dereference(f->next);
|
|
RCU_INIT_POINTER(b->ht[h2], next);
|
|
tcf_unbind_filter(tp, &f->res);
|
|
if (tcf_exts_get_net(&f->exts))
|
|
call_rcu(&f->rcu, route4_delete_filter);
|
|
else
|
|
__route4_delete_filter(f);
|
|
}
|
|
}
|
|
RCU_INIT_POINTER(head->table[h1], NULL);
|
|
kfree_rcu(b, rcu);
|
|
}
|
|
}
|
|
kfree_rcu(head, rcu);
|
|
}
|
|
|
|
static int route4_delete(struct tcf_proto *tp, void *arg, bool *last)
|
|
{
|
|
struct route4_head *head = rtnl_dereference(tp->root);
|
|
struct route4_filter *f = arg;
|
|
struct route4_filter __rcu **fp;
|
|
struct route4_filter *nf;
|
|
struct route4_bucket *b;
|
|
unsigned int h = 0;
|
|
int i, h1;
|
|
|
|
if (!head || !f)
|
|
return -EINVAL;
|
|
|
|
h = f->handle;
|
|
b = f->bkt;
|
|
|
|
fp = &b->ht[from_hash(h >> 16)];
|
|
for (nf = rtnl_dereference(*fp); nf;
|
|
fp = &nf->next, nf = rtnl_dereference(*fp)) {
|
|
if (nf == f) {
|
|
/* unlink it */
|
|
RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
|
|
|
|
/* Remove any fastmap lookups that might ref filter
|
|
* notice we unlink'd the filter so we can't get it
|
|
* back in the fastmap.
|
|
*/
|
|
route4_reset_fastmap(head);
|
|
|
|
/* Delete it */
|
|
tcf_unbind_filter(tp, &f->res);
|
|
tcf_exts_get_net(&f->exts);
|
|
call_rcu(&f->rcu, route4_delete_filter);
|
|
|
|
/* Strip RTNL protected tree */
|
|
for (i = 0; i <= 32; i++) {
|
|
struct route4_filter *rt;
|
|
|
|
rt = rtnl_dereference(b->ht[i]);
|
|
if (rt)
|
|
goto out;
|
|
}
|
|
|
|
/* OK, session has no flows */
|
|
RCU_INIT_POINTER(head->table[to_hash(h)], NULL);
|
|
kfree_rcu(b, rcu);
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
*last = true;
|
|
for (h1 = 0; h1 <= 256; h1++) {
|
|
if (rcu_access_pointer(head->table[h1])) {
|
|
*last = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
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 net *net, 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,
|
|
bool ovr)
|
|
{
|
|
u32 id = 0, to = 0, nhandle = 0x8000;
|
|
struct route4_filter *fp;
|
|
unsigned int h1;
|
|
struct route4_bucket *b;
|
|
int err;
|
|
|
|
err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tb[TCA_ROUTE4_TO]) {
|
|
if (new && handle & 0x8000)
|
|
return -EINVAL;
|
|
to = nla_get_u32(tb[TCA_ROUTE4_TO]);
|
|
if (to > 0xFF)
|
|
return -EINVAL;
|
|
nhandle = to;
|
|
}
|
|
|
|
if (tb[TCA_ROUTE4_FROM]) {
|
|
if (tb[TCA_ROUTE4_IIF])
|
|
return -EINVAL;
|
|
id = nla_get_u32(tb[TCA_ROUTE4_FROM]);
|
|
if (id > 0xFF)
|
|
return -EINVAL;
|
|
nhandle |= id << 16;
|
|
} else if (tb[TCA_ROUTE4_IIF]) {
|
|
id = nla_get_u32(tb[TCA_ROUTE4_IIF]);
|
|
if (id > 0x7FFF)
|
|
return -EINVAL;
|
|
nhandle |= (id | 0x8000) << 16;
|
|
} else
|
|
nhandle |= 0xFFFF << 16;
|
|
|
|
if (handle && new) {
|
|
nhandle |= handle & 0x7F00;
|
|
if (nhandle != handle)
|
|
return -EINVAL;
|
|
}
|
|
|
|
h1 = to_hash(nhandle);
|
|
b = rtnl_dereference(head->table[h1]);
|
|
if (!b) {
|
|
b = kzalloc(sizeof(struct route4_bucket), GFP_KERNEL);
|
|
if (b == NULL)
|
|
return -ENOBUFS;
|
|
|
|
rcu_assign_pointer(head->table[h1], b);
|
|
} else {
|
|
unsigned int h2 = from_hash(nhandle >> 16);
|
|
|
|
for (fp = rtnl_dereference(b->ht[h2]);
|
|
fp;
|
|
fp = rtnl_dereference(fp->next))
|
|
if (fp->handle == f->handle)
|
|
return -EEXIST;
|
|
}
|
|
|
|
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;
|
|
f->tp = tp;
|
|
|
|
if (tb[TCA_ROUTE4_CLASSID]) {
|
|
f->res.classid = nla_get_u32(tb[TCA_ROUTE4_CLASSID]);
|
|
tcf_bind_filter(tp, &f->res, base);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int route4_change(struct net *net, struct sk_buff *in_skb,
|
|
struct tcf_proto *tp, unsigned long base, u32 handle,
|
|
struct nlattr **tca, void **arg, bool ovr)
|
|
{
|
|
struct route4_head *head = rtnl_dereference(tp->root);
|
|
struct route4_filter __rcu **fp;
|
|
struct route4_filter *fold, *f1, *pfp, *f = NULL;
|
|
struct route4_bucket *b;
|
|
struct nlattr *opt = tca[TCA_OPTIONS];
|
|
struct nlattr *tb[TCA_ROUTE4_MAX + 1];
|
|
unsigned int h, th;
|
|
int err;
|
|
bool new = true;
|
|
|
|
if (opt == NULL)
|
|
return handle ? -EINVAL : 0;
|
|
|
|
err = nla_parse_nested(tb, TCA_ROUTE4_MAX, opt, route4_policy, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
fold = *arg;
|
|
if (fold && handle && fold->handle != handle)
|
|
return -EINVAL;
|
|
|
|
err = -ENOBUFS;
|
|
f = kzalloc(sizeof(struct route4_filter), GFP_KERNEL);
|
|
if (!f)
|
|
goto errout;
|
|
|
|
err = tcf_exts_init(&f->exts, TCA_ROUTE4_ACT, TCA_ROUTE4_POLICE);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
if (fold) {
|
|
f->id = fold->id;
|
|
f->iif = fold->iif;
|
|
f->res = fold->res;
|
|
f->handle = fold->handle;
|
|
|
|
f->tp = fold->tp;
|
|
f->bkt = fold->bkt;
|
|
new = false;
|
|
}
|
|
|
|
err = route4_set_parms(net, tp, base, f, handle, head, tb,
|
|
tca[TCA_RATE], new, ovr);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
h = from_hash(f->handle >> 16);
|
|
fp = &f->bkt->ht[h];
|
|
for (pfp = rtnl_dereference(*fp);
|
|
(f1 = rtnl_dereference(*fp)) != NULL;
|
|
fp = &f1->next)
|
|
if (f->handle < f1->handle)
|
|
break;
|
|
|
|
netif_keep_dst(qdisc_dev(tp->q));
|
|
rcu_assign_pointer(f->next, f1);
|
|
rcu_assign_pointer(*fp, f);
|
|
|
|
if (fold && fold->handle && f->handle != fold->handle) {
|
|
th = to_hash(fold->handle);
|
|
h = from_hash(fold->handle >> 16);
|
|
b = rtnl_dereference(head->table[th]);
|
|
if (b) {
|
|
fp = &b->ht[h];
|
|
for (pfp = rtnl_dereference(*fp); pfp;
|
|
fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
|
|
if (pfp == f) {
|
|
*fp = f->next;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
route4_reset_fastmap(head);
|
|
*arg = f;
|
|
if (fold) {
|
|
tcf_unbind_filter(tp, &fold->res);
|
|
tcf_exts_get_net(&fold->exts);
|
|
call_rcu(&fold->rcu, route4_delete_filter);
|
|
}
|
|
return 0;
|
|
|
|
errout:
|
|
if (f)
|
|
tcf_exts_destroy(&f->exts);
|
|
kfree(f);
|
|
return err;
|
|
}
|
|
|
|
static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg)
|
|
{
|
|
struct route4_head *head = rtnl_dereference(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 = rtnl_dereference(head->table[h]);
|
|
|
|
if (b) {
|
|
for (h1 = 0; h1 <= 32; h1++) {
|
|
struct route4_filter *f;
|
|
|
|
for (f = rtnl_dereference(b->ht[h1]);
|
|
f;
|
|
f = rtnl_dereference(f->next)) {
|
|
if (arg->count < arg->skip) {
|
|
arg->count++;
|
|
continue;
|
|
}
|
|
if (arg->fn(tp, f, arg) < 0) {
|
|
arg->stop = 1;
|
|
return;
|
|
}
|
|
arg->count++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int route4_dump(struct net *net, struct tcf_proto *tp, void *fh,
|
|
struct sk_buff *skb, struct tcmsg *t)
|
|
{
|
|
struct route4_filter *f = fh;
|
|
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;
|
|
if (nla_put_u32(skb, TCA_ROUTE4_TO, id))
|
|
goto nla_put_failure;
|
|
}
|
|
if (f->handle & 0x80000000) {
|
|
if ((f->handle >> 16) != 0xFFFF &&
|
|
nla_put_u32(skb, TCA_ROUTE4_IIF, f->iif))
|
|
goto nla_put_failure;
|
|
} else {
|
|
id = f->id >> 16;
|
|
if (nla_put_u32(skb, TCA_ROUTE4_FROM, id))
|
|
goto nla_put_failure;
|
|
}
|
|
if (f->res.classid &&
|
|
nla_put_u32(skb, TCA_ROUTE4_CLASSID, f->res.classid))
|
|
goto nla_put_failure;
|
|
|
|
if (tcf_exts_dump(skb, &f->exts) < 0)
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
|
|
if (tcf_exts_dump_stats(skb, &f->exts) < 0)
|
|
goto nla_put_failure;
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, nest);
|
|
return -1;
|
|
}
|
|
|
|
static void route4_bind_class(void *fh, u32 classid, unsigned long cl)
|
|
{
|
|
struct route4_filter *f = fh;
|
|
|
|
if (f && f->res.classid == classid)
|
|
f->res.class = cl;
|
|
}
|
|
|
|
static struct tcf_proto_ops cls_route4_ops __read_mostly = {
|
|
.kind = "route",
|
|
.classify = route4_classify,
|
|
.init = route4_init,
|
|
.destroy = route4_destroy,
|
|
.get = route4_get,
|
|
.change = route4_change,
|
|
.delete = route4_delete,
|
|
.walk = route4_walk,
|
|
.dump = route4_dump,
|
|
.bind_class = route4_bind_class,
|
|
.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");
|