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cls_u32.c
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/*
* net/sched/cls_u32.c Ugly (or Universal) 32bit key Packet 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>
*
* The filters are packed to hash tables of key nodes
* with a set of 32bit key/mask pairs at every node.
* Nodes reference next level hash tables etc.
*
* This scheme is the best universal classifier I managed to
* invent; it is not super-fast, but it is not slow (provided you
* program it correctly), and general enough. And its relative
* speed grows as the number of rules becomes larger.
*
* It seems that it represents the best middle point between
* speed and manageability both by human and by machine.
*
* It is especially useful for link sharing combined with QoS;
* pure RSVP doesn't need such a general approach and can use
* much simpler (and faster) schemes, sort of cls_rsvp.c.
*
* JHS: We should remove the CONFIG_NET_CLS_IND from here
* eventually when the meta match extension is made available
*
* nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
*/
#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/percpu.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <linux/bitmap.h>
#include <linux/netdevice.h>
#include <linux/hash.h>
#include <net/netlink.h>
#include <net/act_api.h>
#include <net/pkt_cls.h>
#include <linux/idr.h>
struct tc_u_knode {
struct tc_u_knode __rcu *next;
u32 handle;
struct tc_u_hnode __rcu *ht_up;
struct tcf_exts exts;
#ifdef CONFIG_NET_CLS_IND
int ifindex;
#endif
u8 fshift;
struct tcf_result res;
struct tc_u_hnode __rcu *ht_down;
#ifdef CONFIG_CLS_U32_PERF
struct tc_u32_pcnt __percpu *pf;
#endif
u32 flags;
#ifdef CONFIG_CLS_U32_MARK
u32 val;
u32 mask;
u32 __percpu *pcpu_success;
#endif
struct tcf_proto *tp;
union {
struct work_struct work;
struct rcu_head rcu;
};
/* The 'sel' field MUST be the last field in structure to allow for
* tc_u32_keys allocated at end of structure.
*/
struct tc_u32_sel sel;
};
struct tc_u_hnode {
struct tc_u_hnode __rcu *next;
u32 handle;
u32 prio;
struct tc_u_common *tp_c;
int refcnt;
unsigned int divisor;
struct idr handle_idr;
struct rcu_head rcu;
/* The 'ht' field MUST be the last field in structure to allow for
* more entries allocated at end of structure.
*/
struct tc_u_knode __rcu *ht[1];
};
struct tc_u_common {
struct tc_u_hnode __rcu *hlist;
struct tcf_block *block;
int refcnt;
struct idr handle_idr;
struct hlist_node hnode;
struct rcu_head rcu;
};
static inline unsigned int u32_hash_fold(__be32 key,
const struct tc_u32_sel *sel,
u8 fshift)
{
unsigned int h = ntohl(key & sel->hmask) >> fshift;
return h;
}
static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res)
{
struct {
struct tc_u_knode *knode;
unsigned int off;
} stack[TC_U32_MAXDEPTH];
struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
unsigned int off = skb_network_offset(skb);
struct tc_u_knode *n;
int sdepth = 0;
int off2 = 0;
int sel = 0;
#ifdef CONFIG_CLS_U32_PERF
int j;
#endif
int i, r;
next_ht:
n = rcu_dereference_bh(ht->ht[sel]);
next_knode:
if (n) {
struct tc_u32_key *key = n->sel.keys;
#ifdef CONFIG_CLS_U32_PERF
__this_cpu_inc(n->pf->rcnt);
j = 0;
#endif
if (tc_skip_sw(n->flags)) {
n = rcu_dereference_bh(n->next);
goto next_knode;
}
#ifdef CONFIG_CLS_U32_MARK
if ((skb->mark & n->mask) != n->val) {
n = rcu_dereference_bh(n->next);
goto next_knode;
} else {
__this_cpu_inc(*n->pcpu_success);
}
#endif
for (i = n->sel.nkeys; i > 0; i--, key++) {
int toff = off + key->off + (off2 & key->offmask);
__be32 *data, hdata;
if (skb_headroom(skb) + toff > INT_MAX)
goto out;
data = skb_header_pointer(skb, toff, 4, &hdata);
if (!data)
goto out;
if ((*data ^ key->val) & key->mask) {
n = rcu_dereference_bh(n->next);
goto next_knode;
}
#ifdef CONFIG_CLS_U32_PERF
__this_cpu_inc(n->pf->kcnts[j]);
j++;
#endif
}
ht = rcu_dereference_bh(n->ht_down);
if (!ht) {
check_terminal:
if (n->sel.flags & TC_U32_TERMINAL) {
*res = n->res;
#ifdef CONFIG_NET_CLS_IND
if (!tcf_match_indev(skb, n->ifindex)) {
n = rcu_dereference_bh(n->next);
goto next_knode;
}
#endif
#ifdef CONFIG_CLS_U32_PERF
__this_cpu_inc(n->pf->rhit);
#endif
r = tcf_exts_exec(skb, &n->exts, res);
if (r < 0) {
n = rcu_dereference_bh(n->next);
goto next_knode;
}
return r;
}
n = rcu_dereference_bh(n->next);
goto next_knode;
}
/* PUSH */
if (sdepth >= TC_U32_MAXDEPTH)
goto deadloop;
stack[sdepth].knode = n;
stack[sdepth].off = off;
sdepth++;
ht = rcu_dereference_bh(n->ht_down);
sel = 0;
if (ht->divisor) {
__be32 *data, hdata;
data = skb_header_pointer(skb, off + n->sel.hoff, 4,
&hdata);
if (!data)
goto out;
sel = ht->divisor & u32_hash_fold(*data, &n->sel,
n->fshift);
}
if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
goto next_ht;
if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
off2 = n->sel.off + 3;
if (n->sel.flags & TC_U32_VAROFFSET) {
__be16 *data, hdata;
data = skb_header_pointer(skb,
off + n->sel.offoff,
2, &hdata);
if (!data)
goto out;
off2 += ntohs(n->sel.offmask & *data) >>
n->sel.offshift;
}
off2 &= ~3;
}
if (n->sel.flags & TC_U32_EAT) {
off += off2;
off2 = 0;
}
if (off < skb->len)
goto next_ht;
}
/* POP */
if (sdepth--) {
n = stack[sdepth].knode;
ht = rcu_dereference_bh(n->ht_up);
off = stack[sdepth].off;
goto check_terminal;
}
out:
return -1;
deadloop:
net_warn_ratelimited("cls_u32: dead loop\n");
return -1;
}
static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
{
struct tc_u_hnode *ht;
for (ht = rtnl_dereference(tp_c->hlist);
ht;
ht = rtnl_dereference(ht->next))
if (ht->handle == handle)
break;
return ht;
}
static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
{
unsigned int sel;
struct tc_u_knode *n = NULL;
sel = TC_U32_HASH(handle);
if (sel > ht->divisor)
goto out;
for (n = rtnl_dereference(ht->ht[sel]);
n;
n = rtnl_dereference(n->next))
if (n->handle == handle)
break;
out:
return n;
}
static void *u32_get(struct tcf_proto *tp, u32 handle)
{
struct tc_u_hnode *ht;
struct tc_u_common *tp_c = tp->data;
if (TC_U32_HTID(handle) == TC_U32_ROOT)
ht = rtnl_dereference(tp->root);
else
ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
if (!ht)
return NULL;
if (TC_U32_KEY(handle) == 0)
return ht;
return u32_lookup_key(ht, handle);
}
static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
{
unsigned long idr_index;
int err;
/* This is only used inside rtnl lock it is safe to increment
* without read _copy_ update semantics
*/
err = idr_alloc_ext(&tp_c->handle_idr, ptr, &idr_index,
1, 0x7FF, GFP_KERNEL);
if (err)
return 0;
return (u32)(idr_index | 0x800) << 20;
}
static struct hlist_head *tc_u_common_hash;
#define U32_HASH_SHIFT 10
#define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
static unsigned int tc_u_hash(const struct tcf_proto *tp)
{
return hash_ptr(tp->chain->block, U32_HASH_SHIFT);
}
static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
{
struct tc_u_common *tc;
unsigned int h;
h = tc_u_hash(tp);
hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
if (tc->block == tp->chain->block)
return tc;
}
return NULL;
}
static int u32_init(struct tcf_proto *tp)
{
struct tc_u_hnode *root_ht;
struct tc_u_common *tp_c;
unsigned int h;
tp_c = tc_u_common_find(tp);
root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
if (root_ht == NULL)
return -ENOBUFS;
root_ht->refcnt++;
root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
root_ht->prio = tp->prio;
idr_init(&root_ht->handle_idr);
if (tp_c == NULL) {
tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
if (tp_c == NULL) {
kfree(root_ht);
return -ENOBUFS;
}
tp_c->block = tp->chain->block;
INIT_HLIST_NODE(&tp_c->hnode);
idr_init(&tp_c->handle_idr);
h = tc_u_hash(tp);
hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
}
tp_c->refcnt++;
RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
rcu_assign_pointer(tp_c->hlist, root_ht);
root_ht->tp_c = tp_c;
rcu_assign_pointer(tp->root, root_ht);
tp->data = tp_c;
return 0;
}
static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
bool free_pf)
{
tcf_exts_destroy(&n->exts);
tcf_exts_put_net(&n->exts);
if (n->ht_down)
n->ht_down->refcnt--;
#ifdef CONFIG_CLS_U32_PERF
if (free_pf)
free_percpu(n->pf);
#endif
#ifdef CONFIG_CLS_U32_MARK
if (free_pf)
free_percpu(n->pcpu_success);
#endif
kfree(n);
return 0;
}
/* u32_delete_key_rcu should be called when free'ing a copied
* version of a tc_u_knode obtained from u32_init_knode(). When
* copies are obtained from u32_init_knode() the statistics are
* shared between the old and new copies to allow readers to
* continue to update the statistics during the copy. To support
* this the u32_delete_key_rcu variant does not free the percpu
* statistics.
*/
static void u32_delete_key_work(struct work_struct *work)
{
struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
rtnl_lock();
u32_destroy_key(key->tp, key, false);
rtnl_unlock();
}
static void u32_delete_key_rcu(struct rcu_head *rcu)
{
struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
INIT_WORK(&key->work, u32_delete_key_work);
tcf_queue_work(&key->work);
}
/* u32_delete_key_freepf_rcu is the rcu callback variant
* that free's the entire structure including the statistics
* percpu variables. Only use this if the key is not a copy
* returned by u32_init_knode(). See u32_delete_key_rcu()
* for the variant that should be used with keys return from
* u32_init_knode()
*/
static void u32_delete_key_freepf_work(struct work_struct *work)
{
struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
rtnl_lock();
u32_destroy_key(key->tp, key, true);
rtnl_unlock();
}
static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
{
struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
INIT_WORK(&key->work, u32_delete_key_freepf_work);
tcf_queue_work(&key->work);
}
static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
{
struct tc_u_knode __rcu **kp;
struct tc_u_knode *pkp;
struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
if (ht) {
kp = &ht->ht[TC_U32_HASH(key->handle)];
for (pkp = rtnl_dereference(*kp); pkp;
kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
if (pkp == key) {
RCU_INIT_POINTER(*kp, key->next);
tcf_unbind_filter(tp, &key->res);
tcf_exts_get_net(&key->exts);
call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
return 0;
}
}
}
WARN_ON(1);
return 0;
}
static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h)
{
struct tcf_block *block = tp->chain->block;
struct tc_cls_u32_offload cls_u32 = {};
tc_cls_common_offload_init_deprecated(&cls_u32.common, tp, NULL);
cls_u32.command = TC_CLSU32_DELETE_HNODE;
cls_u32.hnode.divisor = h->divisor;
cls_u32.hnode.handle = h->handle;
cls_u32.hnode.prio = h->prio;
tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
}
static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
u32 flags, struct netlink_ext_ack *extack)
{
struct tcf_block *block = tp->chain->block;
struct tc_cls_u32_offload cls_u32 = {};
bool skip_sw = tc_skip_sw(flags);
bool offloaded = false;
int err;
tc_cls_common_offload_init_deprecated(&cls_u32.common, tp, extack);
cls_u32.command = TC_CLSU32_NEW_HNODE;
cls_u32.hnode.divisor = h->divisor;
cls_u32.hnode.handle = h->handle;
cls_u32.hnode.prio = h->prio;
err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
if (err < 0) {
u32_clear_hw_hnode(tp, h);
return err;
} else if (err > 0) {
offloaded = true;
}
if (skip_sw && !offloaded)
return -EINVAL;
return 0;
}
static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n)
{
struct tcf_block *block = tp->chain->block;
struct tc_cls_u32_offload cls_u32 = {};
tc_cls_common_offload_init_deprecated(&cls_u32.common, tp, NULL);
cls_u32.command = TC_CLSU32_DELETE_KNODE;
cls_u32.knode.handle = n->handle;
tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
tcf_block_offload_dec(block, &n->flags);
}
static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
u32 flags, struct netlink_ext_ack *extack)
{
struct tcf_block *block = tp->chain->block;
struct tc_cls_u32_offload cls_u32 = {};
bool skip_sw = tc_skip_sw(flags);
int err;
tc_cls_common_offload_init_deprecated(&cls_u32.common, tp, extack);
cls_u32.command = TC_CLSU32_REPLACE_KNODE;
cls_u32.knode.handle = n->handle;
cls_u32.knode.fshift = n->fshift;
#ifdef CONFIG_CLS_U32_MARK
cls_u32.knode.val = n->val;
cls_u32.knode.mask = n->mask;
#else
cls_u32.knode.val = 0;
cls_u32.knode.mask = 0;
#endif
cls_u32.knode.sel = &n->sel;
cls_u32.knode.exts = &n->exts;
if (n->ht_down)
cls_u32.knode.link_handle = n->ht_down->handle;
err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
if (err < 0) {
u32_remove_hw_knode(tp, n);
return err;
} else if (err > 0) {
tcf_block_offload_inc(block, &n->flags);
}
if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
return -EINVAL;
return 0;
}
static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
{
struct tc_u_knode *n;
unsigned int h;
for (h = 0; h <= ht->divisor; h++) {
while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
RCU_INIT_POINTER(ht->ht[h],
rtnl_dereference(n->next));
tcf_unbind_filter(tp, &n->res);
u32_remove_hw_knode(tp, n);
idr_remove_ext(&ht->handle_idr, n->handle);
if (tcf_exts_get_net(&n->exts))
call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
else
u32_destroy_key(n->tp, n, true);
}
}
}
static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
{
struct tc_u_common *tp_c = tp->data;
struct tc_u_hnode __rcu **hn;
struct tc_u_hnode *phn;
WARN_ON(ht->refcnt);
u32_clear_hnode(tp, ht);
hn = &tp_c->hlist;
for (phn = rtnl_dereference(*hn);
phn;
hn = &phn->next, phn = rtnl_dereference(*hn)) {
if (phn == ht) {
u32_clear_hw_hnode(tp, ht);
idr_destroy(&ht->handle_idr);
idr_remove_ext(&tp_c->handle_idr, ht->handle);
RCU_INIT_POINTER(*hn, ht->next);
kfree_rcu(ht, rcu);
return 0;
}
}
return -ENOENT;
}
static bool ht_empty(struct tc_u_hnode *ht)
{
unsigned int h;
for (h = 0; h <= ht->divisor; h++)
if (rcu_access_pointer(ht->ht[h]))
return false;
return true;
}
static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
{
struct tc_u_common *tp_c = tp->data;
struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
WARN_ON(root_ht == NULL);
if (root_ht && --root_ht->refcnt == 0)
u32_destroy_hnode(tp, root_ht);
if (--tp_c->refcnt == 0) {
struct tc_u_hnode *ht;
hlist_del(&tp_c->hnode);
for (ht = rtnl_dereference(tp_c->hlist);
ht;
ht = rtnl_dereference(ht->next)) {
ht->refcnt--;
u32_clear_hnode(tp, ht);
}
while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
RCU_INIT_POINTER(tp_c->hlist, ht->next);
kfree_rcu(ht, rcu);
}
idr_destroy(&tp_c->handle_idr);
kfree(tp_c);
}
tp->data = NULL;
}
static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
struct netlink_ext_ack *extack)
{
struct tc_u_hnode *ht = arg;
struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
struct tc_u_common *tp_c = tp->data;
int ret = 0;
if (ht == NULL)
goto out;
if (TC_U32_KEY(ht->handle)) {
u32_remove_hw_knode(tp, (struct tc_u_knode *)ht);
ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
goto out;
}
if (root_ht == ht) {
NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
return -EINVAL;
}
if (ht->refcnt == 1) {
ht->refcnt--;
u32_destroy_hnode(tp, ht);
} else {
NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
return -EBUSY;
}
out:
*last = true;
if (root_ht) {
if (root_ht->refcnt > 1) {
*last = false;
goto ret;
}
if (root_ht->refcnt == 1) {
if (!ht_empty(root_ht)) {
*last = false;
goto ret;
}
}
}
if (tp_c->refcnt > 1) {
*last = false;
goto ret;
}
if (tp_c->refcnt == 1) {
struct tc_u_hnode *ht;
for (ht = rtnl_dereference(tp_c->hlist);
ht;
ht = rtnl_dereference(ht->next))
if (!ht_empty(ht)) {
*last = false;
break;
}
}
ret:
return ret;
}
static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
{
unsigned long idr_index;
u32 start = htid | 0x800;
u32 max = htid | 0xFFF;
u32 min = htid;
if (idr_alloc_ext(&ht->handle_idr, NULL, &idr_index,
start, max + 1, GFP_KERNEL)) {
if (idr_alloc_ext(&ht->handle_idr, NULL, &idr_index,
min + 1, max + 1, GFP_KERNEL))
return max;
}
return (u32)idr_index;
}
static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
[TCA_U32_CLASSID] = { .type = NLA_U32 },
[TCA_U32_HASH] = { .type = NLA_U32 },
[TCA_U32_LINK] = { .type = NLA_U32 },
[TCA_U32_DIVISOR] = { .type = NLA_U32 },
[TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
[TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
[TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
[TCA_U32_FLAGS] = { .type = NLA_U32 },
};
static int u32_set_parms(struct net *net, struct tcf_proto *tp,
unsigned long base, struct tc_u_hnode *ht,
struct tc_u_knode *n, struct nlattr **tb,
struct nlattr *est, bool ovr,
struct netlink_ext_ack *extack)
{
int err;
err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
if (err < 0)
return err;
if (tb[TCA_U32_LINK]) {
u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
struct tc_u_hnode *ht_down = NULL, *ht_old;
if (TC_U32_KEY(handle)) {
NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
return -EINVAL;
}
if (handle) {
ht_down = u32_lookup_ht(ht->tp_c, handle);
if (!ht_down) {
NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
return -EINVAL;
}
ht_down->refcnt++;
}
ht_old = rtnl_dereference(n->ht_down);
rcu_assign_pointer(n->ht_down, ht_down);
if (ht_old)
ht_old->refcnt--;
}
if (tb[TCA_U32_CLASSID]) {
n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
tcf_bind_filter(tp, &n->res, base);
}
#ifdef CONFIG_NET_CLS_IND
if (tb[TCA_U32_INDEV]) {
int ret;
ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
if (ret < 0)
return -EINVAL;
n->ifindex = ret;
}
#endif
return 0;
}
static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
struct tc_u_knode *n)
{
struct tc_u_knode __rcu **ins;
struct tc_u_knode *pins;
struct tc_u_hnode *ht;
if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
ht = rtnl_dereference(tp->root);
else
ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
ins = &ht->ht[TC_U32_HASH(n->handle)];
/* The node must always exist for it to be replaced if this is not the
* case then something went very wrong elsewhere.
*/
for (pins = rtnl_dereference(*ins); ;
ins = &pins->next, pins = rtnl_dereference(*ins))
if (pins->handle == n->handle)
break;
idr_replace_ext(&ht->handle_idr, n, n->handle);
RCU_INIT_POINTER(n->next, pins->next);
rcu_assign_pointer(*ins, n);
}
static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
struct tc_u_knode *n)
{
struct tc_u_knode *new;
struct tc_u32_sel *s = &n->sel;
new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
GFP_KERNEL);
if (!new)
return NULL;
RCU_INIT_POINTER(new->next, n->next);
new->handle = n->handle;
RCU_INIT_POINTER(new->ht_up, n->ht_up);
#ifdef CONFIG_NET_CLS_IND
new->ifindex = n->ifindex;
#endif
new->fshift = n->fshift;
new->res = n->res;
new->flags = n->flags;
RCU_INIT_POINTER(new->ht_down, n->ht_down);
/* bump reference count as long as we hold pointer to structure */
if (new->ht_down)
new->ht_down->refcnt++;
#ifdef CONFIG_CLS_U32_PERF
/* Statistics may be incremented by readers during update
* so we must keep them in tact. When the node is later destroyed
* a special destroy call must be made to not free the pf memory.
*/
new->pf = n->pf;
#endif
#ifdef CONFIG_CLS_U32_MARK
new->val = n->val;
new->mask = n->mask;
/* Similarly success statistics must be moved as pointers */
new->pcpu_success = n->pcpu_success;
#endif
new->tp = tp;
memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
kfree(new);
return NULL;
}
return new;
}
static int u32_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 netlink_ext_ack *extack)
{
struct tc_u_common *tp_c = tp->data;
struct tc_u_hnode *ht;
struct tc_u_knode *n;
struct tc_u32_sel *s;
struct nlattr *opt = tca[TCA_OPTIONS];
struct nlattr *tb[TCA_U32_MAX + 1];
u32 htid, flags = 0;
int err;
#ifdef CONFIG_CLS_U32_PERF
size_t size;
#endif
if (!opt) {
if (handle) {
NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
return -EINVAL;
} else {
return 0;
}
}
err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
if (err < 0)
return err;
if (tb[TCA_U32_FLAGS]) {
flags = nla_get_u32(tb[TCA_U32_FLAGS]);
if (!tc_flags_valid(flags)) {
NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
return -EINVAL;
}
}
n = *arg;
if (n) {
struct tc_u_knode *new;
if (TC_U32_KEY(n->handle) == 0) {
NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
return -EINVAL;
}
if (n->flags != flags) {
NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
return -EINVAL;
}
new = u32_init_knode(tp, n);
if (!new)
return -ENOMEM;
err = u32_set_parms(net, tp, base,
rtnl_dereference(n->ht_up), new, tb,
tca[TCA_RATE], ovr, extack);
if (err) {
u32_destroy_key(tp, new, false);
return err;
}
err = u32_replace_hw_knode(tp, new, flags, extack);
if (err) {
u32_destroy_key(tp, new, false);
return err;
}
if (!tc_in_hw(new->flags))
new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
u32_replace_knode(tp, tp_c, new);
tcf_unbind_filter(tp, &n->res);
tcf_exts_get_net(&n->exts);
call_rcu(&n->rcu, u32_delete_key_rcu);
return 0;
}
if (tb[TCA_U32_DIVISOR]) {
unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
if (--divisor > 0x100) {
NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
return -EINVAL;
}
if (TC_U32_KEY(handle)) {
NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
return -EINVAL;
}
ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
if (ht == NULL)
return -ENOBUFS;
if (handle == 0) {
handle = gen_new_htid(tp->data, ht);
if (handle == 0) {