mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Cong Wang](/assets/img/avatar_default.png)
TC action ->init() API has 10 parameters, it becomes harder to read. Some of them are just boolean and can be replaced by flags. Similarly for the internal API tcf_action_init() and tcf_exts_validate(). This patch converts them to flags and fold them into the upper 16 bits of "flags", whose lower 16 bits are still reserved for user-space. More specifically, the following kernel flags are introduced: TCA_ACT_FLAGS_POLICE replace 'name' in a few contexts, to distinguish whether it is compatible with policer. TCA_ACT_FLAGS_BIND replaces 'bind', to indicate whether this action is bound to a filter. TCA_ACT_FLAGS_REPLACE replaces 'ovr' in most contexts, means we are replacing an existing action. TCA_ACT_FLAGS_NO_RTNL replaces 'rtnl_held' but has the opposite meaning, because we still hold RTNL in most cases. The only user-space flag TCA_ACT_FLAGS_NO_PERCPU_STATS is untouched and still stored as before. I have tested this patch with tdc and I do not see any failure related to this patch. Tested-by: Vlad Buslov <vladbu@nvidia.com> Acked-by: Jamal Hadi Salim<jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Cong Wang <cong.wang@bytedance.com> Signed-off-by: David S. Miller <davem@davemloft.net>
725 lines
16 KiB
C
725 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* net/sched/cls_flow.c Generic flow classifier
|
|
*
|
|
* Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/list.h>
|
|
#include <linux/jhash.h>
|
|
#include <linux/random.h>
|
|
#include <linux/pkt_cls.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/in.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/ipv6.h>
|
|
#include <linux/if_vlan.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <net/inet_sock.h>
|
|
|
|
#include <net/pkt_cls.h>
|
|
#include <net/ip.h>
|
|
#include <net/route.h>
|
|
#include <net/flow_dissector.h>
|
|
|
|
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
|
|
#include <net/netfilter/nf_conntrack.h>
|
|
#endif
|
|
|
|
struct flow_head {
|
|
struct list_head filters;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
struct flow_filter {
|
|
struct list_head list;
|
|
struct tcf_exts exts;
|
|
struct tcf_ematch_tree ematches;
|
|
struct tcf_proto *tp;
|
|
struct timer_list perturb_timer;
|
|
u32 perturb_period;
|
|
u32 handle;
|
|
|
|
u32 nkeys;
|
|
u32 keymask;
|
|
u32 mode;
|
|
u32 mask;
|
|
u32 xor;
|
|
u32 rshift;
|
|
u32 addend;
|
|
u32 divisor;
|
|
u32 baseclass;
|
|
u32 hashrnd;
|
|
struct rcu_work rwork;
|
|
};
|
|
|
|
static inline u32 addr_fold(void *addr)
|
|
{
|
|
unsigned long a = (unsigned long)addr;
|
|
|
|
return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0);
|
|
}
|
|
|
|
static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow)
|
|
{
|
|
__be32 src = flow_get_u32_src(flow);
|
|
|
|
if (src)
|
|
return ntohl(src);
|
|
|
|
return addr_fold(skb->sk);
|
|
}
|
|
|
|
static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow)
|
|
{
|
|
__be32 dst = flow_get_u32_dst(flow);
|
|
|
|
if (dst)
|
|
return ntohl(dst);
|
|
|
|
return addr_fold(skb_dst(skb)) ^ (__force u16)skb_protocol(skb, true);
|
|
}
|
|
|
|
static u32 flow_get_proto(const struct sk_buff *skb,
|
|
const struct flow_keys *flow)
|
|
{
|
|
return flow->basic.ip_proto;
|
|
}
|
|
|
|
static u32 flow_get_proto_src(const struct sk_buff *skb,
|
|
const struct flow_keys *flow)
|
|
{
|
|
if (flow->ports.ports)
|
|
return ntohs(flow->ports.src);
|
|
|
|
return addr_fold(skb->sk);
|
|
}
|
|
|
|
static u32 flow_get_proto_dst(const struct sk_buff *skb,
|
|
const struct flow_keys *flow)
|
|
{
|
|
if (flow->ports.ports)
|
|
return ntohs(flow->ports.dst);
|
|
|
|
return addr_fold(skb_dst(skb)) ^ (__force u16)skb_protocol(skb, true);
|
|
}
|
|
|
|
static u32 flow_get_iif(const struct sk_buff *skb)
|
|
{
|
|
return skb->skb_iif;
|
|
}
|
|
|
|
static u32 flow_get_priority(const struct sk_buff *skb)
|
|
{
|
|
return skb->priority;
|
|
}
|
|
|
|
static u32 flow_get_mark(const struct sk_buff *skb)
|
|
{
|
|
return skb->mark;
|
|
}
|
|
|
|
static u32 flow_get_nfct(const struct sk_buff *skb)
|
|
{
|
|
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
|
|
return addr_fold(skb_nfct(skb));
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
|
|
#define CTTUPLE(skb, member) \
|
|
({ \
|
|
enum ip_conntrack_info ctinfo; \
|
|
const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \
|
|
if (ct == NULL) \
|
|
goto fallback; \
|
|
ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \
|
|
})
|
|
#else
|
|
#define CTTUPLE(skb, member) \
|
|
({ \
|
|
goto fallback; \
|
|
0; \
|
|
})
|
|
#endif
|
|
|
|
static u32 flow_get_nfct_src(const struct sk_buff *skb,
|
|
const struct flow_keys *flow)
|
|
{
|
|
switch (skb_protocol(skb, true)) {
|
|
case htons(ETH_P_IP):
|
|
return ntohl(CTTUPLE(skb, src.u3.ip));
|
|
case htons(ETH_P_IPV6):
|
|
return ntohl(CTTUPLE(skb, src.u3.ip6[3]));
|
|
}
|
|
fallback:
|
|
return flow_get_src(skb, flow);
|
|
}
|
|
|
|
static u32 flow_get_nfct_dst(const struct sk_buff *skb,
|
|
const struct flow_keys *flow)
|
|
{
|
|
switch (skb_protocol(skb, true)) {
|
|
case htons(ETH_P_IP):
|
|
return ntohl(CTTUPLE(skb, dst.u3.ip));
|
|
case htons(ETH_P_IPV6):
|
|
return ntohl(CTTUPLE(skb, dst.u3.ip6[3]));
|
|
}
|
|
fallback:
|
|
return flow_get_dst(skb, flow);
|
|
}
|
|
|
|
static u32 flow_get_nfct_proto_src(const struct sk_buff *skb,
|
|
const struct flow_keys *flow)
|
|
{
|
|
return ntohs(CTTUPLE(skb, src.u.all));
|
|
fallback:
|
|
return flow_get_proto_src(skb, flow);
|
|
}
|
|
|
|
static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb,
|
|
const struct flow_keys *flow)
|
|
{
|
|
return ntohs(CTTUPLE(skb, dst.u.all));
|
|
fallback:
|
|
return flow_get_proto_dst(skb, flow);
|
|
}
|
|
|
|
static u32 flow_get_rtclassid(const struct sk_buff *skb)
|
|
{
|
|
#ifdef CONFIG_IP_ROUTE_CLASSID
|
|
if (skb_dst(skb))
|
|
return skb_dst(skb)->tclassid;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static u32 flow_get_skuid(const struct sk_buff *skb)
|
|
{
|
|
struct sock *sk = skb_to_full_sk(skb);
|
|
|
|
if (sk && sk->sk_socket && sk->sk_socket->file) {
|
|
kuid_t skuid = sk->sk_socket->file->f_cred->fsuid;
|
|
|
|
return from_kuid(&init_user_ns, skuid);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static u32 flow_get_skgid(const struct sk_buff *skb)
|
|
{
|
|
struct sock *sk = skb_to_full_sk(skb);
|
|
|
|
if (sk && sk->sk_socket && sk->sk_socket->file) {
|
|
kgid_t skgid = sk->sk_socket->file->f_cred->fsgid;
|
|
|
|
return from_kgid(&init_user_ns, skgid);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static u32 flow_get_vlan_tag(const struct sk_buff *skb)
|
|
{
|
|
u16 tag;
|
|
|
|
if (vlan_get_tag(skb, &tag) < 0)
|
|
return 0;
|
|
return tag & VLAN_VID_MASK;
|
|
}
|
|
|
|
static u32 flow_get_rxhash(struct sk_buff *skb)
|
|
{
|
|
return skb_get_hash(skb);
|
|
}
|
|
|
|
static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow)
|
|
{
|
|
switch (key) {
|
|
case FLOW_KEY_SRC:
|
|
return flow_get_src(skb, flow);
|
|
case FLOW_KEY_DST:
|
|
return flow_get_dst(skb, flow);
|
|
case FLOW_KEY_PROTO:
|
|
return flow_get_proto(skb, flow);
|
|
case FLOW_KEY_PROTO_SRC:
|
|
return flow_get_proto_src(skb, flow);
|
|
case FLOW_KEY_PROTO_DST:
|
|
return flow_get_proto_dst(skb, flow);
|
|
case FLOW_KEY_IIF:
|
|
return flow_get_iif(skb);
|
|
case FLOW_KEY_PRIORITY:
|
|
return flow_get_priority(skb);
|
|
case FLOW_KEY_MARK:
|
|
return flow_get_mark(skb);
|
|
case FLOW_KEY_NFCT:
|
|
return flow_get_nfct(skb);
|
|
case FLOW_KEY_NFCT_SRC:
|
|
return flow_get_nfct_src(skb, flow);
|
|
case FLOW_KEY_NFCT_DST:
|
|
return flow_get_nfct_dst(skb, flow);
|
|
case FLOW_KEY_NFCT_PROTO_SRC:
|
|
return flow_get_nfct_proto_src(skb, flow);
|
|
case FLOW_KEY_NFCT_PROTO_DST:
|
|
return flow_get_nfct_proto_dst(skb, flow);
|
|
case FLOW_KEY_RTCLASSID:
|
|
return flow_get_rtclassid(skb);
|
|
case FLOW_KEY_SKUID:
|
|
return flow_get_skuid(skb);
|
|
case FLOW_KEY_SKGID:
|
|
return flow_get_skgid(skb);
|
|
case FLOW_KEY_VLAN_TAG:
|
|
return flow_get_vlan_tag(skb);
|
|
case FLOW_KEY_RXHASH:
|
|
return flow_get_rxhash(skb);
|
|
default:
|
|
WARN_ON(1);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
#define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) | \
|
|
(1 << FLOW_KEY_DST) | \
|
|
(1 << FLOW_KEY_PROTO) | \
|
|
(1 << FLOW_KEY_PROTO_SRC) | \
|
|
(1 << FLOW_KEY_PROTO_DST) | \
|
|
(1 << FLOW_KEY_NFCT_SRC) | \
|
|
(1 << FLOW_KEY_NFCT_DST) | \
|
|
(1 << FLOW_KEY_NFCT_PROTO_SRC) | \
|
|
(1 << FLOW_KEY_NFCT_PROTO_DST))
|
|
|
|
static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp,
|
|
struct tcf_result *res)
|
|
{
|
|
struct flow_head *head = rcu_dereference_bh(tp->root);
|
|
struct flow_filter *f;
|
|
u32 keymask;
|
|
u32 classid;
|
|
unsigned int n, key;
|
|
int r;
|
|
|
|
list_for_each_entry_rcu(f, &head->filters, list) {
|
|
u32 keys[FLOW_KEY_MAX + 1];
|
|
struct flow_keys flow_keys;
|
|
|
|
if (!tcf_em_tree_match(skb, &f->ematches, NULL))
|
|
continue;
|
|
|
|
keymask = f->keymask;
|
|
if (keymask & FLOW_KEYS_NEEDED)
|
|
skb_flow_dissect_flow_keys(skb, &flow_keys, 0);
|
|
|
|
for (n = 0; n < f->nkeys; n++) {
|
|
key = ffs(keymask) - 1;
|
|
keymask &= ~(1 << key);
|
|
keys[n] = flow_key_get(skb, key, &flow_keys);
|
|
}
|
|
|
|
if (f->mode == FLOW_MODE_HASH)
|
|
classid = jhash2(keys, f->nkeys, f->hashrnd);
|
|
else {
|
|
classid = keys[0];
|
|
classid = (classid & f->mask) ^ f->xor;
|
|
classid = (classid >> f->rshift) + f->addend;
|
|
}
|
|
|
|
if (f->divisor)
|
|
classid %= f->divisor;
|
|
|
|
res->class = 0;
|
|
res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);
|
|
|
|
r = tcf_exts_exec(skb, &f->exts, res);
|
|
if (r < 0)
|
|
continue;
|
|
return r;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static void flow_perturbation(struct timer_list *t)
|
|
{
|
|
struct flow_filter *f = from_timer(f, t, perturb_timer);
|
|
|
|
get_random_bytes(&f->hashrnd, 4);
|
|
if (f->perturb_period)
|
|
mod_timer(&f->perturb_timer, jiffies + f->perturb_period);
|
|
}
|
|
|
|
static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
|
|
[TCA_FLOW_KEYS] = { .type = NLA_U32 },
|
|
[TCA_FLOW_MODE] = { .type = NLA_U32 },
|
|
[TCA_FLOW_BASECLASS] = { .type = NLA_U32 },
|
|
[TCA_FLOW_RSHIFT] = { .type = NLA_U32 },
|
|
[TCA_FLOW_ADDEND] = { .type = NLA_U32 },
|
|
[TCA_FLOW_MASK] = { .type = NLA_U32 },
|
|
[TCA_FLOW_XOR] = { .type = NLA_U32 },
|
|
[TCA_FLOW_DIVISOR] = { .type = NLA_U32 },
|
|
[TCA_FLOW_ACT] = { .type = NLA_NESTED },
|
|
[TCA_FLOW_POLICE] = { .type = NLA_NESTED },
|
|
[TCA_FLOW_EMATCHES] = { .type = NLA_NESTED },
|
|
[TCA_FLOW_PERTURB] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static void __flow_destroy_filter(struct flow_filter *f)
|
|
{
|
|
del_timer_sync(&f->perturb_timer);
|
|
tcf_exts_destroy(&f->exts);
|
|
tcf_em_tree_destroy(&f->ematches);
|
|
tcf_exts_put_net(&f->exts);
|
|
kfree(f);
|
|
}
|
|
|
|
static void flow_destroy_filter_work(struct work_struct *work)
|
|
{
|
|
struct flow_filter *f = container_of(to_rcu_work(work),
|
|
struct flow_filter,
|
|
rwork);
|
|
rtnl_lock();
|
|
__flow_destroy_filter(f);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static int flow_change(struct net *net, struct sk_buff *in_skb,
|
|
struct tcf_proto *tp, unsigned long base,
|
|
u32 handle, struct nlattr **tca,
|
|
void **arg, u32 flags,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct flow_head *head = rtnl_dereference(tp->root);
|
|
struct flow_filter *fold, *fnew;
|
|
struct nlattr *opt = tca[TCA_OPTIONS];
|
|
struct nlattr *tb[TCA_FLOW_MAX + 1];
|
|
unsigned int nkeys = 0;
|
|
unsigned int perturb_period = 0;
|
|
u32 baseclass = 0;
|
|
u32 keymask = 0;
|
|
u32 mode;
|
|
int err;
|
|
|
|
if (opt == NULL)
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested_deprecated(tb, TCA_FLOW_MAX, opt, flow_policy,
|
|
NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tb[TCA_FLOW_BASECLASS]) {
|
|
baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
|
|
if (TC_H_MIN(baseclass) == 0)
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (tb[TCA_FLOW_KEYS]) {
|
|
keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);
|
|
|
|
nkeys = hweight32(keymask);
|
|
if (nkeys == 0)
|
|
return -EINVAL;
|
|
|
|
if (fls(keymask) - 1 > FLOW_KEY_MAX)
|
|
return -EOPNOTSUPP;
|
|
|
|
if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) &&
|
|
sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
|
|
if (!fnew)
|
|
return -ENOBUFS;
|
|
|
|
err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &fnew->ematches);
|
|
if (err < 0)
|
|
goto err1;
|
|
|
|
err = tcf_exts_init(&fnew->exts, net, TCA_FLOW_ACT, TCA_FLOW_POLICE);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &fnew->exts, flags,
|
|
extack);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
fold = *arg;
|
|
if (fold) {
|
|
err = -EINVAL;
|
|
if (fold->handle != handle && handle)
|
|
goto err2;
|
|
|
|
/* Copy fold into fnew */
|
|
fnew->tp = fold->tp;
|
|
fnew->handle = fold->handle;
|
|
fnew->nkeys = fold->nkeys;
|
|
fnew->keymask = fold->keymask;
|
|
fnew->mode = fold->mode;
|
|
fnew->mask = fold->mask;
|
|
fnew->xor = fold->xor;
|
|
fnew->rshift = fold->rshift;
|
|
fnew->addend = fold->addend;
|
|
fnew->divisor = fold->divisor;
|
|
fnew->baseclass = fold->baseclass;
|
|
fnew->hashrnd = fold->hashrnd;
|
|
|
|
mode = fold->mode;
|
|
if (tb[TCA_FLOW_MODE])
|
|
mode = nla_get_u32(tb[TCA_FLOW_MODE]);
|
|
if (mode != FLOW_MODE_HASH && nkeys > 1)
|
|
goto err2;
|
|
|
|
if (mode == FLOW_MODE_HASH)
|
|
perturb_period = fold->perturb_period;
|
|
if (tb[TCA_FLOW_PERTURB]) {
|
|
if (mode != FLOW_MODE_HASH)
|
|
goto err2;
|
|
perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
|
|
}
|
|
} else {
|
|
err = -EINVAL;
|
|
if (!handle)
|
|
goto err2;
|
|
if (!tb[TCA_FLOW_KEYS])
|
|
goto err2;
|
|
|
|
mode = FLOW_MODE_MAP;
|
|
if (tb[TCA_FLOW_MODE])
|
|
mode = nla_get_u32(tb[TCA_FLOW_MODE]);
|
|
if (mode != FLOW_MODE_HASH && nkeys > 1)
|
|
goto err2;
|
|
|
|
if (tb[TCA_FLOW_PERTURB]) {
|
|
if (mode != FLOW_MODE_HASH)
|
|
goto err2;
|
|
perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
|
|
}
|
|
|
|
if (TC_H_MAJ(baseclass) == 0) {
|
|
struct Qdisc *q = tcf_block_q(tp->chain->block);
|
|
|
|
baseclass = TC_H_MAKE(q->handle, baseclass);
|
|
}
|
|
if (TC_H_MIN(baseclass) == 0)
|
|
baseclass = TC_H_MAKE(baseclass, 1);
|
|
|
|
fnew->handle = handle;
|
|
fnew->mask = ~0U;
|
|
fnew->tp = tp;
|
|
get_random_bytes(&fnew->hashrnd, 4);
|
|
}
|
|
|
|
timer_setup(&fnew->perturb_timer, flow_perturbation, TIMER_DEFERRABLE);
|
|
|
|
tcf_block_netif_keep_dst(tp->chain->block);
|
|
|
|
if (tb[TCA_FLOW_KEYS]) {
|
|
fnew->keymask = keymask;
|
|
fnew->nkeys = nkeys;
|
|
}
|
|
|
|
fnew->mode = mode;
|
|
|
|
if (tb[TCA_FLOW_MASK])
|
|
fnew->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
|
|
if (tb[TCA_FLOW_XOR])
|
|
fnew->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
|
|
if (tb[TCA_FLOW_RSHIFT])
|
|
fnew->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
|
|
if (tb[TCA_FLOW_ADDEND])
|
|
fnew->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);
|
|
|
|
if (tb[TCA_FLOW_DIVISOR])
|
|
fnew->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
|
|
if (baseclass)
|
|
fnew->baseclass = baseclass;
|
|
|
|
fnew->perturb_period = perturb_period;
|
|
if (perturb_period)
|
|
mod_timer(&fnew->perturb_timer, jiffies + perturb_period);
|
|
|
|
if (!*arg)
|
|
list_add_tail_rcu(&fnew->list, &head->filters);
|
|
else
|
|
list_replace_rcu(&fold->list, &fnew->list);
|
|
|
|
*arg = fnew;
|
|
|
|
if (fold) {
|
|
tcf_exts_get_net(&fold->exts);
|
|
tcf_queue_work(&fold->rwork, flow_destroy_filter_work);
|
|
}
|
|
return 0;
|
|
|
|
err2:
|
|
tcf_exts_destroy(&fnew->exts);
|
|
tcf_em_tree_destroy(&fnew->ematches);
|
|
err1:
|
|
kfree(fnew);
|
|
return err;
|
|
}
|
|
|
|
static int flow_delete(struct tcf_proto *tp, void *arg, bool *last,
|
|
bool rtnl_held, struct netlink_ext_ack *extack)
|
|
{
|
|
struct flow_head *head = rtnl_dereference(tp->root);
|
|
struct flow_filter *f = arg;
|
|
|
|
list_del_rcu(&f->list);
|
|
tcf_exts_get_net(&f->exts);
|
|
tcf_queue_work(&f->rwork, flow_destroy_filter_work);
|
|
*last = list_empty(&head->filters);
|
|
return 0;
|
|
}
|
|
|
|
static int flow_init(struct tcf_proto *tp)
|
|
{
|
|
struct flow_head *head;
|
|
|
|
head = kzalloc(sizeof(*head), GFP_KERNEL);
|
|
if (head == NULL)
|
|
return -ENOBUFS;
|
|
INIT_LIST_HEAD(&head->filters);
|
|
rcu_assign_pointer(tp->root, head);
|
|
return 0;
|
|
}
|
|
|
|
static void flow_destroy(struct tcf_proto *tp, bool rtnl_held,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct flow_head *head = rtnl_dereference(tp->root);
|
|
struct flow_filter *f, *next;
|
|
|
|
list_for_each_entry_safe(f, next, &head->filters, list) {
|
|
list_del_rcu(&f->list);
|
|
if (tcf_exts_get_net(&f->exts))
|
|
tcf_queue_work(&f->rwork, flow_destroy_filter_work);
|
|
else
|
|
__flow_destroy_filter(f);
|
|
}
|
|
kfree_rcu(head, rcu);
|
|
}
|
|
|
|
static void *flow_get(struct tcf_proto *tp, u32 handle)
|
|
{
|
|
struct flow_head *head = rtnl_dereference(tp->root);
|
|
struct flow_filter *f;
|
|
|
|
list_for_each_entry(f, &head->filters, list)
|
|
if (f->handle == handle)
|
|
return f;
|
|
return NULL;
|
|
}
|
|
|
|
static int flow_dump(struct net *net, struct tcf_proto *tp, void *fh,
|
|
struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
|
|
{
|
|
struct flow_filter *f = fh;
|
|
struct nlattr *nest;
|
|
|
|
if (f == NULL)
|
|
return skb->len;
|
|
|
|
t->tcm_handle = f->handle;
|
|
|
|
nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) ||
|
|
nla_put_u32(skb, TCA_FLOW_MODE, f->mode))
|
|
goto nla_put_failure;
|
|
|
|
if (f->mask != ~0 || f->xor != 0) {
|
|
if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) ||
|
|
nla_put_u32(skb, TCA_FLOW_XOR, f->xor))
|
|
goto nla_put_failure;
|
|
}
|
|
if (f->rshift &&
|
|
nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift))
|
|
goto nla_put_failure;
|
|
if (f->addend &&
|
|
nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend))
|
|
goto nla_put_failure;
|
|
|
|
if (f->divisor &&
|
|
nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor))
|
|
goto nla_put_failure;
|
|
if (f->baseclass &&
|
|
nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass))
|
|
goto nla_put_failure;
|
|
|
|
if (f->perturb_period &&
|
|
nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ))
|
|
goto nla_put_failure;
|
|
|
|
if (tcf_exts_dump(skb, &f->exts) < 0)
|
|
goto nla_put_failure;
|
|
#ifdef CONFIG_NET_EMATCH
|
|
if (f->ematches.hdr.nmatches &&
|
|
tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
|
|
goto nla_put_failure;
|
|
#endif
|
|
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 flow_walk(struct tcf_proto *tp, struct tcf_walker *arg,
|
|
bool rtnl_held)
|
|
{
|
|
struct flow_head *head = rtnl_dereference(tp->root);
|
|
struct flow_filter *f;
|
|
|
|
list_for_each_entry(f, &head->filters, list) {
|
|
if (arg->count < arg->skip)
|
|
goto skip;
|
|
if (arg->fn(tp, f, arg) < 0) {
|
|
arg->stop = 1;
|
|
break;
|
|
}
|
|
skip:
|
|
arg->count++;
|
|
}
|
|
}
|
|
|
|
static struct tcf_proto_ops cls_flow_ops __read_mostly = {
|
|
.kind = "flow",
|
|
.classify = flow_classify,
|
|
.init = flow_init,
|
|
.destroy = flow_destroy,
|
|
.change = flow_change,
|
|
.delete = flow_delete,
|
|
.get = flow_get,
|
|
.dump = flow_dump,
|
|
.walk = flow_walk,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init cls_flow_init(void)
|
|
{
|
|
return register_tcf_proto_ops(&cls_flow_ops);
|
|
}
|
|
|
|
static void __exit cls_flow_exit(void)
|
|
{
|
|
unregister_tcf_proto_ops(&cls_flow_ops);
|
|
}
|
|
|
|
module_init(cls_flow_init);
|
|
module_exit(cls_flow_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
|
|
MODULE_DESCRIPTION("TC flow classifier");
|