mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
07d79fc7d9
TC filters when used as classifiers are bound to TC classes. However, there is a hidden difference when adding them in different orders: 1. If we add tc classes before its filters, everything is fine. Logically, the classes exist before we specify their ID's in filters, it is easy to bind them together, just as in the current code base. 2. If we add tc filters before the tc classes they bind, we have to do dynamic lookup in fast path. What's worse, this happens all the time not just once, because on fast path tcf_result is passed on stack, there is no way to propagate back to the one in tc filters. This hidden difference hurts performance silently if we have many tc classes in hierarchy. This patch intends to close this gap by doing the reverse binding when we create a new class, in this case we can actually search all the filters in its parent, match and fixup by classid. And because tcf_result is specific to each type of tc filter, we have to introduce a new ops for each filter to tell how to bind the class. Note, we still can NOT totally get rid of those class lookup in ->enqueue() because cgroup and flow filters have no way to determine the classid at setup time, they still have to go through dynamic lookup. Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
661 lines
14 KiB
C
661 lines
14 KiB
C
/*
|
|
* Berkeley Packet Filter based traffic classifier
|
|
*
|
|
* Might be used to classify traffic through flexible, user-defined and
|
|
* possibly JIT-ed BPF filters for traffic control as an alternative to
|
|
* ematches.
|
|
*
|
|
* (C) 2013 Daniel Borkmann <dborkman@redhat.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/filter.h>
|
|
#include <linux/bpf.h>
|
|
|
|
#include <net/rtnetlink.h>
|
|
#include <net/pkt_cls.h>
|
|
#include <net/sock.h>
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>");
|
|
MODULE_DESCRIPTION("TC BPF based classifier");
|
|
|
|
#define CLS_BPF_NAME_LEN 256
|
|
#define CLS_BPF_SUPPORTED_GEN_FLAGS \
|
|
(TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)
|
|
|
|
struct cls_bpf_head {
|
|
struct list_head plist;
|
|
u32 hgen;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
struct cls_bpf_prog {
|
|
struct bpf_prog *filter;
|
|
struct list_head link;
|
|
struct tcf_result res;
|
|
bool exts_integrated;
|
|
bool offloaded;
|
|
u32 gen_flags;
|
|
struct tcf_exts exts;
|
|
u32 handle;
|
|
u16 bpf_num_ops;
|
|
struct sock_filter *bpf_ops;
|
|
const char *bpf_name;
|
|
struct tcf_proto *tp;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = {
|
|
[TCA_BPF_CLASSID] = { .type = NLA_U32 },
|
|
[TCA_BPF_FLAGS] = { .type = NLA_U32 },
|
|
[TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 },
|
|
[TCA_BPF_FD] = { .type = NLA_U32 },
|
|
[TCA_BPF_NAME] = { .type = NLA_NUL_STRING,
|
|
.len = CLS_BPF_NAME_LEN },
|
|
[TCA_BPF_OPS_LEN] = { .type = NLA_U16 },
|
|
[TCA_BPF_OPS] = { .type = NLA_BINARY,
|
|
.len = sizeof(struct sock_filter) * BPF_MAXINSNS },
|
|
};
|
|
|
|
static int cls_bpf_exec_opcode(int code)
|
|
{
|
|
switch (code) {
|
|
case TC_ACT_OK:
|
|
case TC_ACT_SHOT:
|
|
case TC_ACT_STOLEN:
|
|
case TC_ACT_TRAP:
|
|
case TC_ACT_REDIRECT:
|
|
case TC_ACT_UNSPEC:
|
|
return code;
|
|
default:
|
|
return TC_ACT_UNSPEC;
|
|
}
|
|
}
|
|
|
|
static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
|
|
struct tcf_result *res)
|
|
{
|
|
struct cls_bpf_head *head = rcu_dereference_bh(tp->root);
|
|
bool at_ingress = skb_at_tc_ingress(skb);
|
|
struct cls_bpf_prog *prog;
|
|
int ret = -1;
|
|
|
|
/* Needed here for accessing maps. */
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(prog, &head->plist, link) {
|
|
int filter_res;
|
|
|
|
qdisc_skb_cb(skb)->tc_classid = prog->res.classid;
|
|
|
|
if (tc_skip_sw(prog->gen_flags)) {
|
|
filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0;
|
|
} else if (at_ingress) {
|
|
/* It is safe to push/pull even if skb_shared() */
|
|
__skb_push(skb, skb->mac_len);
|
|
bpf_compute_data_end(skb);
|
|
filter_res = BPF_PROG_RUN(prog->filter, skb);
|
|
__skb_pull(skb, skb->mac_len);
|
|
} else {
|
|
bpf_compute_data_end(skb);
|
|
filter_res = BPF_PROG_RUN(prog->filter, skb);
|
|
}
|
|
|
|
if (prog->exts_integrated) {
|
|
res->class = 0;
|
|
res->classid = TC_H_MAJ(prog->res.classid) |
|
|
qdisc_skb_cb(skb)->tc_classid;
|
|
|
|
ret = cls_bpf_exec_opcode(filter_res);
|
|
if (ret == TC_ACT_UNSPEC)
|
|
continue;
|
|
break;
|
|
}
|
|
|
|
if (filter_res == 0)
|
|
continue;
|
|
if (filter_res != -1) {
|
|
res->class = 0;
|
|
res->classid = filter_res;
|
|
} else {
|
|
*res = prog->res;
|
|
}
|
|
|
|
ret = tcf_exts_exec(skb, &prog->exts, res);
|
|
if (ret < 0)
|
|
continue;
|
|
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog)
|
|
{
|
|
return !prog->bpf_ops;
|
|
}
|
|
|
|
static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog,
|
|
enum tc_clsbpf_command cmd)
|
|
{
|
|
struct net_device *dev = tp->q->dev_queue->dev;
|
|
struct tc_cls_bpf_offload cls_bpf = {};
|
|
int err;
|
|
|
|
tc_cls_common_offload_init(&cls_bpf.common, tp);
|
|
cls_bpf.command = cmd;
|
|
cls_bpf.exts = &prog->exts;
|
|
cls_bpf.prog = prog->filter;
|
|
cls_bpf.name = prog->bpf_name;
|
|
cls_bpf.exts_integrated = prog->exts_integrated;
|
|
cls_bpf.gen_flags = prog->gen_flags;
|
|
|
|
err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSBPF, &cls_bpf);
|
|
if (!err && (cmd == TC_CLSBPF_ADD || cmd == TC_CLSBPF_REPLACE))
|
|
prog->gen_flags |= TCA_CLS_FLAGS_IN_HW;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog,
|
|
struct cls_bpf_prog *oldprog)
|
|
{
|
|
struct net_device *dev = tp->q->dev_queue->dev;
|
|
struct cls_bpf_prog *obj = prog;
|
|
enum tc_clsbpf_command cmd;
|
|
bool skip_sw;
|
|
int ret;
|
|
|
|
skip_sw = tc_skip_sw(prog->gen_flags) ||
|
|
(oldprog && tc_skip_sw(oldprog->gen_flags));
|
|
|
|
if (oldprog && oldprog->offloaded) {
|
|
if (tc_should_offload(dev, prog->gen_flags)) {
|
|
cmd = TC_CLSBPF_REPLACE;
|
|
} else if (!tc_skip_sw(prog->gen_flags)) {
|
|
obj = oldprog;
|
|
cmd = TC_CLSBPF_DESTROY;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
if (!tc_should_offload(dev, prog->gen_flags))
|
|
return skip_sw ? -EINVAL : 0;
|
|
cmd = TC_CLSBPF_ADD;
|
|
}
|
|
|
|
ret = cls_bpf_offload_cmd(tp, obj, cmd);
|
|
if (ret)
|
|
return skip_sw ? ret : 0;
|
|
|
|
obj->offloaded = true;
|
|
if (oldprog)
|
|
oldprog->offloaded = false;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void cls_bpf_stop_offload(struct tcf_proto *tp,
|
|
struct cls_bpf_prog *prog)
|
|
{
|
|
int err;
|
|
|
|
if (!prog->offloaded)
|
|
return;
|
|
|
|
err = cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_DESTROY);
|
|
if (err) {
|
|
pr_err("Stopping hardware offload failed: %d\n", err);
|
|
return;
|
|
}
|
|
|
|
prog->offloaded = false;
|
|
}
|
|
|
|
static void cls_bpf_offload_update_stats(struct tcf_proto *tp,
|
|
struct cls_bpf_prog *prog)
|
|
{
|
|
if (!prog->offloaded)
|
|
return;
|
|
|
|
cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_STATS);
|
|
}
|
|
|
|
static int cls_bpf_init(struct tcf_proto *tp)
|
|
{
|
|
struct cls_bpf_head *head;
|
|
|
|
head = kzalloc(sizeof(*head), GFP_KERNEL);
|
|
if (head == NULL)
|
|
return -ENOBUFS;
|
|
|
|
INIT_LIST_HEAD_RCU(&head->plist);
|
|
rcu_assign_pointer(tp->root, head);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog)
|
|
{
|
|
tcf_exts_destroy(&prog->exts);
|
|
|
|
if (cls_bpf_is_ebpf(prog))
|
|
bpf_prog_put(prog->filter);
|
|
else
|
|
bpf_prog_destroy(prog->filter);
|
|
|
|
kfree(prog->bpf_name);
|
|
kfree(prog->bpf_ops);
|
|
kfree(prog);
|
|
}
|
|
|
|
static void cls_bpf_delete_prog_rcu(struct rcu_head *rcu)
|
|
{
|
|
__cls_bpf_delete_prog(container_of(rcu, struct cls_bpf_prog, rcu));
|
|
}
|
|
|
|
static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog)
|
|
{
|
|
cls_bpf_stop_offload(tp, prog);
|
|
list_del_rcu(&prog->link);
|
|
tcf_unbind_filter(tp, &prog->res);
|
|
call_rcu(&prog->rcu, cls_bpf_delete_prog_rcu);
|
|
}
|
|
|
|
static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last)
|
|
{
|
|
struct cls_bpf_head *head = rtnl_dereference(tp->root);
|
|
|
|
__cls_bpf_delete(tp, arg);
|
|
*last = list_empty(&head->plist);
|
|
return 0;
|
|
}
|
|
|
|
static void cls_bpf_destroy(struct tcf_proto *tp)
|
|
{
|
|
struct cls_bpf_head *head = rtnl_dereference(tp->root);
|
|
struct cls_bpf_prog *prog, *tmp;
|
|
|
|
list_for_each_entry_safe(prog, tmp, &head->plist, link)
|
|
__cls_bpf_delete(tp, prog);
|
|
|
|
kfree_rcu(head, rcu);
|
|
}
|
|
|
|
static void *cls_bpf_get(struct tcf_proto *tp, u32 handle)
|
|
{
|
|
struct cls_bpf_head *head = rtnl_dereference(tp->root);
|
|
struct cls_bpf_prog *prog;
|
|
|
|
list_for_each_entry(prog, &head->plist, link) {
|
|
if (prog->handle == handle)
|
|
return prog;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog)
|
|
{
|
|
struct sock_filter *bpf_ops;
|
|
struct sock_fprog_kern fprog_tmp;
|
|
struct bpf_prog *fp;
|
|
u16 bpf_size, bpf_num_ops;
|
|
int ret;
|
|
|
|
bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]);
|
|
if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0)
|
|
return -EINVAL;
|
|
|
|
bpf_size = bpf_num_ops * sizeof(*bpf_ops);
|
|
if (bpf_size != nla_len(tb[TCA_BPF_OPS]))
|
|
return -EINVAL;
|
|
|
|
bpf_ops = kzalloc(bpf_size, GFP_KERNEL);
|
|
if (bpf_ops == NULL)
|
|
return -ENOMEM;
|
|
|
|
memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size);
|
|
|
|
fprog_tmp.len = bpf_num_ops;
|
|
fprog_tmp.filter = bpf_ops;
|
|
|
|
ret = bpf_prog_create(&fp, &fprog_tmp);
|
|
if (ret < 0) {
|
|
kfree(bpf_ops);
|
|
return ret;
|
|
}
|
|
|
|
prog->bpf_ops = bpf_ops;
|
|
prog->bpf_num_ops = bpf_num_ops;
|
|
prog->bpf_name = NULL;
|
|
prog->filter = fp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog,
|
|
const struct tcf_proto *tp)
|
|
{
|
|
struct bpf_prog *fp;
|
|
char *name = NULL;
|
|
u32 bpf_fd;
|
|
|
|
bpf_fd = nla_get_u32(tb[TCA_BPF_FD]);
|
|
|
|
fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_CLS);
|
|
if (IS_ERR(fp))
|
|
return PTR_ERR(fp);
|
|
|
|
if (tb[TCA_BPF_NAME]) {
|
|
name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL);
|
|
if (!name) {
|
|
bpf_prog_put(fp);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
prog->bpf_ops = NULL;
|
|
prog->bpf_name = name;
|
|
prog->filter = fp;
|
|
|
|
if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS))
|
|
netif_keep_dst(qdisc_dev(tp->q));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp,
|
|
struct cls_bpf_prog *prog, unsigned long base,
|
|
struct nlattr **tb, struct nlattr *est, bool ovr)
|
|
{
|
|
bool is_bpf, is_ebpf, have_exts = false;
|
|
u32 gen_flags = 0;
|
|
int ret;
|
|
|
|
is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS];
|
|
is_ebpf = tb[TCA_BPF_FD];
|
|
if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf))
|
|
return -EINVAL;
|
|
|
|
ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (tb[TCA_BPF_FLAGS]) {
|
|
u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]);
|
|
|
|
if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT)
|
|
return -EINVAL;
|
|
|
|
have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT;
|
|
}
|
|
if (tb[TCA_BPF_FLAGS_GEN]) {
|
|
gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]);
|
|
if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS ||
|
|
!tc_flags_valid(gen_flags))
|
|
return -EINVAL;
|
|
}
|
|
|
|
prog->exts_integrated = have_exts;
|
|
prog->gen_flags = gen_flags;
|
|
|
|
ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) :
|
|
cls_bpf_prog_from_efd(tb, prog, tp);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (tb[TCA_BPF_CLASSID]) {
|
|
prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
|
|
tcf_bind_filter(tp, &prog->res, base);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp,
|
|
struct cls_bpf_head *head)
|
|
{
|
|
unsigned int i = 0x80000000;
|
|
u32 handle;
|
|
|
|
do {
|
|
if (++head->hgen == 0x7FFFFFFF)
|
|
head->hgen = 1;
|
|
} while (--i > 0 && cls_bpf_get(tp, head->hgen));
|
|
|
|
if (unlikely(i == 0)) {
|
|
pr_err("Insufficient number of handles\n");
|
|
handle = 0;
|
|
} else {
|
|
handle = head->hgen;
|
|
}
|
|
|
|
return handle;
|
|
}
|
|
|
|
static int cls_bpf_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 cls_bpf_head *head = rtnl_dereference(tp->root);
|
|
struct cls_bpf_prog *oldprog = *arg;
|
|
struct nlattr *tb[TCA_BPF_MAX + 1];
|
|
struct cls_bpf_prog *prog;
|
|
int ret;
|
|
|
|
if (tca[TCA_OPTIONS] == NULL)
|
|
return -EINVAL;
|
|
|
|
ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy,
|
|
NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
prog = kzalloc(sizeof(*prog), GFP_KERNEL);
|
|
if (!prog)
|
|
return -ENOBUFS;
|
|
|
|
ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE);
|
|
if (ret < 0)
|
|
goto errout;
|
|
|
|
if (oldprog) {
|
|
if (handle && oldprog->handle != handle) {
|
|
ret = -EINVAL;
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
if (handle == 0)
|
|
prog->handle = cls_bpf_grab_new_handle(tp, head);
|
|
else
|
|
prog->handle = handle;
|
|
if (prog->handle == 0) {
|
|
ret = -EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr);
|
|
if (ret < 0)
|
|
goto errout;
|
|
|
|
ret = cls_bpf_offload(tp, prog, oldprog);
|
|
if (ret) {
|
|
__cls_bpf_delete_prog(prog);
|
|
return ret;
|
|
}
|
|
|
|
if (!tc_in_hw(prog->gen_flags))
|
|
prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW;
|
|
|
|
if (oldprog) {
|
|
list_replace_rcu(&oldprog->link, &prog->link);
|
|
tcf_unbind_filter(tp, &oldprog->res);
|
|
call_rcu(&oldprog->rcu, cls_bpf_delete_prog_rcu);
|
|
} else {
|
|
list_add_rcu(&prog->link, &head->plist);
|
|
}
|
|
|
|
*arg = prog;
|
|
return 0;
|
|
|
|
errout:
|
|
tcf_exts_destroy(&prog->exts);
|
|
kfree(prog);
|
|
return ret;
|
|
}
|
|
|
|
static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct nlattr *nla;
|
|
|
|
if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops))
|
|
return -EMSGSIZE;
|
|
|
|
nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops *
|
|
sizeof(struct sock_filter));
|
|
if (nla == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct nlattr *nla;
|
|
|
|
if (prog->bpf_name &&
|
|
nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name))
|
|
return -EMSGSIZE;
|
|
|
|
if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id))
|
|
return -EMSGSIZE;
|
|
|
|
nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag));
|
|
if (nla == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
memcpy(nla_data(nla), prog->filter->tag, nla_len(nla));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh,
|
|
struct sk_buff *skb, struct tcmsg *tm)
|
|
{
|
|
struct cls_bpf_prog *prog = fh;
|
|
struct nlattr *nest;
|
|
u32 bpf_flags = 0;
|
|
int ret;
|
|
|
|
if (prog == NULL)
|
|
return skb->len;
|
|
|
|
tm->tcm_handle = prog->handle;
|
|
|
|
cls_bpf_offload_update_stats(tp, prog);
|
|
|
|
nest = nla_nest_start(skb, TCA_OPTIONS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (prog->res.classid &&
|
|
nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid))
|
|
goto nla_put_failure;
|
|
|
|
if (cls_bpf_is_ebpf(prog))
|
|
ret = cls_bpf_dump_ebpf_info(prog, skb);
|
|
else
|
|
ret = cls_bpf_dump_bpf_info(prog, skb);
|
|
if (ret)
|
|
goto nla_put_failure;
|
|
|
|
if (tcf_exts_dump(skb, &prog->exts) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (prog->exts_integrated)
|
|
bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT;
|
|
if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags))
|
|
goto nla_put_failure;
|
|
if (prog->gen_flags &&
|
|
nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags))
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
|
|
if (tcf_exts_dump_stats(skb, &prog->exts) < 0)
|
|
goto nla_put_failure;
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, nest);
|
|
return -1;
|
|
}
|
|
|
|
static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl)
|
|
{
|
|
struct cls_bpf_prog *prog = fh;
|
|
|
|
if (prog && prog->res.classid == classid)
|
|
prog->res.class = cl;
|
|
}
|
|
|
|
static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg)
|
|
{
|
|
struct cls_bpf_head *head = rtnl_dereference(tp->root);
|
|
struct cls_bpf_prog *prog;
|
|
|
|
list_for_each_entry(prog, &head->plist, link) {
|
|
if (arg->count < arg->skip)
|
|
goto skip;
|
|
if (arg->fn(tp, prog, arg) < 0) {
|
|
arg->stop = 1;
|
|
break;
|
|
}
|
|
skip:
|
|
arg->count++;
|
|
}
|
|
}
|
|
|
|
static struct tcf_proto_ops cls_bpf_ops __read_mostly = {
|
|
.kind = "bpf",
|
|
.owner = THIS_MODULE,
|
|
.classify = cls_bpf_classify,
|
|
.init = cls_bpf_init,
|
|
.destroy = cls_bpf_destroy,
|
|
.get = cls_bpf_get,
|
|
.change = cls_bpf_change,
|
|
.delete = cls_bpf_delete,
|
|
.walk = cls_bpf_walk,
|
|
.dump = cls_bpf_dump,
|
|
.bind_class = cls_bpf_bind_class,
|
|
};
|
|
|
|
static int __init cls_bpf_init_mod(void)
|
|
{
|
|
return register_tcf_proto_ops(&cls_bpf_ops);
|
|
}
|
|
|
|
static void __exit cls_bpf_exit_mod(void)
|
|
{
|
|
unregister_tcf_proto_ops(&cls_bpf_ops);
|
|
}
|
|
|
|
module_init(cls_bpf_init_mod);
|
|
module_exit(cls_bpf_exit_mod);
|