mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
265 lines
6.5 KiB
265 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* net/sched/act_connmark.c netfilter connmark retriever action |
|
* skb mark is over-written |
|
* |
|
* Copyright (c) 2011 Felix Fietkau <[email protected]> |
|
*/ |
|
|
|
#include <linux/module.h> |
|
#include <linux/init.h> |
|
#include <linux/kernel.h> |
|
#include <linux/skbuff.h> |
|
#include <linux/rtnetlink.h> |
|
#include <linux/pkt_cls.h> |
|
#include <linux/ip.h> |
|
#include <linux/ipv6.h> |
|
#include <net/netlink.h> |
|
#include <net/pkt_sched.h> |
|
#include <net/act_api.h> |
|
#include <net/pkt_cls.h> |
|
#include <uapi/linux/tc_act/tc_connmark.h> |
|
#include <net/tc_act/tc_connmark.h> |
|
|
|
#include <net/netfilter/nf_conntrack.h> |
|
#include <net/netfilter/nf_conntrack_core.h> |
|
#include <net/netfilter/nf_conntrack_zones.h> |
|
|
|
static unsigned int connmark_net_id; |
|
static struct tc_action_ops act_connmark_ops; |
|
|
|
static int tcf_connmark_act(struct sk_buff *skb, const struct tc_action *a, |
|
struct tcf_result *res) |
|
{ |
|
const struct nf_conntrack_tuple_hash *thash; |
|
struct nf_conntrack_tuple tuple; |
|
enum ip_conntrack_info ctinfo; |
|
struct tcf_connmark_info *ca = to_connmark(a); |
|
struct nf_conntrack_zone zone; |
|
struct nf_conn *c; |
|
int proto; |
|
|
|
spin_lock(&ca->tcf_lock); |
|
tcf_lastuse_update(&ca->tcf_tm); |
|
bstats_update(&ca->tcf_bstats, skb); |
|
|
|
switch (skb_protocol(skb, true)) { |
|
case htons(ETH_P_IP): |
|
if (skb->len < sizeof(struct iphdr)) |
|
goto out; |
|
|
|
proto = NFPROTO_IPV4; |
|
break; |
|
case htons(ETH_P_IPV6): |
|
if (skb->len < sizeof(struct ipv6hdr)) |
|
goto out; |
|
|
|
proto = NFPROTO_IPV6; |
|
break; |
|
default: |
|
goto out; |
|
} |
|
|
|
c = nf_ct_get(skb, &ctinfo); |
|
if (c) { |
|
skb->mark = c->mark; |
|
/* using overlimits stats to count how many packets marked */ |
|
ca->tcf_qstats.overlimits++; |
|
goto out; |
|
} |
|
|
|
if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), |
|
proto, ca->net, &tuple)) |
|
goto out; |
|
|
|
zone.id = ca->zone; |
|
zone.dir = NF_CT_DEFAULT_ZONE_DIR; |
|
|
|
thash = nf_conntrack_find_get(ca->net, &zone, &tuple); |
|
if (!thash) |
|
goto out; |
|
|
|
c = nf_ct_tuplehash_to_ctrack(thash); |
|
/* using overlimits stats to count how many packets marked */ |
|
ca->tcf_qstats.overlimits++; |
|
skb->mark = c->mark; |
|
nf_ct_put(c); |
|
|
|
out: |
|
spin_unlock(&ca->tcf_lock); |
|
return ca->tcf_action; |
|
} |
|
|
|
static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = { |
|
[TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) }, |
|
}; |
|
|
|
static int tcf_connmark_init(struct net *net, struct nlattr *nla, |
|
struct nlattr *est, struct tc_action **a, |
|
int ovr, int bind, bool rtnl_held, |
|
struct tcf_proto *tp, u32 flags, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct tc_action_net *tn = net_generic(net, connmark_net_id); |
|
struct nlattr *tb[TCA_CONNMARK_MAX + 1]; |
|
struct tcf_chain *goto_ch = NULL; |
|
struct tcf_connmark_info *ci; |
|
struct tc_connmark *parm; |
|
int ret = 0, err; |
|
u32 index; |
|
|
|
if (!nla) |
|
return -EINVAL; |
|
|
|
ret = nla_parse_nested_deprecated(tb, TCA_CONNMARK_MAX, nla, |
|
connmark_policy, NULL); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (!tb[TCA_CONNMARK_PARMS]) |
|
return -EINVAL; |
|
|
|
parm = nla_data(tb[TCA_CONNMARK_PARMS]); |
|
index = parm->index; |
|
ret = tcf_idr_check_alloc(tn, &index, a, bind); |
|
if (!ret) { |
|
ret = tcf_idr_create(tn, index, est, a, |
|
&act_connmark_ops, bind, false, 0); |
|
if (ret) { |
|
tcf_idr_cleanup(tn, index); |
|
return ret; |
|
} |
|
|
|
ci = to_connmark(*a); |
|
err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, |
|
extack); |
|
if (err < 0) |
|
goto release_idr; |
|
tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
|
ci->net = net; |
|
ci->zone = parm->zone; |
|
|
|
ret = ACT_P_CREATED; |
|
} else if (ret > 0) { |
|
ci = to_connmark(*a); |
|
if (bind) |
|
return 0; |
|
if (!ovr) { |
|
tcf_idr_release(*a, bind); |
|
return -EEXIST; |
|
} |
|
err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, |
|
extack); |
|
if (err < 0) |
|
goto release_idr; |
|
/* replacing action and zone */ |
|
spin_lock_bh(&ci->tcf_lock); |
|
goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
|
ci->zone = parm->zone; |
|
spin_unlock_bh(&ci->tcf_lock); |
|
if (goto_ch) |
|
tcf_chain_put_by_act(goto_ch); |
|
ret = 0; |
|
} |
|
|
|
return ret; |
|
release_idr: |
|
tcf_idr_release(*a, bind); |
|
return err; |
|
} |
|
|
|
static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a, |
|
int bind, int ref) |
|
{ |
|
unsigned char *b = skb_tail_pointer(skb); |
|
struct tcf_connmark_info *ci = to_connmark(a); |
|
struct tc_connmark opt = { |
|
.index = ci->tcf_index, |
|
.refcnt = refcount_read(&ci->tcf_refcnt) - ref, |
|
.bindcnt = atomic_read(&ci->tcf_bindcnt) - bind, |
|
}; |
|
struct tcf_t t; |
|
|
|
spin_lock_bh(&ci->tcf_lock); |
|
opt.action = ci->tcf_action; |
|
opt.zone = ci->zone; |
|
if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt)) |
|
goto nla_put_failure; |
|
|
|
tcf_tm_dump(&t, &ci->tcf_tm); |
|
if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t, |
|
TCA_CONNMARK_PAD)) |
|
goto nla_put_failure; |
|
spin_unlock_bh(&ci->tcf_lock); |
|
|
|
return skb->len; |
|
|
|
nla_put_failure: |
|
spin_unlock_bh(&ci->tcf_lock); |
|
nlmsg_trim(skb, b); |
|
return -1; |
|
} |
|
|
|
static int tcf_connmark_walker(struct net *net, struct sk_buff *skb, |
|
struct netlink_callback *cb, int type, |
|
const struct tc_action_ops *ops, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct tc_action_net *tn = net_generic(net, connmark_net_id); |
|
|
|
return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
|
} |
|
|
|
static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index) |
|
{ |
|
struct tc_action_net *tn = net_generic(net, connmark_net_id); |
|
|
|
return tcf_idr_search(tn, a, index); |
|
} |
|
|
|
static struct tc_action_ops act_connmark_ops = { |
|
.kind = "connmark", |
|
.id = TCA_ID_CONNMARK, |
|
.owner = THIS_MODULE, |
|
.act = tcf_connmark_act, |
|
.dump = tcf_connmark_dump, |
|
.init = tcf_connmark_init, |
|
.walk = tcf_connmark_walker, |
|
.lookup = tcf_connmark_search, |
|
.size = sizeof(struct tcf_connmark_info), |
|
}; |
|
|
|
static __net_init int connmark_init_net(struct net *net) |
|
{ |
|
struct tc_action_net *tn = net_generic(net, connmark_net_id); |
|
|
|
return tc_action_net_init(net, tn, &act_connmark_ops); |
|
} |
|
|
|
static void __net_exit connmark_exit_net(struct list_head *net_list) |
|
{ |
|
tc_action_net_exit(net_list, connmark_net_id); |
|
} |
|
|
|
static struct pernet_operations connmark_net_ops = { |
|
.init = connmark_init_net, |
|
.exit_batch = connmark_exit_net, |
|
.id = &connmark_net_id, |
|
.size = sizeof(struct tc_action_net), |
|
}; |
|
|
|
static int __init connmark_init_module(void) |
|
{ |
|
return tcf_register_action(&act_connmark_ops, &connmark_net_ops); |
|
} |
|
|
|
static void __exit connmark_cleanup_module(void) |
|
{ |
|
tcf_unregister_action(&act_connmark_ops, &connmark_net_ops); |
|
} |
|
|
|
module_init(connmark_init_module); |
|
module_exit(connmark_cleanup_module); |
|
MODULE_AUTHOR("Felix Fietkau <[email protected]>"); |
|
MODULE_DESCRIPTION("Connection tracking mark restoring"); |
|
MODULE_LICENSE("GPL");
|
|
|