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linux/net/sched/act_ct.c

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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/* -
* net/sched/act_ct.c Connection Tracking action
*
* Authors: Paul Blakey <paulb@mellanox.com>
* Yossi Kuperman <yossiku@mellanox.com>
* Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
*/
#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/pkt_cls.h>
#include <net/act_api.h>
#include <net/ip.h>
#include <net/ipv6_frag.h>
#include <uapi/linux/tc_act/tc_ct.h>
#include <net/tc_act/tc_ct.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
#include <uapi/linux/netfilter/nf_nat.h>
static struct tc_action_ops act_ct_ops;
static unsigned int ct_net_id;
struct tc_ct_action_net {
struct tc_action_net tn; /* Must be first */
bool labels;
};
/* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
static bool tcf_ct_skb_nfct_cached(struct net *net, struct sk_buff *skb,
u16 zone_id, bool force)
{
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
ct = nf_ct_get(skb, &ctinfo);
if (!ct)
return false;
if (!net_eq(net, read_pnet(&ct->ct_net)))
return false;
if (nf_ct_zone(ct)->id != zone_id)
return false;
/* Force conntrack entry direction. */
if (force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
if (nf_ct_is_confirmed(ct))
nf_ct_kill(ct);
nf_conntrack_put(&ct->ct_general);
nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
return false;
}
return true;
}
/* Trim the skb to the length specified by the IP/IPv6 header,
* removing any trailing lower-layer padding. This prepares the skb
* for higher-layer processing that assumes skb->len excludes padding
* (such as nf_ip_checksum). The caller needs to pull the skb to the
* network header, and ensure ip_hdr/ipv6_hdr points to valid data.
*/
static int tcf_ct_skb_network_trim(struct sk_buff *skb, int family)
{
unsigned int len;
int err;
switch (family) {
case NFPROTO_IPV4:
len = ntohs(ip_hdr(skb)->tot_len);
break;
case NFPROTO_IPV6:
len = sizeof(struct ipv6hdr)
+ ntohs(ipv6_hdr(skb)->payload_len);
break;
default:
len = skb->len;
}
err = pskb_trim_rcsum(skb, len);
return err;
}
static u8 tcf_ct_skb_nf_family(struct sk_buff *skb)
{
u8 family = NFPROTO_UNSPEC;
switch (skb->protocol) {
case htons(ETH_P_IP):
family = NFPROTO_IPV4;
break;
case htons(ETH_P_IPV6):
family = NFPROTO_IPV6;
break;
default:
break;
}
return family;
}
static int tcf_ct_ipv4_is_fragment(struct sk_buff *skb, bool *frag)
{
unsigned int len;
len = skb_network_offset(skb) + sizeof(struct iphdr);
if (unlikely(skb->len < len))
return -EINVAL;
if (unlikely(!pskb_may_pull(skb, len)))
return -ENOMEM;
*frag = ip_is_fragment(ip_hdr(skb));
return 0;
}
static int tcf_ct_ipv6_is_fragment(struct sk_buff *skb, bool *frag)
{
unsigned int flags = 0, len, payload_ofs = 0;
unsigned short frag_off;
int nexthdr;
len = skb_network_offset(skb) + sizeof(struct ipv6hdr);
if (unlikely(skb->len < len))
return -EINVAL;
if (unlikely(!pskb_may_pull(skb, len)))
return -ENOMEM;
nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
if (unlikely(nexthdr < 0))
return -EPROTO;
*frag = flags & IP6_FH_F_FRAG;
return 0;
}
static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
u8 family, u16 zone)
{
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
int err = 0;
bool frag;
/* Previously seen (loopback)? Ignore. */
ct = nf_ct_get(skb, &ctinfo);
if ((ct && !nf_ct_is_template(ct)) || ctinfo == IP_CT_UNTRACKED)
return 0;
if (family == NFPROTO_IPV4)
err = tcf_ct_ipv4_is_fragment(skb, &frag);
else
err = tcf_ct_ipv6_is_fragment(skb, &frag);
if (err || !frag)
return err;
skb_get(skb);
if (family == NFPROTO_IPV4) {
enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
local_bh_disable();
err = ip_defrag(net, skb, user);
local_bh_enable();
if (err && err != -EINPROGRESS)
goto out_free;
} else { /* NFPROTO_IPV6 */
#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
err = nf_ct_frag6_gather(net, skb, user);
if (err && err != -EINPROGRESS)
goto out_free;
#else
err = -EOPNOTSUPP;
goto out_free;
#endif
}
skb_clear_hash(skb);
skb->ignore_df = 1;
return err;
out_free:
kfree_skb(skb);
return err;
}
static void tcf_ct_params_free(struct rcu_head *head)
{
struct tcf_ct_params *params = container_of(head,
struct tcf_ct_params, rcu);
if (params->tmpl)
nf_conntrack_put(&params->tmpl->ct_general);
kfree(params);
}
#if IS_ENABLED(CONFIG_NF_NAT)
/* Modelled after nf_nat_ipv[46]_fn().
* range is only used for new, uninitialized NAT state.
* Returns either NF_ACCEPT or NF_DROP.
*/
static int ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype)
{
int hooknum, err = NF_ACCEPT;
/* See HOOK2MANIP(). */
if (maniptype == NF_NAT_MANIP_SRC)
hooknum = NF_INET_LOCAL_IN; /* Source NAT */
else
hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */
switch (ctinfo) {
case IP_CT_RELATED:
case IP_CT_RELATED_REPLY:
if (skb->protocol == htons(ETH_P_IP) &&
ip_hdr(skb)->protocol == IPPROTO_ICMP) {
if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
hooknum))
err = NF_DROP;
goto out;
} else if (IS_ENABLED(CONFIG_IPV6) &&
skb->protocol == htons(ETH_P_IPV6)) {
__be16 frag_off;
u8 nexthdr = ipv6_hdr(skb)->nexthdr;
int hdrlen = ipv6_skip_exthdr(skb,
sizeof(struct ipv6hdr),
&nexthdr, &frag_off);
if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
if (!nf_nat_icmpv6_reply_translation(skb, ct,
ctinfo,
hooknum,
hdrlen))
err = NF_DROP;
goto out;
}
}
/* Non-ICMP, fall thru to initialize if needed. */
/* fall through */
case IP_CT_NEW:
/* Seen it before? This can happen for loopback, retrans,
* or local packets.
*/
if (!nf_nat_initialized(ct, maniptype)) {
/* Initialize according to the NAT action. */
err = (range && range->flags & NF_NAT_RANGE_MAP_IPS)
/* Action is set up to establish a new
* mapping.
*/
? nf_nat_setup_info(ct, range, maniptype)
: nf_nat_alloc_null_binding(ct, hooknum);
if (err != NF_ACCEPT)
goto out;
}
break;
case IP_CT_ESTABLISHED:
case IP_CT_ESTABLISHED_REPLY:
break;
default:
err = NF_DROP;
goto out;
}
err = nf_nat_packet(ct, ctinfo, hooknum, skb);
out:
return err;
}
#endif /* CONFIG_NF_NAT */
static void tcf_ct_act_set_mark(struct nf_conn *ct, u32 mark, u32 mask)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
u32 new_mark;
if (!mask)
return;
new_mark = mark | (ct->mark & ~(mask));
if (ct->mark != new_mark) {
ct->mark = new_mark;
if (nf_ct_is_confirmed(ct))
nf_conntrack_event_cache(IPCT_MARK, ct);
}
#endif
}
static void tcf_ct_act_set_labels(struct nf_conn *ct,
u32 *labels,
u32 *labels_m)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)
size_t labels_sz = FIELD_SIZEOF(struct tcf_ct_params, labels);
if (!memchr_inv(labels_m, 0, labels_sz))
return;
nf_connlabels_replace(ct, labels, labels_m, 4);
#endif
}
static int tcf_ct_act_nat(struct sk_buff *skb,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
int ct_action,
struct nf_nat_range2 *range,
bool commit)
{
#if IS_ENABLED(CONFIG_NF_NAT)
int err;
enum nf_nat_manip_type maniptype;
if (!(ct_action & TCA_CT_ACT_NAT))
return NF_ACCEPT;
/* Add NAT extension if not confirmed yet. */
if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct))
return NF_DROP; /* Can't NAT. */
if (ctinfo != IP_CT_NEW && (ct->status & IPS_NAT_MASK) &&
(ctinfo != IP_CT_RELATED || commit)) {
/* NAT an established or related connection like before. */
if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY)
/* This is the REPLY direction for a connection
* for which NAT was applied in the forward
* direction. Do the reverse NAT.
*/
maniptype = ct->status & IPS_SRC_NAT
? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC;
else
maniptype = ct->status & IPS_SRC_NAT
? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST;
} else if (ct_action & TCA_CT_ACT_NAT_SRC) {
maniptype = NF_NAT_MANIP_SRC;
} else if (ct_action & TCA_CT_ACT_NAT_DST) {
maniptype = NF_NAT_MANIP_DST;
} else {
return NF_ACCEPT;
}
err = ct_nat_execute(skb, ct, ctinfo, range, maniptype);
if (err == NF_ACCEPT &&
ct->status & IPS_SRC_NAT && ct->status & IPS_DST_NAT) {
if (maniptype == NF_NAT_MANIP_SRC)
maniptype = NF_NAT_MANIP_DST;
else
maniptype = NF_NAT_MANIP_SRC;
err = ct_nat_execute(skb, ct, ctinfo, range, maniptype);
}
return err;
#else
return NF_ACCEPT;
#endif
}
static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
struct tcf_result *res)
{
struct net *net = dev_net(skb->dev);
bool cached, commit, clear, force;
enum ip_conntrack_info ctinfo;
struct tcf_ct *c = to_ct(a);
struct nf_conn *tmpl = NULL;
struct nf_hook_state state;
int nh_ofs, err, retval;
struct tcf_ct_params *p;
struct nf_conn *ct;
u8 family;
p = rcu_dereference_bh(c->params);
retval = READ_ONCE(c->tcf_action);
commit = p->ct_action & TCA_CT_ACT_COMMIT;
clear = p->ct_action & TCA_CT_ACT_CLEAR;
force = p->ct_action & TCA_CT_ACT_FORCE;
tmpl = p->tmpl;
if (clear) {
ct = nf_ct_get(skb, &ctinfo);
if (ct) {
nf_conntrack_put(&ct->ct_general);
nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
}
goto out;
}
family = tcf_ct_skb_nf_family(skb);
if (family == NFPROTO_UNSPEC)
goto drop;
/* The conntrack module expects to be working at L3.
* We also try to pull the IPv4/6 header to linear area
*/
nh_ofs = skb_network_offset(skb);
skb_pull_rcsum(skb, nh_ofs);
err = tcf_ct_handle_fragments(net, skb, family, p->zone);
if (err == -EINPROGRESS) {
retval = TC_ACT_STOLEN;
goto out;
}
if (err)
goto drop;
err = tcf_ct_skb_network_trim(skb, family);
if (err)
goto drop;
/* If we are recirculating packets to match on ct fields and
* committing with a separate ct action, then we don't need to
* actually run the packet through conntrack twice unless it's for a
* different zone.
*/
cached = tcf_ct_skb_nfct_cached(net, skb, p->zone, force);
if (!cached) {
/* Associate skb with specified zone. */
if (tmpl) {
ct = nf_ct_get(skb, &ctinfo);
if (skb_nfct(skb))
nf_conntrack_put(skb_nfct(skb));
nf_conntrack_get(&tmpl->ct_general);
nf_ct_set(skb, tmpl, IP_CT_NEW);
}
state.hook = NF_INET_PRE_ROUTING;
state.net = net;
state.pf = family;
err = nf_conntrack_in(skb, &state);
if (err != NF_ACCEPT)
goto out_push;
}
ct = nf_ct_get(skb, &ctinfo);
if (!ct)
goto out_push;
nf_ct_deliver_cached_events(ct);
err = tcf_ct_act_nat(skb, ct, ctinfo, p->ct_action, &p->range, commit);
if (err != NF_ACCEPT)
goto drop;
if (commit) {
tcf_ct_act_set_mark(ct, p->mark, p->mark_mask);
tcf_ct_act_set_labels(ct, p->labels, p->labels_mask);
/* This will take care of sending queued events
* even if the connection is already confirmed.
*/
nf_conntrack_confirm(skb);
}
out_push:
skb_push_rcsum(skb, nh_ofs);
out:
tcf_action_update_bstats(&c->common, skb);
return retval;
drop:
tcf_action_inc_drop_qstats(&c->common);
return TC_ACT_SHOT;
}
static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = {
[TCA_CT_ACTION] = { .type = NLA_U16 },
[TCA_CT_PARMS] = { .type = NLA_EXACT_LEN, .len = sizeof(struct tc_ct) },
[TCA_CT_ZONE] = { .type = NLA_U16 },
[TCA_CT_MARK] = { .type = NLA_U32 },
[TCA_CT_MARK_MASK] = { .type = NLA_U32 },
[TCA_CT_LABELS] = { .type = NLA_BINARY,
.len = 128 / BITS_PER_BYTE },
[TCA_CT_LABELS_MASK] = { .type = NLA_BINARY,
.len = 128 / BITS_PER_BYTE },
[TCA_CT_NAT_IPV4_MIN] = { .type = NLA_U32 },
[TCA_CT_NAT_IPV4_MAX] = { .type = NLA_U32 },
[TCA_CT_NAT_IPV6_MIN] = { .type = NLA_EXACT_LEN,
.len = sizeof(struct in6_addr) },
[TCA_CT_NAT_IPV6_MAX] = { .type = NLA_EXACT_LEN,
.len = sizeof(struct in6_addr) },
[TCA_CT_NAT_PORT_MIN] = { .type = NLA_U16 },
[TCA_CT_NAT_PORT_MAX] = { .type = NLA_U16 },
};
static int tcf_ct_fill_params_nat(struct tcf_ct_params *p,
struct tc_ct *parm,
struct nlattr **tb,
struct netlink_ext_ack *extack)
{
struct nf_nat_range2 *range;
if (!(p->ct_action & TCA_CT_ACT_NAT))
return 0;
if (!IS_ENABLED(CONFIG_NF_NAT)) {
NL_SET_ERR_MSG_MOD(extack, "Netfilter nat isn't enabled in kernel");
return -EOPNOTSUPP;
}
if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
return 0;
if ((p->ct_action & TCA_CT_ACT_NAT_SRC) &&
(p->ct_action & TCA_CT_ACT_NAT_DST)) {
NL_SET_ERR_MSG_MOD(extack, "dnat and snat can't be enabled at the same time");
return -EOPNOTSUPP;
}
range = &p->range;
if (tb[TCA_CT_NAT_IPV4_MIN]) {
struct nlattr *max_attr = tb[TCA_CT_NAT_IPV4_MAX];
p->ipv4_range = true;
range->flags |= NF_NAT_RANGE_MAP_IPS;
range->min_addr.ip =
nla_get_in_addr(tb[TCA_CT_NAT_IPV4_MIN]);
range->max_addr.ip = max_attr ?
nla_get_in_addr(max_attr) :
range->min_addr.ip;
} else if (tb[TCA_CT_NAT_IPV6_MIN]) {
struct nlattr *max_attr = tb[TCA_CT_NAT_IPV6_MAX];
p->ipv4_range = false;
range->flags |= NF_NAT_RANGE_MAP_IPS;
range->min_addr.in6 =
nla_get_in6_addr(tb[TCA_CT_NAT_IPV6_MIN]);
range->max_addr.in6 = max_attr ?
nla_get_in6_addr(max_attr) :
range->min_addr.in6;
}
if (tb[TCA_CT_NAT_PORT_MIN]) {
range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
range->min_proto.all = nla_get_be16(tb[TCA_CT_NAT_PORT_MIN]);
range->max_proto.all = tb[TCA_CT_NAT_PORT_MAX] ?
nla_get_be16(tb[TCA_CT_NAT_PORT_MAX]) :
range->min_proto.all;
}
return 0;
}
static void tcf_ct_set_key_val(struct nlattr **tb,
void *val, int val_type,
void *mask, int mask_type,
int len)
{
if (!tb[val_type])
return;
nla_memcpy(val, tb[val_type], len);
if (!mask)
return;
if (mask_type == TCA_CT_UNSPEC || !tb[mask_type])
memset(mask, 0xff, len);
else
nla_memcpy(mask, tb[mask_type], len);
}
static int tcf_ct_fill_params(struct net *net,
struct tcf_ct_params *p,
struct tc_ct *parm,
struct nlattr **tb,
struct netlink_ext_ack *extack)
{
struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
struct nf_conntrack_zone zone;
struct nf_conn *tmpl;
int err;
p->zone = NF_CT_DEFAULT_ZONE_ID;
tcf_ct_set_key_val(tb,
&p->ct_action, TCA_CT_ACTION,
NULL, TCA_CT_UNSPEC,
sizeof(p->ct_action));
if (p->ct_action & TCA_CT_ACT_CLEAR)
return 0;
err = tcf_ct_fill_params_nat(p, parm, tb, extack);
if (err)
return err;
if (tb[TCA_CT_MARK]) {
if (!IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)) {
NL_SET_ERR_MSG_MOD(extack, "Conntrack mark isn't enabled.");
return -EOPNOTSUPP;
}
tcf_ct_set_key_val(tb,
&p->mark, TCA_CT_MARK,
&p->mark_mask, TCA_CT_MARK_MASK,
sizeof(p->mark));
}
if (tb[TCA_CT_LABELS]) {
if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) {
NL_SET_ERR_MSG_MOD(extack, "Conntrack labels isn't enabled.");
return -EOPNOTSUPP;
}
if (!tn->labels) {
NL_SET_ERR_MSG_MOD(extack, "Failed to set connlabel length");
return -EOPNOTSUPP;
}
tcf_ct_set_key_val(tb,
p->labels, TCA_CT_LABELS,
p->labels_mask, TCA_CT_LABELS_MASK,
sizeof(p->labels));
}
if (tb[TCA_CT_ZONE]) {
if (!IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)) {
NL_SET_ERR_MSG_MOD(extack, "Conntrack zones isn't enabled.");
return -EOPNOTSUPP;
}
tcf_ct_set_key_val(tb,
&p->zone, TCA_CT_ZONE,
NULL, TCA_CT_UNSPEC,
sizeof(p->zone));
}
if (p->zone == NF_CT_DEFAULT_ZONE_ID)
return 0;
nf_ct_zone_init(&zone, p->zone, NF_CT_DEFAULT_ZONE_DIR, 0);
tmpl = nf_ct_tmpl_alloc(net, &zone, GFP_KERNEL);
if (!tmpl) {
NL_SET_ERR_MSG_MOD(extack, "Failed to allocate conntrack template");
return -ENOMEM;
}
__set_bit(IPS_CONFIRMED_BIT, &tmpl->status);
nf_conntrack_get(&tmpl->ct_general);
p->tmpl = tmpl;
return 0;
}
static int tcf_ct_init(struct net *net, struct nlattr *nla,
struct nlattr *est, struct tc_action **a,
int replace, int bind, bool rtnl_held,
struct tcf_proto *tp, u32 flags,
struct netlink_ext_ack *extack)
{
struct tc_action_net *tn = net_generic(net, ct_net_id);
struct tcf_ct_params *params = NULL;
struct nlattr *tb[TCA_CT_MAX + 1];
struct tcf_chain *goto_ch = NULL;
struct tc_ct *parm;
struct tcf_ct *c;
int err, res = 0;
u32 index;
if (!nla) {
NL_SET_ERR_MSG_MOD(extack, "Ct requires attributes to be passed");
return -EINVAL;
}
err = nla_parse_nested(tb, TCA_CT_MAX, nla, ct_policy, extack);
if (err < 0)
return err;
if (!tb[TCA_CT_PARMS]) {
NL_SET_ERR_MSG_MOD(extack, "Missing required ct parameters");
return -EINVAL;
}
parm = nla_data(tb[TCA_CT_PARMS]);
index = parm->index;
err = tcf_idr_check_alloc(tn, &index, a, bind);
if (err < 0)
return err;
if (!err) {
err = tcf_idr_create_from_flags(tn, index, est, a,
&act_ct_ops, bind, flags);
if (err) {
tcf_idr_cleanup(tn, index);
return err;
}
res = ACT_P_CREATED;
} else {
if (bind)
return 0;
if (!replace) {
tcf_idr_release(*a, bind);
return -EEXIST;
}
}
err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
if (err < 0)
goto cleanup;
c = to_ct(*a);
params = kzalloc(sizeof(*params), GFP_KERNEL);
if (unlikely(!params)) {
err = -ENOMEM;
goto cleanup;
}
err = tcf_ct_fill_params(net, params, parm, tb, extack);
if (err)
goto cleanup;
spin_lock_bh(&c->tcf_lock);
goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
params = rcu_replace_pointer(c->params, params,
lockdep_is_held(&c->tcf_lock));
spin_unlock_bh(&c->tcf_lock);
if (goto_ch)
tcf_chain_put_by_act(goto_ch);
if (params)
kfree_rcu(params, rcu);
if (res == ACT_P_CREATED)
tcf_idr_insert(tn, *a);
return res;
cleanup:
if (goto_ch)
tcf_chain_put_by_act(goto_ch);
kfree(params);
tcf_idr_release(*a, bind);
return err;
}
static void tcf_ct_cleanup(struct tc_action *a)
{
struct tcf_ct_params *params;
struct tcf_ct *c = to_ct(a);
params = rcu_dereference_protected(c->params, 1);
if (params)
call_rcu(&params->rcu, tcf_ct_params_free);
}
static int tcf_ct_dump_key_val(struct sk_buff *skb,
void *val, int val_type,
void *mask, int mask_type,
int len)
{
int err;
if (mask && !memchr_inv(mask, 0, len))
return 0;
err = nla_put(skb, val_type, len, val);
if (err)
return err;
if (mask_type != TCA_CT_UNSPEC) {
err = nla_put(skb, mask_type, len, mask);
if (err)
return err;
}
return 0;
}
static int tcf_ct_dump_nat(struct sk_buff *skb, struct tcf_ct_params *p)
{
struct nf_nat_range2 *range = &p->range;
if (!(p->ct_action & TCA_CT_ACT_NAT))
return 0;
if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
return 0;
if (range->flags & NF_NAT_RANGE_MAP_IPS) {
if (p->ipv4_range) {
if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MIN,
range->min_addr.ip))
return -1;
if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MAX,
range->max_addr.ip))
return -1;
} else {
if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MIN,
&range->min_addr.in6))
return -1;
if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MAX,
&range->max_addr.in6))
return -1;
}
}
if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
if (nla_put_be16(skb, TCA_CT_NAT_PORT_MIN,
range->min_proto.all))
return -1;
if (nla_put_be16(skb, TCA_CT_NAT_PORT_MAX,
range->max_proto.all))
return -1;
}
return 0;
}
static inline int tcf_ct_dump(struct sk_buff *skb, struct tc_action *a,
int bind, int ref)
{
unsigned char *b = skb_tail_pointer(skb);
struct tcf_ct *c = to_ct(a);
struct tcf_ct_params *p;
struct tc_ct opt = {
.index = c->tcf_index,
.refcnt = refcount_read(&c->tcf_refcnt) - ref,
.bindcnt = atomic_read(&c->tcf_bindcnt) - bind,
};
struct tcf_t t;
spin_lock_bh(&c->tcf_lock);
p = rcu_dereference_protected(c->params,
lockdep_is_held(&c->tcf_lock));
opt.action = c->tcf_action;
if (tcf_ct_dump_key_val(skb,
&p->ct_action, TCA_CT_ACTION,
NULL, TCA_CT_UNSPEC,
sizeof(p->ct_action)))
goto nla_put_failure;
if (p->ct_action & TCA_CT_ACT_CLEAR)
goto skip_dump;
if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
tcf_ct_dump_key_val(skb,
&p->mark, TCA_CT_MARK,
&p->mark_mask, TCA_CT_MARK_MASK,
sizeof(p->mark)))
goto nla_put_failure;
if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
tcf_ct_dump_key_val(skb,
p->labels, TCA_CT_LABELS,
p->labels_mask, TCA_CT_LABELS_MASK,
sizeof(p->labels)))
goto nla_put_failure;
if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
tcf_ct_dump_key_val(skb,
&p->zone, TCA_CT_ZONE,
NULL, TCA_CT_UNSPEC,
sizeof(p->zone)))
goto nla_put_failure;
if (tcf_ct_dump_nat(skb, p))
goto nla_put_failure;
skip_dump:
if (nla_put(skb, TCA_CT_PARMS, sizeof(opt), &opt))
goto nla_put_failure;
tcf_tm_dump(&t, &c->tcf_tm);
if (nla_put_64bit(skb, TCA_CT_TM, sizeof(t), &t, TCA_CT_PAD))
goto nla_put_failure;
spin_unlock_bh(&c->tcf_lock);
return skb->len;
nla_put_failure:
spin_unlock_bh(&c->tcf_lock);
nlmsg_trim(skb, b);
return -1;
}
static int tcf_ct_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, ct_net_id);
return tcf_generic_walker(tn, skb, cb, type, ops, extack);
}
static int tcf_ct_search(struct net *net, struct tc_action **a, u32 index)
{
struct tc_action_net *tn = net_generic(net, ct_net_id);
return tcf_idr_search(tn, a, index);
}
static void tcf_stats_update(struct tc_action *a, u64 bytes, u32 packets,
u64 lastuse, bool hw)
{
struct tcf_ct *c = to_ct(a);
tcf_action_update_stats(a, bytes, packets, false, hw);
c->tcf_tm.lastuse = max_t(u64, c->tcf_tm.lastuse, lastuse);
}
static struct tc_action_ops act_ct_ops = {
.kind = "ct",
.id = TCA_ID_CT,
.owner = THIS_MODULE,
.act = tcf_ct_act,
.dump = tcf_ct_dump,
.init = tcf_ct_init,
.cleanup = tcf_ct_cleanup,
.walk = tcf_ct_walker,
.lookup = tcf_ct_search,
.stats_update = tcf_stats_update,
.size = sizeof(struct tcf_ct),
};
static __net_init int ct_init_net(struct net *net)
{
unsigned int n_bits = FIELD_SIZEOF(struct tcf_ct_params, labels) * 8;
struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
if (nf_connlabels_get(net, n_bits - 1)) {
tn->labels = false;
pr_err("act_ct: Failed to set connlabels length");
} else {
tn->labels = true;
}
return tc_action_net_init(net, &tn->tn, &act_ct_ops);
}
static void __net_exit ct_exit_net(struct list_head *net_list)
{
struct net *net;
rtnl_lock();
list_for_each_entry(net, net_list, exit_list) {
struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
if (tn->labels)
nf_connlabels_put(net);
}
rtnl_unlock();
tc_action_net_exit(net_list, ct_net_id);
}
static struct pernet_operations ct_net_ops = {
.init = ct_init_net,
.exit_batch = ct_exit_net,
.id = &ct_net_id,
.size = sizeof(struct tc_ct_action_net),
};
static int __init ct_init_module(void)
{
return tcf_register_action(&act_ct_ops, &ct_net_ops);
}
static void __exit ct_cleanup_module(void)
{
tcf_unregister_action(&act_ct_ops, &ct_net_ops);
}
module_init(ct_init_module);
module_exit(ct_cleanup_module);
MODULE_AUTHOR("Paul Blakey <paulb@mellanox.com>");
MODULE_AUTHOR("Yossi Kuperman <yossiku@mellanox.com>");
MODULE_AUTHOR("Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>");
MODULE_DESCRIPTION("Connection tracking action");
MODULE_LICENSE("GPL v2");
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