![Dmytro Linkin](/assets/img/avatar_default.png)
Currently init call of all actions (except ipt) init their 'parm'
structure as a direct pointer to nla data in skb. This leads to race
condition when some of the filter actions were initialized successfully
(and were assigned with idr action index that was written directly
into nla data), but then were deleted and retried (due to following
action module missing or classifier-initiated retry), in which case
action init code tries to insert action to idr with index that was
assigned on previous iteration. During retry the index can be reused
by another action that was inserted concurrently, which causes
unintended action sharing between filters.
To fix described race condition, save action idr index to temporary
stack-allocated variable instead on nla data.
Fixes: 0190c1d452
("net: sched: atomically check-allocate action")
Signed-off-by: Dmytro Linkin <dmitrolin@mellanox.com>
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
986 lines
24 KiB
C
986 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
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/* -
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* net/sched/act_ct.c Connection Tracking action
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*
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* Authors: Paul Blakey <paulb@mellanox.com>
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* Yossi Kuperman <yossiku@mellanox.com>
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* Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/pkt_cls.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/pkt_cls.h>
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#include <net/act_api.h>
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#include <net/ip.h>
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#include <net/ipv6_frag.h>
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#include <uapi/linux/tc_act/tc_ct.h>
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#include <net/tc_act/tc_ct.h>
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#include <linux/netfilter/nf_nat.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_conntrack_zones.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
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static struct tc_action_ops act_ct_ops;
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static unsigned int ct_net_id;
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struct tc_ct_action_net {
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struct tc_action_net tn; /* Must be first */
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bool labels;
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};
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/* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
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static bool tcf_ct_skb_nfct_cached(struct net *net, struct sk_buff *skb,
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u16 zone_id, bool force)
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{
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct;
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ct = nf_ct_get(skb, &ctinfo);
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if (!ct)
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return false;
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if (!net_eq(net, read_pnet(&ct->ct_net)))
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return false;
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if (nf_ct_zone(ct)->id != zone_id)
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return false;
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/* Force conntrack entry direction. */
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if (force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
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if (nf_ct_is_confirmed(ct))
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nf_ct_kill(ct);
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nf_conntrack_put(&ct->ct_general);
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nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
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return false;
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}
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return true;
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}
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/* Trim the skb to the length specified by the IP/IPv6 header,
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* removing any trailing lower-layer padding. This prepares the skb
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* for higher-layer processing that assumes skb->len excludes padding
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* (such as nf_ip_checksum). The caller needs to pull the skb to the
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* network header, and ensure ip_hdr/ipv6_hdr points to valid data.
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*/
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static int tcf_ct_skb_network_trim(struct sk_buff *skb, int family)
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{
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unsigned int len;
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int err;
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switch (family) {
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case NFPROTO_IPV4:
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len = ntohs(ip_hdr(skb)->tot_len);
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break;
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case NFPROTO_IPV6:
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len = sizeof(struct ipv6hdr)
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+ ntohs(ipv6_hdr(skb)->payload_len);
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break;
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default:
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len = skb->len;
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}
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err = pskb_trim_rcsum(skb, len);
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return err;
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}
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static u8 tcf_ct_skb_nf_family(struct sk_buff *skb)
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{
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u8 family = NFPROTO_UNSPEC;
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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family = NFPROTO_IPV4;
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break;
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case htons(ETH_P_IPV6):
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family = NFPROTO_IPV6;
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break;
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default:
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break;
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}
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return family;
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}
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static int tcf_ct_ipv4_is_fragment(struct sk_buff *skb, bool *frag)
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{
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unsigned int len;
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len = skb_network_offset(skb) + sizeof(struct iphdr);
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if (unlikely(skb->len < len))
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return -EINVAL;
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if (unlikely(!pskb_may_pull(skb, len)))
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return -ENOMEM;
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*frag = ip_is_fragment(ip_hdr(skb));
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return 0;
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}
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static int tcf_ct_ipv6_is_fragment(struct sk_buff *skb, bool *frag)
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{
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unsigned int flags = 0, len, payload_ofs = 0;
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unsigned short frag_off;
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int nexthdr;
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len = skb_network_offset(skb) + sizeof(struct ipv6hdr);
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if (unlikely(skb->len < len))
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return -EINVAL;
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if (unlikely(!pskb_may_pull(skb, len)))
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return -ENOMEM;
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nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
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if (unlikely(nexthdr < 0))
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return -EPROTO;
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*frag = flags & IP6_FH_F_FRAG;
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return 0;
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}
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static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
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u8 family, u16 zone)
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{
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct;
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int err = 0;
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bool frag;
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/* Previously seen (loopback)? Ignore. */
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ct = nf_ct_get(skb, &ctinfo);
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if ((ct && !nf_ct_is_template(ct)) || ctinfo == IP_CT_UNTRACKED)
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return 0;
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if (family == NFPROTO_IPV4)
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err = tcf_ct_ipv4_is_fragment(skb, &frag);
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else
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err = tcf_ct_ipv6_is_fragment(skb, &frag);
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if (err || !frag)
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return err;
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skb_get(skb);
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if (family == NFPROTO_IPV4) {
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enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
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memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
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local_bh_disable();
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err = ip_defrag(net, skb, user);
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local_bh_enable();
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if (err && err != -EINPROGRESS)
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goto out_free;
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} else { /* NFPROTO_IPV6 */
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#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
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enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
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memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
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err = nf_ct_frag6_gather(net, skb, user);
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if (err && err != -EINPROGRESS)
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goto out_free;
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#else
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err = -EOPNOTSUPP;
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goto out_free;
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#endif
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}
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skb_clear_hash(skb);
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skb->ignore_df = 1;
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return err;
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out_free:
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kfree_skb(skb);
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return err;
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}
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static void tcf_ct_params_free(struct rcu_head *head)
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{
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struct tcf_ct_params *params = container_of(head,
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struct tcf_ct_params, rcu);
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if (params->tmpl)
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nf_conntrack_put(¶ms->tmpl->ct_general);
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kfree(params);
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}
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#if IS_ENABLED(CONFIG_NF_NAT)
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/* Modelled after nf_nat_ipv[46]_fn().
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* range is only used for new, uninitialized NAT state.
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* Returns either NF_ACCEPT or NF_DROP.
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*/
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static int ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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const struct nf_nat_range2 *range,
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enum nf_nat_manip_type maniptype)
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{
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int hooknum, err = NF_ACCEPT;
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/* See HOOK2MANIP(). */
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if (maniptype == NF_NAT_MANIP_SRC)
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hooknum = NF_INET_LOCAL_IN; /* Source NAT */
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else
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hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */
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switch (ctinfo) {
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case IP_CT_RELATED:
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case IP_CT_RELATED_REPLY:
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if (skb->protocol == htons(ETH_P_IP) &&
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ip_hdr(skb)->protocol == IPPROTO_ICMP) {
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if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
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hooknum))
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err = NF_DROP;
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goto out;
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} else if (IS_ENABLED(CONFIG_IPV6) &&
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skb->protocol == htons(ETH_P_IPV6)) {
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__be16 frag_off;
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u8 nexthdr = ipv6_hdr(skb)->nexthdr;
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int hdrlen = ipv6_skip_exthdr(skb,
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sizeof(struct ipv6hdr),
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&nexthdr, &frag_off);
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if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
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if (!nf_nat_icmpv6_reply_translation(skb, ct,
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ctinfo,
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hooknum,
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hdrlen))
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err = NF_DROP;
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goto out;
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}
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}
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/* Non-ICMP, fall thru to initialize if needed. */
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/* fall through */
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case IP_CT_NEW:
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/* Seen it before? This can happen for loopback, retrans,
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* or local packets.
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*/
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if (!nf_nat_initialized(ct, maniptype)) {
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/* Initialize according to the NAT action. */
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err = (range && range->flags & NF_NAT_RANGE_MAP_IPS)
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/* Action is set up to establish a new
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* mapping.
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*/
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? nf_nat_setup_info(ct, range, maniptype)
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: nf_nat_alloc_null_binding(ct, hooknum);
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if (err != NF_ACCEPT)
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goto out;
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}
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break;
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case IP_CT_ESTABLISHED:
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case IP_CT_ESTABLISHED_REPLY:
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break;
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default:
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err = NF_DROP;
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goto out;
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}
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err = nf_nat_packet(ct, ctinfo, hooknum, skb);
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out:
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return err;
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}
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#endif /* CONFIG_NF_NAT */
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static void tcf_ct_act_set_mark(struct nf_conn *ct, u32 mark, u32 mask)
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{
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#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
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u32 new_mark;
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if (!mask)
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return;
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new_mark = mark | (ct->mark & ~(mask));
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if (ct->mark != new_mark) {
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ct->mark = new_mark;
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if (nf_ct_is_confirmed(ct))
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nf_conntrack_event_cache(IPCT_MARK, ct);
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}
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#endif
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}
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static void tcf_ct_act_set_labels(struct nf_conn *ct,
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u32 *labels,
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u32 *labels_m)
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{
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#if IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)
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size_t labels_sz = FIELD_SIZEOF(struct tcf_ct_params, labels);
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if (!memchr_inv(labels_m, 0, labels_sz))
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return;
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nf_connlabels_replace(ct, labels, labels_m, 4);
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#endif
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}
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static int tcf_ct_act_nat(struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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int ct_action,
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struct nf_nat_range2 *range,
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bool commit)
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{
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#if IS_ENABLED(CONFIG_NF_NAT)
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enum nf_nat_manip_type maniptype;
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if (!(ct_action & TCA_CT_ACT_NAT))
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return NF_ACCEPT;
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/* Add NAT extension if not confirmed yet. */
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if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct))
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return NF_DROP; /* Can't NAT. */
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if (ctinfo != IP_CT_NEW && (ct->status & IPS_NAT_MASK) &&
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(ctinfo != IP_CT_RELATED || commit)) {
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/* NAT an established or related connection like before. */
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if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY)
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/* This is the REPLY direction for a connection
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* for which NAT was applied in the forward
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* direction. Do the reverse NAT.
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*/
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maniptype = ct->status & IPS_SRC_NAT
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? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC;
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else
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maniptype = ct->status & IPS_SRC_NAT
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? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST;
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} else if (ct_action & TCA_CT_ACT_NAT_SRC) {
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maniptype = NF_NAT_MANIP_SRC;
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} else if (ct_action & TCA_CT_ACT_NAT_DST) {
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maniptype = NF_NAT_MANIP_DST;
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} else {
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return NF_ACCEPT;
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}
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return ct_nat_execute(skb, ct, ctinfo, range, maniptype);
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#else
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return NF_ACCEPT;
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#endif
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}
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static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
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struct tcf_result *res)
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{
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struct net *net = dev_net(skb->dev);
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bool cached, commit, clear, force;
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enum ip_conntrack_info ctinfo;
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struct tcf_ct *c = to_ct(a);
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struct nf_conn *tmpl = NULL;
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struct nf_hook_state state;
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int nh_ofs, err, retval;
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struct tcf_ct_params *p;
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struct nf_conn *ct;
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u8 family;
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p = rcu_dereference_bh(c->params);
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retval = READ_ONCE(c->tcf_action);
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commit = p->ct_action & TCA_CT_ACT_COMMIT;
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clear = p->ct_action & TCA_CT_ACT_CLEAR;
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force = p->ct_action & TCA_CT_ACT_FORCE;
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tmpl = p->tmpl;
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if (clear) {
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ct = nf_ct_get(skb, &ctinfo);
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if (ct) {
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nf_conntrack_put(&ct->ct_general);
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nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
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}
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goto out;
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}
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family = tcf_ct_skb_nf_family(skb);
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if (family == NFPROTO_UNSPEC)
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goto drop;
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/* The conntrack module expects to be working at L3.
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* We also try to pull the IPv4/6 header to linear area
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*/
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nh_ofs = skb_network_offset(skb);
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skb_pull_rcsum(skb, nh_ofs);
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err = tcf_ct_handle_fragments(net, skb, family, p->zone);
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if (err == -EINPROGRESS) {
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retval = TC_ACT_STOLEN;
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goto out;
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}
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if (err)
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goto drop;
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|
|
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err = tcf_ct_skb_network_trim(skb, family);
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if (err)
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goto drop;
|
|
|
|
/* If we are recirculating packets to match on ct fields and
|
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* committing with a separate ct action, then we don't need to
|
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* actually run the packet through conntrack twice unless it's for a
|
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* different zone.
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*/
|
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cached = tcf_ct_skb_nfct_cached(net, skb, p->zone, force);
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if (!cached) {
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/* Associate skb with specified zone. */
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if (tmpl) {
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ct = nf_ct_get(skb, &ctinfo);
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if (skb_nfct(skb))
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nf_conntrack_put(skb_nfct(skb));
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nf_conntrack_get(&tmpl->ct_general);
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nf_ct_set(skb, tmpl, IP_CT_NEW);
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}
|
|
|
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state.hook = NF_INET_PRE_ROUTING;
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state.net = net;
|
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state.pf = family;
|
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err = nf_conntrack_in(skb, &state);
|
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if (err != NF_ACCEPT)
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goto out_push;
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|
}
|
|
|
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ct = nf_ct_get(skb, &ctinfo);
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|
if (!ct)
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goto out_push;
|
|
nf_ct_deliver_cached_events(ct);
|
|
|
|
err = tcf_ct_act_nat(skb, ct, ctinfo, p->ct_action, &p->range, commit);
|
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if (err != NF_ACCEPT)
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|
goto drop;
|
|
|
|
if (commit) {
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|
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.
|
|
*/
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|
nf_conntrack_confirm(skb);
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}
|
|
|
|
out_push:
|
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skb_push_rcsum(skb, nh_ofs);
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|
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out:
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bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), skb);
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return retval;
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|
|
drop:
|
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qstats_drop_inc(this_cpu_ptr(a->cpu_qstats));
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = {
|
|
[TCA_CT_UNSPEC] = { .strict_start_type = TCA_CT_UNSPEC + 1 },
|
|
[TCA_CT_ACTION] = { .type = NLA_U16 },
|
|
[TCA_CT_PARMS] = { .type = NLA_EXACT_LEN, .len = sizeof(struct tc_ct) },
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|
[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,
|
|
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(tn, index, est, a,
|
|
&act_ct_ops, bind, true);
|
|
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);
|
|
rcu_swap_protected(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(¶ms->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);
|
|
|
|
_bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
|
|
|
|
if (hw)
|
|
_bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
|
|
bytes, packets);
|
|
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(&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),
|
|
};
|
|
|
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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");
|
|
|