mirror of https://gitee.com/openkylin/linux.git
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 <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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#include <uapi/linux/netfilter/nf_nat.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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err = tcf_ct_skb_network_trim(skb, family);
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if (err)
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goto drop;
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/* 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;
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nf_ct_deliver_cached_events(ct);
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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;
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if (commit) {
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tcf_ct_act_set_mark(ct, p->mark, p->mark_mask);
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tcf_ct_act_set_labels(ct, p->labels, p->labels_mask);
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/* This will take care of sending queued events
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* even if the connection is already confirmed.
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*/
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nf_conntrack_confirm(skb);
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}
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out_push:
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skb_push_rcsum(skb, nh_ofs);
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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));
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return TC_ACT_SHOT;
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}
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|
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static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = {
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[TCA_CT_UNSPEC] = { .strict_start_type = TCA_CT_UNSPEC + 1 },
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[TCA_CT_ACTION] = { .type = NLA_U16 },
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[TCA_CT_PARMS] = { .type = NLA_EXACT_LEN, .len = sizeof(struct tc_ct) },
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[TCA_CT_ZONE] = { .type = NLA_U16 },
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[TCA_CT_MARK] = { .type = NLA_U32 },
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[TCA_CT_MARK_MASK] = { .type = NLA_U32 },
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[TCA_CT_LABELS] = { .type = NLA_BINARY,
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.len = 128 / BITS_PER_BYTE },
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[TCA_CT_LABELS_MASK] = { .type = NLA_BINARY,
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.len = 128 / BITS_PER_BYTE },
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[TCA_CT_NAT_IPV4_MIN] = { .type = NLA_U32 },
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[TCA_CT_NAT_IPV4_MAX] = { .type = NLA_U32 },
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[TCA_CT_NAT_IPV6_MIN] = { .type = NLA_EXACT_LEN,
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.len = sizeof(struct in6_addr) },
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[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(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");
|
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MODULE_LICENSE("GPL v2");
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