Hello,
On Thu, Aug 2, 2018 at 9:28 AM, Harsha Sharma
<[email protected]> wrote:
> This patch allows to add, list and delete connection tracking timeout
> policies via nft objref infrastructure and assigning these timeout
> via nft rule.
>
> %./libnftnl/examples/nft-ct-timeout-add ip raw cttime tcp
>
> Ruleset:
>
> table ip raw {
> ct timeout cttime {
> protocol tcp
> established 111 close 13
> l3proto ip
> }
>
> chain output {
> type filter hook output priority -300; policy accept;
> ct timeout set "cttime"
> }
> }
>
> %./libnftnl/examples/nft-rule-ct-timeout-add ip raw output cttime
>
> %conntrack -E
> [NEW] tcp 6 111 ESTABLISHED src=172.16.19.128 dst=172.16.19.1
> sport=22 dport=41360 [UNREPLIED] src=172.16.19.1 dst=172.16.19.128
> sport=41360 dport=22
>
> %nft delete rule ip raw output handle <handle>
> %./libnftnl/examples/nft-ct-timeout-del ip raw cttime
>
> Signed-off-by: Harsha Sharma <[email protected]>
> ---
No changes, submitting it again after the preparation patches.
Thanks.
> Changes in v10:
> - remove all ifdef in nft_ct
> - minor changes
> Changes in v9:
> - change in log message
> - add cttimeout_list in netns_nftables struct
> - minor changes
> Changes in v8:
> - Add ifdef for CONFIG_NF_CT_NETLINK_TIMEOUT in nft_ct_timeout_obj_ops
> Changes in v7:
> - initialise list_head for nfct_timeout_list in nf_tables_api
> - use nf_ct_untimeout for cleanup
> - other minor changes
> Changes in v6:
> - Remove unnecessary chunks
> - initialise timeout list in nf_tables_api.c
> - minor changes
> Changes in v5:
> - wrap with NF_CT_NETLINK_TIMEOUT option
> - attach timeout template in init
> - other minor changes
> Changes in v4:
> - Remove unused attributes
> - allocate template from init() path
> - minor changes
> - updated log message
> - pull to latest tree
> Changes in v3:
> - Use nf_ct_tmpl_alloc to attach timeout via template conntrack.
> Changes in v2:
> - Add code for nft_ct_timeout_obj_eval
> - remove likely() from code
> - remove vla in ctnl_timeout_parse_policy
>
> include/net/netfilter/nf_conntrack_l4proto.h | 2 -
> include/net/netns/nftables.h | 1 +
> include/uapi/linux/netfilter/nf_tables.h | 14 +-
> net/netfilter/nf_tables_api.c | 1 +
> net/netfilter/nft_ct.c | 190
> +++++++++++++++++++++++++++
> 5 files changed, 205 insertions(+), 3 deletions(-)
>
> diff --git a/include/net/netfilter/nf_conntrack_l4proto.h
> b/include/net/netfilter/nf_conntrack_l4proto.h
> index 6068c6da3eac..8465263b297d 100644
> --- a/include/net/netfilter/nf_conntrack_l4proto.h
> +++ b/include/net/netfilter/nf_conntrack_l4proto.h
> @@ -77,7 +77,6 @@ struct nf_conntrack_l4proto {
> struct nf_conntrack_tuple *t);
> const struct nla_policy *nla_policy;
>
> -#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
> struct {
> int (*nlattr_to_obj)(struct nlattr *tb[],
> struct net *net, void *data);
> @@ -87,7 +86,6 @@ struct nf_conntrack_l4proto {
> u16 nlattr_max;
> const struct nla_policy *nla_policy;
> } ctnl_timeout;
> -#endif
> #ifdef CONFIG_NF_CONNTRACK_PROCFS
> /* Print out the private part of the conntrack. */
> void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
> diff --git a/include/net/netns/nftables.h b/include/net/netns/nftables.h
> index 286fd960896f..ce99ff4c6be5 100644
> --- a/include/net/netns/nftables.h
> +++ b/include/net/netns/nftables.h
> @@ -11,6 +11,7 @@ struct netns_nftables {
> unsigned int base_seq;
> u8 gencursor;
> u8 validate_state;
> + struct list_head cttimeout_list;
> };
>
> #endif
> diff --git a/include/uapi/linux/netfilter/nf_tables.h
> b/include/uapi/linux/netfilter/nf_tables.h
> index f466860bcf75..e0bda30dd30c 100644
> --- a/include/uapi/linux/netfilter/nf_tables.h
> +++ b/include/uapi/linux/netfilter/nf_tables.h
> @@ -957,6 +957,7 @@ enum nft_socket_keys {
> * @NFT_CT_DST_IP: conntrack layer 3 protocol destination (IPv4 address)
> * @NFT_CT_SRC_IP6: conntrack layer 3 protocol source (IPv6 address)
> * @NFT_CT_DST_IP6: conntrack layer 3 protocol destination (IPv6 address)
> + * @NFT_CT_TIMEOUT: connection tracking timeout policy assigned to conntrack
> */
> enum nft_ct_keys {
> NFT_CT_STATE,
> @@ -982,6 +983,7 @@ enum nft_ct_keys {
> NFT_CT_DST_IP,
> NFT_CT_SRC_IP6,
> NFT_CT_DST_IP6,
> + NFT_CT_TIMEOUT,
> __NFT_CT_MAX
> };
> #define NFT_CT_MAX (__NFT_CT_MAX - 1)
> @@ -1394,13 +1396,23 @@ enum nft_ct_helper_attributes {
> };
> #define NFTA_CT_HELPER_MAX (__NFTA_CT_HELPER_MAX - 1)
>
> +enum nft_ct_timeout_timeout_attributes {
> + NFTA_CT_TIMEOUT_UNSPEC,
> + NFTA_CT_TIMEOUT_L3PROTO,
> + NFTA_CT_TIMEOUT_L4PROTO,
> + NFTA_CT_TIMEOUT_DATA,
> + __NFTA_CT_TIMEOUT_MAX,
> +};
> +#define NFTA_CT_TIMEOUT_MAX (__NFTA_CT_TIMEOUT_MAX - 1)
> +
> #define NFT_OBJECT_UNSPEC 0
> #define NFT_OBJECT_COUNTER 1
> #define NFT_OBJECT_QUOTA 2
> #define NFT_OBJECT_CT_HELPER 3
> #define NFT_OBJECT_LIMIT 4
> #define NFT_OBJECT_CONNLIMIT 5
> -#define __NFT_OBJECT_MAX 6
> +#define NFT_OBJECT_CT_TIMEOUT 6
> +#define __NFT_OBJECT_MAX 7
> #define NFT_OBJECT_MAX (__NFT_OBJECT_MAX - 1)
>
> /**
> diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
> index c0fb2bcd30fe..3e5baeab1bf2 100644
> --- a/net/netfilter/nf_tables_api.c
> +++ b/net/netfilter/nf_tables_api.c
> @@ -7232,6 +7232,7 @@ static int __net_init nf_tables_init_net(struct net
> *net)
> {
> INIT_LIST_HEAD(&net->nft.tables);
> INIT_LIST_HEAD(&net->nft.commit_list);
> + INIT_LIST_HEAD(&net->nft.cttimeout_list);
> mutex_init(&net->nft.commit_mutex);
> net->nft.base_seq = 1;
> net->nft.validate_state = NFT_VALIDATE_SKIP;
> diff --git a/net/netfilter/nft_ct.c b/net/netfilter/nft_ct.c
> index 3bc82ee5464d..5ff5cf37ff70 100644
> --- a/net/netfilter/nft_ct.c
> +++ b/net/netfilter/nft_ct.c
> @@ -22,6 +22,8 @@
> #include <net/netfilter/nf_conntrack_helper.h>
> #include <net/netfilter/nf_conntrack_ecache.h>
> #include <net/netfilter/nf_conntrack_labels.h>
> +#include <net/netfilter/nf_conntrack_timeout.h>
> +#include <net/netfilter/nf_conntrack_l4proto.h>
>
> struct nft_ct {
> enum nft_ct_keys key:8;
> @@ -38,6 +40,11 @@ struct nft_ct_helper_obj {
> u8 l4proto;
> };
>
> +struct nft_ct_timeout_obj {
> + struct ctnl_timeout *timeout;
> + struct nf_conn *tmpl;
> +};
> +
> #ifdef CONFIG_NF_CONNTRACK_ZONES
> static DEFINE_PER_CPU(struct nf_conn *, nft_ct_pcpu_template);
> static unsigned int nft_ct_pcpu_template_refcnt __read_mostly;
> @@ -765,6 +772,157 @@ static struct nft_expr_type nft_notrack_type
> __read_mostly = {
> .owner = THIS_MODULE,
> };
>
> +static int
> +nft_ct_timeout_parse_policy(void *timeouts,
> + const struct nf_conntrack_l4proto *l4proto,
> + struct net *net, const struct nlattr *attr)
> +{
> + struct nlattr **tb;
> + int ret = 0;
> +
> + if (!l4proto->ctnl_timeout.nlattr_to_obj)
> + return 0;
> +
> + tb = kcalloc(l4proto->ctnl_timeout.nlattr_max + 1, sizeof(*tb),
> + GFP_KERNEL);
> +
> + if (!tb)
> + return -ENOMEM;
> +
> + ret = nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max,
> + attr, l4proto->ctnl_timeout.nla_policy,
> + NULL);
> + if (ret < 0)
> + goto err;
> +
> + ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts);
> +
> +err:
> + kfree(tb);
> + return ret;
> +}
> +
> +static void nft_ct_timeout_obj_eval(struct nft_object *obj,
> + struct nft_regs *regs,
> + const struct nft_pktinfo *pkt)
> +{
> + const struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
> + struct sk_buff *skb = pkt->skb;
> + enum ip_conntrack_info ctinfo;
> +
> + if (nf_ct_get(skb, &ctinfo))
> + return;
> +
> + nf_ct_set(skb, priv->tmpl, IP_CT_NEW);
> +}
> +
> +static int nft_ct_timeout_obj_init(const struct nft_ctx *ctx,
> + const struct nlattr * const tb[],
> + struct nft_object *obj)
> +{
> + const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt;
> + struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
> + struct ctnl_timeout *timeout;
> + const struct nf_conntrack_l4proto *l4proto;
> + struct nf_conn_timeout *timeout_ext;
> + int l3num = ctx->family;
> + struct nf_conn *tmpl;
> + __u8 l4num;
> + int ret;
> +
> + if (!tb[NFTA_CT_TIMEOUT_L3PROTO] ||
> + !tb[NFTA_CT_TIMEOUT_L4PROTO] ||
> + !tb[NFTA_CT_TIMEOUT_DATA])
> + return -EINVAL;
> +
> + l3num = ntohs(nla_get_be16(tb[NFTA_CT_TIMEOUT_L3PROTO]));
> + l4num = nla_get_u8(tb[NFTA_CT_TIMEOUT_L4PROTO]);
> + l4proto = nf_ct_l4proto_find_get(l3num, l4num);
> +
> + if (l4proto->l4proto != l4num) {
> + ret = -EOPNOTSUPP;
> + goto err_proto_put;
> + }
> +
> + timeout = kzalloc(sizeof(struct ctnl_timeout) +
> + l4proto->ctnl_timeout.obj_size, GFP_KERNEL);
> + if (timeout == NULL) {
> + ret = -ENOMEM;
> + goto err_proto_put;
> + }
> +
> + ret = nft_ct_timeout_parse_policy(&timeout->data, l4proto, ctx->net,
> + tb[NFTA_CT_TIMEOUT_DATA]);
> + if (ret < 0)
> + goto err;
> + timeout->l3num = l3num;
> + timeout->l4proto = l4proto;
> + priv->timeout = timeout;
> + tmpl = nf_ct_tmpl_alloc(ctx->net, zone, GFP_ATOMIC);
> + if (!tmpl) {
> + ret = -ENOMEM;
> + goto err;
> + }
> + timeout_ext = nf_ct_timeout_ext_add(tmpl, priv->timeout,
> + GFP_ATOMIC);
> +
> + if (!timeout_ext) {
> + nf_ct_tmpl_free(tmpl);
> + ret = -ENOMEM;
> + goto err;
> + }
> +
> + priv->tmpl = tmpl;
> + refcount_set(&priv->timeout->refcnt, 1);
> + rcu_assign_pointer(timeout_ext->timeout, priv->timeout);
> + list_add_tail_rcu(&timeout->head, &ctx->net->nft.cttimeout_list);
> + return 0;
> +
> +err:
> + kfree(timeout);
> + return ret;
> +err_proto_put:
> + nf_ct_l4proto_put(l4proto);
> + return ret;
> +}
> +
> +static void nft_ct_timeout_obj_destroy(const struct nft_ctx *ctx,
> + struct nft_object *obj)
> +{
> + struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
> +
> + nf_ct_tmpl_free(priv->tmpl);
> +
> + if (refcount_dec_if_one(&priv->timeout->refcnt)) {
> + nf_ct_l4proto_put(priv->timeout->l4proto);
> + list_del_rcu(&priv->timeout->head);
> + nf_ct_untimeout(ctx->net, priv->timeout);
> + }
> +}
> +
> +static int nft_ct_timeout_obj_dump(struct sk_buff *skb,
> + struct nft_object *obj, bool reset)
> +{
> + const struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
> + const struct ctnl_timeout *timeout = priv->timeout;
> + struct nlattr *nest_params;
> + int ret;
> +
> + if (nla_put_u8(skb, NFTA_CT_TIMEOUT_L4PROTO,
> timeout->l4proto->l4proto) ||
> + nla_put_be16(skb, NFTA_CT_TIMEOUT_L3PROTO, htons(timeout->l3num)))
> + return -1;
> +
> + nest_params = nla_nest_start(skb, NFTA_CT_TIMEOUT_DATA |
> NLA_F_NESTED);
> + if (!nest_params)
> + return -1;
> +
> + ret = timeout->l4proto->ctnl_timeout.obj_to_nlattr(skb,
> &timeout->data);
> + if (ret < 0)
> + return -1;
> + nla_nest_end(skb, nest_params);
> + return 0;
> +}
> +
> static int nft_ct_helper_obj_init(const struct nft_ctx *ctx,
> const struct nlattr * const tb[],
> struct nft_object *obj)
> @@ -932,6 +1090,31 @@ static struct nft_object_type nft_ct_helper_obj_type
> __read_mostly = {
> .owner = THIS_MODULE,
> };
>
> +static const struct nla_policy nft_ct_timeout_policy[NFTA_CT_TIMEOUT_MAX +
> 1] = {
> + [NFTA_CT_TIMEOUT_L3PROTO] = {.type = NLA_U16 },
> + [NFTA_CT_TIMEOUT_L4PROTO] = {.type = NLA_U8 },
> + [NFTA_CT_TIMEOUT_DATA] = {.type = NLA_NESTED },
> +};
> +
> +static struct nft_object_type nft_ct_timeout_obj_type;
> +
> +static const struct nft_object_ops nft_ct_timeout_obj_ops = {
> + .type = &nft_ct_timeout_obj_type,
> + .size = sizeof(struct nft_ct_timeout_obj),
> + .eval = nft_ct_timeout_obj_eval,
> + .init = nft_ct_timeout_obj_init,
> + .destroy = nft_ct_timeout_obj_destroy,
> + .dump = nft_ct_timeout_obj_dump,
> +};
> +
> +static struct nft_object_type nft_ct_timeout_obj_type __read_mostly = {
> + .type = NFT_OBJECT_CT_TIMEOUT,
> + .ops = &nft_ct_timeout_obj_ops,
> + .maxattr = NFTA_CT_TIMEOUT_MAX,
> + .policy = nft_ct_timeout_policy,
> + .owner = THIS_MODULE,
> +};
> +
> static int __init nft_ct_module_init(void)
> {
> int err;
> @@ -949,9 +1132,14 @@ static int __init nft_ct_module_init(void)
> err = nft_register_obj(&nft_ct_helper_obj_type);
> if (err < 0)
> goto err2;
> + err = nft_register_obj(&nft_ct_timeout_obj_type);
> + if (err < 0)
> + goto err3;
>
> return 0;
>
> +err3:
> + nft_unregister_obj(&nft_ct_helper_obj_type);
> err2:
> nft_unregister_expr(&nft_notrack_type);
> err1:
> @@ -962,6 +1150,7 @@ static int __init nft_ct_module_init(void)
> static void __exit nft_ct_module_exit(void)
> {
> nft_unregister_obj(&nft_ct_helper_obj_type);
> + nft_unregister_obj(&nft_ct_timeout_obj_type);
> nft_unregister_expr(&nft_notrack_type);
> nft_unregister_expr(&nft_ct_type);
> }
> @@ -974,3 +1163,4 @@ MODULE_AUTHOR("Patrick McHardy <[email protected]>");
> MODULE_ALIAS_NFT_EXPR("ct");
> MODULE_ALIAS_NFT_EXPR("notrack");
> MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_HELPER);
> +MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_TIMEOUT);
> --
> 2.14.1
>
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