netfilter: cttimeout: allow to set/get default protocol timeouts

Default timeouts are currently set via proc/sysctl interface, the
typical pattern is a file name like:

/proc/sys/net/netfilter/nf_conntrack_PROTOCOL_timeout_STATE

This results in one entry per default protocol state timeout.
This patch simplifies this by allowing to set default protocol
timeouts via cttimeout netlink interface.

This should allow us to get rid of the existing proc/sysctl code
in the midterm.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/include/uapi/linux/netfilter/nfnetlink_cttimeout.h b/include/uapi/linux/netfilter/nfnetlink_cttimeout.h
index a2810a7c5e3002d63c9651e25830431a39d51abb..1ab0b97b3a1e68336485b2679045024e86ff5444 100644 (file)
--- a/include/uapi/linux/netfilter/nfnetlink_cttimeout.h
+++ b/include/uapi/linux/netfilter/nfnetlink_cttimeout.h
@@ -6,6 +6,8 @@ enum ctnl_timeout_msg_types {
        IPCTNL_MSG_TIMEOUT_NEW,
        IPCTNL_MSG_TIMEOUT_GET,
        IPCTNL_MSG_TIMEOUT_DELETE,
+       IPCTNL_MSG_TIMEOUT_DEFAULT_SET,
+       IPCTNL_MSG_TIMEOUT_DEFAULT_GET,
 
        IPCTNL_MSG_TIMEOUT_MAX
 };

diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c
index 50580494148d00433c092ee0ad2a7097a1653221..476accd171452fcfbfbe01018dcadd55fee41f67 100644 (file)
--- a/net/netfilter/nfnetlink_cttimeout.c
+++ b/net/netfilter/nfnetlink_cttimeout.c
@@ -49,10 +49,8 @@ static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = {
 };
 
 static int
-ctnl_timeout_parse_policy(struct ctnl_timeout *timeout,
-                         struct nf_conntrack_l4proto *l4proto,
-                         struct net *net,
-                         const struct nlattr *attr)
+ctnl_timeout_parse_policy(void *timeouts, struct nf_conntrack_l4proto *l4proto,
+                         struct net *net, const struct nlattr *attr)
 {
        int ret = 0;
 
@@ -64,8 +62,7 @@ ctnl_timeout_parse_policy(struct ctnl_timeout *timeout,
                if (ret < 0)
                        return ret;
 
-               ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net,
-                                                         &timeout->data);
+               ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts);
        }
        return ret;
 }
@@ -123,7 +120,8 @@ cttimeout_new_timeout(struct sock *ctnl, struct sk_buff *skb,
                                goto err_proto_put;
                        }
 
-                       ret = ctnl_timeout_parse_policy(matching, l4proto, net,
+                       ret = ctnl_timeout_parse_policy(&matching->data,
+                                                       l4proto, net,
                                                        cda[CTA_TIMEOUT_DATA]);
                        return ret;
                }
@@ -138,7 +136,7 @@ cttimeout_new_timeout(struct sock *ctnl, struct sk_buff *skb,
                goto err_proto_put;
        }
 
-       ret = ctnl_timeout_parse_policy(timeout, l4proto, net,
+       ret = ctnl_timeout_parse_policy(&timeout->data, l4proto, net,
                                        cda[CTA_TIMEOUT_DATA]);
        if (ret < 0)
                goto err;
@@ -342,6 +340,147 @@ cttimeout_del_timeout(struct sock *ctnl, struct sk_buff *skb,
        return ret;
 }
 
+static int
+cttimeout_default_set(struct sock *ctnl, struct sk_buff *skb,
+                     const struct nlmsghdr *nlh,
+                     const struct nlattr * const cda[])
+{
+       __u16 l3num;
+       __u8 l4num;
+       struct nf_conntrack_l4proto *l4proto;
+       struct net *net = sock_net(skb->sk);
+       unsigned int *timeouts;
+       int ret;
+
+       if (!cda[CTA_TIMEOUT_L3PROTO] ||
+           !cda[CTA_TIMEOUT_L4PROTO] ||
+           !cda[CTA_TIMEOUT_DATA])
+               return -EINVAL;
+
+       l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
+       l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
+       l4proto = nf_ct_l4proto_find_get(l3num, l4num);
+
+       /* This protocol is not supported, skip. */
+       if (l4proto->l4proto != l4num) {
+               ret = -EOPNOTSUPP;
+               goto err;
+       }
+
+       timeouts = l4proto->get_timeouts(net);
+
+       ret = ctnl_timeout_parse_policy(timeouts, l4proto, net,
+                                       cda[CTA_TIMEOUT_DATA]);
+       if (ret < 0)
+               goto err;
+
+       nf_ct_l4proto_put(l4proto);
+       return 0;
+err:
+       nf_ct_l4proto_put(l4proto);
+       return ret;
+}
+
+static int
+cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid,
+                           u32 seq, u32 type, int event,
+                           struct nf_conntrack_l4proto *l4proto)
+{
+       struct nlmsghdr *nlh;
+       struct nfgenmsg *nfmsg;
+       unsigned int flags = portid ? NLM_F_MULTI : 0;
+
+       event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8;
+       nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
+       if (nlh == NULL)
+               goto nlmsg_failure;
+
+       nfmsg = nlmsg_data(nlh);
+       nfmsg->nfgen_family = AF_UNSPEC;
+       nfmsg->version = NFNETLINK_V0;
+       nfmsg->res_id = 0;
+
+       if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l4proto->l3proto)) ||
+           nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto))
+               goto nla_put_failure;
+
+       if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) {
+               struct nlattr *nest_parms;
+               unsigned int *timeouts = l4proto->get_timeouts(net);
+               int ret;
+
+               nest_parms = nla_nest_start(skb,
+                                           CTA_TIMEOUT_DATA | NLA_F_NESTED);
+               if (!nest_parms)
+                       goto nla_put_failure;
+
+               ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts);
+               if (ret < 0)
+                       goto nla_put_failure;
+
+               nla_nest_end(skb, nest_parms);
+       }
+
+       nlmsg_end(skb, nlh);
+       return skb->len;
+
+nlmsg_failure:
+nla_put_failure:
+       nlmsg_cancel(skb, nlh);
+       return -1;
+}
+
+static int cttimeout_default_get(struct sock *ctnl, struct sk_buff *skb,
+                                const struct nlmsghdr *nlh,
+                                const struct nlattr * const cda[])
+{
+       __u16 l3num;
+       __u8 l4num;
+       struct nf_conntrack_l4proto *l4proto;
+       struct net *net = sock_net(skb->sk);
+       struct sk_buff *skb2;
+       int ret, err;
+
+       if (!cda[CTA_TIMEOUT_L3PROTO] || !cda[CTA_TIMEOUT_L4PROTO])
+               return -EINVAL;
+
+       l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
+       l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
+       l4proto = nf_ct_l4proto_find_get(l3num, l4num);
+
+       /* This protocol is not supported, skip. */
+       if (l4proto->l4proto != l4num) {
+               err = -EOPNOTSUPP;
+               goto err;
+       }
+
+       skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+       if (skb2 == NULL) {
+               err = -ENOMEM;
+               goto err;
+       }
+
+       ret = cttimeout_default_fill_info(net, skb2, NETLINK_CB(skb).portid,
+                                         nlh->nlmsg_seq,
+                                         NFNL_MSG_TYPE(nlh->nlmsg_type),
+                                         IPCTNL_MSG_TIMEOUT_DEFAULT_SET,
+                                         l4proto);
+       if (ret <= 0) {
+               kfree_skb(skb2);
+               err = -ENOMEM;
+               goto err;
+       }
+       ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
+       if (ret > 0)
+               ret = 0;
+
+       /* this avoids a loop in nfnetlink. */
+       return ret == -EAGAIN ? -ENOBUFS : ret;
+err:
+       nf_ct_l4proto_put(l4proto);
+       return err;
+}
+
 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
 static struct ctnl_timeout *ctnl_timeout_find_get(const char *name)
 {
@@ -384,6 +523,12 @@ static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = {
        [IPCTNL_MSG_TIMEOUT_DELETE]     = { .call = cttimeout_del_timeout,
                                            .attr_count = CTA_TIMEOUT_MAX,
                                            .policy = cttimeout_nla_policy },
+       [IPCTNL_MSG_TIMEOUT_DEFAULT_SET]= { .call = cttimeout_default_set,
+                                           .attr_count = CTA_TIMEOUT_MAX,
+                                           .policy = cttimeout_nla_policy },
+       [IPCTNL_MSG_TIMEOUT_DEFAULT_GET]= { .call = cttimeout_default_get,
+                                           .attr_count = CTA_TIMEOUT_MAX,
+                                           .policy = cttimeout_nla_policy },
 };
 
 static const struct nfnetlink_subsystem cttimeout_subsys = {