diff options
Diffstat (limited to 'net/netfilter/nfnetlink_cttimeout.c')
| -rw-r--r-- | net/netfilter/nfnetlink_cttimeout.c | 161 |
1 files changed, 153 insertions, 8 deletions
diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c index 50580494148d..476accd17145 100644 --- 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 = { |