![Gustavo A. R. Silva](/assets/img/avatar_default.png)
In preparation to enabling -Wvla, remove VLA and replace it with dynamic memory allocation. >From a security viewpoint, the use of Variable Length Arrays can be a vector for stack overflow attacks. Also, in general, as the code evolves it is easy to lose track of how big a VLA can get. Thus, we can end up having segfaults that are hard to debug. Also, fixed as part of the directive to remove all VLAs from the kernel: https://lkml.org/lkml/2018/3/7/621 While at it, remove likely() notation which is not necessary from the control plane code. Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
638 lines
16 KiB
C
638 lines
16 KiB
C
/*
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* (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
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* (C) 2012 by Vyatta Inc. <http://www.vyatta.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation (or any later at your option).
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/rculist.h>
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#include <linux/rculist_nulls.h>
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#include <linux/types.h>
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#include <linux/timer.h>
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#include <linux/security.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <linux/netlink.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/netfilter.h>
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#include <net/netlink.h>
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#include <net/sock.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_l3proto.h>
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#include <net/netfilter/nf_conntrack_l4proto.h>
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#include <net/netfilter/nf_conntrack_tuple.h>
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#include <net/netfilter/nf_conntrack_timeout.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nfnetlink_cttimeout.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
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MODULE_DESCRIPTION("cttimeout: Extended Netfilter Connection Tracking timeout tuning");
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static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = {
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[CTA_TIMEOUT_NAME] = { .type = NLA_NUL_STRING,
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.len = CTNL_TIMEOUT_NAME_MAX - 1},
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[CTA_TIMEOUT_L3PROTO] = { .type = NLA_U16 },
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[CTA_TIMEOUT_L4PROTO] = { .type = NLA_U8 },
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[CTA_TIMEOUT_DATA] = { .type = NLA_NESTED },
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};
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static int
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ctnl_timeout_parse_policy(void *timeouts,
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const struct nf_conntrack_l4proto *l4proto,
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struct net *net, const struct nlattr *attr)
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{
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struct nlattr **tb;
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int ret = 0;
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if (!l4proto->ctnl_timeout.nlattr_to_obj)
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return 0;
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tb = kcalloc(l4proto->ctnl_timeout.nlattr_max + 1, sizeof(*tb),
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GFP_KERNEL);
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if (!tb)
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return -ENOMEM;
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ret = nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max, attr,
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l4proto->ctnl_timeout.nla_policy, NULL);
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if (ret < 0)
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goto err;
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ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts);
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err:
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kfree(tb);
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return ret;
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}
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static int cttimeout_new_timeout(struct net *net, struct sock *ctnl,
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struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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const struct nlattr * const cda[],
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struct netlink_ext_ack *extack)
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{
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__u16 l3num;
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__u8 l4num;
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const struct nf_conntrack_l4proto *l4proto;
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struct ctnl_timeout *timeout, *matching = NULL;
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char *name;
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int ret;
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if (!cda[CTA_TIMEOUT_NAME] ||
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!cda[CTA_TIMEOUT_L3PROTO] ||
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!cda[CTA_TIMEOUT_L4PROTO] ||
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!cda[CTA_TIMEOUT_DATA])
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return -EINVAL;
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name = nla_data(cda[CTA_TIMEOUT_NAME]);
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l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
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l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
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list_for_each_entry(timeout, &net->nfct_timeout_list, head) {
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if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
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continue;
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if (nlh->nlmsg_flags & NLM_F_EXCL)
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return -EEXIST;
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matching = timeout;
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break;
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}
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if (matching) {
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if (nlh->nlmsg_flags & NLM_F_REPLACE) {
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/* You cannot replace one timeout policy by another of
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* different kind, sorry.
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*/
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if (matching->l3num != l3num ||
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matching->l4proto->l4proto != l4num)
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return -EINVAL;
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return ctnl_timeout_parse_policy(&matching->data,
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matching->l4proto, net,
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cda[CTA_TIMEOUT_DATA]);
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}
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return -EBUSY;
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}
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l4proto = nf_ct_l4proto_find_get(l3num, l4num);
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/* This protocol is not supportted, skip. */
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if (l4proto->l4proto != l4num) {
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ret = -EOPNOTSUPP;
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goto err_proto_put;
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}
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timeout = kzalloc(sizeof(struct ctnl_timeout) +
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l4proto->ctnl_timeout.obj_size, GFP_KERNEL);
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if (timeout == NULL) {
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ret = -ENOMEM;
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goto err_proto_put;
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}
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ret = ctnl_timeout_parse_policy(&timeout->data, l4proto, net,
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cda[CTA_TIMEOUT_DATA]);
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if (ret < 0)
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goto err;
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strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME]));
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timeout->l3num = l3num;
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timeout->l4proto = l4proto;
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refcount_set(&timeout->refcnt, 1);
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list_add_tail_rcu(&timeout->head, &net->nfct_timeout_list);
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return 0;
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err:
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kfree(timeout);
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err_proto_put:
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nf_ct_l4proto_put(l4proto);
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return ret;
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}
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static int
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ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
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int event, struct ctnl_timeout *timeout)
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{
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struct nlmsghdr *nlh;
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struct nfgenmsg *nfmsg;
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unsigned int flags = portid ? NLM_F_MULTI : 0;
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const struct nf_conntrack_l4proto *l4proto = timeout->l4proto;
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event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
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nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
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if (nlh == NULL)
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goto nlmsg_failure;
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nfmsg = nlmsg_data(nlh);
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nfmsg->nfgen_family = AF_UNSPEC;
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nfmsg->version = NFNETLINK_V0;
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nfmsg->res_id = 0;
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if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) ||
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nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)) ||
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nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) ||
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nla_put_be32(skb, CTA_TIMEOUT_USE,
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htonl(refcount_read(&timeout->refcnt))))
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goto nla_put_failure;
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if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) {
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struct nlattr *nest_parms;
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int ret;
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nest_parms = nla_nest_start(skb,
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CTA_TIMEOUT_DATA | NLA_F_NESTED);
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if (!nest_parms)
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goto nla_put_failure;
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ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data);
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if (ret < 0)
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goto nla_put_failure;
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nla_nest_end(skb, nest_parms);
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}
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nlmsg_end(skb, nlh);
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return skb->len;
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nlmsg_failure:
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nla_put_failure:
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nlmsg_cancel(skb, nlh);
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return -1;
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}
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static int
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ctnl_timeout_dump(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct net *net = sock_net(skb->sk);
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struct ctnl_timeout *cur, *last;
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if (cb->args[2])
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return 0;
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last = (struct ctnl_timeout *)cb->args[1];
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if (cb->args[1])
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cb->args[1] = 0;
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rcu_read_lock();
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list_for_each_entry_rcu(cur, &net->nfct_timeout_list, head) {
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if (last) {
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if (cur != last)
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continue;
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last = NULL;
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}
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if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq,
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NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
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IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) {
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cb->args[1] = (unsigned long)cur;
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break;
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}
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}
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if (!cb->args[1])
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cb->args[2] = 1;
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rcu_read_unlock();
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return skb->len;
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}
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static int cttimeout_get_timeout(struct net *net, struct sock *ctnl,
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struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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const struct nlattr * const cda[],
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struct netlink_ext_ack *extack)
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{
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int ret = -ENOENT;
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char *name;
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struct ctnl_timeout *cur;
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if (nlh->nlmsg_flags & NLM_F_DUMP) {
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struct netlink_dump_control c = {
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.dump = ctnl_timeout_dump,
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};
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return netlink_dump_start(ctnl, skb, nlh, &c);
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}
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if (!cda[CTA_TIMEOUT_NAME])
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return -EINVAL;
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name = nla_data(cda[CTA_TIMEOUT_NAME]);
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list_for_each_entry(cur, &net->nfct_timeout_list, head) {
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struct sk_buff *skb2;
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if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
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continue;
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skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (skb2 == NULL) {
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ret = -ENOMEM;
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break;
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}
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ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).portid,
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nlh->nlmsg_seq,
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NFNL_MSG_TYPE(nlh->nlmsg_type),
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IPCTNL_MSG_TIMEOUT_NEW, cur);
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if (ret <= 0) {
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kfree_skb(skb2);
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break;
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}
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ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid,
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MSG_DONTWAIT);
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if (ret > 0)
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ret = 0;
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/* this avoids a loop in nfnetlink. */
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return ret == -EAGAIN ? -ENOBUFS : ret;
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}
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return ret;
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}
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static int untimeout(struct nf_conn *ct, void *timeout)
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{
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struct nf_conn_timeout *timeout_ext = nf_ct_timeout_find(ct);
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if (timeout_ext && (!timeout || timeout_ext->timeout == timeout))
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RCU_INIT_POINTER(timeout_ext->timeout, NULL);
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/* We are not intended to delete this conntrack. */
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return 0;
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}
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static void ctnl_untimeout(struct net *net, struct ctnl_timeout *timeout)
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{
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nf_ct_iterate_cleanup_net(net, untimeout, timeout, 0, 0);
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}
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/* try to delete object, fail if it is still in use. */
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static int ctnl_timeout_try_del(struct net *net, struct ctnl_timeout *timeout)
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{
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int ret = 0;
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/* We want to avoid races with ctnl_timeout_put. So only when the
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* current refcnt is 1, we decrease it to 0.
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*/
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if (refcount_dec_if_one(&timeout->refcnt)) {
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/* We are protected by nfnl mutex. */
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list_del_rcu(&timeout->head);
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nf_ct_l4proto_put(timeout->l4proto);
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ctnl_untimeout(net, timeout);
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kfree_rcu(timeout, rcu_head);
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} else {
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ret = -EBUSY;
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}
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return ret;
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}
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static int cttimeout_del_timeout(struct net *net, struct sock *ctnl,
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struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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const struct nlattr * const cda[],
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struct netlink_ext_ack *extack)
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{
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struct ctnl_timeout *cur, *tmp;
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int ret = -ENOENT;
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char *name;
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if (!cda[CTA_TIMEOUT_NAME]) {
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list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list,
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head)
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ctnl_timeout_try_del(net, cur);
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return 0;
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}
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name = nla_data(cda[CTA_TIMEOUT_NAME]);
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list_for_each_entry(cur, &net->nfct_timeout_list, head) {
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if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
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continue;
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ret = ctnl_timeout_try_del(net, cur);
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if (ret < 0)
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return ret;
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break;
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}
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return ret;
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}
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static int cttimeout_default_set(struct net *net, struct sock *ctnl,
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struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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const struct nlattr * const cda[],
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struct netlink_ext_ack *extack)
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{
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const struct nf_conntrack_l4proto *l4proto;
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unsigned int *timeouts;
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__u16 l3num;
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__u8 l4num;
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int ret;
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if (!cda[CTA_TIMEOUT_L3PROTO] ||
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!cda[CTA_TIMEOUT_L4PROTO] ||
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!cda[CTA_TIMEOUT_DATA])
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return -EINVAL;
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l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
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l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
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l4proto = nf_ct_l4proto_find_get(l3num, l4num);
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/* This protocol is not supported, skip. */
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if (l4proto->l4proto != l4num) {
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ret = -EOPNOTSUPP;
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goto err;
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}
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timeouts = l4proto->get_timeouts(net);
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ret = ctnl_timeout_parse_policy(timeouts, l4proto, net,
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cda[CTA_TIMEOUT_DATA]);
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if (ret < 0)
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goto err;
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nf_ct_l4proto_put(l4proto);
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return 0;
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err:
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nf_ct_l4proto_put(l4proto);
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return ret;
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}
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static int
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cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid,
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u32 seq, u32 type, int event,
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const struct nf_conntrack_l4proto *l4proto)
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{
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struct nlmsghdr *nlh;
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struct nfgenmsg *nfmsg;
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unsigned int flags = portid ? NLM_F_MULTI : 0;
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event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
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nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
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if (nlh == NULL)
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goto nlmsg_failure;
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nfmsg = nlmsg_data(nlh);
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nfmsg->nfgen_family = AF_UNSPEC;
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nfmsg->version = NFNETLINK_V0;
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nfmsg->res_id = 0;
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if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l4proto->l3proto)) ||
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nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto))
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goto nla_put_failure;
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if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) {
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struct nlattr *nest_parms;
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unsigned int *timeouts = l4proto->get_timeouts(net);
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int ret;
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nest_parms = nla_nest_start(skb,
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CTA_TIMEOUT_DATA | NLA_F_NESTED);
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if (!nest_parms)
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goto nla_put_failure;
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ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts);
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if (ret < 0)
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goto nla_put_failure;
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nla_nest_end(skb, nest_parms);
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}
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nlmsg_end(skb, nlh);
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return skb->len;
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nlmsg_failure:
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nla_put_failure:
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nlmsg_cancel(skb, nlh);
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return -1;
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}
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static int cttimeout_default_get(struct net *net, struct sock *ctnl,
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struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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const struct nlattr * const cda[],
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struct netlink_ext_ack *extack)
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{
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const struct nf_conntrack_l4proto *l4proto;
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struct sk_buff *skb2;
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int ret, err;
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__u16 l3num;
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__u8 l4num;
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if (!cda[CTA_TIMEOUT_L3PROTO] || !cda[CTA_TIMEOUT_L4PROTO])
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return -EINVAL;
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l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
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l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
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l4proto = nf_ct_l4proto_find_get(l3num, l4num);
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/* This protocol is not supported, skip. */
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if (l4proto->l4proto != l4num) {
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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(struct net *net, const char *name)
|
|
{
|
|
struct ctnl_timeout *timeout, *matching = NULL;
|
|
|
|
list_for_each_entry_rcu(timeout, &net->nfct_timeout_list, head) {
|
|
if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
|
|
continue;
|
|
|
|
if (!try_module_get(THIS_MODULE))
|
|
goto err;
|
|
|
|
if (!refcount_inc_not_zero(&timeout->refcnt)) {
|
|
module_put(THIS_MODULE);
|
|
goto err;
|
|
}
|
|
matching = timeout;
|
|
break;
|
|
}
|
|
err:
|
|
return matching;
|
|
}
|
|
|
|
static void ctnl_timeout_put(struct ctnl_timeout *timeout)
|
|
{
|
|
if (refcount_dec_and_test(&timeout->refcnt))
|
|
kfree_rcu(timeout, rcu_head);
|
|
|
|
module_put(THIS_MODULE);
|
|
}
|
|
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
|
|
|
|
static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = {
|
|
[IPCTNL_MSG_TIMEOUT_NEW] = { .call = cttimeout_new_timeout,
|
|
.attr_count = CTA_TIMEOUT_MAX,
|
|
.policy = cttimeout_nla_policy },
|
|
[IPCTNL_MSG_TIMEOUT_GET] = { .call = cttimeout_get_timeout,
|
|
.attr_count = CTA_TIMEOUT_MAX,
|
|
.policy = cttimeout_nla_policy },
|
|
[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 = {
|
|
.name = "conntrack_timeout",
|
|
.subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT,
|
|
.cb_count = IPCTNL_MSG_TIMEOUT_MAX,
|
|
.cb = cttimeout_cb,
|
|
};
|
|
|
|
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT);
|
|
|
|
static int __net_init cttimeout_net_init(struct net *net)
|
|
{
|
|
INIT_LIST_HEAD(&net->nfct_timeout_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit cttimeout_net_exit(struct net *net)
|
|
{
|
|
struct ctnl_timeout *cur, *tmp;
|
|
|
|
nf_ct_unconfirmed_destroy(net);
|
|
ctnl_untimeout(net, NULL);
|
|
|
|
list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, head) {
|
|
list_del_rcu(&cur->head);
|
|
nf_ct_l4proto_put(cur->l4proto);
|
|
|
|
if (refcount_dec_and_test(&cur->refcnt))
|
|
kfree_rcu(cur, rcu_head);
|
|
}
|
|
}
|
|
|
|
static struct pernet_operations cttimeout_ops = {
|
|
.init = cttimeout_net_init,
|
|
.exit = cttimeout_net_exit,
|
|
};
|
|
|
|
static int __init cttimeout_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_pernet_subsys(&cttimeout_ops);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = nfnetlink_subsys_register(&cttimeout_subsys);
|
|
if (ret < 0) {
|
|
pr_err("cttimeout_init: cannot register cttimeout with "
|
|
"nfnetlink.\n");
|
|
goto err_out;
|
|
}
|
|
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
|
|
RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get);
|
|
RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put);
|
|
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
|
|
return 0;
|
|
|
|
err_out:
|
|
unregister_pernet_subsys(&cttimeout_ops);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit cttimeout_exit(void)
|
|
{
|
|
nfnetlink_subsys_unregister(&cttimeout_subsys);
|
|
|
|
unregister_pernet_subsys(&cttimeout_ops);
|
|
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
|
|
RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL);
|
|
RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL);
|
|
synchronize_rcu();
|
|
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
|
|
}
|
|
|
|
module_init(cttimeout_init);
|
|
module_exit(cttimeout_exit);
|