diff options
Diffstat (limited to 'net/netfilter')
-rw-r--r-- | net/netfilter/ipvs/ip_vs_ctl.c | 30 | ||||
-rw-r--r-- | net/netfilter/ipvs/ip_vs_sync.c | 155 | ||||
-rw-r--r-- | net/netfilter/nf_conntrack_core.c | 39 | ||||
-rw-r--r-- | net/netfilter/nf_conntrack_helper.c | 26 | ||||
-rw-r--r-- | net/netfilter/nf_conntrack_netlink.c | 14 | ||||
-rw-r--r-- | net/netfilter/nf_nat_proto_common.c | 7 | ||||
-rw-r--r-- | net/netfilter/nft_dynset.c | 5 | ||||
-rw-r--r-- | net/netfilter/x_tables.c | 89 | ||||
-rw-r--r-- | net/netfilter/xt_CT.c | 11 | ||||
-rw-r--r-- | net/netfilter/xt_IDLETIMER.c | 9 | ||||
-rw-r--r-- | net/netfilter/xt_LED.c | 12 | ||||
-rw-r--r-- | net/netfilter/xt_hashlimit.c | 11 | ||||
-rw-r--r-- | net/netfilter/xt_recent.c | 6 |
13 files changed, 282 insertions, 132 deletions
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c index 2155c2498aed..c5f2350a2b50 100644 --- a/net/netfilter/ipvs/ip_vs_ctl.c +++ b/net/netfilter/ipvs/ip_vs_ctl.c @@ -2393,11 +2393,7 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) strlcpy(cfg.mcast_ifn, dm->mcast_ifn, sizeof(cfg.mcast_ifn)); cfg.syncid = dm->syncid; - rtnl_lock(); - mutex_lock(&ipvs->sync_mutex); ret = start_sync_thread(ipvs, &cfg, dm->state); - mutex_unlock(&ipvs->sync_mutex); - rtnl_unlock(); } else { mutex_lock(&ipvs->sync_mutex); ret = stop_sync_thread(ipvs, dm->state); @@ -3092,6 +3088,17 @@ nla_put_failure: return skb->len; } +static bool ip_vs_is_af_valid(int af) +{ + if (af == AF_INET) + return true; +#ifdef CONFIG_IP_VS_IPV6 + if (af == AF_INET6 && ipv6_mod_enabled()) + return true; +#endif + return false; +} + static int ip_vs_genl_parse_service(struct netns_ipvs *ipvs, struct ip_vs_service_user_kern *usvc, struct nlattr *nla, int full_entry, @@ -3118,11 +3125,7 @@ static int ip_vs_genl_parse_service(struct netns_ipvs *ipvs, memset(usvc, 0, sizeof(*usvc)); usvc->af = nla_get_u16(nla_af); -#ifdef CONFIG_IP_VS_IPV6 - if (usvc->af != AF_INET && usvc->af != AF_INET6) -#else - if (usvc->af != AF_INET) -#endif + if (!ip_vs_is_af_valid(usvc->af)) return -EAFNOSUPPORT; if (nla_fwmark) { @@ -3488,12 +3491,8 @@ static int ip_vs_genl_new_daemon(struct netns_ipvs *ipvs, struct nlattr **attrs) if (ipvs->mixed_address_family_dests > 0) return -EINVAL; - rtnl_lock(); - mutex_lock(&ipvs->sync_mutex); ret = start_sync_thread(ipvs, &c, nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE])); - mutex_unlock(&ipvs->sync_mutex); - rtnl_unlock(); return ret; } @@ -3624,6 +3623,11 @@ static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info) if (udest.af == 0) udest.af = svc->af; + if (!ip_vs_is_af_valid(udest.af)) { + ret = -EAFNOSUPPORT; + goto out; + } + if (udest.af != svc->af && cmd != IPVS_CMD_DEL_DEST) { /* The synchronization protocol is incompatible * with mixed family services diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c index 9350530c16c1..5fbf4b232592 100644 --- a/net/netfilter/ipvs/ip_vs_sync.c +++ b/net/netfilter/ipvs/ip_vs_sync.c @@ -48,6 +48,7 @@ #include <linux/kthread.h> #include <linux/wait.h> #include <linux/kernel.h> +#include <linux/sched.h> #include <asm/unaligned.h> /* Used for ntoh_seq and hton_seq */ @@ -1359,15 +1360,9 @@ static void set_mcast_pmtudisc(struct sock *sk, int val) /* * Specifiy default interface for outgoing multicasts */ -static int set_mcast_if(struct sock *sk, char *ifname) +static int set_mcast_if(struct sock *sk, struct net_device *dev) { - struct net_device *dev; struct inet_sock *inet = inet_sk(sk); - struct net *net = sock_net(sk); - - dev = __dev_get_by_name(net, ifname); - if (!dev) - return -ENODEV; if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if) return -EINVAL; @@ -1395,19 +1390,14 @@ static int set_mcast_if(struct sock *sk, char *ifname) * in the in_addr structure passed in as a parameter. */ static int -join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname) +join_mcast_group(struct sock *sk, struct in_addr *addr, struct net_device *dev) { - struct net *net = sock_net(sk); struct ip_mreqn mreq; - struct net_device *dev; int ret; memset(&mreq, 0, sizeof(mreq)); memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr)); - dev = __dev_get_by_name(net, ifname); - if (!dev) - return -ENODEV; if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if) return -EINVAL; @@ -1422,15 +1412,10 @@ join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname) #ifdef CONFIG_IP_VS_IPV6 static int join_mcast_group6(struct sock *sk, struct in6_addr *addr, - char *ifname) + struct net_device *dev) { - struct net *net = sock_net(sk); - struct net_device *dev; int ret; - dev = __dev_get_by_name(net, ifname); - if (!dev) - return -ENODEV; if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if) return -EINVAL; @@ -1442,24 +1427,18 @@ static int join_mcast_group6(struct sock *sk, struct in6_addr *addr, } #endif -static int bind_mcastif_addr(struct socket *sock, char *ifname) +static int bind_mcastif_addr(struct socket *sock, struct net_device *dev) { - struct net *net = sock_net(sock->sk); - struct net_device *dev; __be32 addr; struct sockaddr_in sin; - dev = __dev_get_by_name(net, ifname); - if (!dev) - return -ENODEV; - addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); if (!addr) pr_err("You probably need to specify IP address on " "multicast interface.\n"); IP_VS_DBG(7, "binding socket with (%s) %pI4\n", - ifname, &addr); + dev->name, &addr); /* Now bind the socket with the address of multicast interface */ sin.sin_family = AF_INET; @@ -1492,7 +1471,8 @@ static void get_mcast_sockaddr(union ipvs_sockaddr *sa, int *salen, /* * Set up sending multicast socket over UDP */ -static struct socket *make_send_sock(struct netns_ipvs *ipvs, int id) +static int make_send_sock(struct netns_ipvs *ipvs, int id, + struct net_device *dev, struct socket **sock_ret) { /* multicast addr */ union ipvs_sockaddr mcast_addr; @@ -1504,9 +1484,10 @@ static struct socket *make_send_sock(struct netns_ipvs *ipvs, int id) IPPROTO_UDP, &sock); if (result < 0) { pr_err("Error during creation of socket; terminating\n"); - return ERR_PTR(result); + goto error; } - result = set_mcast_if(sock->sk, ipvs->mcfg.mcast_ifn); + *sock_ret = sock; + result = set_mcast_if(sock->sk, dev); if (result < 0) { pr_err("Error setting outbound mcast interface\n"); goto error; @@ -1521,7 +1502,7 @@ static struct socket *make_send_sock(struct netns_ipvs *ipvs, int id) set_sock_size(sock->sk, 1, result); if (AF_INET == ipvs->mcfg.mcast_af) - result = bind_mcastif_addr(sock, ipvs->mcfg.mcast_ifn); + result = bind_mcastif_addr(sock, dev); else result = 0; if (result < 0) { @@ -1537,19 +1518,18 @@ static struct socket *make_send_sock(struct netns_ipvs *ipvs, int id) goto error; } - return sock; + return 0; error: - sock_release(sock); - return ERR_PTR(result); + return result; } /* * Set up receiving multicast socket over UDP */ -static struct socket *make_receive_sock(struct netns_ipvs *ipvs, int id, - int ifindex) +static int make_receive_sock(struct netns_ipvs *ipvs, int id, + struct net_device *dev, struct socket **sock_ret) { /* multicast addr */ union ipvs_sockaddr mcast_addr; @@ -1561,8 +1541,9 @@ static struct socket *make_receive_sock(struct netns_ipvs *ipvs, int id, IPPROTO_UDP, &sock); if (result < 0) { pr_err("Error during creation of socket; terminating\n"); - return ERR_PTR(result); + goto error; } + *sock_ret = sock; /* it is equivalent to the REUSEADDR option in user-space */ sock->sk->sk_reuse = SK_CAN_REUSE; result = sysctl_sync_sock_size(ipvs); @@ -1570,7 +1551,7 @@ static struct socket *make_receive_sock(struct netns_ipvs *ipvs, int id, set_sock_size(sock->sk, 0, result); get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->bcfg, id); - sock->sk->sk_bound_dev_if = ifindex; + sock->sk->sk_bound_dev_if = dev->ifindex; result = sock->ops->bind(sock, (struct sockaddr *)&mcast_addr, salen); if (result < 0) { pr_err("Error binding to the multicast addr\n"); @@ -1581,21 +1562,20 @@ static struct socket *make_receive_sock(struct netns_ipvs *ipvs, int id, #ifdef CONFIG_IP_VS_IPV6 if (ipvs->bcfg.mcast_af == AF_INET6) result = join_mcast_group6(sock->sk, &mcast_addr.in6.sin6_addr, - ipvs->bcfg.mcast_ifn); + dev); else #endif result = join_mcast_group(sock->sk, &mcast_addr.in.sin_addr, - ipvs->bcfg.mcast_ifn); + dev); if (result < 0) { pr_err("Error joining to the multicast group\n"); goto error; } - return sock; + return 0; error: - sock_release(sock); - return ERR_PTR(result); + return result; } @@ -1780,13 +1760,12 @@ static int sync_thread_backup(void *data) int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c, int state) { - struct ip_vs_sync_thread_data *tinfo; + struct ip_vs_sync_thread_data *tinfo = NULL; struct task_struct **array = NULL, *task; - struct socket *sock; struct net_device *dev; char *name; int (*threadfn)(void *data); - int id, count, hlen; + int id = 0, count, hlen; int result = -ENOMEM; u16 mtu, min_mtu; @@ -1794,6 +1773,18 @@ int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c, IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %Zd bytes\n", sizeof(struct ip_vs_sync_conn_v0)); + /* Do not hold one mutex and then to block on another */ + for (;;) { + rtnl_lock(); + if (mutex_trylock(&ipvs->sync_mutex)) + break; + rtnl_unlock(); + mutex_lock(&ipvs->sync_mutex); + if (rtnl_trylock()) + break; + mutex_unlock(&ipvs->sync_mutex); + } + if (!ipvs->sync_state) { count = clamp(sysctl_sync_ports(ipvs), 1, IPVS_SYNC_PORTS_MAX); ipvs->threads_mask = count - 1; @@ -1812,7 +1803,8 @@ int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c, dev = __dev_get_by_name(ipvs->net, c->mcast_ifn); if (!dev) { pr_err("Unknown mcast interface: %s\n", c->mcast_ifn); - return -ENODEV; + result = -ENODEV; + goto out_early; } hlen = (AF_INET6 == c->mcast_af) ? sizeof(struct ipv6hdr) + sizeof(struct udphdr) : @@ -1829,26 +1821,30 @@ int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c, c->sync_maxlen = mtu - hlen; if (state == IP_VS_STATE_MASTER) { + result = -EEXIST; if (ipvs->ms) - return -EEXIST; + goto out_early; ipvs->mcfg = *c; name = "ipvs-m:%d:%d"; threadfn = sync_thread_master; } else if (state == IP_VS_STATE_BACKUP) { + result = -EEXIST; if (ipvs->backup_threads) - return -EEXIST; + goto out_early; ipvs->bcfg = *c; name = "ipvs-b:%d:%d"; threadfn = sync_thread_backup; } else { - return -EINVAL; + result = -EINVAL; + goto out_early; } if (state == IP_VS_STATE_MASTER) { struct ipvs_master_sync_state *ms; + result = -ENOMEM; ipvs->ms = kzalloc(count * sizeof(ipvs->ms[0]), GFP_KERNEL); if (!ipvs->ms) goto out; @@ -1864,39 +1860,38 @@ int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c, } else { array = kzalloc(count * sizeof(struct task_struct *), GFP_KERNEL); + result = -ENOMEM; if (!array) goto out; } - tinfo = NULL; for (id = 0; id < count; id++) { - if (state == IP_VS_STATE_MASTER) - sock = make_send_sock(ipvs, id); - else - sock = make_receive_sock(ipvs, id, dev->ifindex); - if (IS_ERR(sock)) { - result = PTR_ERR(sock); - goto outtinfo; - } + result = -ENOMEM; tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL); if (!tinfo) - goto outsocket; + goto out; tinfo->ipvs = ipvs; - tinfo->sock = sock; + tinfo->sock = NULL; if (state == IP_VS_STATE_BACKUP) { tinfo->buf = kmalloc(ipvs->bcfg.sync_maxlen, GFP_KERNEL); if (!tinfo->buf) - goto outtinfo; + goto out; } else { tinfo->buf = NULL; } tinfo->id = id; + if (state == IP_VS_STATE_MASTER) + result = make_send_sock(ipvs, id, dev, &tinfo->sock); + else + result = make_receive_sock(ipvs, id, dev, &tinfo->sock); + if (result < 0) + goto out; task = kthread_run(threadfn, tinfo, name, ipvs->gen, id); if (IS_ERR(task)) { result = PTR_ERR(task); - goto outtinfo; + goto out; } tinfo = NULL; if (state == IP_VS_STATE_MASTER) @@ -1913,20 +1908,20 @@ int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c, ipvs->sync_state |= state; spin_unlock_bh(&ipvs->sync_buff_lock); + mutex_unlock(&ipvs->sync_mutex); + rtnl_unlock(); + /* increase the module use count */ ip_vs_use_count_inc(); return 0; -outsocket: - sock_release(sock); - -outtinfo: - if (tinfo) { - sock_release(tinfo->sock); - kfree(tinfo->buf); - kfree(tinfo); - } +out: + /* We do not need RTNL lock anymore, release it here so that + * sock_release below and in the kthreads can use rtnl_lock + * to leave the mcast group. + */ + rtnl_unlock(); count = id; while (count-- > 0) { if (state == IP_VS_STATE_MASTER) @@ -1934,13 +1929,23 @@ outtinfo: else kthread_stop(array[count]); } - kfree(array); - -out: if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) { kfree(ipvs->ms); ipvs->ms = NULL; } + mutex_unlock(&ipvs->sync_mutex); + if (tinfo) { + if (tinfo->sock) + sock_release(tinfo->sock); + kfree(tinfo->buf); + kfree(tinfo); + } + kfree(array); + return result; + +out_early: + mutex_unlock(&ipvs->sync_mutex); + rtnl_unlock(); return result; } diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index 750b8bf13e60..2039fd7daf4e 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -1542,7 +1542,6 @@ get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), struct nf_conntrack_tuple_hash *h; struct nf_conn *ct; struct hlist_nulls_node *n; - int cpu; spinlock_t *lockp; for (; *bucket < nf_conntrack_htable_size; (*bucket)++) { @@ -1564,24 +1563,40 @@ get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), cond_resched(); } + return NULL; +found: + atomic_inc(&ct->ct_general.use); + spin_unlock(lockp); + local_bh_enable(); + return ct; +} + +static void +__nf_ct_unconfirmed_destroy(struct net *net) +{ + int cpu; + for_each_possible_cpu(cpu) { - struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); + struct nf_conntrack_tuple_hash *h; + struct hlist_nulls_node *n; + struct ct_pcpu *pcpu; + + pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); spin_lock_bh(&pcpu->lock); hlist_nulls_for_each_entry(h, n, &pcpu->unconfirmed, hnnode) { + struct nf_conn *ct; + ct = nf_ct_tuplehash_to_ctrack(h); - if (iter(ct, data)) - set_bit(IPS_DYING_BIT, &ct->status); + + /* we cannot call iter() on unconfirmed list, the + * owning cpu can reallocate ct->ext at any time. + */ + set_bit(IPS_DYING_BIT, &ct->status); } spin_unlock_bh(&pcpu->lock); cond_resched(); } - return NULL; -found: - atomic_inc(&ct->ct_general.use); - spin_unlock(lockp); - local_bh_enable(); - return ct; } void nf_ct_iterate_cleanup(struct net *net, @@ -1596,6 +1611,10 @@ void nf_ct_iterate_cleanup(struct net *net, if (atomic_read(&net->ct.count) == 0) return; + __nf_ct_unconfirmed_destroy(net); + + synchronize_net(); + while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { /* Time to push up daises... */ diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c index 6dc44d9b4190..92e69af41656 100644 --- a/net/netfilter/nf_conntrack_helper.c +++ b/net/netfilter/nf_conntrack_helper.c @@ -379,17 +379,33 @@ int nf_conntrack_helper_register(struct nf_conntrack_helper *me) struct nf_conntrack_tuple_mask mask = { .src.u.all = htons(0xFFFF) }; unsigned int h = helper_hash(&me->tuple); struct nf_conntrack_helper *cur; - int ret = 0; + int ret = 0, i; BUG_ON(me->expect_policy == NULL); BUG_ON(me->expect_class_max >= NF_CT_MAX_EXPECT_CLASSES); BUG_ON(strlen(me->name) > NF_CT_HELPER_NAME_LEN - 1); mutex_lock(&nf_ct_helper_mutex); - hlist_for_each_entry(cur, &nf_ct_helper_hash[h], hnode) { - if (nf_ct_tuple_src_mask_cmp(&cur->tuple, &me->tuple, &mask)) { - ret = -EEXIST; - goto out; + for (i = 0; i < nf_ct_helper_hsize; i++) { + hlist_for_each_entry(cur, &nf_ct_helper_hash[i], hnode) { + if (!strcmp(cur->name, me->name) && + (cur->tuple.src.l3num == NFPROTO_UNSPEC || + cur->tuple.src.l3num == me->tuple.src.l3num) && + cur->tuple.dst.protonum == me->tuple.dst.protonum) { + ret = -EEXIST; + goto out; + } + } + } + + /* avoid unpredictable behaviour for auto_assign_helper */ + if (!(me->flags & NF_CT_HELPER_F_USERSPACE)) { + hlist_for_each_entry(cur, &nf_ct_helper_hash[h], hnode) { + if (nf_ct_tuple_src_mask_cmp(&cur->tuple, &me->tuple, + &mask)) { + ret = -EEXIST; + goto out; + } } } hlist_add_head_rcu(&me->hnode, &nf_ct_helper_hash[h]); diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index d5caed5bcfb1..9e30fd0ab227 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -890,8 +890,13 @@ restart: } out: local_bh_enable(); - if (last) + if (last) { + /* nf ct hash resize happened, now clear the leftover. */ + if ((struct nf_conn *)cb->args[1] == last) + cb->args[1] = 0; + nf_ct_put(last); + } while (i) { i--; @@ -1008,9 +1013,8 @@ static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = { static int ctnetlink_parse_tuple(const struct nlattr * const cda[], - struct nf_conntrack_tuple *tuple, - enum ctattr_type type, u_int8_t l3num, - struct nf_conntrack_zone *zone) + struct nf_conntrack_tuple *tuple, u32 type, + u_int8_t l3num, struct nf_conntrack_zone *zone) { struct nlattr *tb[CTA_TUPLE_MAX+1]; int err; @@ -2409,7 +2413,7 @@ static struct nfnl_ct_hook ctnetlink_glue_hook = { static int ctnetlink_exp_dump_tuple(struct sk_buff *skb, const struct nf_conntrack_tuple *tuple, - enum ctattr_expect type) + u32 type) { struct nlattr *nest_parms; diff --git a/net/netfilter/nf_nat_proto_common.c b/net/netfilter/nf_nat_proto_common.c index fbce552a796e..7d7466dbf663 100644 --- a/net/netfilter/nf_nat_proto_common.c +++ b/net/netfilter/nf_nat_proto_common.c @@ -41,7 +41,7 @@ void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto, const struct nf_conn *ct, u16 *rover) { - unsigned int range_size, min, i; + unsigned int range_size, min, max, i; __be16 *portptr; u_int16_t off; @@ -71,7 +71,10 @@ void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto, } } else { min = ntohs(range->min_proto.all); - range_size = ntohs(range->max_proto.all) - min + 1; + max = ntohs(range->max_proto.all); + if (unlikely(max < min)) + swap(max, min); + range_size = max - min + 1; } if (range->flags & NF_NAT_RANGE_PROTO_RANDOM) { diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c index 31ca94793aa9..b9dd4e960426 100644 --- a/net/netfilter/nft_dynset.c +++ b/net/netfilter/nft_dynset.c @@ -82,8 +82,7 @@ static void nft_dynset_eval(const struct nft_expr *expr, nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { timeout = priv->timeout ? : set->timeout; *nft_set_ext_expiration(ext) = jiffies + timeout; - } else if (sexpr == NULL) - goto out; + } if (sexpr != NULL) sexpr->ops->eval(sexpr, regs, pkt); @@ -92,7 +91,7 @@ static void nft_dynset_eval(const struct nft_expr *expr, regs->verdict.code = NFT_BREAK; return; } -out: + if (!priv->invert) regs->verdict.code = NFT_BREAK; } diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c index e47ade305a46..59be89813a29 100644 --- a/net/netfilter/x_tables.c +++ b/net/netfilter/x_tables.c @@ -39,6 +39,8 @@ MODULE_LICENSE("GPL"); MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); MODULE_DESCRIPTION("{ip,ip6,arp,eb}_tables backend module"); +#define XT_PCPU_BLOCK_SIZE 4096 + struct compat_delta { unsigned int offset; /* offset in kernel */ int delta; /* delta in 32bit user land */ @@ -365,6 +367,36 @@ textify_hooks(char *buf, size_t size, unsigned int mask, uint8_t nfproto) return buf; } +/** + * xt_check_proc_name - check that name is suitable for /proc file creation + * + * @name: file name candidate + * @size: length of buffer + * + * some x_tables modules wish to create a file in /proc. + * This function makes sure that the name is suitable for this + * purpose, it checks that name is NUL terminated and isn't a 'special' + * name, like "..". + * + * returns negative number on error or 0 if name is useable. + */ +int xt_check_proc_name(const char *name, unsigned int size) +{ + if (name[0] == '\0') + return -EINVAL; + + if (strnlen(name, size) == size) + return -ENAMETOOLONG; + + if (strcmp(name, ".") == 0 || + strcmp(name, "..") == 0 || + strchr(name, '/')) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL(xt_check_proc_name); + int xt_check_match(struct xt_mtchk_param *par, unsigned int size, u_int8_t proto, bool inv_proto) { @@ -1004,8 +1036,10 @@ struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af, list_for_each_entry(t, &init_net.xt.tables[af], list) { if (strcmp(t->name, name)) continue; - if (!try_module_get(t->me)) + if (!try_module_get(t->me)) { + mutex_unlock(&xt[af].mutex); return NULL; + } mutex_unlock(&xt[af].mutex); if (t->table_init(net) != 0) { @@ -1619,6 +1653,59 @@ void xt_proto_fini(struct net *net, u_int8_t af) } EXPORT_SYMBOL_GPL(xt_proto_fini); +/** + * xt_percpu_counter_alloc - allocate x_tables rule counter + * + * @state: pointer to xt_percpu allocation state + * @counter: pointer to counter struct inside the ip(6)/arpt_entry struct + * + * On SMP, the packet counter [ ip(6)t_entry->counters.pcnt ] will then + * contain the address of the real (percpu) counter. + * + * Rule evaluation needs to use xt_get_this_cpu_counter() helper + * to fetch the real percpu counter. + * + * To speed up allocation and improve data locality, a 4kb block is + * allocated. + * + * xt_percpu_counter_alloc_state contains the base address of the + * allocated page and the current sub-offset. + * + * returns false on error. + */ +bool xt_percpu_counter_alloc(struct xt_percpu_counter_alloc_state *state, + struct xt_counters *counter) +{ + BUILD_BUG_ON(XT_PCPU_BLOCK_SIZE < (sizeof(*counter) * 2)); + + if (nr_cpu_ids <= 1) + return true; + + if (!state->mem) { + state->mem = __alloc_percpu(XT_PCPU_BLOCK_SIZE, + XT_PCPU_BLOCK_SIZE); + if (!state->mem) + return false; + } + counter->pcnt = (__force unsigned long)(state->mem + state->off); + state->off += sizeof(*counter); + if (state->off > (XT_PCPU_BLOCK_SIZE - sizeof(*counter))) { + state->mem = NULL; + state->off = 0; + } + return true; +} +EXPORT_SYMBOL_GPL(xt_percpu_counter_alloc); + +void xt_percpu_counter_free(struct xt_counters *counters) +{ + unsigned long pcnt = counters->pcnt; + + if (nr_cpu_ids > 1 && (pcnt & (XT_PCPU_BLOCK_SIZE - 1)) == 0) + free_percpu((void __percpu *)pcnt); +} +EXPORT_SYMBOL_GPL(xt_percpu_counter_free); + static int __net_init xt_net_init(struct net *net) { int i; diff --git a/net/netfilter/xt_CT.c b/net/netfilter/xt_CT.c index 6669e68d589e..00ef8243d48d 100644 --- a/net/netfilter/xt_CT.c +++ b/net/netfilter/xt_CT.c @@ -168,8 +168,10 @@ xt_ct_set_timeout(struct nf_conn *ct, const struct xt_tgchk_param *par, goto err_put_timeout; } timeout_ext = nf_ct_timeout_ext_add(ct, timeout, GFP_ATOMIC); - if (timeout_ext == NULL) + if (!timeout_ext) { ret = -ENOMEM; + goto err_put_timeout; + } rcu_read_unlock(); return ret; @@ -201,6 +203,7 @@ static int xt_ct_tg_check(const struct xt_tgchk_param *par, struct xt_ct_target_info_v1 *info) { struct nf_conntrack_zone zone; + struct nf_conn_help *help; struct nf_conn *ct; int ret = -EOPNOTSUPP; @@ -249,7 +252,7 @@ static int xt_ct_tg_check(const struct xt_tgchk_param *par, if (info->timeout[0]) { ret = xt_ct_set_timeout(ct, par, info->timeout); if (ret < 0) - goto err3; + goto err4; } __set_bit(IPS_CONFIRMED_BIT, &ct->status); nf_conntrack_get(&ct->ct_general); @@ -257,6 +260,10 @@ out: info->ct = ct; return 0; +err4: + help = nfct_help(ct); + if (help) + module_put(help->helper->me); err3: nf_ct_tmpl_free(ct); err2: diff --git a/net/netfilter/xt_IDLETIMER.c b/net/netfilter/xt_IDLETIMER.c index daf45da448fa..bb5d6a058fb7 100644 --- a/net/netfilter/xt_IDLETIMER.c +++ b/net/netfilter/xt_IDLETIMER.c @@ -147,11 +147,11 @@ static int idletimer_tg_create(struct idletimer_tg_info *info) (unsigned long) info->timer); info->timer->refcnt = 1; + INIT_WORK(&info->timer->work, idletimer_tg_work); + mod_timer(&info->timer->timer, msecs_to_jiffies(info->timeout * 1000) + jiffies); - INIT_WORK(&info->timer->work, idletimer_tg_work); - return 0; out_free_attr: @@ -192,7 +192,10 @@ static int idletimer_tg_checkentry(const struct xt_tgchk_param *par) pr_debug("timeout value is zero\n"); return -EINVAL; } - + if (info->timeout >= INT_MAX / 1000) { + pr_debug("timeout value is too big\n"); + return -EINVAL; + } if (info->label[0] == '\0' || strnlen(info->label, MAX_IDLETIMER_LABEL_SIZE) == MAX_IDLETIMER_LABEL_SIZE) { diff --git a/net/netfilter/xt_LED.c b/net/netfilter/xt_LED.c index 3ba31c194cce..0858fe17e14a 100644 --- a/net/netfilter/xt_LED.c +++ b/net/netfilter/xt_LED.c @@ -141,10 +141,11 @@ static int led_tg_check(const struct xt_tgchk_param *par) goto exit_alloc; } - /* See if we need to set up a timer */ - if (ledinfo->delay > 0) - setup_timer(&ledinternal->timer, led_timeout_callback, - (unsigned long)ledinternal); + /* Since the letinternal timer can be shared between multiple targets, + * always set it up, even if the current target does not need it + */ + setup_timer(&ledinternal->timer, led_timeout_callback, + (unsigned long)ledinternal); list_add_tail(&ledinternal->list, &xt_led_triggers); @@ -181,8 +182,7 @@ static void led_tg_destroy(const struct xt_tgdtor_param *par) list_del(&ledinternal->list); - if (ledinfo->delay > 0) - del_timer_sync(&ledinternal->timer); + del_timer_sync(&ledinternal->timer); led_trigger_unregister(&ledinternal->netfilter_led_trigger); diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c index b89b688e9d01..a1a29cdc58fc 100644 --- a/net/netfilter/xt_hashlimit.c +++ b/net/netfilter/xt_hashlimit.c @@ -794,8 +794,9 @@ static int hashlimit_mt_check_v1(const struct xt_mtchk_param *par) struct hashlimit_cfg2 cfg = {}; int ret; - if (info->name[sizeof(info->name) - 1] != '\0') - return -EINVAL; + ret = xt_check_proc_name(info->name, sizeof(info->name)); + if (ret) + return ret; ret = cfg_copy(&cfg, (void *)&info->cfg, 1); @@ -809,9 +810,11 @@ static int hashlimit_mt_check_v1(const struct xt_mtchk_param *par) static int hashlimit_mt_check(const struct xt_mtchk_param *par) { struct xt_hashlimit_mtinfo2 *info = par->matchinfo; + int ret; - if (info->name[sizeof(info->name) - 1] != '\0') - return -EINVAL; + ret = xt_check_proc_name(info->name, sizeof(info->name)); + if (ret) + return ret; return hashlimit_mt_check_common(par, &info->hinfo, &info->cfg, info->name, 2); diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c index e3b7a09b103e..79d7ad621a80 100644 --- a/net/netfilter/xt_recent.c +++ b/net/netfilter/xt_recent.c @@ -361,9 +361,9 @@ static int recent_mt_check(const struct xt_mtchk_param *par, info->hit_count, XT_RECENT_MAX_NSTAMPS - 1); return -EINVAL; } - if (info->name[0] == '\0' || - strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN) - return -EINVAL; + ret = xt_check_proc_name(info->name, sizeof(info->name)); + if (ret) + return ret; if (ip_pkt_list_tot && info->hit_count < ip_pkt_list_tot) nstamp_mask = roundup_pow_of_two(ip_pkt_list_tot) - 1; |