net: add Intermediate Queueing Device (imq) From: Jussi Kivilinna This patch is for kernel version 3.12.4+. See: http://linuximq.net/ Signed-off-by: Jussi Kivilinna --- drivers/net/Kconfig | 119 ++++ drivers/net/Makefile | 1 drivers/net/imq.c | 1007 +++++++++++++++++++++++++++++++ include/linux/imq.h | 13 include/linux/netfilter/xt_IMQ.h | 9 include/linux/netfilter_ipv4/ipt_IMQ.h | 10 include/linux/netfilter_ipv6/ip6t_IMQ.h | 10 include/linux/skbuff.h | 22 + include/net/netfilter/nf_queue.h | 6 include/uapi/linux/netfilter.h | 3 net/core/dev.c | 8 net/core/skbuff.c | 112 +++ net/ipv6/ip6_output.c | 10 net/netfilter/Kconfig | 12 net/netfilter/Makefile | 1 net/netfilter/core.c | 6 net/netfilter/nf_internals.h | 2 net/netfilter/nf_queue.c | 36 + net/netfilter/xt_IMQ.c | 72 ++ 19 files changed, 1449 insertions(+), 10 deletions(-) create mode 100644 drivers/net/imq.c create mode 100644 include/linux/imq.h create mode 100644 include/linux/netfilter/xt_IMQ.h create mode 100644 include/linux/netfilter_ipv4/ipt_IMQ.h create mode 100644 include/linux/netfilter_ipv6/ip6t_IMQ.h create mode 100644 net/netfilter/xt_IMQ.c diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index b45b240..5a20da0 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -203,6 +203,125 @@ config RIONET_RX_SIZE depends on RIONET default "128" +config IMQ + tristate "IMQ (intermediate queueing device) support" + depends on NETDEVICES && NETFILTER + ---help--- + The IMQ device(s) is used as placeholder for QoS queueing + disciplines. Every packet entering/leaving the IP stack can be + directed through the IMQ device where it's enqueued/dequeued to the + attached qdisc. This allows you to treat network devices as classes + and distribute bandwidth among them. Iptables is used to specify + through which IMQ device, if any, packets travel. + + More information at: http://www.linuximq.net/ + + To compile this driver as a module, choose M here: the module + will be called imq. If unsure, say N. + +choice + prompt "IMQ behavior (PRE/POSTROUTING)" + depends on IMQ + default IMQ_BEHAVIOR_AB + help + This setting defines how IMQ behaves in respect to its + hooking in PREROUTING and POSTROUTING. + + IMQ can work in any of the following ways: + + PREROUTING | POSTROUTING + -----------------|------------------- + #1 After NAT | After NAT + #2 After NAT | Before NAT + #3 Before NAT | After NAT + #4 Before NAT | Before NAT + + The default behavior is to hook before NAT on PREROUTING + and after NAT on POSTROUTING (#3). + + This settings are specially usefull when trying to use IMQ + to shape NATed clients. + + More information can be found at: www.linuximq.net + + If not sure leave the default settings alone. + +config IMQ_BEHAVIOR_AA + bool "IMQ AA" + help + This setting defines how IMQ behaves in respect to its + hooking in PREROUTING and POSTROUTING. + + Choosing this option will make IMQ hook like this: + + PREROUTING: After NAT + POSTROUTING: After NAT + + More information can be found at: www.linuximq.net + + If not sure leave the default settings alone. + +config IMQ_BEHAVIOR_AB + bool "IMQ AB" + help + This setting defines how IMQ behaves in respect to its + hooking in PREROUTING and POSTROUTING. + + Choosing this option will make IMQ hook like this: + + PREROUTING: After NAT + POSTROUTING: Before NAT + + More information can be found at: www.linuximq.net + + If not sure leave the default settings alone. + +config IMQ_BEHAVIOR_BA + bool "IMQ BA" + help + This setting defines how IMQ behaves in respect to its + hooking in PREROUTING and POSTROUTING. + + Choosing this option will make IMQ hook like this: + + PREROUTING: Before NAT + POSTROUTING: After NAT + + More information can be found at: www.linuximq.net + + If not sure leave the default settings alone. + +config IMQ_BEHAVIOR_BB + bool "IMQ BB" + help + This setting defines how IMQ behaves in respect to its + hooking in PREROUTING and POSTROUTING. + + Choosing this option will make IMQ hook like this: + + PREROUTING: Before NAT + POSTROUTING: Before NAT + + More information can be found at: www.linuximq.net + + If not sure leave the default settings alone. + +endchoice + +config IMQ_NUM_DEVS + int "Number of IMQ devices" + range 2 16 + depends on IMQ + default "16" + help + This setting defines how many IMQ devices will be created. + + The default value is 16. + + More information can be found at: www.linuximq.net + + If not sure leave the default settings alone. + config TUN tristate "Universal TUN/TAP device driver support" select CRC32 diff --git a/drivers/net/Makefile b/drivers/net/Makefile index 3fef8a8..12dafc0 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_BONDING) += bonding/ obj-$(CONFIG_DUMMY) += dummy.o obj-$(CONFIG_EQUALIZER) += eql.o obj-$(CONFIG_IFB) += ifb.o +obj-$(CONFIG_IMQ) += imq.o obj-$(CONFIG_MACVLAN) += macvlan.o obj-$(CONFIG_MACVTAP) += macvtap.o obj-$(CONFIG_MII) += mii.o diff --git a/drivers/net/imq.c b/drivers/net/imq.c new file mode 100644 index 0000000..801bc8c --- /dev/null +++ b/drivers/net/imq.c @@ -0,0 +1,1012 @@ +/* + * Pseudo-driver for the intermediate queue device. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Authors: Patrick McHardy, + * + * The first version was written by Martin Devera, + * + * Credits: Jan Rafaj + * - Update patch to 2.4.21 + * Sebastian Strollo + * - Fix "Dead-loop on netdevice imq"-issue + * Marcel Sebek + * - Update to 2.6.2-rc1 + * + * After some time of inactivity there is a group taking care + * of IMQ again: http://www.linuximq.net + * + * + * 2004/06/30 - New version of IMQ patch to kernels <=2.6.7 + * including the following changes: + * + * - Correction of ipv6 support "+"s issue (Hasso Tepper) + * - Correction of imq_init_devs() issue that resulted in + * kernel OOPS unloading IMQ as module (Norbert Buchmuller) + * - Addition of functionality to choose number of IMQ devices + * during kernel config (Andre Correa) + * - Addition of functionality to choose how IMQ hooks on + * PRE and POSTROUTING (after or before NAT) (Andre Correa) + * - Cosmetic corrections (Norbert Buchmuller) (Andre Correa) + * + * + * 2005/12/16 - IMQ versions between 2.6.7 and 2.6.13 were + * released with almost no problems. 2.6.14-x was released + * with some important changes: nfcache was removed; After + * some weeks of trouble we figured out that some IMQ fields + * in skb were missing in skbuff.c - skb_clone and copy_skb_header. + * These functions are correctly patched by this new patch version. + * + * Thanks for all who helped to figure out all the problems with + * 2.6.14.x: Patrick McHardy, Rune Kock, VeNoMouS, Max CtRiX, + * Kevin Shanahan, Richard Lucassen, Valery Dachev (hopefully + * I didn't forget anybody). I apologize again for my lack of time. + * + * + * 2008/06/17 - 2.6.25 - Changed imq.c to use qdisc_run() instead + * of qdisc_restart() and moved qdisc_run() to tasklet to avoid + * recursive locking. New initialization routines to fix 'rmmod' not + * working anymore. Used code from ifb.c. (Jussi Kivilinna) + * + * 2008/08/06 - 2.6.26 - (JK) + * - Replaced tasklet with 'netif_schedule()'. + * - Cleaned up and added comments for imq_nf_queue(). + * + * 2009/04/12 + * - Add skb_save_cb/skb_restore_cb helper functions for backuping + * control buffer. This is needed because qdisc-layer on kernels + * 2.6.27 and newer overwrite control buffer. (Jussi Kivilinna) + * - Add better locking for IMQ device. Hopefully this will solve + * SMP issues. (Jussi Kivilinna) + * - Port to 2.6.27 + * - Port to 2.6.28 + * - Port to 2.6.29 + fix rmmod not working + * + * 2009/04/20 - (Jussi Kivilinna) + * - Use netdevice feature flags to avoid extra packet handling + * by core networking layer and possibly increase performance. + * + * 2009/09/26 - (Jussi Kivilinna) + * - Add imq_nf_reinject_lockless to fix deadlock with + * imq_nf_queue/imq_nf_reinject. + * + * 2009/12/08 - (Jussi Kivilinna) + * - Port to 2.6.32 + * - Add check for skb->nf_queue_entry==NULL in imq_dev_xmit() + * - Also add better error checking for skb->nf_queue_entry usage + * + * 2010/02/25 - (Jussi Kivilinna) + * - Port to 2.6.33 + * + * 2010/08/15 - (Jussi Kivilinna) + * - Port to 2.6.35 + * - Simplify hook registration by using nf_register_hooks. + * - nf_reinject doesn't need spinlock around it, therefore remove + * imq_nf_reinject function. Other nf_reinject users protect + * their own data with spinlock. With IMQ however all data is + * needed is stored per skbuff, so no locking is needed. + * - Changed IMQ to use 'separate' NF_IMQ_QUEUE instead of + * NF_QUEUE, this allows working coexistance of IMQ and other + * NF_QUEUE users. + * - Make IMQ multi-queue. Number of IMQ device queues can be + * increased with 'numqueues' module parameters. Default number + * of queues is 1, in other words by default IMQ works as + * single-queue device. Multi-queue selection is based on + * IFB multi-queue patch by Changli Gao . + * + * 2011/03/18 - (Jussi Kivilinna) + * - Port to 2.6.38 + * + * 2011/07/12 - (syoder89@gmail.com) + * - Crash fix that happens when the receiving interface has more + * than one queue (add missing skb_set_queue_mapping in + * imq_select_queue). + * + * 2011/07/26 - (Jussi Kivilinna) + * - Add queue mapping checks for packets exiting IMQ. + * - Port to 3.0 + * + * 2011/08/16 - (Jussi Kivilinna) + * - Clear IFF_TX_SKB_SHARING flag that was added for linux 3.0.2 + * + * 2011/11/03 - Germano Michel + * - Fix IMQ for net namespaces + * + * 2011/11/04 - Jussi Kivilinna + * - Port to 3.1 + * - Clean-up, move 'get imq device pointer by imqX name' to + * separate function from imq_nf_queue(). + * + * 2012/01/05 - Jussi Kivilinna + * - Port to 3.2 + * + * 2012/03/19 - Jussi Kivilinna + * - Port to 3.3 + * + * 2012/12/12 - Jussi Kivilinna + * - Port to 3.7 + * - Fix checkpatch.pl warnings + * + * 2013/09/10 - Jussi Kivilinna + * - Fixed GSO handling for 3.10, see imq_nf_queue() for comments. + * - Don't copy skb->cb_next when copying or cloning skbuffs. + * + * 2013/09/16 - Jussi Kivilinna + * - Port to 3.11 + * + * 2013/11/12 - Jussi Kivilinna + * - Port to 3.12 + * + * Also, many thanks to pablo Sebastian Greco for making the initial + * patch and to those who helped the testing. + * + * More info at: http://www.linuximq.net/ (Andre Correa) + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + #include +#endif +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int imq_nf_queue(struct nf_queue_entry *entry, unsigned queue_num); + +static unsigned int imq_nf_hook(const struct nf_hook_ops *ops, + struct sk_buff *pskb, + const struct net_device *indev, + const struct net_device *outdev, + int (*okfn)(struct sk_buff *)); + +static struct nf_hook_ops imq_ops[] = { + { + /* imq_ingress_ipv4 */ + .hook = imq_nf_hook, + .owner = THIS_MODULE, + .pf = PF_INET, + .hooknum = NF_INET_PRE_ROUTING, +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) + .priority = NF_IP_PRI_MANGLE + 1, +#else + .priority = NF_IP_PRI_NAT_DST + 1, +#endif + }, + { + /* imq_egress_ipv4 */ + .hook = imq_nf_hook, + .owner = THIS_MODULE, + .pf = PF_INET, + .hooknum = NF_INET_POST_ROUTING, +#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA) + .priority = NF_IP_PRI_LAST, +#else + .priority = NF_IP_PRI_NAT_SRC - 1, +#endif + }, +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + { + /* imq_ingress_ipv6 */ + .hook = imq_nf_hook, + .owner = THIS_MODULE, + .pf = PF_INET6, + .hooknum = NF_INET_PRE_ROUTING, +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) + .priority = NF_IP6_PRI_MANGLE + 1, +#else + .priority = NF_IP6_PRI_NAT_DST + 1, +#endif + }, + { + /* imq_egress_ipv6 */ + .hook = imq_nf_hook, + .owner = THIS_MODULE, + .pf = PF_INET6, + .hooknum = NF_INET_POST_ROUTING, +#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA) + .priority = NF_IP6_PRI_LAST, +#else + .priority = NF_IP6_PRI_NAT_SRC - 1, +#endif + }, +#endif +}; + +#if defined(CONFIG_IMQ_NUM_DEVS) +static int numdevs = CONFIG_IMQ_NUM_DEVS; +#else +static int numdevs = IMQ_MAX_DEVS; +#endif + +static struct net_device *imq_devs_cache[IMQ_MAX_DEVS]; + +#define IMQ_MAX_QUEUES 32 +static int numqueues = 1; +static u32 imq_hashrnd; + +static inline __be16 pppoe_proto(const struct sk_buff *skb) +{ + return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + + sizeof(struct pppoe_hdr))); +} + +static u16 imq_hash(struct net_device *dev, struct sk_buff *skb) +{ + unsigned int pull_len; + u16 protocol = skb->protocol; + u32 addr1, addr2; + u32 hash, ihl = 0; + union { + u16 in16[2]; + u32 in32; + } ports; + u8 ip_proto; + + pull_len = 0; + +recheck: + switch (protocol) { + case htons(ETH_P_8021Q): { + if (unlikely(skb_pull(skb, VLAN_HLEN) == NULL)) + goto other; + + pull_len += VLAN_HLEN; + skb->network_header += VLAN_HLEN; + + protocol = vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; + goto recheck; + } + + case htons(ETH_P_PPP_SES): { + if (unlikely(skb_pull(skb, PPPOE_SES_HLEN) == NULL)) + goto other; + + pull_len += PPPOE_SES_HLEN; + skb->network_header += PPPOE_SES_HLEN; + + protocol = pppoe_proto(skb); + goto recheck; + } + + case htons(ETH_P_IP): { + const struct iphdr *iph = ip_hdr(skb); + + if (unlikely(!pskb_may_pull(skb, sizeof(struct iphdr)))) + goto other; + + addr1 = iph->daddr; + addr2 = iph->saddr; + + ip_proto = !(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) ? + iph->protocol : 0; + ihl = ip_hdrlen(skb); + + break; + } +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + case htons(ETH_P_IPV6): { + const struct ipv6hdr *iph = ipv6_hdr(skb); + __be16 fo = 0; + + if (unlikely(!pskb_may_pull(skb, sizeof(struct ipv6hdr)))) + goto other; + + addr1 = iph->daddr.s6_addr32[3]; + addr2 = iph->saddr.s6_addr32[3]; + ihl = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &ip_proto, + &fo); + if (unlikely(ihl < 0)) + goto other; + + break; + } +#endif + default: +other: + if (pull_len != 0) { + skb_push(skb, pull_len); + skb->network_header -= pull_len; + } + + return (u16)(ntohs(protocol) % dev->real_num_tx_queues); + } + + if (addr1 > addr2) + swap(addr1, addr2); + + switch (ip_proto) { + case IPPROTO_TCP: + case IPPROTO_UDP: + case IPPROTO_DCCP: + case IPPROTO_ESP: + case IPPROTO_AH: + case IPPROTO_SCTP: + case IPPROTO_UDPLITE: { + if (likely(skb_copy_bits(skb, ihl, &ports.in32, 4) >= 0)) { + if (ports.in16[0] > ports.in16[1]) + swap(ports.in16[0], ports.in16[1]); + break; + } + /* fall-through */ + } + default: + ports.in32 = 0; + break; + } + + if (pull_len != 0) { + skb_push(skb, pull_len); + skb->network_header -= pull_len; + } + + hash = jhash_3words(addr1, addr2, ports.in32, imq_hashrnd ^ ip_proto); + + return (u16)(((u64)hash * dev->real_num_tx_queues) >> 32); +} + +static inline bool sk_tx_queue_recorded(struct sock *sk) +{ + return (sk_tx_queue_get(sk) >= 0); +} + +static struct netdev_queue *imq_select_queue(struct net_device *dev, + struct sk_buff *skb) +{ + u16 queue_index = 0; + u32 hash; + + if (likely(dev->real_num_tx_queues == 1)) + goto out; + + /* IMQ can be receiving ingress or engress packets. */ + + /* Check first for if rx_queue is set */ + if (skb_rx_queue_recorded(skb)) { + queue_index = skb_get_rx_queue(skb); + goto out; + } + + /* Check if socket has tx_queue set */ + if (sk_tx_queue_recorded(skb->sk)) { + queue_index = sk_tx_queue_get(skb->sk); + goto out; + } + + /* Try use socket hash */ + if (skb->sk && skb->sk->sk_hash) { + hash = skb->sk->sk_hash; + queue_index = + (u16)(((u64)hash * dev->real_num_tx_queues) >> 32); + goto out; + } + + /* Generate hash from packet data */ + queue_index = imq_hash(dev, skb); + +out: + if (unlikely(queue_index >= dev->real_num_tx_queues)) + queue_index = (u16)((u32)queue_index % dev->real_num_tx_queues); + + skb_set_queue_mapping(skb, queue_index); + return netdev_get_tx_queue(dev, queue_index); +} + +static struct net_device_stats *imq_get_stats(struct net_device *dev) +{ + return &dev->stats; +} + +/* called for packets kfree'd in qdiscs at places other than enqueue */ +static void imq_skb_destructor(struct sk_buff *skb) +{ + struct nf_queue_entry *entry = skb->nf_queue_entry; + + skb->nf_queue_entry = NULL; + + if (entry) { + nf_queue_entry_release_refs(entry); + kfree(entry); + } + + skb_restore_cb(skb); /* kfree backup */ +} + +static void imq_done_check_queue_mapping(struct sk_buff *skb, + struct net_device *dev) +{ + unsigned int queue_index; + + /* Don't let queue_mapping be left too large after exiting IMQ */ + if (likely(skb->dev != dev && skb->dev != NULL)) { + queue_index = skb_get_queue_mapping(skb); + if (unlikely(queue_index >= skb->dev->real_num_tx_queues)) { + queue_index = (u16)((u32)queue_index % + skb->dev->real_num_tx_queues); + skb_set_queue_mapping(skb, queue_index); + } + } else { + /* skb->dev was IMQ device itself or NULL, be on safe side and + * just clear queue mapping. + */ + skb_set_queue_mapping(skb, 0); + } +} + +static netdev_tx_t imq_dev_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct nf_queue_entry *entry = skb->nf_queue_entry; + + skb->nf_queue_entry = NULL; + dev->trans_start = jiffies; + + dev->stats.tx_bytes += skb->len; + dev->stats.tx_packets++; + + if (unlikely(entry == NULL)) { + /* We don't know what is going on here.. packet is queued for + * imq device, but (probably) not by us. + * + * If this packet was not send here by imq_nf_queue(), then + * skb_save_cb() was not used and skb_free() should not show: + * WARNING: IMQ: kfree_skb: skb->cb_next:.. + * and/or + * WARNING: IMQ: kfree_skb: skb->nf_queue_entry... + * + * However if this message is shown, then IMQ is somehow broken + * and you should report this to linuximq.net. + */ + + /* imq_dev_xmit is black hole that eats all packets, report that + * we eat this packet happily and increase dropped counters. + */ + + dev->stats.tx_dropped++; + dev_kfree_skb(skb); + + return NETDEV_TX_OK; + } + + skb_restore_cb(skb); /* restore skb->cb */ + + skb->imq_flags = 0; + skb->destructor = NULL; + + imq_done_check_queue_mapping(skb, dev); + + nf_reinject(entry, NF_ACCEPT); + + return NETDEV_TX_OK; +} + +static struct net_device *get_imq_device_by_index(int index) +{ + struct net_device *dev = NULL; + struct net *net; + char buf[8]; + + /* get device by name and cache result */ + snprintf(buf, sizeof(buf), "imq%d", index); + + /* Search device from all namespaces. */ + for_each_net(net) { + dev = dev_get_by_name(net, buf); + if (dev) + break; + } + + if (WARN_ON_ONCE(dev == NULL)) { + /* IMQ device not found. Exotic config? */ + return ERR_PTR(-ENODEV); + } + + imq_devs_cache[index] = dev; + dev_put(dev); + + return dev; +} + +static struct nf_queue_entry *nf_queue_entry_dup(struct nf_queue_entry *e) +{ + struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); + if (entry) { + if (nf_queue_entry_get_refs(entry)) + return entry; + kfree(entry); + } + return NULL; +} + +#ifdef CONFIG_BRIDGE_NETFILTER +/* When called from bridge netfilter, skb->data must point to MAC header + * before calling skb_gso_segment(). Else, original MAC header is lost + * and segmented skbs will be sent to wrong destination. + */ +static void nf_bridge_adjust_skb_data(struct sk_buff *skb) +{ + if (skb->nf_bridge) + __skb_push(skb, skb->network_header - skb->mac_header); +} + +static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) +{ + if (skb->nf_bridge) + __skb_pull(skb, skb->network_header - skb->mac_header); +} +#else +#define nf_bridge_adjust_skb_data(s) do {} while (0) +#define nf_bridge_adjust_segmented_data(s) do {} while (0) +#endif + +static void free_entry(struct nf_queue_entry *entry) +{ + nf_queue_entry_release_refs(entry); + kfree(entry); +} + +static int __imq_nf_queue(struct nf_queue_entry *entry, struct net_device *dev); + +static int __imq_nf_queue_gso(struct nf_queue_entry *entry, + struct net_device *dev, struct sk_buff *skb) +{ + int ret = -ENOMEM; + struct nf_queue_entry *entry_seg; + + nf_bridge_adjust_segmented_data(skb); + + if (skb->next == NULL) { /* last packet, no need to copy entry */ + struct sk_buff *gso_skb = entry->skb; + entry->skb = skb; + ret = __imq_nf_queue(entry, dev); + if (ret) + entry->skb = gso_skb; + return ret; + } + + skb->next = NULL; + + entry_seg = nf_queue_entry_dup(entry); + if (entry_seg) { + entry_seg->skb = skb; + ret = __imq_nf_queue(entry_seg, dev); + if (ret) + free_entry(entry_seg); + } + return ret; +} + +static int imq_nf_queue(struct nf_queue_entry *entry, unsigned queue_num) +{ + struct sk_buff *skb, *segs; + struct net_device *dev; + unsigned int queued; + int index, retval, err; + + index = entry->skb->imq_flags & IMQ_F_IFMASK; + if (unlikely(index > numdevs - 1)) { + if (net_ratelimit()) + pr_warn("IMQ: invalid device specified, highest is %u\n", + numdevs - 1); + retval = -EINVAL; + goto out_no_dev; + } + + /* check for imq device by index from cache */ + dev = imq_devs_cache[index]; + if (unlikely(!dev)) { + dev = get_imq_device_by_index(index); + if (IS_ERR(dev)) { + retval = PTR_ERR(dev); + goto out_no_dev; + } + } + + if (unlikely(!(dev->flags & IFF_UP))) { + entry->skb->imq_flags = 0; + retval = -ECANCELED; + goto out_no_dev; + } + + if (!skb_is_gso(entry->skb)) + return __imq_nf_queue(entry, dev); + + /* Since 3.10.x, GSO handling moved here as result of upstream commit + * a5fedd43d5f6c94c71053a66e4c3d2e35f1731a2 (netfilter: move + * skb_gso_segment into nfnetlink_queue module). + * + * Following code replicates the gso handling from + * 'net/netfilter/nfnetlink_queue_core.c':nfqnl_enqueue_packet(). + */ + + skb = entry->skb; + + switch (entry->pf) { + case NFPROTO_IPV4: + skb->protocol = htons(ETH_P_IP); + break; + case NFPROTO_IPV6: + skb->protocol = htons(ETH_P_IPV6); + break; + } + + nf_bridge_adjust_skb_data(skb); + segs = skb_gso_segment(skb, 0); + /* Does not use PTR_ERR to limit the number of error codes that can be + * returned by nf_queue. For instance, callers rely on -ECANCELED to + * mean 'ignore this hook'. + */ + err = -ENOBUFS; + if (IS_ERR(segs)) + goto out_err; + queued = 0; + err = 0; + do { + struct sk_buff *nskb = segs->next; + if (nskb && nskb->next) + nskb->cb_next = NULL; + if (err == 0) + err = __imq_nf_queue_gso(entry, dev, segs); + if (err == 0) + queued++; + else + kfree_skb(segs); + segs = nskb; + } while (segs); + + if (queued) { + if (err) /* some segments are already queued */ + free_entry(entry); + kfree_skb(skb); + return 0; + } + +out_err: + nf_bridge_adjust_segmented_data(skb); + retval = err; +out_no_dev: + return retval; +} + +static int __imq_nf_queue(struct nf_queue_entry *entry, struct net_device *dev) +{ + struct sk_buff *skb_orig, *skb, *skb_shared; + struct Qdisc *q; + struct netdev_queue *txq; + spinlock_t *root_lock; + int users; + int retval = -EINVAL; + unsigned int orig_queue_index; + + dev->last_rx = jiffies; + + skb = entry->skb; + skb_orig = NULL; + + /* skb has owner? => make clone */ + if (unlikely(skb->destructor)) { + skb_orig = skb; + skb = skb_clone(skb, GFP_ATOMIC); + if (unlikely(!skb)) { + retval = -ENOMEM; + goto out; + } + skb->cb_next = NULL; + entry->skb = skb; + } + + skb->nf_queue_entry = entry; + + dev->stats.rx_bytes += skb->len; + dev->stats.rx_packets++; + + if (!skb->dev) { + /* skb->dev == NULL causes problems, try the find cause. */ + if (net_ratelimit()) { + dev_warn(&dev->dev, + "received packet with skb->dev == NULL\n"); + dump_stack(); + } + + skb->dev = dev; + } + + /* Disables softirqs for lock below */ + rcu_read_lock_bh(); + + /* Multi-queue selection */ + orig_queue_index = skb_get_queue_mapping(skb); + txq = imq_select_queue(dev, skb); + + q = rcu_dereference(txq->qdisc); + if (unlikely(!q->enqueue)) + goto packet_not_eaten_by_imq_dev; + + root_lock = qdisc_lock(q); + spin_lock(root_lock); + + users = atomic_read(&skb->users); + + skb_shared = skb_get(skb); /* increase reference count by one */ + + /* backup skb->cb, as qdisc layer will overwrite it */ + skb_save_cb(skb_shared); + qdisc_enqueue_root(skb_shared, q); /* might kfree_skb */ + + if (likely(atomic_read(&skb_shared->users) == users + 1)) { + kfree_skb(skb_shared); /* decrease reference count by one */ + + skb->destructor = &imq_skb_destructor; + + /* cloned? */ + if (unlikely(skb_orig)) + kfree_skb(skb_orig); /* free original */ + + spin_unlock(root_lock); + rcu_read_unlock_bh(); + + /* schedule qdisc dequeue */ + __netif_schedule(q); + + retval = 0; + goto out; + } else { + skb_restore_cb(skb_shared); /* restore skb->cb */ + skb->nf_queue_entry = NULL; + /* + * qdisc dropped packet and decreased skb reference count of + * skb, so we don't really want to and try refree as that would + * actually destroy the skb. + */ + spin_unlock(root_lock); + goto packet_not_eaten_by_imq_dev; + } + +packet_not_eaten_by_imq_dev: + skb_set_queue_mapping(skb, orig_queue_index); + rcu_read_unlock_bh(); + + /* cloned? restore original */ + if (unlikely(skb_orig)) { + kfree_skb(skb); + entry->skb = skb_orig; + } + retval = -1; +out: + return retval; +} + +static unsigned int imq_nf_hook(const struct nf_hook_ops *ops, + struct sk_buff *pskb, + const struct net_device *indev, + const struct net_device *outdev, + int (*okfn)(struct sk_buff *)) +{ + return (pskb->imq_flags & IMQ_F_ENQUEUE) ? NF_IMQ_QUEUE : NF_ACCEPT; +} + +static int imq_close(struct net_device *dev) +{ + netif_stop_queue(dev); + return 0; +} + +static int imq_open(struct net_device *dev) +{ + netif_start_queue(dev); + return 0; +} + +static const struct net_device_ops imq_netdev_ops = { + .ndo_open = imq_open, + .ndo_stop = imq_close, + .ndo_start_xmit = imq_dev_xmit, + .ndo_get_stats = imq_get_stats, +}; + +static void imq_setup(struct net_device *dev) +{ + dev->netdev_ops = &imq_netdev_ops; + dev->type = ARPHRD_VOID; + dev->mtu = 16000; /* too small? */ + dev->tx_queue_len = 11000; /* too big? */ + dev->flags = IFF_NOARP; + dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | + NETIF_F_GSO | NETIF_F_HW_CSUM | + NETIF_F_HIGHDMA; + dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | + IFF_TX_SKB_SHARING); +} + +static int imq_validate(struct nlattr *tb[], struct nlattr *data[]) +{ + int ret = 0; + + if (tb[IFLA_ADDRESS]) { + if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { + ret = -EINVAL; + goto end; + } + if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { + ret = -EADDRNOTAVAIL; + goto end; + } + } + return 0; +end: + pr_warn("IMQ: imq_validate failed (%d)\n", ret); + return ret; +} + +static struct rtnl_link_ops imq_link_ops __read_mostly = { + .kind = "imq", + .priv_size = 0, + .setup = imq_setup, + .validate = imq_validate, +}; + +static const struct nf_queue_handler imq_nfqh = { + .outfn = imq_nf_queue, +}; + +static int __init imq_init_hooks(void) +{ + int ret; + + nf_register_queue_imq_handler(&imq_nfqh); + + ret = nf_register_hooks(imq_ops, ARRAY_SIZE(imq_ops)); + if (ret < 0) + nf_unregister_queue_imq_handler(); + + return ret; +} + +static int __init imq_init_one(int index) +{ + struct net_device *dev; + int ret; + + dev = alloc_netdev_mq(0, "imq%d", imq_setup, numqueues); + if (!dev) + return -ENOMEM; + + ret = dev_alloc_name(dev, dev->name); + if (ret < 0) + goto fail; + + dev->rtnl_link_ops = &imq_link_ops; + ret = register_netdevice(dev); + if (ret < 0) + goto fail; + + return 0; +fail: + free_netdev(dev); + return ret; +} + +static int __init imq_init_devs(void) +{ + int err, i; + + if (numdevs < 1 || numdevs > IMQ_MAX_DEVS) { + pr_err("IMQ: numdevs has to be betweed 1 and %u\n", + IMQ_MAX_DEVS); + return -EINVAL; + } + + if (numqueues < 1 || numqueues > IMQ_MAX_QUEUES) { + pr_err("IMQ: numqueues has to be betweed 1 and %u\n", + IMQ_MAX_QUEUES); + return -EINVAL; + } + + get_random_bytes(&imq_hashrnd, sizeof(imq_hashrnd)); + + rtnl_lock(); + err = __rtnl_link_register(&imq_link_ops); + + for (i = 0; i < numdevs && !err; i++) + err = imq_init_one(i); + + if (err) { + __rtnl_link_unregister(&imq_link_ops); + memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); + } + rtnl_unlock(); + + return err; +} + +static int __init imq_init_module(void) +{ + int err; + +#if defined(CONFIG_IMQ_NUM_DEVS) + BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS > 16); + BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS < 2); + BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS - 1 > IMQ_F_IFMASK); +#endif + + err = imq_init_devs(); + if (err) { + pr_err("IMQ: Error trying imq_init_devs(net)\n"); + return err; + } + + err = imq_init_hooks(); + if (err) { + pr_err(KERN_ERR "IMQ: Error trying imq_init_hooks()\n"); + rtnl_link_unregister(&imq_link_ops); + memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); + return err; + } + + pr_info("IMQ driver loaded successfully. (numdevs = %d, numqueues = %d)\n", + numdevs, numqueues); + +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) + pr_info("\tHooking IMQ before NAT on PREROUTING.\n"); +#else + pr_info("\tHooking IMQ after NAT on PREROUTING.\n"); +#endif +#if defined(CONFIG_IMQ_BEHAVIOR_AB) || defined(CONFIG_IMQ_BEHAVIOR_BB) + pr_info("\tHooking IMQ before NAT on POSTROUTING.\n"); +#else + pr_info("\tHooking IMQ after NAT on POSTROUTING.\n"); +#endif + + return 0; +} + +static void __exit imq_unhook(void) +{ + nf_unregister_hooks(imq_ops, ARRAY_SIZE(imq_ops)); + nf_unregister_queue_imq_handler(); +} + +static void __exit imq_cleanup_devs(void) +{ + rtnl_link_unregister(&imq_link_ops); + memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); +} + +static void __exit imq_exit_module(void) +{ + imq_unhook(); + imq_cleanup_devs(); + pr_info("IMQ driver unloaded successfully.\n"); +} + +module_init(imq_init_module); +module_exit(imq_exit_module); + +module_param(numdevs, int, 0); +module_param(numqueues, int, 0); +MODULE_PARM_DESC(numdevs, "number of IMQ devices (how many imq* devices will be created)"); +MODULE_PARM_DESC(numqueues, "number of queues per IMQ device"); +MODULE_AUTHOR("http://www.linuximq.net"); +MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See http://www.linuximq.net/ for more information."); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_RTNL_LINK("imq"); + diff --git a/include/linux/imq.h b/include/linux/imq.h new file mode 100644 index 0000000..1babb09 --- /dev/null +++ b/include/linux/imq.h @@ -0,0 +1,13 @@ +#ifndef _IMQ_H +#define _IMQ_H + +/* IFMASK (16 device indexes, 0 to 15) and flag(s) fit in 5 bits */ +#define IMQ_F_BITS 5 + +#define IMQ_F_IFMASK 0x0f +#define IMQ_F_ENQUEUE 0x10 + +#define IMQ_MAX_DEVS (IMQ_F_IFMASK + 1) + +#endif /* _IMQ_H */ + diff --git a/include/linux/netfilter/xt_IMQ.h b/include/linux/netfilter/xt_IMQ.h new file mode 100644 index 0000000..9b07230 --- /dev/null +++ b/include/linux/netfilter/xt_IMQ.h @@ -0,0 +1,9 @@ +#ifndef _XT_IMQ_H +#define _XT_IMQ_H + +struct xt_imq_info { + unsigned int todev; /* target imq device */ +}; + +#endif /* _XT_IMQ_H */ + diff --git a/include/linux/netfilter_ipv4/ipt_IMQ.h b/include/linux/netfilter_ipv4/ipt_IMQ.h new file mode 100644 index 0000000..7af320f --- /dev/null +++ b/include/linux/netfilter_ipv4/ipt_IMQ.h @@ -0,0 +1,10 @@ +#ifndef _IPT_IMQ_H +#define _IPT_IMQ_H + +/* Backwards compatibility for old userspace */ +#include + +#define ipt_imq_info xt_imq_info + +#endif /* _IPT_IMQ_H */ + diff --git a/include/linux/netfilter_ipv6/ip6t_IMQ.h b/include/linux/netfilter_ipv6/ip6t_IMQ.h new file mode 100644 index 0000000..198ac01 --- /dev/null +++ b/include/linux/netfilter_ipv6/ip6t_IMQ.h @@ -0,0 +1,10 @@ +#ifndef _IP6T_IMQ_H +#define _IP6T_IMQ_H + +/* Backwards compatibility for old userspace */ +#include + +#define ip6t_imq_info xt_imq_info + +#endif /* _IP6T_IMQ_H */ + diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index f66f346..d699b19 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -33,6 +33,9 @@ #include #include #include +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) +#include +#endif /* Don't change this without changing skb_csum_unnecessary! */ #define CHECKSUM_NONE 0 @@ -418,6 +421,9 @@ struct sk_buff { * first. This is owned by whoever has the skb queued ATM. */ char cb[48] __aligned(8); +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) + void *cb_next; +#endif unsigned long _skb_refdst; #ifdef CONFIG_XFRM @@ -453,6 +459,9 @@ struct sk_buff { #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) struct nf_conntrack *nfct; #endif +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) + struct nf_queue_entry *nf_queue_entry; +#endif #ifdef CONFIG_BRIDGE_NETFILTER struct nf_bridge_info *nf_bridge; #endif @@ -490,6 +499,9 @@ struct sk_buff { */ __u8 encapsulation:1; /* 6/8 bit hole (depending on ndisc_nodetype presence) */ +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) + __u8 imq_flags:IMQ_F_BITS; +#endif kmemcheck_bitfield_end(flags2); #if defined CONFIG_NET_DMA || defined CONFIG_NET_RX_BUSY_POLL @@ -625,6 +637,12 @@ static inline struct rtable *skb_rtable(const struct sk_buff *skb) return (struct rtable *)skb_dst(skb); } + +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) +extern int skb_save_cb(struct sk_buff *skb); +extern int skb_restore_cb(struct sk_buff *skb); +#endif + void kfree_skb(struct sk_buff *skb); void kfree_skb_list(struct sk_buff *segs); void skb_tx_error(struct sk_buff *skb); @@ -2635,6 +2653,10 @@ static inline void __nf_copy(struct sk_buff *dst, const struct sk_buff *src) nf_conntrack_get(src->nfct); dst->nfctinfo = src->nfctinfo; #endif +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) + dst->imq_flags = src->imq_flags; + dst->nf_queue_entry = src->nf_queue_entry; +#endif #ifdef CONFIG_BRIDGE_NETFILTER dst->nf_bridge = src->nf_bridge; nf_bridge_get(src->nf_bridge); diff --git a/include/net/netfilter/nf_queue.h b/include/net/netfilter/nf_queue.h index aaba4bb..f6e92a4 100644 --- a/include/net/netfilter/nf_queue.h +++ b/include/net/netfilter/nf_queue.h @@ -29,6 +29,12 @@ struct nf_queue_handler { void nf_register_queue_handler(const struct nf_queue_handler *qh); void nf_unregister_queue_handler(void); void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict); +extern void nf_queue_entry_release_refs(struct nf_queue_entry *entry); + +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) +extern void nf_register_queue_imq_handler(const struct nf_queue_handler *qh); +extern void nf_unregister_queue_imq_handler(void); +#endif bool nf_queue_entry_get_refs(struct nf_queue_entry *entry); void nf_queue_entry_release_refs(struct nf_queue_entry *entry); diff --git a/include/uapi/linux/netfilter.h b/include/uapi/linux/netfilter.h index f7dc0eb..58c46a9 100644 --- a/include/uapi/linux/netfilter.h +++ b/include/uapi/linux/netfilter.h @@ -13,7 +13,8 @@ #define NF_QUEUE 3 #define NF_REPEAT 4 #define NF_STOP 5 -#define NF_MAX_VERDICT NF_STOP +#define NF_IMQ_QUEUE 6 +#define NF_MAX_VERDICT NF_IMQ_QUEUE /* we overload the higher bits for encoding auxiliary data such as the queue * number or errno values. Not nice, but better than additional function diff --git a/net/core/dev.c b/net/core/dev.c index 3d13874..9842f21 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -131,6 +131,9 @@ #include #include #include +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) +#include +#endif #include "net-sysfs.h" @@ -2595,7 +2598,12 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, } } +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) + if (!list_empty(&ptype_all) && + !(skb->imq_flags & IMQ_F_ENQUEUE)) +#else if (!list_empty(&ptype_all)) +#endif dev_queue_xmit_nit(skb, dev); skb_len = skb->len; diff --git a/net/core/skbuff.c b/net/core/skbuff.c index c28c7fe..a5f1888 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -73,6 +73,84 @@ struct kmem_cache *skbuff_head_cache __read_mostly; static struct kmem_cache *skbuff_fclone_cache __read_mostly; +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) +static struct kmem_cache *skbuff_cb_store_cache __read_mostly; + +/* Control buffer save/restore for IMQ devices */ +struct skb_cb_table { + char cb[48] __aligned(8); + void *cb_next; + atomic_t refcnt; +}; + +static DEFINE_SPINLOCK(skb_cb_store_lock); + +int skb_save_cb(struct sk_buff *skb) +{ + struct skb_cb_table *next; + + next = kmem_cache_alloc(skbuff_cb_store_cache, GFP_ATOMIC); + if (!next) + return -ENOMEM; + + BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb)); + + memcpy(next->cb, skb->cb, sizeof(skb->cb)); + next->cb_next = skb->cb_next; + + atomic_set(&next->refcnt, 1); + + skb->cb_next = next; + return 0; +} +EXPORT_SYMBOL(skb_save_cb); + +int skb_restore_cb(struct sk_buff *skb) +{ + struct skb_cb_table *next; + + if (!skb->cb_next) + return 0; + + next = skb->cb_next; + + BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb)); + + memcpy(skb->cb, next->cb, sizeof(skb->cb)); + skb->cb_next = next->cb_next; + + spin_lock(&skb_cb_store_lock); + + if (atomic_dec_and_test(&next->refcnt)) + kmem_cache_free(skbuff_cb_store_cache, next); + + spin_unlock(&skb_cb_store_lock); + + return 0; +} +EXPORT_SYMBOL(skb_restore_cb); + +static void skb_copy_stored_cb(struct sk_buff *new, const struct sk_buff *__old) +{ + struct skb_cb_table *next; + struct sk_buff *old; + + if (!__old->cb_next) { + new->cb_next = NULL; + return; + } + + spin_lock(&skb_cb_store_lock); + + old = (struct sk_buff *)__old; + + next = old->cb_next; + atomic_inc(&next->refcnt); + new->cb_next = next; + + spin_unlock(&skb_cb_store_lock); +} +#endif /** * skb_panic - private function for out-of-line support @@ -577,6 +656,28 @@ static void skb_release_head_state(struct sk_buff *skb) WARN_ON(in_irq()); skb->destructor(skb); } +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) + /* + * This should not happen. When it does, avoid memleak by restoring + * the chain of cb-backups. + */ + while (skb->cb_next != NULL) { + if (net_ratelimit()) + pr_warn("IMQ: kfree_skb: skb->cb_next: %08x\n", + (unsigned int)skb->cb_next); + + skb_restore_cb(skb); + } + /* + * This should not happen either, nf_queue_entry is nullified in + * imq_dev_xmit(). If we have non-NULL nf_queue_entry then we are + * leaking entry pointers, maybe memory. We don't know if this is + * pointer to already freed memory, or should this be freed. + * If this happens we need to add refcounting, etc for nf_queue_entry. + */ + if (skb->nf_queue_entry && net_ratelimit()) + pr_warn("%s\n", "IMQ: kfree_skb: skb->nf_queue_entry != NULL"); +#endif #if IS_ENABLED(CONFIG_NF_CONNTRACK) nf_conntrack_put(skb->nfct); #endif @@ -709,6 +810,10 @@ static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old) new->sp = secpath_get(old->sp); #endif memcpy(new->cb, old->cb, sizeof(old->cb)); +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) + new->cb_next = NULL; + /*skb_copy_stored_cb(new, old);*/ +#endif new->csum = old->csum; new->local_df = old->local_df; new->pkt_type = old->pkt_type; @@ -3112,6 +3217,13 @@ void __init skb_init(void) 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) + skbuff_cb_store_cache = kmem_cache_create("skbuff_cb_store_cache", + sizeof(struct skb_cb_table), + 0, + SLAB_HWCACHE_ALIGN|SLAB_PANIC, + NULL); +#endif } /** diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index b6fa35e..08dcfef 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -64,9 +64,6 @@ static int ip6_finish_output2(struct sk_buff *skb) struct in6_addr *nexthop; int ret; - skb->protocol = htons(ETH_P_IPV6); - skb->dev = dev; - if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); @@ -143,6 +140,13 @@ int ip6_output(struct sk_buff *skb) return 0; } + /* + * IMQ-patch: moved setting skb->dev and skb->protocol from + * ip6_finish_output2 to fix crashing at netif_skb_features(). + */ + skb->protocol = htons(ETH_P_IPV6); + skb->dev = dev; + return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, dev, ip6_finish_output, !(IP6CB(skb)->flags & IP6SKB_REROUTED)); diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index 6e839b6..45ac31c 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -630,6 +630,18 @@ config NETFILTER_XT_TARGET_LOG To compile it as a module, choose M here. If unsure, say N. +config NETFILTER_XT_TARGET_IMQ + tristate '"IMQ" target support' + depends on NETFILTER_XTABLES + depends on IP_NF_MANGLE || IP6_NF_MANGLE + select IMQ + default m if NETFILTER_ADVANCED=n + help + This option adds a `IMQ' target which is used to specify if and + to which imq device packets should get enqueued/dequeued. + + To compile it as a module, choose M here. If unsure, say N. + config NETFILTER_XT_TARGET_MARK tristate '"MARK" target support' depends on NETFILTER_ADVANCED diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index c3a0a12..9647f06 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -82,6 +82,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_CT) += xt_CT.o obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o obj-$(CONFIG_NETFILTER_XT_TARGET_HMARK) += xt_HMARK.o +obj-$(CONFIG_NETFILTER_XT_TARGET_IMQ) += xt_IMQ.o obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o obj-$(CONFIG_NETFILTER_XT_TARGET_LOG) += xt_LOG.o obj-$(CONFIG_NETFILTER_XT_TARGET_NETMAP) += xt_NETMAP.o diff --git a/net/netfilter/core.c b/net/netfilter/core.c index 593b16e..740cd69 100644 --- a/net/netfilter/core.c +++ b/net/netfilter/core.c @@ -191,9 +191,11 @@ next_hook: ret = NF_DROP_GETERR(verdict); if (ret == 0) ret = -EPERM; - } else if ((verdict & NF_VERDICT_MASK) == NF_QUEUE) { + } else if ((verdict & NF_VERDICT_MASK) == NF_QUEUE || + (verdict & NF_VERDICT_MASK) == NF_IMQ_QUEUE) { int err = nf_queue(skb, elem, pf, hook, indev, outdev, okfn, - verdict >> NF_VERDICT_QBITS); + verdict >> NF_VERDICT_QBITS, + verdict & NF_VERDICT_MASK); if (err < 0) { if (err == -ECANCELED) goto next_hook; diff --git a/net/netfilter/nf_internals.h b/net/netfilter/nf_internals.h index 3deec99..c1a1397 100644 --- a/net/netfilter/nf_internals.h +++ b/net/netfilter/nf_internals.h @@ -29,7 +29,7 @@ extern int nf_queue(struct sk_buff *skb, int nf_queue(struct sk_buff *skb, struct nf_hook_ops *elem, u_int8_t pf, unsigned int hook, struct net_device *indev, struct net_device *outdev, int (*okfn)(struct sk_buff *), - unsigned int queuenum); + unsigned int queuenum, unsigned int queuetype); int __init netfilter_queue_init(void); /* nf_log.c */ diff --git a/net/netfilter/nf_queue.c b/net/netfilter/nf_queue.c index 5d24b1f..28317dc 100644 --- a/net/netfilter/nf_queue.c +++ b/net/netfilter/nf_queue.c @@ -27,6 +27,23 @@ */ static const struct nf_queue_handler __rcu *queue_handler __read_mostly; +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) +static const struct nf_queue_handler __rcu *queue_imq_handler __read_mostly; + +void nf_register_queue_imq_handler(const struct nf_queue_handler *qh) +{ + rcu_assign_pointer(queue_imq_handler, qh); +} +EXPORT_SYMBOL_GPL(nf_register_queue_imq_handler); + +void nf_unregister_queue_imq_handler(void) +{ + RCU_INIT_POINTER(queue_imq_handler, NULL); + synchronize_rcu(); +} +EXPORT_SYMBOL_GPL(nf_unregister_queue_imq_handler); +#endif + /* return EBUSY when somebody else is registered, return EEXIST if the * same handler is registered, return 0 in case of success. */ void nf_register_queue_handler(const struct nf_queue_handler *qh) @@ -105,7 +122,8 @@ int nf_queue(struct sk_buff *skb, struct net_device *indev, struct net_device *outdev, int (*okfn)(struct sk_buff *), - unsigned int queuenum) + unsigned int queuenum, + unsigned int queuetype) { int status = -ENOENT; struct nf_queue_entry *entry = NULL; @@ -115,7 +133,17 @@ int nf_queue(struct sk_buff *skb, /* QUEUE == DROP if no one is waiting, to be safe. */ rcu_read_lock(); - qh = rcu_dereference(queue_handler); + if (queuetype == NF_IMQ_QUEUE) { +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) + qh = rcu_dereference(queue_imq_handler); +#else + BUG(); + goto err_unlock; +#endif + } else { + qh = rcu_dereference(queue_handler); + } + if (!qh) { status = -ESRCH; goto err_unlock; @@ -205,9 +233,11 @@ void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict) local_bh_enable(); break; case NF_QUEUE: + case NF_IMQ_QUEUE: err = nf_queue(skb, elem, entry->pf, entry->hook, entry->indev, entry->outdev, entry->okfn, - verdict >> NF_VERDICT_QBITS); + verdict >> NF_VERDICT_QBITS, + verdict & NF_VERDICT_MASK); if (err < 0) { if (err == -ECANCELED) goto next_hook; diff --git a/net/netfilter/xt_IMQ.c b/net/netfilter/xt_IMQ.c new file mode 100644 index 0000000..1c3cd66 --- /dev/null +++ b/net/netfilter/xt_IMQ.c @@ -0,0 +1,72 @@ +/* + * This target marks packets to be enqueued to an imq device + */ +#include +#include +#include +#include +#include + +static unsigned int imq_target(struct sk_buff *pskb, + const struct xt_action_param *par) +{ + const struct xt_imq_info *mr = par->targinfo; + + pskb->imq_flags = (mr->todev & IMQ_F_IFMASK) | IMQ_F_ENQUEUE; + + return XT_CONTINUE; +} + +static int imq_checkentry(const struct xt_tgchk_param *par) +{ + struct xt_imq_info *mr = par->targinfo; + + if (mr->todev > IMQ_MAX_DEVS - 1) { + pr_warn("IMQ: invalid device specified, highest is %u\n", + IMQ_MAX_DEVS - 1); + return -EINVAL; + } + + return 0; +} + +static struct xt_target xt_imq_reg[] __read_mostly = { + { + .name = "IMQ", + .family = AF_INET, + .checkentry = imq_checkentry, + .target = imq_target, + .targetsize = sizeof(struct xt_imq_info), + .table = "mangle", + .me = THIS_MODULE + }, + { + .name = "IMQ", + .family = AF_INET6, + .checkentry = imq_checkentry, + .target = imq_target, + .targetsize = sizeof(struct xt_imq_info), + .table = "mangle", + .me = THIS_MODULE + }, +}; + +static int __init imq_init(void) +{ + return xt_register_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg)); +} + +static void __exit imq_fini(void) +{ + xt_unregister_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg)); +} + +module_init(imq_init); +module_exit(imq_fini); + +MODULE_AUTHOR("http://www.linuximq.net"); +MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See http://www.linuximq.net/ for more information."); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("ipt_IMQ"); +MODULE_ALIAS("ip6t_IMQ"); +