| /* |
| * IPVS An implementation of the IP virtual server support for the |
| * LINUX operating system. IPVS is now implemented as a module |
| * over the Netfilter framework. IPVS can be used to build a |
| * high-performance and highly available server based on a |
| * cluster of servers. |
| * |
| * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
| * Peter Kese <peter.kese@ijs.si> |
| * Julian Anastasov <ja@ssi.bg> |
| * |
| * 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. |
| * |
| * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese, |
| * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms |
| * and others. |
| * |
| * Changes: |
| * Paul `Rusty' Russell properly handle non-linear skbs |
| * Harald Welte don't use nfcache |
| * |
| */ |
| |
| #define KMSG_COMPONENT "IPVS" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/ip.h> |
| #include <linux/tcp.h> |
| #include <linux/sctp.h> |
| #include <linux/icmp.h> |
| #include <linux/slab.h> |
| |
| #include <net/ip.h> |
| #include <net/tcp.h> |
| #include <net/udp.h> |
| #include <net/icmp.h> /* for icmp_send */ |
| #include <net/route.h> |
| #include <net/ip6_checksum.h> |
| #include <net/netns/generic.h> /* net_generic() */ |
| |
| #include <linux/netfilter.h> |
| #include <linux/netfilter_ipv4.h> |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| #include <net/ipv6.h> |
| #include <linux/netfilter_ipv6.h> |
| #include <net/ip6_route.h> |
| #endif |
| |
| #include <net/ip_vs.h> |
| |
| |
| EXPORT_SYMBOL(register_ip_vs_scheduler); |
| EXPORT_SYMBOL(unregister_ip_vs_scheduler); |
| EXPORT_SYMBOL(ip_vs_proto_name); |
| EXPORT_SYMBOL(ip_vs_conn_new); |
| EXPORT_SYMBOL(ip_vs_conn_in_get); |
| EXPORT_SYMBOL(ip_vs_conn_out_get); |
| #ifdef CONFIG_IP_VS_PROTO_TCP |
| EXPORT_SYMBOL(ip_vs_tcp_conn_listen); |
| #endif |
| EXPORT_SYMBOL(ip_vs_conn_put); |
| #ifdef CONFIG_IP_VS_DEBUG |
| EXPORT_SYMBOL(ip_vs_get_debug_level); |
| #endif |
| |
| static int ip_vs_net_id __read_mostly; |
| /* netns cnt used for uniqueness */ |
| static atomic_t ipvs_netns_cnt = ATOMIC_INIT(0); |
| |
| /* ID used in ICMP lookups */ |
| #define icmp_id(icmph) (((icmph)->un).echo.id) |
| #define icmpv6_id(icmph) (icmph->icmp6_dataun.u_echo.identifier) |
| |
| const char *ip_vs_proto_name(unsigned int proto) |
| { |
| static char buf[20]; |
| |
| switch (proto) { |
| case IPPROTO_IP: |
| return "IP"; |
| case IPPROTO_UDP: |
| return "UDP"; |
| case IPPROTO_TCP: |
| return "TCP"; |
| case IPPROTO_SCTP: |
| return "SCTP"; |
| case IPPROTO_ICMP: |
| return "ICMP"; |
| #ifdef CONFIG_IP_VS_IPV6 |
| case IPPROTO_ICMPV6: |
| return "ICMPv6"; |
| #endif |
| default: |
| sprintf(buf, "IP_%d", proto); |
| return buf; |
| } |
| } |
| |
| void ip_vs_init_hash_table(struct list_head *table, int rows) |
| { |
| while (--rows >= 0) |
| INIT_LIST_HEAD(&table[rows]); |
| } |
| |
| static inline void |
| ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb) |
| { |
| struct ip_vs_dest *dest = cp->dest; |
| struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
| |
| if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { |
| struct ip_vs_cpu_stats *s; |
| |
| s = this_cpu_ptr(dest->stats.cpustats); |
| s->ustats.inpkts++; |
| u64_stats_update_begin(&s->syncp); |
| s->ustats.inbytes += skb->len; |
| u64_stats_update_end(&s->syncp); |
| |
| s = this_cpu_ptr(dest->svc->stats.cpustats); |
| s->ustats.inpkts++; |
| u64_stats_update_begin(&s->syncp); |
| s->ustats.inbytes += skb->len; |
| u64_stats_update_end(&s->syncp); |
| |
| s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
| s->ustats.inpkts++; |
| u64_stats_update_begin(&s->syncp); |
| s->ustats.inbytes += skb->len; |
| u64_stats_update_end(&s->syncp); |
| } |
| } |
| |
| |
| static inline void |
| ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb) |
| { |
| struct ip_vs_dest *dest = cp->dest; |
| struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
| |
| if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { |
| struct ip_vs_cpu_stats *s; |
| |
| s = this_cpu_ptr(dest->stats.cpustats); |
| s->ustats.outpkts++; |
| u64_stats_update_begin(&s->syncp); |
| s->ustats.outbytes += skb->len; |
| u64_stats_update_end(&s->syncp); |
| |
| s = this_cpu_ptr(dest->svc->stats.cpustats); |
| s->ustats.outpkts++; |
| u64_stats_update_begin(&s->syncp); |
| s->ustats.outbytes += skb->len; |
| u64_stats_update_end(&s->syncp); |
| |
| s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
| s->ustats.outpkts++; |
| u64_stats_update_begin(&s->syncp); |
| s->ustats.outbytes += skb->len; |
| u64_stats_update_end(&s->syncp); |
| } |
| } |
| |
| |
| static inline void |
| ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc) |
| { |
| struct netns_ipvs *ipvs = net_ipvs(svc->net); |
| struct ip_vs_cpu_stats *s; |
| |
| s = this_cpu_ptr(cp->dest->stats.cpustats); |
| s->ustats.conns++; |
| |
| s = this_cpu_ptr(svc->stats.cpustats); |
| s->ustats.conns++; |
| |
| s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
| s->ustats.conns++; |
| } |
| |
| |
| static inline void |
| ip_vs_set_state(struct ip_vs_conn *cp, int direction, |
| const struct sk_buff *skb, |
| struct ip_vs_proto_data *pd) |
| { |
| if (likely(pd->pp->state_transition)) |
| pd->pp->state_transition(cp, direction, skb, pd); |
| } |
| |
| static inline int |
| ip_vs_conn_fill_param_persist(const struct ip_vs_service *svc, |
| struct sk_buff *skb, int protocol, |
| const union nf_inet_addr *caddr, __be16 cport, |
| const union nf_inet_addr *vaddr, __be16 vport, |
| struct ip_vs_conn_param *p) |
| { |
| ip_vs_conn_fill_param(svc->net, svc->af, protocol, caddr, cport, vaddr, |
| vport, p); |
| p->pe = rcu_dereference(svc->pe); |
| if (p->pe && p->pe->fill_param) |
| return p->pe->fill_param(p, skb); |
| |
| return 0; |
| } |
| |
| /* |
| * IPVS persistent scheduling function |
| * It creates a connection entry according to its template if exists, |
| * or selects a server and creates a connection entry plus a template. |
| * Locking: we are svc user (svc->refcnt), so we hold all dests too |
| * Protocols supported: TCP, UDP |
| */ |
| static struct ip_vs_conn * |
| ip_vs_sched_persist(struct ip_vs_service *svc, |
| struct sk_buff *skb, __be16 src_port, __be16 dst_port, |
| int *ignored, struct ip_vs_iphdr *iph) |
| { |
| struct ip_vs_conn *cp = NULL; |
| struct ip_vs_dest *dest; |
| struct ip_vs_conn *ct; |
| __be16 dport = 0; /* destination port to forward */ |
| unsigned int flags; |
| struct ip_vs_conn_param param; |
| const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) }; |
| union nf_inet_addr snet; /* source network of the client, |
| after masking */ |
| |
| /* Mask saddr with the netmask to adjust template granularity */ |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (svc->af == AF_INET6) |
| ipv6_addr_prefix(&snet.in6, &iph->saddr.in6, |
| (__force __u32) svc->netmask); |
| else |
| #endif |
| snet.ip = iph->saddr.ip & svc->netmask; |
| |
| IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u " |
| "mnet %s\n", |
| IP_VS_DBG_ADDR(svc->af, &iph->saddr), ntohs(src_port), |
| IP_VS_DBG_ADDR(svc->af, &iph->daddr), ntohs(dst_port), |
| IP_VS_DBG_ADDR(svc->af, &snet)); |
| |
| /* |
| * As far as we know, FTP is a very complicated network protocol, and |
| * it uses control connection and data connections. For active FTP, |
| * FTP server initialize data connection to the client, its source port |
| * is often 20. For passive FTP, FTP server tells the clients the port |
| * that it passively listens to, and the client issues the data |
| * connection. In the tunneling or direct routing mode, the load |
| * balancer is on the client-to-server half of connection, the port |
| * number is unknown to the load balancer. So, a conn template like |
| * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP |
| * service, and a template like <caddr, 0, vaddr, vport, daddr, dport> |
| * is created for other persistent services. |
| */ |
| { |
| int protocol = iph->protocol; |
| const union nf_inet_addr *vaddr = &iph->daddr; |
| __be16 vport = 0; |
| |
| if (dst_port == svc->port) { |
| /* non-FTP template: |
| * <protocol, caddr, 0, vaddr, vport, daddr, dport> |
| * FTP template: |
| * <protocol, caddr, 0, vaddr, 0, daddr, 0> |
| */ |
| if (svc->port != FTPPORT) |
| vport = dst_port; |
| } else { |
| /* Note: persistent fwmark-based services and |
| * persistent port zero service are handled here. |
| * fwmark template: |
| * <IPPROTO_IP,caddr,0,fwmark,0,daddr,0> |
| * port zero template: |
| * <protocol,caddr,0,vaddr,0,daddr,0> |
| */ |
| if (svc->fwmark) { |
| protocol = IPPROTO_IP; |
| vaddr = &fwmark; |
| } |
| } |
| /* return *ignored = -1 so NF_DROP can be used */ |
| if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0, |
| vaddr, vport, ¶m) < 0) { |
| *ignored = -1; |
| return NULL; |
| } |
| } |
| |
| /* Check if a template already exists */ |
| ct = ip_vs_ct_in_get(¶m); |
| if (!ct || !ip_vs_check_template(ct)) { |
| struct ip_vs_scheduler *sched; |
| |
| /* |
| * No template found or the dest of the connection |
| * template is not available. |
| * return *ignored=0 i.e. ICMP and NF_DROP |
| */ |
| sched = rcu_dereference(svc->scheduler); |
| dest = sched->schedule(svc, skb, iph); |
| if (!dest) { |
| IP_VS_DBG(1, "p-schedule: no dest found.\n"); |
| kfree(param.pe_data); |
| *ignored = 0; |
| return NULL; |
| } |
| |
| if (dst_port == svc->port && svc->port != FTPPORT) |
| dport = dest->port; |
| |
| /* Create a template |
| * This adds param.pe_data to the template, |
| * and thus param.pe_data will be destroyed |
| * when the template expires */ |
| ct = ip_vs_conn_new(¶m, &dest->addr, dport, |
| IP_VS_CONN_F_TEMPLATE, dest, skb->mark); |
| if (ct == NULL) { |
| kfree(param.pe_data); |
| *ignored = -1; |
| return NULL; |
| } |
| |
| ct->timeout = svc->timeout; |
| } else { |
| /* set destination with the found template */ |
| dest = ct->dest; |
| kfree(param.pe_data); |
| } |
| |
| dport = dst_port; |
| if (dport == svc->port && dest->port) |
| dport = dest->port; |
| |
| flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
| && iph->protocol == IPPROTO_UDP) ? |
| IP_VS_CONN_F_ONE_PACKET : 0; |
| |
| /* |
| * Create a new connection according to the template |
| */ |
| ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, &iph->saddr, |
| src_port, &iph->daddr, dst_port, ¶m); |
| |
| cp = ip_vs_conn_new(¶m, &dest->addr, dport, flags, dest, skb->mark); |
| if (cp == NULL) { |
| ip_vs_conn_put(ct); |
| *ignored = -1; |
| return NULL; |
| } |
| |
| /* |
| * Add its control |
| */ |
| ip_vs_control_add(cp, ct); |
| ip_vs_conn_put(ct); |
| |
| ip_vs_conn_stats(cp, svc); |
| return cp; |
| } |
| |
| |
| /* |
| * IPVS main scheduling function |
| * It selects a server according to the virtual service, and |
| * creates a connection entry. |
| * Protocols supported: TCP, UDP |
| * |
| * Usage of *ignored |
| * |
| * 1 : protocol tried to schedule (eg. on SYN), found svc but the |
| * svc/scheduler decides that this packet should be accepted with |
| * NF_ACCEPT because it must not be scheduled. |
| * |
| * 0 : scheduler can not find destination, so try bypass or |
| * return ICMP and then NF_DROP (ip_vs_leave). |
| * |
| * -1 : scheduler tried to schedule but fatal error occurred, eg. |
| * ip_vs_conn_new failure (ENOMEM) or ip_vs_sip_fill_param |
| * failure such as missing Call-ID, ENOMEM on skb_linearize |
| * or pe_data. In this case we should return NF_DROP without |
| * any attempts to send ICMP with ip_vs_leave. |
| */ |
| struct ip_vs_conn * |
| ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, |
| struct ip_vs_proto_data *pd, int *ignored, |
| struct ip_vs_iphdr *iph) |
| { |
| struct ip_vs_protocol *pp = pd->pp; |
| struct ip_vs_conn *cp = NULL; |
| struct ip_vs_scheduler *sched; |
| struct ip_vs_dest *dest; |
| __be16 _ports[2], *pptr; |
| unsigned int flags; |
| |
| *ignored = 1; |
| /* |
| * IPv6 frags, only the first hit here. |
| */ |
| pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
| if (pptr == NULL) |
| return NULL; |
| |
| /* |
| * FTPDATA needs this check when using local real server. |
| * Never schedule Active FTPDATA connections from real server. |
| * For LVS-NAT they must be already created. For other methods |
| * with persistence the connection is created on SYN+ACK. |
| */ |
| if (pptr[0] == FTPDATA) { |
| IP_VS_DBG_PKT(12, svc->af, pp, skb, 0, |
| "Not scheduling FTPDATA"); |
| return NULL; |
| } |
| |
| /* |
| * Do not schedule replies from local real server. |
| */ |
| if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK) && |
| (cp = pp->conn_in_get(svc->af, skb, iph, 1))) { |
| IP_VS_DBG_PKT(12, svc->af, pp, skb, 0, |
| "Not scheduling reply for existing connection"); |
| __ip_vs_conn_put(cp); |
| return NULL; |
| } |
| |
| /* |
| * Persistent service |
| */ |
| if (svc->flags & IP_VS_SVC_F_PERSISTENT) |
| return ip_vs_sched_persist(svc, skb, pptr[0], pptr[1], ignored, |
| iph); |
| |
| *ignored = 0; |
| |
| /* |
| * Non-persistent service |
| */ |
| if (!svc->fwmark && pptr[1] != svc->port) { |
| if (!svc->port) |
| pr_err("Schedule: port zero only supported " |
| "in persistent services, " |
| "check your ipvs configuration\n"); |
| return NULL; |
| } |
| |
| sched = rcu_dereference(svc->scheduler); |
| dest = sched->schedule(svc, skb, iph); |
| if (dest == NULL) { |
| IP_VS_DBG(1, "Schedule: no dest found.\n"); |
| return NULL; |
| } |
| |
| flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
| && iph->protocol == IPPROTO_UDP) ? |
| IP_VS_CONN_F_ONE_PACKET : 0; |
| |
| /* |
| * Create a connection entry. |
| */ |
| { |
| struct ip_vs_conn_param p; |
| |
| ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, |
| &iph->saddr, pptr[0], &iph->daddr, |
| pptr[1], &p); |
| cp = ip_vs_conn_new(&p, &dest->addr, |
| dest->port ? dest->port : pptr[1], |
| flags, dest, skb->mark); |
| if (!cp) { |
| *ignored = -1; |
| return NULL; |
| } |
| } |
| |
| IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u " |
| "d:%s:%u conn->flags:%X conn->refcnt:%d\n", |
| ip_vs_fwd_tag(cp), |
| IP_VS_DBG_ADDR(svc->af, &cp->caddr), ntohs(cp->cport), |
| IP_VS_DBG_ADDR(svc->af, &cp->vaddr), ntohs(cp->vport), |
| IP_VS_DBG_ADDR(svc->af, &cp->daddr), ntohs(cp->dport), |
| cp->flags, atomic_read(&cp->refcnt)); |
| |
| ip_vs_conn_stats(cp, svc); |
| return cp; |
| } |
| |
| |
| /* |
| * Pass or drop the packet. |
| * Called by ip_vs_in, when the virtual service is available but |
| * no destination is available for a new connection. |
| */ |
| int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, |
| struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph) |
| { |
| __be16 _ports[2], *pptr; |
| #ifdef CONFIG_SYSCTL |
| struct net *net; |
| struct netns_ipvs *ipvs; |
| int unicast; |
| #endif |
| |
| pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
| if (pptr == NULL) { |
| return NF_DROP; |
| } |
| |
| #ifdef CONFIG_SYSCTL |
| net = skb_net(skb); |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (svc->af == AF_INET6) |
| unicast = ipv6_addr_type(&iph->daddr.in6) & IPV6_ADDR_UNICAST; |
| else |
| #endif |
| unicast = (inet_addr_type(net, iph->daddr.ip) == RTN_UNICAST); |
| |
| /* if it is fwmark-based service, the cache_bypass sysctl is up |
| and the destination is a non-local unicast, then create |
| a cache_bypass connection entry */ |
| ipvs = net_ipvs(net); |
| if (ipvs->sysctl_cache_bypass && svc->fwmark && unicast) { |
| int ret; |
| struct ip_vs_conn *cp; |
| unsigned int flags = (svc->flags & IP_VS_SVC_F_ONEPACKET && |
| iph->protocol == IPPROTO_UDP) ? |
| IP_VS_CONN_F_ONE_PACKET : 0; |
| union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } }; |
| |
| /* create a new connection entry */ |
| IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__); |
| { |
| struct ip_vs_conn_param p; |
| ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, |
| &iph->saddr, pptr[0], |
| &iph->daddr, pptr[1], &p); |
| cp = ip_vs_conn_new(&p, &daddr, 0, |
| IP_VS_CONN_F_BYPASS | flags, |
| NULL, skb->mark); |
| if (!cp) |
| return NF_DROP; |
| } |
| |
| /* statistics */ |
| ip_vs_in_stats(cp, skb); |
| |
| /* set state */ |
| ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
| |
| /* transmit the first SYN packet */ |
| ret = cp->packet_xmit(skb, cp, pd->pp, iph); |
| /* do not touch skb anymore */ |
| |
| atomic_inc(&cp->in_pkts); |
| ip_vs_conn_put(cp); |
| return ret; |
| } |
| #endif |
| |
| /* |
| * When the virtual ftp service is presented, packets destined |
| * for other services on the VIP may get here (except services |
| * listed in the ipvs table), pass the packets, because it is |
| * not ipvs job to decide to drop the packets. |
| */ |
| if ((svc->port == FTPPORT) && (pptr[1] != FTPPORT)) |
| return NF_ACCEPT; |
| |
| /* |
| * Notify the client that the destination is unreachable, and |
| * release the socket buffer. |
| * Since it is in IP layer, the TCP socket is not actually |
| * created, the TCP RST packet cannot be sent, instead that |
| * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ |
| */ |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (svc->af == AF_INET6) { |
| if (!skb->dev) { |
| struct net *net_ = dev_net(skb_dst(skb)->dev); |
| |
| skb->dev = net_->loopback_dev; |
| } |
| icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
| } else |
| #endif |
| icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
| |
| return NF_DROP; |
| } |
| |
| #ifdef CONFIG_SYSCTL |
| |
| static int sysctl_snat_reroute(struct sk_buff *skb) |
| { |
| struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
| return ipvs->sysctl_snat_reroute; |
| } |
| |
| static int sysctl_nat_icmp_send(struct net *net) |
| { |
| struct netns_ipvs *ipvs = net_ipvs(net); |
| return ipvs->sysctl_nat_icmp_send; |
| } |
| |
| static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) |
| { |
| return ipvs->sysctl_expire_nodest_conn; |
| } |
| |
| #else |
| |
| static int sysctl_snat_reroute(struct sk_buff *skb) { return 0; } |
| static int sysctl_nat_icmp_send(struct net *net) { return 0; } |
| static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) { return 0; } |
| |
| #endif |
| |
| __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset) |
| { |
| return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0)); |
| } |
| |
| static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum) |
| { |
| if (NF_INET_LOCAL_IN == hooknum) |
| return IP_DEFRAG_VS_IN; |
| if (NF_INET_FORWARD == hooknum) |
| return IP_DEFRAG_VS_FWD; |
| return IP_DEFRAG_VS_OUT; |
| } |
| |
| static inline int ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user) |
| { |
| int err; |
| |
| local_bh_disable(); |
| err = ip_defrag(skb, user); |
| local_bh_enable(); |
| if (!err) |
| ip_send_check(ip_hdr(skb)); |
| |
| return err; |
| } |
| |
| static int ip_vs_route_me_harder(int af, struct sk_buff *skb) |
| { |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (af == AF_INET6) { |
| if (sysctl_snat_reroute(skb) && ip6_route_me_harder(skb) != 0) |
| return 1; |
| } else |
| #endif |
| if ((sysctl_snat_reroute(skb) || |
| skb_rtable(skb)->rt_flags & RTCF_LOCAL) && |
| ip_route_me_harder(skb, RTN_LOCAL) != 0) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* |
| * Packet has been made sufficiently writable in caller |
| * - inout: 1=in->out, 0=out->in |
| */ |
| void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, |
| struct ip_vs_conn *cp, int inout) |
| { |
| struct iphdr *iph = ip_hdr(skb); |
| unsigned int icmp_offset = iph->ihl*4; |
| struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) + |
| icmp_offset); |
| struct iphdr *ciph = (struct iphdr *)(icmph + 1); |
| |
| if (inout) { |
| iph->saddr = cp->vaddr.ip; |
| ip_send_check(iph); |
| ciph->daddr = cp->vaddr.ip; |
| ip_send_check(ciph); |
| } else { |
| iph->daddr = cp->daddr.ip; |
| ip_send_check(iph); |
| ciph->saddr = cp->daddr.ip; |
| ip_send_check(ciph); |
| } |
| |
| /* the TCP/UDP/SCTP port */ |
| if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol || |
| IPPROTO_SCTP == ciph->protocol) { |
| __be16 *ports = (void *)ciph + ciph->ihl*4; |
| |
| if (inout) |
| ports[1] = cp->vport; |
| else |
| ports[0] = cp->dport; |
| } |
| |
| /* And finally the ICMP checksum */ |
| icmph->checksum = 0; |
| icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset); |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| |
| if (inout) |
| IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
| "Forwarding altered outgoing ICMP"); |
| else |
| IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
| "Forwarding altered incoming ICMP"); |
| } |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, |
| struct ip_vs_conn *cp, int inout) |
| { |
| struct ipv6hdr *iph = ipv6_hdr(skb); |
| unsigned int icmp_offset = 0; |
| unsigned int offs = 0; /* header offset*/ |
| int protocol; |
| struct icmp6hdr *icmph; |
| struct ipv6hdr *ciph; |
| unsigned short fragoffs; |
| |
| ipv6_find_hdr(skb, &icmp_offset, IPPROTO_ICMPV6, &fragoffs, NULL); |
| icmph = (struct icmp6hdr *)(skb_network_header(skb) + icmp_offset); |
| offs = icmp_offset + sizeof(struct icmp6hdr); |
| ciph = (struct ipv6hdr *)(skb_network_header(skb) + offs); |
| |
| protocol = ipv6_find_hdr(skb, &offs, -1, &fragoffs, NULL); |
| |
| if (inout) { |
| iph->saddr = cp->vaddr.in6; |
| ciph->daddr = cp->vaddr.in6; |
| } else { |
| iph->daddr = cp->daddr.in6; |
| ciph->saddr = cp->daddr.in6; |
| } |
| |
| /* the TCP/UDP/SCTP port */ |
| if (!fragoffs && (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
| IPPROTO_SCTP == protocol)) { |
| __be16 *ports = (void *)(skb_network_header(skb) + offs); |
| |
| IP_VS_DBG(11, "%s() changed port %d to %d\n", __func__, |
| ntohs(inout ? ports[1] : ports[0]), |
| ntohs(inout ? cp->vport : cp->dport)); |
| if (inout) |
| ports[1] = cp->vport; |
| else |
| ports[0] = cp->dport; |
| } |
| |
| /* And finally the ICMP checksum */ |
| icmph->icmp6_cksum = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, |
| skb->len - icmp_offset, |
| IPPROTO_ICMPV6, 0); |
| skb->csum_start = skb_network_header(skb) - skb->head + icmp_offset; |
| skb->csum_offset = offsetof(struct icmp6hdr, icmp6_cksum); |
| skb->ip_summed = CHECKSUM_PARTIAL; |
| |
| if (inout) |
| IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
| (void *)ciph - (void *)iph, |
| "Forwarding altered outgoing ICMPv6"); |
| else |
| IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
| (void *)ciph - (void *)iph, |
| "Forwarding altered incoming ICMPv6"); |
| } |
| #endif |
| |
| /* Handle relevant response ICMP messages - forward to the right |
| * destination host. |
| */ |
| static int handle_response_icmp(int af, struct sk_buff *skb, |
| union nf_inet_addr *snet, |
| __u8 protocol, struct ip_vs_conn *cp, |
| struct ip_vs_protocol *pp, |
| unsigned int offset, unsigned int ihl) |
| { |
| unsigned int verdict = NF_DROP; |
| |
| if (IP_VS_FWD_METHOD(cp) != 0) { |
| pr_err("shouldn't reach here, because the box is on the " |
| "half connection in the tun/dr module.\n"); |
| } |
| |
| /* Ensure the checksum is correct */ |
| if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { |
| /* Failed checksum! */ |
| IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n", |
| IP_VS_DBG_ADDR(af, snet)); |
| goto out; |
| } |
| |
| if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
| IPPROTO_SCTP == protocol) |
| offset += 2 * sizeof(__u16); |
| if (!skb_make_writable(skb, offset)) |
| goto out; |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (af == AF_INET6) |
| ip_vs_nat_icmp_v6(skb, pp, cp, 1); |
| else |
| #endif |
| ip_vs_nat_icmp(skb, pp, cp, 1); |
| |
| if (ip_vs_route_me_harder(af, skb)) |
| goto out; |
| |
| /* do the statistics and put it back */ |
| ip_vs_out_stats(cp, skb); |
| |
| skb->ipvs_property = 1; |
| if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
| ip_vs_notrack(skb); |
| else |
| ip_vs_update_conntrack(skb, cp, 0); |
| verdict = NF_ACCEPT; |
| |
| out: |
| __ip_vs_conn_put(cp); |
| |
| return verdict; |
| } |
| |
| /* |
| * Handle ICMP messages in the inside-to-outside direction (outgoing). |
| * Find any that might be relevant, check against existing connections. |
| * Currently handles error types - unreachable, quench, ttl exceeded. |
| */ |
| static int ip_vs_out_icmp(struct sk_buff *skb, int *related, |
| unsigned int hooknum) |
| { |
| struct iphdr *iph; |
| struct icmphdr _icmph, *ic; |
| struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ |
| struct ip_vs_iphdr ciph; |
| struct ip_vs_conn *cp; |
| struct ip_vs_protocol *pp; |
| unsigned int offset, ihl; |
| union nf_inet_addr snet; |
| |
| *related = 1; |
| |
| /* reassemble IP fragments */ |
| if (ip_is_fragment(ip_hdr(skb))) { |
| if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) |
| return NF_STOLEN; |
| } |
| |
| iph = ip_hdr(skb); |
| offset = ihl = iph->ihl * 4; |
| ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); |
| if (ic == NULL) |
| return NF_DROP; |
| |
| IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n", |
| ic->type, ntohs(icmp_id(ic)), |
| &iph->saddr, &iph->daddr); |
| |
| /* |
| * Work through seeing if this is for us. |
| * These checks are supposed to be in an order that means easy |
| * things are checked first to speed up processing.... however |
| * this means that some packets will manage to get a long way |
| * down this stack and then be rejected, but that's life. |
| */ |
| if ((ic->type != ICMP_DEST_UNREACH) && |
| (ic->type != ICMP_SOURCE_QUENCH) && |
| (ic->type != ICMP_TIME_EXCEEDED)) { |
| *related = 0; |
| return NF_ACCEPT; |
| } |
| |
| /* Now find the contained IP header */ |
| offset += sizeof(_icmph); |
| cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); |
| if (cih == NULL) |
| return NF_ACCEPT; /* The packet looks wrong, ignore */ |
| |
| pp = ip_vs_proto_get(cih->protocol); |
| if (!pp) |
| return NF_ACCEPT; |
| |
| /* Is the embedded protocol header present? */ |
| if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
| pp->dont_defrag)) |
| return NF_ACCEPT; |
| |
| IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
| "Checking outgoing ICMP for"); |
| |
| ip_vs_fill_ip4hdr(cih, &ciph); |
| ciph.len += offset; |
| /* The embedded headers contain source and dest in reverse order */ |
| cp = pp->conn_out_get(AF_INET, skb, &ciph, 1); |
| if (!cp) |
| return NF_ACCEPT; |
| |
| snet.ip = iph->saddr; |
| return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp, |
| pp, ciph.len, ihl); |
| } |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related, |
| unsigned int hooknum, struct ip_vs_iphdr *ipvsh) |
| { |
| struct icmp6hdr _icmph, *ic; |
| struct ipv6hdr _ip6h, *ip6h; /* The ip header contained within ICMP */ |
| struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */ |
| struct ip_vs_conn *cp; |
| struct ip_vs_protocol *pp; |
| union nf_inet_addr snet; |
| unsigned int writable; |
| |
| *related = 1; |
| ic = frag_safe_skb_hp(skb, ipvsh->len, sizeof(_icmph), &_icmph, ipvsh); |
| if (ic == NULL) |
| return NF_DROP; |
| |
| /* |
| * Work through seeing if this is for us. |
| * These checks are supposed to be in an order that means easy |
| * things are checked first to speed up processing.... however |
| * this means that some packets will manage to get a long way |
| * down this stack and then be rejected, but that's life. |
| */ |
| if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) { |
| *related = 0; |
| return NF_ACCEPT; |
| } |
| /* Fragment header that is before ICMP header tells us that: |
| * it's not an error message since they can't be fragmented. |
| */ |
| if (ipvsh->flags & IP6_FH_F_FRAG) |
| return NF_DROP; |
| |
| IP_VS_DBG(8, "Outgoing ICMPv6 (%d,%d) %pI6c->%pI6c\n", |
| ic->icmp6_type, ntohs(icmpv6_id(ic)), |
| &ipvsh->saddr, &ipvsh->daddr); |
| |
| /* Now find the contained IP header */ |
| ciph.len = ipvsh->len + sizeof(_icmph); |
| ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h); |
| if (ip6h == NULL) |
| return NF_ACCEPT; /* The packet looks wrong, ignore */ |
| ciph.saddr.in6 = ip6h->saddr; /* conn_out_get() handles reverse order */ |
| ciph.daddr.in6 = ip6h->daddr; |
| /* skip possible IPv6 exthdrs of contained IPv6 packet */ |
| ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL); |
| if (ciph.protocol < 0) |
| return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */ |
| |
| pp = ip_vs_proto_get(ciph.protocol); |
| if (!pp) |
| return NF_ACCEPT; |
| |
| /* The embedded headers contain source and dest in reverse order */ |
| cp = pp->conn_out_get(AF_INET6, skb, &ciph, 1); |
| if (!cp) |
| return NF_ACCEPT; |
| |
| snet.in6 = ciph.saddr.in6; |
| writable = ciph.len; |
| return handle_response_icmp(AF_INET6, skb, &snet, ciph.protocol, cp, |
| pp, writable, sizeof(struct ipv6hdr)); |
| } |
| #endif |
| |
| /* |
| * Check if sctp chunc is ABORT chunk |
| */ |
| static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len) |
| { |
| sctp_chunkhdr_t *sch, schunk; |
| sch = skb_header_pointer(skb, nh_len + sizeof(sctp_sctphdr_t), |
| sizeof(schunk), &schunk); |
| if (sch == NULL) |
| return 0; |
| if (sch->type == SCTP_CID_ABORT) |
| return 1; |
| return 0; |
| } |
| |
| static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len) |
| { |
| struct tcphdr _tcph, *th; |
| |
| th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph); |
| if (th == NULL) |
| return 0; |
| return th->rst; |
| } |
| |
| static inline bool is_new_conn(const struct sk_buff *skb, |
| struct ip_vs_iphdr *iph) |
| { |
| switch (iph->protocol) { |
| case IPPROTO_TCP: { |
| struct tcphdr _tcph, *th; |
| |
| th = skb_header_pointer(skb, iph->len, sizeof(_tcph), &_tcph); |
| if (th == NULL) |
| return false; |
| return th->syn; |
| } |
| case IPPROTO_SCTP: { |
| sctp_chunkhdr_t *sch, schunk; |
| |
| sch = skb_header_pointer(skb, iph->len + sizeof(sctp_sctphdr_t), |
| sizeof(schunk), &schunk); |
| if (sch == NULL) |
| return false; |
| return sch->type == SCTP_CID_INIT; |
| } |
| default: |
| return false; |
| } |
| } |
| |
| /* Handle response packets: rewrite addresses and send away... |
| */ |
| static unsigned int |
| handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, |
| struct ip_vs_conn *cp, struct ip_vs_iphdr *iph) |
| { |
| struct ip_vs_protocol *pp = pd->pp; |
| |
| IP_VS_DBG_PKT(11, af, pp, skb, 0, "Outgoing packet"); |
| |
| if (!skb_make_writable(skb, iph->len)) |
| goto drop; |
| |
| /* mangle the packet */ |
| if (pp->snat_handler && !pp->snat_handler(skb, pp, cp, iph)) |
| goto drop; |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (af == AF_INET6) |
| ipv6_hdr(skb)->saddr = cp->vaddr.in6; |
| else |
| #endif |
| { |
| ip_hdr(skb)->saddr = cp->vaddr.ip; |
| ip_send_check(ip_hdr(skb)); |
| } |
| |
| /* |
| * nf_iterate does not expect change in the skb->dst->dev. |
| * It looks like it is not fatal to enable this code for hooks |
| * where our handlers are at the end of the chain list and |
| * when all next handlers use skb->dst->dev and not outdev. |
| * It will definitely route properly the inout NAT traffic |
| * when multiple paths are used. |
| */ |
| |
| /* For policy routing, packets originating from this |
| * machine itself may be routed differently to packets |
| * passing through. We want this packet to be routed as |
| * if it came from this machine itself. So re-compute |
| * the routing information. |
| */ |
| if (ip_vs_route_me_harder(af, skb)) |
| goto drop; |
| |
| IP_VS_DBG_PKT(10, af, pp, skb, 0, "After SNAT"); |
| |
| ip_vs_out_stats(cp, skb); |
| ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd); |
| skb->ipvs_property = 1; |
| if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
| ip_vs_notrack(skb); |
| else |
| ip_vs_update_conntrack(skb, cp, 0); |
| ip_vs_conn_put(cp); |
| |
| LeaveFunction(11); |
| return NF_ACCEPT; |
| |
| drop: |
| ip_vs_conn_put(cp); |
| kfree_skb(skb); |
| LeaveFunction(11); |
| return NF_STOLEN; |
| } |
| |
| /* |
| * Check if outgoing packet belongs to the established ip_vs_conn. |
| */ |
| static unsigned int |
| ip_vs_out(unsigned int hooknum, struct sk_buff *skb, int af) |
| { |
| struct net *net = NULL; |
| struct ip_vs_iphdr iph; |
| struct ip_vs_protocol *pp; |
| struct ip_vs_proto_data *pd; |
| struct ip_vs_conn *cp; |
| |
| EnterFunction(11); |
| |
| /* Already marked as IPVS request or reply? */ |
| if (skb->ipvs_property) |
| return NF_ACCEPT; |
| |
| /* Bad... Do not break raw sockets */ |
| if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && |
| af == AF_INET)) { |
| struct sock *sk = skb->sk; |
| struct inet_sock *inet = inet_sk(skb->sk); |
| |
| if (inet && sk->sk_family == PF_INET && inet->nodefrag) |
| return NF_ACCEPT; |
| } |
| |
| if (unlikely(!skb_dst(skb))) |
| return NF_ACCEPT; |
| |
| net = skb_net(skb); |
| if (!net_ipvs(net)->enable) |
| return NF_ACCEPT; |
| |
| ip_vs_fill_iph_skb(af, skb, &iph); |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (af == AF_INET6) { |
| if (!iph.fragoffs && skb_nfct_reasm(skb)) { |
| struct sk_buff *reasm = skb_nfct_reasm(skb); |
| /* Save fw mark for coming frags */ |
| reasm->ipvs_property = 1; |
| reasm->mark = skb->mark; |
| } |
| if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { |
| int related; |
| int verdict = ip_vs_out_icmp_v6(skb, &related, |
| hooknum, &iph); |
| |
| if (related) |
| return verdict; |
| } |
| } else |
| #endif |
| if (unlikely(iph.protocol == IPPROTO_ICMP)) { |
| int related; |
| int verdict = ip_vs_out_icmp(skb, &related, hooknum); |
| |
| if (related) |
| return verdict; |
| } |
| |
| pd = ip_vs_proto_data_get(net, iph.protocol); |
| if (unlikely(!pd)) |
| return NF_ACCEPT; |
| pp = pd->pp; |
| |
| /* reassemble IP fragments */ |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (af == AF_INET) |
| #endif |
| if (unlikely(ip_is_fragment(ip_hdr(skb)) && !pp->dont_defrag)) { |
| if (ip_vs_gather_frags(skb, |
| ip_vs_defrag_user(hooknum))) |
| return NF_STOLEN; |
| |
| ip_vs_fill_ip4hdr(skb_network_header(skb), &iph); |
| } |
| |
| /* |
| * Check if the packet belongs to an existing entry |
| */ |
| cp = pp->conn_out_get(af, skb, &iph, 0); |
| |
| if (likely(cp)) |
| return handle_response(af, skb, pd, cp, &iph); |
| if (sysctl_nat_icmp_send(net) && |
| (pp->protocol == IPPROTO_TCP || |
| pp->protocol == IPPROTO_UDP || |
| pp->protocol == IPPROTO_SCTP)) { |
| __be16 _ports[2], *pptr; |
| |
| pptr = frag_safe_skb_hp(skb, iph.len, |
| sizeof(_ports), _ports, &iph); |
| if (pptr == NULL) |
| return NF_ACCEPT; /* Not for me */ |
| if (ip_vs_has_real_service(net, af, iph.protocol, &iph.saddr, |
| pptr[0])) { |
| /* |
| * Notify the real server: there is no |
| * existing entry if it is not RST |
| * packet or not TCP packet. |
| */ |
| if ((iph.protocol != IPPROTO_TCP && |
| iph.protocol != IPPROTO_SCTP) |
| || ((iph.protocol == IPPROTO_TCP |
| && !is_tcp_reset(skb, iph.len)) |
| || (iph.protocol == IPPROTO_SCTP |
| && !is_sctp_abort(skb, |
| iph.len)))) { |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (af == AF_INET6) { |
| if (!skb->dev) |
| skb->dev = net->loopback_dev; |
| icmpv6_send(skb, |
| ICMPV6_DEST_UNREACH, |
| ICMPV6_PORT_UNREACH, |
| 0); |
| } else |
| #endif |
| icmp_send(skb, |
| ICMP_DEST_UNREACH, |
| ICMP_PORT_UNREACH, 0); |
| return NF_DROP; |
| } |
| } |
| } |
| IP_VS_DBG_PKT(12, af, pp, skb, 0, |
| "ip_vs_out: packet continues traversal as normal"); |
| return NF_ACCEPT; |
| } |
| |
| /* |
| * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
| * used only for VS/NAT. |
| * Check if packet is reply for established ip_vs_conn. |
| */ |
| static unsigned int |
| ip_vs_reply4(unsigned int hooknum, struct sk_buff *skb, |
| const struct net_device *in, const struct net_device *out, |
| int (*okfn)(struct sk_buff *)) |
| { |
| return ip_vs_out(hooknum, skb, AF_INET); |
| } |
| |
| /* |
| * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. |
| * Check if packet is reply for established ip_vs_conn. |
| */ |
| static unsigned int |
| ip_vs_local_reply4(unsigned int hooknum, struct sk_buff *skb, |
| const struct net_device *in, const struct net_device *out, |
| int (*okfn)(struct sk_buff *)) |
| { |
| return ip_vs_out(hooknum, skb, AF_INET); |
| } |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| |
| /* |
| * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
| * used only for VS/NAT. |
| * Check if packet is reply for established ip_vs_conn. |
| */ |
| static unsigned int |
| ip_vs_reply6(unsigned int hooknum, struct sk_buff *skb, |
| const struct net_device *in, const struct net_device *out, |
| int (*okfn)(struct sk_buff *)) |
| { |
| return ip_vs_out(hooknum, skb, AF_INET6); |
| } |
| |
| /* |
| * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. |
| * Check if packet is reply for established ip_vs_conn. |
| */ |
| static unsigned int |
| ip_vs_local_reply6(unsigned int hooknum, struct sk_buff *skb, |
| const struct net_device *in, const struct net_device *out, |
| int (*okfn)(struct sk_buff *)) |
| { |
| return ip_vs_out(hooknum, skb, AF_INET6); |
| } |
| |
| #endif |
| |
| /* |
| * Handle ICMP messages in the outside-to-inside direction (incoming). |
| * Find any that might be relevant, check against existing connections, |
| * forward to the right destination host if relevant. |
| * Currently handles error types - unreachable, quench, ttl exceeded. |
| */ |
| static int |
| ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum) |
| { |
| struct net *net = NULL; |
| struct iphdr *iph; |
| struct icmphdr _icmph, *ic; |
| struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ |
| struct ip_vs_iphdr ciph; |
| struct ip_vs_conn *cp; |
| struct ip_vs_protocol *pp; |
| struct ip_vs_proto_data *pd; |
| unsigned int offset, offset2, ihl, verdict; |
| bool ipip; |
| |
| *related = 1; |
| |
| /* reassemble IP fragments */ |
| if (ip_is_fragment(ip_hdr(skb))) { |
| if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) |
| return NF_STOLEN; |
| } |
| |
| iph = ip_hdr(skb); |
| offset = ihl = iph->ihl * 4; |
| ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); |
| if (ic == NULL) |
| return NF_DROP; |
| |
| IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n", |
| ic->type, ntohs(icmp_id(ic)), |
| &iph->saddr, &iph->daddr); |
| |
| /* |
| * Work through seeing if this is for us. |
| * These checks are supposed to be in an order that means easy |
| * things are checked first to speed up processing.... however |
| * this means that some packets will manage to get a long way |
| * down this stack and then be rejected, but that's life. |
| */ |
| if ((ic->type != ICMP_DEST_UNREACH) && |
| (ic->type != ICMP_SOURCE_QUENCH) && |
| (ic->type != ICMP_TIME_EXCEEDED)) { |
| *related = 0; |
| return NF_ACCEPT; |
| } |
| |
| /* Now find the contained IP header */ |
| offset += sizeof(_icmph); |
| cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); |
| if (cih == NULL) |
| return NF_ACCEPT; /* The packet looks wrong, ignore */ |
| |
| net = skb_net(skb); |
| |
| /* Special case for errors for IPIP packets */ |
| ipip = false; |
| if (cih->protocol == IPPROTO_IPIP) { |
| if (unlikely(cih->frag_off & htons(IP_OFFSET))) |
| return NF_ACCEPT; |
| /* Error for our IPIP must arrive at LOCAL_IN */ |
| if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL)) |
| return NF_ACCEPT; |
| offset += cih->ihl * 4; |
| cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); |
| if (cih == NULL) |
| return NF_ACCEPT; /* The packet looks wrong, ignore */ |
| ipip = true; |
| } |
| |
| pd = ip_vs_proto_data_get(net, cih->protocol); |
| if (!pd) |
| return NF_ACCEPT; |
| pp = pd->pp; |
| |
| /* Is the embedded protocol header present? */ |
| if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
| pp->dont_defrag)) |
| return NF_ACCEPT; |
| |
| IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
| "Checking incoming ICMP for"); |
| |
| offset2 = offset; |
| ip_vs_fill_ip4hdr(cih, &ciph); |
| ciph.len += offset; |
| offset = ciph.len; |
| /* The embedded headers contain source and dest in reverse order. |
| * For IPIP this is error for request, not for reply. |
| */ |
| cp = pp->conn_in_get(AF_INET, skb, &ciph, ipip ? 0 : 1); |
| if (!cp) |
| return NF_ACCEPT; |
| |
| verdict = NF_DROP; |
| |
| /* Ensure the checksum is correct */ |
| if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { |
| /* Failed checksum! */ |
| IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n", |
| &iph->saddr); |
| goto out; |
| } |
| |
| if (ipip) { |
| __be32 info = ic->un.gateway; |
| |
| /* Update the MTU */ |
| if (ic->type == ICMP_DEST_UNREACH && |
| ic->code == ICMP_FRAG_NEEDED) { |
| struct ip_vs_dest *dest = cp->dest; |
| u32 mtu = ntohs(ic->un.frag.mtu); |
| |
| /* Strip outer IP and ICMP, go to IPIP header */ |
| __skb_pull(skb, ihl + sizeof(_icmph)); |
| offset2 -= ihl + sizeof(_icmph); |
| skb_reset_network_header(skb); |
| IP_VS_DBG(12, "ICMP for IPIP %pI4->%pI4: mtu=%u\n", |
| &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, mtu); |
| ipv4_update_pmtu(skb, dev_net(skb->dev), |
| mtu, 0, 0, 0, 0); |
| /* Client uses PMTUD? */ |
| if (!(cih->frag_off & htons(IP_DF))) |
| goto ignore_ipip; |
| /* Prefer the resulting PMTU */ |
| if (dest) { |
| struct ip_vs_dest_dst *dest_dst; |
| |
| rcu_read_lock(); |
| dest_dst = rcu_dereference(dest->dest_dst); |
| if (dest_dst) |
| mtu = dst_mtu(dest_dst->dst_cache); |
| rcu_read_unlock(); |
| } |
| if (mtu > 68 + sizeof(struct iphdr)) |
| mtu -= sizeof(struct iphdr); |
| info = htonl(mtu); |
| } |
| /* Strip outer IP, ICMP and IPIP, go to IP header of |
| * original request. |
| */ |
| __skb_pull(skb, offset2); |
| skb_reset_network_header(skb); |
| IP_VS_DBG(12, "Sending ICMP for %pI4->%pI4: t=%u, c=%u, i=%u\n", |
| &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, |
| ic->type, ic->code, ntohl(info)); |
| icmp_send(skb, ic->type, ic->code, info); |
| /* ICMP can be shorter but anyways, account it */ |
| ip_vs_out_stats(cp, skb); |
| |
| ignore_ipip: |
| consume_skb(skb); |
| verdict = NF_STOLEN; |
| goto out; |
| } |
| |
| /* do the statistics and put it back */ |
| ip_vs_in_stats(cp, skb); |
| if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol) |
| offset += 2 * sizeof(__u16); |
| verdict = ip_vs_icmp_xmit(skb, cp, pp, offset, hooknum, &ciph); |
| |
| out: |
| __ip_vs_conn_put(cp); |
| |
| return verdict; |
| } |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, |
| unsigned int hooknum, struct ip_vs_iphdr *iph) |
| { |
| struct net *net = NULL; |
| struct ipv6hdr _ip6h, *ip6h; |
| struct icmp6hdr _icmph, *ic; |
| struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */ |
| struct ip_vs_conn *cp; |
| struct ip_vs_protocol *pp; |
| struct ip_vs_proto_data *pd; |
| unsigned int offs_ciph, writable, verdict; |
| |
| *related = 1; |
| |
| ic = frag_safe_skb_hp(skb, iph->len, sizeof(_icmph), &_icmph, iph); |
| if (ic == NULL) |
| return NF_DROP; |
| |
| /* |
| * Work through seeing if this is for us. |
| * These checks are supposed to be in an order that means easy |
| * things are checked first to speed up processing.... however |
| * this means that some packets will manage to get a long way |
| * down this stack and then be rejected, but that's life. |
| */ |
| if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) { |
| *related = 0; |
| return NF_ACCEPT; |
| } |
| /* Fragment header that is before ICMP header tells us that: |
| * it's not an error message since they can't be fragmented. |
| */ |
| if (iph->flags & IP6_FH_F_FRAG) |
| return NF_DROP; |
| |
| IP_VS_DBG(8, "Incoming ICMPv6 (%d,%d) %pI6c->%pI6c\n", |
| ic->icmp6_type, ntohs(icmpv6_id(ic)), |
| &iph->saddr, &iph->daddr); |
| |
| /* Now find the contained IP header */ |
| ciph.len = iph->len + sizeof(_icmph); |
| offs_ciph = ciph.len; /* Save ip header offset */ |
| ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h); |
| if (ip6h == NULL) |
| return NF_ACCEPT; /* The packet looks wrong, ignore */ |
| ciph.saddr.in6 = ip6h->saddr; /* conn_in_get() handles reverse order */ |
| ciph.daddr.in6 = ip6h->daddr; |
| /* skip possible IPv6 exthdrs of contained IPv6 packet */ |
| ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL); |
| if (ciph.protocol < 0) |
| return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */ |
| |
| net = skb_net(skb); |
| pd = ip_vs_proto_data_get(net, ciph.protocol); |
| if (!pd) |
| return NF_ACCEPT; |
| pp = pd->pp; |
| |
| /* Cannot handle fragmented embedded protocol */ |
| if (ciph.fragoffs) |
| return NF_ACCEPT; |
| |
| IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offs_ciph, |
| "Checking incoming ICMPv6 for"); |
| |
| /* The embedded headers contain source and dest in reverse order |
| * if not from localhost |
| */ |
| cp = pp->conn_in_get(AF_INET6, skb, &ciph, |
| (hooknum == NF_INET_LOCAL_OUT) ? 0 : 1); |
| |
| if (!cp) |
| return NF_ACCEPT; |
| /* VS/TUN, VS/DR and LOCALNODE just let it go */ |
| if ((hooknum == NF_INET_LOCAL_OUT) && |
| (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)) { |
| __ip_vs_conn_put(cp); |
| return NF_ACCEPT; |
| } |
| |
| /* do the statistics and put it back */ |
| ip_vs_in_stats(cp, skb); |
| |
| /* Need to mangle contained IPv6 header in ICMPv6 packet */ |
| writable = ciph.len; |
| if (IPPROTO_TCP == ciph.protocol || IPPROTO_UDP == ciph.protocol || |
| IPPROTO_SCTP == ciph.protocol) |
| writable += 2 * sizeof(__u16); /* Also mangle ports */ |
| |
| verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, writable, hooknum, &ciph); |
| |
| __ip_vs_conn_put(cp); |
| |
| return verdict; |
| } |
| #endif |
| |
| |
| /* |
| * Check if it's for virtual services, look it up, |
| * and send it on its way... |
| */ |
| static unsigned int |
| ip_vs_in(unsigned int hooknum, struct sk_buff *skb, int af) |
| { |
| struct net *net; |
| struct ip_vs_iphdr iph; |
| struct ip_vs_protocol *pp; |
| struct ip_vs_proto_data *pd; |
| struct ip_vs_conn *cp; |
| int ret, pkts; |
| struct netns_ipvs *ipvs; |
| |
| /* Already marked as IPVS request or reply? */ |
| if (skb->ipvs_property) |
| return NF_ACCEPT; |
| |
| /* |
| * Big tappo: |
| * - remote client: only PACKET_HOST |
| * - route: used for struct net when skb->dev is unset |
| */ |
| if (unlikely((skb->pkt_type != PACKET_HOST && |
| hooknum != NF_INET_LOCAL_OUT) || |
| !skb_dst(skb))) { |
| ip_vs_fill_iph_skb(af, skb, &iph); |
| IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s" |
| " ignored in hook %u\n", |
| skb->pkt_type, iph.protocol, |
| IP_VS_DBG_ADDR(af, &iph.daddr), hooknum); |
| return NF_ACCEPT; |
| } |
| /* ipvs enabled in this netns ? */ |
| net = skb_net(skb); |
| ipvs = net_ipvs(net); |
| if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) |
| return NF_ACCEPT; |
| |
| ip_vs_fill_iph_skb(af, skb, &iph); |
| |
| /* Bad... Do not break raw sockets */ |
| if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && |
| af == AF_INET)) { |
| struct sock *sk = skb->sk; |
| struct inet_sock *inet = inet_sk(skb->sk); |
| |
| if (inet && sk->sk_family == PF_INET && inet->nodefrag) |
| return NF_ACCEPT; |
| } |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (af == AF_INET6) { |
| if (!iph.fragoffs && skb_nfct_reasm(skb)) { |
| struct sk_buff *reasm = skb_nfct_reasm(skb); |
| /* Save fw mark for coming frags. */ |
| reasm->ipvs_property = 1; |
| reasm->mark = skb->mark; |
| } |
| if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { |
| int related; |
| int verdict = ip_vs_in_icmp_v6(skb, &related, hooknum, |
| &iph); |
| |
| if (related) |
| return verdict; |
| } |
| } else |
| #endif |
| if (unlikely(iph.protocol == IPPROTO_ICMP)) { |
| int related; |
| int verdict = ip_vs_in_icmp(skb, &related, hooknum); |
| |
| if (related) |
| return verdict; |
| } |
| |
| /* Protocol supported? */ |
| pd = ip_vs_proto_data_get(net, iph.protocol); |
| if (unlikely(!pd)) |
| return NF_ACCEPT; |
| pp = pd->pp; |
| /* |
| * Check if the packet belongs to an existing connection entry |
| */ |
| cp = pp->conn_in_get(af, skb, &iph, 0); |
| |
| if (unlikely(sysctl_expire_nodest_conn(ipvs)) && cp && cp->dest && |
| unlikely(!atomic_read(&cp->dest->weight)) && !iph.fragoffs && |
| is_new_conn(skb, &iph)) { |
| ip_vs_conn_expire_now(cp); |
| __ip_vs_conn_put(cp); |
| cp = NULL; |
| } |
| |
| if (unlikely(!cp) && !iph.fragoffs) { |
| /* No (second) fragments need to enter here, as nf_defrag_ipv6 |
| * replayed fragment zero will already have created the cp |
| */ |
| int v; |
| |
| /* Schedule and create new connection entry into &cp */ |
| if (!pp->conn_schedule(af, skb, pd, &v, &cp, &iph)) |
| return v; |
| } |
| |
| if (unlikely(!cp)) { |
| /* sorry, all this trouble for a no-hit :) */ |
| IP_VS_DBG_PKT(12, af, pp, skb, 0, |
| "ip_vs_in: packet continues traversal as normal"); |
| if (iph.fragoffs && !skb_nfct_reasm(skb)) { |
| /* Fragment that couldn't be mapped to a conn entry |
| * and don't have any pointer to a reasm skb |
| * is missing module nf_defrag_ipv6 |
| */ |
| IP_VS_DBG_RL("Unhandled frag, load nf_defrag_ipv6\n"); |
| IP_VS_DBG_PKT(7, af, pp, skb, 0, "unhandled fragment"); |
| } |
| return NF_ACCEPT; |
| } |
| |
| IP_VS_DBG_PKT(11, af, pp, skb, 0, "Incoming packet"); |
| /* Check the server status */ |
| if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) { |
| /* the destination server is not available */ |
| |
| if (sysctl_expire_nodest_conn(ipvs)) { |
| /* try to expire the connection immediately */ |
| ip_vs_conn_expire_now(cp); |
| } |
| /* don't restart its timer, and silently |
| drop the packet. */ |
| __ip_vs_conn_put(cp); |
| return NF_DROP; |
| } |
| |
| ip_vs_in_stats(cp, skb); |
| ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
| if (cp->packet_xmit) |
| ret = cp->packet_xmit(skb, cp, pp, &iph); |
| /* do not touch skb anymore */ |
| else { |
| IP_VS_DBG_RL("warning: packet_xmit is null"); |
| ret = NF_ACCEPT; |
| } |
| |
| /* Increase its packet counter and check if it is needed |
| * to be synchronized |
| * |
| * Sync connection if it is about to close to |
| * encorage the standby servers to update the connections timeout |
| * |
| * For ONE_PKT let ip_vs_sync_conn() do the filter work. |
| */ |
| |
| if (cp->flags & IP_VS_CONN_F_ONE_PACKET) |
| pkts = sysctl_sync_threshold(ipvs); |
| else |
| pkts = atomic_add_return(1, &cp->in_pkts); |
| |
| if (ipvs->sync_state & IP_VS_STATE_MASTER) |
| ip_vs_sync_conn(net, cp, pkts); |
| |
| ip_vs_conn_put(cp); |
| return ret; |
| } |
| |
| /* |
| * AF_INET handler in NF_INET_LOCAL_IN chain |
| * Schedule and forward packets from remote clients |
| */ |
| static unsigned int |
| ip_vs_remote_request4(unsigned int hooknum, struct sk_buff *skb, |
| const struct net_device *in, |
| const struct net_device *out, |
| int (*okfn)(struct sk_buff *)) |
| { |
| return ip_vs_in(hooknum, skb, AF_INET); |
| } |
| |
| /* |
| * AF_INET handler in NF_INET_LOCAL_OUT chain |
| * Schedule and forward packets from local clients |
| */ |
| static unsigned int |
| ip_vs_local_request4(unsigned int hooknum, struct sk_buff *skb, |
| const struct net_device *in, const struct net_device *out, |
| int (*okfn)(struct sk_buff *)) |
| { |
| return ip_vs_in(hooknum, skb, AF_INET); |
| } |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| |
| /* |
| * AF_INET6 fragment handling |
| * Copy info from first fragment, to the rest of them. |
| */ |
| static unsigned int |
| ip_vs_preroute_frag6(unsigned int hooknum, struct sk_buff *skb, |
| const struct net_device *in, |
| const struct net_device *out, |
| int (*okfn)(struct sk_buff *)) |
| { |
| struct sk_buff *reasm = skb_nfct_reasm(skb); |
| struct net *net; |
| |
| /* Skip if not a "replay" from nf_ct_frag6_output or first fragment. |
| * ipvs_property is set when checking first fragment |
| * in ip_vs_in() and ip_vs_out(). |
| */ |
| if (reasm) |
| IP_VS_DBG(2, "Fragment recv prop:%d\n", reasm->ipvs_property); |
| if (!reasm || !reasm->ipvs_property) |
| return NF_ACCEPT; |
| |
| net = skb_net(skb); |
| if (!net_ipvs(net)->enable) |
| return NF_ACCEPT; |
| |
| /* Copy stored fw mark, saved in ip_vs_{in,out} */ |
| skb->mark = reasm->mark; |
| |
| return NF_ACCEPT; |
| } |
| |
| /* |
| * AF_INET6 handler in NF_INET_LOCAL_IN chain |
| * Schedule and forward packets from remote clients |
| */ |
| static unsigned int |
| ip_vs_remote_request6(unsigned int hooknum, struct sk_buff *skb, |
| const struct net_device *in, |
| const struct net_device *out, |
| int (*okfn)(struct sk_buff *)) |
| { |
| return ip_vs_in(hooknum, skb, AF_INET6); |
| } |
| |
| /* |
| * AF_INET6 handler in NF_INET_LOCAL_OUT chain |
| * Schedule and forward packets from local clients |
| */ |
| static unsigned int |
| ip_vs_local_request6(unsigned int hooknum, struct sk_buff *skb, |
| const struct net_device *in, const struct net_device *out, |
| int (*okfn)(struct sk_buff *)) |
| { |
| return ip_vs_in(hooknum, skb, AF_INET6); |
| } |
| |
| #endif |
| |
| |
| /* |
| * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP |
| * related packets destined for 0.0.0.0/0. |
| * When fwmark-based virtual service is used, such as transparent |
| * cache cluster, TCP packets can be marked and routed to ip_vs_in, |
| * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and |
| * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain |
| * and send them to ip_vs_in_icmp. |
| */ |
| static unsigned int |
| ip_vs_forward_icmp(unsigned int hooknum, struct sk_buff *skb, |
| const struct net_device *in, const struct net_device *out, |
| int (*okfn)(struct sk_buff *)) |
| { |
| int r; |
| struct net *net; |
| struct netns_ipvs *ipvs; |
| |
| if (ip_hdr(skb)->protocol != IPPROTO_ICMP) |
| return NF_ACCEPT; |
| |
| /* ipvs enabled in this netns ? */ |
| net = skb_net(skb); |
| ipvs = net_ipvs(net); |
| if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) |
| return NF_ACCEPT; |
| |
| return ip_vs_in_icmp(skb, &r, hooknum); |
| } |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| static unsigned int |
| ip_vs_forward_icmp_v6(unsigned int hooknum, struct sk_buff *skb, |
| const struct net_device *in, const struct net_device *out, |
| int (*okfn)(struct sk_buff *)) |
| { |
| int r; |
| struct net *net; |
| struct netns_ipvs *ipvs; |
| struct ip_vs_iphdr iphdr; |
| |
| ip_vs_fill_iph_skb(AF_INET6, skb, &iphdr); |
| if (iphdr.protocol != IPPROTO_ICMPV6) |
| return NF_ACCEPT; |
| |
| /* ipvs enabled in this netns ? */ |
| net = skb_net(skb); |
| ipvs = net_ipvs(net); |
| if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) |
| return NF_ACCEPT; |
| |
| return ip_vs_in_icmp_v6(skb, &r, hooknum, &iphdr); |
| } |
| #endif |
| |
| |
| static struct nf_hook_ops ip_vs_ops[] __read_mostly = { |
| /* After packet filtering, change source only for VS/NAT */ |
| { |
| .hook = ip_vs_reply4, |
| .owner = THIS_MODULE, |
| .pf = NFPROTO_IPV4, |
| .hooknum = NF_INET_LOCAL_IN, |
| .priority = NF_IP_PRI_NAT_SRC - 2, |
| }, |
| /* After packet filtering, forward packet through VS/DR, VS/TUN, |
| * or VS/NAT(change destination), so that filtering rules can be |
| * applied to IPVS. */ |
| { |
| .hook = ip_vs_remote_request4, |
| .owner = THIS_MODULE, |
| .pf = NFPROTO_IPV4, |
| .hooknum = NF_INET_LOCAL_IN, |
| .priority = NF_IP_PRI_NAT_SRC - 1, |
| }, |
| /* Before ip_vs_in, change source only for VS/NAT */ |
| { |
| .hook = ip_vs_local_reply4, |
| .owner = THIS_MODULE, |
| .pf = NFPROTO_IPV4, |
| .hooknum = NF_INET_LOCAL_OUT, |
| .priority = NF_IP_PRI_NAT_DST + 1, |
| }, |
| /* After mangle, schedule and forward local requests */ |
| { |
| .hook = ip_vs_local_request4, |
| .owner = THIS_MODULE, |
| .pf = NFPROTO_IPV4, |
| .hooknum = NF_INET_LOCAL_OUT, |
| .priority = NF_IP_PRI_NAT_DST + 2, |
| }, |
| /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
| * destined for 0.0.0.0/0, which is for incoming IPVS connections */ |
| { |
| .hook = ip_vs_forward_icmp, |
| .owner = THIS_MODULE, |
| .pf = NFPROTO_IPV4, |
| .hooknum = NF_INET_FORWARD, |
| .priority = 99, |
| }, |
| /* After packet filtering, change source only for VS/NAT */ |
| { |
| .hook = ip_vs_reply4, |
| .owner = THIS_MODULE, |
| .pf = NFPROTO_IPV4, |
| .hooknum = NF_INET_FORWARD, |
| .priority = 100, |
| }, |
| #ifdef CONFIG_IP_VS_IPV6 |
| /* After mangle & nat fetch 2:nd fragment and following */ |
| { |
| .hook = ip_vs_preroute_frag6, |
| .owner = THIS_MODULE, |
| .pf = NFPROTO_IPV6, |
| .hooknum = NF_INET_PRE_ROUTING, |
| .priority = NF_IP6_PRI_NAT_DST + 1, |
| }, |
| /* After packet filtering, change source only for VS/NAT */ |
| { |
| .hook = ip_vs_reply6, |
| .owner = THIS_MODULE, |
| .pf = NFPROTO_IPV6, |
| .hooknum = NF_INET_LOCAL_IN, |
| .priority = NF_IP6_PRI_NAT_SRC - 2, |
| }, |
| /* After packet filtering, forward packet through VS/DR, VS/TUN, |
| * or VS/NAT(change destination), so that filtering rules can be |
| * applied to IPVS. */ |
| { |
| .hook = ip_vs_remote_request6, |
| .owner = THIS_MODULE, |
| .pf = NFPROTO_IPV6, |
| .hooknum = NF_INET_LOCAL_IN, |
| .priority = NF_IP6_PRI_NAT_SRC - 1, |
| }, |
| /* Before ip_vs_in, change source only for VS/NAT */ |
| { |
| .hook = ip_vs_local_reply6, |
| .owner = THIS_MODULE, |
| .pf = NFPROTO_IPV4, |
| .hooknum = NF_INET_LOCAL_OUT, |
| .priority = NF_IP6_PRI_NAT_DST + 1, |
| }, |
| /* After mangle, schedule and forward local requests */ |
| { |
| .hook = ip_vs_local_request6, |
| .owner = THIS_MODULE, |
| .pf = NFPROTO_IPV6, |
| .hooknum = NF_INET_LOCAL_OUT, |
| .priority = NF_IP6_PRI_NAT_DST + 2, |
| }, |
| /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
| * destined for 0.0.0.0/0, which is for incoming IPVS connections */ |
| { |
| .hook = ip_vs_forward_icmp_v6, |
| .owner = THIS_MODULE, |
| .pf = NFPROTO_IPV6, |
| .hooknum = NF_INET_FORWARD, |
| .priority = 99, |
| }, |
| /* After packet filtering, change source only for VS/NAT */ |
| { |
| .hook = ip_vs_reply6, |
| .owner = THIS_MODULE, |
| .pf = NFPROTO_IPV6, |
| .hooknum = NF_INET_FORWARD, |
| .priority = 100, |
| }, |
| #endif |
| }; |
| /* |
| * Initialize IP Virtual Server netns mem. |
| */ |
| static int __net_init __ip_vs_init(struct net *net) |
| { |
| struct netns_ipvs *ipvs; |
| |
| ipvs = net_generic(net, ip_vs_net_id); |
| if (ipvs == NULL) |
| return -ENOMEM; |
| |
| /* Hold the beast until a service is registerd */ |
| ipvs->enable = 0; |
| ipvs->net = net; |
| /* Counters used for creating unique names */ |
| ipvs->gen = atomic_read(&ipvs_netns_cnt); |
| atomic_inc(&ipvs_netns_cnt); |
| net->ipvs = ipvs; |
| |
| if (ip_vs_estimator_net_init(net) < 0) |
| goto estimator_fail; |
| |
| if (ip_vs_control_net_init(net) < 0) |
| goto control_fail; |
| |
| if (ip_vs_protocol_net_init(net) < 0) |
| goto protocol_fail; |
| |
| if (ip_vs_app_net_init(net) < 0) |
| goto app_fail; |
| |
| if (ip_vs_conn_net_init(net) < 0) |
| goto conn_fail; |
| |
| if (ip_vs_sync_net_init(net) < 0) |
| goto sync_fail; |
| |
| printk(KERN_INFO "IPVS: Creating netns size=%zu id=%d\n", |
| sizeof(struct netns_ipvs), ipvs->gen); |
| return 0; |
| /* |
| * Error handling |
| */ |
| |
| sync_fail: |
| ip_vs_conn_net_cleanup(net); |
| conn_fail: |
| ip_vs_app_net_cleanup(net); |
| app_fail: |
| ip_vs_protocol_net_cleanup(net); |
| protocol_fail: |
| ip_vs_control_net_cleanup(net); |
| control_fail: |
| ip_vs_estimator_net_cleanup(net); |
| estimator_fail: |
| net->ipvs = NULL; |
| return -ENOMEM; |
| } |
| |
| static void __net_exit __ip_vs_cleanup(struct net *net) |
| { |
| ip_vs_service_net_cleanup(net); /* ip_vs_flush() with locks */ |
| ip_vs_conn_net_cleanup(net); |
| ip_vs_app_net_cleanup(net); |
| ip_vs_protocol_net_cleanup(net); |
| ip_vs_control_net_cleanup(net); |
| ip_vs_estimator_net_cleanup(net); |
| IP_VS_DBG(2, "ipvs netns %d released\n", net_ipvs(net)->gen); |
| net->ipvs = NULL; |
| } |
| |
| static void __net_exit __ip_vs_dev_cleanup(struct net *net) |
| { |
| EnterFunction(2); |
| net_ipvs(net)->enable = 0; /* Disable packet reception */ |
| smp_wmb(); |
| ip_vs_sync_net_cleanup(net); |
| LeaveFunction(2); |
| } |
| |
| static struct pernet_operations ipvs_core_ops = { |
| .init = __ip_vs_init, |
| .exit = __ip_vs_cleanup, |
| .id = &ip_vs_net_id, |
| .size = sizeof(struct netns_ipvs), |
| }; |
| |
| static struct pernet_operations ipvs_core_dev_ops = { |
| .exit = __ip_vs_dev_cleanup, |
| }; |
| |
| /* |
| * Initialize IP Virtual Server |
| */ |
| static int __init ip_vs_init(void) |
| { |
| int ret; |
| |
| ret = ip_vs_control_init(); |
| if (ret < 0) { |
| pr_err("can't setup control.\n"); |
| goto exit; |
| } |
| |
| ip_vs_protocol_init(); |
| |
| ret = ip_vs_conn_init(); |
| if (ret < 0) { |
| pr_err("can't setup connection table.\n"); |
| goto cleanup_protocol; |
| } |
| |
| ret = register_pernet_subsys(&ipvs_core_ops); /* Alloc ip_vs struct */ |
| if (ret < 0) |
| goto cleanup_conn; |
| |
| ret = register_pernet_device(&ipvs_core_dev_ops); |
| if (ret < 0) |
| goto cleanup_sub; |
| |
| ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
| if (ret < 0) { |
| pr_err("can't register hooks.\n"); |
| goto cleanup_dev; |
| } |
| |
| ret = ip_vs_register_nl_ioctl(); |
| if (ret < 0) { |
| pr_err("can't register netlink/ioctl.\n"); |
| goto cleanup_hooks; |
| } |
| |
| pr_info("ipvs loaded.\n"); |
| |
| return ret; |
| |
| cleanup_hooks: |
| nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
| cleanup_dev: |
| unregister_pernet_device(&ipvs_core_dev_ops); |
| cleanup_sub: |
| unregister_pernet_subsys(&ipvs_core_ops); |
| cleanup_conn: |
| ip_vs_conn_cleanup(); |
| cleanup_protocol: |
| ip_vs_protocol_cleanup(); |
| ip_vs_control_cleanup(); |
| exit: |
| return ret; |
| } |
| |
| static void __exit ip_vs_cleanup(void) |
| { |
| ip_vs_unregister_nl_ioctl(); |
| nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
| unregister_pernet_device(&ipvs_core_dev_ops); |
| unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */ |
| ip_vs_conn_cleanup(); |
| ip_vs_protocol_cleanup(); |
| ip_vs_control_cleanup(); |
| pr_info("ipvs unloaded.\n"); |
| } |
| |
| module_init(ip_vs_init); |
| module_exit(ip_vs_cleanup); |
| MODULE_LICENSE("GPL"); |