Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ip_vs_xmit.c: various packet transmitters for IPVS |
| 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
| 5 | * Julian Anastasov <ja@ssi.bg> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * Changes: |
| 13 | * |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 14 | * Description of forwarding methods: |
| 15 | * - all transmitters are called from LOCAL_IN (remote clients) and |
| 16 | * LOCAL_OUT (local clients) but for ICMP can be called from FORWARD |
| 17 | * - not all connections have destination server, for example, |
| 18 | * connections in backup server when fwmark is used |
| 19 | * - bypass connections use daddr from packet |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 20 | * - we can use dst without ref while sending in RCU section, we use |
| 21 | * ref when returning NF_ACCEPT for NAT-ed packet via loopback |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 22 | * LOCAL_OUT rules: |
| 23 | * - skb->dev is NULL, skb->protocol is not set (both are set in POST_ROUTING) |
| 24 | * - skb->pkt_type is not set yet |
| 25 | * - the only place where we can see skb->sk != NULL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | */ |
| 27 | |
Hannes Eder | 9aada7a | 2009-07-30 14:29:44 -0700 | [diff] [blame] | 28 | #define KMSG_COMPONENT "IPVS" |
| 29 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/tcp.h> /* for tcphdr */ |
Herbert Xu | c439cb2 | 2008-01-11 19:14:00 -0800 | [diff] [blame] | 34 | #include <net/ip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <net/tcp.h> /* for csum_tcpudp_magic */ |
| 36 | #include <net/udp.h> |
| 37 | #include <net/icmp.h> /* for icmp_send */ |
| 38 | #include <net/route.h> /* for ip_route_output */ |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 39 | #include <net/ipv6.h> |
| 40 | #include <net/ip6_route.h> |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 41 | #include <net/addrconf.h> |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 42 | #include <linux/icmpv6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/netfilter.h> |
| 44 | #include <linux/netfilter_ipv4.h> |
| 45 | |
| 46 | #include <net/ip_vs.h> |
| 47 | |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 48 | enum { |
| 49 | IP_VS_RT_MODE_LOCAL = 1, /* Allow local dest */ |
| 50 | IP_VS_RT_MODE_NON_LOCAL = 2, /* Allow non-local dest */ |
| 51 | IP_VS_RT_MODE_RDR = 4, /* Allow redirect from remote daddr to |
| 52 | * local |
| 53 | */ |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 54 | IP_VS_RT_MODE_CONNECT = 8, /* Always bind route to saddr */ |
Julian Anastasov | ad4d3ef | 2012-10-08 11:41:20 +0000 | [diff] [blame] | 55 | IP_VS_RT_MODE_KNOWN_NH = 16,/* Route via remote addr */ |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 56 | IP_VS_RT_MODE_TUNNEL = 32,/* Tunnel mode */ |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 57 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 59 | static inline struct ip_vs_dest_dst *ip_vs_dest_dst_alloc(void) |
| 60 | { |
| 61 | return kmalloc(sizeof(struct ip_vs_dest_dst), GFP_ATOMIC); |
| 62 | } |
| 63 | |
| 64 | static inline void ip_vs_dest_dst_free(struct ip_vs_dest_dst *dest_dst) |
| 65 | { |
| 66 | kfree(dest_dst); |
| 67 | } |
| 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | /* |
| 70 | * Destination cache to speed up outgoing route lookup |
| 71 | */ |
| 72 | static inline void |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 73 | __ip_vs_dst_set(struct ip_vs_dest *dest, struct ip_vs_dest_dst *dest_dst, |
| 74 | struct dst_entry *dst, u32 dst_cookie) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | { |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 76 | struct ip_vs_dest_dst *old; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 78 | old = rcu_dereference_protected(dest->dest_dst, |
| 79 | lockdep_is_held(&dest->dst_lock)); |
| 80 | |
| 81 | if (dest_dst) { |
| 82 | dest_dst->dst_cache = dst; |
| 83 | dest_dst->dst_cookie = dst_cookie; |
| 84 | } |
| 85 | rcu_assign_pointer(dest->dest_dst, dest_dst); |
| 86 | |
| 87 | if (old) |
| 88 | call_rcu(&old->rcu_head, ip_vs_dest_dst_rcu_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | } |
| 90 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 91 | static inline struct ip_vs_dest_dst * |
Julian Anastasov | c90558d | 2013-03-21 11:57:59 +0200 | [diff] [blame] | 92 | __ip_vs_dst_check(struct ip_vs_dest *dest) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | { |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 94 | struct ip_vs_dest_dst *dest_dst = rcu_dereference(dest->dest_dst); |
| 95 | struct dst_entry *dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 97 | if (!dest_dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | return NULL; |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 99 | dst = dest_dst->dst_cache; |
| 100 | if (dst->obsolete && |
| 101 | dst->ops->check(dst, dest_dst->dst_cookie) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | return NULL; |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 103 | return dest_dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | } |
| 105 | |
Jesper Dangaard Brouer | 590e3f7 | 2012-08-28 22:05:51 +0200 | [diff] [blame] | 106 | static inline bool |
| 107 | __mtu_check_toobig_v6(const struct sk_buff *skb, u32 mtu) |
| 108 | { |
Patrick McHardy | 4cdd3408 | 2012-08-26 19:13:58 +0200 | [diff] [blame] | 109 | if (IP6CB(skb)->frag_max_size) { |
| 110 | /* frag_max_size tell us that, this packet have been |
| 111 | * defragmented by netfilter IPv6 conntrack module. |
| 112 | */ |
| 113 | if (IP6CB(skb)->frag_max_size > mtu) |
| 114 | return true; /* largest fragment violate MTU */ |
| 115 | } |
| 116 | else if (skb->len > mtu && !skb_is_gso(skb)) { |
Jesper Dangaard Brouer | 590e3f7 | 2012-08-28 22:05:51 +0200 | [diff] [blame] | 117 | return true; /* Packet size violate MTU size */ |
| 118 | } |
| 119 | return false; |
| 120 | } |
| 121 | |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 122 | /* Get route to daddr, update *saddr, optionally bind route to saddr */ |
| 123 | static struct rtable *do_output_route4(struct net *net, __be32 daddr, |
Julian Anastasov | c90558d | 2013-03-21 11:57:59 +0200 | [diff] [blame] | 124 | int rt_mode, __be32 *saddr) |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 125 | { |
| 126 | struct flowi4 fl4; |
| 127 | struct rtable *rt; |
| 128 | int loop = 0; |
| 129 | |
| 130 | memset(&fl4, 0, sizeof(fl4)); |
| 131 | fl4.daddr = daddr; |
| 132 | fl4.saddr = (rt_mode & IP_VS_RT_MODE_CONNECT) ? *saddr : 0; |
Julian Anastasov | ad4d3ef | 2012-10-08 11:41:20 +0000 | [diff] [blame] | 133 | fl4.flowi4_flags = (rt_mode & IP_VS_RT_MODE_KNOWN_NH) ? |
| 134 | FLOWI_FLAG_KNOWN_NH : 0; |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 135 | |
| 136 | retry: |
| 137 | rt = ip_route_output_key(net, &fl4); |
| 138 | if (IS_ERR(rt)) { |
| 139 | /* Invalid saddr ? */ |
| 140 | if (PTR_ERR(rt) == -EINVAL && *saddr && |
| 141 | rt_mode & IP_VS_RT_MODE_CONNECT && !loop) { |
| 142 | *saddr = 0; |
Julian Anastasov | c90558d | 2013-03-21 11:57:59 +0200 | [diff] [blame] | 143 | flowi4_update_output(&fl4, 0, 0, daddr, 0); |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 144 | goto retry; |
| 145 | } |
| 146 | IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n", &daddr); |
| 147 | return NULL; |
| 148 | } else if (!*saddr && rt_mode & IP_VS_RT_MODE_CONNECT && fl4.saddr) { |
| 149 | ip_rt_put(rt); |
| 150 | *saddr = fl4.saddr; |
Julian Anastasov | c90558d | 2013-03-21 11:57:59 +0200 | [diff] [blame] | 151 | flowi4_update_output(&fl4, 0, 0, daddr, fl4.saddr); |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 152 | loop++; |
| 153 | goto retry; |
| 154 | } |
| 155 | *saddr = fl4.saddr; |
| 156 | return rt; |
| 157 | } |
| 158 | |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 159 | /* Get route to destination or remote server */ |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 160 | static int |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 161 | __ip_vs_get_out_rt(struct sk_buff *skb, struct ip_vs_dest *dest, |
Julian Anastasov | c90558d | 2013-03-21 11:57:59 +0200 | [diff] [blame] | 162 | __be32 daddr, int rt_mode, __be32 *ret_saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | { |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 164 | struct net *net = dev_net(skb_dst(skb)->dev); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 165 | struct netns_ipvs *ipvs = net_ipvs(net); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 166 | struct ip_vs_dest_dst *dest_dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | struct rtable *rt; /* Route to the other host */ |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 168 | struct rtable *ort; /* Original route */ |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 169 | struct iphdr *iph; |
| 170 | __be16 df; |
| 171 | int mtu; |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 172 | int local, noref = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
| 174 | if (dest) { |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 175 | dest_dst = __ip_vs_dst_check(dest); |
| 176 | if (likely(dest_dst)) |
| 177 | rt = (struct rtable *) dest_dst->dst_cache; |
| 178 | else { |
| 179 | dest_dst = ip_vs_dest_dst_alloc(); |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 180 | spin_lock_bh(&dest->dst_lock); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 181 | if (!dest_dst) { |
| 182 | __ip_vs_dst_set(dest, NULL, NULL, 0); |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 183 | spin_unlock_bh(&dest->dst_lock); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 184 | goto err_unreach; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | } |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 186 | rt = do_output_route4(net, dest->addr.ip, rt_mode, |
| 187 | &dest_dst->dst_saddr.ip); |
| 188 | if (!rt) { |
| 189 | __ip_vs_dst_set(dest, NULL, NULL, 0); |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 190 | spin_unlock_bh(&dest->dst_lock); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 191 | ip_vs_dest_dst_free(dest_dst); |
| 192 | goto err_unreach; |
| 193 | } |
| 194 | __ip_vs_dst_set(dest, dest_dst, &rt->dst, 0); |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 195 | spin_unlock_bh(&dest->dst_lock); |
Julian Anastasov | c90558d | 2013-03-21 11:57:59 +0200 | [diff] [blame] | 196 | IP_VS_DBG(10, "new dst %pI4, src %pI4, refcnt=%d\n", |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 197 | &dest->addr.ip, &dest_dst->dst_saddr.ip, |
Julian Anastasov | c90558d | 2013-03-21 11:57:59 +0200 | [diff] [blame] | 198 | atomic_read(&rt->dst.__refcnt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | } |
David S. Miller | 44e3125 | 2011-05-09 14:38:06 -0700 | [diff] [blame] | 200 | daddr = dest->addr.ip; |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 201 | if (ret_saddr) |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 202 | *ret_saddr = dest_dst->dst_saddr.ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | } else { |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 204 | __be32 saddr = htonl(INADDR_ANY); |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 205 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 206 | noref = 0; |
| 207 | |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 208 | /* For such unconfigured boxes avoid many route lookups |
| 209 | * for performance reasons because we do not remember saddr |
| 210 | */ |
| 211 | rt_mode &= ~IP_VS_RT_MODE_CONNECT; |
Julian Anastasov | c90558d | 2013-03-21 11:57:59 +0200 | [diff] [blame] | 212 | rt = do_output_route4(net, daddr, rt_mode, &saddr); |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 213 | if (!rt) |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 214 | goto err_unreach; |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 215 | if (ret_saddr) |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 216 | *ret_saddr = saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
| 218 | |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 219 | local = (rt->rt_flags & RTCF_LOCAL) ? 1 : 0; |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 220 | if (!((local ? IP_VS_RT_MODE_LOCAL : IP_VS_RT_MODE_NON_LOCAL) & |
| 221 | rt_mode)) { |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 222 | IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI4\n", |
| 223 | (rt->rt_flags & RTCF_LOCAL) ? |
David S. Miller | 44e3125 | 2011-05-09 14:38:06 -0700 | [diff] [blame] | 224 | "local":"non-local", &daddr); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 225 | goto err_put; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 226 | } |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 227 | iph = ip_hdr(skb); |
| 228 | if (likely(!local)) { |
| 229 | if (unlikely(ipv4_is_loopback(iph->saddr))) { |
| 230 | IP_VS_DBG_RL("Stopping traffic from loopback address " |
| 231 | "%pI4 to non-local address, dest: %pI4\n", |
| 232 | &iph->saddr, &daddr); |
| 233 | goto err_put; |
| 234 | } |
| 235 | } else { |
| 236 | ort = skb_rtable(skb); |
| 237 | if (!(rt_mode & IP_VS_RT_MODE_RDR) && |
| 238 | !(ort->rt_flags & RTCF_LOCAL)) { |
| 239 | IP_VS_DBG_RL("Redirect from non-local address %pI4 to " |
| 240 | "local requires NAT method, dest: %pI4\n", |
| 241 | &iph->daddr, &daddr); |
| 242 | goto err_put; |
| 243 | } |
| 244 | /* skb to local stack, preserve old route */ |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 245 | if (!noref) |
| 246 | ip_rt_put(rt); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 247 | return local; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 248 | } |
| 249 | |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 250 | if (likely(!(rt_mode & IP_VS_RT_MODE_TUNNEL))) { |
| 251 | mtu = dst_mtu(&rt->dst); |
| 252 | df = iph->frag_off & htons(IP_DF); |
| 253 | } else { |
| 254 | struct sock *sk = skb->sk; |
| 255 | |
| 256 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
| 257 | if (mtu < 68) { |
| 258 | IP_VS_DBG_RL("%s(): mtu less than 68\n", __func__); |
| 259 | goto err_put; |
| 260 | } |
| 261 | ort = skb_rtable(skb); |
| 262 | if (!skb->dev && sk && sk->sk_state != TCP_TIME_WAIT) |
| 263 | ort->dst.ops->update_pmtu(&ort->dst, sk, NULL, mtu); |
| 264 | /* MTU check allowed? */ |
| 265 | df = sysctl_pmtu_disc(ipvs) ? iph->frag_off & htons(IP_DF) : 0; |
| 266 | } |
| 267 | |
| 268 | /* MTU checking */ |
| 269 | if (unlikely(df && skb->len > mtu && !skb_is_gso(skb))) { |
| 270 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); |
| 271 | IP_VS_DBG(1, "frag needed for %pI4\n", &iph->saddr); |
| 272 | goto err_put; |
| 273 | } |
| 274 | |
| 275 | skb_dst_drop(skb); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 276 | if (noref) { |
| 277 | if (!local) |
| 278 | skb_dst_set_noref_force(skb, &rt->dst); |
| 279 | else |
| 280 | skb_dst_set(skb, dst_clone(&rt->dst)); |
| 281 | } else |
| 282 | skb_dst_set(skb, &rt->dst); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 283 | |
| 284 | return local; |
| 285 | |
| 286 | err_put: |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 287 | if (!noref) |
| 288 | ip_rt_put(rt); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 289 | return -1; |
| 290 | |
| 291 | err_unreach: |
| 292 | dst_link_failure(skb); |
| 293 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 296 | #ifdef CONFIG_IP_VS_IPV6 |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 297 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 298 | static inline int __ip_vs_is_local_route6(struct rt6_info *rt) |
| 299 | { |
David S. Miller | d191854 | 2011-12-28 20:19:20 -0500 | [diff] [blame] | 300 | return rt->dst.dev && rt->dst.dev->flags & IFF_LOOPBACK; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 301 | } |
| 302 | |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 303 | static struct dst_entry * |
| 304 | __ip_vs_route_output_v6(struct net *net, struct in6_addr *daddr, |
| 305 | struct in6_addr *ret_saddr, int do_xfrm) |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 306 | { |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 307 | struct dst_entry *dst; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 308 | struct flowi6 fl6 = { |
| 309 | .daddr = *daddr, |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 310 | }; |
| 311 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 312 | dst = ip6_route_output(net, NULL, &fl6); |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 313 | if (dst->error) |
| 314 | goto out_err; |
| 315 | if (!ret_saddr) |
| 316 | return dst; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 317 | if (ipv6_addr_any(&fl6.saddr) && |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 318 | ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 319 | &fl6.daddr, 0, &fl6.saddr) < 0) |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 320 | goto out_err; |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 321 | if (do_xfrm) { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 322 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 323 | if (IS_ERR(dst)) { |
| 324 | dst = NULL; |
| 325 | goto out_err; |
| 326 | } |
| 327 | } |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 328 | *ret_saddr = fl6.saddr; |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 329 | return dst; |
| 330 | |
| 331 | out_err: |
| 332 | dst_release(dst); |
| 333 | IP_VS_DBG_RL("ip6_route_output error, dest: %pI6\n", daddr); |
| 334 | return NULL; |
| 335 | } |
| 336 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 337 | /* |
| 338 | * Get route to destination or remote server |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 339 | */ |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 340 | static int |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 341 | __ip_vs_get_out_rt_v6(struct sk_buff *skb, struct ip_vs_dest *dest, |
| 342 | struct in6_addr *daddr, struct in6_addr *ret_saddr, |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 343 | struct ip_vs_iphdr *ipvsh, int do_xfrm, int rt_mode) |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 344 | { |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 345 | struct net *net = dev_net(skb_dst(skb)->dev); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 346 | struct ip_vs_dest_dst *dest_dst; |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 347 | struct rt6_info *rt; /* Route to the other host */ |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 348 | struct rt6_info *ort; /* Original route */ |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 349 | struct dst_entry *dst; |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 350 | int mtu; |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 351 | int local, noref = 1; |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 352 | |
| 353 | if (dest) { |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 354 | dest_dst = __ip_vs_dst_check(dest); |
| 355 | if (likely(dest_dst)) |
| 356 | rt = (struct rt6_info *) dest_dst->dst_cache; |
| 357 | else { |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 358 | u32 cookie; |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 359 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 360 | dest_dst = ip_vs_dest_dst_alloc(); |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 361 | spin_lock_bh(&dest->dst_lock); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 362 | if (!dest_dst) { |
| 363 | __ip_vs_dst_set(dest, NULL, NULL, 0); |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 364 | spin_unlock_bh(&dest->dst_lock); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 365 | goto err_unreach; |
| 366 | } |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 367 | dst = __ip_vs_route_output_v6(net, &dest->addr.in6, |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 368 | &dest_dst->dst_saddr.in6, |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 369 | do_xfrm); |
| 370 | if (!dst) { |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 371 | __ip_vs_dst_set(dest, NULL, NULL, 0); |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 372 | spin_unlock_bh(&dest->dst_lock); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 373 | ip_vs_dest_dst_free(dest_dst); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 374 | goto err_unreach; |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 375 | } |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 376 | rt = (struct rt6_info *) dst; |
| 377 | cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 378 | __ip_vs_dst_set(dest, dest_dst, &rt->dst, cookie); |
Julian Anastasov | ac69269 | 2013-03-22 11:46:54 +0200 | [diff] [blame] | 379 | spin_unlock_bh(&dest->dst_lock); |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 380 | IP_VS_DBG(10, "new dst %pI6, src %pI6, refcnt=%d\n", |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 381 | &dest->addr.in6, &dest_dst->dst_saddr.in6, |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 382 | atomic_read(&rt->dst.__refcnt)); |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 383 | } |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 384 | if (ret_saddr) |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 385 | *ret_saddr = dest_dst->dst_saddr.in6; |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 386 | } else { |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 387 | noref = 0; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 388 | dst = __ip_vs_route_output_v6(net, daddr, ret_saddr, do_xfrm); |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 389 | if (!dst) |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 390 | goto err_unreach; |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 391 | rt = (struct rt6_info *) dst; |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 392 | } |
| 393 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 394 | local = __ip_vs_is_local_route6(rt); |
David S. Miller | e58b344 | 2011-05-12 18:22:34 -0400 | [diff] [blame] | 395 | if (!((local ? IP_VS_RT_MODE_LOCAL : IP_VS_RT_MODE_NON_LOCAL) & |
| 396 | rt_mode)) { |
Jesper Dangaard Brouer | 120b9c1 | 2012-09-26 14:05:53 +0200 | [diff] [blame] | 397 | IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI6c\n", |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 398 | local ? "local":"non-local", daddr); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 399 | goto err_put; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 400 | } |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 401 | if (likely(!local)) { |
| 402 | if (unlikely((!skb->dev || skb->dev->flags & IFF_LOOPBACK) && |
| 403 | ipv6_addr_type(&ipv6_hdr(skb)->saddr) & |
| 404 | IPV6_ADDR_LOOPBACK)) { |
| 405 | IP_VS_DBG_RL("Stopping traffic from loopback address " |
| 406 | "%pI6c to non-local address, " |
| 407 | "dest: %pI6c\n", |
| 408 | &ipv6_hdr(skb)->saddr, daddr); |
| 409 | goto err_put; |
| 410 | } |
| 411 | } else { |
| 412 | ort = (struct rt6_info *) skb_dst(skb); |
| 413 | if (!(rt_mode & IP_VS_RT_MODE_RDR) && |
| 414 | !__ip_vs_is_local_route6(ort)) { |
| 415 | IP_VS_DBG_RL("Redirect from non-local address %pI6c " |
| 416 | "to local requires NAT method, " |
| 417 | "dest: %pI6c\n", |
| 418 | &ipv6_hdr(skb)->daddr, daddr); |
| 419 | goto err_put; |
| 420 | } |
| 421 | /* skb to local stack, preserve old route */ |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 422 | if (!noref) |
| 423 | dst_release(&rt->dst); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 424 | return local; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 425 | } |
| 426 | |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 427 | /* MTU checking */ |
| 428 | if (likely(!(rt_mode & IP_VS_RT_MODE_TUNNEL))) |
| 429 | mtu = dst_mtu(&rt->dst); |
| 430 | else { |
| 431 | struct sock *sk = skb->sk; |
| 432 | |
| 433 | mtu = dst_mtu(&rt->dst) - sizeof(struct ipv6hdr); |
| 434 | if (mtu < IPV6_MIN_MTU) { |
| 435 | IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__, |
| 436 | IPV6_MIN_MTU); |
| 437 | goto err_put; |
| 438 | } |
| 439 | ort = (struct rt6_info *) skb_dst(skb); |
| 440 | if (!skb->dev && sk && sk->sk_state != TCP_TIME_WAIT) |
| 441 | ort->dst.ops->update_pmtu(&ort->dst, sk, NULL, mtu); |
| 442 | } |
| 443 | |
| 444 | if (unlikely(__mtu_check_toobig_v6(skb, mtu))) { |
| 445 | if (!skb->dev) |
| 446 | skb->dev = net->loopback_dev; |
| 447 | /* only send ICMP too big on first fragment */ |
| 448 | if (!ipvsh->fragoffs) |
| 449 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
| 450 | IP_VS_DBG(1, "frag needed for %pI6c\n", &ipv6_hdr(skb)->saddr); |
| 451 | goto err_put; |
| 452 | } |
| 453 | |
| 454 | skb_dst_drop(skb); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 455 | if (noref) { |
| 456 | if (!local) |
| 457 | skb_dst_set_noref_force(skb, &rt->dst); |
| 458 | else |
| 459 | skb_dst_set(skb, dst_clone(&rt->dst)); |
| 460 | } else |
| 461 | skb_dst_set(skb, &rt->dst); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 462 | |
| 463 | return local; |
| 464 | |
| 465 | err_put: |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 466 | if (!noref) |
| 467 | dst_release(&rt->dst); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 468 | return -1; |
| 469 | |
| 470 | err_unreach: |
| 471 | dst_link_failure(skb); |
| 472 | return -1; |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 473 | } |
| 474 | #endif |
| 475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 477 | /* return NF_ACCEPT to allow forwarding or other NF_xxx on error */ |
| 478 | static inline int ip_vs_tunnel_xmit_prepare(struct sk_buff *skb, |
| 479 | struct ip_vs_conn *cp) |
| 480 | { |
| 481 | int ret = NF_ACCEPT; |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 482 | |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 483 | skb->ipvs_property = 1; |
| 484 | if (unlikely(cp->flags & IP_VS_CONN_F_NFCT)) |
| 485 | ret = ip_vs_confirm_conntrack(skb); |
| 486 | if (ret == NF_ACCEPT) { |
| 487 | nf_reset(skb); |
| 488 | skb_forward_csum(skb); |
| 489 | } |
| 490 | return ret; |
| 491 | } |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 492 | |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 493 | /* return NF_STOLEN (sent) or NF_ACCEPT if local=1 (not sent) */ |
| 494 | static inline int ip_vs_nat_send_or_cont(int pf, struct sk_buff *skb, |
| 495 | struct ip_vs_conn *cp, int local) |
| 496 | { |
| 497 | int ret = NF_STOLEN; |
| 498 | |
| 499 | skb->ipvs_property = 1; |
| 500 | if (likely(!(cp->flags & IP_VS_CONN_F_NFCT))) |
| 501 | ip_vs_notrack(skb); |
| 502 | else |
| 503 | ip_vs_update_conntrack(skb, cp, 1); |
| 504 | if (!local) { |
| 505 | skb_forward_csum(skb); |
| 506 | NF_HOOK(pf, NF_INET_LOCAL_OUT, skb, NULL, skb_dst(skb)->dev, |
| 507 | dst_output); |
| 508 | } else |
| 509 | ret = NF_ACCEPT; |
| 510 | return ret; |
| 511 | } |
| 512 | |
| 513 | /* return NF_STOLEN (sent) or NF_ACCEPT if local=1 (not sent) */ |
| 514 | static inline int ip_vs_send_or_cont(int pf, struct sk_buff *skb, |
| 515 | struct ip_vs_conn *cp, int local) |
| 516 | { |
| 517 | int ret = NF_STOLEN; |
| 518 | |
| 519 | skb->ipvs_property = 1; |
| 520 | if (likely(!(cp->flags & IP_VS_CONN_F_NFCT))) |
| 521 | ip_vs_notrack(skb); |
| 522 | if (!local) { |
| 523 | skb_forward_csum(skb); |
| 524 | NF_HOOK(pf, NF_INET_LOCAL_OUT, skb, NULL, skb_dst(skb)->dev, |
| 525 | dst_output); |
| 526 | } else |
| 527 | ret = NF_ACCEPT; |
| 528 | return ret; |
| 529 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
| 531 | |
| 532 | /* |
| 533 | * NULL transmitter (do nothing except return NF_ACCEPT) |
| 534 | */ |
| 535 | int |
| 536 | ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 537 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | { |
| 539 | /* we do not touch skb and do not need pskb ptr */ |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 540 | return ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | } |
| 542 | |
| 543 | |
| 544 | /* |
| 545 | * Bypass transmitter |
| 546 | * Let packets bypass the destination when the destination is not |
| 547 | * available, it may be only used in transparent cache cluster. |
| 548 | */ |
| 549 | int |
| 550 | ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 551 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 553 | struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
| 555 | EnterFunction(10); |
| 556 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 557 | rcu_read_lock(); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 558 | if (__ip_vs_get_out_rt(skb, NULL, iph->daddr, IP_VS_RT_MODE_NON_LOCAL, |
| 559 | NULL) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | goto tx_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 562 | ip_send_check(iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | |
| 564 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 565 | skb->local_df = 1; |
| 566 | |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 567 | ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 0); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 568 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
| 570 | LeaveFunction(10); |
| 571 | return NF_STOLEN; |
| 572 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | tx_error: |
| 574 | kfree_skb(skb); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 575 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | LeaveFunction(10); |
| 577 | return NF_STOLEN; |
| 578 | } |
| 579 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 580 | #ifdef CONFIG_IP_VS_IPV6 |
| 581 | int |
| 582 | ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 583 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 584 | { |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 585 | EnterFunction(10); |
| 586 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 587 | rcu_read_lock(); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 588 | if (__ip_vs_get_out_rt_v6(skb, NULL, &ipvsh->daddr.in6, NULL, |
| 589 | ipvsh, 0, IP_VS_RT_MODE_NON_LOCAL) < 0) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 590 | goto tx_error; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 591 | |
| 592 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 593 | skb->local_df = 1; |
| 594 | |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 595 | ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 0); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 596 | rcu_read_unlock(); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 597 | |
| 598 | LeaveFunction(10); |
| 599 | return NF_STOLEN; |
| 600 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 601 | tx_error: |
| 602 | kfree_skb(skb); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 603 | rcu_read_unlock(); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 604 | LeaveFunction(10); |
| 605 | return NF_STOLEN; |
| 606 | } |
| 607 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
| 609 | /* |
| 610 | * NAT transmitter (only for outside-to-inside nat forwarding) |
| 611 | * Not used for related ICMP |
| 612 | */ |
| 613 | int |
| 614 | ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 615 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | { |
| 617 | struct rtable *rt; /* Route to the other host */ |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 618 | int local, rc, was_input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | |
| 620 | EnterFunction(10); |
| 621 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 622 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | /* check if it is a connection of no-client-port */ |
| 624 | if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) { |
Al Viro | 014d730 | 2006-09-28 14:29:52 -0700 | [diff] [blame] | 625 | __be16 _pt, *p; |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 626 | |
| 627 | p = skb_header_pointer(skb, ipvsh->len, sizeof(_pt), &_pt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | if (p == NULL) |
| 629 | goto tx_error; |
| 630 | ip_vs_conn_fill_cport(cp, *p); |
| 631 | IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p)); |
| 632 | } |
| 633 | |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 634 | was_input = rt_is_input_route(skb_rtable(skb)); |
| 635 | local = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
| 636 | IP_VS_RT_MODE_LOCAL | |
| 637 | IP_VS_RT_MODE_NON_LOCAL | |
| 638 | IP_VS_RT_MODE_RDR, NULL); |
| 639 | if (local < 0) |
| 640 | goto tx_error; |
| 641 | rt = skb_rtable(skb); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 642 | /* |
| 643 | * Avoid duplicate tuple in reply direction for NAT traffic |
| 644 | * to local address when connection is sync-ed |
| 645 | */ |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 646 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 647 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
| 648 | enum ip_conntrack_info ctinfo; |
Alan Cox | 05b4b06 | 2012-10-26 00:13:27 +0000 | [diff] [blame] | 649 | struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 650 | |
| 651 | if (ct && !nf_ct_is_untracked(ct)) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 652 | IP_VS_DBG_RL_PKT(10, AF_INET, pp, skb, 0, |
| 653 | "ip_vs_nat_xmit(): " |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 654 | "stopping DNAT to local address"); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 655 | goto tx_error; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 656 | } |
| 657 | } |
| 658 | #endif |
| 659 | |
| 660 | /* From world but DNAT to loopback address? */ |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 661 | if (local && ipv4_is_loopback(cp->daddr.ip) && was_input) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 662 | IP_VS_DBG_RL_PKT(1, AF_INET, pp, skb, 0, "ip_vs_nat_xmit(): " |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 663 | "stopping DNAT to loopback address"); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 664 | goto tx_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | /* copy-on-write the packet before mangling it */ |
Herbert Xu | af1e1cf | 2007-10-14 00:39:33 -0700 | [diff] [blame] | 668 | if (!skb_make_writable(skb, sizeof(struct iphdr))) |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 669 | goto tx_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 671 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 672 | goto tx_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | /* mangle the packet */ |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 675 | if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp, ipvsh)) |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 676 | goto tx_error; |
Julius Volz | e7ade46 | 2008-09-02 15:55:33 +0200 | [diff] [blame] | 677 | ip_hdr(skb)->daddr = cp->daddr.ip; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 678 | ip_send_check(ip_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 680 | IP_VS_DBG_PKT(10, AF_INET, pp, skb, 0, "After DNAT"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
| 682 | /* FIXME: when application helper enlarges the packet and the length |
| 683 | is larger than the MTU of outgoing device, there will be still |
| 684 | MTU problem. */ |
| 685 | |
| 686 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 687 | skb->local_df = 1; |
| 688 | |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 689 | rc = ip_vs_nat_send_or_cont(NFPROTO_IPV4, skb, cp, local); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 690 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
| 692 | LeaveFunction(10); |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 693 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | tx_error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | kfree_skb(skb); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 697 | rcu_read_unlock(); |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 698 | LeaveFunction(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | } |
| 701 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 702 | #ifdef CONFIG_IP_VS_IPV6 |
| 703 | int |
| 704 | ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 705 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 706 | { |
| 707 | struct rt6_info *rt; /* Route to the other host */ |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 708 | int local, rc; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 709 | |
| 710 | EnterFunction(10); |
| 711 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 712 | rcu_read_lock(); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 713 | /* check if it is a connection of no-client-port */ |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 714 | if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT && !ipvsh->fragoffs)) { |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 715 | __be16 _pt, *p; |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 716 | p = skb_header_pointer(skb, ipvsh->len, sizeof(_pt), &_pt); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 717 | if (p == NULL) |
| 718 | goto tx_error; |
| 719 | ip_vs_conn_fill_cport(cp, *p); |
| 720 | IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p)); |
| 721 | } |
| 722 | |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 723 | local = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
| 724 | ipvsh, 0, |
| 725 | IP_VS_RT_MODE_LOCAL | |
| 726 | IP_VS_RT_MODE_NON_LOCAL | |
| 727 | IP_VS_RT_MODE_RDR); |
| 728 | if (local < 0) |
| 729 | goto tx_error; |
| 730 | rt = (struct rt6_info *) skb_dst(skb); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 731 | /* |
| 732 | * Avoid duplicate tuple in reply direction for NAT traffic |
| 733 | * to local address when connection is sync-ed |
| 734 | */ |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 735 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 736 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
| 737 | enum ip_conntrack_info ctinfo; |
Alan Cox | 05b4b06 | 2012-10-26 00:13:27 +0000 | [diff] [blame] | 738 | struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 739 | |
| 740 | if (ct && !nf_ct_is_untracked(ct)) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 741 | IP_VS_DBG_RL_PKT(10, AF_INET6, pp, skb, 0, |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 742 | "ip_vs_nat_xmit_v6(): " |
| 743 | "stopping DNAT to local address"); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 744 | goto tx_error; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 745 | } |
| 746 | } |
| 747 | #endif |
| 748 | |
| 749 | /* From world but DNAT to loopback address? */ |
| 750 | if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) && |
| 751 | ipv6_addr_type(&rt->rt6i_dst.addr) & IPV6_ADDR_LOOPBACK) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 752 | IP_VS_DBG_RL_PKT(1, AF_INET6, pp, skb, 0, |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 753 | "ip_vs_nat_xmit_v6(): " |
| 754 | "stopping DNAT to loopback address"); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 755 | goto tx_error; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 756 | } |
| 757 | |
| 758 | /* copy-on-write the packet before mangling it */ |
| 759 | if (!skb_make_writable(skb, sizeof(struct ipv6hdr))) |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 760 | goto tx_error; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 761 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 762 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 763 | goto tx_error; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 764 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 765 | /* mangle the packet */ |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 766 | if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp, ipvsh)) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 767 | goto tx_error; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 768 | ipv6_hdr(skb)->daddr = cp->daddr.in6; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 769 | |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 770 | IP_VS_DBG_PKT(10, AF_INET6, pp, skb, 0, "After DNAT"); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 771 | |
| 772 | /* FIXME: when application helper enlarges the packet and the length |
| 773 | is larger than the MTU of outgoing device, there will be still |
| 774 | MTU problem. */ |
| 775 | |
| 776 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 777 | skb->local_df = 1; |
| 778 | |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 779 | rc = ip_vs_nat_send_or_cont(NFPROTO_IPV6, skb, cp, local); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 780 | rcu_read_unlock(); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 781 | |
| 782 | LeaveFunction(10); |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 783 | return rc; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 784 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 785 | tx_error: |
| 786 | LeaveFunction(10); |
| 787 | kfree_skb(skb); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 788 | rcu_read_unlock(); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 789 | return NF_STOLEN; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 790 | } |
| 791 | #endif |
| 792 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
| 794 | /* |
| 795 | * IP Tunneling transmitter |
| 796 | * |
| 797 | * This function encapsulates the packet in a new IP packet, its |
| 798 | * destination will be set to cp->daddr. Most code of this function |
| 799 | * is taken from ipip.c. |
| 800 | * |
| 801 | * It is used in VS/TUN cluster. The load balancer selects a real |
| 802 | * server from a cluster based on a scheduling algorithm, |
| 803 | * encapsulates the request packet and forwards it to the selected |
| 804 | * server. For example, all real servers are configured with |
| 805 | * "ifconfig tunl0 <Virtual IP Address> up". When the server receives |
| 806 | * the encapsulated packet, it will decapsulate the packet, processe |
| 807 | * the request and return the response packets directly to the client |
| 808 | * without passing the load balancer. This can greatly increase the |
| 809 | * scalability of virtual server. |
| 810 | * |
| 811 | * Used for ANY protocol |
| 812 | */ |
| 813 | int |
| 814 | ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 815 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | { |
Julian Anastasov | 3654e61 | 2012-07-20 11:59:53 +0300 | [diff] [blame] | 817 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | struct rtable *rt; /* Route to the other host */ |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 819 | __be32 saddr; /* Source for tunnel */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | struct net_device *tdev; /* Device to other host */ |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 821 | struct iphdr *old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | u8 tos = old_iph->tos; |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 823 | __be16 df; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | struct iphdr *iph; /* Our new IP header */ |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 825 | unsigned int max_headroom; /* The extra header space needed */ |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 826 | int ret, local; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
| 828 | EnterFunction(10); |
| 829 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 830 | rcu_read_lock(); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 831 | local = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
| 832 | IP_VS_RT_MODE_LOCAL | |
| 833 | IP_VS_RT_MODE_NON_LOCAL | |
| 834 | IP_VS_RT_MODE_CONNECT | |
| 835 | IP_VS_RT_MODE_TUNNEL, &saddr); |
| 836 | if (local < 0) |
| 837 | goto tx_error; |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 838 | if (local) { |
| 839 | rcu_read_unlock(); |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 840 | return ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 1); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 841 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 843 | rt = skb_rtable(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 844 | tdev = rt->dst.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 846 | /* Copy DF, reset fragment offset and MF */ |
Julian Anastasov | 3654e61 | 2012-07-20 11:59:53 +0300 | [diff] [blame] | 847 | df = sysctl_pmtu_disc(ipvs) ? old_iph->frag_off & htons(IP_DF) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | /* |
| 850 | * Okay, now see if we can stuff it in the buffer as-is. |
| 851 | */ |
| 852 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr); |
| 853 | |
Julian Anastasov | f11cb2c | 2013-03-21 11:58:04 +0200 | [diff] [blame] | 854 | if (skb_headroom(skb) < max_headroom || skb_cloned(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | struct sk_buff *new_skb = |
| 856 | skb_realloc_headroom(skb, max_headroom); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 857 | |
| 858 | if (!new_skb) |
| 859 | goto tx_error; |
Eric Dumazet | 5d0ba55 | 2012-06-04 01:17:19 +0000 | [diff] [blame] | 860 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | skb = new_skb; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 862 | old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | } |
| 864 | |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 865 | skb->transport_header = skb->network_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | |
| 867 | /* fix old IP header checksum */ |
| 868 | ip_send_check(old_iph); |
| 869 | |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 870 | skb_push(skb, sizeof(struct iphdr)); |
| 871 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
| 873 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | /* |
| 875 | * Push down and install the IPIP header. |
| 876 | */ |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 877 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | iph->version = 4; |
| 879 | iph->ihl = sizeof(struct iphdr)>>2; |
| 880 | iph->frag_off = df; |
| 881 | iph->protocol = IPPROTO_IPIP; |
| 882 | iph->tos = tos; |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 883 | iph->daddr = cp->daddr.ip; |
| 884 | iph->saddr = saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | iph->ttl = old_iph->ttl; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 886 | ip_select_ident(iph, &rt->dst, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | |
| 888 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 889 | skb->local_df = 1; |
| 890 | |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 891 | ret = ip_vs_tunnel_xmit_prepare(skb, cp); |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 892 | if (ret == NF_ACCEPT) |
| 893 | ip_local_out(skb); |
| 894 | else if (ret == NF_DROP) |
| 895 | kfree_skb(skb); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 896 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | |
| 898 | LeaveFunction(10); |
| 899 | |
| 900 | return NF_STOLEN; |
| 901 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | tx_error: |
| 903 | kfree_skb(skb); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 904 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | LeaveFunction(10); |
| 906 | return NF_STOLEN; |
| 907 | } |
| 908 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 909 | #ifdef CONFIG_IP_VS_IPV6 |
| 910 | int |
| 911 | ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 912 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 913 | { |
| 914 | struct rt6_info *rt; /* Route to the other host */ |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 915 | struct in6_addr saddr; /* Source for tunnel */ |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 916 | struct net_device *tdev; /* Device to other host */ |
| 917 | struct ipv6hdr *old_iph = ipv6_hdr(skb); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 918 | struct ipv6hdr *iph; /* Our new IP header */ |
| 919 | unsigned int max_headroom; /* The extra header space needed */ |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 920 | int ret, local; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 921 | |
| 922 | EnterFunction(10); |
| 923 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 924 | rcu_read_lock(); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 925 | local = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, |
| 926 | &saddr, ipvsh, 1, |
| 927 | IP_VS_RT_MODE_LOCAL | |
| 928 | IP_VS_RT_MODE_NON_LOCAL | |
| 929 | IP_VS_RT_MODE_TUNNEL); |
| 930 | if (local < 0) |
| 931 | goto tx_error; |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 932 | if (local) { |
| 933 | rcu_read_unlock(); |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 934 | return ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 1); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 935 | } |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 936 | |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 937 | rt = (struct rt6_info *) skb_dst(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 938 | tdev = rt->dst.dev; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 939 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 940 | /* |
| 941 | * Okay, now see if we can stuff it in the buffer as-is. |
| 942 | */ |
| 943 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct ipv6hdr); |
| 944 | |
Julian Anastasov | f11cb2c | 2013-03-21 11:58:04 +0200 | [diff] [blame] | 945 | if (skb_headroom(skb) < max_headroom || skb_cloned(skb)) { |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 946 | struct sk_buff *new_skb = |
| 947 | skb_realloc_headroom(skb, max_headroom); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 948 | |
| 949 | if (!new_skb) |
| 950 | goto tx_error; |
Eric Dumazet | 5d0ba55 | 2012-06-04 01:17:19 +0000 | [diff] [blame] | 951 | consume_skb(skb); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 952 | skb = new_skb; |
| 953 | old_iph = ipv6_hdr(skb); |
| 954 | } |
| 955 | |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 956 | skb->transport_header = skb->network_header; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 957 | |
| 958 | skb_push(skb, sizeof(struct ipv6hdr)); |
| 959 | skb_reset_network_header(skb); |
| 960 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
| 961 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 962 | /* |
| 963 | * Push down and install the IPIP header. |
| 964 | */ |
| 965 | iph = ipv6_hdr(skb); |
| 966 | iph->version = 6; |
| 967 | iph->nexthdr = IPPROTO_IPV6; |
Harvey Harrison | b7b45f4 | 2008-11-10 16:46:06 -0800 | [diff] [blame] | 968 | iph->payload_len = old_iph->payload_len; |
| 969 | be16_add_cpu(&iph->payload_len, sizeof(*old_iph)); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 970 | iph->priority = old_iph->priority; |
| 971 | memset(&iph->flow_lbl, 0, sizeof(iph->flow_lbl)); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 972 | iph->daddr = cp->daddr.in6; |
| 973 | iph->saddr = saddr; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 974 | iph->hop_limit = old_iph->hop_limit; |
| 975 | |
| 976 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 977 | skb->local_df = 1; |
| 978 | |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 979 | ret = ip_vs_tunnel_xmit_prepare(skb, cp); |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 980 | if (ret == NF_ACCEPT) |
| 981 | ip6_local_out(skb); |
| 982 | else if (ret == NF_DROP) |
| 983 | kfree_skb(skb); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 984 | rcu_read_unlock(); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 985 | |
| 986 | LeaveFunction(10); |
| 987 | |
| 988 | return NF_STOLEN; |
| 989 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 990 | tx_error: |
| 991 | kfree_skb(skb); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 992 | rcu_read_unlock(); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 993 | LeaveFunction(10); |
| 994 | return NF_STOLEN; |
| 995 | } |
| 996 | #endif |
| 997 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | |
| 999 | /* |
| 1000 | * Direct Routing transmitter |
| 1001 | * Used for ANY protocol |
| 1002 | */ |
| 1003 | int |
| 1004 | ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1005 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | { |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1007 | int local; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | |
| 1009 | EnterFunction(10); |
| 1010 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1011 | rcu_read_lock(); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1012 | local = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
| 1013 | IP_VS_RT_MODE_LOCAL | |
| 1014 | IP_VS_RT_MODE_NON_LOCAL | |
| 1015 | IP_VS_RT_MODE_KNOWN_NH, NULL); |
| 1016 | if (local < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | goto tx_error; |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1018 | if (local) { |
| 1019 | rcu_read_unlock(); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1020 | return ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 1); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1021 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1023 | ip_send_check(ip_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 1026 | skb->local_df = 1; |
| 1027 | |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 1028 | ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 0); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1029 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | |
| 1031 | LeaveFunction(10); |
| 1032 | return NF_STOLEN; |
| 1033 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | tx_error: |
| 1035 | kfree_skb(skb); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1036 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | LeaveFunction(10); |
| 1038 | return NF_STOLEN; |
| 1039 | } |
| 1040 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1041 | #ifdef CONFIG_IP_VS_IPV6 |
| 1042 | int |
| 1043 | ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1044 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1045 | { |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1046 | int local; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1047 | |
| 1048 | EnterFunction(10); |
| 1049 | |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1050 | rcu_read_lock(); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1051 | local = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
| 1052 | ipvsh, 0, |
| 1053 | IP_VS_RT_MODE_LOCAL | |
| 1054 | IP_VS_RT_MODE_NON_LOCAL); |
| 1055 | if (local < 0) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1056 | goto tx_error; |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1057 | if (local) { |
| 1058 | rcu_read_unlock(); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1059 | return ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 1); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1060 | } |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1061 | |
| 1062 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 1063 | skb->local_df = 1; |
| 1064 | |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 1065 | ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 0); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1066 | rcu_read_unlock(); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1067 | |
| 1068 | LeaveFunction(10); |
| 1069 | return NF_STOLEN; |
| 1070 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1071 | tx_error: |
| 1072 | kfree_skb(skb); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1073 | rcu_read_unlock(); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1074 | LeaveFunction(10); |
| 1075 | return NF_STOLEN; |
| 1076 | } |
| 1077 | #endif |
| 1078 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | |
| 1080 | /* |
| 1081 | * ICMP packet transmitter |
| 1082 | * called by the ip_vs_in_icmp |
| 1083 | */ |
| 1084 | int |
| 1085 | ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1086 | struct ip_vs_protocol *pp, int offset, unsigned int hooknum, |
| 1087 | struct ip_vs_iphdr *iph) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | { |
| 1089 | struct rtable *rt; /* Route to the other host */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | int rc; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1091 | int local; |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1092 | int rt_mode, was_input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | |
| 1094 | EnterFunction(10); |
| 1095 | |
| 1096 | /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be |
| 1097 | forwarded directly here, because there is no need to |
| 1098 | translate address/port back */ |
| 1099 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) { |
| 1100 | if (cp->packet_xmit) |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1101 | rc = cp->packet_xmit(skb, cp, pp, iph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | else |
| 1103 | rc = NF_ACCEPT; |
| 1104 | /* do not touch skb anymore */ |
| 1105 | atomic_inc(&cp->in_pkts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | goto out; |
| 1107 | } |
| 1108 | |
| 1109 | /* |
| 1110 | * mangle and send the packet here (only for VS/NAT) |
| 1111 | */ |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1112 | was_input = rt_is_input_route(skb_rtable(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 1114 | /* LOCALNODE from FORWARD hook is not supported */ |
| 1115 | rt_mode = (hooknum != NF_INET_FORWARD) ? |
| 1116 | IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL | |
| 1117 | IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL; |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1118 | rcu_read_lock(); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1119 | local = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, rt_mode, NULL); |
| 1120 | if (local < 0) |
| 1121 | goto tx_error; |
| 1122 | rt = skb_rtable(skb); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1123 | |
| 1124 | /* |
| 1125 | * Avoid duplicate tuple in reply direction for NAT traffic |
| 1126 | * to local address when connection is sync-ed |
| 1127 | */ |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 1128 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1129 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
| 1130 | enum ip_conntrack_info ctinfo; |
Alan Cox | 05b4b06 | 2012-10-26 00:13:27 +0000 | [diff] [blame] | 1131 | struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1132 | |
| 1133 | if (ct && !nf_ct_is_untracked(ct)) { |
| 1134 | IP_VS_DBG(10, "%s(): " |
| 1135 | "stopping DNAT to local address %pI4\n", |
| 1136 | __func__, &cp->daddr.ip); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1137 | goto tx_error; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1138 | } |
| 1139 | } |
| 1140 | #endif |
| 1141 | |
| 1142 | /* From world but DNAT to loopback address? */ |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1143 | if (local && ipv4_is_loopback(cp->daddr.ip) && was_input) { |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1144 | IP_VS_DBG(1, "%s(): " |
| 1145 | "stopping DNAT to loopback %pI4\n", |
| 1146 | __func__, &cp->daddr.ip); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1147 | goto tx_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | } |
| 1149 | |
| 1150 | /* copy-on-write the packet before mangling it */ |
Herbert Xu | af1e1cf | 2007-10-14 00:39:33 -0700 | [diff] [blame] | 1151 | if (!skb_make_writable(skb, offset)) |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1152 | goto tx_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1154 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1155 | goto tx_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | ip_vs_nat_icmp(skb, pp, cp, 0); |
| 1158 | |
| 1159 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 1160 | skb->local_df = 1; |
| 1161 | |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 1162 | rc = ip_vs_nat_send_or_cont(NFPROTO_IPV4, skb, cp, local); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1163 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | goto out; |
| 1165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | tx_error: |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1167 | kfree_skb(skb); |
| 1168 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | rc = NF_STOLEN; |
| 1170 | out: |
| 1171 | LeaveFunction(10); |
| 1172 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | } |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1174 | |
| 1175 | #ifdef CONFIG_IP_VS_IPV6 |
| 1176 | int |
| 1177 | ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, |
Jesper Dangaard Brouer | d4383f0 | 2012-09-26 14:07:17 +0200 | [diff] [blame] | 1178 | struct ip_vs_protocol *pp, int offset, unsigned int hooknum, |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1179 | struct ip_vs_iphdr *ipvsh) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1180 | { |
| 1181 | struct rt6_info *rt; /* Route to the other host */ |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1182 | int rc; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1183 | int local; |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 1184 | int rt_mode; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1185 | |
| 1186 | EnterFunction(10); |
| 1187 | |
| 1188 | /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be |
| 1189 | forwarded directly here, because there is no need to |
| 1190 | translate address/port back */ |
| 1191 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) { |
| 1192 | if (cp->packet_xmit) |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1193 | rc = cp->packet_xmit(skb, cp, pp, ipvsh); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1194 | else |
| 1195 | rc = NF_ACCEPT; |
| 1196 | /* do not touch skb anymore */ |
| 1197 | atomic_inc(&cp->in_pkts); |
| 1198 | goto out; |
| 1199 | } |
| 1200 | |
| 1201 | /* |
| 1202 | * mangle and send the packet here (only for VS/NAT) |
| 1203 | */ |
| 1204 | |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 1205 | /* LOCALNODE from FORWARD hook is not supported */ |
| 1206 | rt_mode = (hooknum != NF_INET_FORWARD) ? |
| 1207 | IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL | |
| 1208 | IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL; |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1209 | rcu_read_lock(); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1210 | local = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
| 1211 | ipvsh, 0, rt_mode); |
| 1212 | if (local < 0) |
| 1213 | goto tx_error; |
| 1214 | rt = (struct rt6_info *) skb_dst(skb); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1215 | /* |
| 1216 | * Avoid duplicate tuple in reply direction for NAT traffic |
| 1217 | * to local address when connection is sync-ed |
| 1218 | */ |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 1219 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1220 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
| 1221 | enum ip_conntrack_info ctinfo; |
Alan Cox | 05b4b06 | 2012-10-26 00:13:27 +0000 | [diff] [blame] | 1222 | struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1223 | |
| 1224 | if (ct && !nf_ct_is_untracked(ct)) { |
| 1225 | IP_VS_DBG(10, "%s(): " |
| 1226 | "stopping DNAT to local address %pI6\n", |
| 1227 | __func__, &cp->daddr.in6); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1228 | goto tx_error; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1229 | } |
| 1230 | } |
| 1231 | #endif |
| 1232 | |
| 1233 | /* From world but DNAT to loopback address? */ |
| 1234 | if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) && |
| 1235 | ipv6_addr_type(&rt->rt6i_dst.addr) & IPV6_ADDR_LOOPBACK) { |
| 1236 | IP_VS_DBG(1, "%s(): " |
| 1237 | "stopping DNAT to loopback %pI6\n", |
| 1238 | __func__, &cp->daddr.in6); |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1239 | goto tx_error; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1240 | } |
| 1241 | |
| 1242 | /* copy-on-write the packet before mangling it */ |
| 1243 | if (!skb_make_writable(skb, offset)) |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1244 | goto tx_error; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1245 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1246 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
Julian Anastasov | 4115ded | 2013-03-21 11:58:05 +0200 | [diff] [blame] | 1247 | goto tx_error; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1248 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1249 | ip_vs_nat_icmp_v6(skb, pp, cp, 0); |
| 1250 | |
| 1251 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 1252 | skb->local_df = 1; |
| 1253 | |
Julian Anastasov | b8abdf0 | 2013-03-21 11:58:01 +0200 | [diff] [blame] | 1254 | rc = ip_vs_nat_send_or_cont(NFPROTO_IPV6, skb, cp, local); |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1255 | rcu_read_unlock(); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1256 | goto out; |
| 1257 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1258 | tx_error: |
Julian Anastasov | 026ace0 | 2013-03-21 11:58:06 +0200 | [diff] [blame] | 1259 | kfree_skb(skb); |
| 1260 | rcu_read_unlock(); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1261 | rc = NF_STOLEN; |
| 1262 | out: |
| 1263 | LeaveFunction(10); |
| 1264 | return rc; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1265 | } |
| 1266 | #endif |