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 |
| 20 | * LOCAL_OUT rules: |
| 21 | * - skb->dev is NULL, skb->protocol is not set (both are set in POST_ROUTING) |
| 22 | * - skb->pkt_type is not set yet |
| 23 | * - the only place where we can see skb->sk != NULL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | */ |
| 25 | |
Hannes Eder | 9aada7a | 2009-07-30 14:29:44 -0700 | [diff] [blame] | 26 | #define KMSG_COMPONENT "IPVS" |
| 27 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 30 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/tcp.h> /* for tcphdr */ |
Herbert Xu | c439cb2 | 2008-01-11 19:14:00 -0800 | [diff] [blame] | 32 | #include <net/ip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <net/tcp.h> /* for csum_tcpudp_magic */ |
| 34 | #include <net/udp.h> |
| 35 | #include <net/icmp.h> /* for icmp_send */ |
| 36 | #include <net/route.h> /* for ip_route_output */ |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 37 | #include <net/ipv6.h> |
| 38 | #include <net/ip6_route.h> |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 39 | #include <net/addrconf.h> |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 40 | #include <linux/icmpv6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <linux/netfilter.h> |
| 42 | #include <linux/netfilter_ipv4.h> |
| 43 | |
| 44 | #include <net/ip_vs.h> |
| 45 | |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 46 | enum { |
| 47 | IP_VS_RT_MODE_LOCAL = 1, /* Allow local dest */ |
| 48 | IP_VS_RT_MODE_NON_LOCAL = 2, /* Allow non-local dest */ |
| 49 | IP_VS_RT_MODE_RDR = 4, /* Allow redirect from remote daddr to |
| 50 | * local |
| 51 | */ |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 52 | IP_VS_RT_MODE_CONNECT = 8, /* Always bind route to saddr */ |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 53 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | /* |
| 56 | * Destination cache to speed up outgoing route lookup |
| 57 | */ |
| 58 | static inline void |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 59 | __ip_vs_dst_set(struct ip_vs_dest *dest, u32 rtos, struct dst_entry *dst, |
| 60 | u32 dst_cookie) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | { |
| 62 | struct dst_entry *old_dst; |
| 63 | |
| 64 | old_dst = dest->dst_cache; |
| 65 | dest->dst_cache = dst; |
| 66 | dest->dst_rtos = rtos; |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 67 | dest->dst_cookie = dst_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | dst_release(old_dst); |
| 69 | } |
| 70 | |
| 71 | static inline struct dst_entry * |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 72 | __ip_vs_dst_check(struct ip_vs_dest *dest, u32 rtos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | { |
| 74 | struct dst_entry *dst = dest->dst_cache; |
| 75 | |
| 76 | if (!dst) |
| 77 | return NULL; |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 78 | if ((dst->obsolete || rtos != dest->dst_rtos) && |
| 79 | dst->ops->check(dst, dest->dst_cookie) == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | dest->dst_cache = NULL; |
| 81 | dst_release(dst); |
| 82 | return NULL; |
| 83 | } |
| 84 | dst_hold(dst); |
| 85 | return dst; |
| 86 | } |
| 87 | |
Jesper Dangaard Brouer | 590e3f7 | 2012-08-28 22:05:51 +0200 | [diff] [blame] | 88 | static inline bool |
| 89 | __mtu_check_toobig_v6(const struct sk_buff *skb, u32 mtu) |
| 90 | { |
Patrick McHardy | 4cdd3408 | 2012-08-26 19:13:58 +0200 | [diff] [blame] | 91 | if (IP6CB(skb)->frag_max_size) { |
| 92 | /* frag_max_size tell us that, this packet have been |
| 93 | * defragmented by netfilter IPv6 conntrack module. |
| 94 | */ |
| 95 | if (IP6CB(skb)->frag_max_size > mtu) |
| 96 | return true; /* largest fragment violate MTU */ |
| 97 | } |
| 98 | else if (skb->len > mtu && !skb_is_gso(skb)) { |
Jesper Dangaard Brouer | 590e3f7 | 2012-08-28 22:05:51 +0200 | [diff] [blame] | 99 | return true; /* Packet size violate MTU size */ |
| 100 | } |
| 101 | return false; |
| 102 | } |
| 103 | |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 104 | /* Get route to daddr, update *saddr, optionally bind route to saddr */ |
| 105 | static struct rtable *do_output_route4(struct net *net, __be32 daddr, |
| 106 | u32 rtos, int rt_mode, __be32 *saddr) |
| 107 | { |
| 108 | struct flowi4 fl4; |
| 109 | struct rtable *rt; |
| 110 | int loop = 0; |
| 111 | |
| 112 | memset(&fl4, 0, sizeof(fl4)); |
| 113 | fl4.daddr = daddr; |
| 114 | fl4.saddr = (rt_mode & IP_VS_RT_MODE_CONNECT) ? *saddr : 0; |
| 115 | fl4.flowi4_tos = rtos; |
| 116 | |
| 117 | retry: |
| 118 | rt = ip_route_output_key(net, &fl4); |
| 119 | if (IS_ERR(rt)) { |
| 120 | /* Invalid saddr ? */ |
| 121 | if (PTR_ERR(rt) == -EINVAL && *saddr && |
| 122 | rt_mode & IP_VS_RT_MODE_CONNECT && !loop) { |
| 123 | *saddr = 0; |
| 124 | flowi4_update_output(&fl4, 0, rtos, daddr, 0); |
| 125 | goto retry; |
| 126 | } |
| 127 | IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n", &daddr); |
| 128 | return NULL; |
| 129 | } else if (!*saddr && rt_mode & IP_VS_RT_MODE_CONNECT && fl4.saddr) { |
| 130 | ip_rt_put(rt); |
| 131 | *saddr = fl4.saddr; |
| 132 | flowi4_update_output(&fl4, 0, rtos, daddr, fl4.saddr); |
| 133 | loop++; |
| 134 | goto retry; |
| 135 | } |
| 136 | *saddr = fl4.saddr; |
| 137 | return rt; |
| 138 | } |
| 139 | |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 140 | /* Get route to destination or remote server */ |
Ilpo Järvinen | ad1b30b | 2008-01-05 23:12:40 -0800 | [diff] [blame] | 141 | static struct rtable * |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 142 | __ip_vs_get_out_rt(struct sk_buff *skb, struct ip_vs_dest *dest, |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 143 | __be32 daddr, u32 rtos, int rt_mode, __be32 *ret_saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | { |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 145 | struct net *net = dev_net(skb_dst(skb)->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | struct rtable *rt; /* Route to the other host */ |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 147 | struct rtable *ort; /* Original route */ |
| 148 | int local; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | if (dest) { |
| 151 | spin_lock(&dest->dst_lock); |
| 152 | if (!(rt = (struct rtable *) |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 153 | __ip_vs_dst_check(dest, rtos))) { |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 154 | rt = do_output_route4(net, dest->addr.ip, rtos, |
| 155 | rt_mode, &dest->dst_saddr.ip); |
| 156 | if (!rt) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | spin_unlock(&dest->dst_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | return NULL; |
| 159 | } |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 160 | __ip_vs_dst_set(dest, rtos, dst_clone(&rt->dst), 0); |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 161 | IP_VS_DBG(10, "new dst %pI4, src %pI4, refcnt=%d, " |
| 162 | "rtos=%X\n", |
| 163 | &dest->addr.ip, &dest->dst_saddr.ip, |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 164 | atomic_read(&rt->dst.__refcnt), rtos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | } |
David S. Miller | 44e3125 | 2011-05-09 14:38:06 -0700 | [diff] [blame] | 166 | daddr = dest->addr.ip; |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 167 | if (ret_saddr) |
| 168 | *ret_saddr = dest->dst_saddr.ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | spin_unlock(&dest->dst_lock); |
| 170 | } else { |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 171 | __be32 saddr = htonl(INADDR_ANY); |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 172 | |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 173 | /* For such unconfigured boxes avoid many route lookups |
| 174 | * for performance reasons because we do not remember saddr |
| 175 | */ |
| 176 | rt_mode &= ~IP_VS_RT_MODE_CONNECT; |
| 177 | rt = do_output_route4(net, daddr, rtos, rt_mode, &saddr); |
| 178 | if (!rt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | return NULL; |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 180 | if (ret_saddr) |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 181 | *ret_saddr = saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
| 183 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 184 | local = rt->rt_flags & RTCF_LOCAL; |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 185 | if (!((local ? IP_VS_RT_MODE_LOCAL : IP_VS_RT_MODE_NON_LOCAL) & |
| 186 | rt_mode)) { |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 187 | IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI4\n", |
| 188 | (rt->rt_flags & RTCF_LOCAL) ? |
David S. Miller | 44e3125 | 2011-05-09 14:38:06 -0700 | [diff] [blame] | 189 | "local":"non-local", &daddr); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 190 | ip_rt_put(rt); |
| 191 | return NULL; |
| 192 | } |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 193 | if (local && !(rt_mode & IP_VS_RT_MODE_RDR) && |
| 194 | !((ort = skb_rtable(skb)) && ort->rt_flags & RTCF_LOCAL)) { |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 195 | IP_VS_DBG_RL("Redirect from non-local address %pI4 to local " |
| 196 | "requires NAT method, dest: %pI4\n", |
David S. Miller | 44e3125 | 2011-05-09 14:38:06 -0700 | [diff] [blame] | 197 | &ip_hdr(skb)->daddr, &daddr); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 198 | ip_rt_put(rt); |
| 199 | return NULL; |
| 200 | } |
| 201 | if (unlikely(!local && ipv4_is_loopback(ip_hdr(skb)->saddr))) { |
| 202 | IP_VS_DBG_RL("Stopping traffic from loopback address %pI4 " |
| 203 | "to non-local address, dest: %pI4\n", |
David S. Miller | 44e3125 | 2011-05-09 14:38:06 -0700 | [diff] [blame] | 204 | &ip_hdr(skb)->saddr, &daddr); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 205 | ip_rt_put(rt); |
| 206 | return NULL; |
| 207 | } |
| 208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | return rt; |
| 210 | } |
| 211 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 212 | /* Reroute packet to local IPv4 stack after DNAT */ |
| 213 | static int |
| 214 | __ip_vs_reroute_locally(struct sk_buff *skb) |
| 215 | { |
| 216 | struct rtable *rt = skb_rtable(skb); |
| 217 | struct net_device *dev = rt->dst.dev; |
| 218 | struct net *net = dev_net(dev); |
| 219 | struct iphdr *iph = ip_hdr(skb); |
| 220 | |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 221 | if (rt_is_input_route(rt)) { |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 222 | unsigned long orefdst = skb->_skb_refdst; |
| 223 | |
| 224 | if (ip_route_input(skb, iph->daddr, iph->saddr, |
| 225 | iph->tos, skb->dev)) |
| 226 | return 0; |
| 227 | refdst_drop(orefdst); |
| 228 | } else { |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 229 | struct flowi4 fl4 = { |
| 230 | .daddr = iph->daddr, |
| 231 | .saddr = iph->saddr, |
| 232 | .flowi4_tos = RT_TOS(iph->tos), |
| 233 | .flowi4_mark = skb->mark, |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 234 | }; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 235 | |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 236 | rt = ip_route_output_key(net, &fl4); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 237 | if (IS_ERR(rt)) |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 238 | return 0; |
| 239 | if (!(rt->rt_flags & RTCF_LOCAL)) { |
| 240 | ip_rt_put(rt); |
| 241 | return 0; |
| 242 | } |
| 243 | /* Drop old route. */ |
| 244 | skb_dst_drop(skb); |
| 245 | skb_dst_set(skb, &rt->dst); |
| 246 | } |
| 247 | return 1; |
| 248 | } |
| 249 | |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 250 | #ifdef CONFIG_IP_VS_IPV6 |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 251 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 252 | static inline int __ip_vs_is_local_route6(struct rt6_info *rt) |
| 253 | { |
David S. Miller | d191854 | 2011-12-28 20:19:20 -0500 | [diff] [blame] | 254 | return rt->dst.dev && rt->dst.dev->flags & IFF_LOOPBACK; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 255 | } |
| 256 | |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 257 | static struct dst_entry * |
| 258 | __ip_vs_route_output_v6(struct net *net, struct in6_addr *daddr, |
| 259 | struct in6_addr *ret_saddr, int do_xfrm) |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 260 | { |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 261 | struct dst_entry *dst; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 262 | struct flowi6 fl6 = { |
| 263 | .daddr = *daddr, |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 264 | }; |
| 265 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 266 | dst = ip6_route_output(net, NULL, &fl6); |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 267 | if (dst->error) |
| 268 | goto out_err; |
| 269 | if (!ret_saddr) |
| 270 | return dst; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 271 | if (ipv6_addr_any(&fl6.saddr) && |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 272 | ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 273 | &fl6.daddr, 0, &fl6.saddr) < 0) |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 274 | goto out_err; |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 275 | if (do_xfrm) { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 276 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 277 | if (IS_ERR(dst)) { |
| 278 | dst = NULL; |
| 279 | goto out_err; |
| 280 | } |
| 281 | } |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 282 | *ret_saddr = fl6.saddr; |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 283 | return dst; |
| 284 | |
| 285 | out_err: |
| 286 | dst_release(dst); |
| 287 | IP_VS_DBG_RL("ip6_route_output error, dest: %pI6\n", daddr); |
| 288 | return NULL; |
| 289 | } |
| 290 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 291 | /* |
| 292 | * Get route to destination or remote server |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 293 | */ |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 294 | static struct rt6_info * |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 295 | __ip_vs_get_out_rt_v6(struct sk_buff *skb, struct ip_vs_dest *dest, |
| 296 | struct in6_addr *daddr, struct in6_addr *ret_saddr, |
| 297 | int do_xfrm, int rt_mode) |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 298 | { |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 299 | struct net *net = dev_net(skb_dst(skb)->dev); |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 300 | struct rt6_info *rt; /* Route to the other host */ |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 301 | struct rt6_info *ort; /* Original route */ |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 302 | struct dst_entry *dst; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 303 | int local; |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 304 | |
| 305 | if (dest) { |
| 306 | spin_lock(&dest->dst_lock); |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 307 | rt = (struct rt6_info *)__ip_vs_dst_check(dest, 0); |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 308 | if (!rt) { |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 309 | u32 cookie; |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 310 | |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 311 | dst = __ip_vs_route_output_v6(net, &dest->addr.in6, |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 312 | &dest->dst_saddr.in6, |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 313 | do_xfrm); |
| 314 | if (!dst) { |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 315 | spin_unlock(&dest->dst_lock); |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 316 | return NULL; |
| 317 | } |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 318 | rt = (struct rt6_info *) dst; |
| 319 | cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; |
| 320 | __ip_vs_dst_set(dest, 0, dst_clone(&rt->dst), cookie); |
| 321 | IP_VS_DBG(10, "new dst %pI6, src %pI6, refcnt=%d\n", |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 322 | &dest->addr.in6, &dest->dst_saddr.in6, |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 323 | atomic_read(&rt->dst.__refcnt)); |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 324 | } |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 325 | if (ret_saddr) |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 326 | *ret_saddr = dest->dst_saddr.in6; |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 327 | spin_unlock(&dest->dst_lock); |
| 328 | } else { |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 329 | dst = __ip_vs_route_output_v6(net, daddr, ret_saddr, do_xfrm); |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 330 | if (!dst) |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 331 | return NULL; |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 332 | rt = (struct rt6_info *) dst; |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 333 | } |
| 334 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 335 | local = __ip_vs_is_local_route6(rt); |
David S. Miller | e58b344 | 2011-05-12 18:22:34 -0400 | [diff] [blame] | 336 | if (!((local ? IP_VS_RT_MODE_LOCAL : IP_VS_RT_MODE_NON_LOCAL) & |
| 337 | rt_mode)) { |
Jesper Dangaard Brouer | 120b9c1 | 2012-09-26 14:05:53 +0200 | [diff] [blame^] | 338 | IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI6c\n", |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 339 | local ? "local":"non-local", daddr); |
| 340 | dst_release(&rt->dst); |
| 341 | return NULL; |
| 342 | } |
David S. Miller | e58b344 | 2011-05-12 18:22:34 -0400 | [diff] [blame] | 343 | if (local && !(rt_mode & IP_VS_RT_MODE_RDR) && |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 344 | !((ort = (struct rt6_info *) skb_dst(skb)) && |
| 345 | __ip_vs_is_local_route6(ort))) { |
Jesper Dangaard Brouer | 120b9c1 | 2012-09-26 14:05:53 +0200 | [diff] [blame^] | 346 | IP_VS_DBG_RL("Redirect from non-local address %pI6c to local " |
| 347 | "requires NAT method, dest: %pI6c\n", |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 348 | &ipv6_hdr(skb)->daddr, daddr); |
| 349 | dst_release(&rt->dst); |
| 350 | return NULL; |
| 351 | } |
| 352 | if (unlikely(!local && (!skb->dev || skb->dev->flags & IFF_LOOPBACK) && |
| 353 | ipv6_addr_type(&ipv6_hdr(skb)->saddr) & |
| 354 | IPV6_ADDR_LOOPBACK)) { |
Jesper Dangaard Brouer | 120b9c1 | 2012-09-26 14:05:53 +0200 | [diff] [blame^] | 355 | IP_VS_DBG_RL("Stopping traffic from loopback address %pI6c " |
| 356 | "to non-local address, dest: %pI6c\n", |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 357 | &ipv6_hdr(skb)->saddr, daddr); |
| 358 | dst_release(&rt->dst); |
| 359 | return NULL; |
| 360 | } |
| 361 | |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 362 | return rt; |
| 363 | } |
| 364 | #endif |
| 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
| 367 | /* |
| 368 | * Release dest->dst_cache before a dest is removed |
| 369 | */ |
| 370 | void |
| 371 | ip_vs_dst_reset(struct ip_vs_dest *dest) |
| 372 | { |
| 373 | struct dst_entry *old_dst; |
| 374 | |
| 375 | old_dst = dest->dst_cache; |
| 376 | dest->dst_cache = NULL; |
| 377 | dst_release(old_dst); |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 378 | dest->dst_saddr.ip = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | } |
| 380 | |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 381 | #define IP_VS_XMIT_TUNNEL(skb, cp) \ |
| 382 | ({ \ |
| 383 | int __ret = NF_ACCEPT; \ |
| 384 | \ |
Julian Anastasov | cf356d6 | 2010-10-17 16:21:07 +0300 | [diff] [blame] | 385 | (skb)->ipvs_property = 1; \ |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 386 | if (unlikely((cp)->flags & IP_VS_CONN_F_NFCT)) \ |
Simon Horman | 3c2de2a | 2011-09-16 14:02:19 +0900 | [diff] [blame] | 387 | __ret = ip_vs_confirm_conntrack(skb); \ |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 388 | if (__ret == NF_ACCEPT) { \ |
| 389 | nf_reset(skb); \ |
Julian Anastasov | 4256f1a | 2010-10-17 16:29:40 +0300 | [diff] [blame] | 390 | skb_forward_csum(skb); \ |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 391 | } \ |
| 392 | __ret; \ |
| 393 | }) |
| 394 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 395 | #define IP_VS_XMIT_NAT(pf, skb, cp, local) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | do { \ |
Julian Anastasov | cf356d6 | 2010-10-17 16:21:07 +0300 | [diff] [blame] | 397 | (skb)->ipvs_property = 1; \ |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 398 | if (likely(!((cp)->flags & IP_VS_CONN_F_NFCT))) \ |
Julian Anastasov | cf356d6 | 2010-10-17 16:21:07 +0300 | [diff] [blame] | 399 | ip_vs_notrack(skb); \ |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 400 | else \ |
| 401 | ip_vs_update_conntrack(skb, cp, 1); \ |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 402 | if (local) \ |
| 403 | return NF_ACCEPT; \ |
Herbert Xu | ccc7911 | 2007-07-30 16:20:12 -0700 | [diff] [blame] | 404 | skb_forward_csum(skb); \ |
Julius Volz | 38cdcc9 | 2008-09-02 15:55:44 +0200 | [diff] [blame] | 405 | NF_HOOK(pf, NF_INET_LOCAL_OUT, (skb), NULL, \ |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 406 | skb_dst(skb)->dev, dst_output); \ |
| 407 | } while (0) |
| 408 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 409 | #define IP_VS_XMIT(pf, skb, cp, local) \ |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 410 | do { \ |
Julian Anastasov | cf356d6 | 2010-10-17 16:21:07 +0300 | [diff] [blame] | 411 | (skb)->ipvs_property = 1; \ |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 412 | if (likely(!((cp)->flags & IP_VS_CONN_F_NFCT))) \ |
Julian Anastasov | cf356d6 | 2010-10-17 16:21:07 +0300 | [diff] [blame] | 413 | ip_vs_notrack(skb); \ |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 414 | if (local) \ |
| 415 | return NF_ACCEPT; \ |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 416 | skb_forward_csum(skb); \ |
| 417 | NF_HOOK(pf, NF_INET_LOCAL_OUT, (skb), NULL, \ |
| 418 | skb_dst(skb)->dev, dst_output); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | } while (0) |
| 420 | |
| 421 | |
| 422 | /* |
| 423 | * NULL transmitter (do nothing except return NF_ACCEPT) |
| 424 | */ |
| 425 | int |
| 426 | ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, |
| 427 | struct ip_vs_protocol *pp) |
| 428 | { |
| 429 | /* we do not touch skb and do not need pskb ptr */ |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 430 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | } |
| 432 | |
| 433 | |
| 434 | /* |
| 435 | * Bypass transmitter |
| 436 | * Let packets bypass the destination when the destination is not |
| 437 | * available, it may be only used in transparent cache cluster. |
| 438 | */ |
| 439 | int |
| 440 | ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, |
| 441 | struct ip_vs_protocol *pp) |
| 442 | { |
| 443 | struct rtable *rt; /* Route to the other host */ |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 444 | struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | int mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
| 447 | EnterFunction(10); |
| 448 | |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 449 | if (!(rt = __ip_vs_get_out_rt(skb, NULL, iph->daddr, RT_TOS(iph->tos), |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 450 | IP_VS_RT_MODE_NON_LOCAL, NULL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | goto tx_error_icmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | |
| 453 | /* MTU checking */ |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 454 | mtu = dst_mtu(&rt->dst); |
Simon Horman | 8f1b03a | 2010-11-09 10:08:49 +0900 | [diff] [blame] | 455 | if ((skb->len > mtu) && (iph->frag_off & htons(IP_DF)) && |
| 456 | !skb_is_gso(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | ip_rt_put(rt); |
| 458 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 459 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | goto tx_error; |
| 461 | } |
| 462 | |
| 463 | /* |
| 464 | * Call ip_send_check because we are not sure it is called |
| 465 | * after ip_defrag. Is copy-on-write needed? |
| 466 | */ |
| 467 | if (unlikely((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)) { |
| 468 | ip_rt_put(rt); |
| 469 | return NF_STOLEN; |
| 470 | } |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 471 | ip_send_check(ip_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
| 473 | /* drop old route */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 474 | skb_dst_drop(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 475 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | |
| 477 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 478 | skb->local_df = 1; |
| 479 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 480 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
| 482 | LeaveFunction(10); |
| 483 | return NF_STOLEN; |
| 484 | |
| 485 | tx_error_icmp: |
| 486 | dst_link_failure(skb); |
| 487 | tx_error: |
| 488 | kfree_skb(skb); |
| 489 | LeaveFunction(10); |
| 490 | return NF_STOLEN; |
| 491 | } |
| 492 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 493 | #ifdef CONFIG_IP_VS_IPV6 |
| 494 | int |
| 495 | ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, |
| 496 | struct ip_vs_protocol *pp) |
| 497 | { |
| 498 | struct rt6_info *rt; /* Route to the other host */ |
| 499 | struct ipv6hdr *iph = ipv6_hdr(skb); |
| 500 | int mtu; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 501 | |
| 502 | EnterFunction(10); |
| 503 | |
David S. Miller | e58b344 | 2011-05-12 18:22:34 -0400 | [diff] [blame] | 504 | if (!(rt = __ip_vs_get_out_rt_v6(skb, NULL, &iph->daddr, NULL, 0, |
| 505 | IP_VS_RT_MODE_NON_LOCAL))) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 506 | goto tx_error_icmp; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 507 | |
| 508 | /* MTU checking */ |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 509 | mtu = dst_mtu(&rt->dst); |
Jesper Dangaard Brouer | 590e3f7 | 2012-08-28 22:05:51 +0200 | [diff] [blame] | 510 | if (__mtu_check_toobig_v6(skb, mtu)) { |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 511 | if (!skb->dev) { |
| 512 | struct net *net = dev_net(skb_dst(skb)->dev); |
| 513 | |
| 514 | skb->dev = net->loopback_dev; |
| 515 | } |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 516 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 517 | dst_release(&rt->dst); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 518 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 519 | goto tx_error; |
| 520 | } |
| 521 | |
| 522 | /* |
| 523 | * Call ip_send_check because we are not sure it is called |
| 524 | * after ip_defrag. Is copy-on-write needed? |
| 525 | */ |
| 526 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 527 | if (unlikely(skb == NULL)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 528 | dst_release(&rt->dst); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 529 | return NF_STOLEN; |
| 530 | } |
| 531 | |
| 532 | /* drop old route */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 533 | skb_dst_drop(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 534 | skb_dst_set(skb, &rt->dst); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 535 | |
| 536 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 537 | skb->local_df = 1; |
| 538 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 539 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 0); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 540 | |
| 541 | LeaveFunction(10); |
| 542 | return NF_STOLEN; |
| 543 | |
| 544 | tx_error_icmp: |
| 545 | dst_link_failure(skb); |
| 546 | tx_error: |
| 547 | kfree_skb(skb); |
| 548 | LeaveFunction(10); |
| 549 | return NF_STOLEN; |
| 550 | } |
| 551 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | |
| 553 | /* |
| 554 | * NAT transmitter (only for outside-to-inside nat forwarding) |
| 555 | * Not used for related ICMP |
| 556 | */ |
| 557 | int |
| 558 | ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, |
| 559 | struct ip_vs_protocol *pp) |
| 560 | { |
| 561 | struct rtable *rt; /* Route to the other host */ |
| 562 | int mtu; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 563 | struct iphdr *iph = ip_hdr(skb); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 564 | int local; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | |
| 566 | EnterFunction(10); |
| 567 | |
| 568 | /* check if it is a connection of no-client-port */ |
| 569 | if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) { |
Al Viro | 014d730 | 2006-09-28 14:29:52 -0700 | [diff] [blame] | 570 | __be16 _pt, *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | p = skb_header_pointer(skb, iph->ihl*4, sizeof(_pt), &_pt); |
| 572 | if (p == NULL) |
| 573 | goto tx_error; |
| 574 | ip_vs_conn_fill_cport(cp, *p); |
| 575 | IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p)); |
| 576 | } |
| 577 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 578 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 579 | RT_TOS(iph->tos), |
| 580 | IP_VS_RT_MODE_LOCAL | |
| 581 | IP_VS_RT_MODE_NON_LOCAL | |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 582 | IP_VS_RT_MODE_RDR, NULL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | goto tx_error_icmp; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 584 | local = rt->rt_flags & RTCF_LOCAL; |
| 585 | /* |
| 586 | * Avoid duplicate tuple in reply direction for NAT traffic |
| 587 | * to local address when connection is sync-ed |
| 588 | */ |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 589 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 590 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
| 591 | enum ip_conntrack_info ctinfo; |
| 592 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); |
| 593 | |
| 594 | if (ct && !nf_ct_is_untracked(ct)) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 595 | IP_VS_DBG_RL_PKT(10, AF_INET, pp, skb, 0, |
| 596 | "ip_vs_nat_xmit(): " |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 597 | "stopping DNAT to local address"); |
| 598 | goto tx_error_put; |
| 599 | } |
| 600 | } |
| 601 | #endif |
| 602 | |
| 603 | /* From world but DNAT to loopback address? */ |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 604 | if (local && ipv4_is_loopback(cp->daddr.ip) && |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 605 | rt_is_input_route(skb_rtable(skb))) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 606 | 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] | 607 | "stopping DNAT to loopback address"); |
| 608 | goto tx_error_put; |
| 609 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
| 611 | /* MTU checking */ |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 612 | mtu = dst_mtu(&rt->dst); |
Simon Horman | 8f1b03a | 2010-11-09 10:08:49 +0900 | [diff] [blame] | 613 | if ((skb->len > mtu) && (iph->frag_off & htons(IP_DF)) && |
| 614 | !skb_is_gso(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 616 | IP_VS_DBG_RL_PKT(0, AF_INET, pp, skb, 0, |
| 617 | "ip_vs_nat_xmit(): frag needed for"); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 618 | goto tx_error_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | /* copy-on-write the packet before mangling it */ |
Herbert Xu | af1e1cf | 2007-10-14 00:39:33 -0700 | [diff] [blame] | 622 | if (!skb_make_writable(skb, sizeof(struct iphdr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | goto tx_error_put; |
| 624 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 625 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | goto tx_error_put; |
| 627 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | /* mangle the packet */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 629 | if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp)) |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 630 | goto tx_error_put; |
Julius Volz | e7ade46 | 2008-09-02 15:55:33 +0200 | [diff] [blame] | 631 | ip_hdr(skb)->daddr = cp->daddr.ip; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 632 | ip_send_check(ip_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 634 | if (!local) { |
| 635 | /* drop old route */ |
| 636 | skb_dst_drop(skb); |
| 637 | skb_dst_set(skb, &rt->dst); |
| 638 | } else { |
| 639 | ip_rt_put(rt); |
| 640 | /* |
| 641 | * Some IPv4 replies get local address from routes, |
| 642 | * not from iph, so while we DNAT after routing |
| 643 | * we need this second input/output route. |
| 644 | */ |
| 645 | if (!__ip_vs_reroute_locally(skb)) |
| 646 | goto tx_error; |
| 647 | } |
| 648 | |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 649 | IP_VS_DBG_PKT(10, AF_INET, pp, skb, 0, "After DNAT"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | |
| 651 | /* FIXME: when application helper enlarges the packet and the length |
| 652 | is larger than the MTU of outgoing device, there will be still |
| 653 | MTU problem. */ |
| 654 | |
| 655 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 656 | skb->local_df = 1; |
| 657 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 658 | IP_VS_XMIT_NAT(NFPROTO_IPV4, skb, cp, local); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
| 660 | LeaveFunction(10); |
| 661 | return NF_STOLEN; |
| 662 | |
| 663 | tx_error_icmp: |
| 664 | dst_link_failure(skb); |
| 665 | tx_error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | kfree_skb(skb); |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 667 | LeaveFunction(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | return NF_STOLEN; |
| 669 | tx_error_put: |
| 670 | ip_rt_put(rt); |
| 671 | goto tx_error; |
| 672 | } |
| 673 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 674 | #ifdef CONFIG_IP_VS_IPV6 |
| 675 | int |
| 676 | ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, |
| 677 | struct ip_vs_protocol *pp) |
| 678 | { |
| 679 | struct rt6_info *rt; /* Route to the other host */ |
| 680 | int mtu; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 681 | int local; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 682 | |
| 683 | EnterFunction(10); |
| 684 | |
| 685 | /* check if it is a connection of no-client-port */ |
| 686 | if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) { |
| 687 | __be16 _pt, *p; |
| 688 | p = skb_header_pointer(skb, sizeof(struct ipv6hdr), |
| 689 | sizeof(_pt), &_pt); |
| 690 | if (p == NULL) |
| 691 | goto tx_error; |
| 692 | ip_vs_conn_fill_cport(cp, *p); |
| 693 | IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p)); |
| 694 | } |
| 695 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 696 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
David S. Miller | e58b344 | 2011-05-12 18:22:34 -0400 | [diff] [blame] | 697 | 0, (IP_VS_RT_MODE_LOCAL | |
| 698 | IP_VS_RT_MODE_NON_LOCAL | |
| 699 | IP_VS_RT_MODE_RDR)))) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 700 | goto tx_error_icmp; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 701 | local = __ip_vs_is_local_route6(rt); |
| 702 | /* |
| 703 | * Avoid duplicate tuple in reply direction for NAT traffic |
| 704 | * to local address when connection is sync-ed |
| 705 | */ |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 706 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 707 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
| 708 | enum ip_conntrack_info ctinfo; |
| 709 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); |
| 710 | |
| 711 | if (ct && !nf_ct_is_untracked(ct)) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 712 | IP_VS_DBG_RL_PKT(10, AF_INET6, pp, skb, 0, |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 713 | "ip_vs_nat_xmit_v6(): " |
| 714 | "stopping DNAT to local address"); |
| 715 | goto tx_error_put; |
| 716 | } |
| 717 | } |
| 718 | #endif |
| 719 | |
| 720 | /* From world but DNAT to loopback address? */ |
| 721 | if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) && |
| 722 | ipv6_addr_type(&rt->rt6i_dst.addr) & IPV6_ADDR_LOOPBACK) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 723 | IP_VS_DBG_RL_PKT(1, AF_INET6, pp, skb, 0, |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 724 | "ip_vs_nat_xmit_v6(): " |
| 725 | "stopping DNAT to loopback address"); |
| 726 | goto tx_error_put; |
| 727 | } |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 728 | |
| 729 | /* MTU checking */ |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 730 | mtu = dst_mtu(&rt->dst); |
Jesper Dangaard Brouer | 590e3f7 | 2012-08-28 22:05:51 +0200 | [diff] [blame] | 731 | if (__mtu_check_toobig_v6(skb, mtu)) { |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 732 | if (!skb->dev) { |
| 733 | struct net *net = dev_net(skb_dst(skb)->dev); |
| 734 | |
| 735 | skb->dev = net->loopback_dev; |
| 736 | } |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 737 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 738 | IP_VS_DBG_RL_PKT(0, AF_INET6, pp, skb, 0, |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 739 | "ip_vs_nat_xmit_v6(): frag needed for"); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 740 | goto tx_error_put; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 741 | } |
| 742 | |
| 743 | /* copy-on-write the packet before mangling it */ |
| 744 | if (!skb_make_writable(skb, sizeof(struct ipv6hdr))) |
| 745 | goto tx_error_put; |
| 746 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 747 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 748 | goto tx_error_put; |
| 749 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 750 | /* mangle the packet */ |
| 751 | if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp)) |
| 752 | goto tx_error; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 753 | ipv6_hdr(skb)->daddr = cp->daddr.in6; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 754 | |
| 755 | if (!local || !skb->dev) { |
| 756 | /* drop the old route when skb is not shared */ |
| 757 | skb_dst_drop(skb); |
| 758 | skb_dst_set(skb, &rt->dst); |
| 759 | } else { |
| 760 | /* destined to loopback, do we need to change route? */ |
| 761 | dst_release(&rt->dst); |
| 762 | } |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 763 | |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 764 | IP_VS_DBG_PKT(10, AF_INET6, pp, skb, 0, "After DNAT"); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 765 | |
| 766 | /* FIXME: when application helper enlarges the packet and the length |
| 767 | is larger than the MTU of outgoing device, there will be still |
| 768 | MTU problem. */ |
| 769 | |
| 770 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 771 | skb->local_df = 1; |
| 772 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 773 | IP_VS_XMIT_NAT(NFPROTO_IPV6, skb, cp, local); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 774 | |
| 775 | LeaveFunction(10); |
| 776 | return NF_STOLEN; |
| 777 | |
| 778 | tx_error_icmp: |
| 779 | dst_link_failure(skb); |
| 780 | tx_error: |
| 781 | LeaveFunction(10); |
| 782 | kfree_skb(skb); |
| 783 | return NF_STOLEN; |
| 784 | tx_error_put: |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 785 | dst_release(&rt->dst); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 786 | goto tx_error; |
| 787 | } |
| 788 | #endif |
| 789 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
| 791 | /* |
| 792 | * IP Tunneling transmitter |
| 793 | * |
| 794 | * This function encapsulates the packet in a new IP packet, its |
| 795 | * destination will be set to cp->daddr. Most code of this function |
| 796 | * is taken from ipip.c. |
| 797 | * |
| 798 | * It is used in VS/TUN cluster. The load balancer selects a real |
| 799 | * server from a cluster based on a scheduling algorithm, |
| 800 | * encapsulates the request packet and forwards it to the selected |
| 801 | * server. For example, all real servers are configured with |
| 802 | * "ifconfig tunl0 <Virtual IP Address> up". When the server receives |
| 803 | * the encapsulated packet, it will decapsulate the packet, processe |
| 804 | * the request and return the response packets directly to the client |
| 805 | * without passing the load balancer. This can greatly increase the |
| 806 | * scalability of virtual server. |
| 807 | * |
| 808 | * Used for ANY protocol |
| 809 | */ |
| 810 | int |
| 811 | ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, |
| 812 | struct ip_vs_protocol *pp) |
| 813 | { |
Julian Anastasov | 3654e61 | 2012-07-20 11:59:53 +0300 | [diff] [blame] | 814 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | struct rtable *rt; /* Route to the other host */ |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 816 | __be32 saddr; /* Source for tunnel */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | struct net_device *tdev; /* Device to other host */ |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 818 | struct iphdr *old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | u8 tos = old_iph->tos; |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 820 | __be16 df; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | struct iphdr *iph; /* Our new IP header */ |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 822 | unsigned int max_headroom; /* The extra header space needed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | int mtu; |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 824 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | |
| 826 | EnterFunction(10); |
| 827 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 828 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 829 | RT_TOS(tos), IP_VS_RT_MODE_LOCAL | |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 830 | IP_VS_RT_MODE_NON_LOCAL | |
| 831 | IP_VS_RT_MODE_CONNECT, |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 832 | &saddr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | goto tx_error_icmp; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 834 | if (rt->rt_flags & RTCF_LOCAL) { |
| 835 | ip_rt_put(rt); |
| 836 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1); |
| 837 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 839 | tdev = rt->dst.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 841 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | if (mtu < 68) { |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 843 | IP_VS_DBG_RL("%s(): mtu less than 68\n", __func__); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 844 | goto tx_error_put; |
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 | if (rt_is_output_route(skb_rtable(skb))) |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 847 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
Julian Anastasov | f2edb9f | 2012-07-20 11:59:52 +0300 | [diff] [blame] | 849 | /* Copy DF, reset fragment offset and MF */ |
Julian Anastasov | 3654e61 | 2012-07-20 11:59:53 +0300 | [diff] [blame] | 850 | 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] | 851 | |
Julian Anastasov | 3654e61 | 2012-07-20 11:59:53 +0300 | [diff] [blame] | 852 | if (df && mtu < ntohs(old_iph->tot_len) && !skb_is_gso(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 854 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 855 | goto tx_error_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
| 857 | |
| 858 | /* |
| 859 | * Okay, now see if we can stuff it in the buffer as-is. |
| 860 | */ |
| 861 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr); |
| 862 | |
| 863 | if (skb_headroom(skb) < max_headroom |
| 864 | || skb_cloned(skb) || skb_shared(skb)) { |
| 865 | struct sk_buff *new_skb = |
| 866 | skb_realloc_headroom(skb, max_headroom); |
| 867 | if (!new_skb) { |
| 868 | ip_rt_put(rt); |
| 869 | kfree_skb(skb); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 870 | IP_VS_ERR_RL("%s(): no memory\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | return NF_STOLEN; |
| 872 | } |
Eric Dumazet | 5d0ba55 | 2012-06-04 01:17:19 +0000 | [diff] [blame] | 873 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | skb = new_skb; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 875 | old_iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | } |
| 877 | |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 878 | skb->transport_header = skb->network_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
| 880 | /* fix old IP header checksum */ |
| 881 | ip_send_check(old_iph); |
| 882 | |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 883 | skb_push(skb, sizeof(struct iphdr)); |
| 884 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
| 886 | |
| 887 | /* drop old route */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 888 | skb_dst_drop(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 889 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | |
| 891 | /* |
| 892 | * Push down and install the IPIP header. |
| 893 | */ |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 894 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | iph->version = 4; |
| 896 | iph->ihl = sizeof(struct iphdr)>>2; |
| 897 | iph->frag_off = df; |
| 898 | iph->protocol = IPPROTO_IPIP; |
| 899 | iph->tos = tos; |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 900 | iph->daddr = cp->daddr.ip; |
| 901 | iph->saddr = saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | iph->ttl = old_iph->ttl; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 903 | ip_select_ident(iph, &rt->dst, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | |
| 905 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 906 | skb->local_df = 1; |
| 907 | |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 908 | ret = IP_VS_XMIT_TUNNEL(skb, cp); |
| 909 | if (ret == NF_ACCEPT) |
| 910 | ip_local_out(skb); |
| 911 | else if (ret == NF_DROP) |
| 912 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
| 914 | LeaveFunction(10); |
| 915 | |
| 916 | return NF_STOLEN; |
| 917 | |
| 918 | tx_error_icmp: |
| 919 | dst_link_failure(skb); |
| 920 | tx_error: |
| 921 | kfree_skb(skb); |
| 922 | LeaveFunction(10); |
| 923 | return NF_STOLEN; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 924 | tx_error_put: |
| 925 | ip_rt_put(rt); |
| 926 | goto tx_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | } |
| 928 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 929 | #ifdef CONFIG_IP_VS_IPV6 |
| 930 | int |
| 931 | ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, |
| 932 | struct ip_vs_protocol *pp) |
| 933 | { |
| 934 | struct rt6_info *rt; /* Route to the other host */ |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 935 | struct in6_addr saddr; /* Source for tunnel */ |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 936 | struct net_device *tdev; /* Device to other host */ |
| 937 | struct ipv6hdr *old_iph = ipv6_hdr(skb); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 938 | struct ipv6hdr *iph; /* Our new IP header */ |
| 939 | unsigned int max_headroom; /* The extra header space needed */ |
| 940 | int mtu; |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 941 | int ret; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 942 | |
| 943 | EnterFunction(10); |
| 944 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 945 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, |
David S. Miller | e58b344 | 2011-05-12 18:22:34 -0400 | [diff] [blame] | 946 | &saddr, 1, (IP_VS_RT_MODE_LOCAL | |
| 947 | IP_VS_RT_MODE_NON_LOCAL)))) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 948 | goto tx_error_icmp; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 949 | if (__ip_vs_is_local_route6(rt)) { |
| 950 | dst_release(&rt->dst); |
| 951 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 1); |
| 952 | } |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 953 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 954 | tdev = rt->dst.dev; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 955 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 956 | mtu = dst_mtu(&rt->dst) - sizeof(struct ipv6hdr); |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 957 | if (mtu < IPV6_MIN_MTU) { |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 958 | IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__, |
| 959 | IPV6_MIN_MTU); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 960 | goto tx_error_put; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 961 | } |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 962 | if (skb_dst(skb)) |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 963 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 964 | |
Jesper Dangaard Brouer | 590e3f7 | 2012-08-28 22:05:51 +0200 | [diff] [blame] | 965 | /* MTU checking: Notice that 'mtu' have been adjusted before hand */ |
| 966 | if (__mtu_check_toobig_v6(skb, mtu)) { |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 967 | if (!skb->dev) { |
| 968 | struct net *net = dev_net(skb_dst(skb)->dev); |
| 969 | |
| 970 | skb->dev = net->loopback_dev; |
| 971 | } |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 972 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 973 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 974 | goto tx_error_put; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 975 | } |
| 976 | |
| 977 | /* |
| 978 | * Okay, now see if we can stuff it in the buffer as-is. |
| 979 | */ |
| 980 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct ipv6hdr); |
| 981 | |
| 982 | if (skb_headroom(skb) < max_headroom |
| 983 | || skb_cloned(skb) || skb_shared(skb)) { |
| 984 | struct sk_buff *new_skb = |
| 985 | skb_realloc_headroom(skb, max_headroom); |
| 986 | if (!new_skb) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 987 | dst_release(&rt->dst); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 988 | kfree_skb(skb); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 989 | IP_VS_ERR_RL("%s(): no memory\n", __func__); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 990 | return NF_STOLEN; |
| 991 | } |
Eric Dumazet | 5d0ba55 | 2012-06-04 01:17:19 +0000 | [diff] [blame] | 992 | consume_skb(skb); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 993 | skb = new_skb; |
| 994 | old_iph = ipv6_hdr(skb); |
| 995 | } |
| 996 | |
Hans Schillstrom | 714f095 | 2010-10-19 10:38:48 +0200 | [diff] [blame] | 997 | skb->transport_header = skb->network_header; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 998 | |
| 999 | skb_push(skb, sizeof(struct ipv6hdr)); |
| 1000 | skb_reset_network_header(skb); |
| 1001 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
| 1002 | |
| 1003 | /* drop old route */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1004 | skb_dst_drop(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1005 | skb_dst_set(skb, &rt->dst); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1006 | |
| 1007 | /* |
| 1008 | * Push down and install the IPIP header. |
| 1009 | */ |
| 1010 | iph = ipv6_hdr(skb); |
| 1011 | iph->version = 6; |
| 1012 | iph->nexthdr = IPPROTO_IPV6; |
Harvey Harrison | b7b45f4 | 2008-11-10 16:46:06 -0800 | [diff] [blame] | 1013 | iph->payload_len = old_iph->payload_len; |
| 1014 | be16_add_cpu(&iph->payload_len, sizeof(*old_iph)); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1015 | iph->priority = old_iph->priority; |
| 1016 | memset(&iph->flow_lbl, 0, sizeof(iph->flow_lbl)); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 1017 | iph->daddr = cp->daddr.in6; |
| 1018 | iph->saddr = saddr; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1019 | iph->hop_limit = old_iph->hop_limit; |
| 1020 | |
| 1021 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 1022 | skb->local_df = 1; |
| 1023 | |
Julian Anastasov | f4bc17c | 2010-09-21 17:35:41 +0200 | [diff] [blame] | 1024 | ret = IP_VS_XMIT_TUNNEL(skb, cp); |
| 1025 | if (ret == NF_ACCEPT) |
| 1026 | ip6_local_out(skb); |
| 1027 | else if (ret == NF_DROP) |
| 1028 | kfree_skb(skb); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1029 | |
| 1030 | LeaveFunction(10); |
| 1031 | |
| 1032 | return NF_STOLEN; |
| 1033 | |
| 1034 | tx_error_icmp: |
| 1035 | dst_link_failure(skb); |
| 1036 | tx_error: |
| 1037 | kfree_skb(skb); |
| 1038 | LeaveFunction(10); |
| 1039 | return NF_STOLEN; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1040 | tx_error_put: |
| 1041 | dst_release(&rt->dst); |
| 1042 | goto tx_error; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1043 | } |
| 1044 | #endif |
| 1045 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | |
| 1047 | /* |
| 1048 | * Direct Routing transmitter |
| 1049 | * Used for ANY protocol |
| 1050 | */ |
| 1051 | int |
| 1052 | ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, |
| 1053 | struct ip_vs_protocol *pp) |
| 1054 | { |
| 1055 | struct rtable *rt; /* Route to the other host */ |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1056 | struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | int mtu; |
| 1058 | |
| 1059 | EnterFunction(10); |
| 1060 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1061 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 1062 | RT_TOS(iph->tos), |
| 1063 | IP_VS_RT_MODE_LOCAL | |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 1064 | IP_VS_RT_MODE_NON_LOCAL, NULL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | goto tx_error_icmp; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1066 | if (rt->rt_flags & RTCF_LOCAL) { |
| 1067 | ip_rt_put(rt); |
| 1068 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1); |
| 1069 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | |
| 1071 | /* MTU checking */ |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1072 | mtu = dst_mtu(&rt->dst); |
Simon Horman | 8f1b03a | 2010-11-09 10:08:49 +0900 | [diff] [blame] | 1073 | if ((iph->frag_off & htons(IP_DF)) && skb->len > mtu && |
| 1074 | !skb_is_gso(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); |
| 1076 | ip_rt_put(rt); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 1077 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | goto tx_error; |
| 1079 | } |
| 1080 | |
| 1081 | /* |
| 1082 | * Call ip_send_check because we are not sure it is called |
| 1083 | * after ip_defrag. Is copy-on-write needed? |
| 1084 | */ |
| 1085 | if (unlikely((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)) { |
| 1086 | ip_rt_put(rt); |
| 1087 | return NF_STOLEN; |
| 1088 | } |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1089 | ip_send_check(ip_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | |
| 1091 | /* drop old route */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1092 | skb_dst_drop(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1093 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | |
| 1095 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 1096 | skb->local_df = 1; |
| 1097 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1098 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | |
| 1100 | LeaveFunction(10); |
| 1101 | return NF_STOLEN; |
| 1102 | |
| 1103 | tx_error_icmp: |
| 1104 | dst_link_failure(skb); |
| 1105 | tx_error: |
| 1106 | kfree_skb(skb); |
| 1107 | LeaveFunction(10); |
| 1108 | return NF_STOLEN; |
| 1109 | } |
| 1110 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1111 | #ifdef CONFIG_IP_VS_IPV6 |
| 1112 | int |
| 1113 | ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, |
| 1114 | struct ip_vs_protocol *pp) |
| 1115 | { |
| 1116 | struct rt6_info *rt; /* Route to the other host */ |
| 1117 | int mtu; |
| 1118 | |
| 1119 | EnterFunction(10); |
| 1120 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1121 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
David S. Miller | e58b344 | 2011-05-12 18:22:34 -0400 | [diff] [blame] | 1122 | 0, (IP_VS_RT_MODE_LOCAL | |
| 1123 | IP_VS_RT_MODE_NON_LOCAL)))) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1124 | goto tx_error_icmp; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1125 | if (__ip_vs_is_local_route6(rt)) { |
| 1126 | dst_release(&rt->dst); |
| 1127 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 1); |
| 1128 | } |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1129 | |
| 1130 | /* MTU checking */ |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1131 | mtu = dst_mtu(&rt->dst); |
Jesper Dangaard Brouer | 590e3f7 | 2012-08-28 22:05:51 +0200 | [diff] [blame] | 1132 | if (__mtu_check_toobig_v6(skb, mtu)) { |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1133 | if (!skb->dev) { |
| 1134 | struct net *net = dev_net(skb_dst(skb)->dev); |
| 1135 | |
| 1136 | skb->dev = net->loopback_dev; |
| 1137 | } |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 1138 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1139 | dst_release(&rt->dst); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 1140 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1141 | goto tx_error; |
| 1142 | } |
| 1143 | |
| 1144 | /* |
| 1145 | * Call ip_send_check because we are not sure it is called |
| 1146 | * after ip_defrag. Is copy-on-write needed? |
| 1147 | */ |
| 1148 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 1149 | if (unlikely(skb == NULL)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1150 | dst_release(&rt->dst); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1151 | return NF_STOLEN; |
| 1152 | } |
| 1153 | |
| 1154 | /* drop old route */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1155 | skb_dst_drop(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1156 | skb_dst_set(skb, &rt->dst); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1157 | |
| 1158 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 1159 | skb->local_df = 1; |
| 1160 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1161 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 0); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1162 | |
| 1163 | LeaveFunction(10); |
| 1164 | return NF_STOLEN; |
| 1165 | |
| 1166 | tx_error_icmp: |
| 1167 | dst_link_failure(skb); |
| 1168 | tx_error: |
| 1169 | kfree_skb(skb); |
| 1170 | LeaveFunction(10); |
| 1171 | return NF_STOLEN; |
| 1172 | } |
| 1173 | #endif |
| 1174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | |
| 1176 | /* |
| 1177 | * ICMP packet transmitter |
| 1178 | * called by the ip_vs_in_icmp |
| 1179 | */ |
| 1180 | int |
| 1181 | ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 1182 | struct ip_vs_protocol *pp, int offset, unsigned int hooknum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | { |
| 1184 | struct rtable *rt; /* Route to the other host */ |
| 1185 | int mtu; |
| 1186 | int rc; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1187 | int local; |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 1188 | int rt_mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | |
| 1190 | EnterFunction(10); |
| 1191 | |
| 1192 | /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be |
| 1193 | forwarded directly here, because there is no need to |
| 1194 | translate address/port back */ |
| 1195 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) { |
| 1196 | if (cp->packet_xmit) |
| 1197 | rc = cp->packet_xmit(skb, cp, pp); |
| 1198 | else |
| 1199 | rc = NF_ACCEPT; |
| 1200 | /* do not touch skb anymore */ |
| 1201 | atomic_inc(&cp->in_pkts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | goto out; |
| 1203 | } |
| 1204 | |
| 1205 | /* |
| 1206 | * mangle and send the packet here (only for VS/NAT) |
| 1207 | */ |
| 1208 | |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 1209 | /* LOCALNODE from FORWARD hook is not supported */ |
| 1210 | rt_mode = (hooknum != NF_INET_FORWARD) ? |
| 1211 | IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL | |
| 1212 | IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1213 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
Changli Gao | 17a8f8e | 2011-02-24 08:19:57 +0800 | [diff] [blame] | 1214 | RT_TOS(ip_hdr(skb)->tos), |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 1215 | rt_mode, NULL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | goto tx_error_icmp; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1217 | local = rt->rt_flags & RTCF_LOCAL; |
| 1218 | |
| 1219 | /* |
| 1220 | * Avoid duplicate tuple in reply direction for NAT traffic |
| 1221 | * to local address when connection is sync-ed |
| 1222 | */ |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 1223 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1224 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
| 1225 | enum ip_conntrack_info ctinfo; |
| 1226 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); |
| 1227 | |
| 1228 | if (ct && !nf_ct_is_untracked(ct)) { |
| 1229 | IP_VS_DBG(10, "%s(): " |
| 1230 | "stopping DNAT to local address %pI4\n", |
| 1231 | __func__, &cp->daddr.ip); |
| 1232 | goto tx_error_put; |
| 1233 | } |
| 1234 | } |
| 1235 | #endif |
| 1236 | |
| 1237 | /* From world but DNAT to loopback address? */ |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 1238 | if (local && ipv4_is_loopback(cp->daddr.ip) && |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 1239 | rt_is_input_route(skb_rtable(skb))) { |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1240 | IP_VS_DBG(1, "%s(): " |
| 1241 | "stopping DNAT to loopback %pI4\n", |
| 1242 | __func__, &cp->daddr.ip); |
| 1243 | goto tx_error_put; |
| 1244 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | |
| 1246 | /* MTU checking */ |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1247 | mtu = dst_mtu(&rt->dst); |
Simon Horman | 8f1b03a | 2010-11-09 10:08:49 +0900 | [diff] [blame] | 1248 | if ((skb->len > mtu) && (ip_hdr(skb)->frag_off & htons(IP_DF)) && |
| 1249 | !skb_is_gso(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 1251 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1252 | goto tx_error_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | } |
| 1254 | |
| 1255 | /* copy-on-write the packet before mangling it */ |
Herbert Xu | af1e1cf | 2007-10-14 00:39:33 -0700 | [diff] [blame] | 1256 | if (!skb_make_writable(skb, offset)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | goto tx_error_put; |
| 1258 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1259 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | goto tx_error_put; |
| 1261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | ip_vs_nat_icmp(skb, pp, cp, 0); |
| 1263 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1264 | if (!local) { |
| 1265 | /* drop the old route when skb is not shared */ |
| 1266 | skb_dst_drop(skb); |
| 1267 | skb_dst_set(skb, &rt->dst); |
| 1268 | } else { |
| 1269 | ip_rt_put(rt); |
| 1270 | /* |
| 1271 | * Some IPv4 replies get local address from routes, |
| 1272 | * not from iph, so while we DNAT after routing |
| 1273 | * we need this second input/output route. |
| 1274 | */ |
| 1275 | if (!__ip_vs_reroute_locally(skb)) |
| 1276 | goto tx_error; |
| 1277 | } |
| 1278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 1280 | skb->local_df = 1; |
| 1281 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1282 | IP_VS_XMIT_NAT(NFPROTO_IPV4, skb, cp, local); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | |
| 1284 | rc = NF_STOLEN; |
| 1285 | goto out; |
| 1286 | |
| 1287 | tx_error_icmp: |
| 1288 | dst_link_failure(skb); |
| 1289 | tx_error: |
| 1290 | dev_kfree_skb(skb); |
| 1291 | rc = NF_STOLEN; |
| 1292 | out: |
| 1293 | LeaveFunction(10); |
| 1294 | return rc; |
| 1295 | tx_error_put: |
| 1296 | ip_rt_put(rt); |
| 1297 | goto tx_error; |
| 1298 | } |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1299 | |
| 1300 | #ifdef CONFIG_IP_VS_IPV6 |
| 1301 | int |
| 1302 | ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 1303 | struct ip_vs_protocol *pp, int offset, unsigned int hooknum) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1304 | { |
| 1305 | struct rt6_info *rt; /* Route to the other host */ |
| 1306 | int mtu; |
| 1307 | int rc; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1308 | int local; |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 1309 | int rt_mode; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1310 | |
| 1311 | EnterFunction(10); |
| 1312 | |
| 1313 | /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be |
| 1314 | forwarded directly here, because there is no need to |
| 1315 | translate address/port back */ |
| 1316 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) { |
| 1317 | if (cp->packet_xmit) |
| 1318 | rc = cp->packet_xmit(skb, cp, pp); |
| 1319 | else |
| 1320 | rc = NF_ACCEPT; |
| 1321 | /* do not touch skb anymore */ |
| 1322 | atomic_inc(&cp->in_pkts); |
| 1323 | goto out; |
| 1324 | } |
| 1325 | |
| 1326 | /* |
| 1327 | * mangle and send the packet here (only for VS/NAT) |
| 1328 | */ |
| 1329 | |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 1330 | /* LOCALNODE from FORWARD hook is not supported */ |
| 1331 | rt_mode = (hooknum != NF_INET_FORWARD) ? |
| 1332 | IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL | |
| 1333 | IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL; |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1334 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
Julian Anastasov | c92f5ca | 2011-05-10 12:46:05 +0000 | [diff] [blame] | 1335 | 0, rt_mode))) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1336 | goto tx_error_icmp; |
| 1337 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1338 | local = __ip_vs_is_local_route6(rt); |
| 1339 | /* |
| 1340 | * Avoid duplicate tuple in reply direction for NAT traffic |
| 1341 | * to local address when connection is sync-ed |
| 1342 | */ |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 1343 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1344 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
| 1345 | enum ip_conntrack_info ctinfo; |
| 1346 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); |
| 1347 | |
| 1348 | if (ct && !nf_ct_is_untracked(ct)) { |
| 1349 | IP_VS_DBG(10, "%s(): " |
| 1350 | "stopping DNAT to local address %pI6\n", |
| 1351 | __func__, &cp->daddr.in6); |
| 1352 | goto tx_error_put; |
| 1353 | } |
| 1354 | } |
| 1355 | #endif |
| 1356 | |
| 1357 | /* From world but DNAT to loopback address? */ |
| 1358 | if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) && |
| 1359 | ipv6_addr_type(&rt->rt6i_dst.addr) & IPV6_ADDR_LOOPBACK) { |
| 1360 | IP_VS_DBG(1, "%s(): " |
| 1361 | "stopping DNAT to loopback %pI6\n", |
| 1362 | __func__, &cp->daddr.in6); |
| 1363 | goto tx_error_put; |
| 1364 | } |
| 1365 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1366 | /* MTU checking */ |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1367 | mtu = dst_mtu(&rt->dst); |
Jesper Dangaard Brouer | 590e3f7 | 2012-08-28 22:05:51 +0200 | [diff] [blame] | 1368 | if (__mtu_check_toobig_v6(skb, mtu)) { |
Julian Anastasov | cb59155 | 2010-10-17 16:40:51 +0300 | [diff] [blame] | 1369 | if (!skb->dev) { |
| 1370 | struct net *net = dev_net(skb_dst(skb)->dev); |
| 1371 | |
| 1372 | skb->dev = net->loopback_dev; |
| 1373 | } |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 1374 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 1375 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1376 | goto tx_error_put; |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1377 | } |
| 1378 | |
| 1379 | /* copy-on-write the packet before mangling it */ |
| 1380 | if (!skb_make_writable(skb, offset)) |
| 1381 | goto tx_error_put; |
| 1382 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1383 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1384 | goto tx_error_put; |
| 1385 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1386 | ip_vs_nat_icmp_v6(skb, pp, cp, 0); |
| 1387 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1388 | if (!local || !skb->dev) { |
| 1389 | /* drop the old route when skb is not shared */ |
| 1390 | skb_dst_drop(skb); |
| 1391 | skb_dst_set(skb, &rt->dst); |
| 1392 | } else { |
| 1393 | /* destined to loopback, do we need to change route? */ |
| 1394 | dst_release(&rt->dst); |
| 1395 | } |
| 1396 | |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1397 | /* Another hack: avoid icmp_send in ip_fragment */ |
| 1398 | skb->local_df = 1; |
| 1399 | |
Julian Anastasov | fc60476 | 2010-10-17 16:38:15 +0300 | [diff] [blame] | 1400 | IP_VS_XMIT_NAT(NFPROTO_IPV6, skb, cp, local); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1401 | |
| 1402 | rc = NF_STOLEN; |
| 1403 | goto out; |
| 1404 | |
| 1405 | tx_error_icmp: |
| 1406 | dst_link_failure(skb); |
| 1407 | tx_error: |
| 1408 | dev_kfree_skb(skb); |
| 1409 | rc = NF_STOLEN; |
| 1410 | out: |
| 1411 | LeaveFunction(10); |
| 1412 | return rc; |
| 1413 | tx_error_put: |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1414 | dst_release(&rt->dst); |
Julius Volz | b3cdd2a7 | 2008-09-02 15:55:45 +0200 | [diff] [blame] | 1415 | goto tx_error; |
| 1416 | } |
| 1417 | #endif |