Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ip_vs_proto_udp.c: UDP load balancing support 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 | * |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 12 | * Changes: Hans Schillstrom <hans.schillstrom@ericsson.com> |
| 13 | * Network name space (netns) aware. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | * |
| 15 | */ |
| 16 | |
Hannes Eder | 9aada7a | 2009-07-30 14:29:44 -0700 | [diff] [blame] | 17 | #define KMSG_COMPONENT "IPVS" |
| 18 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 19 | |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 20 | #include <linux/in.h> |
| 21 | #include <linux/ip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/kernel.h> |
Herbert Xu | af1e1cf | 2007-10-14 00:39:33 -0700 | [diff] [blame] | 23 | #include <linux/netfilter.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/netfilter_ipv4.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 25 | #include <linux/udp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | #include <net/ip_vs.h> |
Arnaldo Carvalho de Melo | c9bdd4b | 2007-03-12 20:09:15 -0300 | [diff] [blame] | 28 | #include <net/ip.h> |
Stephen Rothwell | 63f2c04 | 2008-09-12 23:23:50 -0700 | [diff] [blame] | 29 | #include <net/ip6_checksum.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | static int |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 32 | udp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | int *verdict, struct ip_vs_conn **cpp) |
| 34 | { |
Hans Schillstrom | fc72325 | 2011-01-03 14:44:43 +0100 | [diff] [blame] | 35 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | struct ip_vs_service *svc; |
| 37 | struct udphdr _udph, *uh; |
Julius Volz | 3c2e050 | 2008-09-02 15:55:38 +0200 | [diff] [blame] | 38 | struct ip_vs_iphdr iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 40 | ip_vs_fill_iph_skb(af, skb, &iph); |
Julius Volz | 3c2e050 | 2008-09-02 15:55:38 +0200 | [diff] [blame] | 41 | |
| 42 | uh = skb_header_pointer(skb, iph.len, sizeof(_udph), &_udph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | if (uh == NULL) { |
| 44 | *verdict = NF_DROP; |
| 45 | return 0; |
| 46 | } |
Hans Schillstrom | fc72325 | 2011-01-03 14:44:43 +0100 | [diff] [blame] | 47 | net = skb_net(skb); |
| 48 | svc = ip_vs_service_get(net, af, skb->mark, iph.protocol, |
Julius Volz | 3c2e050 | 2008-09-02 15:55:38 +0200 | [diff] [blame] | 49 | &iph.daddr, uh->dest); |
| 50 | if (svc) { |
Julian Anastasov | 190ecd2 | 2010-10-17 16:24:37 +0300 | [diff] [blame] | 51 | int ignored; |
| 52 | |
Hans Schillstrom | a0840e2 | 2011-01-03 14:44:58 +0100 | [diff] [blame] | 53 | if (ip_vs_todrop(net_ipvs(net))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | /* |
| 55 | * It seems that we are very loaded. |
| 56 | * We have to drop this packet :( |
| 57 | */ |
| 58 | ip_vs_service_put(svc); |
| 59 | *verdict = NF_DROP; |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | /* |
| 64 | * Let the virtual server select a real server for the |
| 65 | * incoming connection, and create a connection entry. |
| 66 | */ |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 67 | *cpp = ip_vs_schedule(svc, skb, pd, &ignored); |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 68 | if (!*cpp && ignored <= 0) { |
| 69 | if (!ignored) |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 70 | *verdict = ip_vs_leave(svc, skb, pd); |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 71 | else { |
| 72 | ip_vs_service_put(svc); |
| 73 | *verdict = NF_DROP; |
| 74 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | return 0; |
| 76 | } |
| 77 | ip_vs_service_put(svc); |
| 78 | } |
Hans Schillstrom | a5959d5 | 2010-11-19 14:25:10 +0100 | [diff] [blame] | 79 | /* NF_ACCEPT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | return 1; |
| 81 | } |
| 82 | |
| 83 | |
| 84 | static inline void |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 85 | udp_fast_csum_update(int af, struct udphdr *uhdr, |
| 86 | const union nf_inet_addr *oldip, |
| 87 | const union nf_inet_addr *newip, |
Al Viro | 014d730 | 2006-09-28 14:29:52 -0700 | [diff] [blame] | 88 | __be16 oldport, __be16 newport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 90 | #ifdef CONFIG_IP_VS_IPV6 |
| 91 | if (af == AF_INET6) |
| 92 | uhdr->check = |
| 93 | csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6, |
| 94 | ip_vs_check_diff2(oldport, newport, |
| 95 | ~csum_unfold(uhdr->check)))); |
| 96 | else |
| 97 | #endif |
| 98 | uhdr->check = |
| 99 | csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip, |
| 100 | ip_vs_check_diff2(oldport, newport, |
| 101 | ~csum_unfold(uhdr->check)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | if (!uhdr->check) |
Al Viro | f6ab028 | 2006-11-16 02:36:50 -0800 | [diff] [blame] | 103 | uhdr->check = CSUM_MANGLED_0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | } |
| 105 | |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 106 | static inline void |
| 107 | udp_partial_csum_update(int af, struct udphdr *uhdr, |
| 108 | const union nf_inet_addr *oldip, |
| 109 | const union nf_inet_addr *newip, |
| 110 | __be16 oldlen, __be16 newlen) |
| 111 | { |
| 112 | #ifdef CONFIG_IP_VS_IPV6 |
| 113 | if (af == AF_INET6) |
| 114 | uhdr->check = |
Julian Anastasov | 5bc9068 | 2010-10-17 16:14:31 +0300 | [diff] [blame] | 115 | ~csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6, |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 116 | ip_vs_check_diff2(oldlen, newlen, |
Julian Anastasov | 5bc9068 | 2010-10-17 16:14:31 +0300 | [diff] [blame] | 117 | csum_unfold(uhdr->check)))); |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 118 | else |
| 119 | #endif |
| 120 | uhdr->check = |
Julian Anastasov | 5bc9068 | 2010-10-17 16:14:31 +0300 | [diff] [blame] | 121 | ~csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip, |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 122 | ip_vs_check_diff2(oldlen, newlen, |
Julian Anastasov | 5bc9068 | 2010-10-17 16:14:31 +0300 | [diff] [blame] | 123 | csum_unfold(uhdr->check)))); |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 124 | } |
| 125 | |
| 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | static int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 128 | udp_snat_handler(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp) |
| 130 | { |
| 131 | struct udphdr *udph; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 132 | unsigned int udphoff; |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 133 | int oldlen; |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 134 | int payload_csum = 0; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 135 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 136 | struct ip_vs_iphdr iph; |
| 137 | ip_vs_fill_iph_skb(cp->af, skb, &iph); |
| 138 | udphoff = iph.len; |
| 139 | |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 140 | #ifdef CONFIG_IP_VS_IPV6 |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 141 | if (cp->af == AF_INET6 && iph.fragoffs) |
| 142 | return 1; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 143 | #endif |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 144 | oldlen = skb->len - udphoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
| 146 | /* csum_check requires unshared skb */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 147 | if (!skb_make_writable(skb, udphoff+sizeof(*udph))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | return 0; |
| 149 | |
| 150 | if (unlikely(cp->app != NULL)) { |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 151 | int ret; |
| 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | /* Some checks before mangling */ |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 154 | if (pp->csum_check && !pp->csum_check(cp->af, skb, pp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | return 0; |
| 156 | |
| 157 | /* |
| 158 | * Call application helper if needed |
| 159 | */ |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 160 | if (!(ret = ip_vs_app_pkt_out(cp, skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | return 0; |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 162 | /* ret=2: csum update is needed after payload mangling */ |
| 163 | if (ret == 1) |
| 164 | oldlen = skb->len - udphoff; |
| 165 | else |
| 166 | payload_csum = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | } |
| 168 | |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 169 | udph = (void *)skb_network_header(skb) + udphoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | udph->source = cp->vport; |
| 171 | |
| 172 | /* |
| 173 | * Adjust UDP checksums |
| 174 | */ |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 175 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 176 | udp_partial_csum_update(cp->af, udph, &cp->daddr, &cp->vaddr, |
Harvey Harrison | ca62059 | 2008-11-06 23:09:56 -0800 | [diff] [blame] | 177 | htons(oldlen), |
| 178 | htons(skb->len - udphoff)); |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 179 | } else if (!payload_csum && (udph->check != 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | /* Only port and addr are changed, do fast csum update */ |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 181 | udp_fast_csum_update(cp->af, udph, &cp->daddr, &cp->vaddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | cp->dport, cp->vport); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 183 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 184 | skb->ip_summed = (cp->app && pp->csum_check) ? |
| 185 | CHECKSUM_UNNECESSARY : CHECKSUM_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | } else { |
| 187 | /* full checksum calculation */ |
| 188 | udph->check = 0; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 189 | skb->csum = skb_checksum(skb, udphoff, skb->len - udphoff, 0); |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 190 | #ifdef CONFIG_IP_VS_IPV6 |
| 191 | if (cp->af == AF_INET6) |
| 192 | udph->check = csum_ipv6_magic(&cp->vaddr.in6, |
| 193 | &cp->caddr.in6, |
| 194 | skb->len - udphoff, |
| 195 | cp->protocol, skb->csum); |
| 196 | else |
| 197 | #endif |
| 198 | udph->check = csum_tcpudp_magic(cp->vaddr.ip, |
| 199 | cp->caddr.ip, |
| 200 | skb->len - udphoff, |
| 201 | cp->protocol, |
| 202 | skb->csum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | if (udph->check == 0) |
Al Viro | f6ab028 | 2006-11-16 02:36:50 -0800 | [diff] [blame] | 204 | udph->check = CSUM_MANGLED_0; |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 205 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | IP_VS_DBG(11, "O-pkt: %s O-csum=%d (+%zd)\n", |
| 207 | pp->name, udph->check, |
| 208 | (char*)&(udph->check) - (char*)udph); |
| 209 | } |
| 210 | return 1; |
| 211 | } |
| 212 | |
| 213 | |
| 214 | static int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 215 | udp_dnat_handler(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp) |
| 217 | { |
| 218 | struct udphdr *udph; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 219 | unsigned int udphoff; |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 220 | int oldlen; |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 221 | int payload_csum = 0; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 222 | |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 223 | struct ip_vs_iphdr iph; |
| 224 | ip_vs_fill_iph_skb(cp->af, skb, &iph); |
| 225 | udphoff = iph.len; |
| 226 | |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 227 | #ifdef CONFIG_IP_VS_IPV6 |
Jesper Dangaard Brouer | 63dca2c | 2012-09-26 14:06:41 +0200 | [diff] [blame] | 228 | if (cp->af == AF_INET6 && iph.fragoffs) |
| 229 | return 1; |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 230 | #endif |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 231 | oldlen = skb->len - udphoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
| 233 | /* csum_check requires unshared skb */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 234 | if (!skb_make_writable(skb, udphoff+sizeof(*udph))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | return 0; |
| 236 | |
| 237 | if (unlikely(cp->app != NULL)) { |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 238 | int ret; |
| 239 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | /* Some checks before mangling */ |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 241 | if (pp->csum_check && !pp->csum_check(cp->af, skb, pp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | return 0; |
| 243 | |
| 244 | /* |
| 245 | * Attempt ip_vs_app call. |
| 246 | * It will fix ip_vs_conn |
| 247 | */ |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 248 | if (!(ret = ip_vs_app_pkt_in(cp, skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | return 0; |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 250 | /* ret=2: csum update is needed after payload mangling */ |
| 251 | if (ret == 1) |
| 252 | oldlen = skb->len - udphoff; |
| 253 | else |
| 254 | payload_csum = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | } |
| 256 | |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 257 | udph = (void *)skb_network_header(skb) + udphoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | udph->dest = cp->dport; |
| 259 | |
| 260 | /* |
| 261 | * Adjust UDP checksums |
| 262 | */ |
Simon Horman | 503e81f | 2008-09-08 12:04:21 +1000 | [diff] [blame] | 263 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Julian Anastasov | 5bc9068 | 2010-10-17 16:14:31 +0300 | [diff] [blame] | 264 | udp_partial_csum_update(cp->af, udph, &cp->vaddr, &cp->daddr, |
Harvey Harrison | ca62059 | 2008-11-06 23:09:56 -0800 | [diff] [blame] | 265 | htons(oldlen), |
| 266 | htons(skb->len - udphoff)); |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 267 | } else if (!payload_csum && (udph->check != 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | /* Only port and addr are changed, do fast csum update */ |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 269 | udp_fast_csum_update(cp->af, udph, &cp->vaddr, &cp->daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | cp->vport, cp->dport); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 271 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
Julian Anastasov | 8b27b10 | 2010-10-17 16:17:20 +0300 | [diff] [blame] | 272 | skb->ip_summed = (cp->app && pp->csum_check) ? |
| 273 | CHECKSUM_UNNECESSARY : CHECKSUM_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | } else { |
| 275 | /* full checksum calculation */ |
| 276 | udph->check = 0; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 277 | skb->csum = skb_checksum(skb, udphoff, skb->len - udphoff, 0); |
Julius Volz | 0bbdd42 | 2008-09-02 15:55:42 +0200 | [diff] [blame] | 278 | #ifdef CONFIG_IP_VS_IPV6 |
| 279 | if (cp->af == AF_INET6) |
| 280 | udph->check = csum_ipv6_magic(&cp->caddr.in6, |
| 281 | &cp->daddr.in6, |
| 282 | skb->len - udphoff, |
| 283 | cp->protocol, skb->csum); |
| 284 | else |
| 285 | #endif |
| 286 | udph->check = csum_tcpudp_magic(cp->caddr.ip, |
| 287 | cp->daddr.ip, |
| 288 | skb->len - udphoff, |
| 289 | cp->protocol, |
| 290 | skb->csum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | if (udph->check == 0) |
Al Viro | f6ab028 | 2006-11-16 02:36:50 -0800 | [diff] [blame] | 292 | udph->check = CSUM_MANGLED_0; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 293 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | return 1; |
| 296 | } |
| 297 | |
| 298 | |
| 299 | static int |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 300 | udp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | { |
| 302 | struct udphdr _udph, *uh; |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 303 | unsigned int udphoff; |
| 304 | |
| 305 | #ifdef CONFIG_IP_VS_IPV6 |
| 306 | if (af == AF_INET6) |
| 307 | udphoff = sizeof(struct ipv6hdr); |
| 308 | else |
| 309 | #endif |
| 310 | udphoff = ip_hdrlen(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
| 312 | uh = skb_header_pointer(skb, udphoff, sizeof(_udph), &_udph); |
| 313 | if (uh == NULL) |
| 314 | return 0; |
| 315 | |
| 316 | if (uh->check != 0) { |
| 317 | switch (skb->ip_summed) { |
| 318 | case CHECKSUM_NONE: |
| 319 | skb->csum = skb_checksum(skb, udphoff, |
| 320 | skb->len - udphoff, 0); |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 321 | case CHECKSUM_COMPLETE: |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 322 | #ifdef CONFIG_IP_VS_IPV6 |
| 323 | if (af == AF_INET6) { |
| 324 | if (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
| 325 | &ipv6_hdr(skb)->daddr, |
| 326 | skb->len - udphoff, |
| 327 | ipv6_hdr(skb)->nexthdr, |
| 328 | skb->csum)) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 329 | IP_VS_DBG_RL_PKT(0, af, pp, skb, 0, |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 330 | "Failed checksum for"); |
| 331 | return 0; |
| 332 | } |
| 333 | } else |
| 334 | #endif |
| 335 | if (csum_tcpudp_magic(ip_hdr(skb)->saddr, |
| 336 | ip_hdr(skb)->daddr, |
| 337 | skb->len - udphoff, |
| 338 | ip_hdr(skb)->protocol, |
| 339 | skb->csum)) { |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame] | 340 | IP_VS_DBG_RL_PKT(0, af, pp, skb, 0, |
Julius Volz | 51ef348 | 2008-09-02 15:55:40 +0200 | [diff] [blame] | 341 | "Failed checksum for"); |
| 342 | return 0; |
| 343 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | break; |
| 345 | default: |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 346 | /* No need to checksum. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | break; |
| 348 | } |
| 349 | } |
| 350 | return 1; |
| 351 | } |
| 352 | |
Al Viro | 75e7ce6 | 2006-11-14 21:13:28 -0800 | [diff] [blame] | 353 | static inline __u16 udp_app_hashkey(__be16 port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | { |
Al Viro | 75e7ce6 | 2006-11-14 21:13:28 -0800 | [diff] [blame] | 355 | return (((__force u16)port >> UDP_APP_TAB_BITS) ^ (__force u16)port) |
| 356 | & UDP_APP_TAB_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | |
Hans Schillstrom | ab8a5e8 | 2011-01-03 14:44:53 +0100 | [diff] [blame] | 360 | static int udp_register_app(struct net *net, struct ip_vs_app *inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | { |
| 362 | struct ip_vs_app *i; |
Al Viro | 75e7ce6 | 2006-11-14 21:13:28 -0800 | [diff] [blame] | 363 | __u16 hash; |
| 364 | __be16 port = inc->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | int ret = 0; |
Hans Schillstrom | ab8a5e8 | 2011-01-03 14:44:53 +0100 | [diff] [blame] | 366 | struct netns_ipvs *ipvs = net_ipvs(net); |
| 367 | struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_UDP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
| 369 | hash = udp_app_hashkey(port); |
| 370 | |
| 371 | |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 372 | spin_lock_bh(&ipvs->udp_app_lock); |
| 373 | list_for_each_entry(i, &ipvs->udp_apps[hash], p_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | if (i->port == port) { |
| 375 | ret = -EEXIST; |
| 376 | goto out; |
| 377 | } |
| 378 | } |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 379 | list_add(&inc->p_list, &ipvs->udp_apps[hash]); |
Hans Schillstrom | 9bbac6a | 2011-01-03 14:44:52 +0100 | [diff] [blame] | 380 | atomic_inc(&pd->appcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
| 382 | out: |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 383 | spin_unlock_bh(&ipvs->udp_app_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | return ret; |
| 385 | } |
| 386 | |
| 387 | |
| 388 | static void |
Hans Schillstrom | ab8a5e8 | 2011-01-03 14:44:53 +0100 | [diff] [blame] | 389 | udp_unregister_app(struct net *net, struct ip_vs_app *inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | { |
Hans Schillstrom | ab8a5e8 | 2011-01-03 14:44:53 +0100 | [diff] [blame] | 391 | struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_UDP); |
| 392 | struct netns_ipvs *ipvs = net_ipvs(net); |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 393 | |
| 394 | spin_lock_bh(&ipvs->udp_app_lock); |
Hans Schillstrom | 9bbac6a | 2011-01-03 14:44:52 +0100 | [diff] [blame] | 395 | atomic_dec(&pd->appcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | list_del(&inc->p_list); |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 397 | spin_unlock_bh(&ipvs->udp_app_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | } |
| 399 | |
| 400 | |
| 401 | static int udp_app_conn_bind(struct ip_vs_conn *cp) |
| 402 | { |
Hans Schillstrom | 6e67e58 | 2011-01-03 14:44:57 +0100 | [diff] [blame] | 403 | struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(cp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | int hash; |
| 405 | struct ip_vs_app *inc; |
| 406 | int result = 0; |
| 407 | |
| 408 | /* Default binding: bind app only for NAT */ |
| 409 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) |
| 410 | return 0; |
| 411 | |
| 412 | /* Lookup application incarnations and bind the right one */ |
| 413 | hash = udp_app_hashkey(cp->vport); |
| 414 | |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 415 | spin_lock(&ipvs->udp_app_lock); |
| 416 | list_for_each_entry(inc, &ipvs->udp_apps[hash], p_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | if (inc->port == cp->vport) { |
| 418 | if (unlikely(!ip_vs_app_inc_get(inc))) |
| 419 | break; |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 420 | spin_unlock(&ipvs->udp_app_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 422 | IP_VS_DBG_BUF(9, "%s(): Binding conn %s:%u->" |
Julius Volz | cfc78c5 | 2008-09-02 15:55:53 +0200 | [diff] [blame] | 423 | "%s:%u to app %s on port %u\n", |
| 424 | __func__, |
| 425 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
| 426 | ntohs(cp->cport), |
| 427 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), |
| 428 | ntohs(cp->vport), |
| 429 | inc->name, ntohs(inc->port)); |
| 430 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | cp->app = inc; |
| 432 | if (inc->init_conn) |
| 433 | result = inc->init_conn(inc, cp); |
| 434 | goto out; |
| 435 | } |
| 436 | } |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 437 | spin_unlock(&ipvs->udp_app_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
| 439 | out: |
| 440 | return result; |
| 441 | } |
| 442 | |
| 443 | |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 444 | static const int udp_timeouts[IP_VS_UDP_S_LAST+1] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | [IP_VS_UDP_S_NORMAL] = 5*60*HZ, |
| 446 | [IP_VS_UDP_S_LAST] = 2*HZ, |
| 447 | }; |
| 448 | |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 449 | static const char *const udp_state_name_table[IP_VS_UDP_S_LAST+1] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | [IP_VS_UDP_S_NORMAL] = "UDP", |
| 451 | [IP_VS_UDP_S_LAST] = "BUG!", |
| 452 | }; |
| 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | static const char * udp_state_name(int state) |
| 455 | { |
| 456 | if (state >= IP_VS_UDP_S_LAST) |
| 457 | return "ERR!"; |
| 458 | return udp_state_name_table[state] ? udp_state_name_table[state] : "?"; |
| 459 | } |
| 460 | |
Simon Horman | 4a516f1 | 2011-09-16 14:11:49 +0900 | [diff] [blame] | 461 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | udp_state_transition(struct ip_vs_conn *cp, int direction, |
| 463 | const struct sk_buff *skb, |
Hans Schillstrom | 9330419 | 2011-01-03 14:44:51 +0100 | [diff] [blame] | 464 | struct ip_vs_proto_data *pd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | { |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 466 | if (unlikely(!pd)) { |
| 467 | pr_err("UDP no ns data\n"); |
Simon Horman | 4a516f1 | 2011-09-16 14:11:49 +0900 | [diff] [blame] | 468 | return; |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | cp->timeout = pd->timeout_table[IP_VS_UDP_S_NORMAL]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | } |
| 473 | |
Hans Schillstrom | 582b8e3 | 2012-04-26 09:45:35 +0200 | [diff] [blame] | 474 | static int __udp_init(struct net *net, struct ip_vs_proto_data *pd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | { |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 476 | struct netns_ipvs *ipvs = net_ipvs(net); |
| 477 | |
| 478 | ip_vs_init_hash_table(ipvs->udp_apps, UDP_APP_TAB_SIZE); |
| 479 | spin_lock_init(&ipvs->udp_app_lock); |
| 480 | pd->timeout_table = ip_vs_create_timeout_table((int *)udp_timeouts, |
| 481 | sizeof(udp_timeouts)); |
Hans Schillstrom | 582b8e3 | 2012-04-26 09:45:35 +0200 | [diff] [blame] | 482 | if (!pd->timeout_table) |
| 483 | return -ENOMEM; |
| 484 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | } |
| 486 | |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 487 | static void __udp_exit(struct net *net, struct ip_vs_proto_data *pd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | { |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 489 | kfree(pd->timeout_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | } |
| 491 | |
| 492 | |
| 493 | struct ip_vs_protocol ip_vs_protocol_udp = { |
| 494 | .name = "UDP", |
| 495 | .protocol = IPPROTO_UDP, |
Julian Anastasov | 2ad17de | 2008-04-29 03:21:23 -0700 | [diff] [blame] | 496 | .num_states = IP_VS_UDP_S_LAST, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | .dont_defrag = 0, |
Hans Schillstrom | 78b16bd | 2011-01-03 14:44:48 +0100 | [diff] [blame] | 498 | .init = NULL, |
| 499 | .exit = NULL, |
| 500 | .init_netns = __udp_init, |
| 501 | .exit_netns = __udp_exit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | .conn_schedule = udp_conn_schedule, |
Simon Horman | 5c0d237 | 2010-08-02 17:12:44 +0200 | [diff] [blame] | 503 | .conn_in_get = ip_vs_conn_in_get_proto, |
| 504 | .conn_out_get = ip_vs_conn_out_get_proto, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | .snat_handler = udp_snat_handler, |
| 506 | .dnat_handler = udp_dnat_handler, |
| 507 | .csum_check = udp_csum_check, |
| 508 | .state_transition = udp_state_transition, |
| 509 | .state_name = udp_state_name, |
| 510 | .register_app = udp_register_app, |
| 511 | .unregister_app = udp_unregister_app, |
| 512 | .app_conn_bind = udp_app_conn_bind, |
| 513 | .debug_packet = ip_vs_tcpudp_debug_packet, |
| 514 | .timeout_change = NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | }; |