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authorJulius Volz <juliusv@google.com>2008-09-19 12:32:57 +0200
committerSimon Horman <horms@verge.net.au>2008-10-07 08:38:24 +1100
commitcb7f6a7b716e801097b564dec3ccb58d330aef56 (patch)
tree92fa8fa5381e04576c43eab88874ab54ea670767 /net/ipv4/ipvs/ip_vs_proto_udp.c
parent8d5803bf6fbe5264000afc8c34bff08e8ecc023b (diff)
IPVS: Move IPVS to net/netfilter/ipvs
Since IPVS now has partial IPv6 support, this patch moves IPVS from net/ipv4/ipvs to net/netfilter/ipvs. It's a result of: $ git mv net/ipv4/ipvs net/netfilter and adapting the relevant Kconfigs/Makefiles to the new path. Signed-off-by: Julius Volz <juliusv@google.com> Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'net/ipv4/ipvs/ip_vs_proto_udp.c')
-rw-r--r--net/ipv4/ipvs/ip_vs_proto_udp.c533
1 files changed, 0 insertions, 533 deletions
diff --git a/net/ipv4/ipvs/ip_vs_proto_udp.c b/net/ipv4/ipvs/ip_vs_proto_udp.c
deleted file mode 100644
index 6eb6039d634..00000000000
--- a/net/ipv4/ipvs/ip_vs_proto_udp.c
+++ /dev/null
@@ -1,533 +0,0 @@
-/*
- * ip_vs_proto_udp.c: UDP load balancing support for IPVS
- *
- * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
- * Julian Anastasov <ja@ssi.bg>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * Changes:
- *
- */
-
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/kernel.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/udp.h>
-
-#include <net/ip_vs.h>
-#include <net/ip.h>
-#include <net/ip6_checksum.h>
-
-static struct ip_vs_conn *
-udp_conn_in_get(int af, const struct sk_buff *skb, struct ip_vs_protocol *pp,
- const struct ip_vs_iphdr *iph, unsigned int proto_off,
- int inverse)
-{
- struct ip_vs_conn *cp;
- __be16 _ports[2], *pptr;
-
- pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports);
- if (pptr == NULL)
- return NULL;
-
- if (likely(!inverse)) {
- cp = ip_vs_conn_in_get(af, iph->protocol,
- &iph->saddr, pptr[0],
- &iph->daddr, pptr[1]);
- } else {
- cp = ip_vs_conn_in_get(af, iph->protocol,
- &iph->daddr, pptr[1],
- &iph->saddr, pptr[0]);
- }
-
- return cp;
-}
-
-
-static struct ip_vs_conn *
-udp_conn_out_get(int af, const struct sk_buff *skb, struct ip_vs_protocol *pp,
- const struct ip_vs_iphdr *iph, unsigned int proto_off,
- int inverse)
-{
- struct ip_vs_conn *cp;
- __be16 _ports[2], *pptr;
-
- pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports);
- if (pptr == NULL)
- return NULL;
-
- if (likely(!inverse)) {
- cp = ip_vs_conn_out_get(af, iph->protocol,
- &iph->saddr, pptr[0],
- &iph->daddr, pptr[1]);
- } else {
- cp = ip_vs_conn_out_get(af, iph->protocol,
- &iph->daddr, pptr[1],
- &iph->saddr, pptr[0]);
- }
-
- return cp;
-}
-
-
-static int
-udp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,
- int *verdict, struct ip_vs_conn **cpp)
-{
- struct ip_vs_service *svc;
- struct udphdr _udph, *uh;
- struct ip_vs_iphdr iph;
-
- ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
-
- uh = skb_header_pointer(skb, iph.len, sizeof(_udph), &_udph);
- if (uh == NULL) {
- *verdict = NF_DROP;
- return 0;
- }
-
- svc = ip_vs_service_get(af, skb->mark, iph.protocol,
- &iph.daddr, uh->dest);
- if (svc) {
- if (ip_vs_todrop()) {
- /*
- * It seems that we are very loaded.
- * We have to drop this packet :(
- */
- ip_vs_service_put(svc);
- *verdict = NF_DROP;
- return 0;
- }
-
- /*
- * Let the virtual server select a real server for the
- * incoming connection, and create a connection entry.
- */
- *cpp = ip_vs_schedule(svc, skb);
- if (!*cpp) {
- *verdict = ip_vs_leave(svc, skb, pp);
- return 0;
- }
- ip_vs_service_put(svc);
- }
- return 1;
-}
-
-
-static inline void
-udp_fast_csum_update(int af, struct udphdr *uhdr,
- const union nf_inet_addr *oldip,
- const union nf_inet_addr *newip,
- __be16 oldport, __be16 newport)
-{
-#ifdef CONFIG_IP_VS_IPV6
- if (af == AF_INET6)
- uhdr->check =
- csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6,
- ip_vs_check_diff2(oldport, newport,
- ~csum_unfold(uhdr->check))));
- else
-#endif
- uhdr->check =
- csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip,
- ip_vs_check_diff2(oldport, newport,
- ~csum_unfold(uhdr->check))));
- if (!uhdr->check)
- uhdr->check = CSUM_MANGLED_0;
-}
-
-static inline void
-udp_partial_csum_update(int af, struct udphdr *uhdr,
- const union nf_inet_addr *oldip,
- const union nf_inet_addr *newip,
- __be16 oldlen, __be16 newlen)
-{
-#ifdef CONFIG_IP_VS_IPV6
- if (af == AF_INET6)
- uhdr->check =
- csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6,
- ip_vs_check_diff2(oldlen, newlen,
- ~csum_unfold(uhdr->check))));
- else
-#endif
- uhdr->check =
- csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip,
- ip_vs_check_diff2(oldlen, newlen,
- ~csum_unfold(uhdr->check))));
-}
-
-
-static int
-udp_snat_handler(struct sk_buff *skb,
- struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
-{
- struct udphdr *udph;
- unsigned int udphoff;
- int oldlen;
-
-#ifdef CONFIG_IP_VS_IPV6
- if (cp->af == AF_INET6)
- udphoff = sizeof(struct ipv6hdr);
- else
-#endif
- udphoff = ip_hdrlen(skb);
- oldlen = skb->len - udphoff;
-
- /* csum_check requires unshared skb */
- if (!skb_make_writable(skb, udphoff+sizeof(*udph)))
- return 0;
-
- if (unlikely(cp->app != NULL)) {
- /* Some checks before mangling */
- if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
- return 0;
-
- /*
- * Call application helper if needed
- */
- if (!ip_vs_app_pkt_out(cp, skb))
- return 0;
- }
-
- udph = (void *)skb_network_header(skb) + udphoff;
- udph->source = cp->vport;
-
- /*
- * Adjust UDP checksums
- */
- if (skb->ip_summed == CHECKSUM_PARTIAL) {
- udp_partial_csum_update(cp->af, udph, &cp->daddr, &cp->vaddr,
- htonl(oldlen),
- htonl(skb->len - udphoff));
- } else if (!cp->app && (udph->check != 0)) {
- /* Only port and addr are changed, do fast csum update */
- udp_fast_csum_update(cp->af, udph, &cp->daddr, &cp->vaddr,
- cp->dport, cp->vport);
- if (skb->ip_summed == CHECKSUM_COMPLETE)
- skb->ip_summed = CHECKSUM_NONE;
- } else {
- /* full checksum calculation */
- udph->check = 0;
- skb->csum = skb_checksum(skb, udphoff, skb->len - udphoff, 0);
-#ifdef CONFIG_IP_VS_IPV6
- if (cp->af == AF_INET6)
- udph->check = csum_ipv6_magic(&cp->vaddr.in6,
- &cp->caddr.in6,
- skb->len - udphoff,
- cp->protocol, skb->csum);
- else
-#endif
- udph->check = csum_tcpudp_magic(cp->vaddr.ip,
- cp->caddr.ip,
- skb->len - udphoff,
- cp->protocol,
- skb->csum);
- if (udph->check == 0)
- udph->check = CSUM_MANGLED_0;
- IP_VS_DBG(11, "O-pkt: %s O-csum=%d (+%zd)\n",
- pp->name, udph->check,
- (char*)&(udph->check) - (char*)udph);
- }
- return 1;
-}
-
-
-static int
-udp_dnat_handler(struct sk_buff *skb,
- struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
-{
- struct udphdr *udph;
- unsigned int udphoff;
- int oldlen;
-
-#ifdef CONFIG_IP_VS_IPV6
- if (cp->af == AF_INET6)
- udphoff = sizeof(struct ipv6hdr);
- else
-#endif
- udphoff = ip_hdrlen(skb);
- oldlen = skb->len - udphoff;
-
- /* csum_check requires unshared skb */
- if (!skb_make_writable(skb, udphoff+sizeof(*udph)))
- return 0;
-
- if (unlikely(cp->app != NULL)) {
- /* Some checks before mangling */
- if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
- return 0;
-
- /*
- * Attempt ip_vs_app call.
- * It will fix ip_vs_conn
- */
- if (!ip_vs_app_pkt_in(cp, skb))
- return 0;
- }
-
- udph = (void *)skb_network_header(skb) + udphoff;
- udph->dest = cp->dport;
-
- /*
- * Adjust UDP checksums
- */
- if (skb->ip_summed == CHECKSUM_PARTIAL) {
- udp_partial_csum_update(cp->af, udph, &cp->daddr, &cp->vaddr,
- htonl(oldlen),
- htonl(skb->len - udphoff));
- } else if (!cp->app && (udph->check != 0)) {
- /* Only port and addr are changed, do fast csum update */
- udp_fast_csum_update(cp->af, udph, &cp->vaddr, &cp->daddr,
- cp->vport, cp->dport);
- if (skb->ip_summed == CHECKSUM_COMPLETE)
- skb->ip_summed = CHECKSUM_NONE;
- } else {
- /* full checksum calculation */
- udph->check = 0;
- skb->csum = skb_checksum(skb, udphoff, skb->len - udphoff, 0);
-#ifdef CONFIG_IP_VS_IPV6
- if (cp->af == AF_INET6)
- udph->check = csum_ipv6_magic(&cp->caddr.in6,
- &cp->daddr.in6,
- skb->len - udphoff,
- cp->protocol, skb->csum);
- else
-#endif
- udph->check = csum_tcpudp_magic(cp->caddr.ip,
- cp->daddr.ip,
- skb->len - udphoff,
- cp->protocol,
- skb->csum);
- if (udph->check == 0)
- udph->check = CSUM_MANGLED_0;
- skb->ip_summed = CHECKSUM_UNNECESSARY;
- }
- return 1;
-}
-
-
-static int
-udp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp)
-{
- struct udphdr _udph, *uh;
- unsigned int udphoff;
-
-#ifdef CONFIG_IP_VS_IPV6
- if (af == AF_INET6)
- udphoff = sizeof(struct ipv6hdr);
- else
-#endif
- udphoff = ip_hdrlen(skb);
-
- uh = skb_header_pointer(skb, udphoff, sizeof(_udph), &_udph);
- if (uh == NULL)
- return 0;
-
- if (uh->check != 0) {
- switch (skb->ip_summed) {
- case CHECKSUM_NONE:
- skb->csum = skb_checksum(skb, udphoff,
- skb->len - udphoff, 0);
- case CHECKSUM_COMPLETE:
-#ifdef CONFIG_IP_VS_IPV6
- if (af == AF_INET6) {
- if (csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
- &ipv6_hdr(skb)->daddr,
- skb->len - udphoff,
- ipv6_hdr(skb)->nexthdr,
- skb->csum)) {
- IP_VS_DBG_RL_PKT(0, pp, skb, 0,
- "Failed checksum for");
- return 0;
- }
- } else
-#endif
- if (csum_tcpudp_magic(ip_hdr(skb)->saddr,
- ip_hdr(skb)->daddr,
- skb->len - udphoff,
- ip_hdr(skb)->protocol,
- skb->csum)) {
- IP_VS_DBG_RL_PKT(0, pp, skb, 0,
- "Failed checksum for");
- return 0;
- }
- break;
- default:
- /* No need to checksum. */
- break;
- }
- }
- return 1;
-}
-
-
-/*
- * Note: the caller guarantees that only one of register_app,
- * unregister_app or app_conn_bind is called each time.
- */
-
-#define UDP_APP_TAB_BITS 4
-#define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
-#define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
-
-static struct list_head udp_apps[UDP_APP_TAB_SIZE];
-static DEFINE_SPINLOCK(udp_app_lock);
-
-static inline __u16 udp_app_hashkey(__be16 port)
-{
- return (((__force u16)port >> UDP_APP_TAB_BITS) ^ (__force u16)port)
- & UDP_APP_TAB_MASK;
-}
-
-
-static int udp_register_app(struct ip_vs_app *inc)
-{
- struct ip_vs_app *i;
- __u16 hash;
- __be16 port = inc->port;
- int ret = 0;
-
- hash = udp_app_hashkey(port);
-
-
- spin_lock_bh(&udp_app_lock);
- list_for_each_entry(i, &udp_apps[hash], p_list) {
- if (i->port == port) {
- ret = -EEXIST;
- goto out;
- }
- }
- list_add(&inc->p_list, &udp_apps[hash]);
- atomic_inc(&ip_vs_protocol_udp.appcnt);
-
- out:
- spin_unlock_bh(&udp_app_lock);
- return ret;
-}
-
-
-static void
-udp_unregister_app(struct ip_vs_app *inc)
-{
- spin_lock_bh(&udp_app_lock);
- atomic_dec(&ip_vs_protocol_udp.appcnt);
- list_del(&inc->p_list);
- spin_unlock_bh(&udp_app_lock);
-}
-
-
-static int udp_app_conn_bind(struct ip_vs_conn *cp)
-{
- int hash;
- struct ip_vs_app *inc;
- int result = 0;
-
- /* Default binding: bind app only for NAT */
- if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
- return 0;
-
- /* Lookup application incarnations and bind the right one */
- hash = udp_app_hashkey(cp->vport);
-
- spin_lock(&udp_app_lock);
- list_for_each_entry(inc, &udp_apps[hash], p_list) {
- if (inc->port == cp->vport) {
- if (unlikely(!ip_vs_app_inc_get(inc)))
- break;
- spin_unlock(&udp_app_lock);
-
- IP_VS_DBG_BUF(9, "%s: Binding conn %s:%u->"
- "%s:%u to app %s on port %u\n",
- __func__,
- IP_VS_DBG_ADDR(cp->af, &cp->caddr),
- ntohs(cp->cport),
- IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
- ntohs(cp->vport),
- inc->name, ntohs(inc->port));
-
- cp->app = inc;
- if (inc->init_conn)
- result = inc->init_conn(inc, cp);
- goto out;
- }
- }
- spin_unlock(&udp_app_lock);
-
- out:
- return result;
-}
-
-
-static int udp_timeouts[IP_VS_UDP_S_LAST+1] = {
- [IP_VS_UDP_S_NORMAL] = 5*60*HZ,
- [IP_VS_UDP_S_LAST] = 2*HZ,
-};
-
-static char * udp_state_name_table[IP_VS_UDP_S_LAST+1] = {
- [IP_VS_UDP_S_NORMAL] = "UDP",
- [IP_VS_UDP_S_LAST] = "BUG!",
-};
-
-
-static int
-udp_set_state_timeout(struct ip_vs_protocol *pp, char *sname, int to)
-{
- return ip_vs_set_state_timeout(pp->timeout_table, IP_VS_UDP_S_LAST,
- udp_state_name_table, sname, to);
-}
-
-static const char * udp_state_name(int state)
-{
- if (state >= IP_VS_UDP_S_LAST)
- return "ERR!";
- return udp_state_name_table[state] ? udp_state_name_table[state] : "?";
-}
-
-static int
-udp_state_transition(struct ip_vs_conn *cp, int direction,
- const struct sk_buff *skb,
- struct ip_vs_protocol *pp)
-{
- cp->timeout = pp->timeout_table[IP_VS_UDP_S_NORMAL];
- return 1;
-}
-
-static void udp_init(struct ip_vs_protocol *pp)
-{
- IP_VS_INIT_HASH_TABLE(udp_apps);
- pp->timeout_table = udp_timeouts;
-}
-
-static void udp_exit(struct ip_vs_protocol *pp)
-{
-}
-
-
-struct ip_vs_protocol ip_vs_protocol_udp = {
- .name = "UDP",
- .protocol = IPPROTO_UDP,
- .num_states = IP_VS_UDP_S_LAST,
- .dont_defrag = 0,
- .init = udp_init,
- .exit = udp_exit,
- .conn_schedule = udp_conn_schedule,
- .conn_in_get = udp_conn_in_get,
- .conn_out_get = udp_conn_out_get,
- .snat_handler = udp_snat_handler,
- .dnat_handler = udp_dnat_handler,
- .csum_check = udp_csum_check,
- .state_transition = udp_state_transition,
- .state_name = udp_state_name,
- .register_app = udp_register_app,
- .unregister_app = udp_unregister_app,
- .app_conn_bind = udp_app_conn_bind,
- .debug_packet = ip_vs_tcpudp_debug_packet,
- .timeout_change = NULL,
- .set_state_timeout = udp_set_state_timeout,
-};