diff options
Diffstat (limited to 'net/ipv4/ipvs/ip_vs_proto_udp.c')
| -rw-r--r-- | net/ipv4/ipvs/ip_vs_proto_udp.c | 533 |
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, -}; |