mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Harvey Harrison](/assets/img/avatar_default.png)
Noticed by sparse: net/netfilter/ipvs/ip_vs_proto_tcp.c:195:6: warning: incorrect type in argument 5 (different base types) net/netfilter/ipvs/ip_vs_proto_tcp.c:195:6: expected restricted __be16 [usertype] oldlen net/netfilter/ipvs/ip_vs_proto_tcp.c:195:6: got restricted __be32 [usertype] <noident> net/netfilter/ipvs/ip_vs_proto_tcp.c:196:6: warning: incorrect type in argument 6 (different base types) net/netfilter/ipvs/ip_vs_proto_tcp.c:196:6: expected restricted __be16 [usertype] newlen net/netfilter/ipvs/ip_vs_proto_tcp.c:196:6: got restricted __be32 [usertype] <noident> net/netfilter/ipvs/ip_vs_proto_tcp.c:270:6: warning: incorrect type in argument 5 (different base types) net/netfilter/ipvs/ip_vs_proto_tcp.c:270:6: expected restricted __be16 [usertype] oldlen net/netfilter/ipvs/ip_vs_proto_tcp.c:270:6: got restricted __be32 [usertype] <noident> net/netfilter/ipvs/ip_vs_proto_tcp.c:271:6: warning: incorrect type in argument 6 (different base types) net/netfilter/ipvs/ip_vs_proto_tcp.c:271:6: expected restricted __be16 [usertype] newlen net/netfilter/ipvs/ip_vs_proto_tcp.c:271:6: got restricted __be32 [usertype] <noident> net/netfilter/ipvs/ip_vs_proto_udp.c:206:6: warning: incorrect type in argument 5 (different base types) net/netfilter/ipvs/ip_vs_proto_udp.c:206:6: expected restricted __be16 [usertype] oldlen net/netfilter/ipvs/ip_vs_proto_udp.c:206:6: got restricted __be32 [usertype] <noident> net/netfilter/ipvs/ip_vs_proto_udp.c:207:6: warning: incorrect type in argument 6 (different base types) net/netfilter/ipvs/ip_vs_proto_udp.c:207:6: expected restricted __be16 [usertype] newlen net/netfilter/ipvs/ip_vs_proto_udp.c:207:6: got restricted __be32 [usertype] <noident> net/netfilter/ipvs/ip_vs_proto_udp.c:282:6: warning: incorrect type in argument 5 (different base types) net/netfilter/ipvs/ip_vs_proto_udp.c:282:6: expected restricted __be16 [usertype] oldlen net/netfilter/ipvs/ip_vs_proto_udp.c:282:6: got restricted __be32 [usertype] <noident> net/netfilter/ipvs/ip_vs_proto_udp.c:283:6: warning: incorrect type in argument 6 (different base types) net/netfilter/ipvs/ip_vs_proto_udp.c:283:6: expected restricted __be16 [usertype] newlen net/netfilter/ipvs/ip_vs_proto_udp.c:283:6: got restricted __be32 [usertype] <noident> Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Acked-by: Simon Horman <horms@verge.net.au> Signed-off-by: David S. Miller <davem@davemloft.net>
533 lines
12 KiB
C
533 lines
12 KiB
C
/*
|
|
* 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,
|
|
htons(oldlen),
|
|
htons(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,
|
|
htons(oldlen),
|
|
htons(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,
|
|
};
|