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IPVS: Extend protocol DNAT/SNAT and state handlers

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Extend protocol DNAT/SNAT and state handlers to work with IPv6. Also
change/introduce new checksumming helper functions for this.

Signed-off-by: Julius Volz <juliusv@google.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
This commit is contained in:
Julius Volz 2008-09-02 15:55:42 +02:00 committed by Simon Horman
parent 3b047d9d04
commit 0bbdd42b7e
3 changed files with 142 additions and 36 deletions
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11
include/net/ip_vs.h
View File

@ -904,6 +904,17 @@ static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
return csum_partial((char *) diff, sizeof(diff), oldsum);
}
#ifdef CONFIG_IP_VS_IPV6
static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
__wsum oldsum)
{
__be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
new[3], new[2], new[1], new[0] };
return csum_partial((char *) diff, sizeof(diff), oldsum);
}
#endif
static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
{
__be16 diff[2] = { ~old, new };

85
net/ipv4/ipvs/ip_vs_proto_tcp.c
View File

@ -114,11 +114,21 @@ tcp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,
static inline void
tcp_fast_csum_update(struct tcphdr *tcph, __be32 oldip, __be32 newip,
tcp_fast_csum_update(int af, struct tcphdr *tcph,
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)
tcph->check =
csum_fold(ip_vs_check_diff16(oldip->ip6, newip->ip6,
ip_vs_check_diff2(oldport, newport,
~csum_unfold(tcph->check))));
else
#endif
tcph->check =
csum_fold(ip_vs_check_diff4(oldip, newip,
csum_fold(ip_vs_check_diff4(oldip->ip, newip->ip,
ip_vs_check_diff2(oldport, newport,
~csum_unfold(tcph->check))));
}
@ -129,7 +139,14 @@ tcp_snat_handler(struct sk_buff *skb,
struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
{
struct tcphdr *tcph;
const unsigned int tcphoff = ip_hdrlen(skb);
unsigned int tcphoff;
#ifdef CONFIG_IP_VS_IPV6
if (cp->af == AF_INET6)
tcphoff = sizeof(struct ipv6hdr);
else
#endif
tcphoff = ip_hdrlen(skb);
/* csum_check requires unshared skb */
if (!skb_make_writable(skb, tcphoff+sizeof(*tcph)))
@ -137,7 +154,7 @@ tcp_snat_handler(struct sk_buff *skb,
if (unlikely(cp->app != NULL)) {
/* Some checks before mangling */
if (pp->csum_check && !pp->csum_check(AF_INET, skb, pp))
if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
return 0;
/* Call application helper if needed */
@ -145,13 +162,13 @@ tcp_snat_handler(struct sk_buff *skb,
return 0;
}
tcph = (void *)ip_hdr(skb) + tcphoff;
tcph = (void *)skb_network_header(skb) + tcphoff;
tcph->source = cp->vport;
/* Adjust TCP checksums */
if (!cp->app) {
/* Only port and addr are changed, do fast csum update */
tcp_fast_csum_update(tcph, cp->daddr.ip, cp->vaddr.ip,
tcp_fast_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr,
cp->dport, cp->vport);
if (skb->ip_summed == CHECKSUM_COMPLETE)
skb->ip_summed = CHECKSUM_NONE;
@ -159,9 +176,20 @@ tcp_snat_handler(struct sk_buff *skb,
/* full checksum calculation */
tcph->check = 0;
skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
tcph->check = csum_tcpudp_magic(cp->vaddr.ip, cp->caddr.ip,
skb->len - tcphoff,
cp->protocol, skb->csum);
#ifdef CONFIG_IP_VS_IPV6
if (cp->af == AF_INET6)
tcph->check = csum_ipv6_magic(&cp->vaddr.in6,
&cp->caddr.in6,
skb->len - tcphoff,
cp->protocol, skb->csum);
else
#endif
tcph->check = csum_tcpudp_magic(cp->vaddr.ip,
cp->caddr.ip,
skb->len - tcphoff,
cp->protocol,
skb->csum);
IP_VS_DBG(11, "O-pkt: %s O-csum=%d (+%zd)\n",
pp->name, tcph->check,
(char*)&(tcph->check) - (char*)tcph);
@ -175,7 +203,14 @@ tcp_dnat_handler(struct sk_buff *skb,
struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
{
struct tcphdr *tcph;
const unsigned int tcphoff = ip_hdrlen(skb);
unsigned int tcphoff;
#ifdef CONFIG_IP_VS_IPV6
if (cp->af == AF_INET6)
tcphoff = sizeof(struct ipv6hdr);
else
#endif
tcphoff = ip_hdrlen(skb);
/* csum_check requires unshared skb */
if (!skb_make_writable(skb, tcphoff+sizeof(*tcph)))
@ -183,7 +218,7 @@ tcp_dnat_handler(struct sk_buff *skb,
if (unlikely(cp->app != NULL)) {
/* Some checks before mangling */
if (pp->csum_check && !pp->csum_check(AF_INET, skb, pp))
if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
return 0;
/*
@ -194,7 +229,7 @@ tcp_dnat_handler(struct sk_buff *skb,
return 0;
}
tcph = (void *)ip_hdr(skb) + tcphoff;
tcph = (void *)skb_network_header(skb) + tcphoff;
tcph->dest = cp->dport;
/*
@ -202,7 +237,7 @@ tcp_dnat_handler(struct sk_buff *skb,
*/
if (!cp->app) {
/* Only port and addr are changed, do fast csum update */
tcp_fast_csum_update(tcph, cp->vaddr.ip, cp->daddr.ip,
tcp_fast_csum_update(cp->af, tcph, &cp->vaddr, &cp->daddr,
cp->vport, cp->dport);
if (skb->ip_summed == CHECKSUM_COMPLETE)
skb->ip_summed = CHECKSUM_NONE;
@ -210,9 +245,19 @@ tcp_dnat_handler(struct sk_buff *skb,
/* full checksum calculation */
tcph->check = 0;
skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
tcph->check = csum_tcpudp_magic(cp->caddr.ip, cp->daddr.ip,
skb->len - tcphoff,
cp->protocol, skb->csum);
#ifdef CONFIG_IP_VS_IPV6
if (cp->af == AF_INET6)
tcph->check = csum_ipv6_magic(&cp->caddr.in6,
&cp->daddr.in6,
skb->len - tcphoff,
cp->protocol, skb->csum);
else
#endif
tcph->check = csum_tcpudp_magic(cp->caddr.ip,
cp->daddr.ip,
skb->len - tcphoff,
cp->protocol,
skb->csum);
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
return 1;
@ -487,7 +532,13 @@ tcp_state_transition(struct ip_vs_conn *cp, int direction,
{
struct tcphdr _tcph, *th;
th = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_tcph), &_tcph);
#ifdef CONFIG_IP_VS_IPV6
int ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr);
#else
int ihl = ip_hdrlen(skb);
#endif
th = skb_header_pointer(skb, ihl, sizeof(_tcph), &_tcph);
if (th == NULL)
return 0;

82
net/ipv4/ipvs/ip_vs_proto_udp.c
View File

@ -120,13 +120,23 @@ udp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,
static inline void
udp_fast_csum_update(struct udphdr *uhdr, __be32 oldip, __be32 newip,
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)
{
uhdr->check =
csum_fold(ip_vs_check_diff4(oldip, newip,
ip_vs_check_diff2(oldport, newport,
~csum_unfold(uhdr->check))));
#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;
}
@ -136,7 +146,14 @@ udp_snat_handler(struct sk_buff *skb,
struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
{
struct udphdr *udph;
const unsigned int udphoff = ip_hdrlen(skb);
unsigned int udphoff;
#ifdef CONFIG_IP_VS_IPV6
if (cp->af == AF_INET6)
udphoff = sizeof(struct ipv6hdr);
else
#endif
udphoff = ip_hdrlen(skb);
/* csum_check requires unshared skb */
if (!skb_make_writable(skb, udphoff+sizeof(*udph)))
@ -144,7 +161,7 @@ udp_snat_handler(struct sk_buff *skb,
if (unlikely(cp->app != NULL)) {
/* Some checks before mangling */
if (pp->csum_check && !pp->csum_check(AF_INET, skb, pp))
if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
return 0;
/*
@ -154,7 +171,7 @@ udp_snat_handler(struct sk_buff *skb,
return 0;
}
udph = (void *)ip_hdr(skb) + udphoff;
udph = (void *)skb_network_header(skb) + udphoff;
udph->source = cp->vport;
/*
@ -162,7 +179,7 @@ udp_snat_handler(struct sk_buff *skb,
*/
if (!cp->app && (udph->check != 0)) {
/* Only port and addr are changed, do fast csum update */
udp_fast_csum_update(udph, cp->daddr.ip, cp->vaddr.ip,
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;
@ -170,9 +187,19 @@ udp_snat_handler(struct sk_buff *skb,
/* full checksum calculation */
udph->check = 0;
skb->csum = skb_checksum(skb, udphoff, skb->len - udphoff, 0);
udph->check = csum_tcpudp_magic(cp->vaddr.ip, cp->caddr.ip,
skb->len - udphoff,
cp->protocol, skb->csum);
#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",
@ -188,7 +215,14 @@ udp_dnat_handler(struct sk_buff *skb,
struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
{
struct udphdr *udph;
unsigned int udphoff = ip_hdrlen(skb);
unsigned int udphoff;
#ifdef CONFIG_IP_VS_IPV6
if (cp->af == AF_INET6)
udphoff = sizeof(struct ipv6hdr);
else
#endif
udphoff = ip_hdrlen(skb);
/* csum_check requires unshared skb */
if (!skb_make_writable(skb, udphoff+sizeof(*udph)))
@ -196,7 +230,7 @@ udp_dnat_handler(struct sk_buff *skb,
if (unlikely(cp->app != NULL)) {
/* Some checks before mangling */
if (pp->csum_check && !pp->csum_check(AF_INET, skb, pp))
if (pp->csum_check && !pp->csum_check(cp->af, skb, pp))
return 0;
/*
@ -207,7 +241,7 @@ udp_dnat_handler(struct sk_buff *skb,
return 0;
}
udph = (void *)ip_hdr(skb) + udphoff;
udph = (void *)skb_network_header(skb) + udphoff;
udph->dest = cp->dport;
/*
@ -215,7 +249,7 @@ udp_dnat_handler(struct sk_buff *skb,
*/
if (!cp->app && (udph->check != 0)) {
/* Only port and addr are changed, do fast csum update */
udp_fast_csum_update(udph, cp->vaddr.ip, cp->daddr.ip,
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;
@ -223,9 +257,19 @@ udp_dnat_handler(struct sk_buff *skb,
/* full checksum calculation */
udph->check = 0;
skb->csum = skb_checksum(skb, udphoff, skb->len - udphoff, 0);
udph->check = csum_tcpudp_magic(cp->caddr.ip, cp->daddr.ip,
skb->len - udphoff,
cp->protocol, skb->csum);
#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;