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ipvs: load balance ipv6 connections from a local process

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This allows IPVS to load balance IPv6 connections made by a local process.
For example a proxy server running locally.

External client --> pound:443 -> Local:443 --> IPVS:80 --> RealServer

This is an extenstion to the IPv4 work done in this area
by Siim Põder and Malcolm Turnbull.

Cc: Siim Põder <siim@p6drad-teel.net>
Cc: Malcolm Turnbull <malcolm@loadbalancer.org>
Signed-off-by: Simon Horman <horms@verge.net.au>
This commit is contained in:
Simon Horman 2008-09-05 11:17:14 +10:00
parent 4856c84c13
commit f2428ed5e7
1 changed files with 41 additions and 50 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

91
net/ipv4/ipvs/ip_vs_core.c
View file

@ -654,8 +654,9 @@ void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
/* Handle relevant response ICMP messages - forward to the right
* destination host. Used for NAT and local client.
*/
static int handle_response_icmp(struct sk_buff *skb, struct iphdr *iph,
struct iphdr *cih, struct ip_vs_conn *cp,
static int handle_response_icmp(int af, struct sk_buff *skb,
union nf_inet_addr *snet,
__u8 protocol, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp,
unsigned int offset, unsigned int ihl)
{
@ -669,18 +670,22 @@ static int handle_response_icmp(struct sk_buff *skb, struct iphdr *iph,
/* Ensure the checksum is correct */
if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {
/* Failed checksum! */
IP_VS_DBG(1,
"Forward ICMP: failed checksum from %d.%d.%d.%d!\n",
NIPQUAD(iph->saddr));
IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n",
IP_VS_DBG_ADDR(af, snet));
goto out;
}
if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol)
if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol)
offset += 2 * sizeof(__u16);
if (!skb_make_writable(skb, offset))
goto out;
ip_vs_nat_icmp(skb, pp, cp, 1);
#ifdef CONFIG_IP_VS_IPV6
if (af == AF_INET6)
ip_vs_nat_icmp_v6(skb, pp, cp, 1);
else
#endif
ip_vs_nat_icmp(skb, pp, cp, 1);
/* do the statistics and put it back */
ip_vs_out_stats(cp, skb);
@ -708,6 +713,7 @@ static int ip_vs_out_icmp(struct sk_buff *skb, int *related)
struct ip_vs_conn *cp;
struct ip_vs_protocol *pp;
unsigned int offset, ihl;
union nf_inet_addr snet;
*related = 1;
@ -766,7 +772,9 @@ static int ip_vs_out_icmp(struct sk_buff *skb, int *related)
if (!cp)
return NF_ACCEPT;
return handle_response_icmp(skb, iph, cih, cp, pp, offset, ihl);
snet.ip = iph->saddr;
return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp,
pp, offset, ihl);
}
#ifdef CONFIG_IP_VS_IPV6
@ -779,7 +787,8 @@ static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related)
struct ip_vs_iphdr ciph;
struct ip_vs_conn *cp;
struct ip_vs_protocol *pp;
unsigned int offset, verdict;
unsigned int offset;
union nf_inet_addr snet;
*related = 1;
@ -838,40 +847,9 @@ static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related)
if (!cp)
return NF_ACCEPT;
verdict = NF_DROP;
if (IP_VS_FWD_METHOD(cp) != 0) {
IP_VS_ERR("shouldn't reach here, because the box is on the "
"half connection in the tun/dr module.\n");
}
/* Ensure the checksum is correct */
if (!skb_csum_unnecessary(skb)
&& ip_vs_checksum_complete(skb, sizeof(struct ipv6hdr))) {
/* Failed checksum! */
IP_VS_DBG(1, "Forward ICMPv6: failed checksum from "
NIP6_FMT "!\n",
NIP6(iph->saddr));
goto out;
}
if (IPPROTO_TCP == cih->nexthdr || IPPROTO_UDP == cih->nexthdr)
offset += 2 * sizeof(__u16);
if (!skb_make_writable(skb, offset))
goto out;
ip_vs_nat_icmp_v6(skb, pp, cp, 1);
/* do the statistics and put it back */
ip_vs_out_stats(cp, skb);
skb->ipvs_property = 1;
verdict = NF_ACCEPT;
out:
__ip_vs_conn_put(cp);
return verdict;
snet.in6 = iph->saddr;
return handle_response_icmp(AF_INET6, skb, &snet, cih->nexthdr, cp,
pp, offset, sizeof(struct ipv6hdr));
}
#endif
@ -1055,7 +1033,7 @@ ip_vs_out(unsigned int hooknum, struct sk_buff *skb,
ICMP_DEST_UNREACH,
ICMP_PORT_UNREACH, 0);
return NF_DROP;
}
}
}
}
IP_VS_DBG_PKT(12, pp, skb, 0,
@ -1083,6 +1061,7 @@ ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum)
struct ip_vs_conn *cp;
struct ip_vs_protocol *pp;
unsigned int offset, ihl, verdict;
union nf_inet_addr snet;
*related = 1;
@ -1142,9 +1121,12 @@ ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum)
if (!cp) {
/* The packet could also belong to a local client */
cp = pp->conn_out_get(AF_INET, skb, pp, &ciph, offset, 1);
if (cp)
return handle_response_icmp(skb, iph, cih, cp, pp,
if (cp) {
snet.ip = iph->saddr;
return handle_response_icmp(AF_INET, skb, &snet,
cih->protocol, cp, pp,
offset, ihl);
}
return NF_ACCEPT;
}
@ -1183,6 +1165,7 @@ ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, unsigned int hooknum)
struct ip_vs_conn *cp;
struct ip_vs_protocol *pp;
unsigned int offset, verdict;
union nf_inet_addr snet;
*related = 1;
@ -1240,8 +1223,18 @@ ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, unsigned int hooknum)
ip_vs_fill_iphdr(AF_INET6, cih, &ciph);
/* The embedded headers contain source and dest in reverse order */
cp = pp->conn_in_get(AF_INET6, skb, pp, &ciph, offset, 1);
if (!cp)
if (!cp) {
/* The packet could also belong to a local client */
cp = pp->conn_out_get(AF_INET6, skb, pp, &ciph, offset, 1);
if (cp) {
snet.in6 = iph->saddr;
return handle_response_icmp(AF_INET6, skb, &snet,
cih->nexthdr,
cp, pp, offset,
sizeof(struct ipv6hdr));
}
return NF_ACCEPT;
}
verdict = NF_DROP;
@ -1281,9 +1274,7 @@ ip_vs_in(unsigned int hooknum, struct sk_buff *skb,
* Big tappo: only PACKET_HOST, including loopback for local client
* Don't handle local packets on IPv6 for now
*/
if (unlikely(skb->pkt_type != PACKET_HOST ||
(af == AF_INET6 || (skb->dev->flags & IFF_LOOPBACK ||
skb->sk)))) {
if (unlikely(skb->pkt_type != PACKET_HOST)) {
IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s ignored\n",
skb->pkt_type,
iph.protocol,