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Date: Wed, 11 Jun 2008 19:11:53 +0200
From: "Julius R. Volz" <juliusv@...gle.com>
To: lvs-devel@...r.kernel.org, netdev@...r.kernel.org
Cc: horms@...ge.net.au, davem@...emloft.net, vbusam@...gle.com,
"Julius R. Volz" <juliusv@...gle.com>
Subject: [PATCH 10/26] IPVS: Add IPv6 handler functions to UDP protocol handler.
Define new IPv6-specific handler functions in UDP protocol handler. Set new
function pointers in ip_vs_protocol struct to point to these functions.
Signed-off-by: Julius R. Volz <juliusv@...gle.com>
1 files changed, 264 insertions(+), 1 deletions(-)
diff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c
index 76e97ef..ef0d921 100644
--- a/net/netfilter/ipvs/ip_vs_proto_udp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_udp.c
@@ -49,6 +49,31 @@ udp_conn_in_get(const struct sk_buff *skb, struct ip_vs_protocol *pp,
return cp;
}
+#ifdef CONFIG_IP_VS_IPV6
+static struct ip_vs_conn *
+udp_conn_in_get_v6(const struct sk_buff *skb, struct ip_vs_protocol *pp,
+ const struct ipv6hdr *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_v6(iph->nexthdr,
+ &iph->saddr, pptr[0],
+ &iph->daddr, pptr[1]);
+ } else {
+ cp = ip_vs_conn_in_get_v6(iph->nexthdr,
+ &iph->daddr, pptr[1],
+ &iph->saddr, pptr[0]);
+ }
+
+ return cp;
+}
+#endif
static struct ip_vs_conn *
udp_conn_out_get(const struct sk_buff *skb, struct ip_vs_protocol *pp,
@@ -75,6 +100,33 @@ udp_conn_out_get(const struct sk_buff *skb, struct ip_vs_protocol *pp,
return cp;
}
+#ifdef CONFIG_IP_VS_IPV6
+static struct ip_vs_conn *
+udp_conn_out_get_v6(const struct sk_buff *skb, struct ip_vs_protocol *pp,
+ const struct ipv6hdr *iph, unsigned int proto_off, int inverse)
+{
+ struct ip_vs_conn *cp;
+ __be16 _ports[2], *pptr;
+
+ pptr = skb_header_pointer(skb, sizeof(struct ipv6hdr),
+ sizeof(_ports), _ports);
+ if (pptr == NULL)
+ return NULL;
+
+ if (likely(!inverse)) {
+ cp = ip_vs_conn_out_get_v6(iph->nexthdr,
+ &iph->saddr, pptr[0],
+ &iph->daddr, pptr[1]);
+ } else {
+ cp = ip_vs_conn_out_get_v6(iph->nexthdr,
+ &iph->daddr, pptr[1],
+ &iph->saddr, pptr[0]);
+ }
+
+ return cp;
+}
+#endif
+
static int
udp_conn_schedule(struct sk_buff *skb, struct ip_vs_protocol *pp,
@@ -116,6 +168,48 @@ udp_conn_schedule(struct sk_buff *skb, struct ip_vs_protocol *pp,
return 1;
}
+#ifdef CONFIG_IP_VS_IPV6
+static int
+udp_conn_schedule_v6(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;
+
+ uh = skb_header_pointer(skb, sizeof(struct ipv6hdr),
+ sizeof(_udph), &_udph);
+ if (uh == NULL) {
+ *verdict = NF_DROP;
+ return 0;
+ }
+
+ if ((svc = ip_vs_service_get_v6(skb->mark, ipv6_hdr(skb)->nexthdr,
+ &ipv6_hdr(skb)->daddr, uh->dest))) {
+ 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_v6(svc, skb);
+ if (!*cpp) {
+ *verdict = ip_vs_leave_v6(svc, skb, pp);
+ return 0;
+ }
+ ip_vs_service_put(svc);
+ }
+ return 1;
+}
+#endif
+
static inline void
udp_fast_csum_update(struct udphdr *uhdr, __be32 oldip, __be32 newip,
@@ -129,6 +223,21 @@ udp_fast_csum_update(struct udphdr *uhdr, __be32 oldip, __be32 newip,
uhdr->check = CSUM_MANGLED_0;
}
+#ifdef CONFIG_IP_VS_IPV6
+static inline void
+udp_fast_csum_update_v6(struct udphdr *uhdr, const struct in6_addr *oldip,
+ const struct in6_addr *newip, __be16 oldport,
+ __be16 newport)
+{
+ uhdr->check =
+ csum_fold(ip_vs_check_diff16(oldip->s6_addr32, newip->s6_addr32,
+ ip_vs_check_diff2(oldport, newport,
+ ~csum_unfold(uhdr->check))));
+ if (!uhdr->check)
+ uhdr->check = CSUM_MANGLED_0;
+}
+#endif
+
static int
udp_snat_handler(struct sk_buff *skb,
struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
@@ -180,6 +289,59 @@ udp_snat_handler(struct sk_buff *skb,
return 1;
}
+#ifdef CONFIG_IP_VS_IPV6
+static int
+udp_snat_handler_v6(struct sk_buff *skb,
+ struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
+{
+ struct udphdr *udph;
+ const unsigned int udphoff = sizeof(struct ipv6hdr);
+
+ /* 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_v6 && !pp->csum_check_v6(skb, pp))
+ return 0;
+
+ /*
+ * Call application helper if needed
+ */
+ if (!ip_vs_app_pkt_out(cp, skb))
+ return 0;
+ }
+
+ udph = (void *)ipv6_hdr(skb) + udphoff;
+ udph->source = cp->vport;
+
+ /*
+ * Adjust UDP checksums
+ */
+ if (!cp->app && (udph->check != 0)) {
+ /* Only port and addr are changed, do fast csum update */
+ udp_fast_csum_update_v6(udph, &cp->daddr.v6, &cp->vaddr.v6,
+ 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);
+ udph->check = csum_ipv6_magic(&cp->vaddr.v6, &cp->caddr.v6,
+ 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;
+}
+#endif
+
static int
udp_dnat_handler(struct sk_buff *skb,
@@ -231,6 +393,58 @@ udp_dnat_handler(struct sk_buff *skb,
return 1;
}
+#ifdef CONFIG_IP_VS_IPV6
+static int
+udp_dnat_handler_v6(struct sk_buff *skb,
+ struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
+{
+ struct udphdr *udph;
+ unsigned int udphoff = sizeof(struct ipv6hdr);
+
+ /* 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_v6 && !pp->csum_check_v6(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 *)ipv6_hdr(skb) + udphoff;
+ udph->dest = cp->dport;
+
+ /*
+ * Adjust UDP checksums
+ */
+ if (!cp->app && (udph->check != 0)) {
+ /* Only port and addr are changed, do fast csum update */
+ udp_fast_csum_update_v6(udph, &cp->vaddr.v6, &cp->daddr.v6,
+ 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);
+ udph->check = csum_ipv6_magic(&cp->caddr.v6, &cp->daddr.v6,
+ skb->len - udphoff,
+ cp->protocol, skb->csum);
+ if (udph->check == 0)
+ udph->check = CSUM_MANGLED_0;
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ return 1;
+}
+#endif
+
static int
udp_csum_check(struct sk_buff *skb, struct ip_vs_protocol *pp)
@@ -266,6 +480,42 @@ udp_csum_check(struct sk_buff *skb, struct ip_vs_protocol *pp)
return 1;
}
+#ifdef CONFIG_IP_VS_IPV6
+static int
+udp_csum_check_v6(struct sk_buff *skb, struct ip_vs_protocol *pp)
+{
+ struct udphdr _udph, *uh;
+ const unsigned int udphoff = sizeof(struct ipv6hdr);
+
+ 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:
+ 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;
+ }
+ break;
+ default:
+ /* No need to checksum. */
+ break;
+ }
+ }
+ return 1;
+}
+#endif
+
/*
* Note: the caller guarantees that only one of register_app,
@@ -413,7 +663,6 @@ static void udp_exit(struct ip_vs_protocol *pp)
{
}
-
struct ip_vs_protocol ip_vs_protocol_udp = {
.name = "UDP",
.protocol = IPPROTO_UDP,
@@ -422,11 +671,25 @@ struct ip_vs_protocol ip_vs_protocol_udp = {
.init = udp_init,
.exit = udp_exit,
.conn_schedule = udp_conn_schedule,
+#ifdef CONFIG_IP_VS_IPV6
+ .conn_schedule_v6 = udp_conn_schedule_v6,
+#endif
.conn_in_get = udp_conn_in_get,
.conn_out_get = udp_conn_out_get,
+#ifdef CONFIG_IP_VS_IPV6
+ .conn_in_get_v6 = udp_conn_in_get_v6,
+ .conn_out_get_v6 = udp_conn_out_get_v6,
+#endif
.snat_handler = udp_snat_handler,
.dnat_handler = udp_dnat_handler,
+#ifdef CONFIG_IP_VS_IPV6
+ .snat_handler_v6 = udp_snat_handler_v6,
+ .dnat_handler_v6 = udp_dnat_handler_v6,
+#endif
.csum_check = udp_csum_check,
+#ifdef CONFIG_IP_VS_IPV6
+ .csum_check_v6 = udp_csum_check_v6,
+#endif
.state_transition = udp_state_transition,
.state_name = udp_state_name,
.register_app = udp_register_app,
--
1.5.3.6
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