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Define new IPv6-specific handler functions in TCP protocol handler. Set new
function pointers in ip_vs_protocol struct to point to these functions.
Introduce new ip_vs_check_diff16() function for recalculating IPv6 address
checksums.
Signed-off-by: Julius R. Volz <juliusv@xxxxxxxxxx>
2 files changed, 260 insertions(+), 1 deletions(-)
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 9ae04d0..a6e7438 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -1094,6 +1094,17 @@ 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 };
diff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c
b/net/netfilter/ipvs/ip_vs_proto_tcp.c
index 0efb3e4..02bf859 100644
--- a/net/netfilter/ipvs/ip_vs_proto_tcp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c
@@ -47,6 +47,29 @@ tcp_conn_in_get(const struct sk_buff *skb, struct
ip_vs_protocol *pp,
}
}
+#ifdef CONFIG_IP_VS_IPV6
+static struct ip_vs_conn *
+tcp_conn_in_get_v6(const struct sk_buff *skb, struct ip_vs_protocol *pp,
+ const struct ipv6hdr *iph, unsigned int proto_off, int inverse)
+{
+ __be16 _ports[2], *pptr;
+
+ pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports);
+ if (pptr == NULL)
+ return NULL;
+
+ if (likely(!inverse)) {
+ return ip_vs_conn_in_get_v6(iph->nexthdr,
+ &iph->saddr, pptr[0],
+ &iph->daddr, pptr[1]);
+ } else {
+ return ip_vs_conn_in_get_v6(iph->nexthdr,
+ &iph->daddr, pptr[1],
+ &iph->saddr, pptr[0]);
+ }
+}
+#endif
+
static struct ip_vs_conn *
tcp_conn_out_get(const struct sk_buff *skb, struct ip_vs_protocol *pp,
const struct iphdr *iph, unsigned int proto_off, int inverse)
@@ -68,6 +91,29 @@ tcp_conn_out_get(const struct sk_buff *skb, struct
ip_vs_protocol *pp,
}
}
+#ifdef CONFIG_IP_VS_IPV6
+static struct ip_vs_conn *
+tcp_conn_out_get_v6(const struct sk_buff *skb, struct ip_vs_protocol *pp,
+ const struct ipv6hdr *iph, unsigned int proto_off, int inverse)
+{
+ __be16 _ports[2], *pptr;
+
+ pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports);
+ if (pptr == NULL)
+ return NULL;
+
+ if (likely(!inverse)) {
+ return ip_vs_conn_out_get_v6(iph->nexthdr,
+ &iph->saddr, pptr[0],
+ &iph->daddr, pptr[1]);
+ } else {
+ return ip_vs_conn_out_get_v6(iph->nexthdr,
+ &iph->daddr, pptr[1],
+ &iph->saddr, pptr[0]);
+ }
+}
+#endif
+
static int
tcp_conn_schedule(struct sk_buff *skb,
@@ -110,6 +156,50 @@ tcp_conn_schedule(struct sk_buff *skb,
return 1;
}
+#ifdef CONFIG_IP_VS_IPV6
+static int
+tcp_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 tcphdr _tcph, *th;
+
+ th = skb_header_pointer(skb, sizeof(struct ipv6hdr), sizeof(_tcph),
+ &_tcph);
+ if (th == NULL) {
+ *verdict = NF_DROP;
+ return 0;
+ }
+
+ if (th->syn &&
+ (svc = ip_vs_service_get_v6(skb->mark, ipv6_hdr(skb)->nexthdr,
+ &ipv6_hdr(skb)->daddr, th->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
tcp_fast_csum_update(struct tcphdr *tcph, __be32 oldip, __be32 newip,
@@ -121,6 +211,19 @@ tcp_fast_csum_update(struct tcphdr *tcph, __be32 oldip,
__be32 newip,
~csum_unfold(tcph->check))));
}
+#ifdef CONFIG_IP_VS_IPV6
+static inline void
+tcp_fast_csum_update_v6(struct tcphdr *tcph, const struct in6_addr *oldip,
+ const struct in6_addr *newip, __be16 oldport,
+ __be16 newport)
+{
+ tcph->check =
+ csum_fold(ip_vs_check_diff16(oldip->s6_addr32, newip->s6_addr32,
+ ip_vs_check_diff2(oldport, newport,
+ ~csum_unfold(tcph->check))));
+}
+#endif
+
static int
tcp_snat_handler(struct sk_buff *skb,
@@ -167,6 +270,53 @@ tcp_snat_handler(struct sk_buff *skb,
return 1;
}
+#ifdef CONFIG_IP_VS_IPV6
+static int
+tcp_snat_handler_v6(struct sk_buff *skb,
+ struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
+{
+ struct tcphdr *tcph;
+ const unsigned int tcphoff = sizeof(struct ipv6hdr);
+
+ /* csum_check_v6 requires unshared skb */
+ if (!skb_make_writable(skb, tcphoff+sizeof(*tcph)))
+ 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;
+ }
+
+ tcph = (void *)ipv6_hdr(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_v6(tcph, &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 */
+ tcph->check = 0;
+ skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
+ tcph->check = csum_ipv6_magic(&cp->vaddr.v6, &cp->caddr.v6,
+ 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);
+ }
+ return 1;
+}
+#endif
+
static int
tcp_dnat_handler(struct sk_buff *skb,
@@ -216,6 +366,56 @@ tcp_dnat_handler(struct sk_buff *skb,
return 1;
}
+#ifdef CONFIG_IP_VS_IPV6
+static int
+tcp_dnat_handler_v6(struct sk_buff *skb,
+ struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
+{
+ struct tcphdr *tcph;
+ const unsigned int tcphoff = sizeof(struct ipv6hdr);
+
+ /* csum_check_v6 requires unshared skb */
+ if (!skb_make_writable(skb, tcphoff+sizeof(*tcph)))
+ 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 and iph ack_seq stuff
+ */
+ if (!ip_vs_app_pkt_in(cp, skb))
+ return 0;
+ }
+
+ tcph = (void *)ipv6_hdr(skb) + tcphoff;
+ tcph->dest = cp->dport;
+
+ /*
+ * Adjust TCP checksums
+ */
+ if (!cp->app) {
+ /* Only port and addr are changed, do fast csum update */
+ tcp_fast_csum_update_v6(tcph, &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 */
+ tcph->check = 0;
+ skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
+ tcph->check = csum_ipv6_magic(&cp->caddr.v6, &cp->daddr.v6,
+ skb->len - tcphoff,
+ cp->protocol, skb->csum);
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ return 1;
+}
+#endif
+
static int
tcp_csum_check(struct sk_buff *skb, struct ip_vs_protocol *pp)
@@ -242,6 +442,35 @@ tcp_csum_check(struct sk_buff *skb, struct ip_vs_protocol
*pp)
return 1;
}
+#ifdef CONFIG_IP_VS_IPV6
+static int
+tcp_csum_check_v6(struct sk_buff *skb, struct ip_vs_protocol *pp)
+{
+ const unsigned int tcphoff = sizeof(struct ipv6hdr);
+ return 1;
+
+ switch (skb->ip_summed) {
+ case CHECKSUM_NONE:
+ skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
+ case CHECKSUM_COMPLETE:
+ if (csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ skb->len - tcphoff,
+ 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
+
#define TCP_DIR_INPUT 0
#define TCP_DIR_OUTPUT 4
@@ -477,8 +706,13 @@ tcp_state_transition(struct ip_vs_conn *cp, int direction,
struct ip_vs_protocol *pp)
{
struct tcphdr _tcph, *th;
+#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, ip_hdrlen(skb), sizeof(_tcph), &_tcph);
+ th = skb_header_pointer(skb, ihl, sizeof(_tcph), &_tcph);
if (th == NULL)
return 0;
@@ -625,11 +859,25 @@ struct ip_vs_protocol ip_vs_protocol_tcp = {
.register_app = tcp_register_app,
.unregister_app = tcp_unregister_app,
.conn_schedule = tcp_conn_schedule,
+#ifdef CONFIG_IP_VS_IPV6
+ .conn_schedule_v6 = tcp_conn_schedule_v6,
+#endif
.conn_in_get = tcp_conn_in_get,
.conn_out_get = tcp_conn_out_get,
+#ifdef CONFIG_IP_VS_IPV6
+ .conn_in_get_v6 = tcp_conn_in_get_v6,
+ .conn_out_get_v6 = tcp_conn_out_get_v6,
+#endif
.snat_handler = tcp_snat_handler,
.dnat_handler = tcp_dnat_handler,
+#ifdef CONFIG_IP_VS_IPV6
+ .snat_handler_v6 = tcp_snat_handler_v6,
+ .dnat_handler_v6 = tcp_dnat_handler_v6,
+#endif
.csum_check = tcp_csum_check,
+#ifdef CONFIG_IP_VS_IPV6
+ .csum_check_v6 = tcp_csum_check_v6,
+#endif
.state_name = tcp_state_name,
.state_transition = tcp_state_transition,
.app_conn_bind = tcp_app_conn_bind,
--
1.5.3.6
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