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Diffstat (limited to 'net/ipv4/ipvs/ip_vs_proto_icmp.c')
-rw-r--r--net/ipv4/ipvs/ip_vs_proto_icmp.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/net/ipv4/ipvs/ip_vs_proto_icmp.c b/net/ipv4/ipvs/ip_vs_proto_icmp.c
new file mode 100644
index 0000000..191e94a
--- /dev/null
+++ b/net/ipv4/ipvs/ip_vs_proto_icmp.c
@@ -0,0 +1,182 @@
+/*
+ * ip_vs_proto_icmp.c: ICMP load balancing support for IP Virtual Server
+ *
+ * Authors: Julian Anastasov <ja@ssi.bg>, March 2002
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation;
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/icmp.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+
+#include <net/ip_vs.h>
+
+
+static int icmp_timeouts[1] = { 1*60*HZ };
+
+static char * icmp_state_name_table[1] = { "ICMP" };
+
+static struct ip_vs_conn *
+icmp_conn_in_get(const struct sk_buff *skb,
+ struct ip_vs_protocol *pp,
+ const struct iphdr *iph,
+ unsigned int proto_off,
+ int inverse)
+{
+#if 0
+ struct ip_vs_conn *cp;
+
+ if (likely(!inverse)) {
+ cp = ip_vs_conn_in_get(iph->protocol,
+ iph->saddr, 0,
+ iph->daddr, 0);
+ } else {
+ cp = ip_vs_conn_in_get(iph->protocol,
+ iph->daddr, 0,
+ iph->saddr, 0);
+ }
+
+ return cp;
+
+#else
+ return NULL;
+#endif
+}
+
+static struct ip_vs_conn *
+icmp_conn_out_get(const struct sk_buff *skb,
+ struct ip_vs_protocol *pp,
+ const struct iphdr *iph,
+ unsigned int proto_off,
+ int inverse)
+{
+#if 0
+ struct ip_vs_conn *cp;
+
+ if (likely(!inverse)) {
+ cp = ip_vs_conn_out_get(iph->protocol,
+ iph->saddr, 0,
+ iph->daddr, 0);
+ } else {
+ cp = ip_vs_conn_out_get(IPPROTO_UDP,
+ iph->daddr, 0,
+ iph->saddr, 0);
+ }
+
+ return cp;
+#else
+ return NULL;
+#endif
+}
+
+static int
+icmp_conn_schedule(struct sk_buff *skb, struct ip_vs_protocol *pp,
+ int *verdict, struct ip_vs_conn **cpp)
+{
+ *verdict = NF_ACCEPT;
+ return 0;
+}
+
+static int
+icmp_csum_check(struct sk_buff *skb, struct ip_vs_protocol *pp)
+{
+ if (!(skb->nh.iph->frag_off & __constant_htons(IP_OFFSET))) {
+ if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
+ if (ip_vs_checksum_complete(skb, skb->nh.iph->ihl * 4)) {
+ IP_VS_DBG_RL_PKT(0, pp, skb, 0, "Failed checksum for");
+ return 0;
+ }
+ }
+ }
+ return 1;
+}
+
+static void
+icmp_debug_packet(struct ip_vs_protocol *pp,
+ const struct sk_buff *skb,
+ int offset,
+ const char *msg)
+{
+ char buf[256];
+ struct iphdr _iph, *ih;
+
+ ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
+ if (ih == NULL)
+ sprintf(buf, "%s TRUNCATED", pp->name);
+ else if (ih->frag_off & __constant_htons(IP_OFFSET))
+ sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u frag",
+ pp->name, NIPQUAD(ih->saddr),
+ NIPQUAD(ih->daddr));
+ else {
+ struct icmphdr _icmph, *ic;
+
+ ic = skb_header_pointer(skb, offset + ih->ihl*4,
+ sizeof(_icmph), &_icmph);
+ if (ic == NULL)
+ sprintf(buf, "%s TRUNCATED to %u bytes\n",
+ pp->name, skb->len - offset);
+ else
+ sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u T:%d C:%d",
+ pp->name, NIPQUAD(ih->saddr),
+ NIPQUAD(ih->daddr),
+ ic->type, ic->code);
+ }
+ printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf);
+}
+
+static int
+icmp_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_ICMP_S_NORMAL];
+ return 1;
+}
+
+static int
+icmp_set_state_timeout(struct ip_vs_protocol *pp, char *sname, int to)
+{
+ int num;
+ char **names;
+
+ num = IP_VS_ICMP_S_LAST;
+ names = icmp_state_name_table;
+ return ip_vs_set_state_timeout(pp->timeout_table, num, names, sname, to);
+}
+
+
+static void icmp_init(struct ip_vs_protocol *pp)
+{
+ pp->timeout_table = icmp_timeouts;
+}
+
+static void icmp_exit(struct ip_vs_protocol *pp)
+{
+}
+
+struct ip_vs_protocol ip_vs_protocol_icmp = {
+ .name = "ICMP",
+ .protocol = IPPROTO_ICMP,
+ .dont_defrag = 0,
+ .init = icmp_init,
+ .exit = icmp_exit,
+ .conn_schedule = icmp_conn_schedule,
+ .conn_in_get = icmp_conn_in_get,
+ .conn_out_get = icmp_conn_out_get,
+ .snat_handler = NULL,
+ .dnat_handler = NULL,
+ .csum_check = icmp_csum_check,
+ .state_transition = icmp_state_transition,
+ .register_app = NULL,
+ .unregister_app = NULL,
+ .app_conn_bind = NULL,
+ .debug_packet = icmp_debug_packet,
+ .timeout_change = NULL,
+ .set_state_timeout = icmp_set_state_timeout,
+};
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