2 * ip_vs_proto_icmp.c: ICMP load balancing support for IP Virtual Server
4 * Authors: Julian Anastasov <ja@ssi.bg>, March 2002
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation;
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/icmp.h>
15 #include <linux/netfilter.h>
16 #include <linux/netfilter_ipv4.h>
18 #include <net/ip_vs.h>
21 static int icmp_timeouts[1] = { 1*60*HZ };
23 static char * icmp_state_name_table[1] = { "ICMP" };
26 icmp_conn_in_get(const struct sk_buff *skb,
27 struct ip_vs_protocol *pp,
28 const struct iphdr *iph,
29 unsigned int proto_off,
33 struct ip_vs_conn *cp;
35 if (likely(!inverse)) {
36 cp = ip_vs_conn_in_get(iph->protocol,
40 cp = ip_vs_conn_in_get(iph->protocol,
53 icmp_conn_out_get(const struct sk_buff *skb,
54 struct ip_vs_protocol *pp,
55 const struct iphdr *iph,
56 unsigned int proto_off,
60 struct ip_vs_conn *cp;
62 if (likely(!inverse)) {
63 cp = ip_vs_conn_out_get(iph->protocol,
67 cp = ip_vs_conn_out_get(IPPROTO_UDP,
79 icmp_conn_schedule(struct sk_buff *skb, struct ip_vs_protocol *pp,
80 int *verdict, struct ip_vs_conn **cpp)
87 icmp_csum_check(struct sk_buff *skb, struct ip_vs_protocol *pp)
89 if (!(skb->nh.iph->frag_off & __constant_htons(IP_OFFSET))) {
90 if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
91 if (ip_vs_checksum_complete(skb, skb->nh.iph->ihl * 4)) {
92 IP_VS_DBG_RL_PKT(0, pp, skb, 0, "Failed checksum for");
101 icmp_debug_packet(struct ip_vs_protocol *pp,
102 const struct sk_buff *skb,
108 struct icmphdr icmph;
110 if (skb_copy_bits(skb, offset, &iph, sizeof(iph)) < 0)
111 sprintf(buf, "%s TRUNCATED", pp->name);
112 else if (iph.frag_off & __constant_htons(IP_OFFSET))
113 sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u frag",
114 pp->name, NIPQUAD(iph.saddr),
116 else if (skb_copy_bits(skb, offset + iph.ihl*4, &icmph, sizeof(icmph)) < 0)
117 sprintf(buf, "%s TRUNCATED to %u bytes\n",
118 pp->name, skb->len - offset);
120 sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u T:%d C:%d",
121 pp->name, NIPQUAD(iph.saddr),
123 icmph.type, icmph.code);
125 printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf);
129 icmp_state_transition(struct ip_vs_conn *cp, int direction,
130 const struct sk_buff *skb,
131 struct ip_vs_protocol *pp)
133 cp->timeout = pp->timeout_table[IP_VS_ICMP_S_NORMAL];
138 icmp_set_state_timeout(struct ip_vs_protocol *pp, char *sname, int to)
143 num = IP_VS_ICMP_S_LAST;
144 names = icmp_state_name_table;
145 return ip_vs_set_state_timeout(pp->timeout_table, num, names, sname, to);
149 static void icmp_init(struct ip_vs_protocol *pp)
151 pp->timeout_table = icmp_timeouts;
154 static void icmp_exit(struct ip_vs_protocol *pp)
158 struct ip_vs_protocol ip_vs_protocol_icmp = {
160 .protocol = IPPROTO_ICMP,
164 .conn_schedule = icmp_conn_schedule,
165 .conn_in_get = icmp_conn_in_get,
166 .conn_out_get = icmp_conn_out_get,
167 .snat_handler = NULL,
168 .dnat_handler = NULL,
169 .csum_check = icmp_csum_check,
170 .state_transition = icmp_state_transition,
171 .register_app = NULL,
172 .unregister_app = NULL,
173 .app_conn_bind = NULL,
174 .debug_packet = icmp_debug_packet,
175 .timeout_change = NULL,
176 .set_state_timeout = icmp_set_state_timeout,