?? ip_vs_proto_icmp.c
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/* * 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" };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}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 inticmp_conn_schedule(struct sk_buff *skb, struct ip_vs_protocol *pp, int *verdict, struct ip_vs_conn **cpp){ *verdict = NF_ACCEPT; return 0;}static inticmp_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 voidicmp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, int offset, const char *msg){ char buf[256]; struct iphdr iph; struct icmphdr icmph; if (skb_copy_bits(skb, offset, &iph, sizeof(iph)) < 0) sprintf(buf, "%s TRUNCATED", pp->name); else if (iph.frag_off & __constant_htons(IP_OFFSET)) sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u frag", pp->name, NIPQUAD(iph.saddr), NIPQUAD(iph.daddr)); else if (skb_copy_bits(skb, offset + iph.ihl*4, &icmph, sizeof(icmph)) < 0) 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(iph.saddr), NIPQUAD(iph.daddr), icmph.type, icmph.code); printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf);}static inticmp_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 inticmp_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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