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[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [net/] [ipv4/] [ipip.c] - Rev 199
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/* * Linux NET3: IP/IP protocol decoder. * * Authors: * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 * * Fixes: * Alan Cox : Merged and made usable non modular (its so tiny its silly as * a module taking up 2 pages). * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph) * to keep ip_forward happy. * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8). * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #include <linux/module.h> #include <linux/types.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/skbuff.h> #include <linux/netdevice.h> #include <linux/in.h> #include <linux/tcp.h> #include <linux/udp.h> #include <linux/firewall.h> #include <net/datalink.h> #include <net/sock.h> #include <net/ip.h> #include <net/icmp.h> #include <net/protocol.h> #include <net/ipip.h> /* * The IPIP protocol driver. * * On entry here * skb->data is the original IP header * skb->ip_hdr points to the initial IP header. * skb->h.raw points at the new header. */ int ipip_rcv(struct sk_buff *skb, struct device *dev, struct options *opt, __u32 daddr, unsigned short len, __u32 saddr, int redo, struct inet_protocol *protocol) { /* Don't unlink in the middle of a turnaround */ MOD_INC_USE_COUNT; #ifdef TUNNEL_DEBUG printk("ipip_rcv: got a packet!\n"); #endif /* * Discard the original IP header */ skb->mac.raw = skb->data; skb_pull(skb, ((struct iphdr *)skb->data)->ihl<<2); /* * Adjust pointers */ skb->h.iph=(struct iphdr *)skb->data; skb->ip_hdr=(struct iphdr *)skb->data; memset(skb->proto_priv, 0, sizeof(struct options)); /* * If you want to add LZ compressed IP or things like that here, * and in drivers/net/tunnel.c are the places to add. */ skb->protocol = htons(ETH_P_IP); skb->ip_summed = 0; netif_rx(skb); MOD_DEC_USE_COUNT; return(0); } #ifdef MODULE static struct inet_protocol ipip_protocol = { ipip_rcv, /* IPIP handler */ #if 0 NULL, /* Will be UDP fraglist handler */ #endif NULL, /* TUNNEL error control */ 0, /* next */ IPPROTO_IPIP, /* protocol ID */ 0, /* copy */ NULL, /* data */ "IPIP" /* name */ }; /* * And now the modules code and kernel interface. */ int init_module( void) { inet_add_protocol(&ipip_protocol); return 0; } void cleanup_module( void) { if ( inet_del_protocol(&ipip_protocol) < 0 ) printk(KERN_INFO "ipip close: can't remove protocol\n"); } #endif
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