From db9a26cbd125ec106e040ea6084911f9bc0c0198 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Fri, 4 Feb 2000 06:32:39 +0000 Subject: 2000-02-03 Roland McGrath Complete overhaul of pfinet based on the IPv4 networking code from the Linux 2.2.12 kernel sources. This page describes a single unified set of interdependent changes, but there are so many changes that I have broken up the log entry into paragraphs based on rough topical divisions of the work involved. Subset of verbatim Linux 2.2.12 sources imported on a vendor branch. * linux-src: New directory, see README for details. * README: New file, describes linux-src layout and procedures for tracking Linux source updates. Light modifications to linux-src files to avoid really bending over backwards with the glue macros. All modifications to files in linux-src are conditionalized by #ifdef _HURD_. * linux-src/include/linux/net.h [_HURD_] (struct socket): New members refcnt and identity; elide members fasync_list, file. * linux-src/include/linux/rtnetlink.h [! CONFIG_RTNETLINK] (rtnl_shlock, rtnl_shunlock) [! _HURD_]: Conditionalize contents on this, making these no-ops #ifdef _HURD_. * linux-src/net/core/dev.c [_HURD_] (dev_ioctl): Don't define the function, instead #define it to 0. * linux-src/net/ipv4/af_inet.c [_HURD_] (inet_ioctl): Likewise. * linux-src/net/ipv4/arp.c [_HURD_] (arp_ioctl): Likewise. * linux-src/net/ipv4/udp.c [_HURD_] (udp_ioctl): Likewise. * linux-src/net/ipv4/tcp.c [_HURD_] (tcp_ioctl): Likewise. [_HURD_] (tcp_tiocinq): New function, TIOCINQ code from tcp_ioctl. * linux-src/net/ipv4/devinet.c [_HURD_] (devinet_ioctl): Don't define the function, instead #define it to 0. [_HURD_] (configure_device): New function, cobbled from SIOCSIFADDR and SIOCSIFNETMASK code from devinet_ioctl. * glue-include/asm, glue-include/linux: New directories. These contain glue kludge headers that replace all of the Linux headers except checksum.h, and several of the Linux headers (the remainder come from linux-src/include/linux and are mostly unmodified). * glue-include/asm/atomic.h: New file, glue replacement header. * glue-include/asm/bitops.h: New file, glue replacement header. * glue-include/asm/byteorder.h: New file, glue replacement header. * glue-include/asm/checksum.h: New file, glue replacement header. * glue-include/asm/errno.h: New file, glue replacement header. * glue-include/asm/hardirq.h: New file, glue replacement header. * glue-include/asm/init.h: New file, glue replacement header. * glue-include/asm/segment.h: New file, glue replacement header. * glue-include/asm/spinlock.h: New file, glue replacement header. * glue-include/asm/system.h: New file, glue replacement header. * glue-include/asm/types.h: New file, glue replacement header. * glue-include/asm/uaccess.h: New file, glue replacement header. * glue-include/linux/autoconf.h: New file, glue replacement header. * glue-include/linux/binfmts.h: New file, glue replacement header. * glue-include/linux/config.h: New file, glue replacement header. * glue-include/linux/errno.h: New file, glue replacement header. * glue-include/linux/fcntl.h: New file, glue replacement header. * glue-include/linux/fs.h: New file, glue replacement header. * glue-include/linux/in.h: New file, glue replacement header. * glue-include/linux/in6.h: New file, glue replacement header. * glue-include/linux/interrupt.h: New file, glue replacement header. * glue-include/linux/ioctl.h: New file, glue replacement header. * glue-include/linux/ipv6.h: New file, glue replacement header. * glue-include/linux/kernel.h: New file, glue replacement header. * glue-include/linux/limits.h: New file, glue replacement header. * glue-include/linux/major.h: New file, glue replacement header. * glue-include/linux/malloc.h: New file, glue replacement header. * glue-include/linux/mm.h: New file, glue replacement header. * glue-include/linux/param.h: New file, glue replacement header. * glue-include/linux/personality.h: New file, glue replacement header. * glue-include/linux/poll.h: New file, glue replacement header. * glue-include/linux/proc_fs.h: New file, glue replacement header. * glue-include/linux/sched.h: New file, glue replacement header. * glue-include/linux/slab.h: New file, glue replacement header. * glue-include/linux/socket.h: New file, glue replacement header. * glue-include/linux/sockios.h: New file, glue replacement header. * glue-include/linux/stat.h: New file, glue replacement header. * glue-include/linux/string.h: New file, glue replacement header. * glue-include/linux/termios.h: New file, glue replacement header. * glue-include/linux/time.h: New file, glue replacement header. * glue-include/linux/timer.h: New file, glue replacement header. * glue-include/linux/timex.h: New file, glue replacement header. * glue-include/linux/types.h: New file, glue replacement header. * glue-include/linux/un.h: New file, glue replacement header. * glue-include/linux/version.h: New file, glue replacement header. * glue-include/linux/wait.h: New file, glue replacement header. * kmem_cache.c: New file. Glue code replaces Linux kmem_cache_t et al. * stubs.c: New file. No-op functions and stub variables for a few things the Linux networking code needs to link. * Makefile (core-srcs, arch-lib-srcs, ethernet-srcs, ipv4-srcs): New variables, listing sources used from linux-src subdirectories. (LINUXSRCS): Define using those. (SRCS): Remove devices.c; add kmem_cache.c, stubs.c. (UNUSEDSRC): Variable removed. (vpath %.c): Remove vpath for $(srcdir)/linux-inet directory. Add vpaths for $(srcdir)/linux-src subdirectories. (CPPFLAGS): Add -D_HURD_SYSTYPE defining it to $(asm_syntax) as a double-quoted string. Add -I's for glue-include and linux-src/include. * pfinet.h: Include , and not . (master_device): Remove decl. (global_lock, packet_queue_lock): Remove common defns. (global_lock, net_bh_lock): Declare them as externs. (struct sockaddr): Remove len member, make address member just a struct sockaddr rather than a 0-length array. (setup_loopback_device, become_task_protid, become_task): Remove decls. (ethernet_initialize): Declare it. (input_work_thread): Remove decl. (net_bh_thread): Declare it. (tcp_readable): Remove decl. (tcp_tiocinq): Declare it. * config.h: Rewritten based on Linux 2.2.12 set of CONFIG_* options. (CONFIG_NET, CONFIG_INET, CONFIG_SKB_LARGE): These are the only Linux config options we set. (CONFIG_IP_NOSIOCRT): New macro (not a proper config option, but used conveniently in the code). * ethernet.c (ethernet_set_multi): Take only one parameter. Remove assert, since we always get passed IGMP_ALL_HOSTS. (ethernet_thread): Make static. (ethernet_demuxer): Use __mutex_lock in place of mutex_lock, so as to get cthreads instead of linux/spinlock.h glue macros. Lock net_bh_lock instead of global_lock. Set SKB->protocol with eth_type_trans before calling netif_rx. (ethernet_initialize): New function, one-time initialization broken out of ethernet_open. (ethernet_open): Ports setup moved to ethernet_initialize. Don't use `errno' to avoid glue conflicts. Use get_privileged_ports here to get the master device port, and deallocate it after calling device_open. (ethernet_xmit): Use assert_perror. Only one arg to dev_kfree_skb now. (setup_ethernet_device): Change initializations for structure changes. Call dev_init_buffers and register_netdevice on the device. * timer-emul.c (all functions): Use __mutex_lock instead of mutex_lock. Adjust for renaming of `prevp' member to `prev' in struct timer_list. (mod_timer): New function. * socket.c (proto_ops): Variable removed. (net_families): New variable replaces it. (sock_register): Rewritten for new calling convention, set net_families rather than proto_ops. (make_sock_user, clean_socketport, sock_alloc, sock_release): Functions moved here from misc.c. * sched.c (packet_queue_lock): Variable removed. (net_bh_lock, net_bh_wakeup): New variables. (current): Variable removed (now a macro in the glue headers). (interruptible_sleep_on, wake_up_interruptible): Functions removed. They are replaced by inlines in the glue headers. (become_task, become_task_protid): Functions removed; they are replaced by macros in glue-include/linux/sched.h. (net_bh_worker): New function. * loopback.c: Completely rewritten, mostly copied from linux-2.2.12's drivers/net/loopback.c source file. * io-ops.c (all functions): Use __mutex_lock in place of mutex_lock. (S_io_write): Call ops->sendmsg instead of ops->write, which no longer exists. If O_NONBLOCK is set, set MSG_DONTWAIT in msg_flags. (S_io_read): Call ops->recvmsg instead of ops->read, which no longer exists If O_NONBLOCK is set, pass MSG_DONTWAIT. (S_io_readable): Use USER->sock->data in place of USER->sock->sk. For SOCK_STREAM and SOCK_SEQPACKET types, call tcp_tiocinq. (S_io_set_all_openmodes, S_io_get_openmodes, S_io_set_some_openmodes, S_io_clear_some_openmodes): Member USER->sock->userflags is now renamed USER->sock->flags. (S_io_select): Completely rewritten using ops->poll. (select_wait): Function removed. (S_io_stat): Set st_mode to reflect S_IFSOCK. * socket-ops.c (all functions): Use __mutex_lock instead of mutex_lock. (S_socket_create): Don't set SOCK->ops or call SOCK->ops->create. Instead, call net_families[PF_INET]->create. (S_socket_listen): Remove extra checks; just call ops->listen. (S_socket_accept): Remove extra checks before ops->accept call. Avoid use of goto. (S_socket_connect): Remove extra checks; just call ops->connect. (S_socket_bind): Adjust for struct sock_addr changes. (S_socket_create_address): Likewise. (S_socket_whatis_address): Likewise. (S_socket_connect2): Don't diddle data structures after ops->socketpair call. (S_socket_getopt): Use sock_getsockopt if LEVEL is SOL_SOCKET. Accept any data size, not just sizeof (int). (S_socket_setopt): Use sock_setsockopt if LEVEL is SOL_SOCKET. (S_socket_send): Always use ops->sendmsg instead of ops->send or ops->sendto, which no longer exist. If O_NONBLOCK is set, set MSG_DONTWAIT in msg_flags. (S_socket_recv): Always use ops->recvmsg instead of ops->recv, which no longer exists. If O_NONBLOCK is set, set MSG_DONTWAIT in flags. Check for error from S_socket_create_address. * main.c (find_device): Don't try to set ether_dev.pa_mask (it's gone). (main): Don't call init_devices. Call ethernet_initialize. Start net_bh_worker instead of input_work_thread. Don't call setup_loopback_device. Instead, take global_lock, do prepare_current, and then call sk_init, skb_init, inet_proto_init, and net_dev_init. Keep global_lock held while calling argp_parse. Call arrange_shutdown_notification only after all that. Fix error call for "contacting parent" to pass ERR instead of errno. * options.c (ADDR): #undef before defining macro. (parse_opt): #if 0 out EDESTADDRREQ check (I don't understand it). To apply settings, call configure_devices. (ADD_ADDR_OPT): #if 0 --address and --netmask options. Needs fixed. * misc.c (make_sock_user, clean_socketport, sock_alloc, sock_release): Functions moved to socket.c. (sock_release_peer): Function removed. (make_sockaddr_port): Use struct sockaddr_storage to size buffer. Fix size calculation for new struct sock_addr layout. Initialize sa_family and sa_len of new struct sock_addr. Remove the old Linux (2.0.??) network stack and the glue code for it. * linux-inet, asm, linux: Directories and all files removed. Some of the new files in glue-include came from the old glue headers in the asm and linux directories, but most were substantially modified. * devices.c: File removed. The equivalent glue is now elsewhere. --- pfinet/linux-inet/icmp.c | 774 ----------------------------------------------- 1 file changed, 774 deletions(-) delete mode 100644 pfinet/linux-inet/icmp.c (limited to 'pfinet/linux-inet/icmp.c') diff --git a/pfinet/linux-inet/icmp.c b/pfinet/linux-inet/icmp.c deleted file mode 100644 index c023eab2..00000000 --- a/pfinet/linux-inet/icmp.c +++ /dev/null @@ -1,774 +0,0 @@ -/* - * INET An implementation of the TCP/IP protocol suite for the LINUX - * operating system. INET is implemented using the BSD Socket - * interface as the means of communication with the user level. - * - * Internet Control Message Protocol (ICMP) - * - * Version: @(#)icmp.c 1.0.11 06/02/93 - * - * Authors: Ross Biro, - * Fred N. van Kempen, - * Mark Evans, - * Alan Cox, - * Stefan Becker, - * - * Fixes: - * Alan Cox : Generic queue usage. - * Gerhard Koerting: ICMP addressing corrected - * Alan Cox : Use tos/ttl settings - * Alan Cox : Protocol violations - * Alan Cox : SNMP Statistics - * Alan Cox : Routing errors - * Alan Cox : Changes for newer routing code - * Alan Cox : Removed old debugging junk - * Alan Cox : Fixed the ICMP error status of net/host unreachable - * Gerhard Koerting : Fixed broadcast ping properly - * Ulrich Kunitz : Fixed ICMP timestamp reply - * A.N.Kuznetsov : Multihoming fixes. - * Laco Rusnak : Multihoming fixes. - * Alan Cox : Tightened up icmp_send(). - * Alan Cox : Multicasts. - * Stefan Becker : ICMP redirects in icmp_send(). - * - * - * - * 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include "snmp.h" -#include "ip.h" -#include "route.h" -#include "protocol.h" -#include "icmp.h" -#include "tcp.h" -#include "snmp.h" -#include -#include "sock.h" -#include -#include -#include -#include - - -#define min(a,b) ((a)<(b)?(a):(b)) - - -/* - * Statistics - */ - -struct icmp_mib icmp_statistics={0,}; - - -/* An array of errno for error messages from dest unreach. */ -struct icmp_err icmp_err_convert[] = { - { ENETUNREACH, 0 }, /* ICMP_NET_UNREACH */ - { EHOSTUNREACH, 0 }, /* ICMP_HOST_UNREACH */ - { ENOPROTOOPT, 1 }, /* ICMP_PROT_UNREACH */ - { ECONNREFUSED, 1 }, /* ICMP_PORT_UNREACH */ - { EOPNOTSUPP, 0 }, /* ICMP_FRAG_NEEDED */ - { EOPNOTSUPP, 0 }, /* ICMP_SR_FAILED */ - { ENETUNREACH, 1 }, /* ICMP_NET_UNKNOWN */ - { EHOSTDOWN, 1 }, /* ICMP_HOST_UNKNOWN */ - { ENONET, 1 }, /* ICMP_HOST_ISOLATED */ - { ENETUNREACH, 1 }, /* ICMP_NET_ANO */ - { EHOSTUNREACH, 1 }, /* ICMP_HOST_ANO */ - { EOPNOTSUPP, 0 }, /* ICMP_NET_UNR_TOS */ - { EOPNOTSUPP, 0 } /* ICMP_HOST_UNR_TOS */ -}; - - -/* - * Send an ICMP message in response to a situation - * - * Fixme: Fragment handling is wrong really. - */ - -void icmp_send(struct sk_buff *skb_in, int type, int code, unsigned long info, struct device *dev) -{ - struct sk_buff *skb; - struct iphdr *iph; - int offset; - struct icmphdr *icmph; - int len; - struct device *ndev=NULL; /* Make this =dev to force replies on the same interface */ - unsigned long our_addr; - int atype; - - /* - * Find the original IP header. - */ - - iph = (struct iphdr *) (skb_in->data + dev->hard_header_len); - - /* - * No replies to MAC multicast - */ - - if(skb_in->pkt_type!=PACKET_HOST) - return; - - /* - * No replies to IP multicasting - */ - - atype=ip_chk_addr(iph->daddr); - if(atype==IS_BROADCAST || IN_MULTICAST(iph->daddr)) - return; - - /* - * Only reply to first fragment. - */ - - if(ntohs(iph->frag_off)&IP_OFFSET) - return; - - /* - * We must NEVER NEVER send an ICMP error to an ICMP error message - */ - - if(type==ICMP_DEST_UNREACH||type==ICMP_REDIRECT||type==ICMP_SOURCE_QUENCH||type==ICMP_TIME_EXCEEDED) - { - - /* - * Is the original packet an ICMP packet? - */ - - if(iph->protocol==IPPROTO_ICMP) - { - icmph = (struct icmphdr *) ((char *) iph + - 4 * iph->ihl); - /* - * Check for ICMP error packets (Must never reply to - * an ICMP error). - */ - - if (icmph->type == ICMP_DEST_UNREACH || - icmph->type == ICMP_SOURCE_QUENCH || - icmph->type == ICMP_REDIRECT || - icmph->type == ICMP_TIME_EXCEEDED || - icmph->type == ICMP_PARAMETERPROB) - return; - } - } - icmp_statistics.IcmpOutMsgs++; - - /* - * This needs a tidy. - */ - - switch(type) - { - case ICMP_DEST_UNREACH: - icmp_statistics.IcmpOutDestUnreachs++; - break; - case ICMP_SOURCE_QUENCH: - icmp_statistics.IcmpOutSrcQuenchs++; - break; - case ICMP_REDIRECT: - icmp_statistics.IcmpOutRedirects++; - break; - case ICMP_ECHO: - icmp_statistics.IcmpOutEchos++; - break; - case ICMP_ECHOREPLY: - icmp_statistics.IcmpOutEchoReps++; - break; - case ICMP_TIME_EXCEEDED: - icmp_statistics.IcmpOutTimeExcds++; - break; - case ICMP_PARAMETERPROB: - icmp_statistics.IcmpOutParmProbs++; - break; - case ICMP_TIMESTAMP: - icmp_statistics.IcmpOutTimestamps++; - break; - case ICMP_TIMESTAMPREPLY: - icmp_statistics.IcmpOutTimestampReps++; - break; - case ICMP_ADDRESS: - icmp_statistics.IcmpOutAddrMasks++; - break; - case ICMP_ADDRESSREPLY: - icmp_statistics.IcmpOutAddrMaskReps++; - break; - } - /* - * Get some memory for the reply. - */ - - len = dev->hard_header_len + sizeof(struct iphdr) + sizeof(struct icmphdr) + - sizeof(struct iphdr) + 32; /* amount of header to return */ - - skb = (struct sk_buff *) alloc_skb(len, GFP_ATOMIC); - if (skb == NULL) - { - icmp_statistics.IcmpOutErrors++; - return; - } - skb->free = 1; - - /* - * Build Layer 2-3 headers for message back to source. - */ - - our_addr = dev->pa_addr; - if (iph->daddr != our_addr && ip_chk_addr(iph->daddr) == IS_MYADDR) - our_addr = iph->daddr; - offset = ip_build_header(skb, our_addr, iph->saddr, - &ndev, IPPROTO_ICMP, NULL, len, - skb_in->ip_hdr->tos,255); - if (offset < 0) - { - icmp_statistics.IcmpOutErrors++; - skb->sk = NULL; - kfree_skb(skb, FREE_READ); - return; - } - - /* - * Re-adjust length according to actual IP header size. - */ - - skb->len = offset + sizeof(struct icmphdr) + sizeof(struct iphdr) + 8; - - /* - * Fill in the frame - */ - - icmph = (struct icmphdr *) (skb->data + offset); - icmph->type = type; - icmph->code = code; - icmph->checksum = 0; - icmph->un.gateway = info; /* This might not be meant for - this form of the union but it will - be right anyway */ - memcpy(icmph + 1, iph, sizeof(struct iphdr) + 8); - - icmph->checksum = ip_compute_csum((unsigned char *)icmph, - sizeof(struct icmphdr) + sizeof(struct iphdr) + 8); - - /* - * Send it and free it once sent. - */ - ip_queue_xmit(NULL, ndev, skb, 1); -} - - -/* - * Handle ICMP_UNREACH and ICMP_QUENCH. - */ - -static void icmp_unreach(struct icmphdr *icmph, struct sk_buff *skb) -{ - struct inet_protocol *ipprot; - struct iphdr *iph; - unsigned char hash; - int err; - - err = (icmph->type << 8) | icmph->code; - iph = (struct iphdr *) (icmph + 1); - - switch(icmph->code & 7) - { - case ICMP_NET_UNREACH: - break; - case ICMP_HOST_UNREACH: - break; - case ICMP_PROT_UNREACH: - printk("ICMP: %s:%d: protocol unreachable.\n", - in_ntoa(iph->daddr), ntohs(iph->protocol)); - break; - case ICMP_PORT_UNREACH: - break; - case ICMP_FRAG_NEEDED: - printk("ICMP: %s: fragmentation needed and DF set.\n", - in_ntoa(iph->daddr)); - break; - case ICMP_SR_FAILED: - printk("ICMP: %s: Source Route Failed.\n", in_ntoa(iph->daddr)); - break; - default: - break; - } - - /* - * Get the protocol(s). - */ - - hash = iph->protocol & (MAX_INET_PROTOS -1); - - /* - * This can't change while we are doing it. - */ - - ipprot = (struct inet_protocol *) inet_protos[hash]; - while(ipprot != NULL) - { - struct inet_protocol *nextip; - - nextip = (struct inet_protocol *) ipprot->next; - - /* - * Pass it off to everyone who wants it. - */ - if (iph->protocol == ipprot->protocol && ipprot->err_handler) - { - ipprot->err_handler(err, (unsigned char *)(icmph + 1), - iph->daddr, iph->saddr, ipprot); - } - - ipprot = nextip; - } - kfree_skb(skb, FREE_READ); -} - - -/* - * Handle ICMP_REDIRECT. - */ - -static void icmp_redirect(struct icmphdr *icmph, struct sk_buff *skb, - struct device *dev, unsigned long source) -{ - struct rtable *rt; - struct iphdr *iph; - unsigned long ip; - - /* - * Get the copied header of the packet that caused the redirect - */ - - iph = (struct iphdr *) (icmph + 1); - ip = iph->daddr; - - switch(icmph->code & 7) - { - case ICMP_REDIR_NET: - /* - * This causes a problem with subnetted networks. What we should do - * is use ICMP_ADDRESS to get the subnet mask of the problem route - * and set both. But we don't.. - */ -#ifdef not_a_good_idea - ip_rt_add((RTF_DYNAMIC | RTF_MODIFIED | RTF_GATEWAY), - ip, 0, icmph->un.gateway, dev,0, 0); - break; -#endif - case ICMP_REDIR_HOST: - /* - * Add better route to host. - * But first check that the redirect - * comes from the old gateway.. - * And make sure it's an ok host address - * (not some confused thing sending our - * address) - */ - rt = ip_rt_route(ip, NULL, NULL); - if (!rt) - break; - if (rt->rt_gateway != source || ip_chk_addr(icmph->un.gateway)) - break; - printk("redirect from %s\n", in_ntoa(source)); - ip_rt_add((RTF_DYNAMIC | RTF_MODIFIED | RTF_HOST | RTF_GATEWAY), - ip, 0, icmph->un.gateway, dev,0, 0); - break; - case ICMP_REDIR_NETTOS: - case ICMP_REDIR_HOSTTOS: - printk("ICMP: cannot handle TOS redirects yet!\n"); - break; - default: - break; - } - - /* - * Discard the original packet - */ - - kfree_skb(skb, FREE_READ); -} - - -/* - * Handle ICMP_ECHO ("ping") requests. - */ - -static void icmp_echo(struct icmphdr *icmph, struct sk_buff *skb, struct device *dev, - unsigned long saddr, unsigned long daddr, int len, - struct options *opt) -{ - struct icmphdr *icmphr; - struct sk_buff *skb2; - struct device *ndev=NULL; - int size, offset; - - icmp_statistics.IcmpOutEchoReps++; - icmp_statistics.IcmpOutMsgs++; - - size = dev->hard_header_len + 64 + len; - skb2 = alloc_skb(size, GFP_ATOMIC); - - if (skb2 == NULL) - { - icmp_statistics.IcmpOutErrors++; - kfree_skb(skb, FREE_READ); - return; - } - skb2->free = 1; - - /* Build Layer 2-3 headers for message back to source */ - offset = ip_build_header(skb2, daddr, saddr, &ndev, - IPPROTO_ICMP, opt, len, skb->ip_hdr->tos,255); - if (offset < 0) - { - icmp_statistics.IcmpOutErrors++; - printk("ICMP: Could not build IP Header for ICMP ECHO Response\n"); - kfree_skb(skb2,FREE_WRITE); - kfree_skb(skb, FREE_READ); - return; - } - - /* - * Re-adjust length according to actual IP header size. - */ - - skb2->len = offset + len; - - /* - * Build ICMP_ECHO Response message. - */ - icmphr = (struct icmphdr *) (skb2->data + offset); - memcpy((char *) icmphr, (char *) icmph, len); - icmphr->type = ICMP_ECHOREPLY; - icmphr->code = 0; - icmphr->checksum = 0; - icmphr->checksum = ip_compute_csum((unsigned char *)icmphr, len); - - /* - * Ship it out - free it when done - */ - ip_queue_xmit((struct sock *)NULL, ndev, skb2, 1); - - /* - * Free the received frame - */ - - kfree_skb(skb, FREE_READ); -} - -/* - * Handle ICMP Timestamp requests. - */ - -static void icmp_timestamp(struct icmphdr *icmph, struct sk_buff *skb, struct device *dev, - unsigned long saddr, unsigned long daddr, int len, - struct options *opt) -{ - struct icmphdr *icmphr; - struct sk_buff *skb2; - int size, offset; - unsigned long *timeptr, midtime; - struct device *ndev=NULL; - - if (len != 20) - { - printk( - "ICMP: Size (%d) of ICMP_TIMESTAMP request should be 20!\n", - len); - icmp_statistics.IcmpInErrors++; -#if 1 - /* correct answers are possible for everything >= 12 */ - if (len < 12) -#endif - return; - } - - size = dev->hard_header_len + 84; - - if (! (skb2 = alloc_skb(size, GFP_ATOMIC))) - { - skb->sk = NULL; - kfree_skb(skb, FREE_READ); - icmp_statistics.IcmpOutErrors++; - return; - } - skb2->free = 1; - -/* - * Build Layer 2-3 headers for message back to source - */ - - offset = ip_build_header(skb2, daddr, saddr, &ndev, IPPROTO_ICMP, opt, len, - skb->ip_hdr->tos, 255); - if (offset < 0) - { - printk("ICMP: Could not build IP Header for ICMP TIMESTAMP Response\n"); - kfree_skb(skb2, FREE_WRITE); - kfree_skb(skb, FREE_READ); - icmp_statistics.IcmpOutErrors++; - return; - } - - /* - * Re-adjust length according to actual IP header size. - */ - skb2->len = offset + 20; - - /* - * Build ICMP_TIMESTAMP Response message. - */ - - icmphr = (struct icmphdr *) ((char *) (skb2 + 1) + offset); - memcpy((char *) icmphr, (char *) icmph, 12); - icmphr->type = ICMP_TIMESTAMPREPLY; - icmphr->code = icmphr->checksum = 0; - - /* fill in the current time as ms since midnight UT: */ - midtime = (xtime.tv_sec % 86400) * 1000 + xtime.tv_usec / 1000; - timeptr = (unsigned long *) (icmphr + 1); - /* - * the originate timestamp (timeptr [0]) is still in the copy: - */ - timeptr [1] = timeptr [2] = htonl(midtime); - - icmphr->checksum = ip_compute_csum((unsigned char *) icmphr, 20); - - /* - * Ship it out - free it when done - */ - - ip_queue_xmit((struct sock *) NULL, ndev, skb2, 1); - icmp_statistics.IcmpOutTimestampReps++; - kfree_skb(skb, FREE_READ); -} - - - - -/* - * Handle the ICMP INFORMATION REQUEST. - */ - -static void icmp_info(struct icmphdr *icmph, struct sk_buff *skb, struct device *dev, - unsigned long saddr, unsigned long daddr, int len, - struct options *opt) -{ - /* Obsolete */ - kfree_skb(skb, FREE_READ); -} - - -/* - * Handle ICMP_ADDRESS_MASK requests. - */ - -static void icmp_address(struct icmphdr *icmph, struct sk_buff *skb, struct device *dev, - unsigned long saddr, unsigned long daddr, int len, - struct options *opt) -{ - struct icmphdr *icmphr; - struct sk_buff *skb2; - int size, offset; - struct device *ndev=NULL; - - icmp_statistics.IcmpOutMsgs++; - icmp_statistics.IcmpOutAddrMaskReps++; - - size = dev->hard_header_len + 64 + len; - skb2 = alloc_skb(size, GFP_ATOMIC); - if (skb2 == NULL) - { - icmp_statistics.IcmpOutErrors++; - kfree_skb(skb, FREE_READ); - return; - } - skb2->free = 1; - - /* - * Build Layer 2-3 headers for message back to source - */ - - offset = ip_build_header(skb2, daddr, saddr, &ndev, - IPPROTO_ICMP, opt, len, skb->ip_hdr->tos,255); - if (offset < 0) - { - icmp_statistics.IcmpOutErrors++; - printk("ICMP: Could not build IP Header for ICMP ADDRESS Response\n"); - kfree_skb(skb2,FREE_WRITE); - kfree_skb(skb, FREE_READ); - return; - } - - /* - * Re-adjust length according to actual IP header size. - */ - - skb2->len = offset + len; - - /* - * Build ICMP ADDRESS MASK Response message. - */ - - icmphr = (struct icmphdr *) (skb2->data + offset); - icmphr->type = ICMP_ADDRESSREPLY; - icmphr->code = 0; - icmphr->checksum = 0; - icmphr->un.echo.id = icmph->un.echo.id; - icmphr->un.echo.sequence = icmph->un.echo.sequence; - memcpy((char *) (icmphr + 1), (char *) &dev->pa_mask, sizeof(dev->pa_mask)); - - icmphr->checksum = ip_compute_csum((unsigned char *)icmphr, len); - - /* Ship it out - free it when done */ - ip_queue_xmit((struct sock *)NULL, ndev, skb2, 1); - - skb->sk = NULL; - kfree_skb(skb, FREE_READ); -} - - -/* - * Deal with incoming ICMP packets. - */ - -int icmp_rcv(struct sk_buff *skb1, struct device *dev, struct options *opt, - unsigned long daddr, unsigned short len, - unsigned long saddr, int redo, struct inet_protocol *protocol) -{ - struct icmphdr *icmph; - unsigned char *buff; - - /* - * Drop broadcast packets. IP has done a broadcast check and ought one day - * to pass on that information. - */ - - icmp_statistics.IcmpInMsgs++; - - - /* - * Grab the packet as an icmp object - */ - - buff = skb1->h.raw; - icmph = (struct icmphdr *) buff; - - /* - * Validate the packet first - */ - - if (ip_compute_csum((unsigned char *) icmph, len)) - { - /* Failed checksum! */ - icmp_statistics.IcmpInErrors++; - printk("ICMP: failed checksum from %s!\n", in_ntoa(saddr)); - kfree_skb(skb1, FREE_READ); - return(0); - } - - /* - * Parse the ICMP message - */ - - if (ip_chk_addr(daddr) != IS_MYADDR) - { - if (icmph->type != ICMP_ECHO) - { - icmp_statistics.IcmpInErrors++; - kfree_skb(skb1, FREE_READ); - return(0); - } - daddr=dev->pa_addr; - } - - switch(icmph->type) - { - case ICMP_TIME_EXCEEDED: - icmp_statistics.IcmpInTimeExcds++; - icmp_unreach(icmph, skb1); - return 0; - case ICMP_DEST_UNREACH: - icmp_statistics.IcmpInDestUnreachs++; - icmp_unreach(icmph, skb1); - return 0; - case ICMP_SOURCE_QUENCH: - icmp_statistics.IcmpInSrcQuenchs++; - icmp_unreach(icmph, skb1); - return(0); - case ICMP_REDIRECT: - icmp_statistics.IcmpInRedirects++; - icmp_redirect(icmph, skb1, dev, saddr); - return(0); - case ICMP_ECHO: - icmp_statistics.IcmpInEchos++; - icmp_echo(icmph, skb1, dev, saddr, daddr, len, opt); - return 0; - case ICMP_ECHOREPLY: - icmp_statistics.IcmpInEchoReps++; - kfree_skb(skb1, FREE_READ); - return(0); - case ICMP_TIMESTAMP: - icmp_statistics.IcmpInTimestamps++; - icmp_timestamp(icmph, skb1, dev, saddr, daddr, len, opt); - return 0; - case ICMP_TIMESTAMPREPLY: - icmp_statistics.IcmpInTimestampReps++; - kfree_skb(skb1,FREE_READ); - return 0; - /* INFO is obsolete and doesn't even feature in the SNMP stats */ - case ICMP_INFO_REQUEST: - icmp_info(icmph, skb1, dev, saddr, daddr, len, opt); - return 0; - case ICMP_INFO_REPLY: - skb1->sk = NULL; - kfree_skb(skb1, FREE_READ); - return(0); - case ICMP_ADDRESS: - icmp_statistics.IcmpInAddrMasks++; - icmp_address(icmph, skb1, dev, saddr, daddr, len, opt); - return 0; - case ICMP_ADDRESSREPLY: - /* - * We ought to set our netmask on receiving this, but - * experience shows it's a waste of effort. - */ - icmp_statistics.IcmpInAddrMaskReps++; - kfree_skb(skb1, FREE_READ); - return(0); - default: - icmp_statistics.IcmpInErrors++; - kfree_skb(skb1, FREE_READ); - return(0); - } - /*NOTREACHED*/ - kfree_skb(skb1, FREE_READ); - return(-1); -} - - -/* - * Perform any ICMP-related I/O control requests. - * [to vanish soon] - */ - -int icmp_ioctl(struct sock *sk, int cmd, unsigned long arg) -{ - switch(cmd) - { - default: - return(-EINVAL); - } - return(0); -} -- cgit v1.2.3