660 строки
15 KiB
C
660 строки
15 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* The options processing module for ip.c
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*
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* Version: $Id: ip_options.c,v 1.21 2001/09/01 00:31:50 davem Exp $
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*
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* Authors: A.N.Kuznetsov
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*
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*/
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#include <linux/capability.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <asm/uaccess.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/icmp.h>
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#include <linux/netdevice.h>
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#include <linux/rtnetlink.h>
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#include <net/sock.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/route.h>
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#include <net/cipso_ipv4.h>
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/*
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* Write options to IP header, record destination address to
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* source route option, address of outgoing interface
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* (we should already know it, so that this function is allowed be
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* called only after routing decision) and timestamp,
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* if we originate this datagram.
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*
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* daddr is real destination address, next hop is recorded in IP header.
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* saddr is address of outgoing interface.
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*/
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void ip_options_build(struct sk_buff * skb, struct ip_options * opt,
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u32 daddr, struct rtable *rt, int is_frag)
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{
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unsigned char * iph = skb->nh.raw;
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memcpy(&(IPCB(skb)->opt), opt, sizeof(struct ip_options));
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memcpy(iph+sizeof(struct iphdr), opt->__data, opt->optlen);
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opt = &(IPCB(skb)->opt);
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opt->is_data = 0;
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if (opt->srr)
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memcpy(iph+opt->srr+iph[opt->srr+1]-4, &daddr, 4);
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if (!is_frag) {
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if (opt->rr_needaddr)
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ip_rt_get_source(iph+opt->rr+iph[opt->rr+2]-5, rt);
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if (opt->ts_needaddr)
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ip_rt_get_source(iph+opt->ts+iph[opt->ts+2]-9, rt);
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if (opt->ts_needtime) {
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struct timeval tv;
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__u32 midtime;
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do_gettimeofday(&tv);
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midtime = htonl((tv.tv_sec % 86400) * 1000 + tv.tv_usec / 1000);
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memcpy(iph+opt->ts+iph[opt->ts+2]-5, &midtime, 4);
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}
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return;
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}
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if (opt->rr) {
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memset(iph+opt->rr, IPOPT_NOP, iph[opt->rr+1]);
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opt->rr = 0;
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opt->rr_needaddr = 0;
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}
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if (opt->ts) {
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memset(iph+opt->ts, IPOPT_NOP, iph[opt->ts+1]);
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opt->ts = 0;
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opt->ts_needaddr = opt->ts_needtime = 0;
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}
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}
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/*
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* Provided (sopt, skb) points to received options,
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* build in dopt compiled option set appropriate for answering.
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* i.e. invert SRR option, copy anothers,
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* and grab room in RR/TS options.
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*
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* NOTE: dopt cannot point to skb.
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*/
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int ip_options_echo(struct ip_options * dopt, struct sk_buff * skb)
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{
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struct ip_options *sopt;
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unsigned char *sptr, *dptr;
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int soffset, doffset;
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int optlen;
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u32 daddr;
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memset(dopt, 0, sizeof(struct ip_options));
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dopt->is_data = 1;
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sopt = &(IPCB(skb)->opt);
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if (sopt->optlen == 0) {
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dopt->optlen = 0;
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return 0;
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}
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sptr = skb->nh.raw;
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dptr = dopt->__data;
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if (skb->dst)
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daddr = ((struct rtable*)skb->dst)->rt_spec_dst;
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else
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daddr = skb->nh.iph->daddr;
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if (sopt->rr) {
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optlen = sptr[sopt->rr+1];
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soffset = sptr[sopt->rr+2];
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dopt->rr = dopt->optlen + sizeof(struct iphdr);
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memcpy(dptr, sptr+sopt->rr, optlen);
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if (sopt->rr_needaddr && soffset <= optlen) {
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if (soffset + 3 > optlen)
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return -EINVAL;
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dptr[2] = soffset + 4;
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dopt->rr_needaddr = 1;
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}
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dptr += optlen;
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dopt->optlen += optlen;
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}
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if (sopt->ts) {
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optlen = sptr[sopt->ts+1];
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soffset = sptr[sopt->ts+2];
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dopt->ts = dopt->optlen + sizeof(struct iphdr);
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memcpy(dptr, sptr+sopt->ts, optlen);
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if (soffset <= optlen) {
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if (sopt->ts_needaddr) {
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if (soffset + 3 > optlen)
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return -EINVAL;
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dopt->ts_needaddr = 1;
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soffset += 4;
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}
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if (sopt->ts_needtime) {
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if (soffset + 3 > optlen)
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return -EINVAL;
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if ((dptr[3]&0xF) != IPOPT_TS_PRESPEC) {
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dopt->ts_needtime = 1;
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soffset += 4;
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} else {
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dopt->ts_needtime = 0;
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if (soffset + 8 <= optlen) {
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__u32 addr;
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memcpy(&addr, sptr+soffset-1, 4);
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if (inet_addr_type(addr) != RTN_LOCAL) {
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dopt->ts_needtime = 1;
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soffset += 8;
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}
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}
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}
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}
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dptr[2] = soffset;
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}
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dptr += optlen;
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dopt->optlen += optlen;
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}
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if (sopt->srr) {
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unsigned char * start = sptr+sopt->srr;
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u32 faddr;
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optlen = start[1];
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soffset = start[2];
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doffset = 0;
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if (soffset > optlen)
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soffset = optlen + 1;
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soffset -= 4;
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if (soffset > 3) {
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memcpy(&faddr, &start[soffset-1], 4);
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for (soffset-=4, doffset=4; soffset > 3; soffset-=4, doffset+=4)
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memcpy(&dptr[doffset-1], &start[soffset-1], 4);
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/*
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* RFC1812 requires to fix illegal source routes.
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*/
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if (memcmp(&skb->nh.iph->saddr, &start[soffset+3], 4) == 0)
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doffset -= 4;
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}
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if (doffset > 3) {
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memcpy(&start[doffset-1], &daddr, 4);
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dopt->faddr = faddr;
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dptr[0] = start[0];
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dptr[1] = doffset+3;
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dptr[2] = 4;
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dptr += doffset+3;
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dopt->srr = dopt->optlen + sizeof(struct iphdr);
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dopt->optlen += doffset+3;
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dopt->is_strictroute = sopt->is_strictroute;
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}
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}
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if (sopt->cipso) {
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optlen = sptr[sopt->cipso+1];
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dopt->cipso = dopt->optlen+sizeof(struct iphdr);
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memcpy(dptr, sptr+sopt->cipso, optlen);
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dptr += optlen;
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dopt->optlen += optlen;
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}
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while (dopt->optlen & 3) {
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*dptr++ = IPOPT_END;
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dopt->optlen++;
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}
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return 0;
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}
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/*
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* Options "fragmenting", just fill options not
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* allowed in fragments with NOOPs.
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* Simple and stupid 8), but the most efficient way.
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*/
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void ip_options_fragment(struct sk_buff * skb)
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{
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unsigned char * optptr = skb->nh.raw + sizeof(struct iphdr);
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struct ip_options * opt = &(IPCB(skb)->opt);
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int l = opt->optlen;
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int optlen;
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while (l > 0) {
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switch (*optptr) {
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case IPOPT_END:
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return;
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case IPOPT_NOOP:
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l--;
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optptr++;
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continue;
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}
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optlen = optptr[1];
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if (optlen<2 || optlen>l)
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return;
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if (!IPOPT_COPIED(*optptr))
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memset(optptr, IPOPT_NOOP, optlen);
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l -= optlen;
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optptr += optlen;
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}
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opt->ts = 0;
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opt->rr = 0;
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opt->rr_needaddr = 0;
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opt->ts_needaddr = 0;
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opt->ts_needtime = 0;
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return;
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}
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/*
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* Verify options and fill pointers in struct options.
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* Caller should clear *opt, and set opt->data.
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* If opt == NULL, then skb->data should point to IP header.
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*/
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int ip_options_compile(struct ip_options * opt, struct sk_buff * skb)
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{
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int l;
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unsigned char * iph;
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unsigned char * optptr;
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int optlen;
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unsigned char * pp_ptr = NULL;
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struct rtable *rt = skb ? (struct rtable*)skb->dst : NULL;
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if (!opt) {
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opt = &(IPCB(skb)->opt);
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iph = skb->nh.raw;
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opt->optlen = ((struct iphdr *)iph)->ihl*4 - sizeof(struct iphdr);
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optptr = iph + sizeof(struct iphdr);
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opt->is_data = 0;
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} else {
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optptr = opt->is_data ? opt->__data : (unsigned char*)&(skb->nh.iph[1]);
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iph = optptr - sizeof(struct iphdr);
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}
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for (l = opt->optlen; l > 0; ) {
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switch (*optptr) {
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case IPOPT_END:
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for (optptr++, l--; l>0; optptr++, l--) {
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if (*optptr != IPOPT_END) {
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*optptr = IPOPT_END;
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opt->is_changed = 1;
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}
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}
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goto eol;
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case IPOPT_NOOP:
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l--;
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optptr++;
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continue;
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}
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optlen = optptr[1];
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if (optlen<2 || optlen>l) {
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pp_ptr = optptr;
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goto error;
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}
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switch (*optptr) {
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case IPOPT_SSRR:
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case IPOPT_LSRR:
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if (optlen < 3) {
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pp_ptr = optptr + 1;
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goto error;
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}
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if (optptr[2] < 4) {
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pp_ptr = optptr + 2;
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goto error;
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}
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/* NB: cf RFC-1812 5.2.4.1 */
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if (opt->srr) {
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pp_ptr = optptr;
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goto error;
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}
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if (!skb) {
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if (optptr[2] != 4 || optlen < 7 || ((optlen-3) & 3)) {
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pp_ptr = optptr + 1;
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goto error;
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}
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memcpy(&opt->faddr, &optptr[3], 4);
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if (optlen > 7)
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memmove(&optptr[3], &optptr[7], optlen-7);
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}
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opt->is_strictroute = (optptr[0] == IPOPT_SSRR);
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opt->srr = optptr - iph;
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break;
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case IPOPT_RR:
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if (opt->rr) {
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pp_ptr = optptr;
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goto error;
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}
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if (optlen < 3) {
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pp_ptr = optptr + 1;
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goto error;
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}
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if (optptr[2] < 4) {
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pp_ptr = optptr + 2;
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goto error;
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}
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if (optptr[2] <= optlen) {
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if (optptr[2]+3 > optlen) {
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pp_ptr = optptr + 2;
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goto error;
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}
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if (skb) {
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memcpy(&optptr[optptr[2]-1], &rt->rt_spec_dst, 4);
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opt->is_changed = 1;
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}
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optptr[2] += 4;
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opt->rr_needaddr = 1;
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}
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opt->rr = optptr - iph;
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break;
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case IPOPT_TIMESTAMP:
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if (opt->ts) {
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pp_ptr = optptr;
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goto error;
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}
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if (optlen < 4) {
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pp_ptr = optptr + 1;
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goto error;
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}
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if (optptr[2] < 5) {
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pp_ptr = optptr + 2;
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goto error;
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}
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if (optptr[2] <= optlen) {
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__u32 * timeptr = NULL;
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if (optptr[2]+3 > optptr[1]) {
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pp_ptr = optptr + 2;
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goto error;
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}
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switch (optptr[3]&0xF) {
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case IPOPT_TS_TSONLY:
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opt->ts = optptr - iph;
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if (skb)
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timeptr = (__u32*)&optptr[optptr[2]-1];
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opt->ts_needtime = 1;
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optptr[2] += 4;
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break;
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case IPOPT_TS_TSANDADDR:
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if (optptr[2]+7 > optptr[1]) {
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pp_ptr = optptr + 2;
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goto error;
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}
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opt->ts = optptr - iph;
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if (skb) {
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memcpy(&optptr[optptr[2]-1], &rt->rt_spec_dst, 4);
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timeptr = (__u32*)&optptr[optptr[2]+3];
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}
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opt->ts_needaddr = 1;
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opt->ts_needtime = 1;
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optptr[2] += 8;
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break;
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case IPOPT_TS_PRESPEC:
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if (optptr[2]+7 > optptr[1]) {
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pp_ptr = optptr + 2;
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goto error;
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}
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opt->ts = optptr - iph;
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{
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u32 addr;
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memcpy(&addr, &optptr[optptr[2]-1], 4);
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if (inet_addr_type(addr) == RTN_UNICAST)
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break;
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if (skb)
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timeptr = (__u32*)&optptr[optptr[2]+3];
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}
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opt->ts_needtime = 1;
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optptr[2] += 8;
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break;
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default:
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if (!skb && !capable(CAP_NET_RAW)) {
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pp_ptr = optptr + 3;
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goto error;
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}
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break;
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}
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if (timeptr) {
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struct timeval tv;
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__u32 midtime;
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do_gettimeofday(&tv);
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midtime = htonl((tv.tv_sec % 86400) * 1000 + tv.tv_usec / 1000);
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memcpy(timeptr, &midtime, sizeof(__u32));
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opt->is_changed = 1;
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}
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} else {
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unsigned overflow = optptr[3]>>4;
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if (overflow == 15) {
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pp_ptr = optptr + 3;
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goto error;
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}
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opt->ts = optptr - iph;
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if (skb) {
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optptr[3] = (optptr[3]&0xF)|((overflow+1)<<4);
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opt->is_changed = 1;
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}
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}
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break;
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case IPOPT_RA:
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if (optlen < 4) {
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pp_ptr = optptr + 1;
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goto error;
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}
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if (optptr[2] == 0 && optptr[3] == 0)
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opt->router_alert = optptr - iph;
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break;
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case IPOPT_CIPSO:
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if (opt->cipso) {
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pp_ptr = optptr;
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goto error;
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}
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opt->cipso = optptr - iph;
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if (cipso_v4_validate(&optptr)) {
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pp_ptr = optptr;
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goto error;
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}
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break;
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case IPOPT_SEC:
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case IPOPT_SID:
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default:
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if (!skb && !capable(CAP_NET_RAW)) {
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pp_ptr = optptr;
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goto error;
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}
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break;
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}
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l -= optlen;
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optptr += optlen;
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}
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eol:
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if (!pp_ptr)
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return 0;
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error:
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if (skb) {
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icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((pp_ptr-iph)<<24));
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}
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return -EINVAL;
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}
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/*
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* Undo all the changes done by ip_options_compile().
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*/
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void ip_options_undo(struct ip_options * opt)
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{
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if (opt->srr) {
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unsigned char * optptr = opt->__data+opt->srr-sizeof(struct iphdr);
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memmove(optptr+7, optptr+3, optptr[1]-7);
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memcpy(optptr+3, &opt->faddr, 4);
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}
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if (opt->rr_needaddr) {
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unsigned char * optptr = opt->__data+opt->rr-sizeof(struct iphdr);
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optptr[2] -= 4;
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memset(&optptr[optptr[2]-1], 0, 4);
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}
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if (opt->ts) {
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unsigned char * optptr = opt->__data+opt->ts-sizeof(struct iphdr);
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if (opt->ts_needtime) {
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optptr[2] -= 4;
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memset(&optptr[optptr[2]-1], 0, 4);
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if ((optptr[3]&0xF) == IPOPT_TS_PRESPEC)
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optptr[2] -= 4;
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}
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if (opt->ts_needaddr) {
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optptr[2] -= 4;
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memset(&optptr[optptr[2]-1], 0, 4);
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}
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}
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}
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static struct ip_options *ip_options_get_alloc(const int optlen)
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{
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struct ip_options *opt = kmalloc(sizeof(*opt) + ((optlen + 3) & ~3),
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GFP_KERNEL);
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if (opt)
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memset(opt, 0, sizeof(*opt));
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return opt;
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}
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static int ip_options_get_finish(struct ip_options **optp,
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struct ip_options *opt, int optlen)
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{
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while (optlen & 3)
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opt->__data[optlen++] = IPOPT_END;
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opt->optlen = optlen;
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opt->is_data = 1;
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if (optlen && ip_options_compile(opt, NULL)) {
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kfree(opt);
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return -EINVAL;
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}
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kfree(*optp);
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*optp = opt;
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return 0;
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}
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int ip_options_get_from_user(struct ip_options **optp, unsigned char __user *data, int optlen)
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{
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struct ip_options *opt = ip_options_get_alloc(optlen);
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if (!opt)
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return -ENOMEM;
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if (optlen && copy_from_user(opt->__data, data, optlen)) {
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kfree(opt);
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return -EFAULT;
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}
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return ip_options_get_finish(optp, opt, optlen);
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}
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int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen)
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{
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struct ip_options *opt = ip_options_get_alloc(optlen);
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if (!opt)
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return -ENOMEM;
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if (optlen)
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memcpy(opt->__data, data, optlen);
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return ip_options_get_finish(optp, opt, optlen);
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}
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void ip_forward_options(struct sk_buff *skb)
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{
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struct ip_options * opt = &(IPCB(skb)->opt);
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unsigned char * optptr;
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struct rtable *rt = (struct rtable*)skb->dst;
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unsigned char *raw = skb->nh.raw;
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if (opt->rr_needaddr) {
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optptr = (unsigned char *)raw + opt->rr;
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ip_rt_get_source(&optptr[optptr[2]-5], rt);
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opt->is_changed = 1;
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}
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if (opt->srr_is_hit) {
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int srrptr, srrspace;
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optptr = raw + opt->srr;
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for ( srrptr=optptr[2], srrspace = optptr[1];
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srrptr <= srrspace;
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srrptr += 4
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) {
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if (srrptr + 3 > srrspace)
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break;
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if (memcmp(&rt->rt_dst, &optptr[srrptr-1], 4) == 0)
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break;
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}
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if (srrptr + 3 <= srrspace) {
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opt->is_changed = 1;
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ip_rt_get_source(&optptr[srrptr-1], rt);
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skb->nh.iph->daddr = rt->rt_dst;
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optptr[2] = srrptr+4;
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} else if (net_ratelimit())
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printk(KERN_CRIT "ip_forward(): Argh! Destination lost!\n");
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if (opt->ts_needaddr) {
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optptr = raw + opt->ts;
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ip_rt_get_source(&optptr[optptr[2]-9], rt);
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opt->is_changed = 1;
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}
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}
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if (opt->is_changed) {
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opt->is_changed = 0;
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ip_send_check(skb->nh.iph);
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}
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}
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int ip_options_rcv_srr(struct sk_buff *skb)
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{
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struct ip_options *opt = &(IPCB(skb)->opt);
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int srrspace, srrptr;
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u32 nexthop;
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struct iphdr *iph = skb->nh.iph;
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unsigned char * optptr = skb->nh.raw + opt->srr;
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struct rtable *rt = (struct rtable*)skb->dst;
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struct rtable *rt2;
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int err;
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if (!opt->srr)
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return 0;
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if (skb->pkt_type != PACKET_HOST)
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return -EINVAL;
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if (rt->rt_type == RTN_UNICAST) {
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if (!opt->is_strictroute)
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return 0;
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icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl(16<<24));
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return -EINVAL;
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}
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if (rt->rt_type != RTN_LOCAL)
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return -EINVAL;
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for (srrptr=optptr[2], srrspace = optptr[1]; srrptr <= srrspace; srrptr += 4) {
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if (srrptr + 3 > srrspace) {
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icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((opt->srr+2)<<24));
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return -EINVAL;
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}
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memcpy(&nexthop, &optptr[srrptr-1], 4);
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rt = (struct rtable*)skb->dst;
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skb->dst = NULL;
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err = ip_route_input(skb, nexthop, iph->saddr, iph->tos, skb->dev);
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rt2 = (struct rtable*)skb->dst;
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if (err || (rt2->rt_type != RTN_UNICAST && rt2->rt_type != RTN_LOCAL)) {
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ip_rt_put(rt2);
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skb->dst = &rt->u.dst;
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return -EINVAL;
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}
|
|
ip_rt_put(rt);
|
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if (rt2->rt_type != RTN_LOCAL)
|
|
break;
|
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/* Superfast 8) loopback forward */
|
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memcpy(&iph->daddr, &optptr[srrptr-1], 4);
|
|
opt->is_changed = 1;
|
|
}
|
|
if (srrptr <= srrspace) {
|
|
opt->srr_is_hit = 1;
|
|
opt->is_changed = 1;
|
|
}
|
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return 0;
|
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}
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