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net/ipv4/ip_options.c
15.2 KB
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/* * 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. * * The options processing module for ip.c * |
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* Authors: A.N.Kuznetsov |
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* |
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*/ |
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#define pr_fmt(fmt) "IPv4: " fmt |
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#include <linux/capability.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> #include <asm/uaccess.h> |
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#include <asm/unaligned.h> |
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#include <linux/skbuff.h> #include <linux/ip.h> #include <linux/icmp.h> #include <linux/netdevice.h> #include <linux/rtnetlink.h> #include <net/sock.h> #include <net/ip.h> #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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#include <net/ip_fib.h> |
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/* |
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* Write options to IP header, record destination address to * source route option, address of outgoing interface * (we should already know it, so that this function is allowed be * called only after routing decision) and timestamp, * if we originate this datagram. * * daddr is real destination address, next hop is recorded in IP header. * saddr is address of outgoing interface. */ |
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void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
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__be32 daddr, struct rtable *rt, int is_frag) |
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{ |
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unsigned char *iph = skb_network_header(skb); |
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memcpy(&(IPCB(skb)->opt), opt, sizeof(struct ip_options)); memcpy(iph+sizeof(struct iphdr), opt->__data, opt->optlen); opt = &(IPCB(skb)->opt); |
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if (opt->srr) memcpy(iph+opt->srr+iph[opt->srr+1]-4, &daddr, 4); if (!is_frag) { if (opt->rr_needaddr) |
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ip_rt_get_source(iph+opt->rr+iph[opt->rr+2]-5, skb, 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, skb, rt); |
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if (opt->ts_needtime) { |
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struct timespec tv; |
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__be32 midtime; |
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getnstimeofday(&tv); midtime = htonl((tv.tv_sec % 86400) * MSEC_PER_SEC + tv.tv_nsec / NSEC_PER_MSEC); |
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memcpy(iph+opt->ts+iph[opt->ts+2]-5, &midtime, 4); } return; } if (opt->rr) { memset(iph+opt->rr, IPOPT_NOP, iph[opt->rr+1]); opt->rr = 0; opt->rr_needaddr = 0; } if (opt->ts) { memset(iph+opt->ts, IPOPT_NOP, iph[opt->ts+1]); opt->ts = 0; opt->ts_needaddr = opt->ts_needtime = 0; } } |
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/* |
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* Provided (sopt, skb) points to received options, * build in dopt compiled option set appropriate for answering. * i.e. invert SRR option, copy anothers, * and grab room in RR/TS options. * * NOTE: dopt cannot point to skb. */ |
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int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb) |
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{ |
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const struct ip_options *sopt; |
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unsigned char *sptr, *dptr; int soffset, doffset; int optlen; |
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memset(dopt, 0, sizeof(struct ip_options)); |
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sopt = &(IPCB(skb)->opt); |
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if (sopt->optlen == 0) |
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return 0; |
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|
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sptr = skb_network_header(skb); |
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dptr = dopt->__data; |
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if (sopt->rr) { optlen = sptr[sopt->rr+1]; soffset = sptr[sopt->rr+2]; dopt->rr = dopt->optlen + sizeof(struct iphdr); memcpy(dptr, sptr+sopt->rr, optlen); if (sopt->rr_needaddr && soffset <= optlen) { if (soffset + 3 > optlen) return -EINVAL; dptr[2] = soffset + 4; dopt->rr_needaddr = 1; } dptr += optlen; dopt->optlen += optlen; } if (sopt->ts) { optlen = sptr[sopt->ts+1]; soffset = sptr[sopt->ts+2]; dopt->ts = dopt->optlen + sizeof(struct iphdr); memcpy(dptr, sptr+sopt->ts, optlen); if (soffset <= optlen) { if (sopt->ts_needaddr) { if (soffset + 3 > optlen) return -EINVAL; dopt->ts_needaddr = 1; soffset += 4; } if (sopt->ts_needtime) { if (soffset + 3 > optlen) return -EINVAL; if ((dptr[3]&0xF) != IPOPT_TS_PRESPEC) { dopt->ts_needtime = 1; soffset += 4; } else { dopt->ts_needtime = 0; |
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if (soffset + 7 <= optlen) { |
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__be32 addr; |
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|
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memcpy(&addr, dptr+soffset-1, 4); if (inet_addr_type(dev_net(skb_dst(skb)->dev), addr) != RTN_UNICAST) { |
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dopt->ts_needtime = 1; soffset += 8; } } } } dptr[2] = soffset; } dptr += optlen; dopt->optlen += optlen; } if (sopt->srr) { |
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unsigned char *start = sptr+sopt->srr; |
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__be32 faddr; |
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optlen = start[1]; soffset = start[2]; doffset = 0; if (soffset > optlen) soffset = optlen + 1; soffset -= 4; if (soffset > 3) { 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); /* * RFC1812 requires to fix illegal source routes. */ |
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if (memcmp(&ip_hdr(skb)->saddr, &start[soffset + 3], 4) == 0) |
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doffset -= 4; } if (doffset > 3) { |
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__be32 daddr = fib_compute_spec_dst(skb); |
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memcpy(&start[doffset-1], &daddr, 4); dopt->faddr = faddr; dptr[0] = start[0]; dptr[1] = doffset+3; dptr[2] = 4; dptr += doffset+3; dopt->srr = dopt->optlen + sizeof(struct iphdr); dopt->optlen += doffset+3; dopt->is_strictroute = sopt->is_strictroute; } } |
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if (sopt->cipso) { optlen = sptr[sopt->cipso+1]; dopt->cipso = dopt->optlen+sizeof(struct iphdr); memcpy(dptr, sptr+sopt->cipso, optlen); dptr += optlen; dopt->optlen += optlen; } |
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while (dopt->optlen & 3) { *dptr++ = IPOPT_END; dopt->optlen++; } return 0; } /* * Options "fragmenting", just fill options not * allowed in fragments with NOOPs. * Simple and stupid 8), but the most efficient way. */ |
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void ip_options_fragment(struct sk_buff *skb) |
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{ |
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unsigned char *optptr = skb_network_header(skb) + sizeof(struct iphdr); |
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struct ip_options *opt = &(IPCB(skb)->opt); |
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int l = opt->optlen; int optlen; while (l > 0) { switch (*optptr) { case IPOPT_END: return; case IPOPT_NOOP: l--; optptr++; continue; } optlen = optptr[1]; |
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if (optlen < 2 || optlen > l) |
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return; if (!IPOPT_COPIED(*optptr)) memset(optptr, IPOPT_NOOP, optlen); l -= optlen; optptr += optlen; } opt->ts = 0; opt->rr = 0; opt->rr_needaddr = 0; opt->ts_needaddr = 0; opt->ts_needtime = 0; |
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} |
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/* helper used by ip_options_compile() to call fib_compute_spec_dst() * at most one time. */ static void spec_dst_fill(__be32 *spec_dst, struct sk_buff *skb) { if (*spec_dst == htonl(INADDR_ANY)) *spec_dst = fib_compute_spec_dst(skb); } |
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/* * Verify options and fill pointers in struct options. * Caller should clear *opt, and set opt->data. * If opt == NULL, then skb->data should point to IP header. */ |
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int ip_options_compile(struct net *net, |
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struct ip_options *opt, struct sk_buff *skb) |
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{ |
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__be32 spec_dst = htonl(INADDR_ANY); |
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unsigned char *pp_ptr = NULL; |
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struct rtable *rt = NULL; |
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unsigned char *optptr; unsigned char *iph; int optlen, l; |
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if (skb != NULL) { |
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rt = skb_rtable(skb); |
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optptr = (unsigned char *)&(ip_hdr(skb)[1]); } else |
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optptr = opt->__data; |
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iph = optptr - sizeof(struct iphdr); |
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for (l = opt->optlen; l > 0; ) { 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) { *optptr = IPOPT_END; opt->is_changed = 1; } } goto eol; |
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case IPOPT_NOOP: |
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l--; optptr++; continue; } optlen = optptr[1]; |
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if (optlen < 2 || optlen > l) { |
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pp_ptr = optptr; goto error; } switch (*optptr) { |
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case IPOPT_SSRR: case IPOPT_LSRR: |
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if (optlen < 3) { pp_ptr = optptr + 1; goto error; } if (optptr[2] < 4) { pp_ptr = optptr + 2; goto error; } /* NB: cf RFC-1812 5.2.4.1 */ if (opt->srr) { pp_ptr = optptr; goto error; } if (!skb) { if (optptr[2] != 4 || optlen < 7 || ((optlen-3) & 3)) { pp_ptr = optptr + 1; goto error; } memcpy(&opt->faddr, &optptr[3], 4); if (optlen > 7) memmove(&optptr[3], &optptr[7], optlen-7); } opt->is_strictroute = (optptr[0] == IPOPT_SSRR); opt->srr = optptr - iph; break; |
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case IPOPT_RR: |
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if (opt->rr) { pp_ptr = optptr; goto error; } if (optlen < 3) { pp_ptr = optptr + 1; goto error; } if (optptr[2] < 4) { pp_ptr = optptr + 2; goto error; } if (optptr[2] <= optlen) { if (optptr[2]+3 > optlen) { pp_ptr = optptr + 2; goto error; } |
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if (rt) { |
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spec_dst_fill(&spec_dst, skb); |
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memcpy(&optptr[optptr[2]-1], &spec_dst, 4); |
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opt->is_changed = 1; } optptr[2] += 4; opt->rr_needaddr = 1; } opt->rr = optptr - iph; break; |
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case IPOPT_TIMESTAMP: |
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if (opt->ts) { pp_ptr = optptr; goto error; } if (optlen < 4) { pp_ptr = optptr + 1; goto error; } if (optptr[2] < 5) { pp_ptr = optptr + 2; goto error; } if (optptr[2] <= optlen) { |
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unsigned char *timeptr = NULL; |
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if (optptr[2]+3 > optlen) { |
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pp_ptr = optptr + 2; goto error; } switch (optptr[3]&0xF) { |
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case IPOPT_TS_TSONLY: |
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if (skb) |
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timeptr = &optptr[optptr[2]-1]; |
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opt->ts_needtime = 1; optptr[2] += 4; break; |
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case IPOPT_TS_TSANDADDR: |
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if (optptr[2]+7 > optlen) { |
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pp_ptr = optptr + 2; goto error; } |
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if (rt) { |
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spec_dst_fill(&spec_dst, skb); |
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memcpy(&optptr[optptr[2]-1], &spec_dst, 4); |
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timeptr = &optptr[optptr[2]+3]; |
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} opt->ts_needaddr = 1; opt->ts_needtime = 1; optptr[2] += 8; break; |
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case IPOPT_TS_PRESPEC: |
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if (optptr[2]+7 > optlen) { |
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pp_ptr = optptr + 2; goto error; } |
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{ |
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__be32 addr; |
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memcpy(&addr, &optptr[optptr[2]-1], 4); |
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if (inet_addr_type(net, addr) == RTN_UNICAST) |
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break; if (skb) |
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timeptr = &optptr[optptr[2]+3]; |
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} opt->ts_needtime = 1; optptr[2] += 8; break; |
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default: |
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if (!skb && !ns_capable(net->user_ns, CAP_NET_RAW)) { |
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pp_ptr = optptr + 3; goto error; } break; } if (timeptr) { |
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struct timespec tv; |
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u32 midtime; |
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getnstimeofday(&tv); |
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midtime = (tv.tv_sec % 86400) * MSEC_PER_SEC + tv.tv_nsec / NSEC_PER_MSEC; put_unaligned_be32(midtime, timeptr); |
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opt->is_changed = 1; } |
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} else if ((optptr[3]&0xF) != IPOPT_TS_PRESPEC) { |
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unsigned int overflow = optptr[3]>>4; |
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if (overflow == 15) { pp_ptr = optptr + 3; goto error; } |
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if (skb) { optptr[3] = (optptr[3]&0xF)|((overflow+1)<<4); opt->is_changed = 1; } } |
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opt->ts = optptr - iph; |
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break; |
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case IPOPT_RA: |
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if (optlen < 4) { pp_ptr = optptr + 1; goto error; } if (optptr[2] == 0 && optptr[3] == 0) opt->router_alert = optptr - iph; break; |
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case IPOPT_CIPSO: |
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if ((!skb && !ns_capable(net->user_ns, CAP_NET_RAW)) || opt->cipso) { |
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pp_ptr = optptr; goto error; } opt->cipso = optptr - iph; |
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if (cipso_v4_validate(skb, &optptr)) { |
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pp_ptr = optptr; goto error; } break; |
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case IPOPT_SEC: case IPOPT_SID: default: |
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if (!skb && !ns_capable(net->user_ns, CAP_NET_RAW)) { |
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pp_ptr = optptr; goto error; } break; } l -= optlen; optptr += optlen; } eol: if (!pp_ptr) return 0; error: if (skb) { icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((pp_ptr-iph)<<24)); } return -EINVAL; } |
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EXPORT_SYMBOL(ip_options_compile); |
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/* * Undo all the changes done by ip_options_compile(). */ |
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void ip_options_undo(struct ip_options *opt) |
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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); memcpy(optptr+3, &opt->faddr, 4); } 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; memset(&optptr[optptr[2]-1], 0, 4); } 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) { optptr[2] -= 4; memset(&optptr[optptr[2]-1], 0, 4); if ((optptr[3]&0xF) == IPOPT_TS_PRESPEC) optptr[2] -= 4; } if (opt->ts_needaddr) { optptr[2] -= 4; memset(&optptr[optptr[2]-1], 0, 4); } } } |
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static struct ip_options_rcu *ip_options_get_alloc(const int optlen) |
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{ |
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return kzalloc(sizeof(struct ip_options_rcu) + ((optlen + 3) & ~3), |
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GFP_KERNEL); |
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} |
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static int ip_options_get_finish(struct net *net, struct ip_options_rcu **optp, struct ip_options_rcu *opt, int optlen) |
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{ |
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while (optlen & 3) |
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opt->opt.__data[optlen++] = IPOPT_END; opt->opt.optlen = optlen; if (optlen && ip_options_compile(net, &opt->opt, NULL)) { |
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kfree(opt); return -EINVAL; } |
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kfree(*optp); |
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*optp = opt; return 0; } |
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int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, |
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unsigned char __user *data, int optlen) |
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{ |
f6d8bd051
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struct ip_options_rcu *opt = ip_options_get_alloc(optlen); |
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if (!opt) return -ENOMEM; |
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if (optlen && copy_from_user(opt->opt.__data, data, optlen)) { |
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kfree(opt); return -EFAULT; } |
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return ip_options_get_finish(net, optp, opt, optlen); |
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} |
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int ip_options_get(struct net *net, struct ip_options_rcu **optp, |
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529 |
unsigned char *data, int optlen) |
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{ |
f6d8bd051
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struct ip_options_rcu *opt = ip_options_get_alloc(optlen); |
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if (!opt) return -ENOMEM; if (optlen) |
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536 |
memcpy(opt->opt.__data, data, optlen); |
f2c4802b3
|
537 |
return ip_options_get_finish(net, optp, opt, optlen); |
4c6ea29d8
|
538 |
} |
1da177e4c
|
539 540 |
void ip_forward_options(struct sk_buff *skb) { |
5e73ea1a3
|
541 542 |
struct ip_options *opt = &(IPCB(skb)->opt); unsigned char *optptr; |
511c3f92a
|
543 |
struct rtable *rt = skb_rtable(skb); |
d56f90a7c
|
544 |
unsigned char *raw = skb_network_header(skb); |
1da177e4c
|
545 546 547 |
if (opt->rr_needaddr) { optptr = (unsigned char *)raw + opt->rr; |
8e36360ae
|
548 |
ip_rt_get_source(&optptr[optptr[2]-5], skb, rt); |
1da177e4c
|
549 550 551 552 553 554 |
opt->is_changed = 1; } if (opt->srr_is_hit) { int srrptr, srrspace; optptr = raw + opt->srr; |
a22318e83
|
555 |
for ( srrptr = optptr[2], srrspace = optptr[1]; |
1da177e4c
|
556 557 558 559 560 |
srrptr <= srrspace; srrptr += 4 ) { if (srrptr + 3 > srrspace) break; |
ac8a48106
|
561 |
if (memcmp(&opt->nexthop, &optptr[srrptr-1], 4) == 0) |
1da177e4c
|
562 563 564 565 |
break; } if (srrptr + 3 <= srrspace) { opt->is_changed = 1; |
ac8a48106
|
566 |
ip_hdr(skb)->daddr = opt->nexthop; |
5dc7883f2
|
567 |
ip_rt_get_source(&optptr[srrptr-1], skb, rt); |
1da177e4c
|
568 |
optptr[2] = srrptr+4; |
e87cc4728
|
569 570 571 572 573 |
} else { net_crit_ratelimited("%s(): Argh! Destination lost! ", __func__); } |
1da177e4c
|
574 575 |
if (opt->ts_needaddr) { optptr = raw + opt->ts; |
8e36360ae
|
576 |
ip_rt_get_source(&optptr[optptr[2]-9], skb, rt); |
1da177e4c
|
577 578 579 580 581 |
opt->is_changed = 1; } } if (opt->is_changed) { opt->is_changed = 0; |
eddc9ec53
|
582 |
ip_send_check(ip_hdr(skb)); |
1da177e4c
|
583 584 585 586 587 588 589 |
} } int ip_options_rcv_srr(struct sk_buff *skb) { struct ip_options *opt = &(IPCB(skb)->opt); int srrspace, srrptr; |
9e12bb22e
|
590 |
__be32 nexthop; |
eddc9ec53
|
591 |
struct iphdr *iph = ip_hdr(skb); |
d56f90a7c
|
592 |
unsigned char *optptr = skb_network_header(skb) + opt->srr; |
511c3f92a
|
593 |
struct rtable *rt = skb_rtable(skb); |
1da177e4c
|
594 |
struct rtable *rt2; |
7fee226ad
|
595 |
unsigned long orefdst; |
1da177e4c
|
596 |
int err; |
10949550b
|
597 |
if (!rt) |
1da177e4c
|
598 599 600 601 602 603 604 605 606 607 608 609 |
return 0; if (skb->pkt_type != PACKET_HOST) return -EINVAL; if (rt->rt_type == RTN_UNICAST) { if (!opt->is_strictroute) return 0; icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl(16<<24)); return -EINVAL; } if (rt->rt_type != RTN_LOCAL) return -EINVAL; |
a22318e83
|
610 |
for (srrptr = optptr[2], srrspace = optptr[1]; srrptr <= srrspace; srrptr += 4) { |
1da177e4c
|
611 612 613 614 615 |
if (srrptr + 3 > srrspace) { icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((opt->srr+2)<<24)); return -EINVAL; } memcpy(&nexthop, &optptr[srrptr-1], 4); |
7fee226ad
|
616 |
orefdst = skb->_skb_refdst; |
adf30907d
|
617 |
skb_dst_set(skb, NULL); |
1da177e4c
|
618 |
err = ip_route_input(skb, nexthop, iph->saddr, iph->tos, skb->dev); |
511c3f92a
|
619 |
rt2 = skb_rtable(skb); |
1da177e4c
|
620 |
if (err || (rt2->rt_type != RTN_UNICAST && rt2->rt_type != RTN_LOCAL)) { |
7fee226ad
|
621 622 |
skb_dst_drop(skb); skb->_skb_refdst = orefdst; |
1da177e4c
|
623 624 |
return -EINVAL; } |
7fee226ad
|
625 |
refdst_drop(orefdst); |
1da177e4c
|
626 627 628 |
if (rt2->rt_type != RTN_LOCAL) break; /* Superfast 8) loopback forward */ |
c30883bdf
|
629 |
iph->daddr = nexthop; |
1da177e4c
|
630 631 632 633 |
opt->is_changed = 1; } if (srrptr <= srrspace) { opt->srr_is_hit = 1; |
ac8a48106
|
634 |
opt->nexthop = nexthop; |
1da177e4c
|
635 636 637 638 |
opt->is_changed = 1; } return 0; } |
462fb2af9
|
639 |
EXPORT_SYMBOL(ip_options_rcv_srr); |