Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * The options processing module for ip.c |
| 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Authors: A.N.Kuznetsov |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 9 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 12 | #define pr_fmt(fmt) "IPv4: " fmt |
| 13 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 14 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 16 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/types.h> |
| 18 | #include <asm/uaccess.h> |
Chris Metcalf | 48bdf07 | 2011-05-29 10:55:44 +0000 | [diff] [blame] | 19 | #include <asm/unaligned.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/skbuff.h> |
| 21 | #include <linux/ip.h> |
| 22 | #include <linux/icmp.h> |
| 23 | #include <linux/netdevice.h> |
| 24 | #include <linux/rtnetlink.h> |
| 25 | #include <net/sock.h> |
| 26 | #include <net/ip.h> |
| 27 | #include <net/icmp.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 28 | #include <net/route.h> |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 29 | #include <net/cipso_ipv4.h> |
David S. Miller | 35ebf65 | 2012-06-28 03:59:11 -0700 | [diff] [blame] | 30 | #include <net/ip_fib.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 32 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | * Write options to IP header, record destination address to |
| 34 | * source route option, address of outgoing interface |
| 35 | * (we should already know it, so that this function is allowed be |
| 36 | * called only after routing decision) and timestamp, |
| 37 | * if we originate this datagram. |
| 38 | * |
| 39 | * daddr is real destination address, next hop is recorded in IP header. |
| 40 | * saddr is address of outgoing interface. |
| 41 | */ |
| 42 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 43 | void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 44 | __be32 daddr, struct rtable *rt, int is_frag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 46 | unsigned char *iph = skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | memcpy(&(IPCB(skb)->opt), opt, sizeof(struct ip_options)); |
| 49 | memcpy(iph+sizeof(struct iphdr), opt->__data, opt->optlen); |
| 50 | opt = &(IPCB(skb)->opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | if (opt->srr) |
| 53 | memcpy(iph+opt->srr+iph[opt->srr+1]-4, &daddr, 4); |
| 54 | |
| 55 | if (!is_frag) { |
| 56 | if (opt->rr_needaddr) |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 57 | ip_rt_get_source(iph+opt->rr+iph[opt->rr+2]-5, skb, rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | if (opt->ts_needaddr) |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 59 | ip_rt_get_source(iph+opt->ts+iph[opt->ts+2]-9, skb, rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | if (opt->ts_needtime) { |
YOSHIFUJI Hideaki | f25c3d6 | 2008-04-21 02:34:08 -0700 | [diff] [blame] | 61 | struct timespec tv; |
Al Viro | e25d2ca | 2006-09-27 18:28:47 -0700 | [diff] [blame] | 62 | __be32 midtime; |
YOSHIFUJI Hideaki | f25c3d6 | 2008-04-21 02:34:08 -0700 | [diff] [blame] | 63 | getnstimeofday(&tv); |
| 64 | midtime = htonl((tv.tv_sec % 86400) * MSEC_PER_SEC + tv.tv_nsec / NSEC_PER_MSEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | memcpy(iph+opt->ts+iph[opt->ts+2]-5, &midtime, 4); |
| 66 | } |
| 67 | return; |
| 68 | } |
| 69 | if (opt->rr) { |
| 70 | memset(iph+opt->rr, IPOPT_NOP, iph[opt->rr+1]); |
| 71 | opt->rr = 0; |
| 72 | opt->rr_needaddr = 0; |
| 73 | } |
| 74 | if (opt->ts) { |
| 75 | memset(iph+opt->ts, IPOPT_NOP, iph[opt->ts+1]); |
| 76 | opt->ts = 0; |
| 77 | opt->ts_needaddr = opt->ts_needtime = 0; |
| 78 | } |
| 79 | } |
| 80 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 81 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | * Provided (sopt, skb) points to received options, |
| 83 | * build in dopt compiled option set appropriate for answering. |
| 84 | * i.e. invert SRR option, copy anothers, |
| 85 | * and grab room in RR/TS options. |
| 86 | * |
| 87 | * NOTE: dopt cannot point to skb. |
| 88 | */ |
| 89 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 90 | int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 92 | const struct ip_options *sopt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | unsigned char *sptr, *dptr; |
| 94 | int soffset, doffset; |
| 95 | int optlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
| 97 | memset(dopt, 0, sizeof(struct ip_options)); |
| 98 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | sopt = &(IPCB(skb)->opt); |
| 100 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 101 | if (sopt->optlen == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 104 | sptr = skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | dptr = dopt->__data; |
| 106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | if (sopt->rr) { |
| 108 | optlen = sptr[sopt->rr+1]; |
| 109 | soffset = sptr[sopt->rr+2]; |
| 110 | dopt->rr = dopt->optlen + sizeof(struct iphdr); |
| 111 | memcpy(dptr, sptr+sopt->rr, optlen); |
| 112 | if (sopt->rr_needaddr && soffset <= optlen) { |
| 113 | if (soffset + 3 > optlen) |
| 114 | return -EINVAL; |
| 115 | dptr[2] = soffset + 4; |
| 116 | dopt->rr_needaddr = 1; |
| 117 | } |
| 118 | dptr += optlen; |
| 119 | dopt->optlen += optlen; |
| 120 | } |
| 121 | if (sopt->ts) { |
| 122 | optlen = sptr[sopt->ts+1]; |
| 123 | soffset = sptr[sopt->ts+2]; |
| 124 | dopt->ts = dopt->optlen + sizeof(struct iphdr); |
| 125 | memcpy(dptr, sptr+sopt->ts, optlen); |
| 126 | if (soffset <= optlen) { |
| 127 | if (sopt->ts_needaddr) { |
| 128 | if (soffset + 3 > optlen) |
| 129 | return -EINVAL; |
| 130 | dopt->ts_needaddr = 1; |
| 131 | soffset += 4; |
| 132 | } |
| 133 | if (sopt->ts_needtime) { |
| 134 | if (soffset + 3 > optlen) |
| 135 | return -EINVAL; |
| 136 | if ((dptr[3]&0xF) != IPOPT_TS_PRESPEC) { |
| 137 | dopt->ts_needtime = 1; |
| 138 | soffset += 4; |
| 139 | } else { |
| 140 | dopt->ts_needtime = 0; |
| 141 | |
Jan Luebbe | 8628bd8 | 2011-03-24 07:44:22 +0000 | [diff] [blame] | 142 | if (soffset + 7 <= optlen) { |
Al Viro | fd68322 | 2006-09-26 22:17:51 -0700 | [diff] [blame] | 143 | __be32 addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Jan Luebbe | 8628bd8 | 2011-03-24 07:44:22 +0000 | [diff] [blame] | 145 | memcpy(&addr, dptr+soffset-1, 4); |
| 146 | if (inet_addr_type(dev_net(skb_dst(skb)->dev), addr) != RTN_UNICAST) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | dopt->ts_needtime = 1; |
| 148 | soffset += 8; |
| 149 | } |
| 150 | } |
| 151 | } |
| 152 | } |
| 153 | dptr[2] = soffset; |
| 154 | } |
| 155 | dptr += optlen; |
| 156 | dopt->optlen += optlen; |
| 157 | } |
| 158 | if (sopt->srr) { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 159 | unsigned char *start = sptr+sopt->srr; |
Al Viro | 3ca3c68 | 2006-09-27 18:28:07 -0700 | [diff] [blame] | 160 | __be32 faddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
| 162 | optlen = start[1]; |
| 163 | soffset = start[2]; |
| 164 | doffset = 0; |
| 165 | if (soffset > optlen) |
| 166 | soffset = optlen + 1; |
| 167 | soffset -= 4; |
| 168 | if (soffset > 3) { |
| 169 | memcpy(&faddr, &start[soffset-1], 4); |
Weilong Chen | a22318e | 2013-12-23 14:37:26 +0800 | [diff] [blame] | 170 | for (soffset -= 4, doffset = 4; soffset > 3; soffset -= 4, doffset += 4) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | memcpy(&dptr[doffset-1], &start[soffset-1], 4); |
| 172 | /* |
| 173 | * RFC1812 requires to fix illegal source routes. |
| 174 | */ |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 175 | if (memcmp(&ip_hdr(skb)->saddr, |
| 176 | &start[soffset + 3], 4) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | doffset -= 4; |
| 178 | } |
| 179 | if (doffset > 3) { |
Julian Anastasov | 6255e5e | 2012-07-18 21:34:24 +0000 | [diff] [blame] | 180 | __be32 daddr = fib_compute_spec_dst(skb); |
| 181 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | memcpy(&start[doffset-1], &daddr, 4); |
| 183 | dopt->faddr = faddr; |
| 184 | dptr[0] = start[0]; |
| 185 | dptr[1] = doffset+3; |
| 186 | dptr[2] = 4; |
| 187 | dptr += doffset+3; |
| 188 | dopt->srr = dopt->optlen + sizeof(struct iphdr); |
| 189 | dopt->optlen += doffset+3; |
| 190 | dopt->is_strictroute = sopt->is_strictroute; |
| 191 | } |
| 192 | } |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 193 | if (sopt->cipso) { |
| 194 | optlen = sptr[sopt->cipso+1]; |
| 195 | dopt->cipso = dopt->optlen+sizeof(struct iphdr); |
| 196 | memcpy(dptr, sptr+sopt->cipso, optlen); |
| 197 | dptr += optlen; |
| 198 | dopt->optlen += optlen; |
| 199 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | while (dopt->optlen & 3) { |
| 201 | *dptr++ = IPOPT_END; |
| 202 | dopt->optlen++; |
| 203 | } |
| 204 | return 0; |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * Options "fragmenting", just fill options not |
| 209 | * allowed in fragments with NOOPs. |
| 210 | * Simple and stupid 8), but the most efficient way. |
| 211 | */ |
| 212 | |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 213 | void ip_options_fragment(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 215 | unsigned char *optptr = skb_network_header(skb) + sizeof(struct iphdr); |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 216 | struct ip_options *opt = &(IPCB(skb)->opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | int l = opt->optlen; |
| 218 | int optlen; |
| 219 | |
| 220 | while (l > 0) { |
| 221 | switch (*optptr) { |
| 222 | case IPOPT_END: |
| 223 | return; |
| 224 | case IPOPT_NOOP: |
| 225 | l--; |
| 226 | optptr++; |
| 227 | continue; |
| 228 | } |
| 229 | optlen = optptr[1]; |
Weilong Chen | a22318e | 2013-12-23 14:37:26 +0800 | [diff] [blame] | 230 | if (optlen < 2 || optlen > l) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | return; |
| 232 | if (!IPOPT_COPIED(*optptr)) |
| 233 | memset(optptr, IPOPT_NOOP, optlen); |
| 234 | l -= optlen; |
| 235 | optptr += optlen; |
| 236 | } |
| 237 | opt->ts = 0; |
| 238 | opt->rr = 0; |
| 239 | opt->rr_needaddr = 0; |
| 240 | opt->ts_needaddr = 0; |
| 241 | opt->ts_needtime = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | } |
| 243 | |
Eric Dumazet | bf5e53e | 2012-07-04 22:30:09 +0000 | [diff] [blame] | 244 | /* helper used by ip_options_compile() to call fib_compute_spec_dst() |
| 245 | * at most one time. |
| 246 | */ |
| 247 | static void spec_dst_fill(__be32 *spec_dst, struct sk_buff *skb) |
| 248 | { |
| 249 | if (*spec_dst == htonl(INADDR_ANY)) |
| 250 | *spec_dst = fib_compute_spec_dst(skb); |
| 251 | } |
| 252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | /* |
| 254 | * Verify options and fill pointers in struct options. |
| 255 | * Caller should clear *opt, and set opt->data. |
| 256 | * If opt == NULL, then skb->data should point to IP header. |
| 257 | */ |
| 258 | |
Denis V. Lunev | 0e6bd4a | 2008-03-24 15:29:23 -0700 | [diff] [blame] | 259 | int ip_options_compile(struct net *net, |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 260 | struct ip_options *opt, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | { |
Eric Dumazet | bf5e53e | 2012-07-04 22:30:09 +0000 | [diff] [blame] | 262 | __be32 spec_dst = htonl(INADDR_ANY); |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 263 | unsigned char *pp_ptr = NULL; |
David S. Miller | 1160472 | 2012-07-04 16:13:17 -0700 | [diff] [blame] | 264 | struct rtable *rt = NULL; |
David S. Miller | 35ebf65 | 2012-06-28 03:59:11 -0700 | [diff] [blame] | 265 | unsigned char *optptr; |
| 266 | unsigned char *iph; |
| 267 | int optlen, l; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
Denis V. Lunev | 22aba38 | 2008-03-22 16:36:20 -0700 | [diff] [blame] | 269 | if (skb != NULL) { |
David S. Miller | 1160472 | 2012-07-04 16:13:17 -0700 | [diff] [blame] | 270 | rt = skb_rtable(skb); |
Denis V. Lunev | 22aba38 | 2008-03-22 16:36:20 -0700 | [diff] [blame] | 271 | optptr = (unsigned char *)&(ip_hdr(skb)[1]); |
| 272 | } else |
Denis V. Lunev | 10fe7d8 | 2008-03-22 16:35:00 -0700 | [diff] [blame] | 273 | optptr = opt->__data; |
Denis V. Lunev | 22aba38 | 2008-03-22 16:36:20 -0700 | [diff] [blame] | 274 | iph = optptr - sizeof(struct iphdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
| 276 | for (l = opt->optlen; l > 0; ) { |
| 277 | switch (*optptr) { |
Weilong Chen | dd9b455 | 2013-12-31 15:11:28 +0800 | [diff] [blame] | 278 | case IPOPT_END: |
Weilong Chen | a22318e | 2013-12-23 14:37:26 +0800 | [diff] [blame] | 279 | for (optptr++, l--; l > 0; optptr++, l--) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | if (*optptr != IPOPT_END) { |
| 281 | *optptr = IPOPT_END; |
| 282 | opt->is_changed = 1; |
| 283 | } |
| 284 | } |
| 285 | goto eol; |
Weilong Chen | dd9b455 | 2013-12-31 15:11:28 +0800 | [diff] [blame] | 286 | case IPOPT_NOOP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | l--; |
| 288 | optptr++; |
| 289 | continue; |
| 290 | } |
Eric Dumazet | 10ec947 | 2014-07-21 07:17:42 +0200 | [diff] [blame] | 291 | if (unlikely(l < 2)) { |
| 292 | pp_ptr = optptr; |
| 293 | goto error; |
| 294 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | optlen = optptr[1]; |
Weilong Chen | a22318e | 2013-12-23 14:37:26 +0800 | [diff] [blame] | 296 | if (optlen < 2 || optlen > l) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | pp_ptr = optptr; |
| 298 | goto error; |
| 299 | } |
| 300 | switch (*optptr) { |
Weilong Chen | dd9b455 | 2013-12-31 15:11:28 +0800 | [diff] [blame] | 301 | case IPOPT_SSRR: |
| 302 | case IPOPT_LSRR: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | if (optlen < 3) { |
| 304 | pp_ptr = optptr + 1; |
| 305 | goto error; |
| 306 | } |
| 307 | if (optptr[2] < 4) { |
| 308 | pp_ptr = optptr + 2; |
| 309 | goto error; |
| 310 | } |
| 311 | /* NB: cf RFC-1812 5.2.4.1 */ |
| 312 | if (opt->srr) { |
| 313 | pp_ptr = optptr; |
| 314 | goto error; |
| 315 | } |
| 316 | if (!skb) { |
| 317 | if (optptr[2] != 4 || optlen < 7 || ((optlen-3) & 3)) { |
| 318 | pp_ptr = optptr + 1; |
| 319 | goto error; |
| 320 | } |
| 321 | memcpy(&opt->faddr, &optptr[3], 4); |
| 322 | if (optlen > 7) |
| 323 | memmove(&optptr[3], &optptr[7], optlen-7); |
| 324 | } |
| 325 | opt->is_strictroute = (optptr[0] == IPOPT_SSRR); |
| 326 | opt->srr = optptr - iph; |
| 327 | break; |
Weilong Chen | dd9b455 | 2013-12-31 15:11:28 +0800 | [diff] [blame] | 328 | case IPOPT_RR: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | if (opt->rr) { |
| 330 | pp_ptr = optptr; |
| 331 | goto error; |
| 332 | } |
| 333 | if (optlen < 3) { |
| 334 | pp_ptr = optptr + 1; |
| 335 | goto error; |
| 336 | } |
| 337 | if (optptr[2] < 4) { |
| 338 | pp_ptr = optptr + 2; |
| 339 | goto error; |
| 340 | } |
| 341 | if (optptr[2] <= optlen) { |
| 342 | if (optptr[2]+3 > optlen) { |
| 343 | pp_ptr = optptr + 2; |
| 344 | goto error; |
| 345 | } |
David S. Miller | 1160472 | 2012-07-04 16:13:17 -0700 | [diff] [blame] | 346 | if (rt) { |
Eric Dumazet | bf5e53e | 2012-07-04 22:30:09 +0000 | [diff] [blame] | 347 | spec_dst_fill(&spec_dst, skb); |
David S. Miller | 35ebf65 | 2012-06-28 03:59:11 -0700 | [diff] [blame] | 348 | memcpy(&optptr[optptr[2]-1], &spec_dst, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | opt->is_changed = 1; |
| 350 | } |
| 351 | optptr[2] += 4; |
| 352 | opt->rr_needaddr = 1; |
| 353 | } |
| 354 | opt->rr = optptr - iph; |
| 355 | break; |
Weilong Chen | dd9b455 | 2013-12-31 15:11:28 +0800 | [diff] [blame] | 356 | case IPOPT_TIMESTAMP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | if (opt->ts) { |
| 358 | pp_ptr = optptr; |
| 359 | goto error; |
| 360 | } |
| 361 | if (optlen < 4) { |
| 362 | pp_ptr = optptr + 1; |
| 363 | goto error; |
| 364 | } |
| 365 | if (optptr[2] < 5) { |
| 366 | pp_ptr = optptr + 2; |
| 367 | goto error; |
| 368 | } |
| 369 | if (optptr[2] <= optlen) { |
Chris Metcalf | 48bdf07 | 2011-05-29 10:55:44 +0000 | [diff] [blame] | 370 | unsigned char *timeptr = NULL; |
Hisao Tanabe | 5a2b646 | 2014-04-27 19:03:45 +0900 | [diff] [blame] | 371 | if (optptr[2]+3 > optlen) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | pp_ptr = optptr + 2; |
| 373 | goto error; |
| 374 | } |
| 375 | switch (optptr[3]&0xF) { |
Weilong Chen | dd9b455 | 2013-12-31 15:11:28 +0800 | [diff] [blame] | 376 | case IPOPT_TS_TSONLY: |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 377 | if (skb) |
Chris Metcalf | 48bdf07 | 2011-05-29 10:55:44 +0000 | [diff] [blame] | 378 | timeptr = &optptr[optptr[2]-1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | opt->ts_needtime = 1; |
| 380 | optptr[2] += 4; |
| 381 | break; |
Weilong Chen | dd9b455 | 2013-12-31 15:11:28 +0800 | [diff] [blame] | 382 | case IPOPT_TS_TSANDADDR: |
Hisao Tanabe | 5a2b646 | 2014-04-27 19:03:45 +0900 | [diff] [blame] | 383 | if (optptr[2]+7 > optlen) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | pp_ptr = optptr + 2; |
| 385 | goto error; |
| 386 | } |
David S. Miller | 1160472 | 2012-07-04 16:13:17 -0700 | [diff] [blame] | 387 | if (rt) { |
Eric Dumazet | bf5e53e | 2012-07-04 22:30:09 +0000 | [diff] [blame] | 388 | spec_dst_fill(&spec_dst, skb); |
David S. Miller | 35ebf65 | 2012-06-28 03:59:11 -0700 | [diff] [blame] | 389 | memcpy(&optptr[optptr[2]-1], &spec_dst, 4); |
Chris Metcalf | 48bdf07 | 2011-05-29 10:55:44 +0000 | [diff] [blame] | 390 | timeptr = &optptr[optptr[2]+3]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | } |
| 392 | opt->ts_needaddr = 1; |
| 393 | opt->ts_needtime = 1; |
| 394 | optptr[2] += 8; |
| 395 | break; |
Weilong Chen | dd9b455 | 2013-12-31 15:11:28 +0800 | [diff] [blame] | 396 | case IPOPT_TS_PRESPEC: |
Hisao Tanabe | 5a2b646 | 2014-04-27 19:03:45 +0900 | [diff] [blame] | 397 | if (optptr[2]+7 > optlen) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | pp_ptr = optptr + 2; |
| 399 | goto error; |
| 400 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | { |
Al Viro | fd68322 | 2006-09-26 22:17:51 -0700 | [diff] [blame] | 402 | __be32 addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | memcpy(&addr, &optptr[optptr[2]-1], 4); |
Denis V. Lunev | 0e6bd4a | 2008-03-24 15:29:23 -0700 | [diff] [blame] | 404 | if (inet_addr_type(net, addr) == RTN_UNICAST) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | break; |
| 406 | if (skb) |
Chris Metcalf | 48bdf07 | 2011-05-29 10:55:44 +0000 | [diff] [blame] | 407 | timeptr = &optptr[optptr[2]+3]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | } |
| 409 | opt->ts_needtime = 1; |
| 410 | optptr[2] += 8; |
| 411 | break; |
Weilong Chen | dd9b455 | 2013-12-31 15:11:28 +0800 | [diff] [blame] | 412 | default: |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 413 | if (!skb && !ns_capable(net->user_ns, CAP_NET_RAW)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | pp_ptr = optptr + 3; |
| 415 | goto error; |
| 416 | } |
| 417 | break; |
| 418 | } |
| 419 | if (timeptr) { |
YOSHIFUJI Hideaki | f25c3d6 | 2008-04-21 02:34:08 -0700 | [diff] [blame] | 420 | struct timespec tv; |
Chris Metcalf | 48bdf07 | 2011-05-29 10:55:44 +0000 | [diff] [blame] | 421 | u32 midtime; |
YOSHIFUJI Hideaki | f25c3d6 | 2008-04-21 02:34:08 -0700 | [diff] [blame] | 422 | getnstimeofday(&tv); |
Chris Metcalf | 48bdf07 | 2011-05-29 10:55:44 +0000 | [diff] [blame] | 423 | midtime = (tv.tv_sec % 86400) * MSEC_PER_SEC + tv.tv_nsec / NSEC_PER_MSEC; |
| 424 | put_unaligned_be32(midtime, timeptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | opt->is_changed = 1; |
| 426 | } |
David Ward | fa2b04f | 2013-03-05 17:06:32 +0000 | [diff] [blame] | 427 | } else if ((optptr[3]&0xF) != IPOPT_TS_PRESPEC) { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 428 | unsigned int overflow = optptr[3]>>4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | if (overflow == 15) { |
| 430 | pp_ptr = optptr + 3; |
| 431 | goto error; |
| 432 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | if (skb) { |
| 434 | optptr[3] = (optptr[3]&0xF)|((overflow+1)<<4); |
| 435 | opt->is_changed = 1; |
| 436 | } |
| 437 | } |
David Ward | 4660c7f | 2013-03-11 10:43:39 +0000 | [diff] [blame] | 438 | opt->ts = optptr - iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | break; |
Weilong Chen | dd9b455 | 2013-12-31 15:11:28 +0800 | [diff] [blame] | 440 | case IPOPT_RA: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | if (optlen < 4) { |
| 442 | pp_ptr = optptr + 1; |
| 443 | goto error; |
| 444 | } |
| 445 | if (optptr[2] == 0 && optptr[3] == 0) |
| 446 | opt->router_alert = optptr - iph; |
| 447 | break; |
Weilong Chen | dd9b455 | 2013-12-31 15:11:28 +0800 | [diff] [blame] | 448 | case IPOPT_CIPSO: |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 449 | if ((!skb && !ns_capable(net->user_ns, CAP_NET_RAW)) || opt->cipso) { |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 450 | pp_ptr = optptr; |
| 451 | goto error; |
| 452 | } |
| 453 | opt->cipso = optptr - iph; |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 454 | if (cipso_v4_validate(skb, &optptr)) { |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 455 | pp_ptr = optptr; |
| 456 | goto error; |
| 457 | } |
| 458 | break; |
Weilong Chen | dd9b455 | 2013-12-31 15:11:28 +0800 | [diff] [blame] | 459 | case IPOPT_SEC: |
| 460 | case IPOPT_SID: |
| 461 | default: |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 462 | if (!skb && !ns_capable(net->user_ns, CAP_NET_RAW)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | pp_ptr = optptr; |
| 464 | goto error; |
| 465 | } |
| 466 | break; |
| 467 | } |
| 468 | l -= optlen; |
| 469 | optptr += optlen; |
| 470 | } |
| 471 | |
| 472 | eol: |
| 473 | if (!pp_ptr) |
| 474 | return 0; |
| 475 | |
| 476 | error: |
| 477 | if (skb) { |
| 478 | icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((pp_ptr-iph)<<24)); |
| 479 | } |
| 480 | return -EINVAL; |
| 481 | } |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 482 | EXPORT_SYMBOL(ip_options_compile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
| 484 | /* |
| 485 | * Undo all the changes done by ip_options_compile(). |
| 486 | */ |
| 487 | |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 488 | void ip_options_undo(struct ip_options *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | { |
| 490 | if (opt->srr) { |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 491 | unsigned char *optptr = opt->__data+opt->srr-sizeof(struct iphdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | memmove(optptr+7, optptr+3, optptr[1]-7); |
| 493 | memcpy(optptr+3, &opt->faddr, 4); |
| 494 | } |
| 495 | if (opt->rr_needaddr) { |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 496 | unsigned char *optptr = opt->__data+opt->rr-sizeof(struct iphdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | optptr[2] -= 4; |
| 498 | memset(&optptr[optptr[2]-1], 0, 4); |
| 499 | } |
| 500 | if (opt->ts) { |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 501 | unsigned char *optptr = opt->__data+opt->ts-sizeof(struct iphdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | if (opt->ts_needtime) { |
| 503 | optptr[2] -= 4; |
| 504 | memset(&optptr[optptr[2]-1], 0, 4); |
| 505 | if ((optptr[3]&0xF) == IPOPT_TS_PRESPEC) |
| 506 | optptr[2] -= 4; |
| 507 | } |
| 508 | if (opt->ts_needaddr) { |
| 509 | optptr[2] -= 4; |
| 510 | memset(&optptr[optptr[2]-1], 0, 4); |
| 511 | } |
| 512 | } |
| 513 | } |
| 514 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 515 | static struct ip_options_rcu *ip_options_get_alloc(const int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 517 | return kzalloc(sizeof(struct ip_options_rcu) + ((optlen + 3) & ~3), |
Mariusz Kozlowski | 3764070 | 2007-07-31 14:06:45 -0700 | [diff] [blame] | 518 | GFP_KERNEL); |
Arnaldo Carvalho de Melo | 4c6ea29 | 2005-08-16 19:46:48 -0300 | [diff] [blame] | 519 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 521 | static int ip_options_get_finish(struct net *net, struct ip_options_rcu **optp, |
| 522 | struct ip_options_rcu *opt, int optlen) |
Arnaldo Carvalho de Melo | 4c6ea29 | 2005-08-16 19:46:48 -0300 | [diff] [blame] | 523 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | while (optlen & 3) |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 525 | opt->opt.__data[optlen++] = IPOPT_END; |
| 526 | opt->opt.optlen = optlen; |
| 527 | if (optlen && ip_options_compile(net, &opt->opt, NULL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | kfree(opt); |
| 529 | return -EINVAL; |
| 530 | } |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 531 | kfree(*optp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | *optp = opt; |
| 533 | return 0; |
| 534 | } |
| 535 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 536 | int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, |
Denis V. Lunev | f2c4802 | 2008-03-24 15:29:55 -0700 | [diff] [blame] | 537 | unsigned char __user *data, int optlen) |
Arnaldo Carvalho de Melo | 4c6ea29 | 2005-08-16 19:46:48 -0300 | [diff] [blame] | 538 | { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 539 | struct ip_options_rcu *opt = ip_options_get_alloc(optlen); |
Arnaldo Carvalho de Melo | 4c6ea29 | 2005-08-16 19:46:48 -0300 | [diff] [blame] | 540 | |
| 541 | if (!opt) |
| 542 | return -ENOMEM; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 543 | if (optlen && copy_from_user(opt->opt.__data, data, optlen)) { |
Arnaldo Carvalho de Melo | 4c6ea29 | 2005-08-16 19:46:48 -0300 | [diff] [blame] | 544 | kfree(opt); |
| 545 | return -EFAULT; |
| 546 | } |
Denis V. Lunev | f2c4802 | 2008-03-24 15:29:55 -0700 | [diff] [blame] | 547 | return ip_options_get_finish(net, optp, opt, optlen); |
Arnaldo Carvalho de Melo | 4c6ea29 | 2005-08-16 19:46:48 -0300 | [diff] [blame] | 548 | } |
| 549 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 550 | int ip_options_get(struct net *net, struct ip_options_rcu **optp, |
Denis V. Lunev | f2c4802 | 2008-03-24 15:29:55 -0700 | [diff] [blame] | 551 | unsigned char *data, int optlen) |
Arnaldo Carvalho de Melo | 4c6ea29 | 2005-08-16 19:46:48 -0300 | [diff] [blame] | 552 | { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 553 | struct ip_options_rcu *opt = ip_options_get_alloc(optlen); |
Arnaldo Carvalho de Melo | 4c6ea29 | 2005-08-16 19:46:48 -0300 | [diff] [blame] | 554 | |
| 555 | if (!opt) |
| 556 | return -ENOMEM; |
| 557 | if (optlen) |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 558 | memcpy(opt->opt.__data, data, optlen); |
Denis V. Lunev | f2c4802 | 2008-03-24 15:29:55 -0700 | [diff] [blame] | 559 | return ip_options_get_finish(net, optp, opt, optlen); |
Arnaldo Carvalho de Melo | 4c6ea29 | 2005-08-16 19:46:48 -0300 | [diff] [blame] | 560 | } |
| 561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | void ip_forward_options(struct sk_buff *skb) |
| 563 | { |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 564 | struct ip_options *opt = &(IPCB(skb)->opt); |
| 565 | unsigned char *optptr; |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 566 | struct rtable *rt = skb_rtable(skb); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 567 | unsigned char *raw = skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
| 569 | if (opt->rr_needaddr) { |
| 570 | optptr = (unsigned char *)raw + opt->rr; |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 571 | ip_rt_get_source(&optptr[optptr[2]-5], skb, rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | opt->is_changed = 1; |
| 573 | } |
| 574 | if (opt->srr_is_hit) { |
| 575 | int srrptr, srrspace; |
| 576 | |
| 577 | optptr = raw + opt->srr; |
| 578 | |
Weilong Chen | a22318e | 2013-12-23 14:37:26 +0800 | [diff] [blame] | 579 | for ( srrptr = optptr[2], srrspace = optptr[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | srrptr <= srrspace; |
| 581 | srrptr += 4 |
| 582 | ) { |
| 583 | if (srrptr + 3 > srrspace) |
| 584 | break; |
Li Wei | ac8a481 | 2011-11-22 23:33:10 +0000 | [diff] [blame] | 585 | if (memcmp(&opt->nexthop, &optptr[srrptr-1], 4) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | break; |
| 587 | } |
| 588 | if (srrptr + 3 <= srrspace) { |
| 589 | opt->is_changed = 1; |
Li Wei | ac8a481 | 2011-11-22 23:33:10 +0000 | [diff] [blame] | 590 | ip_hdr(skb)->daddr = opt->nexthop; |
Li Wei | 5dc7883 | 2012-02-09 21:15:25 +0000 | [diff] [blame] | 591 | ip_rt_get_source(&optptr[srrptr-1], skb, rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | optptr[2] = srrptr+4; |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 593 | } else { |
| 594 | net_crit_ratelimited("%s(): Argh! Destination lost!\n", |
| 595 | __func__); |
| 596 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | if (opt->ts_needaddr) { |
| 598 | optptr = raw + opt->ts; |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 599 | ip_rt_get_source(&optptr[optptr[2]-9], skb, rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | opt->is_changed = 1; |
| 601 | } |
| 602 | } |
| 603 | if (opt->is_changed) { |
| 604 | opt->is_changed = 0; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 605 | ip_send_check(ip_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | } |
| 607 | } |
| 608 | |
| 609 | int ip_options_rcv_srr(struct sk_buff *skb) |
| 610 | { |
| 611 | struct ip_options *opt = &(IPCB(skb)->opt); |
| 612 | int srrspace, srrptr; |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 613 | __be32 nexthop; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 614 | struct iphdr *iph = ip_hdr(skb); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 615 | unsigned char *optptr = skb_network_header(skb) + opt->srr; |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 616 | struct rtable *rt = skb_rtable(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | struct rtable *rt2; |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 618 | unsigned long orefdst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | int err; |
| 620 | |
David S. Miller | 1094955 | 2011-05-12 19:26:57 -0400 | [diff] [blame] | 621 | if (!rt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | return 0; |
| 623 | |
| 624 | if (skb->pkt_type != PACKET_HOST) |
| 625 | return -EINVAL; |
| 626 | if (rt->rt_type == RTN_UNICAST) { |
| 627 | if (!opt->is_strictroute) |
| 628 | return 0; |
| 629 | icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl(16<<24)); |
| 630 | return -EINVAL; |
| 631 | } |
| 632 | if (rt->rt_type != RTN_LOCAL) |
| 633 | return -EINVAL; |
| 634 | |
Weilong Chen | a22318e | 2013-12-23 14:37:26 +0800 | [diff] [blame] | 635 | for (srrptr = optptr[2], srrspace = optptr[1]; srrptr <= srrspace; srrptr += 4) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | if (srrptr + 3 > srrspace) { |
| 637 | icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((opt->srr+2)<<24)); |
| 638 | return -EINVAL; |
| 639 | } |
| 640 | memcpy(&nexthop, &optptr[srrptr-1], 4); |
| 641 | |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 642 | orefdst = skb->_skb_refdst; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 643 | skb_dst_set(skb, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | err = ip_route_input(skb, nexthop, iph->saddr, iph->tos, skb->dev); |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 645 | rt2 = skb_rtable(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | if (err || (rt2->rt_type != RTN_UNICAST && rt2->rt_type != RTN_LOCAL)) { |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 647 | skb_dst_drop(skb); |
| 648 | skb->_skb_refdst = orefdst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | return -EINVAL; |
| 650 | } |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 651 | refdst_drop(orefdst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | if (rt2->rt_type != RTN_LOCAL) |
| 653 | break; |
| 654 | /* Superfast 8) loopback forward */ |
David S. Miller | c30883b | 2011-05-12 19:30:58 -0400 | [diff] [blame] | 655 | iph->daddr = nexthop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | opt->is_changed = 1; |
| 657 | } |
| 658 | if (srrptr <= srrspace) { |
| 659 | opt->srr_is_hit = 1; |
Li Wei | ac8a481 | 2011-11-22 23:33:10 +0000 | [diff] [blame] | 660 | opt->nexthop = nexthop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | opt->is_changed = 1; |
| 662 | } |
| 663 | return 0; |
| 664 | } |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 665 | EXPORT_SYMBOL(ip_options_rcv_srr); |