net/ipv4/ip_options.c

44 void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
49 	memcpy(&(IPCB(skb)->opt), opt, sizeof(struct ip_options));
50 	memcpy(iph + sizeof(struct iphdr), opt->__data, opt->optlen);
51 	opt = &(IPCB(skb)->opt);
53 	if (opt->srr)
54 		memcpy(iph + opt->srr + iph[opt->srr + 1] - 4, &daddr, 4);
56 	if (opt->rr_needaddr)
57 		ip_rt_get_source(iph + opt->rr + iph[opt->rr + 2] - 5, skb, rt);
58 	if (opt->ts_needaddr)
59 		ip_rt_get_source(iph + opt->ts + iph[opt->ts + 2] - 9, skb, rt);
60 	if (opt->ts_needtime) {
64 		memcpy(iph + opt->ts + iph[opt->ts + 2] - 5, &midtime, 4);
198 	struct ip_options *opt = &(IPCB(skb)->opt);
199 	int  l = opt->optlen;
219 	opt->ts = 0;
220 	opt->rr = 0;
221 	opt->rr_needaddr = 0;
222 	opt->ts_needaddr = 0;
223 	opt->ts_needtime = 0;
237  * Caller should clear *opt, and set opt->data.
238  * If opt == NULL, then skb->data should point to IP header.
242 			 struct ip_options *opt, struct sk_buff *skb,
256 		optptr = opt->__data;
259 	for (l = opt->optlen; l > 0; ) {
265 					opt->is_changed = 1;
295 			if (opt->srr) {
304 				memcpy(&opt->faddr, &optptr[3], 4);
308 			opt->is_strictroute = (optptr[0] == IPOPT_SSRR);
309 			opt->srr = optptr - iph;
312 			if (opt->rr) {
332 					opt->is_changed = 1;
335 				opt->rr_needaddr = 1;
337 			opt->rr = optptr - iph;
340 			if (opt->ts) {
362 					opt->ts_needtime = 1;
375 					opt->ts_needaddr = 1;
376 					opt->ts_needtime = 1;
392 					opt->ts_needtime = 1;
407 					opt->is_changed = 1;
417 					opt->is_changed = 1;
420 			opt->ts = optptr - iph;
428 				opt->router_alert = optptr - iph;
431 			if ((!skb && !ns_capable(net->user_ns, CAP_NET_RAW)) || opt->cipso) {
435 			opt->cipso = optptr - iph;
466 		       struct ip_options *opt, struct sk_buff *skb)
471 	ret = __ip_options_compile(net, opt, skb, &info);
482 void ip_options_undo(struct ip_options *opt)
484 	if (opt->srr) {
485 		unsigned char *optptr = opt->__data + opt->srr - sizeof(struct iphdr);
488 		memcpy(optptr + 3, &opt->faddr, 4);
490 	if (opt->rr_needaddr) {
491 		unsigned char *optptr = opt->__data + opt->rr - sizeof(struct iphdr);
496 	if (opt->ts) {
497 		unsigned char *optptr = opt->__data + opt->ts - sizeof(struct iphdr);
499 		if (opt->ts_needtime) {
505 		if (opt->ts_needaddr) {
515 	struct ip_options_rcu *opt;
517 	opt = kzalloc(sizeof(struct ip_options_rcu) + ((optlen + 3) & ~3),
519 	if (!opt)
521 	if (optlen && copy_from_sockptr(opt->opt.__data, data, optlen)) {
522 		kfree(opt);
527 		opt->opt.__data[optlen++] = IPOPT_END;
528 	opt->opt.optlen = optlen;
529 	if (optlen && ip_options_compile(net, &opt->opt, NULL)) {
530 		kfree(opt);
534 	*optp = opt;
540 	struct   ip_options *opt	= &(IPCB(skb)->opt);
545 	if (opt->rr_needaddr) {
546 		optptr = (unsigned char *)raw + opt->rr;
548 		opt->is_changed = 1;
550 	if (opt->srr_is_hit) {
553 		optptr = raw + opt->srr;
561 			if (memcmp(&opt->nexthop, &optptr[srrptr-1], 4) == 0)
565 			opt->is_changed = 1;
566 			ip_hdr(skb)->daddr = opt->nexthop;
573 		if (opt->ts_needaddr) {
574 			optptr = raw + opt->ts;
576 			opt->is_changed = 1;
579 	if (opt->is_changed) {
580 		opt->is_changed = 0;
587 	struct ip_options *opt = &(IPCB(skb)->opt);
591 	unsigned char *optptr = skb_network_header(skb) + opt->srr;
603 		if (!opt->is_strictroute)
613 			icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((opt->srr+2)<<24));
632 		opt->is_changed = 1;
635 		opt->srr_is_hit = 1;
636 		opt->nexthop = nexthop;
637 		opt->is_changed = 1;