[IPV6]: Support several new sockopt / ancillary data in Advanced API (RFC3542).

Support several new socket options / ancillary data:
  IPV6_RECVPKTINFO, IPV6_PKTINFO,
  IPV6_RECVHOPOPTS, IPV6_HOPOPTS,
  IPV6_RECVDSTOPTS, IPV6_DSTOPTS, IPV6_RTHDRDSTOPTS,
  IPV6_RECVRTHDR, IPV6_RTHDR,
  IPV6_RECVHOPOPTS, IPV6_HOPOPTS

Old semantics are preserved as IPV6_2292xxxx so that
we can maintain backward compatibility.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

10 files changed, 423 insertions, 49 deletions

diff --git a/include/linux/in6.h b/include/linux/in6.h
index dcf5720..c11022f 100644
--- a/include/linux/in6.h
+++ b/include/linux/in6.h
@@ -148,13 +148,13 @@ struct in6_flowlabel_req
  */
 
 #define IPV6_ADDRFORM		1
-#define IPV6_PKTINFO		2
-#define IPV6_HOPOPTS		3
-#define IPV6_DSTOPTS		4
-#define IPV6_RTHDR		5
-#define IPV6_PKTOPTIONS		6
+#define IPV6_2292PKTINFO	2
+#define IPV6_2292HOPOPTS	3
+#define IPV6_2292DSTOPTS	4
+#define IPV6_2292RTHDR		5
+#define IPV6_2292PKTOPTIONS	6
 #define IPV6_CHECKSUM		7
-#define IPV6_HOPLIMIT		8
+#define IPV6_2292HOPLIMIT	8
 #define IPV6_NEXTHOP		9
 #define IPV6_AUTHHDR		10	/* obsolete */
 #define IPV6_FLOWINFO		11
@@ -198,4 +198,30 @@ struct in6_flowlabel_req
  * MCAST_MSFILTER		48
  */
 
+/* RFC3542 advanced socket options (50-67) */
+#define IPV6_RECVPKTINFO	50
+#define IPV6_PKTINFO		51
+#if 0
+#define IPV6_RECVPATHMTU	52
+#define IPV6_PATHMTU		53
+#define IPV6_DONTFRAG		54
+#define IPV6_USE_MIN_MTU	55
+#endif
+#define IPV6_RECVHOPOPTS	56
+#define IPV6_HOPOPTS		57
+#if 0
+#define IPV6_RECVRTHDRDSTOPTS	58	/* Unused, see net/ipv6/datagram.c */
+#endif
+#define IPV6_RTHDRDSTOPTS	59
+#define IPV6_RECVRTHDR		60
+#define IPV6_RTHDR		61
+#define IPV6_RECVDSTOPTS	62
+#define IPV6_DSTOPTS		63
+#define IPV6_RECVHOPLIMIT	64
+#define IPV6_HOPLIMIT		65
+#if 0
+#define IPV6_RECVTCLASS		66
+#define IPV6_TCLASS		67
+#endif
+
 #endif
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 3c7dbc6..2581f1c 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -189,6 +189,7 @@ struct inet6_skb_parm {
 	__u16			dst0;
 	__u16			srcrt;
 	__u16			dst1;
+	__u16			lastopt;
 };
 
 #define IP6CB(skb)	((struct inet6_skb_parm*)((skb)->cb))
@@ -234,14 +235,19 @@ struct ipv6_pinfo {
 	/* pktoption flags */
 	union {
 		struct {
-			__u8	srcrt:2,
+			__u16	srcrt:2,
+				osrcrt:2,
 			        rxinfo:1,
+			        rxoinfo:1,
 				rxhlim:1,
+				rxohlim:1,
 				hopopts:1,
+				ohopopts:1,
 				dstopts:1,
+				odstopts:1,
                                 rxflow:1;
 		} bits;
-		__u8		all;
+		__u16		all;
 	} rxopt;
 
 	/* sockopt flags */
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 3203eaf..8a9fe94 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -233,6 +233,10 @@ extern int 			ip6_ra_control(struct sock *sk, int sel,
 extern int			ipv6_parse_hopopts(struct sk_buff *skb, int);
 
 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
+extern struct ipv6_txoptions *	ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
+						   int newtype,
+						   struct ipv6_opt_hdr __user *newopt,
+						   int newoptlen);
 
 extern int ip6_frag_nqueues;
 extern atomic_t ip6_frag_mem;
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index 01468fa..832476b 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -394,21 +394,85 @@ int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
 		u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
 		put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
 	}
+
+	/* HbH is allowed only once */
 	if (np->rxopt.bits.hopopts && opt->hop) {
 		u8 *ptr = skb->nh.raw + opt->hop;
 		put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
 	}
-	if (np->rxopt.bits.dstopts && opt->dst0) {
+
+	if (opt->lastopt &&
+	    (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
+		/*
+		 * Silly enough, but we need to reparse in order to
+		 * report extension headers (except for HbH)
+		 * in order.
+		 *
+		 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 
+		 * (and WILL NOT be) defined because
+		 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
+		 */
+		unsigned int off = sizeof(struct ipv6hdr);
+		u8 nexthdr = skb->nh.ipv6h->nexthdr;
+
+		while (off <= opt->lastopt) {
+			unsigned len;
+			u8 *ptr = skb->nh.raw + off;
+
+			switch(nexthdr) {
+			case IPPROTO_DSTOPTS:
+				nexthdr = ptr[0];
+				len = (ptr[1] + 1) << 3;
+				if (np->rxopt.bits.dstopts)
+					put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
+				break;
+			case IPPROTO_ROUTING:
+				nexthdr = ptr[0];
+				len = (ptr[1] + 1) << 3;
+				if (np->rxopt.bits.srcrt)
+					put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
+				break;
+			case IPPROTO_AH:
+				nexthdr = ptr[0];
+				len = (ptr[1] + 1) << 2;
+				break;
+			default:
+				nexthdr = ptr[0];
+				len = (ptr[1] + 1) << 3;
+				break;
+			}
+
+			off += len;
+		}
+	}
+
+	/* socket options in old style */
+	if (np->rxopt.bits.rxoinfo) {
+		struct in6_pktinfo src_info;
+
+		src_info.ipi6_ifindex = opt->iif;
+		ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
+		put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
+	}
+	if (np->rxopt.bits.rxohlim) {
+		int hlim = skb->nh.ipv6h->hop_limit;
+		put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
+	}
+	if (np->rxopt.bits.ohopopts && opt->hop) {
+		u8 *ptr = skb->nh.raw + opt->hop;
+		put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
+	}
+	if (np->rxopt.bits.odstopts && opt->dst0) {
 		u8 *ptr = skb->nh.raw + opt->dst0;
-		put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);
+		put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
 	}
-	if (np->rxopt.bits.srcrt && opt->srcrt) {
+	if (np->rxopt.bits.osrcrt && opt->srcrt) {
 		struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
-		put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
+		put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
 	}
-	if (np->rxopt.bits.dstopts && opt->dst1) {
+	if (np->rxopt.bits.odstopts && opt->dst1) {
 		u8 *ptr = skb->nh.raw + opt->dst1;
-		put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);
+		put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
 	}
 	return 0;
 }
@@ -438,6 +502,7 @@ int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
 
 		switch (cmsg->cmsg_type) {
  		case IPV6_PKTINFO:
+ 		case IPV6_2292PKTINFO:
  			if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
 				err = -EINVAL;
 				goto exit_f;
@@ -492,6 +557,7 @@ int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
 			fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg);
 			break;
 
+		case IPV6_2292HOPOPTS:
 		case IPV6_HOPOPTS:
                         if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
 				err = -EINVAL;
@@ -512,7 +578,7 @@ int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
 			opt->hopopt = hdr;
 			break;
 
-		case IPV6_DSTOPTS:
+		case IPV6_2292DSTOPTS:
                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
 				err = -EINVAL;
 				goto exit_f;
@@ -536,6 +602,33 @@ int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
 			opt->dst1opt = hdr;
 			break;
 
+		case IPV6_DSTOPTS:
+		case IPV6_RTHDRDSTOPTS:
+			if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
+				err = -EINVAL;
+				goto exit_f;
+			}
+
+			hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
+			len = ((hdr->hdrlen + 1) << 3);
+			if (cmsg->cmsg_len < CMSG_LEN(len)) {
+				err = -EINVAL;
+				goto exit_f;
+			}
+			if (!capable(CAP_NET_RAW)) {
+				err = -EPERM;
+				goto exit_f;
+			}
+			if (cmsg->cmsg_type == IPV6_DSTOPTS) {
+				opt->opt_flen += len;
+				opt->dst1opt = hdr;
+			} else {
+				opt->opt_nflen += len;
+				opt->dst0opt = hdr;
+			}
+			break;
+
+		case IPV6_2292RTHDR:
 		case IPV6_RTHDR:
                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
 				err = -EINVAL;
@@ -568,7 +661,7 @@ int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
 			opt->opt_nflen += len;
 			opt->srcrt = rthdr;
 
-			if (opt->dst1opt) {
+			if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
 				int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
 
 				opt->opt_nflen += dsthdrlen;
@@ -579,6 +672,7 @@ int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
 
 			break;
 
+		case IPV6_2292HOPLIMIT:
 		case IPV6_HOPLIMIT:
 			if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
 				err = -EINVAL;
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index 5be6da2..ffcda45 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -164,6 +164,7 @@ static int ipv6_destopt_rcv(struct sk_buff **skbp, unsigned int *nhoffp)
 		return -1;
 	}
 
+	opt->lastopt = skb->h.raw - skb->nh.raw;
 	opt->dst1 = skb->h.raw - skb->nh.raw;
 
 	if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) {
@@ -243,6 +244,7 @@ static int ipv6_rthdr_rcv(struct sk_buff **skbp, unsigned int *nhoffp)
 
 looped_back:
 	if (hdr->segments_left == 0) {
+		opt->lastopt = skb->h.raw - skb->nh.raw;
 		opt->srcrt = skb->h.raw - skb->nh.raw;
 		skb->h.raw += (hdr->hdrlen + 1) << 3;
 		opt->dst0 = opt->dst1;
@@ -539,10 +541,15 @@ void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
 			  u8 *proto,
 			  struct in6_addr **daddr)
 {
-	if (opt->srcrt)
+	if (opt->srcrt) {
 		ipv6_push_rthdr(skb, proto, opt->srcrt, daddr);
-	if (opt->dst0opt)
-		ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt);
+		/*
+		 * IPV6_RTHDRDSTOPTS is ignored
+		 * unless IPV6_RTHDR is set (RFC3542).
+		 */
+		if (opt->dst0opt)
+			ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt);
+	}
 	if (opt->hopopt)
 		ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt);
 }
@@ -573,3 +580,97 @@ ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt)
 	}
 	return opt2;
 }
+
+static int ipv6_renew_option(void *ohdr,
+			     struct ipv6_opt_hdr __user *newopt, int newoptlen,
+			     int inherit,
+			     struct ipv6_opt_hdr **hdr,
+			     char **p)
+{
+	if (inherit) {
+		if (ohdr) {
+			memcpy(*p, ohdr, ipv6_optlen((struct ipv6_opt_hdr *)ohdr));
+			*hdr = (struct ipv6_opt_hdr *)*p;
+			*p += CMSG_ALIGN(ipv6_optlen(*(struct ipv6_opt_hdr **)hdr));
+		}
+	} else {
+		if (newopt) {
+			if (copy_from_user(*p, newopt, newoptlen))
+				return -EFAULT;
+			*hdr = (struct ipv6_opt_hdr *)*p;
+			if (ipv6_optlen(*(struct ipv6_opt_hdr **)hdr) > newoptlen)
+				return -EINVAL;
+			*p += CMSG_ALIGN(newoptlen);
+		}
+	}
+	return 0;
+}
+
+struct ipv6_txoptions *
+ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
+		   int newtype,
+		   struct ipv6_opt_hdr __user *newopt, int newoptlen)
+{
+	int tot_len = 0;
+	char *p;
+	struct ipv6_txoptions *opt2;
+	int err;
+
+	if (newtype != IPV6_HOPOPTS && opt->hopopt)
+		tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt));
+	if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt)
+		tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt));
+	if (newtype != IPV6_RTHDR && opt->srcrt)
+		tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt));
+	if (newtype != IPV6_DSTOPTS && opt->dst1opt)
+		tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt));
+	if (newopt && newoptlen)
+		tot_len += CMSG_ALIGN(newoptlen);
+
+	if (!tot_len)
+		return NULL;
+
+	opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC);
+	if (!opt2)
+		return ERR_PTR(-ENOBUFS);
+
+	memset(opt2, 0, tot_len);
+
+	opt2->tot_len = tot_len;
+	p = (char *)(opt2 + 1);
+
+	err = ipv6_renew_option(opt->hopopt, newopt, newoptlen,
+				newtype != IPV6_HOPOPTS,
+				&opt2->hopopt, &p);
+	if (err)
+		goto out;
+
+	err = ipv6_renew_option(opt->dst0opt, newopt, newoptlen,
+				newtype != IPV6_RTHDRDSTOPTS,
+				&opt2->dst0opt, &p);
+	if (err)
+		goto out;
+
+	err = ipv6_renew_option(opt->srcrt, newopt, newoptlen,
+				newtype != IPV6_RTHDR,
+				(struct ipv6_opt_hdr **)opt2->srcrt, &p);
+	if (err)
+		goto out;
+
+	err = ipv6_renew_option(opt->dst1opt, newopt, newoptlen,
+				newtype != IPV6_DSTOPTS,
+				&opt2->dst1opt, &p);
+	if (err)
+		goto out;
+
+	opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) +
+			  (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) +
+			  (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0);
+	opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0);
+
+	return opt2;
+out:
+	sock_kfree_s(sk, p, tot_len);
+	return ERR_PTR(err);
+}
+
diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index b6c73da5..2d5ce37 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -225,16 +225,20 @@ struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
 					 struct ip6_flowlabel * fl,
 					 struct ipv6_txoptions * fopt)
 {
-	struct ipv6_txoptions * fl_opt = fl->opt;
+	struct ipv6_txoptions * fl_opt = fl ? fl->opt : NULL;
 
-	if (fopt == NULL || fopt->opt_flen == 0)
-		return fl_opt;
+	if (fopt == NULL || fopt->opt_flen == 0) {
+		if (!fl_opt || !fl_opt->dst0opt || fl_opt->srcrt)
+			return fl_opt;
+	}
 
 	if (fl_opt != NULL) {
 		opt_space->hopopt = fl_opt->hopopt;
-		opt_space->dst0opt = fl_opt->dst0opt;
+		opt_space->dst0opt = fl_opt->srcrt ? fl_opt->dst0opt : NULL;
 		opt_space->srcrt = fl_opt->srcrt;
 		opt_space->opt_nflen = fl_opt->opt_nflen;
+		if (fl_opt->dst0opt && !fl_opt->srcrt)
+			opt_space->opt_nflen -= ipv6_optlen(fl_opt->dst0opt);
 	} else {
 		if (fopt->opt_nflen == 0)
 			return fopt;
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 76466af..dc1d991 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -210,39 +210,127 @@ int ipv6_setsockopt(struct sock *sk, int level, int optname,
 		retv = 0;
 		break;
 
-	case IPV6_PKTINFO:
+	case IPV6_RECVPKTINFO:
 		np->rxopt.bits.rxinfo = valbool;
 		retv = 0;
 		break;
+		
+	case IPV6_2292PKTINFO:
+		np->rxopt.bits.rxoinfo = valbool;
+		retv = 0;
+		break;
 
-	case IPV6_HOPLIMIT:
+	case IPV6_RECVHOPLIMIT:
 		np->rxopt.bits.rxhlim = valbool;
 		retv = 0;
 		break;
 
-	case IPV6_RTHDR:
+	case IPV6_2292HOPLIMIT:
+		np->rxopt.bits.rxohlim = valbool;
+		retv = 0;
+		break;
+
+	case IPV6_RECVRTHDR:
 		if (val < 0 || val > 2)
 			goto e_inval;
 		np->rxopt.bits.srcrt = val;
 		retv = 0;
 		break;
 
-	case IPV6_HOPOPTS:
+	case IPV6_2292RTHDR:
+		if (val < 0 || val > 2)
+			goto e_inval;
+		np->rxopt.bits.osrcrt = val;
+		retv = 0;
+		break;
+
+	case IPV6_RECVHOPOPTS:
 		np->rxopt.bits.hopopts = valbool;
 		retv = 0;
 		break;
 
-	case IPV6_DSTOPTS:
+	case IPV6_2292HOPOPTS:
+		np->rxopt.bits.ohopopts = valbool;
+		retv = 0;
+		break;
+
+	case IPV6_RECVDSTOPTS:
 		np->rxopt.bits.dstopts = valbool;
 		retv = 0;
 		break;
 
+	case IPV6_2292DSTOPTS:
+		np->rxopt.bits.odstopts = valbool;
+		retv = 0;
+		break;
+
 	case IPV6_FLOWINFO:
 		np->rxopt.bits.rxflow = valbool;
 		retv = 0;
 		break;
 
-	case IPV6_PKTOPTIONS:
+	case IPV6_HOPOPTS:
+	case IPV6_RTHDRDSTOPTS:
+	case IPV6_RTHDR:
+	case IPV6_DSTOPTS:
+	{
+		struct ipv6_txoptions *opt;
+		if (optlen == 0)
+			optval = 0;
+
+		/* hop-by-hop / destination options are privileged option */
+		retv = -EPERM;
+		if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
+			break;
+
+		retv = -EINVAL;
+		if (optlen & 0x7 || optlen > 8 * 255)
+			break;
+
+		opt = ipv6_renew_options(sk, np->opt, optname,
+					 (struct ipv6_opt_hdr __user *)optval,
+					 optlen);
+		if (IS_ERR(opt)) {
+			retv = PTR_ERR(opt);
+			break;
+		}
+
+		/* routing header option needs extra check */
+		if (optname == IPV6_RTHDR && opt->srcrt) {
+			struct ipv6_rt_hdr *rthdr = opt->srcrt;
+			if (rthdr->type)
+				goto sticky_done;
+			if ((rthdr->hdrlen & 1) ||
+			    (rthdr->hdrlen >> 1) != rthdr->segments_left)
+				goto sticky_done;
+		}
+
+		retv = 0;
+		if (sk->sk_type == SOCK_STREAM) {
+			if (opt) {
+				struct tcp_sock *tp = tcp_sk(sk);
+				if (!((1 << sk->sk_state) &
+				      (TCPF_LISTEN | TCPF_CLOSE))
+				    && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
+					tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
+					tcp_sync_mss(sk, tp->pmtu_cookie);
+				}
+			}
+			opt = xchg(&np->opt, opt);
+			sk_dst_reset(sk);
+		} else {
+			write_lock(&sk->sk_dst_lock);
+			opt = xchg(&np->opt, opt);
+			write_unlock(&sk->sk_dst_lock);
+			sk_dst_reset(sk);
+		}
+sticky_done:
+		if (opt)
+			sock_kfree_s(sk, opt, opt->tot_len);
+		break;
+	}
+
+	case IPV6_2292PKTOPTIONS:
 	{
 		struct ipv6_txoptions *opt = NULL;
 		struct msghdr msg;
@@ -529,6 +617,17 @@ e_inval:
 	return -EINVAL;
 }
 
+int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
+			   char __user *optval, int len)
+{
+	if (!hdr)
+		return 0;
+	len = min_t(int, len, ipv6_optlen(hdr));
+	if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
+		return -EFAULT;
+	return len;
+}
+
 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 		    char __user *optval, int __user *optlen)
 {
@@ -567,7 +666,7 @@ int ipv6_getsockopt(struct sock *sk, int level, int optname,
 		return err;
 	}
 
-	case IPV6_PKTOPTIONS:
+	case IPV6_2292PKTOPTIONS:
 	{
 		struct msghdr msg;
 		struct sk_buff *skb;
@@ -601,6 +700,16 @@ int ipv6_getsockopt(struct sock *sk, int level, int optname,
 				int hlim = np->mcast_hops;
 				put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 			}
+			if (np->rxopt.bits.rxoinfo) {
+				struct in6_pktinfo src_info;
+				src_info.ipi6_ifindex = np->mcast_oif;
+				ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
+				put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
+			}
+			if (np->rxopt.bits.rxohlim) {
+				int hlim = np->mcast_hops;
+				put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
+			}
 		}
 		len -= msg.msg_controllen;
 		return put_user(len, optlen);
@@ -625,26 +734,59 @@ int ipv6_getsockopt(struct sock *sk, int level, int optname,
 		val = np->ipv6only;
 		break;
 
-	case IPV6_PKTINFO:
+	case IPV6_RECVPKTINFO:
 		val = np->rxopt.bits.rxinfo;
 		break;
 
-	case IPV6_HOPLIMIT:
+	case IPV6_2292PKTINFO:
+		val = np->rxopt.bits.rxoinfo;
+		break;
+
+	case IPV6_RECVHOPLIMIT:
 		val = np->rxopt.bits.rxhlim;
 		break;
 
-	case IPV6_RTHDR:
+	case IPV6_2292HOPLIMIT:
+		val = np->rxopt.bits.rxohlim;
+		break;
+
+	case IPV6_RECVRTHDR:
 		val = np->rxopt.bits.srcrt;
 		break;
 
+	case IPV6_2292RTHDR:
+		val = np->rxopt.bits.osrcrt;
+		break;
+
 	case IPV6_HOPOPTS:
+	case IPV6_RTHDRDSTOPTS:
+	case IPV6_RTHDR:
+	case IPV6_DSTOPTS:
+	{
+
+		lock_sock(sk);
+		len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
+					     optval, len);
+		release_sock(sk);
+		return put_user(len, optlen);
+	}
+
+	case IPV6_RECVHOPOPTS:
 		val = np->rxopt.bits.hopopts;
 		break;
 
-	case IPV6_DSTOPTS:
+	case IPV6_2292HOPOPTS:
+		val = np->rxopt.bits.ohopopts;
+		break;
+
+	case IPV6_RECVDSTOPTS:
 		val = np->rxopt.bits.dstopts;
 		break;
 
+	case IPV6_2292DSTOPTS:
+		val = np->rxopt.bits.odstopts;
+		break;
+
 	case IPV6_FLOWINFO:
 		val = np->rxopt.bits.rxflow;
 		break;
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index ed3a76b..e527a16 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -755,8 +755,7 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
 	}
 	if (opt == NULL)
 		opt = np->opt;
-	if (flowlabel)
-		opt = fl6_merge_options(&opt_space, flowlabel, opt);
+	opt = fl6_merge_options(&opt_space, flowlabel, opt);
 
 	fl.proto = proto;
 	rawv6_probe_proto_opt(&fl, msg);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 794734f..246414b 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -849,7 +849,7 @@ static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
 	if (dst == NULL) {
 		opt = np->opt;
 		if (opt == NULL &&
-		    np->rxopt.bits.srcrt == 2 &&
+		    np->rxopt.bits.osrcrt == 2 &&
 		    treq->pktopts) {
 			struct sk_buff *pktopts = treq->pktopts;
 			struct inet6_skb_parm *rxopt = IP6CB(pktopts);
@@ -915,11 +915,10 @@ static int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 	struct inet6_skb_parm *opt = IP6CB(skb);
 
 	if (np->rxopt.all) {
-		if ((opt->hop && np->rxopt.bits.hopopts) ||
-		    ((IPV6_FLOWINFO_MASK&*(u32*)skb->nh.raw) &&
-		     np->rxopt.bits.rxflow) ||
-		    (opt->srcrt && np->rxopt.bits.srcrt) ||
-		    ((opt->dst1 || opt->dst0) && np->rxopt.bits.dstopts))
+		if ((opt->hop && (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
+		    ((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) && np->rxopt.bits.rxflow) ||
+		    (opt->srcrt && (np->rxopt.bits.srcrt || np->rxopt.bits.osrcrt)) ||
+		    ((opt->dst1 || opt->dst0) && (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 			return 1;
 	}
 	return 0;
@@ -1190,8 +1189,8 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 	TCP_ECN_create_request(req, skb->h.th);
 	treq->pktopts = NULL;
 	if (ipv6_opt_accepted(sk, skb) ||
-	    np->rxopt.bits.rxinfo ||
-	    np->rxopt.bits.rxhlim) {
+	    np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
+	    np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 		atomic_inc(&skb->users);
 		treq->pktopts = skb;
 	}
@@ -1288,7 +1287,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 	if (sk_acceptq_is_full(sk))
 		goto out_overflow;
 
-	if (np->rxopt.bits.srcrt == 2 &&
+	if (np->rxopt.bits.osrcrt == 2 &&
 	    opt == NULL && treq->pktopts) {
 		struct inet6_skb_parm *rxopt = IP6CB(treq->pktopts);
 		if (rxopt->srcrt)
@@ -1544,9 +1543,9 @@ ipv6_pktoptions:
 	tp = tcp_sk(sk);
 	if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
 	    !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
-		if (np->rxopt.bits.rxinfo)
+		if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
 			np->mcast_oif = inet6_iif(opt_skb);
-		if (np->rxopt.bits.rxhlim)
+		if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
 			np->mcast_hops = opt_skb->nh.ipv6h->hop_limit;
 		if (ipv6_opt_accepted(sk, opt_skb)) {
 			skb_set_owner_r(opt_skb, sk);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 390d750..aa6eaf3 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -773,8 +773,7 @@ do_udp_sendmsg:
 	}
 	if (opt == NULL)
 		opt = np->opt;
-	if (flowlabel)
-		opt = fl6_merge_options(&opt_space, flowlabel, opt);
+	opt = fl6_merge_options(&opt_space, flowlabel, opt);
 
 	fl->proto = IPPROTO_UDP;
 	ipv6_addr_copy(&fl->fl6_dst, daddr);