[IPV6]: Do not send RH0 anymore.

Based on <draft-ietf-ipv6-deprecate-rh0-00.txt>.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

8 files changed, 5 insertions, 130 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index af6a63ab9026..09c184e41cf8 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -874,8 +874,7 @@ accept_redirects - BOOLEAN
 accept_source_route - INTEGER
         Accept source routing (routing extension header).
 
-        > 0: Accept routing header.
-        = 0: Accept only routing header type 2.
+        >= 0: Accept only routing header type 2.
         < 0: Do not accept routing header.
 
         Default: 0
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 213b63be3c8f..cb3118cf277c 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -27,8 +27,8 @@ struct in6_ifreq {
         int             ifr6_ifindex; 
 };
 
-#define IPV6_SRCRT_STRICT       0x01    /* this hop must be a neighbor  */
-#define IPV6_SRCRT_TYPE_0       0       /* IPv6 type 0 Routing Header   */
+#define IPV6_SRCRT_STRICT       0x01    /* Deprecated; will be removed */
+#define IPV6_SRCRT_TYPE_0       0       /* Deprecated; will be removed */
 #define IPV6_SRCRT_TYPE_2       2       /* IPv6 type 2 Routing Header   */
 
 /*
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 78a0d06d98d5..46b9dce82f6e 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -512,10 +512,6 @@ extern int 			ipv6_ext_hdr(u8 nexthdr);
 
 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
 
-extern struct ipv6_txoptions *  ipv6_invert_rthdr(struct sock *sk,
-                                                  struct ipv6_rt_hdr *hdr);
-
-
 /*
  *      socket options (ipv6_sockglue.c)
  */
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 31737cdf156a..b158c661867b 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -253,17 +253,6 @@ static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
 
         if (dst == NULL) {
                 opt = np->opt;
-                if (opt == NULL &&
-                    np->rxopt.bits.osrcrt == 2 &&
-                    ireq6->pktopts) {
-                        struct sk_buff *pktopts = ireq6->pktopts;
-                        struct inet6_skb_parm *rxopt = IP6CB(pktopts);
-
-                        if (rxopt->srcrt)
-                                opt = ipv6_invert_rthdr(sk,
-                          (struct ipv6_rt_hdr *)(skb_network_header(pktopts) +
-                                                 rxopt->srcrt));
-                }
 
                 if (opt != NULL && opt->srcrt != NULL) {
                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
@@ -570,15 +559,6 @@ static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
         if (sk_acceptq_is_full(sk))
                 goto out_overflow;
 
-        if (np->rxopt.bits.osrcrt == 2 && opt == NULL && ireq6->pktopts) {
-                const struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
-
-                if (rxopt->srcrt)
-                        opt = ipv6_invert_rthdr(sk,
-                   (struct ipv6_rt_hdr *)(skb_network_header(ireq6->pktopts) +
-                                          rxopt->srcrt));
-        }
-
         if (dst == NULL) {
                 struct in6_addr *final_p = NULL, final;
                 struct flowi fl;
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index ba1386dd4168..fe0f49024a0a 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -657,11 +657,10 @@ int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
                         rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
 
                         switch (rthdr->type) {
-                        case IPV6_SRCRT_TYPE_0:
 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
                         case IPV6_SRCRT_TYPE_2:
-#endif
                                 break;
+#endif
                         default:
                                 err = -EINVAL;
                                 goto exit_f;
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index fc3a961fc5ba..c82d4d49f71f 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -427,18 +427,6 @@ looped_back:
         }
 
         switch (hdr->type) {
-        case IPV6_SRCRT_TYPE_0:
-                if (accept_source_route <= 0)
-                        goto unknown_rh;
-                if (hdr->hdrlen & 0x01) {
-                        IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
-                                         IPSTATS_MIB_INHDRERRORS);
-                        icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
-                                          ((&hdr->hdrlen) -
-                                           skb_network_header(skb)));
-                        return -1;
-                }
-                break;
 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
         case IPV6_SRCRT_TYPE_2:
                 if (accept_source_route < 0)
@@ -576,72 +564,6 @@ void __init ipv6_rthdr_init(void)
                 printk(KERN_ERR "ipv6_rthdr_init: Could not register protocol\n");
 };
 
-/*
-   This function inverts received rthdr.
-   NOTE: specs allow to make it automatically only if
-   packet authenticated.
-
-   I will not discuss it here (though, I am really pissed off at
-   this stupid requirement making rthdr idea useless)
-
-   Actually, it creates severe problems  for us.
-   Embryonic requests has no associated sockets,
-   so that user have no control over it and
-   cannot not only to set reply options, but
-   even to know, that someone wants to connect
-   without success. :-(
-
-   For now we need to test the engine, so that I created
-   temporary (or permanent) backdoor.
-   If listening socket set IPV6_RTHDR to 2, then we invert header.
-                                                   --ANK (980729)
- */
-
-struct ipv6_txoptions *
-ipv6_invert_rthdr(struct sock *sk, struct ipv6_rt_hdr *hdr)
-{
-        /* Received rthdr:
-
-           [ H1 -> H2 -> ... H_prev ]  daddr=ME
-
-           Inverted result:
-           [ H_prev -> ... -> H1 ] daddr =sender
-
-           Note, that IP output engine will rewrite this rthdr
-           by rotating it left by one addr.
-         */
-
-        int n, i;
-        struct rt0_hdr *rthdr = (struct rt0_hdr*)hdr;
-        struct rt0_hdr *irthdr;
-        struct ipv6_txoptions *opt;
-        int hdrlen = ipv6_optlen(hdr);
-
-        if (hdr->segments_left ||
-            hdr->type != IPV6_SRCRT_TYPE_0 ||
-            hdr->hdrlen & 0x01)
-                return NULL;
-
-        n = hdr->hdrlen >> 1;
-        opt = sock_kmalloc(sk, sizeof(*opt) + hdrlen, GFP_ATOMIC);
-        if (opt == NULL)
-                return NULL;
-        memset(opt, 0, sizeof(*opt));
-        opt->tot_len = sizeof(*opt) + hdrlen;
-        opt->srcrt = (void*)(opt+1);
-        opt->opt_nflen = hdrlen;
-
-        memcpy(opt->srcrt, hdr, sizeof(*hdr));
-        irthdr = (struct rt0_hdr*)opt->srcrt;
-        irthdr->reserved = 0;
-        opt->srcrt->segments_left = n;
-        for (i=0; i<n; i++)
-                memcpy(irthdr->addr+i, rthdr->addr+(n-1-i), 16);
-        return opt;
-}
-
-EXPORT_SYMBOL_GPL(ipv6_invert_rthdr);
-
 /**********************************
   Hop-by-hop options.
  **********************************/
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 1c3506696cb5..1841714ac419 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -416,11 +416,10 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
                         switch (rthdr->type) {
-                        case IPV6_SRCRT_TYPE_0:
 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
                         case IPV6_SRCRT_TYPE_2:
-#endif
                                 break;
+#endif
                         default:
                                 goto sticky_done;
                         }
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 193d9d60bb7a..d67fb1ef751e 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -484,17 +484,6 @@ 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.osrcrt == 2 &&
-                    treq->pktopts) {
-                        struct sk_buff *pktopts = treq->pktopts;
-                        struct inet6_skb_parm *rxopt = IP6CB(pktopts);
-                        if (rxopt->srcrt)
-                                opt = ipv6_invert_rthdr(sk,
-                          (struct ipv6_rt_hdr *)(skb_network_header(pktopts) +
-                                                 rxopt->srcrt));
-                }
-
                 if (opt && opt->srcrt) {
                         struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
                         ipv6_addr_copy(&final, &fl.fl6_dst);
@@ -1391,15 +1380,6 @@ 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.osrcrt == 2 &&
-            opt == NULL && treq->pktopts) {
-                struct inet6_skb_parm *rxopt = IP6CB(treq->pktopts);
-                if (rxopt->srcrt)
-                        opt = ipv6_invert_rthdr(sk,
-                   (struct ipv6_rt_hdr *)(skb_network_header(treq->pktopts) +
-                                          rxopt->srcrt));
-        }
-
         if (dst == NULL) {
                 struct in6_addr *final_p = NULL, final;
                 struct flowi fl;