Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 109 insertions, 0 deletions

diff --git a/net/ipv6/exthdrs_core.c b/net/ipv6/exthdrs_core.c
new file mode 100644
index 00000000000..6dda815c013
--- /dev/null
+++ b/net/ipv6/exthdrs_core.c
@@ -0,0 +1,109 @@
+/*
+ * IPv6 library code, needed by static components when full IPv6 support is
+ * not configured or static.
+ */
+#include <net/ipv6.h>
+
+/* 
+ * find out if nexthdr is a well-known extension header or a protocol
+ */
+
+int ipv6_ext_hdr(u8 nexthdr)
+{
+        /* 
+         * find out if nexthdr is an extension header or a protocol
+         */
+        return ( (nexthdr == NEXTHDR_HOP)       ||
+                 (nexthdr == NEXTHDR_ROUTING)   ||
+                 (nexthdr == NEXTHDR_FRAGMENT)  ||
+                 (nexthdr == NEXTHDR_AUTH)      ||
+                 (nexthdr == NEXTHDR_NONE)      ||
+                 (nexthdr == NEXTHDR_DEST) );
+}
+
+/*
+ * Skip any extension headers. This is used by the ICMP module.
+ *
+ * Note that strictly speaking this conflicts with RFC 2460 4.0:
+ * ...The contents and semantics of each extension header determine whether 
+ * or not to proceed to the next header.  Therefore, extension headers must
+ * be processed strictly in the order they appear in the packet; a
+ * receiver must not, for example, scan through a packet looking for a
+ * particular kind of extension header and process that header prior to
+ * processing all preceding ones.
+ * 
+ * We do exactly this. This is a protocol bug. We can't decide after a
+ * seeing an unknown discard-with-error flavour TLV option if it's a 
+ * ICMP error message or not (errors should never be send in reply to
+ * ICMP error messages).
+ * 
+ * But I see no other way to do this. This might need to be reexamined
+ * when Linux implements ESP (and maybe AUTH) headers.
+ * --AK
+ *
+ * This function parses (probably truncated) exthdr set "hdr"
+ * of length "len". "nexthdrp" initially points to some place,
+ * where type of the first header can be found.
+ *
+ * It skips all well-known exthdrs, and returns pointer to the start
+ * of unparsable area i.e. the first header with unknown type.
+ * If it is not NULL *nexthdr is updated by type/protocol of this header.
+ *
+ * NOTES: - if packet terminated with NEXTHDR_NONE it returns NULL.
+ *        - it may return pointer pointing beyond end of packet,
+ *          if the last recognized header is truncated in the middle.
+ *        - if packet is truncated, so that all parsed headers are skipped,
+ *          it returns NULL.
+ *        - First fragment header is skipped, not-first ones
+ *          are considered as unparsable.
+ *        - ESP is unparsable for now and considered like
+ *          normal payload protocol.
+ *        - Note also special handling of AUTH header. Thanks to IPsec wizards.
+ *
+ * --ANK (980726)
+ */
+
+int ipv6_skip_exthdr(const struct sk_buff *skb, int start, u8 *nexthdrp, int len)
+{
+        u8 nexthdr = *nexthdrp;
+
+        while (ipv6_ext_hdr(nexthdr)) {
+                struct ipv6_opt_hdr _hdr, *hp;
+                int hdrlen;
+
+                if (len < (int)sizeof(struct ipv6_opt_hdr))
+                        return -1;
+                if (nexthdr == NEXTHDR_NONE)
+                        return -1;
+                hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
+                if (hp == NULL)
+                        BUG();
+                if (nexthdr == NEXTHDR_FRAGMENT) {
+                        unsigned short _frag_off, *fp;
+                        fp = skb_header_pointer(skb,
+                                                start+offsetof(struct frag_hdr,
+                                                               frag_off),
+                                                sizeof(_frag_off),
+                                                &_frag_off);
+                        if (fp == NULL)
+                                return -1;
+
+                        if (ntohs(*fp) & ~0x7)
+                                break;
+                        hdrlen = 8;
+                } else if (nexthdr == NEXTHDR_AUTH)
+                        hdrlen = (hp->hdrlen+2)<<2; 
+                else
+                        hdrlen = ipv6_optlen(hp); 
+
+                nexthdr = hp->nexthdr;
+                len -= hdrlen;
+                start += hdrlen;
+        }
+
+        *nexthdrp = nexthdr;
+        return start;
+}
+
+EXPORT_SYMBOL(ipv6_ext_hdr);
+EXPORT_SYMBOL(ipv6_skip_exthdr);