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authorVlad Yasevich <vyasevic@redhat.com>2012-11-15 08:49:20 +0000
committerDavid S. Miller <davem@davemloft.net>2012-11-15 17:39:23 -0500
commit3c73a0368e995f047c14388a05dcfba599053bef (patch)
tree1c5d8d505ec43c325ebc200ddd124f9c131e6558 /net/ipv6/exthdrs_core.c
parentipv6: Move exthdr offload support into separate file (diff)
downloadlinux-dev-3c73a0368e995f047c14388a05dcfba599053bef.tar.xz
linux-dev-3c73a0368e995f047c14388a05dcfba599053bef.zip
ipv6: Update ipv6 static library with newly needed functions
UDP offload needs some additional functions to be in the static kernel for it work correclty. Move those functions into the core. Signed-off-by: Vlad Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--net/ipv6/exthdrs_core.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/net/ipv6/exthdrs_core.c b/net/ipv6/exthdrs_core.c
index f73d59a14131..e7d756e19d1d 100644
--- a/net/ipv6/exthdrs_core.c
+++ b/net/ipv6/exthdrs_core.c
@@ -111,3 +111,47 @@ int ipv6_skip_exthdr(const struct sk_buff *skb, int start, u8 *nexthdrp,
return start;
}
EXPORT_SYMBOL(ipv6_skip_exthdr);
+
+int ipv6_find_tlv(struct sk_buff *skb, int offset, int type)
+{
+ const unsigned char *nh = skb_network_header(skb);
+ int packet_len = skb->tail - skb->network_header;
+ struct ipv6_opt_hdr *hdr;
+ int len;
+
+ if (offset + 2 > packet_len)
+ goto bad;
+ hdr = (struct ipv6_opt_hdr *)(nh + offset);
+ len = ((hdr->hdrlen + 1) << 3);
+
+ if (offset + len > packet_len)
+ goto bad;
+
+ offset += 2;
+ len -= 2;
+
+ while (len > 0) {
+ int opttype = nh[offset];
+ int optlen;
+
+ if (opttype == type)
+ return offset;
+
+ switch (opttype) {
+ case IPV6_TLV_PAD1:
+ optlen = 1;
+ break;
+ default:
+ optlen = nh[offset + 1] + 2;
+ if (optlen > len)
+ goto bad;
+ break;
+ }
+ offset += optlen;
+ len -= optlen;
+ }
+ /* not_found */
+ bad:
+ return -1;
+}
+EXPORT_SYMBOL_GPL(ipv6_find_tlv);