diff options
Diffstat (limited to 'net/ipv6/exthdrs_core.c')
| -rw-r--r-- | net/ipv6/exthdrs_core.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/net/ipv6/exthdrs_core.c b/net/ipv6/exthdrs_core.c index 11b4e29c8452..c5e83fae4df4 100644 --- a/net/ipv6/exthdrs_core.c +++ b/net/ipv6/exthdrs_core.c @@ -112,6 +112,50 @@ int ipv6_skip_exthdr(const struct sk_buff *skb, int start, u8 *nexthdrp, } 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); + /* * find the offset to specified header or the protocol number of last header * if target < 0. "last header" is transport protocol header, ESP, or @@ -234,3 +278,4 @@ int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, return nexthdr; } EXPORT_SYMBOL(ipv6_find_hdr); + |