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Add ipv6_get_data_any and ip_get_data_any.

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These version allow returning an extension header or other
non–upper-layer protocol if it is the final header before the end of the
packet. This is used to parse the broken packets sent as part of
protocol scan.
This commit is contained in:
david
2011-06-17 05:47:33 +00:00
parent 332c93ea07
commit e748e46d9e
2 changed files with 92 additions and 64 deletions
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3
libnetutil/netutil.h
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@@ -194,12 +194,15 @@ int mac_cache_set(struct sockaddr_storage *ss, u8 *mac);
const void *ip_get_data(const void *packet, unsigned int *len,
struct abstract_ip_hdr *hdr);
const void *ip_get_data_any(const void *packet, unsigned int *len,
struct abstract_ip_hdr *hdr);
/* Get the upper-layer protocol from an IPv4 packet. */
const void *ipv4_get_data(const struct ip *ip, unsigned int *len);
/* Get the upper-layer protocol from an IPv6 packet. This skips over known
extension headers. The length of the upper-layer payload is stored in *len.
The protocol is stored in *nxt. Returns NULL in case of error. */
const void *ipv6_get_data(const struct ip6_hdr *ip6, unsigned int *len, u8 *nxt);
const void *ipv6_get_data_any(const struct ip6_hdr *ip6, unsigned int *len, u8 *nxt);
const void *icmp_get_data(const struct icmp_hdr *icmp, unsigned int *len);
const void *icmpv6_get_data(const struct icmpv6_hdr *icmpv6, unsigned int *len);