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net: add IPv6 header extension parsing function

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Introduce new function for IPv6 header extension parsing able to
determine extension length and next protocol number.

This function is helpful when implementing IPv6 header traversing.

Signed-off-by: Marcin Smoczynski <marcinx.smoczynski@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Akhil Goyal <akhil.goyal@nxp.com>
Tested-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
This commit is contained in:
Marcin Smoczynski 2019-06-24 15:39:57 +02:00 committed by Akhil Goyal
parent 11678a1471
commit 1f79768ca6
1 changed files with 50 additions and 0 deletions
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50
lib/librte_net/rte_ip.h
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@ -440,6 +440,56 @@ rte_ipv6_udptcp_cksum(const struct rte_ipv6_hdr *ipv6_hdr, const void *l4_hdr)
return (uint16_t)cksum;
}
/* IPv6 fragmentation header size */
#define RTE_IPV6_FRAG_HDR_SIZE 8
/**
* Parse next IPv6 header extension
*
* This function checks if proto number is an IPv6 extensions and parses its
* data if so, providing information on next header and extension length.
*
* @param p
* Pointer to an extension raw data.
* @param proto
* Protocol number extracted from the "next header" field from
* the IPv6 header or the previous extension.
* @param ext_len
* Extension data length.
* @return
* next protocol number if proto is an IPv6 extension, -EINVAL otherwise
*/
__rte_experimental
static inline int
rte_ipv6_get_next_ext(uint8_t *p, int proto, size_t *ext_len)
{
int next_proto;
switch (proto) {
case IPPROTO_AH:
next_proto = *p++;
*ext_len = (*p + 2) * sizeof(uint32_t);
break;
case IPPROTO_HOPOPTS:
case IPPROTO_ROUTING:
case IPPROTO_DSTOPTS:
next_proto = *p++;
*ext_len = (*p + 1) * sizeof(uint64_t);
break;
case IPPROTO_FRAGMENT:
next_proto = *p;
*ext_len = RTE_IPV6_FRAG_HDR_SIZE;
break;
default:
return -EINVAL;
}
return next_proto;
}
#ifdef __cplusplus
}
#endif