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examples/ipsec-secgw: update incremental checksum

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When TTL is decremented or ecn is updated in IP header
before forwarding the packet, checksum needs to be updated.

In this patch an incremental checksum is added for ipv4 case.

Signed-off-by: Akhil Goyal <akhil.goyal@nxp.com>
Acked-by: Radu Nicolau <radu.nicolau@intel.com>
This commit is contained in:
Akhil Goyal 2018-01-15 18:12:12 +05:30 committed by Pablo de Lara
parent 9ebafd1e3c
commit 27d822e88e
1 changed files with 18 additions and 1 deletions
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19
examples/ipsec-secgw/ipip.h
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@ -27,6 +27,10 @@ ipip_outbound(struct rte_mbuf *m, uint32_t offset, uint32_t is_ipv6,
if (inip4->ip_v == IPVERSION) {
/* XXX This should be done by the forwarding engine instead */
inip4->ip_ttl -= 1;
if (inip4->ip_sum >= rte_cpu_to_be_16(0xffff - 0x100))
inip4->ip_sum += rte_cpu_to_be_16(0x100) + 1;
else
inip4->ip_sum += rte_cpu_to_be_16(0x100);
ds_ecn = inip4->ip_tos;
} else {
inip6 = (struct ip6_hdr *)inip4;
@ -95,8 +99,17 @@ ip6ip_outbound(struct rte_mbuf *m, uint32_t offset,
static inline void
ip4_ecn_setup(struct ip *ip4)
{
if (ip4->ip_tos & IPTOS_ECN_MASK)
if (ip4->ip_tos & IPTOS_ECN_MASK) {
unsigned long sum;
uint8_t old;
old = ip4->ip_tos;
ip4->ip_tos |= IPTOS_ECN_CE;
sum = old + (~(*(uint8_t *)&ip4->ip_tos) & 0xff);
sum += rte_be_to_cpu_16(ip4->ip_sum);
sum = (sum & 0xffff) + (sum >> 16);
ip4->ip_sum = rte_cpu_to_be_16(sum + (sum >> 16));
}
}
static inline void
@ -140,6 +153,10 @@ ipip_inbound(struct rte_mbuf *m, uint32_t offset)
ip4_ecn_setup(inip4);
/* XXX This should be done by the forwarding engine instead */
inip4->ip_ttl -= 1;
if (inip4->ip_sum >= rte_cpu_to_be_16(0xffff - 0x100))
inip4->ip_sum += rte_cpu_to_be_16(0x100) + 1;
else
inip4->ip_sum += rte_cpu_to_be_16(0x100);
m->packet_type &= ~RTE_PTYPE_L4_MASK;
if (inip4->ip_p == IPPROTO_UDP)
m->packet_type |= RTE_PTYPE_L4_UDP;