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netinet: provide "at offset" variant of the in_delayed_cksum() API

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The need for such a variant comes from the fact that we need to
re-calculate checksum aftet ng_nat(4) transformations while getting
mbufs from the layer 2 (ethernet) directly.

Reviewed by:	markj, tuexen
Approved by:	tuexen
Sponsored by:	Sippy Software, Inc.
Differential Revision:	https://reviews.freebsd.org/D49677
MFC After:	2 weeks
This commit is contained in:
Maxim Sobolev 2025-08-25 15:12:56 -07:00
parent 7df90d9590
commit 5feb38e378
2 changed files with 11 additions and 3 deletions
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13
sys/netinet/ip_output.c
View file

@ -1044,14 +1044,14 @@ done:
}
void
in_delayed_cksum(struct mbuf *m)
in_delayed_cksum_o(struct mbuf *m, uint16_t iph_offset)
{
struct ip *ip;
struct udphdr *uh;
uint16_t cklen, csum, offset;
ip = mtod(m, struct ip *);
offset = ip->ip_hl << 2 ;
ip = (struct ip *)mtodo(m, iph_offset);
offset = iph_offset + (ip->ip_hl << 2);
if (m->m_pkthdr.csum_flags & CSUM_UDP) {
/* if udp header is not in the first mbuf copy udplen */
@ -1078,6 +1078,13 @@ in_delayed_cksum(struct mbuf *m)
*(u_short *)mtodo(m, offset) = csum;
}
void
in_delayed_cksum(struct mbuf *m)
{
in_delayed_cksum_o(m, 0);
}
/*
* IP socket option processing.
*/

1
sys/netinet/ip_var.h
View file

@ -271,6 +271,7 @@ VNET_DECLARE(struct pfil_head *, inet_local_pfil_head);
#define PFIL_INET_LOCAL_NAME "inet-local"
void in_delayed_cksum(struct mbuf *m);
void in_delayed_cksum_o(struct mbuf *m, uint16_t o);
/* Hooks for ipfw, dummynet, divert etc. Most are declared in raw_ip.c */
/*