diff options
| author | Maxim Sobolev <sobomax@FreeBSD.org> | 2025-08-25 22:12:56 +0000 |
|---|---|---|
| committer | Maxim Sobolev <sobomax@FreeBSD.org> | 2025-08-26 04:34:45 +0000 |
| commit | 5feb38e37847c10af86f5c75dc768518973c6aaa (patch) | |
| tree | 26196efd0b5836ca776a67faf276d3ab9a00ca22 | |
| parent | 7df90d9590abffe571a78f87b8272544ff11d61d (diff) | |
netinet: provide "at offset" variant of the in_delayed_cksum() API
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
| -rw-r--r-- | sys/netinet/ip_output.c | 13 | ||||
| -rw-r--r-- | sys/netinet/ip_var.h | 1 |
2 files changed, 11 insertions, 3 deletions
diff --git a/sys/netinet/ip_output.c b/sys/netinet/ip_output.c index ec6ba8d92015..ef08b9cfd3d6 100644 --- a/sys/netinet/ip_output.c +++ b/sys/netinet/ip_output.c @@ -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. */ diff --git a/sys/netinet/ip_var.h b/sys/netinet/ip_var.h index f782ebc53eb0..c113484079a3 100644 --- a/sys/netinet/ip_var.h +++ b/sys/netinet/ip_var.h @@ -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 */ /* |