d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

MFp4 bz_ipv6_fast:

Browse Source 
Introduce a (for now copied stripped down) in6_cksum_pseudo()
  function.  We should be able to use this from in6_cksum() but
  we should also ponder possible MD specific improvements.
  It takes an extra csum argument to allow for easy checks as
  will be done by the upper layer protocol input paths.

  Sponsored by:	The FreeBSD Foundation
  Sponsored by:	iXsystems

Reviewed by:	gnn (as part of the whole)
MFC After:	3 days
This commit is contained in:
Bjoern A. Zeeb 2012-05-24 18:25:09 +00:00
parent 38f1b2d1bc
commit ecade87edf
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=235924
2 changed files with 62 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/netinet6/in6.h
View File

@ -632,7 +632,9 @@ struct ip6_mtuinfo {
#ifdef _KERNEL
struct cmsghdr;
struct ip6_hdr;
int in6_cksum_pseudo(struct ip6_hdr *, uint32_t, uint8_t, uint16_t);
int in6_cksum __P((struct mbuf *, u_int8_t, u_int32_t, u_int32_t));
int in6_localaddr __P((struct in6_addr *));
int in6_localip(struct in6_addr *);

60
sys/netinet6/in6_cksum.c
View File

@ -80,6 +80,66 @@ __FBSDID("$FreeBSD$");
#define ADDCARRY(x) (x > 65535 ? x -= 65535 : x)
#define REDUCE {l_util.l = sum; sum = l_util.s[0] + l_util.s[1]; (void)ADDCARRY(sum);}
static int
_in6_cksum_pseudo(struct ip6_hdr *ip6, uint32_t len, uint8_t nxt, uint16_t csum)
{
int sum;
uint16_t scope, *w;
union {
u_int16_t phs[4];
struct {
u_int32_t ph_len;
u_int8_t ph_zero[3];
u_int8_t ph_nxt;
} __packed ph;
} uph;
sum = csum;
/*
* First create IP6 pseudo header and calculate a summary.
*/
uph.ph.ph_len = htonl(len);
uph.ph.ph_zero[0] = uph.ph.ph_zero[1] = uph.ph.ph_zero[2] = 0;
uph.ph.ph_nxt = nxt;
/* Payload length and upper layer identifier. */
sum += uph.phs[0]; sum += uph.phs[1];
sum += uph.phs[2]; sum += uph.phs[3];
/* IPv6 source address. */
scope = in6_getscope(&ip6->ip6_src);
w = (u_int16_t *)&ip6->ip6_src;
sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3];
sum += w[4]; sum += w[5]; sum += w[6]; sum += w[7];
if (scope != 0)
sum -= scope;
/* IPv6 destination address. */
scope = in6_getscope(&ip6->ip6_dst);
w = (u_int16_t *)&ip6->ip6_dst;
sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3];
sum += w[4]; sum += w[5]; sum += w[6]; sum += w[7];
if (scope != 0)
sum -= scope;
return (sum);
}
int
in6_cksum_pseudo(struct ip6_hdr *ip6, uint32_t len, uint8_t nxt, uint16_t csum)
{
int sum;
union {
u_int16_t s[2];
u_int32_t l;
} l_util;
sum = _in6_cksum_pseudo(ip6, len, nxt, csum);
REDUCE;
return (sum);
}
/*
* m MUST contain a contiguous IP6 header.
* off is an offset where TCP/UDP/ICMP6 header starts.