On Sun, Aug 19, 2018 at 7:56 AM, Michael Tuexen <tue...@freebsd.org> wrote: > Author: tuexen > Date: Sun Aug 19 14:56:10 2018 > New Revision: 338053 > URL: https://svnweb.freebsd.org/changeset/base/338053 > > Log: > … a keyed hash function taking > the source and destination addresses and port numbers into account. > The keyed hash function is the same a used for the initial TSN. > ... > Modified: head/sys/netinet/tcp_subr.c > ============================================================================== > --- head/sys/netinet/tcp_subr.c Sun Aug 19 14:48:32 2018 (r338052) > +++ head/sys/netinet/tcp_subr.c Sun Aug 19 14:56:10 2018 (r338053) > @@ -233,6 +233,9 @@ VNET_DEFINE(uma_zone_t, sack_hole_zone); > ... > > +static uint32_t > +tcp_keyed_hash(struct in_conninfo *inc, u_char *key) > +{ > + MD5_CTX ctx; > + uint32_t hash[4]; > > + MD5Init(&ctx); > + MD5Update(&ctx, &inc->inc_fport, sizeof(uint16_t)); > + MD5Update(&ctx, &inc->inc_lport, sizeof(uint16_t)); > + switch (inc->inc_flags & INC_ISIPV6) { > +#ifdef INET > + case 0: > + MD5Update(&ctx, &inc->inc_faddr, sizeof(struct in_addr)); > + MD5Update(&ctx, &inc->inc_laddr, sizeof(struct in_addr)); > + break; > +#endif > +#ifdef INET6 > + case INC_ISIPV6: > + MD5Update(&ctx, &inc->inc6_faddr, sizeof(struct in6_addr)); > + MD5Update(&ctx, &inc->inc6_laddr, sizeof(struct in6_addr)); > + break; > +#endif > + } > + MD5Update(&ctx, key, 32); > + MD5Final((unsigned char *)hash, &ctx); > + > + return (hash[0]);
Hi Michael, How was this particular keyed hash function construction chosen? (Yes, I see it is the same initial TSN, but how was that selected?) Thanks, Conrad _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
