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Renumber IPPROTO_DIVERT out of the range of valid IP protocol numbers.

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This allows socket() to return an error when the kernel is not built
with IPDIVERT, and doesn't prevent future applications from using the
"borrowed" IP protocol number.  The sysctl net.inet.raw.olddiverterror
controls whether opening a socket with the "borrowed" IP protocol
fails with an accompanying kernel printf; this code should last only a
couple of releases.

Approved by:	re
This commit is contained in:
Bill Fenner 2002-10-29 16:46:13 +00:00
parent e5f3fe8c97
commit 4d3ffc9841
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=106152
3 changed files with 19 additions and 4 deletions
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7
sys/netinet/in.h
View File

@ -236,13 +236,16 @@ __END_DECLS
#define IPPROTO_PIM 103 /* Protocol Independent Mcast */
#define IPPROTO_PGM 113 /* PGM */
/* 255: Reserved */
/* BSD Private, local use, namespace incursion */
#define IPPROTO_DIVERT 254 /* divert pseudo-protocol */
/* BSD Private, local use, namespace incursion, no longer used */
#define IPPROTO_OLD_DIVERT 254 /* OLD divert pseudo-proto */
#define IPPROTO_MAX 256
/* last return value of *_input(), meaning "all job for this pkt is done". */
#define IPPROTO_DONE 257
/* Only used internally, so can be outside the range of valid IP protocols. */
#define IPPROTO_DIVERT 258 /* divert pseudo-protocol */
/*
* Local port number conventions:
*

4
sys/netinet/ip_divert.c
View File

@ -136,8 +136,8 @@ div_init(void)
}
/*
* IPPROTO_DIVERT is not a real IP protocol; don't allow any packets
* with that protocol number to enter the system from the outside.
* IPPROTO_DIVERT is not in the real IP protocol number space; this
* function should never be called. Just in case, drop any packets.
*/
void
div_input(struct mbuf *m, int off)

12
sys/netinet/raw_ip.c
View File

@ -493,11 +493,14 @@ rip_ctlinput(cmd, sa, vip)
u_long rip_sendspace = RIPSNDQ;
u_long rip_recvspace = RIPRCVQ;
int rip_olddiverterror = 1;
SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
&rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
&rip_recvspace, 0, "Maximum incoming raw IP datagram size");
SYSCTL_INT(_net_inet_raw, OID_AUTO, olddiverterror, CTLFLAG_RW,
&rip_olddiverterror, 0, "Return an error when creating an 'old' DIVERT socket");
static int
rip_attach(struct socket *so, int proto, struct thread *td)
@ -511,6 +514,15 @@ rip_attach(struct socket *so, int proto, struct thread *td)
if (td && (error = suser(td)) != 0)
return error;
if (proto >= IPPROTO_MAX || proto < 0)
return EPROTONOSUPPORT;
/* To be removed before 5.2 */
if (rip_olddiverterror && proto == IPPROTO_OLD_DIVERT) {
printf("Old IPDIVERT program needs to be recompiled, or new IP proto 254 user needs sysctl net.inet.raw.olddiverterror=0\n");
return EPROTONOSUPPORT;
}
error = soreserve(so, rip_sendspace, rip_recvspace);
if (error)
return error;