On Mon, 6 Jun 2016 17:33:36 +0100
Stuart Henderson <s...@spacehopper.org> wrote:
> On 2016/06/06 16:15, Vincent Gross wrote:
> > When sending ARP requests, or when writing to a bpf handle (as when
> > sending DHCP Discover), we bypass pf(4) so we have no way to define
> > the priority (m->m_pkthdr.pf.prio) of the outgoing packets.
[...]
> >
> > This diff adds
> > 1) an if_llprio field to struct ifnet
>
> struct if_data.. this is used by enough ports that changing the abi
[...]
>
> > diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8
>
> BTW. patch warns about offsets if you apply this to -current.
>
[...]
>
> Other than these points, it seems a useful thing to do, pppoe could
> use it too.
>
> I wonder what these broken ISP devices are that require the
> priority field in the vlan frame header to be 0 (aka "prio 1")...
>
r2 below. I moved if_llprio from if_data to struct ifnet, and went from
u_char to u_int8_t. I also added a bound check in ifioctl().
Comments ? ok ?
Index: sbin/ifconfig/ifconfig.8
===================================================================
RCS file: /cvs/src/sbin/ifconfig/ifconfig.8,v
retrieving revision 1.267
diff -u -p -r1.267 ifconfig.8
--- sbin/ifconfig/ifconfig.8 6 Apr 2016 10:07:14 -0000 1.267
+++ sbin/ifconfig/ifconfig.8 6 Jun 2016 21:43:46 -0000
@@ -327,6 +327,10 @@ Disable special processing at the link l
Change the link layer address (MAC address) of the interface.
This should be specified as six colon-separated hex values, or can
be chosen randomly.
+.It Cm llprio Ar prio
+Set the priority for link layer communications
+.Pf ( Xr arp 4 ,
+.Xr bpf 4 ) .
.It Cm media Op Ar type
Set the media type of the interface to
.Ar type .
Index: sbin/ifconfig/ifconfig.c
===================================================================
RCS file: /cvs/src/sbin/ifconfig/ifconfig.c,v
retrieving revision 1.322
diff -u -p -r1.322 ifconfig.c
--- sbin/ifconfig/ifconfig.c 3 May 2016 17:52:33 -0000 1.322
+++ sbin/ifconfig/ifconfig.c 6 Jun 2016 21:43:46 -0000
@@ -135,6 +135,7 @@ char name[IFNAMSIZ];
int flags, xflags, setaddr, setipdst, doalias;
u_long metric, mtu;
int rdomainid;
+int llprio;
int clearaddr, s;
int newaddr = 0;
int af = AF_INET;
@@ -157,6 +158,7 @@ void addaf(const char *, int);
void removeaf(const char *, int);
void setifbroadaddr(const char *, int);
void setifmtu(const char *, int);
+void setifllprio(const char *, int);
void setifnwid(const char *, int);
void setifbssid(const char *, int);
void setifnwkey(const char *, int);
@@ -521,6 +523,7 @@ const struct cmd {
{ "instance", NEXTARG, A_MEDIAINST, setmediainst },
{ "inst", NEXTARG, A_MEDIAINST, setmediainst },
{ "lladdr", NEXTARG, 0, setiflladdr },
+ { "llprio", NEXTARG, 0, setifllprio },
{ NULL, /*src*/ 0, 0, setifaddr },
{ NULL, /*dst*/ 0, 0, setifdstaddr },
{ NULL, /*illegal*/0, 0, NULL },
@@ -854,6 +857,11 @@ getinfo(struct ifreq *ifr, int create)
else
rdomainid = ifr->ifr_rdomainid;
#endif
+ if (ioctl(s, SIOCGIFLLPRIO, (caddr_t)ifr) < 0)
+ llprio = 0;
+ else
+ llprio = ifr->ifr_llprio;
+
return (0);
}
@@ -1411,6 +1419,21 @@ setifmtu(const char *val, int d)
/* ARGSUSED */
void
+setifllprio(const char *val, int d)
+{
+ const char *errmsg = NULL;
+
+ (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+
+ ifr.ifr_mtu = strtonum(val, 0, UCHAR_MAX, &errmsg);
+ if (errmsg)
+ errx(1, "mtu %s: %s", val, errmsg);
+ if (ioctl(s, SIOCSIFLLPRIO, (caddr_t)&ifr) < 0)
+ warn("SIOCSIFLLPRIO");
+}
+
+/* ARGSUSED */
+void
setifgroup(const char *group_name, int dummy)
{
struct ifgroupreq ifgr;
@@ -2894,6 +2917,7 @@ status(int link, struct sockaddr_dl *sdl
printf(" metric %lu", metric);
if (mtu)
printf(" mtu %lu", mtu);
+ printf(" llprio %lu", llprio);
putchar('\n');
#ifndef SMALL
if (showcapsflag)
Index: sys/net/bpf.c
===================================================================
RCS file: /cvs/src/sys/net/bpf.c,v
retrieving revision 1.141
diff -u -p -r1.141 bpf.c
--- sys/net/bpf.c 18 May 2016 03:46:03 -0000 1.141
+++ sys/net/bpf.c 6 Jun 2016 21:43:48 -0000
@@ -561,6 +561,7 @@ bpfwrite(dev_t dev, struct uio *uio, int
}
m->m_pkthdr.ph_rtableid = ifp->if_rdomain;
+ m->m_pkthdr.pf.prio = ifp->if_llprio;
if (d->bd_hdrcmplt && dst.ss_family == AF_UNSPEC)
dst.ss_family = pseudo_AF_HDRCMPLT;
Index: sys/net/if.c
===================================================================
RCS file: /cvs/src/sys/net/if.c,v
retrieving revision 1.433
diff -u -p -r1.433 if.c
--- sys/net/if.c 18 May 2016 03:46:03 -0000 1.433
+++ sys/net/if.c 6 Jun 2016 21:43:48 -0000
@@ -536,6 +536,7 @@ if_attach_common(struct ifnet *ifp)
M_TEMP, M_WAITOK|M_ZERO);
ifp->if_linkstatetask = malloc(sizeof(*ifp->if_linkstatetask),
M_TEMP, M_WAITOK|M_ZERO);
+ ifp->if_llprio = IFQ_DEFPRIO;
SRPL_INIT(&ifp->if_inputs);
}
@@ -1986,6 +1987,18 @@ ifioctl(struct socket *so, u_long cmd, c
}
ifnewlladdr(ifp);
+ break;
+
+ case SIOCGIFLLPRIO:
+ ifr->ifr_llprio = ifp->if_llprio;
+ break;
+
+ case SIOCSIFLLPRIO:
+ if ((error = suser(p, 0)))
+ return (error);
+ if (ifr->ifr_llprio > UCHAR_MAX)
+ return (EINVAL);
+ ifp->if_llprio = ifr->ifr_llprio;
break;
default:
Index: sys/net/if.h
===================================================================
RCS file: /cvs/src/sys/net/if.h,v
retrieving revision 1.176
diff -u -p -r1.176 if.h
--- sys/net/if.h 2 Mar 2016 00:00:16 -0000 1.176
+++ sys/net/if.h 6 Jun 2016 21:43:48 -0000
@@ -378,6 +378,7 @@ struct ifreq {
#define ifr_ttl ifr_ifru.ifru_metric /* tunnel TTL
(overload) */
#define ifr_data ifr_ifru.ifru_data /* for use by interface
*/
#define ifr_index ifr_ifru.ifru_index /* interface index */
+#define ifr_llprio ifr_ifru.ifru_metric /* link layer priority */
};
struct ifaliasreq {
Index: sys/net/if_var.h
===================================================================
RCS file: /cvs/src/sys/net/if_var.h,v
retrieving revision 1.71
diff -u -p -r1.71 if_var.h
--- sys/net/if_var.h 15 Apr 2016 05:05:21 -0000 1.71
+++ sys/net/if_var.h 6 Jun 2016 21:43:48 -0000
@@ -131,6 +131,7 @@ struct ifnet { /* and the
entries */
char if_description[IFDESCRSIZE]; /* interface description */
u_short if_rtlabelid; /* next route label */
u_int8_t if_priority;
+ u_int8_t if_llprio; /* link layer priority */
struct timeout *if_slowtimo; /* watchdog timeout */
struct task *if_watchdogtask; /* watchdog task */
struct task *if_linkstatetask; /* task to do route updates */
Index: sys/netinet/if_ether.c
===================================================================
RCS file: /cvs/src/sys/netinet/if_ether.c,v
retrieving revision 1.213
diff -u -p -r1.213 if_ether.c
--- sys/netinet/if_ether.c 6 Jun 2016 07:07:11 -0000 1.213
+++ sys/netinet/if_ether.c 6 Jun 2016 21:43:48 -0000
@@ -235,6 +235,7 @@ arprequest(struct ifnet *ifp, u_int32_t
m->m_len = sizeof(*ea);
m->m_pkthdr.len = sizeof(*ea);
m->m_pkthdr.ph_rtableid = ifp->if_rdomain;
+ m->m_pkthdr.pf.prio = ifp->if_llprio;
MH_ALIGN(m, sizeof(*ea));
ea = mtod(m, struct ether_arp *);
eh = (struct ether_header *)sa.sa_data;
@@ -832,6 +833,7 @@ revarprequest(struct ifnet *ifp)
return;
m->m_len = sizeof(*ea);
m->m_pkthdr.len = sizeof(*ea);
+ m->m_pkthdr.pf.prio = ifp->if_llprio;
MH_ALIGN(m, sizeof(*ea));
ea = mtod(m, struct ether_arp *);
eh = (struct ether_header *)sa.sa_data;
Index: sys/sys/sockio.h
===================================================================
RCS file: /cvs/src/sys/sys/sockio.h,v
retrieving revision 1.64
diff -u -p -r1.64 sockio.h
--- sys/sys/sockio.h 31 May 2016 22:35:02 -0000 1.64
+++ sys/sys/sockio.h 6 Jun 2016 21:43:48 -0000
@@ -202,6 +202,9 @@
#define SIOCGIFPARENT _IOWR('i', 179, struct if_parent) /* get parent if */
#define SIOCDIFPARENT _IOW('i', 180, struct ifreq) /* del parent if */
+#define SIOCSIFLLPRIO _IOW('i', 181, struct ifreq) /* set ifnet
llprio */
+#define SIOCGIFLLPRIO _IOWR('i', 182, struct ifreq) /* get ifnet
llprio */
+
#define SIOCSVH _IOWR('i', 245, struct ifreq) /* set carp
param */
#define SIOCGVH _IOWR('i', 246, struct ifreq) /* get carp
param */
