Author: tuexen
Date: Tue Jun 12 14:02:38 2012
New Revision: 236959
URL: http://svn.freebsd.org/changeset/base/236959
Log:
Add a IP_RECVTOS socket option to receive for received UDP/IPv4
packets a cmsg of type IP_RECVTOS which contains the TOS byte.
Much like IP_RECVTTL does for TTL. This allows to implement a
protocol on top of UDP and implementing ECN.
MFC after: 3 days
Modified:
head/share/man/man4/ip.4
head/sys/netinet/in.h
head/sys/netinet/in_pcb.c
head/sys/netinet/in_pcb.h
head/sys/netinet/ip_input.c
head/sys/netinet/ip_output.c
Modified: head/share/man/man4/ip.4
==============================================================================
--- head/share/man/man4/ip.4 Tue Jun 12 13:57:56 2012 (r236958)
+++ head/share/man/man4/ip.4 Tue Jun 12 14:02:38 2012 (r236959)
@@ -32,7 +32,7 @@
.\" @(#)ip.4 8.2 (Berkeley) 11/30/93
.\" $FreeBSD$
.\"
-.Dd November 14, 2011
+.Dd June 12, 2012
.Dt IP 4
.Os
.Sh NAME
@@ -286,6 +286,29 @@ cmsg_type = IP_RECVTTL
.\"
.Pp
If the
+.Dv IP_RECVTOS
+option is enabled on a
+.Dv SOCK_DGRAM
+socket, the
+.Xr recvmsg 2
+call will return the
+.Tn IP
+.Tn TOS
+(type of service) field for a
+.Tn UDP
+datagram.
+The msg_control field in the msghdr structure points to a buffer
+that contains a cmsghdr structure followed by the
+.Tn TOS .
+The cmsghdr fields have the following values:
+.Bd -literal
+cmsg_len = CMSG_LEN(sizeof(u_char))
+cmsg_level = IPPROTO_IP
+cmsg_type = IP_RECVTOS
+.Ed
+.\"
+.Pp
+If the
.Dv IP_RECVIF
option is enabled on a
.Dv SOCK_DGRAM
Modified: head/sys/netinet/in.h
==============================================================================
--- head/sys/netinet/in.h Tue Jun 12 13:57:56 2012 (r236958)
+++ head/sys/netinet/in.h Tue Jun 12 14:02:38 2012 (r236959)
@@ -462,6 +462,7 @@ __END_DECLS
#define IP_RECVTTL 65 /* bool; receive IP TTL w/dgram */
#define IP_MINTTL 66 /* minimum TTL for packet or drop
*/
#define IP_DONTFRAG 67 /* don't fragment packet */
+#define IP_RECVTOS 68 /* bool; receive IP TOS w/dgram */
/* IPv4 Source Filter Multicast API [RFC3678] */
#define IP_ADD_SOURCE_MEMBERSHIP 70 /* join a source-specific
group */
Modified: head/sys/netinet/in_pcb.c
==============================================================================
--- head/sys/netinet/in_pcb.c Tue Jun 12 13:57:56 2012 (r236958)
+++ head/sys/netinet/in_pcb.c Tue Jun 12 14:02:38 2012 (r236959)
@@ -2295,6 +2295,10 @@ db_print_inpflags(int inp_flags)
db_printf("%sINP_DONTFRAG", comma ? ", " : "");
comma = 1;
}
+ if (inp_flags & INP_RECVTOS) {
+ db_printf("%sINP_RECVTOS", comma ? ", " : "");
+ comma = 1;
+ }
if (inp_flags & IN6P_IPV6_V6ONLY) {
db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
comma = 1;
Modified: head/sys/netinet/in_pcb.h
==============================================================================
--- head/sys/netinet/in_pcb.h Tue Jun 12 13:57:56 2012 (r236958)
+++ head/sys/netinet/in_pcb.h Tue Jun 12 14:02:38 2012 (r236959)
@@ -509,6 +509,7 @@ void inp_4tuple_get(struct inpcb *inp,
#define INP_DONTFRAG 0x00000800 /* don't fragment packet */
#define INP_BINDANY 0x00001000 /* allow bind to any address
*/
#define INP_INHASHLIST 0x00002000 /* in_pcbinshash() has been
called */
+#define INP_RECVTOS 0x00004000 /* receive incoming IP TOS */
#define IN6P_IPV6_V6ONLY 0x00008000 /* restrict AF_INET6 socket
for v6 */
#define IN6P_PKTINFO 0x00010000 /* receive IP6 dst and I/F */
#define IN6P_HOPLIMIT 0x00020000 /* receive hoplimit */
@@ -528,7 +529,7 @@ void inp_4tuple_get(struct inpcb *inp,
#define IN6P_MTU 0x80000000 /* receive path MTU */
#define INP_CONTROLOPTS
(INP_RECVOPTS|INP_RECVRETOPTS|INP_RECVDSTADDR|\
- INP_RECVIF|INP_RECVTTL|\
+ INP_RECVIF|INP_RECVTTL|INP_RECVTOS|\
IN6P_PKTINFO|IN6P_HOPLIMIT|IN6P_HOPOPTS|\
IN6P_DSTOPTS|IN6P_RTHDR|IN6P_RTHDRDSTOPTS|\
IN6P_TCLASS|IN6P_AUTOFLOWLABEL|IN6P_RFC2292|\
Modified: head/sys/netinet/ip_input.c
==============================================================================
--- head/sys/netinet/ip_input.c Tue Jun 12 13:57:56 2012 (r236958)
+++ head/sys/netinet/ip_input.c Tue Jun 12 14:02:38 2012 (r236959)
@@ -1684,6 +1684,12 @@ makedummy:
if (*mp)
mp = &(*mp)->m_next;
}
+ if (inp->inp_flags & INP_RECVTOS) {
+ *mp = sbcreatecontrol((caddr_t) &ip->ip_tos,
+ sizeof(u_char), IP_RECVTOS, IPPROTO_IP);
+ if (*mp)
+ mp = &(*mp)->m_next;
+ }
}
/*
Modified: head/sys/netinet/ip_output.c
==============================================================================
--- head/sys/netinet/ip_output.c Tue Jun 12 13:57:56 2012
(r236958)
+++ head/sys/netinet/ip_output.c Tue Jun 12 14:02:38 2012
(r236959)
@@ -984,6 +984,7 @@ ip_ctloutput(struct socket *so, struct s
case IP_FAITH:
case IP_ONESBCAST:
case IP_DONTFRAG:
+ case IP_RECVTOS:
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
@@ -1047,6 +1048,9 @@ ip_ctloutput(struct socket *so, struct s
case IP_BINDANY:
OPTSET(INP_BINDANY);
break;
+ case IP_RECVTOS:
+ OPTSET(INP_RECVTOS);
+ break;
}
break;
#undef OPTSET
@@ -1156,6 +1160,7 @@ ip_ctloutput(struct socket *so, struct s
case IP_ONESBCAST:
case IP_DONTFRAG:
case IP_BINDANY:
+ case IP_RECVTOS:
switch (sopt->sopt_name) {
case IP_TOS:
@@ -1214,6 +1219,9 @@ ip_ctloutput(struct socket *so, struct s
case IP_BINDANY:
optval = OPTBIT(INP_BINDANY);
break;
+ case IP_RECVTOS:
+ optval = OPTBIT(INP_RECVTOS);
+ break;
}
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
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