Date: Tue, 12 Jun 2012 14:02:38 +0000 (UTC) From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r236959 - in head: share/man/man4 sys/netinet Message-ID: <201206121402.q5CE2cs1057392@svn.freebsd.org>
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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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