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
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parent
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commit
3cca425b29
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=236959
@ -32,7 +32,7 @@
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.\" @(#)ip.4 8.2 (Berkeley) 11/30/93
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.\" $FreeBSD$
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.\"
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.Dd November 14, 2011
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.Dd June 12, 2012
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.Dt IP 4
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.Os
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.Sh NAME
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@ -286,6 +286,29 @@ cmsg_type = IP_RECVTTL
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.\"
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.Pp
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If the
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.Dv IP_RECVTOS
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option is enabled on a
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.Dv SOCK_DGRAM
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socket, the
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.Xr recvmsg 2
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call will return the
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.Tn IP
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.Tn TOS
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(type of service) field for a
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.Tn UDP
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datagram.
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The msg_control field in the msghdr structure points to a buffer
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that contains a cmsghdr structure followed by the
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.Tn TOS .
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The cmsghdr fields have the following values:
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.Bd -literal
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cmsg_len = CMSG_LEN(sizeof(u_char))
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cmsg_level = IPPROTO_IP
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cmsg_type = IP_RECVTOS
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.Ed
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.\"
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.Pp
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If the
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.Dv IP_RECVIF
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option is enabled on a
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.Dv SOCK_DGRAM
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@ -462,6 +462,7 @@ __END_DECLS
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#define IP_RECVTTL 65 /* bool; receive IP TTL w/dgram */
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#define IP_MINTTL 66 /* minimum TTL for packet or drop */
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#define IP_DONTFRAG 67 /* don't fragment packet */
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#define IP_RECVTOS 68 /* bool; receive IP TOS w/dgram */
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/* IPv4 Source Filter Multicast API [RFC3678] */
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#define IP_ADD_SOURCE_MEMBERSHIP 70 /* join a source-specific group */
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@ -2295,6 +2295,10 @@ db_print_inpflags(int inp_flags)
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db_printf("%sINP_DONTFRAG", comma ? ", " : "");
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comma = 1;
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}
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if (inp_flags & INP_RECVTOS) {
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db_printf("%sINP_RECVTOS", comma ? ", " : "");
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comma = 1;
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}
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if (inp_flags & IN6P_IPV6_V6ONLY) {
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db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
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comma = 1;
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@ -509,6 +509,7 @@ void inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
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#define INP_DONTFRAG 0x00000800 /* don't fragment packet */
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#define INP_BINDANY 0x00001000 /* allow bind to any address */
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#define INP_INHASHLIST 0x00002000 /* in_pcbinshash() has been called */
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#define INP_RECVTOS 0x00004000 /* receive incoming IP TOS */
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#define IN6P_IPV6_V6ONLY 0x00008000 /* restrict AF_INET6 socket for v6 */
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#define IN6P_PKTINFO 0x00010000 /* receive IP6 dst and I/F */
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#define IN6P_HOPLIMIT 0x00020000 /* receive hoplimit */
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@ -528,7 +529,7 @@ void inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
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#define IN6P_MTU 0x80000000 /* receive path MTU */
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#define INP_CONTROLOPTS (INP_RECVOPTS|INP_RECVRETOPTS|INP_RECVDSTADDR|\
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INP_RECVIF|INP_RECVTTL|\
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INP_RECVIF|INP_RECVTTL|INP_RECVTOS|\
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IN6P_PKTINFO|IN6P_HOPLIMIT|IN6P_HOPOPTS|\
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IN6P_DSTOPTS|IN6P_RTHDR|IN6P_RTHDRDSTOPTS|\
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IN6P_TCLASS|IN6P_AUTOFLOWLABEL|IN6P_RFC2292|\
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@ -1684,6 +1684,12 @@ ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
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if (*mp)
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mp = &(*mp)->m_next;
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}
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if (inp->inp_flags & INP_RECVTOS) {
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*mp = sbcreatecontrol((caddr_t) &ip->ip_tos,
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sizeof(u_char), IP_RECVTOS, IPPROTO_IP);
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if (*mp)
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mp = &(*mp)->m_next;
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}
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}
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/*
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@ -984,6 +984,7 @@ ip_ctloutput(struct socket *so, struct sockopt *sopt)
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case IP_FAITH:
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case IP_ONESBCAST:
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case IP_DONTFRAG:
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case IP_RECVTOS:
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error = sooptcopyin(sopt, &optval, sizeof optval,
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sizeof optval);
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if (error)
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@ -1047,6 +1048,9 @@ ip_ctloutput(struct socket *so, struct sockopt *sopt)
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case IP_BINDANY:
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OPTSET(INP_BINDANY);
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break;
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case IP_RECVTOS:
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OPTSET(INP_RECVTOS);
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break;
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}
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break;
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#undef OPTSET
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@ -1156,6 +1160,7 @@ ip_ctloutput(struct socket *so, struct sockopt *sopt)
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case IP_ONESBCAST:
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case IP_DONTFRAG:
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case IP_BINDANY:
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case IP_RECVTOS:
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switch (sopt->sopt_name) {
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case IP_TOS:
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@ -1214,6 +1219,9 @@ ip_ctloutput(struct socket *so, struct sockopt *sopt)
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case IP_BINDANY:
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optval = OPTBIT(INP_BINDANY);
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break;
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case IP_RECVTOS:
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optval = OPTBIT(INP_RECVTOS);
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break;
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}
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error = sooptcopyout(sopt, &optval, sizeof optval);
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break;
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