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Introduce a new NET_RT_IFLISTL API to query the address list. It works
on extended and extensible structs if_msghdrl and ifa_msghdrl. This will allow us to extend both the msghdrl structs and eventually if_data in the future without breaking the ABI. Bump __FreeBSD_version to allow ports to more easily detect the new API. Reviewed by: glebius, brooks MFC after: 3 days
This commit is contained in:
Bjoern A. Zeeb
parent
e82cf13bfb
commit
6d076ae8f7
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=231505
@ -28,7 +28,7 @@
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.\" @(#)sysctl.3 8.4 (Berkeley) 5/9/95
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.\" $FreeBSD$
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.\"
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.Dd April 25, 2010
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.Dd February 11, 2012
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.Dt SYSCTL 3
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.Os
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.Sh NAME
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@ -554,6 +554,7 @@ The fifth and sixth level names are as follows:
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.It "NET_RT_DUMP None"
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.It "NET_RT_IFLIST 0 or if_index"
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.It "NET_RT_IFMALIST 0 or if_index"
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.It "NET_RT_IFLISTL 0 or if_index"
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.El
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.Pp
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The
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@ -561,6 +562,19 @@ The
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name returns information about multicast group memberships on all interfaces
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if 0 is specified, or for the interface specified by
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.Va if_index .
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.Pp
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The
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.Dv NET_RT_IFLISTL
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is like
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.Dv NET_RT_IFLIST ,
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just returning message header structs with additional fields allowing the
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interface to be extended without breaking binary compatibility.
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The
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.Dv NET_RT_IFLISTL
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uses 'l' versions of the message header structures:
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.Va struct if_msghdrl
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and
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.Va struct ifa_msghdrl .
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.It Li PF_INET
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Get or set various global information about the IPv4
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(Internet Protocol version 4).
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54
sys/net/if.h
54
sys/net/if.h
@ -244,6 +244,7 @@ struct if_data {
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/*
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* Message format for use in obtaining information about interfaces
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* from getkerninfo and the routing socket
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* For the new, extensible interface see struct if_msghdrl below.
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*/
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struct if_msghdr {
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u_short ifm_msglen; /* to skip over non-understood messages */
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@ -255,9 +256,35 @@ struct if_msghdr {
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struct if_data ifm_data;/* statistics and other data about if */
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};
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/*
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* The 'l' version shall be used by new interfaces, like NET_RT_IFLISTL. It is
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* extensible after ifm_data_off or within ifm_data. Both the if_msghdr and
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* if_data now have a member field detailing the struct length in addition to
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* the routing message length. Macros are provided to find the start of
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* ifm_data and the start of the socket address strucutres immediately following
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* struct if_msghdrl given a pointer to struct if_msghdrl.
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*/
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#define IF_MSGHDRL_IFM_DATA(_l) \
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(struct if_data *)((char *)(_l) + (_l)->ifm_data_off)
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#define IF_MSGHDRL_RTA(_l) \
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(void *)((uintptr_t)(_l) + (_l)->ifm_len)
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struct if_msghdrl {
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u_short ifm_msglen; /* to skip over non-understood messages */
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u_char ifm_version; /* future binary compatibility */
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u_char ifm_type; /* message type */
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int ifm_addrs; /* like rtm_addrs */
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int ifm_flags; /* value of if_flags */
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u_short ifm_index; /* index for associated ifp */
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u_short _ifm_spare1; /* spare space to grow if_index, see if_var.h */
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u_short ifm_len; /* length of if_msghdrl incl. if_data */
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u_short ifm_data_off; /* offset of if_data from beginning */
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struct if_data ifm_data;/* statistics and other data about if */
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};
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/*
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* Message format for use in obtaining information about interface addresses
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* from getkerninfo and the routing socket
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* For the new, extensible interface see struct ifa_msghdrl below.
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*/
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struct ifa_msghdr {
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u_short ifam_msglen; /* to skip over non-understood messages */
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@ -269,6 +296,33 @@ struct ifa_msghdr {
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int ifam_metric; /* value of ifa_metric */
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};
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/*
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* The 'l' version shall be used by new interfaces, like NET_RT_IFLISTL. It is
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* extensible after ifam_metric or within ifam_data. Both the ifa_msghdrl and
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* if_data now have a member field detailing the struct length in addition to
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* the routing message length. Macros are provided to find the start of
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* ifm_data and the start of the socket address strucutres immediately following
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* struct ifa_msghdrl given a pointer to struct ifa_msghdrl.
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*/
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#define IFA_MSGHDRL_IFAM_DATA(_l) \
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(struct if_data *)((char *)(_l) + (_l)->ifam_data_off)
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#define IFA_MSGHDRL_RTA(_l) \
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(void *)((uintptr_t)(_l) + (_l)->ifam_len)
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struct ifa_msghdrl {
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u_short ifam_msglen; /* to skip over non-understood messages */
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u_char ifam_version; /* future binary compatibility */
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u_char ifam_type; /* message type */
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int ifam_addrs; /* like rtm_addrs */
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int ifam_flags; /* value of ifa_flags */
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u_short ifam_index; /* index for associated ifp */
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u_short _ifam_spare1; /* spare space to grow if_index, see if_var.h */
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u_short ifam_len; /* length of ifa_msghdrl incl. if_data */
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u_short ifam_data_off; /* offset of if_data from beginning */
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int ifam_metric; /* value of ifa_metric */
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struct if_data ifam_data;/* statistics and other data about if or
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* address */
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};
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/*
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* Message format for use in obtaining information about multicast addresses
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* from the routing socket
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247
sys/net/rtsock.c
247
sys/net/rtsock.c
@ -115,7 +115,34 @@ struct if_msghdr32 {
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uint16_t ifm_index;
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struct if_data32 ifm_data;
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};
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#endif
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struct if_msghdrl32 {
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uint16_t ifm_msglen;
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uint8_t ifm_version;
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uint8_t ifm_type;
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int32_t ifm_addrs;
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int32_t ifm_flags;
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uint16_t ifm_index;
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uint16_t _ifm_spare1;
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uint16_t ifm_len;
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uint16_t ifm_data_off;
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struct if_data32 ifm_data;
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};
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struct ifa_msghdrl32 {
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uint16_t ifam_msglen;
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uint8_t ifam_version;
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uint8_t ifam_type;
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int32_t ifam_addrs;
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int32_t ifam_flags;
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uint16_t ifam_index;
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uint16_t _ifam_spare1;
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uint16_t ifam_len;
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uint16_t ifam_data_off;
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int32_t ifam_metric;
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struct if_data32 ifam_data;
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};
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#endif /* COMPAT_FREEBSD32 */
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MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
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@ -1014,6 +1041,9 @@ rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
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return (0);
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}
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/*
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* Used by the routing socket.
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*/
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static struct mbuf *
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rt_msg1(int type, struct rt_addrinfo *rtinfo)
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{
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@ -1081,6 +1111,9 @@ rt_msg1(int type, struct rt_addrinfo *rtinfo)
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return (m);
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}
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/*
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* Used by the sysctl code and routing socket.
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*/
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static int
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rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w)
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{
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@ -1094,17 +1127,31 @@ rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w)
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case RTM_DELADDR:
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case RTM_NEWADDR:
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len = sizeof(struct ifa_msghdr);
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if (w != NULL && w->w_op == NET_RT_IFLISTL) {
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#ifdef COMPAT_FREEBSD32
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if (w->w_req->flags & SCTL_MASK32)
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len = sizeof(struct ifa_msghdrl32);
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else
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#endif
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len = sizeof(struct ifa_msghdrl);
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} else
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len = sizeof(struct ifa_msghdr);
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break;
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case RTM_IFINFO:
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#ifdef COMPAT_FREEBSD32
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if (w != NULL && w->w_req->flags & SCTL_MASK32) {
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len = sizeof(struct if_msghdr32);
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if (w->w_op == NET_RT_IFLISTL)
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len = sizeof(struct if_msghdrl32);
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else
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len = sizeof(struct if_msghdr32);
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break;
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}
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#endif
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len = sizeof(struct if_msghdr);
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if (w != NULL && w->w_op == NET_RT_IFLISTL)
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len = sizeof(struct if_msghdrl);
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else
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len = sizeof(struct if_msghdr);
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break;
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case RTM_NEWMADDR:
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@ -1534,6 +1581,147 @@ copy_ifdata32(struct if_data *src, struct if_data32 *dst)
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}
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#endif
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static int
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sysctl_iflist_ifml(struct ifnet *ifp, struct rt_addrinfo *info,
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struct walkarg *w, int len)
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{
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struct if_msghdrl *ifm;
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#ifdef COMPAT_FREEBSD32
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if (w->w_req->flags & SCTL_MASK32) {
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struct if_msghdrl32 *ifm32;
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ifm32 = (struct if_msghdrl32 *)w->w_tmem;
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ifm32->ifm_addrs = info->rti_addrs;
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ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
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ifm32->ifm_index = ifp->if_index;
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ifm32->_ifm_spare1 = 0;
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ifm32->ifm_len = sizeof(*ifm32);
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ifm32->ifm_data_off = offsetof(struct if_msghdrl32, ifm_data);
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copy_ifdata32(&ifp->if_data, &ifm32->ifm_data);
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/* Fixup if_data carp(4) vhid. */
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if (carp_get_vhid_p != NULL)
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ifm32->ifm_data.ifi_vhid =
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(*carp_get_vhid_p)(ifp->if_addr);
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return (SYSCTL_OUT(w->w_req, (caddr_t)ifm32, len));
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}
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#endif
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ifm = (struct if_msghdrl *)w->w_tmem;
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ifm->ifm_addrs = info->rti_addrs;
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ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
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ifm->ifm_index = ifp->if_index;
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ifm->_ifm_spare1 = 0;
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ifm->ifm_len = sizeof(*ifm);
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ifm->ifm_data_off = offsetof(struct if_msghdrl, ifm_data);
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ifm->ifm_data = ifp->if_data;
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/* Fixup if_data carp(4) vhid. */
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if (carp_get_vhid_p != NULL)
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ifm->ifm_data.ifi_vhid = (*carp_get_vhid_p)(ifp->if_addr);
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return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
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}
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static int
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sysctl_iflist_ifm(struct ifnet *ifp, struct rt_addrinfo *info,
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struct walkarg *w, int len)
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{
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struct if_msghdr *ifm;
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#ifdef COMPAT_FREEBSD32
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if (w->w_req->flags & SCTL_MASK32) {
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struct if_msghdr32 *ifm32;
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ifm32 = (struct if_msghdr32 *)w->w_tmem;
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ifm32->ifm_addrs = info->rti_addrs;
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ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
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ifm32->ifm_index = ifp->if_index;
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copy_ifdata32(&ifp->if_data, &ifm32->ifm_data);
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/* Fixup if_data carp(4) vhid. */
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if (carp_get_vhid_p != NULL)
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ifm32->ifm_data.ifi_vhid =
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(*carp_get_vhid_p)(ifp->if_addr);
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return (SYSCTL_OUT(w->w_req, (caddr_t)ifm32, len));
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}
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#endif
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ifm = (struct if_msghdr *)w->w_tmem;
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ifm->ifm_addrs = info->rti_addrs;
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ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
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ifm->ifm_index = ifp->if_index;
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ifm->ifm_data = ifp->if_data;
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/* Fixup if_data carp(4) vhid. */
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if (carp_get_vhid_p != NULL)
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ifm->ifm_data.ifi_vhid = (*carp_get_vhid_p)(ifp->if_addr);
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return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
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}
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static int
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sysctl_iflist_ifaml(struct ifaddr *ifa, struct rt_addrinfo *info,
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struct walkarg *w, int len)
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{
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struct ifa_msghdrl *ifam;
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#ifdef COMPAT_FREEBSD32
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if (w->w_req->flags & SCTL_MASK32) {
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struct ifa_msghdrl32 *ifam32;
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ifam32 = (struct ifa_msghdrl32 *)w->w_tmem;
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ifam32->ifam_addrs = info->rti_addrs;
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ifam32->ifam_flags = ifa->ifa_flags;
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ifam32->ifam_index = ifa->ifa_ifp->if_index;
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ifam32->_ifam_spare1 = 0;
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ifam32->ifam_len = sizeof(*ifam32);
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ifam32->ifam_data_off =
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offsetof(struct ifa_msghdrl32, ifam_data);
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ifam32->ifam_metric = ifa->ifa_metric;
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copy_ifdata32(&ifa->ifa_ifp->if_data, &ifam32->ifam_data);
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/* Fixup if_data carp(4) vhid. */
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if (carp_get_vhid_p != NULL)
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ifam32->ifam_data.ifi_vhid = (*carp_get_vhid_p)(ifa);
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return (SYSCTL_OUT(w->w_req, (caddr_t)ifam32, len));
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}
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#endif
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ifam = (struct ifa_msghdrl *)w->w_tmem;
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ifam->ifam_addrs = info->rti_addrs;
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ifam->ifam_flags = ifa->ifa_flags;
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ifam->ifam_index = ifa->ifa_ifp->if_index;
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ifam->_ifam_spare1 = 0;
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ifam->ifam_len = sizeof(*ifam);
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ifam->ifam_data_off = offsetof(struct ifa_msghdrl, ifam_data);
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ifam->ifam_metric = ifa->ifa_metric;
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ifam->ifam_data = ifa->if_data;
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/* Fixup if_data carp(4) vhid. */
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if (carp_get_vhid_p != NULL)
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ifam->ifam_data.ifi_vhid = (*carp_get_vhid_p)(ifa);
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return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
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}
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static int
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sysctl_iflist_ifam(struct ifaddr *ifa, struct rt_addrinfo *info,
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struct walkarg *w, int len)
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{
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struct ifa_msghdr *ifam;
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ifam = (struct ifa_msghdr *)w->w_tmem;
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ifam->ifam_addrs = info->rti_addrs;
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ifam->ifam_flags = ifa->ifa_flags;
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ifam->ifam_index = ifa->ifa_ifp->if_index;
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ifam->ifam_metric = ifa->ifa_metric;
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return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
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}
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static int
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sysctl_iflist(int af, struct walkarg *w)
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{
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@ -1553,38 +1741,10 @@ sysctl_iflist(int af, struct walkarg *w)
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len = rt_msg2(RTM_IFINFO, &info, NULL, w);
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info.rti_info[RTAX_IFP] = NULL;
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if (w->w_req && w->w_tmem) {
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struct if_msghdr *ifm;
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#ifdef COMPAT_FREEBSD32
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if (w->w_req->flags & SCTL_MASK32) {
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struct if_msghdr32 *ifm32;
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ifm32 = (struct if_msghdr32 *)w->w_tmem;
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ifm32->ifm_index = ifp->if_index;
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ifm32->ifm_flags = ifp->if_flags |
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ifp->if_drv_flags;
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copy_ifdata32(&ifp->if_data, &ifm32->ifm_data);
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if (carp_get_vhid_p != NULL)
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ifm32->ifm_data.ifi_vhid =
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(*carp_get_vhid_p)(ifa);
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ifm32->ifm_addrs = info.rti_addrs;
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error = SYSCTL_OUT(w->w_req, (caddr_t)ifm32,
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len);
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goto sysctl_out;
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}
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#endif
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ifm = (struct if_msghdr *)w->w_tmem;
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ifm->ifm_index = ifp->if_index;
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ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
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ifm->ifm_data = ifp->if_data;
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if (carp_get_vhid_p != NULL)
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ifm->ifm_data.ifi_vhid =
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(*carp_get_vhid_p)(ifa);
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ifm->ifm_addrs = info.rti_addrs;
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error = SYSCTL_OUT(w->w_req, (caddr_t)ifm, len);
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#ifdef COMPAT_FREEBSD32
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sysctl_out:
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#endif
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if (w->w_op == NET_RT_IFLISTL)
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error = sysctl_iflist_ifml(ifp, &info, w, len);
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else
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error = sysctl_iflist_ifm(ifp, &info, w, len);
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if (error)
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goto done;
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}
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@ -1599,14 +1759,12 @@ sysctl_iflist(int af, struct walkarg *w)
|
||||
info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
|
||||
len = rt_msg2(RTM_NEWADDR, &info, NULL, w);
|
||||
if (w->w_req && w->w_tmem) {
|
||||
struct ifa_msghdr *ifam;
|
||||
|
||||
ifam = (struct ifa_msghdr *)w->w_tmem;
|
||||
ifam->ifam_index = ifa->ifa_ifp->if_index;
|
||||
ifam->ifam_flags = ifa->ifa_flags;
|
||||
ifam->ifam_metric = ifa->ifa_metric;
|
||||
ifam->ifam_addrs = info.rti_addrs;
|
||||
error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
|
||||
if (w->w_op == NET_RT_IFLISTL)
|
||||
error = sysctl_iflist_ifaml(ifa, &info,
|
||||
w, len);
|
||||
else
|
||||
error = sysctl_iflist_ifam(ifa, &info,
|
||||
w, len);
|
||||
if (error)
|
||||
goto done;
|
||||
}
|
||||
@ -1736,6 +1894,7 @@ sysctl_rtsock(SYSCTL_HANDLER_ARGS)
|
||||
break;
|
||||
|
||||
case NET_RT_IFLIST:
|
||||
case NET_RT_IFLISTL:
|
||||
error = sysctl_iflist(af, &w);
|
||||
break;
|
||||
|
||||
|
||||
@ -58,7 +58,7 @@
|
||||
* in the range 5 to 9.
|
||||
*/
|
||||
#undef __FreeBSD_version
|
||||
#define __FreeBSD_version 1000007 /* Master, propagated to newvers */
|
||||
#define __FreeBSD_version 1000008 /* Master, propagated to newvers */
|
||||
|
||||
/*
|
||||
* __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,
|
||||
|
||||
@ -396,7 +396,9 @@ struct sockproto {
|
||||
#define NET_RT_FLAGS 2 /* by flags, e.g. RESOLVING */
|
||||
#define NET_RT_IFLIST 3 /* survey interface list */
|
||||
#define NET_RT_IFMALIST 4 /* return multicast address list */
|
||||
#define NET_RT_MAXID 5
|
||||
#define NET_RT_IFLISTL 5 /* Survey interface list, using 'l'en
|
||||
* versions of msghdr structs. */
|
||||
#define NET_RT_MAXID 6
|
||||
|
||||
#define CTL_NET_RT_NAMES { \
|
||||
{ 0, 0 }, \
|
||||
@ -404,6 +406,7 @@ struct sockproto {
|
||||
{ "flags", CTLTYPE_STRUCT }, \
|
||||
{ "iflist", CTLTYPE_STRUCT }, \
|
||||
{ "ifmalist", CTLTYPE_STRUCT }, \
|
||||
{ "iflist2", CTLTYPE_STRUCT }, \
|
||||
}
|
||||
#endif /* __BSD_VISIBLE */
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user