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rtnetlink.7: Various tweaks to Jan Moskyto Matejka's patch 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2020-04-23 21:48:09 +02:00
parent a4c92224ac
commit 00b6e1dd67
1 changed files with 62 additions and 26 deletions
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88
man7/rtnetlink.7
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@ -199,8 +199,8 @@ struct rtmsg {
unsigned char rtm_dst_len; /* Length of destination */
unsigned char rtm_src_len; /* Length of source */
unsigned char rtm_tos; /* TOS filter */
unsigned char rtm_table; /* Routing table ID; see RTA_TABLE below */
unsigned char rtm_table; /* Routing table ID;
see RTA_TABLE below */
unsigned char rtm_protocol; /* Routing protocol; see below */
unsigned char rtm_scope; /* See below */
unsigned char rtm_type; /* See below */
@ -308,7 +308,7 @@ and
.TS
tab(:);
c s s
l l l.
l2 l2 l.
Attributes
rta_type:value type:description
_
@ -321,58 +321,94 @@ RTA_GATEWAY:protocol address:The gateway of the route
RTA_PRIORITY:int:Priority of route.
RTA_PREFSRC:protocol address:Preferred source address.
RTA_METRICS:int:Route metric
RTA_MULTIPATH::Multipath nexthop data (see below).
RTA_MULTIPATH::T{
Multipath nexthop data
.br
(see below).
T}
RTA_PROTOINFO::No longer used
RTA_FLOW:int:Route realm
RTA_CACHEINFO:struct rta_cacheinfo:(see linux/rtnetlink.h)
RTA_SESSION::No longer used
RTA_MP_ALGO::No longer used
RTA_TABLE:int:Routing table ID; if set, rtm_table is ignored.
RTA_TABLE:int:T{
Routing table ID; if set,
.br
rtm_table is ignored
T}
RTA_MARK:int:
RTA_MFC_STATS:struct rta_mfc_stats:(see linux/rtnetlink.h)
RTA_VIA:struct rtvia:Gateway in different AF (see below).
RTA_NEWDST:protocol address:Change packet destination address.
RTA_PREF:char:RFC4191 IPv6 router preference (see below).
RTA_ENCAP_TYPE:short:Encapsulation type for lwtunnels (see below).
RTA_ENCAP::Defined by RTA_ENCAP_TYPE.
RTA_EXPIRES:int:Expire time for IPv6 routes (in seconds).
RTA_VIA:struct rtvia:T{
Gateway in different AF
(see below)
T}
RTA_NEWDST:protocol address:T{
Change packet
destination address
T}
RTA_PREF:char:T{
RFC4191 IPv6 router
preference (see below)
T}
RTA_ENCAP_TYPE:short:T{
Encapsulation type for
.br
lwtunnels (see below)
T}
RTA_ENCAP::Defined by RTA_ENCAP_TYPE
RTA_EXPIRES:int:T{
Expire time for IPv6
routes (in seconds)
T}
.TE
.PP
.I RTA_MULTIPATH
contains several packed instances of
.I struct rtnexthop
together with nested RTA's (RTA_GATEWAY)
.nf
together with nested RTAs
.RB ( RTA_GATEWAY ):
.PP
.in +4n
.EX
struct rtnexthop {
unsigned short rtnh_len; /* Length of struct + length of RTA's
unsigned char rtnh_flags; /* Flags (see linux/rtnetlink.h) */
unsigned char rtnh_hops; /* Nexthop priority */
int rtnh_ifindex; /* Interface index for this nexthop */
unsigned short rtnh_len; /* Length of struct + length
of RTAs */
unsigned char rtnh_flags; /* Flags (see linux/rtnetlink.h) */
unsigned char rtnh_hops; /* Nexthop priority */
int rtnh_ifindex; /* Interface index for this
nexthop */
}
.EE
.in
.PP
There exist a bunch of RTNH_* macros similar to RTA_* and NLHDR_* macros
useful to handle these structures.
.PP
.nf
.in +4n
.EX
struct rtvia {
unsigned short rtvia_family;
unsigned char rtvia_addr[0];
};
.fi
.EE
.in
.PP
.I rtvia_addr
is the address,
.I rtvia_family
is its family type.
.PP
.I RTA_PREF
may contain values ICMPV6_ROUTER_PREF_LOW,
ICMPV6_ROUTER_PREF_MEDIUM and
ICMPV6_ROUTER_PREF_HIGH defined in <linux/icmpv6.h>
.PP
.I RTA_ENCAP_TYPE
may contain values LWTUNNEL_ENCAP_MPLS, LWTUNNEL_ENCAP_IP, LWTUNNEL_ENCAP_ILA or LWTUNNEL_ENCAP_IP6
defined in <linux/lwtunnel.h>
may contain values
LWTUNNEL_ENCAP_MPLS, LWTUNNEL_ENCAP_IP,
LWTUNNEL_ENCAP_ILA or LWTUNNEL_ENCAP_IP6
defined in <linux/lwtunnel.h>.
.sp 1
.B Fill these values in!
.TP