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BGP: Deprecate 'missing lladdr' option

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The option is not implemented since transition to 2.0 and no plan to add it.
Also remove some deprecated RTS_* valus from documentation.

Thanks to Sébastien Parisot for notification.
This commit is contained in:
Ondrej Zajicek (work) 2021-01-06 14:44:23 +01:00
parent 21f9acd2a0
commit 4155104c90
4 changed files with 5 additions and 26 deletions
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19
doc/bird.sgml
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@ -1647,9 +1647,8 @@ Common route attributes are:
<tag><label id="rta-source"><m/enum/ source</tag>
what protocol has told me about this route. Possible values:
<cf/RTS_DUMMY/, <cf/RTS_STATIC/, <cf/RTS_INHERIT/, <cf/RTS_DEVICE/,
<cf/RTS_STATIC_DEVICE/, <cf/RTS_REDIRECT/, <cf/RTS_RIP/, <cf/RTS_OSPF/,
<cf/RTS_OSPF_IA/, <cf/RTS_OSPF_EXT1/, <cf/RTS_OSPF_EXT2/, <cf/RTS_BGP/,
<cf/RTS_PIPE/, <cf/RTS_BABEL/.
<cf/RTS_RIP/, <cf/RTS_OSPF/, <cf/RTS_OSPF_IA/, <cf/RTS_OSPF_EXT1/,
<cf/RTS_OSPF_EXT2/, <cf/RTS_BGP/, <cf/RTS_PIPE/, <cf/RTS_BABEL/.
<tag><label id="rta-dest"><m/enum/ dest</tag>
Type of destination the packets should be sent to
@ -2705,20 +2704,6 @@ be used in explicit configuration.
BGP session (if acceptable), or the preferred address of an associated
interface.
<tag><label id="bgp-missing-lladdr">missing lladdr self|drop|ignore</tag>
Next Hop attribute in BGP-IPv6 sometimes contains just the global IPv6
address, but sometimes it has to contain both global and link-local IPv6
addresses. This option specifies what to do if BIRD have to send both
addresses but does not know link-local address. This situation might
happen when routes from other protocols are exported to BGP, or when
improper updates are received from BGP peers. <cf/self/ means that BIRD
advertises its own local address instead. <cf/drop/ means that BIRD
skips that prefixes and logs error. <cf/ignore/ means that BIRD ignores
the problem and sends just the global address (and therefore forms
improper BGP update). Default: <cf/self/, unless BIRD is configured as a
route server (option <cf/rs client/), in that case default is <cf/ignore/,
because route servers usually do not forward packets themselves.
<tag><label id="bgp-gateway">gateway direct|recursive</tag>
For received routes, their <cf/gw/ (immediate next hop) attribute is
computed from received <cf/bgp_next_hop/ attribute. This option

5
proto/bgp/bgp.c
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@ -1986,10 +1986,6 @@ bgp_postconfig(struct proto_config *CF)
if (cc->next_hop_keep == 0xff)
cc->next_hop_keep = cf->rr_client ? NH_IBGP : (cf->rs_client ? NH_ALL : NH_NO);
/* Different default based on rs_client */
if (!cc->missing_lladdr)
cc->missing_lladdr = cf->rs_client ? MLL_IGNORE : MLL_SELF;
/* Different default for gw_mode */
if (!cc->gw_mode)
cc->gw_mode = cf->multihop ? GW_RECURSIVE : GW_DIRECT;
@ -2131,7 +2127,6 @@ bgp_channel_reconfigure(struct channel *C, struct channel_config *CC, int *impor
if (!ipa_equal(new->next_hop_addr, old->next_hop_addr) ||
(new->next_hop_self != old->next_hop_self) ||
(new->next_hop_keep != old->next_hop_keep) ||
(new->missing_lladdr != old->missing_lladdr) ||
(new->aigp != old->aigp) ||
(new->aigp_originate != old->aigp_originate))
*export_changed = 1;

1
proto/bgp/bgp.h
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@ -143,7 +143,6 @@ struct bgp_channel_config {
u8 next_hop_self; /* Always set next hop to local IP address (NH_*) */
u8 next_hop_keep; /* Do not modify next hop attribute (NH_*) */
u8 mandatory; /* Channel is mandatory in capability negotiation */
u8 missing_lladdr; /* What we will do when we don' know link-local addr, see MLL_* */
u8 gw_mode; /* How we compute route gateway from next_hop attr, see GW_* */
u8 secondary; /* Accept also non-best routes (i.e. RA_ACCEPTED) */
u8 gr_able; /* Allow full graceful restart for the channel */

6
proto/bgp/config.Y
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@ -241,15 +241,15 @@ bgp_nh:
| IBGP { $$ = NH_IBGP; }
| EBGP { $$ = NH_EBGP; }
bgp_lladdr: SELF | DROP | IGNORE;
bgp_channel_item:
channel_item
| NEXT HOP ADDRESS ipa { BGP_CC->next_hop_addr = $4; }
| NEXT HOP SELF bgp_nh { BGP_CC->next_hop_self = $4; }
| NEXT HOP KEEP bgp_nh { BGP_CC->next_hop_keep = $4; }
| MANDATORY bool { BGP_CC->mandatory = $2; }
| MISSING LLADDR SELF { BGP_CC->missing_lladdr = MLL_SELF; }
| MISSING LLADDR DROP { BGP_CC->missing_lladdr = MLL_DROP; }
| MISSING LLADDR IGNORE { BGP_CC->missing_lladdr = MLL_IGNORE; }
| MISSING LLADDR bgp_lladdr { log(L_WARN "%s.%s: Missing lladdr option is deprecated and ignored, remove it", this_proto->name, this_channel->name); }
| GATEWAY DIRECT { BGP_CC->gw_mode = GW_DIRECT; }
| GATEWAY RECURSIVE { BGP_CC->gw_mode = GW_RECURSIVE; }
| SECONDARY bool { BGP_CC->secondary = $2; }