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Merge commit '333ddd4f' into mq-aggregator-for-v3

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This commit is contained in:
Maria Matejka 2023-11-01 18:34:06 +01:00
commit 3611555883
21 changed files with 1488 additions and 18 deletions
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4
conf/cf-lex.l
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@ -858,6 +858,10 @@ cf_symbol_class_name(struct symbol *sym)
return "routing table"; return "routing table";
case SYM_ATTRIBUTE: case SYM_ATTRIBUTE:
return "custom attribute"; return "custom attribute";
case SYM_MPLS_DOMAIN:
return "MPLS domain";
case SYM_MPLS_RANGE:
return "MPLS label range";
case SYM_CONSTANT_RANGE: case SYM_CONSTANT_RANGE:
return "constant"; return "constant";
case SYM_VARIABLE_RANGE: case SYM_VARIABLE_RANGE:

4
conf/conf.c
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@ -49,6 +49,7 @@
#include "nest/route.h" #include "nest/route.h"
#include "nest/protocol.h" #include "nest/protocol.h"
#include "nest/iface.h" #include "nest/iface.h"
#include "nest/mpls.h"
#include "lib/resource.h" #include "lib/resource.h"
#include "lib/string.h" #include "lib/string.h"
#include "lib/event.h" #include "lib/event.h"
@ -139,6 +140,7 @@ config_parse(struct config *c)
cf_lex_init(0, c); cf_lex_init(0, c);
sysdep_preconfig(c); sysdep_preconfig(c);
protos_preconfig(c); protos_preconfig(c);
mpls_preconfig(c);
rt_preconfig(c); rt_preconfig(c);
cf_parse(); cf_parse();
rt_postconfig(c); rt_postconfig(c);
@ -299,6 +301,7 @@ config_do_commit(struct config *c, int type)
int force_restart = sysdep_commit(c, old_config); int force_restart = sysdep_commit(c, old_config);
DBG("global_commit\n"); DBG("global_commit\n");
force_restart |= global_commit(c, old_config); force_restart |= global_commit(c, old_config);
mpls_commit(c, old_config);
DBG("rt_commit\n"); DBG("rt_commit\n");
rt_commit(c, old_config); rt_commit(c, old_config);
DBG("protos_commit\n"); DBG("protos_commit\n");
@ -547,6 +550,7 @@ order_shutdown(int gr)
memcpy(c, config, sizeof(struct config)); memcpy(c, config, sizeof(struct config));
init_list(&c->protos); init_list(&c->protos);
init_list(&c->tables); init_list(&c->tables);
init_list(&c->mpls_domains);
init_list(&c->symbols); init_list(&c->symbols);
memset(c->def_tables, 0, sizeof(c->def_tables)); memset(c->def_tables, 0, sizeof(c->def_tables));
c->shutdown = 1; c->shutdown = 1;

5
conf/conf.h
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@ -21,6 +21,7 @@ struct config {
linpool *mem; /* Linear pool containing configuration data */ linpool *mem; /* Linear pool containing configuration data */
list protos; /* Configured protocol instances (struct proto_config) */ list protos; /* Configured protocol instances (struct proto_config) */
list tables; /* Configured routing tables (struct rtable_config) */ list tables; /* Configured routing tables (struct rtable_config) */
list mpls_domains; /* Configured MPLS domains (struct mpls_domain_config) */
list logfiles; /* Configured log files (sysdep) */ list logfiles; /* Configured log files (sysdep) */
list tests; /* Configured unit tests (f_bt_test_suite) */ list tests; /* Configured unit tests (f_bt_test_suite) */
list symbols; /* Configured symbols in config order */ list symbols; /* Configured symbols in config order */
@ -128,6 +129,8 @@ struct symbol {
const struct filter *filter; /* For SYM_FILTER */ const struct filter *filter; /* For SYM_FILTER */
struct rtable_config *table; /* For SYM_TABLE */ struct rtable_config *table; /* For SYM_TABLE */
struct f_dynamic_attr *attribute; /* For SYM_ATTRIBUTE */ struct f_dynamic_attr *attribute; /* For SYM_ATTRIBUTE */
struct mpls_domain_config *mpls_domain; /* For SYM_MPLS_DOMAIN */
struct mpls_range_config *mpls_range; /* For SYM_MPLS_RANGE */
struct f_val *val; /* For SYM_CONSTANT */ struct f_val *val; /* For SYM_CONSTANT */
uint offset; /* For SYM_VARIABLE */ uint offset; /* For SYM_VARIABLE */
const struct keyword *keyword; /* For SYM_KEYWORD */ const struct keyword *keyword; /* For SYM_KEYWORD */
@ -167,6 +170,8 @@ extern linpool *global_root_scope_linpool;
#define SYM_ATTRIBUTE 6 #define SYM_ATTRIBUTE 6
#define SYM_KEYWORD 7 #define SYM_KEYWORD 7
#define SYM_METHOD 8 #define SYM_METHOD 8
#define SYM_MPLS_DOMAIN 9
#define SYM_MPLS_RANGE 10
#define SYM_VARIABLE 0x100 /* 0x100-0x1ff are variable types */ #define SYM_VARIABLE 0x100 /* 0x100-0x1ff are variable types */
#define SYM_VARIABLE_RANGE SYM_VARIABLE ... (SYM_VARIABLE | 0xff) #define SYM_VARIABLE_RANGE SYM_VARIABLE ... (SYM_VARIABLE | 0xff)

2
conf/confbase.Y
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@ -43,6 +43,8 @@ static inline void cf_assert_symbol(const struct symbol *sym, uint class) {
case SYM_FILTER: cf_assert(sym->class == SYM_FILTER, "Filter name required"); break; case SYM_FILTER: cf_assert(sym->class == SYM_FILTER, "Filter name required"); break;
case SYM_TABLE: cf_assert(sym->class == SYM_TABLE, "Table name required"); break; case SYM_TABLE: cf_assert(sym->class == SYM_TABLE, "Table name required"); break;
case SYM_ATTRIBUTE: cf_assert(sym->class == SYM_ATTRIBUTE, "Custom attribute name required"); break; case SYM_ATTRIBUTE: cf_assert(sym->class == SYM_ATTRIBUTE, "Custom attribute name required"); break;
case SYM_MPLS_DOMAIN: cf_assert(sym->class == SYM_MPLS_DOMAIN, "MPLS domain name required"); break;
case SYM_MPLS_RANGE: cf_assert(sym->class == SYM_MPLS_RANGE, "MPLS range name required"); break;
case SYM_VARIABLE: cf_assert((sym->class & ~0xff) == SYM_VARIABLE, "Variable name required"); break; case SYM_VARIABLE: cf_assert((sym->class & ~0xff) == SYM_VARIABLE, "Variable name required"); break;
case SYM_CONSTANT: cf_assert((sym->class & ~0xff) == SYM_CONSTANT, "Constant name required"); break; case SYM_CONSTANT: cf_assert((sym->class & ~0xff) == SYM_CONSTANT, "Constant name required"); break;
default: bug("This shall not happen"); default: bug("This shall not happen");

1
filter/data.h
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@ -41,6 +41,7 @@ enum f_type {
T_ENUM_NETTYPE = 0x36, T_ENUM_NETTYPE = 0x36,
T_ENUM_RA_PREFERENCE = 0x37, T_ENUM_RA_PREFERENCE = 0x37,
T_ENUM_AF = 0x38, T_ENUM_AF = 0x38,
T_ENUM_MPLS_POLICY = 0x39,
/* new enums go here */ /* new enums go here */
T_ENUM_EMPTY = 0x3f, /* Special hack for atomic_aggr */ T_ENUM_EMPTY = 0x3f, /* Special hack for atomic_aggr */

2
lib/ip.h
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@ -385,6 +385,8 @@ static inline ip6_addr ip6_hton(ip6_addr a)
static inline ip6_addr ip6_ntoh(ip6_addr a) static inline ip6_addr ip6_ntoh(ip6_addr a)
{ return _MI6(ntohl(_I0(a)), ntohl(_I1(a)), ntohl(_I2(a)), ntohl(_I3(a))); } { return _MI6(ntohl(_I0(a)), ntohl(_I1(a)), ntohl(_I2(a)), ntohl(_I3(a))); }
#define MPLS_MAX_LABEL 0x100000
#define MPLS_MAX_LABEL_STACK 8 #define MPLS_MAX_LABEL_STACK 8
typedef struct mpls_label_stack { typedef struct mpls_label_stack {
uint len; uint len;

1
nest/Doc
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@ -6,6 +6,7 @@ D proto.sgml
S proto.c S proto.c
S proto-hooks.c S proto-hooks.c
S iface.c S iface.c
S mpls.c
S neighbor.c S neighbor.c
S cli.c S cli.c
S locks.c S locks.c

3
nest/Makefile
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@ -1,7 +1,8 @@
src := a-path.c a-set.c cli.c cmds.c iface.c locks.c neighbor.c password.c proto.c proto-build.c rt-attr.c rt-dev.c rt-fib.c rt-show.c rt-table.c src := a-path.c a-set.c cli.c cmds.c iface.c locks.c mpls.c neighbor.c password.c proto.c proto-build.c rt-attr.c rt-dev.c rt-fib.c rt-show.c rt-table.c
obj := $(src-o-files) obj := $(src-o-files)
$(all-daemon) $(all-daemon)
$(cf-local) $(cf-local)
$(conf-y-targets): $(s)mpls.Y
$(o)proto-build.c: Makefile $(lastword $(MAKEFILE_LIST)) $(objdir)/.dir-stamp $(o)proto-build.c: Makefile $(lastword $(MAKEFILE_LIST)) $(objdir)/.dir-stamp
$(E)echo GEN $@ $(E)echo GEN $@

17
nest/config.Y
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@ -12,6 +12,7 @@ CF_HDR
#include "nest/rt-dev.h" #include "nest/rt-dev.h"
#include "nest/password.h" #include "nest/password.h"
#include "nest/cmds.h" #include "nest/cmds.h"
#include "nest/mpls.h"
#include "lib/lists.h" #include "lib/lists.h"
#include "lib/mac.h" #include "lib/mac.h"
@ -126,6 +127,7 @@ CF_KEYWORDS(GRACEFUL, RESTART, WAIT, MAX, AS)
CF_KEYWORDS(MIN, IDLE, RX, TX, INTERVAL, MULTIPLIER, PASSIVE) CF_KEYWORDS(MIN, IDLE, RX, TX, INTERVAL, MULTIPLIER, PASSIVE)
CF_KEYWORDS(CHECK, LINK) CF_KEYWORDS(CHECK, LINK)
CF_KEYWORDS(SORTED, TRIE, MIN, MAX, SETTLE, TIME, GC, THRESHOLD, PERIOD) CF_KEYWORDS(SORTED, TRIE, MIN, MAX, SETTLE, TIME, GC, THRESHOLD, PERIOD)
CF_KEYWORDS(MPLS_LABEL, MPLS_POLICY, MPLS_CLASS)
/* For r_args_channel */ /* For r_args_channel */
CF_KEYWORDS(IPV4, IPV4_MC, IPV4_MPLS, IPV6, IPV6_MC, IPV6_MPLS, IPV6_SADR, VPN4, VPN4_MC, VPN4_MPLS, VPN6, VPN6_MC, VPN6_MPLS, ROA4, ROA6, FLOW4, FLOW6, MPLS, PRI, SEC) CF_KEYWORDS(IPV4, IPV4_MC, IPV4_MPLS, IPV6, IPV6_MC, IPV6_MPLS, IPV6_SADR, VPN4, VPN4_MC, VPN4_MPLS, VPN6, VPN6_MC, VPN6_MPLS, ROA4, ROA6, FLOW4, FLOW6, MPLS, PRI, SEC)
@ -136,6 +138,7 @@ CF_ENUM(T_ENUM_SCOPE, SCOPE_, HOST, LINK, SITE, ORGANIZATION, UNIVERSE, UNDEFINE
CF_ENUM(T_ENUM_RTD, RTD_, UNICAST, BLACKHOLE, UNREACHABLE, PROHIBIT) CF_ENUM(T_ENUM_RTD, RTD_, UNICAST, BLACKHOLE, UNREACHABLE, PROHIBIT)
CF_ENUM(T_ENUM_ROA, ROA_, UNKNOWN, VALID, INVALID) CF_ENUM(T_ENUM_ROA, ROA_, UNKNOWN, VALID, INVALID)
CF_ENUM_PX(T_ENUM_AF, AF_, AFI_, IPV4, IPV6) CF_ENUM_PX(T_ENUM_AF, AF_, AFI_, IPV4, IPV6)
CF_ENUM(T_ENUM_MPLS_POLICY, MPLS_POLICY_, NONE, STATIC, PREFIX, AGGREGATE)
%type <i32> idval %type <i32> idval
%type <f> imexport %type <f> imexport
@ -143,7 +146,7 @@ CF_ENUM_PX(T_ENUM_AF, AF_, AFI_, IPV4, IPV6)
%type <s> optproto %type <s> optproto
%type <ra> r_args %type <ra> r_args
%type <sd> sym_args %type <sd> sym_args
%type <i> proto_start echo_mask echo_size debug_mask debug_list debug_flag mrtdump_mask mrtdump_list mrtdump_flag export_mode limit_action net_type tos password_algorithm %type <i> proto_start echo_mask echo_size debug_mask debug_list debug_flag mrtdump_mask mrtdump_list mrtdump_flag export_mode limit_action net_type net_type_base tos password_algorithm
%type <ps> proto_patt proto_patt2 %type <ps> proto_patt proto_patt2
%type <cc> channel_start proto_channel %type <cc> channel_start proto_channel
%type <cl> limit_spec %type <cl> limit_spec
@ -188,7 +191,7 @@ gr_opts: GRACEFUL RESTART WAIT expr ';' { new_config->gr_wait = $4; } ;
/* Network types (for tables, channels) */ /* Network types (for tables, channels) */
net_type: net_type_base:
IPV4 { $$ = NET_IP4; } IPV4 { $$ = NET_IP4; }
| IPV6 { $$ = NET_IP6; } | IPV6 { $$ = NET_IP6; }
| IPV6 SADR { $$ = NET_IP6_SADR; } | IPV6 SADR { $$ = NET_IP6_SADR; }
@ -198,6 +201,10 @@ net_type:
| ROA6 { $$ = NET_ROA6; } | ROA6 { $$ = NET_ROA6; }
| FLOW4{ $$ = NET_FLOW4; } | FLOW4{ $$ = NET_FLOW4; }
| FLOW6{ $$ = NET_FLOW6; } | FLOW6{ $$ = NET_FLOW6; }
;
net_type:
net_type_base
| MPLS { $$ = NET_MPLS; } | MPLS { $$ = NET_MPLS; }
; ;
@ -296,7 +303,7 @@ proto_item:
; ;
channel_start: net_type channel_start: net_type_base
{ {
$$ = this_channel = channel_config_get(NULL, net_label[$1], $1, this_proto); $$ = this_channel = channel_config_get(NULL, net_label[$1], $1, this_proto);
}; };
@ -930,6 +937,10 @@ proto_patt2:
dynamic_attr: IGP_METRIC { $$ = f_new_dynamic_attr(EAF_TYPE_INT, T_INT, EA_GEN_IGP_METRIC); } ; dynamic_attr: IGP_METRIC { $$ = f_new_dynamic_attr(EAF_TYPE_INT, T_INT, EA_GEN_IGP_METRIC); } ;
dynamic_attr: MPLS_LABEL { $$ = f_new_dynamic_attr(EAF_TYPE_INT, T_INT, EA_MPLS_LABEL); } ;
dynamic_attr: MPLS_POLICY { $$ = f_new_dynamic_attr(EAF_TYPE_INT, T_ENUM_MPLS_POLICY, EA_MPLS_POLICY); } ;
dynamic_attr: MPLS_CLASS { $$ = f_new_dynamic_attr(EAF_TYPE_INT, T_INT, EA_MPLS_CLASS); } ;
CF_CODE CF_CODE

141
nest/mpls.Y Normal file
View File

@ -0,0 +1,141 @@
/*
* BIRD Internet Routing Daemon -- MPLS Structures
*
* (c) 2022 Ondrej Zajicek <santiago@crfreenet.org>
* (c) 2022 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
CF_HDR
#include "nest/mpls.h"
CF_DEFINES
static struct mpls_domain_config *this_mpls_domain;
static struct mpls_range_config *this_mpls_range;
#define MPLS_CC ((struct mpls_channel_config *) this_channel)
CF_DECLS
CF_KEYWORDS(MPLS, DOMAIN, LABEL, RANGE, STATIC, DYNAMIC, START, LENGTH, POLICY, PREFIX, AGGREGATE)
%type <i> mpls_label_policy
%type <cc> mpls_channel_start mpls_channel
CF_GRAMMAR
conf: mpls_domain;
mpls_domain: mpls_domain_start mpls_domain_opt_list mpls_domain_end;
mpls_domain_start: MPLS DOMAIN symbol { this_mpls_domain = mpls_domain_config_new($3); };
mpls_domain_opt:
mpls_range
;
mpls_domain_opts:
/* empty */
| mpls_domain_opts mpls_domain_opt ';'
;
mpls_domain_opt_list:
/* empty */
| '{' mpls_domain_opts '}'
;
mpls_domain_end: { mpls_domain_postconfig(this_mpls_domain); this_mpls_domain = NULL; };
mpls_range: mpls_range_start mpls_range_opt_list mpls_range_end;
mpls_range_start: LABEL RANGE symbol
{
if (($3->class == SYM_KEYWORD) && ($3->keyword->value == STATIC))
this_mpls_range = this_mpls_domain->static_range;
else if (($3->class == SYM_KEYWORD) && ($3->keyword->value == DYNAMIC))
this_mpls_range = this_mpls_domain->dynamic_range;
else
this_mpls_range = mpls_range_config_new(this_mpls_domain, $3);
};
mpls_range_opt:
START expr { this_mpls_range->start = $2; if ($2 >= MPLS_MAX_LABEL) cf_error("MPLS label range start must be less than 2^20"); }
| LENGTH expr { this_mpls_range->length = $2; if ($2 >= MPLS_MAX_LABEL) cf_error("MPLS label range length must be less than 2^20"); if (!$2) cf_error("MPLS label range length must be nonzero"); }
;
mpls_range_opts:
/* empty */
| mpls_range_opts mpls_range_opt ';'
;
mpls_range_opt_list:
/* empty */
| '{' mpls_range_opts '}'
;
mpls_range_end:
{
struct mpls_range_config *r = this_mpls_range;
if ((r->start == (uint) -1) || (r->length == (uint) -1))
cf_error("MPLS label range start and length must be specified");
if (r->start + r->length > MPLS_MAX_LABEL)
cf_error("MPLS label range end must be less than 2^20");
this_mpls_range = NULL;
};
mpls_channel: mpls_channel_start mpls_channel_opt_list mpls_channel_end;
mpls_channel_start: MPLS
{
$$ = this_channel = channel_config_get(&channel_mpls, net_label[NET_MPLS], NET_MPLS, this_proto);
if (EMPTY_LIST(new_config->mpls_domains))
cf_error("No MPLS domain defined");
/* Default values for new channel */
if (!MPLS_CC->domain)
{
MPLS_CC->domain = cf_default_mpls_domain(new_config);
MPLS_CC->label_policy = MPLS_POLICY_PREFIX;
}
};
mpls_label_policy:
STATIC { $$ = MPLS_POLICY_STATIC; }
| PREFIX { $$ = MPLS_POLICY_PREFIX; }
| AGGREGATE { $$ = MPLS_POLICY_AGGREGATE; }
;
mpls_channel_opt:
channel_item
| DOMAIN symbol_known { cf_assert_symbol($2, SYM_MPLS_DOMAIN); MPLS_CC->domain = $2->mpls_domain; }
| LABEL RANGE symbol_known { cf_assert_symbol($3, SYM_MPLS_RANGE); MPLS_CC->range = $3->mpls_range; }
| LABEL RANGE STATIC { MPLS_CC->range = MPLS_CC->domain->static_range; }
| LABEL RANGE DYNAMIC { MPLS_CC->range = MPLS_CC->domain->dynamic_range; }
| LABEL POLICY mpls_label_policy { MPLS_CC->label_policy = $3; }
;
mpls_channel_opts:
/* empty */
| mpls_channel_opts mpls_channel_opt ';'
;
mpls_channel_opt_list:
/* empty */
| '{' mpls_channel_opts '}'
;
mpls_channel_end: { mpls_channel_postconfig(this_channel); } channel_end;
CF_CODE
CF_END

998
nest/mpls.c Normal file
View File

@ -0,0 +1,998 @@
/*
* BIRD Internet Routing Daemon -- MPLS Structures
*
* (c) 2022 Ondrej Zajicek <santiago@crfreenet.org>
* (c) 2022 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/**
* DOC: MPLS
*
* The MPLS subsystem manages MPLS labels and handles their allocation to
* MPLS-aware routing protocols. These labels are then attached to IP or VPN
* routes representing label switched paths -- LSPs. MPLS labels are also used
* in special MPLS routes (which use labels as network address) that are
* exported to MPLS routing table in kernel. The MPLS subsystem consists of MPLS
* domains (struct &mpls_domain), MPLS channels (struct &mpls_channel) and FEC
* maps (struct &mpls_fec_map).
*
* The MPLS domain represents one MPLS label address space, implements the label
* allocator, and handles associated configuration and management. The domain is
* declared in the configuration (struct &mpls_domain_config). There might be
* multiple MPLS domains representing separate label spaces, but in most cases
* one domain is enough. MPLS-aware protocols and routing tables are associated
* with a specific MPLS domain.
*
* The MPLS domain has configurable label ranges (struct &mpls_range), by
* default it has two ranges: static (16-1000) and dynamic (1000-10000). When
* a protocol wants to allocate labels, it first acquires a handle (struct
* &mpls_handle) for a specific range using mpls_new_handle(), and then it
* allocates labels from that with mpls_new_label(). When not needed, labels are
* freed by mpls_free_label() and the handle is released by mpls_free_handle().
* Note that all labels and handles must be freed manually.
*
* Both MPLS domain and MPLS range are reference counted, so when deconfigured
* they could be freed just after all labels and ranges are freed. Users are
* expected to hold a reference to a MPLS domain for whole time they use
* something from that domain (e.g. &mpls_handle), but releasing reference to
* a range while holding associated handle is OK.
*
* The MPLS channel is subclass of a generic protocol channel. It has two
* distinct purposes - to handle per-protocol MPLS configuration (e.g. which
* MPLS domain is associated with the protocol, which label range is used by the
* protocol), and to announce MPLS routes to a routing table (as a regular
* protocol channel).
*
* The FEC map is a helper structure that maps forwarding equivalent classes
* (FECs) to MPLS labels. It is an internal matter of a routing protocol how to
* assign meaning to allocated labels, announce LSP routes and associated MPLS
* routes (i.e. ILM entries). But the common behavior is implemented in the FEC
* map, which can be used by the protocols that work with IP-prefix-based FECs.
*
* The FEC map keeps hash tables of FECs (struct &mpls_fec) based on network
* prefix, next hop eattr and assigned label. It has three labeling policies:
* static assignment (%MPLS_POLICY_STATIC), per-prefix policy (%MPLS_POLICY_PREFIX),
* and aggregating policy (%MPLS_POLICY_AGGREGATE). In per-prefix policy, each
* distinct LSP is a separate FEC and uses a separate label, which is kept even
* if the next hop of the LSP changes. In aggregating policy, LSPs with a same
* next hop form one FEC and use one label, but when a next hop (or remote
* label) of such LSP changes then the LSP must be moved to a different FEC and
* assigned a different label.
*
* The overall process works this way: A protocol wants to announce a LSP route,
* it does that by announcing e.g. IP route with %EA_MPLS_POLICY attribute.
* After the route is accepted by filters (which may also change the policy
* attribute or set a static label), the mpls_handle_rte() is called from
* rte_update2(), which applies selected labeling policy, finds existing FEC or
* creates a new FEC (which includes allocating new label and announcing related
* MPLS route by mpls_announce_fec()), and attach FEC label to the LSP route.
* After that, the LSP route is stored in routing table by rte_recalculate().
* Changes in routing tables trigger mpls_rte_insert() and mpls_rte_remove()
* hooks, which refcount FEC structures and possibly trigger removal of FECs
* and withdrawal of MPLS routes.
*
* TODO:
* - show mpls labels CLI command
* - label range non-intersection check
* - better range reconfigurations (allow reduce ranges over unused labels)
* - protocols should do route refresh instead of resetart when reconfiguration
* requires changing labels (e.g. different label range)
* - registering static allocations
* - checking range in static allocations
* - special handling of reserved labels
*/
#include "nest/bird.h"
#include "nest/route.h"
#include "nest/mpls.h"
static struct mpls_range *mpls_new_range(struct mpls_domain *m, struct mpls_range_config *cf);
static struct mpls_range *mpls_find_range_(list *l, const char *name);
static int mpls_reconfigure_range(struct mpls_domain *m, struct mpls_range *r, struct mpls_range_config *cf);
static void mpls_remove_range(struct mpls_range *r);
/*
* MPLS domain
*/
list mpls_domains;
void
mpls_init(void)
{
init_list(&mpls_domains);
}
struct mpls_domain_config *
mpls_domain_config_new(struct symbol *s)
{
struct mpls_domain_config *mc = cfg_allocz(sizeof(struct mpls_domain_config));
struct mpls_range_config *rc;
cf_define_symbol(new_config, s, SYM_MPLS_DOMAIN, mpls_domain, mc);
mc->name = s->name;
init_list(&mc->ranges);
/* Predefined static range */
rc = mpls_range_config_new(mc, NULL);
rc->name = "static";
rc->start = 16;
rc->length = 984;
mc->static_range = rc;
/* Predefined dynamic range */
rc = mpls_range_config_new(mc, NULL);
rc->name = "dynamic";
rc->start = 1000;
rc->length = 9000;
mc->dynamic_range = rc;
add_tail(&new_config->mpls_domains, &mc->n);
return mc;
}
void
mpls_domain_postconfig(struct mpls_domain_config *cf UNUSED)
{
/* Add label range non-intersection check */
}
static struct mpls_domain *
mpls_new_domain(struct mpls_domain_config *cf)
{
struct pool *p = rp_new(&root_pool, "MPLS domain");
struct mpls_domain *m = mb_allocz(p, sizeof(struct mpls_domain));
m->cf = cf;
m->name = cf->name;
m->pool = p;
lmap_init(&m->labels, p);
lmap_set(&m->labels, 0);
init_list(&m->ranges);
init_list(&m->handles);
struct mpls_range_config *rc;
WALK_LIST(rc, cf->ranges)
mpls_new_range(m, rc);
add_tail(&mpls_domains, &m->n);
cf->domain = m;
return m;
}
static struct mpls_domain *
mpls_find_domain_(list *l, const char *name)
{
struct mpls_domain *m;
WALK_LIST(m, *l)
if (!strcmp(m->name, name))
return m;
return NULL;
}
static int
mpls_reconfigure_domain(struct mpls_domain *m, struct mpls_domain_config *cf)
{
cf->domain = m;
m->cf->domain = NULL;
m->cf = cf;
m->name = cf->name;
/* Reconfigure label ranges */
list old_ranges;
init_list(&old_ranges);
add_tail_list(&old_ranges, &m->ranges);
init_list(&m->ranges);
struct mpls_range_config *rc;
WALK_LIST(rc, cf->ranges)
{
struct mpls_range *r = mpls_find_range_(&old_ranges, rc->name);
if (r && mpls_reconfigure_range(m, r, rc))
{
rem_node(&r->n);
add_tail(&m->ranges, &r->n);
continue;
}
mpls_new_range(m, rc);
}
struct mpls_range *r, *r2;
WALK_LIST_DELSAFE(r, r2, old_ranges)
mpls_remove_range(r);
add_tail_list(&m->ranges, &old_ranges);
return 1;
}
static void
mpls_free_domain(struct mpls_domain *m)
{
ASSERT(m->use_count == 0);
ASSERT(m->label_count == 0);
ASSERT(EMPTY_LIST(m->handles));
struct config *cfg = m->removed;
m->cf->domain = NULL;
rem_node(&m->n);
rfree(m->pool);
config_del_obstacle(cfg);
}
static void
mpls_remove_domain(struct mpls_domain *m, struct config *cfg)
{
m->removed = cfg;
config_add_obstacle(cfg);
if (!m->use_count)
mpls_free_domain(m);
}
void
mpls_lock_domain(struct mpls_domain *m)
{
m->use_count++;
}
void
mpls_unlock_domain(struct mpls_domain *m)
{
ASSERT(m->use_count > 0);
m->use_count--;
if (!m->use_count && m->removed)
mpls_free_domain(m);
}
void
mpls_preconfig(struct config *c)
{
init_list(&c->mpls_domains);
}
void
mpls_commit(struct config *new, struct config *old)
{
list old_domains;
init_list(&old_domains);
add_tail_list(&old_domains, &mpls_domains);
init_list(&mpls_domains);
struct mpls_domain_config *mc;
WALK_LIST(mc, new->mpls_domains)
{
struct mpls_domain *m = mpls_find_domain_(&old_domains, mc->name);
if (m && mpls_reconfigure_domain(m, mc))
{
rem_node(&m->n);
add_tail(&mpls_domains, &m->n);
continue;
}
mpls_new_domain(mc);
}
struct mpls_domain *m, *m2;
WALK_LIST_DELSAFE(m, m2, old_domains)
mpls_remove_domain(m, old);
add_tail_list(&mpls_domains, &old_domains);
}
/*
* MPLS range
*/
struct mpls_range_config *
mpls_range_config_new(struct mpls_domain_config *mc, struct symbol *s)
{
struct mpls_range_config *rc = cfg_allocz(sizeof(struct mpls_range_config));
if (s)
cf_define_symbol(new_config, s, SYM_MPLS_RANGE, mpls_range, rc);
rc->domain = mc;
rc->name = s ? s->name : NULL;
rc->start = (uint) -1;
rc->length = (uint) -1;
add_tail(&mc->ranges, &rc->n);
return rc;
}
static struct mpls_range *
mpls_new_range(struct mpls_domain *m, struct mpls_range_config *cf)
{
struct mpls_range *r = mb_allocz(m->pool, sizeof(struct mpls_range));
r->cf = cf;
r->name = cf->name;
r->lo = cf->start;
r->hi = cf->start + cf->length;
add_tail(&m->ranges, &r->n);
cf->range = r;
return r;
}
static struct mpls_range *
mpls_find_range_(list *l, const char *name)
{
struct mpls_range *r;
WALK_LIST(r, *l)
if (!strcmp(r->name, name))
return r;
return NULL;
}
static int
mpls_reconfigure_range(struct mpls_domain *m UNUSED, struct mpls_range *r, struct mpls_range_config *cf)
{
if ((cf->start > r->lo) || (cf->start + cf->length < r->hi))
return 0;
cf->range = r;
r->cf->range = NULL;
r->cf = cf;
r->name = cf->name;
r->lo = cf->start;
r->hi = cf->start + cf->length;
return 1;
}
static void
mpls_free_range(struct mpls_range *r)
{
ASSERT(r->use_count == 0);
ASSERT(r->label_count == 0);
r->cf->range = NULL;
rem_node(&r->n);
mb_free(r);
}
static void
mpls_remove_range(struct mpls_range *r)
{
r->removed = 1;
if (!r->use_count)
mpls_free_range(r);
}
void
mpls_lock_range(struct mpls_range *r)
{
r->use_count++;
}
void
mpls_unlock_range(struct mpls_range *r)
{
ASSERT(r->use_count > 0);
r->use_count--;
if (!r->use_count && r->removed)
mpls_free_range(r);
}
/*
* MPLS handle
*/
struct mpls_handle *
mpls_new_handle(struct mpls_domain *m, struct mpls_range *r)
{
struct mpls_handle *h = mb_allocz(m->pool, sizeof(struct mpls_handle));
h->range = r;
mpls_lock_range(h->range);
add_tail(&m->handles, &h->n);
return h;
}
void
mpls_free_handle(struct mpls_domain *m UNUSED, struct mpls_handle *h)
{
ASSERT(h->label_count == 0);
mpls_unlock_range(h->range);
rem_node(&h->n);
mb_free(h);
}
/*
* MPLS label
*/
uint
mpls_new_label(struct mpls_domain *m, struct mpls_handle *h)
{
struct mpls_range *r = h->range;
uint n = lmap_first_zero_in_range(&m->labels, r->lo, r->hi);
if (n >= r->hi)
return 0;
m->label_count++;
r->label_count++;
h->label_count++;
lmap_set(&m->labels, n);
return n;
}
void
mpls_free_label(struct mpls_domain *m, struct mpls_handle *h, uint n)
{
struct mpls_range *r = h->range;
ASSERT(lmap_test(&m->labels, n));
lmap_clear(&m->labels, n);
ASSERT(m->label_count);
m->label_count--;
ASSERT(r->label_count);
r->label_count--;
ASSERT(h->label_count);
h->label_count--;
}
/*
* MPLS channel
*/
static void
mpls_channel_init(struct channel *C, struct channel_config *CC)
{
struct mpls_channel *c = (void *) C;
struct mpls_channel_config *cc = (void *) CC;
c->domain = cc->domain->domain;
c->range = cc->range->range;
c->label_policy = cc->label_policy;
}
static int
mpls_channel_start(struct channel *C)
{
struct mpls_channel *c = (void *) C;
mpls_lock_domain(c->domain);
mpls_lock_range(c->range);
return 0;
}
/*
static void
mpls_channel_shutdown(struct channel *C)
{
struct mpls_channel *c = (void *) C;
}
*/
static void
mpls_channel_cleanup(struct channel *C)
{
struct mpls_channel *c = (void *) C;
mpls_unlock_range(c->range);
mpls_unlock_domain(c->domain);
}
static int
mpls_channel_reconfigure(struct channel *C, struct channel_config *CC, int *import_changed UNUSED, int *export_changed UNUSED)
{
struct mpls_channel *c = (void *) C;
struct mpls_channel_config *new = (void *) CC;
if ((new->domain->domain != c->domain) ||
(new->range->range != c->range) ||
(new->label_policy != c->label_policy))
return 0;
return 1;
}
void
mpls_channel_postconfig(struct channel_config *CC)
{
struct mpls_channel_config *cc = (void *) CC;
if (!cc->domain)
cf_error("MPLS domain not specified");
if (!cc->range)
cc->range = (cc->label_policy == MPLS_POLICY_STATIC) ?
cc->domain->static_range : cc->domain->dynamic_range;
if (cc->range->domain != cc->domain)
cf_error("MPLS label range from different MPLS domain");
if (!cc->c.table)
cf_error("Routing table not specified");
}
struct channel_class channel_mpls = {
.channel_size = sizeof(struct mpls_channel),
.config_size = sizeof(struct mpls_channel_config),
.init = mpls_channel_init,
.start = mpls_channel_start,
// .shutdown = mpls_channel_shutdown,
.cleanup = mpls_channel_cleanup,
.reconfigure = mpls_channel_reconfigure,
};
/*
* MPLS FEC map
*/
#define NET_KEY(fec) fec->net, fec->path_id, fec->hash
#define NET_NEXT(fec) fec->next_k
#define NET_EQ(n1,i1,h1,n2,i2,h2) h1 == h2 && i1 == i2 && net_equal(n1, n2)
#define NET_FN(n,i,h) h
#define NET_REHASH mpls_net_rehash
#define NET_PARAMS /8, *2, 2, 2, 8, 24
#define RTA_KEY(fec) fec->rta, fec->class_id, fec->hash
#define RTA_NEXT(fec) fec->next_k
#define RTA_EQ(r1,i1,h1,r2,i2,h2) h1 == h2 && r1 == r2 && i1 == i2
#define RTA_FN(r,i,h) h
#define RTA_REHASH mpls_rta_rehash
#define RTA_PARAMS /8, *2, 2, 2, 8, 24
#define LABEL_KEY(fec) fec->label
#define LABEL_NEXT(fec) fec->next_l
#define LABEL_EQ(l1,l2) l1 == l2
#define LABEL_FN(l) u32_hash(l)
#define LABEL_REHASH mpls_label_rehash
#define LABEL_PARAMS /8, *2, 2, 2, 8, 24
HASH_DEFINE_REHASH_FN(NET, struct mpls_fec)
HASH_DEFINE_REHASH_FN(RTA, struct mpls_fec)
HASH_DEFINE_REHASH_FN(LABEL, struct mpls_fec)
static void mpls_withdraw_fec(struct mpls_fec_map *m, struct mpls_fec *fec);
static rta * mpls_get_key_rta(struct mpls_fec_map *m, const rta *src);
struct mpls_fec_map *
mpls_fec_map_new(pool *pp, struct channel *C, uint rts)
{
struct pool *p = rp_new(pp, "MPLS FEC map");
struct mpls_fec_map *m = mb_allocz(p, sizeof(struct mpls_fec_map));
struct mpls_channel *c = (void *) C;
m->pool = p;
m->channel = C;
m->domain = c->domain;
mpls_lock_domain(m->domain);
m->handle = mpls_new_handle(c->domain, c->range);
/* net_hash and rta_hash are initialized on-demand */
HASH_INIT(m->label_hash, m->pool, 4);
m->mpls_rts = rts;
m->mpls_scope = SCOPE_UNIVERSE;
return m;
}
void
mpls_fec_map_free(struct mpls_fec_map *m)
{
/* Free stored rtas */
if (m->rta_hash.data)
{
HASH_WALK(m->rta_hash, next_k, fec)
{
rta_free(fec->rta);
fec->rta = NULL;
}
HASH_WALK_END;
}
/* Free allocated labels */
HASH_WALK(m->label_hash, next_l, fec)
{
if (fec->policy != MPLS_POLICY_STATIC)
mpls_free_label(m->domain, m->handle, fec->label);
}
HASH_WALK_END;
mpls_free_handle(m->domain, m->handle);
mpls_unlock_domain(m->domain);
rfree(m->pool);
}
static slab *
mpls_slab(struct mpls_fec_map *m, uint type)
{
ASSERT(type <= NET_VPN6);
int pos = type ? (type - 1) : 0;
if (!m->slabs[pos])
m->slabs[pos] = sl_new(m->pool, sizeof(struct mpls_fec) + net_addr_length[pos + 1]);
return m->slabs[pos];
}
struct mpls_fec *
mpls_find_fec_by_label(struct mpls_fec_map *m, u32 label)
{
return HASH_FIND(m->label_hash, LABEL, label);
}
struct mpls_fec *
mpls_get_fec_by_label(struct mpls_fec_map *m, u32 label)
{
struct mpls_fec *fec = HASH_FIND(m->label_hash, LABEL, label);
if (fec)
return fec;
fec = sl_allocz(mpls_slab(m, 0));
fec->label = label;
fec->policy = MPLS_POLICY_STATIC;
DBG("New FEC lab %u\n", fec->label);
HASH_INSERT2(m->label_hash, LABEL, m->pool, fec);
return fec;
}
struct mpls_fec *
mpls_get_fec_by_net(struct mpls_fec_map *m, const net_addr *net, u32 path_id)
{
if (!m->net_hash.data)
HASH_INIT(m->net_hash, m->pool, 4);
u32 hash = net_hash(net) ^ u32_hash(path_id);
struct mpls_fec *fec = HASH_FIND(m->net_hash, NET, net, path_id, hash);
if (fec)
return fec;
fec = sl_allocz(mpls_slab(m, net->type));
fec->hash = hash;
fec->path_id = path_id;
net_copy(fec->net, net);
fec->label = mpls_new_label(m->domain, m->handle);
fec->policy = MPLS_POLICY_PREFIX;
DBG("New FEC net %u\n", fec->label);
HASH_INSERT2(m->net_hash, NET, m->pool, fec);
HASH_INSERT2(m->label_hash, LABEL, m->pool, fec);
return fec;
}
struct mpls_fec *
mpls_get_fec_by_rta(struct mpls_fec_map *m, const rta *src, u32 class_id)
{
if (!m->rta_hash.data)
HASH_INIT(m->rta_hash, m->pool, 4);
rta *rta = mpls_get_key_rta(m, src);
u32 hash = rta->hash_key ^ u32_hash(class_id);
struct mpls_fec *fec = HASH_FIND(m->rta_hash, RTA, rta, class_id, hash);
if (fec)
{
rta_free(rta);
return fec;
}
fec = sl_allocz(mpls_slab(m, 0));
fec->hash = hash;
fec->class_id = class_id;
fec->rta = rta;
fec->label = mpls_new_label(m->domain, m->handle);
fec->policy = MPLS_POLICY_AGGREGATE;
DBG("New FEC rta %u\n", fec->label);
HASH_INSERT2(m->rta_hash, RTA, m->pool, fec);
HASH_INSERT2(m->label_hash, LABEL, m->pool, fec);
return fec;
}
void
mpls_free_fec(struct mpls_fec_map *m, struct mpls_fec *fec)
{
if (fec->state != MPLS_FEC_DOWN)
mpls_withdraw_fec(m, fec);
DBG("Free FEC %u\n", fec->label);
mpls_free_label(m->domain, m->handle, fec->label);
HASH_REMOVE2(m->label_hash, LABEL, m->pool, fec);
switch (fec->policy)
{
case MPLS_POLICY_STATIC:
break;
case MPLS_POLICY_PREFIX:
HASH_REMOVE2(m->net_hash, NET, m->pool, fec);
break;
case MPLS_POLICY_AGGREGATE:
rta_free(fec->rta);
HASH_REMOVE2(m->rta_hash, RTA, m->pool, fec);
break;
default:
bug("Unknown fec type");
}
sl_free(fec);
}
static inline void mpls_lock_fec(struct mpls_fec_map *x UNUSED, struct mpls_fec *fec)
{ if (fec) fec->uc++; }
static inline void mpls_unlock_fec(struct mpls_fec_map *x, struct mpls_fec *fec)
{ if (fec && !--fec->uc) mpls_free_fec(x, fec); }
static inline void
mpls_damage_fec(struct mpls_fec_map *m UNUSED, struct mpls_fec *fec)
{
if (fec->state == MPLS_FEC_CLEAN)
fec->state = MPLS_FEC_DIRTY;
}
static rta *
mpls_get_key_rta(struct mpls_fec_map *m, const rta *src)
{
rta *a = allocz(RTA_MAX_SIZE);
a->source = m->mpls_rts;
a->scope = m->mpls_scope;
if (!src->hostentry)
{
/* Just copy the nexthop */
a->dest = src->dest;
nexthop_link(a, &src->nh);
}
else
{
/* Keep the hostentry */
a->hostentry = src->hostentry;
/* Keep the original labelstack */
const u32 *labels = &src->nh.label[src->nh.labels - src->nh.labels_orig];
a->nh.labels = a->nh.labels_orig = src->nh.labels_orig;
memcpy(a->nh.label, labels, src->nh.labels_orig * sizeof(u32));
}
return rta_lookup(a);
}
static void
mpls_announce_fec(struct mpls_fec_map *m, struct mpls_fec *fec, const rta *src)
{
rta *a = allocz(RTA_MAX_SIZE);
a->source = m->mpls_rts;
a->scope = m->mpls_scope;
if (!src->hostentry)
{
/* Just copy the nexthop */
a->dest = src->dest;
nexthop_link(a, &src->nh);
}
else
{
const u32 *labels = &src->nh.label[src->nh.labels - src->nh.labels_orig];
mpls_label_stack ms;
/* Apply the hostentry with the original labelstack */
ms.len = src->nh.labels_orig;
memcpy(ms.stack, labels, src->nh.labels_orig * sizeof(u32));
rta_apply_hostentry(a, src->hostentry, &ms);
}
net_addr_mpls n = NET_ADDR_MPLS(fec->label);
rte *e = rte_get_temp(rta_lookup(a), m->channel->proto->main_source);
e->pflags = 0;
fec->state = MPLS_FEC_CLEAN;
rte_update2(m->channel, (net_addr *) &n, e, m->channel->proto->main_source);
}
static void
mpls_withdraw_fec(struct mpls_fec_map *m, struct mpls_fec *fec)
{
net_addr_mpls n = NET_ADDR_MPLS(fec->label);
fec->state = MPLS_FEC_DOWN;
rte_update2(m->channel, (net_addr *) &n, NULL, m->channel->proto->main_source);
}
static void
mpls_apply_fec(rte *r, struct mpls_fec *fec, linpool *lp)
{
struct ea_list *ea = lp_allocz(lp, sizeof(struct ea_list) + 2 * sizeof(eattr));
rta *old_attrs = r->attrs;
if (rta_is_cached(old_attrs))
r->attrs = rta_do_cow(r->attrs, lp);
*ea = (struct ea_list) {
.next = r->attrs->eattrs,
.flags = EALF_SORTED,
.count = 2,
};
ea->attrs[0] = (struct eattr) {
.id = EA_MPLS_LABEL,
.type = EAF_TYPE_INT,
.u.data = fec->label,
};
ea->attrs[1] = (struct eattr) {
.id = EA_MPLS_POLICY,
.type = EAF_TYPE_INT,
.u.data = fec->policy,
};
r->attrs->eattrs = ea;
if (rta_is_cached(old_attrs))
{
r->attrs = rta_lookup(r->attrs);
rta_free(old_attrs);
}
}
void
mpls_handle_rte(struct mpls_fec_map *m, const net_addr *n, rte *r, linpool *lp, struct mpls_fec **locked_fec)
{
ASSERT(!(r->flags & REF_COW));
struct mpls_fec *fec = NULL;
/* Select FEC for route */
uint policy = ea_get_int(r->attrs->eattrs, EA_MPLS_POLICY, 0);
switch (policy)
{
case MPLS_POLICY_NONE:
return;
case MPLS_POLICY_STATIC:;
uint label = ea_get_int(r->attrs->eattrs, EA_MPLS_LABEL, 0);
if (label < 16)
return;
fec = mpls_get_fec_by_label(m, label);
mpls_damage_fec(m, fec);
break;
case MPLS_POLICY_PREFIX:
fec = mpls_get_fec_by_net(m, n, r->src->private_id);
mpls_damage_fec(m, fec);
break;
case MPLS_POLICY_AGGREGATE:;
uint class = ea_get_int(r->attrs->eattrs, EA_MPLS_CLASS, 0);
fec = mpls_get_fec_by_rta(m, r->attrs, class);
break;
default:
log(L_WARN "Route %N has invalid MPLS policy %u", n, policy);
return;
}
/* Temporarily lock FEC */
mpls_lock_fec(m, fec);
*locked_fec = fec;
/* Apply FEC label to route */
mpls_apply_fec(r, fec, lp);
/* Announce MPLS rule for new/updated FEC */
if (fec->state != MPLS_FEC_CLEAN)
mpls_announce_fec(m, fec, r->attrs);
}
void
mpls_handle_rte_cleanup(struct mpls_fec_map *m, struct mpls_fec **locked_fec)
{
/* Unlock temporarily locked FEC from mpls_handle_rte() */
if (*locked_fec)
{
mpls_unlock_fec(m, *locked_fec);
*locked_fec = NULL;
}
}
void
mpls_rte_insert(net *n UNUSED, rte *r)
{
struct proto *p = r->src->proto;
struct mpls_fec_map *m = p->mpls_map;
uint label = ea_get_int(r->attrs->eattrs, EA_MPLS_LABEL, 0);
if (label < 16)
return;
struct mpls_fec *fec = mpls_find_fec_by_label(m, label);
if (!fec)
return;
mpls_lock_fec(m, fec);
}
void
mpls_rte_remove(net *n UNUSED, rte *r)
{
struct proto *p = r->src->proto;
struct mpls_fec_map *m = p->mpls_map;
uint label = ea_get_int(r->attrs->eattrs, EA_MPLS_LABEL, 0);
if (label < 16)
return;
struct mpls_fec *fec = mpls_find_fec_by_label(m, label);
if (!fec)
return;
mpls_unlock_fec(m, fec);
}

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/*
* BIRD Internet Routing Daemon -- MPLS Structures
*
* (c) 2022 Ondrej Zajicek <santiago@crfreenet.org>
* (c) 2022 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_MPLS_H_
#define _BIRD_MPLS_H_
#include "nest/bird.h"
#include "lib/bitmap.h"
#include "lib/hash.h"
#include "nest/route.h"
#include "nest/protocol.h"
#define MPLS_POLICY_NONE 0
#define MPLS_POLICY_STATIC 1
#define MPLS_POLICY_PREFIX 2
#define MPLS_POLICY_AGGREGATE 3
#define MPLS_FEC_DOWN 0
#define MPLS_FEC_CLEAN 1
#define MPLS_FEC_DIRTY 2
struct mpls_domain_config {
node n; /* Node in config.mpls_domains */
struct mpls_domain *domain; /* Our instance */
const char *name;
list ranges; /* List of label ranges (struct mpls_range_config) */
struct mpls_range_config *static_range; /* Default static label range */
struct mpls_range_config *dynamic_range; /* Default dynamic label range */
};
struct mpls_domain {
node n; /* Node in global list of MPLS domains (mpls_domains) */
struct mpls_domain_config *cf; /* Our config */
const char *name;
pool *pool; /* Pool for the domain and associated objects */
struct lmap labels; /* Bitmap of allocated labels */
uint label_count; /* Number of allocated labels */
uint use_count; /* Reference counter */
struct config *removed; /* Deconfigured, waiting for zero use_count,
while keeping config obstacle */
list ranges; /* List of label ranges (struct mpls_range) */
list handles; /* List of label handles (struct mpls_handle) */
};
struct mpls_range_config {
node n; /* Node in mpls_domain_config.ranges */
struct mpls_range *range; /* Our instance */
struct mpls_domain_config *domain; /* Parent MPLS domain */
const char *name;
uint start; /* Label range start, (uint) -1 for undefined */
uint length; /* Label range length, (uint) -1 for undefined */
};
struct mpls_range {
node n; /* Node in mpls_domain.ranges */
struct mpls_range_config *cf; /* Our config */
const char *name;
uint lo, hi; /* Label range interval */
uint label_count; /* Number of allocated labels */
uint use_count; /* Reference counter */
u8 removed; /* Deconfigured, waiting for zero use_count */
};
struct mpls_handle {
node n; /* Node in mpls_domain.handles */
struct mpls_range *range; /* Associated range, keeping reference */
uint label_count; /* Number of allocated labels */
};
void mpls_init(void);
struct mpls_domain_config * mpls_domain_config_new(struct symbol *s);
void mpls_domain_postconfig(struct mpls_domain_config *cf);
struct mpls_range_config * mpls_range_config_new(struct mpls_domain_config *m, struct symbol *s);
void mpls_preconfig(struct config *c);
void mpls_commit(struct config *new, struct config *old);
uint mpls_new_label(struct mpls_domain *m, struct mpls_handle *h);
void mpls_free_label(struct mpls_domain *m, struct mpls_handle *h, uint n);
static inline struct mpls_domain_config *cf_default_mpls_domain(struct config *cfg)
{ return EMPTY_LIST(cfg->mpls_domains) ? NULL : HEAD(cfg->mpls_domains); }
struct mpls_channel_config {
struct channel_config c;
struct mpls_domain_config *domain;
struct mpls_range_config *range;
uint label_policy;
};
struct mpls_channel {
struct channel c;
struct mpls_domain *domain;
struct mpls_range *range;
uint label_policy;
};
void mpls_channel_postconfig(struct channel_config *CF);
extern struct channel_class channel_mpls;
struct mpls_fec {
u32 label; /* Label for FEC */
u32 hash; /* Hash for primary key (net / rta) */
u32 uc; /* Number of LSPs for FEC */
union { /* Extension part of key */
u32 path_id; /* Source path_id */
u32 class_id; /* Aaggregation class */
};
u8 state; /* FEC state (MPLS_FEC_*) */
u8 policy; /* Label policy (MPLS_POLICY_*) */
struct mpls_fec *next_k; /* Next in mpls_fec.net_hash/rta_hash */
struct mpls_fec *next_l; /* Next in mpls_fec.label_hash */
union { /* Primary key */
struct rta *rta;
net_addr net[0];
};
};
struct mpls_fec_map {
pool *pool; /* Pool for FEC map */
slab *slabs[4]; /* Slabs for FEC allocation */
HASH(struct mpls_fec) net_hash; /* Hash table for MPLS_POLICY_PREFIX FECs */
HASH(struct mpls_fec) rta_hash; /* Hash table for MPLS_POLICY_AGGREGATE FECs */
HASH(struct mpls_fec) label_hash; /* Hash table for FEC lookup by label */
struct channel *channel; /* MPLS channel for FEC announcement */
struct mpls_domain *domain; /* MPLS domain, keeping reference */
struct mpls_handle *handle; /* Handle for allocation of labels */
u8 mpls_rts; /* Source value used for MPLS routes (RTS_*) */
u8 mpls_scope; /* Scope value used for MPLS routes () */
};
struct mpls_fec_map *mpls_fec_map_new(pool *p, struct channel *c, uint rts);
void mpls_fec_map_free(struct mpls_fec_map *m);
struct mpls_fec *mpls_find_fec_by_label(struct mpls_fec_map *x, u32 label);
struct mpls_fec *mpls_get_fec_by_label(struct mpls_fec_map *m, u32 label);
struct mpls_fec *mpls_get_fec_by_net(struct mpls_fec_map *m, const net_addr *net, u32 path_id);
struct mpls_fec *mpls_get_fec_by_rta(struct mpls_fec_map *m, const rta *src, u32 class_id);
void mpls_free_fec(struct mpls_fec_map *x, struct mpls_fec *fec);
void mpls_handle_rte(struct mpls_fec_map *m, const net_addr *n, rte *r, linpool *lp, struct mpls_fec **locked_fec);
void mpls_handle_rte_cleanup(struct mpls_fec_map *m, struct mpls_fec **locked_fec);
void mpls_rte_insert(net *n UNUSED, rte *r);
void mpls_rte_remove(net *n UNUSED, rte *r);
#endif

78
nest/proto.c
View File

@ -18,6 +18,7 @@
#include "conf/conf.h" #include "conf/conf.h"
#include "nest/route.h" #include "nest/route.h"
#include "nest/iface.h" #include "nest/iface.h"
#include "nest/mpls.h"
#include "nest/cli.h" #include "nest/cli.h"
#include "filter/filter.h" #include "filter/filter.h"
#include "filter/f-inst.h" #include "filter/f-inst.h"
@ -764,7 +765,7 @@ channel_config_new(const struct channel_class *cc, const char *name, uint net_ty
if (!net_val_match(net_type, proto->protocol->channel_mask)) if (!net_val_match(net_type, proto->protocol->channel_mask))
cf_error("Unsupported channel type"); cf_error("Unsupported channel type");
if (proto->net_type && (net_type != proto->net_type)) if (proto->net_type && (net_type != proto->net_type) && (net_type != NET_MPLS))
cf_error("Different channel type"); cf_error("Different channel type");
tab = new_config->def_tables[net_type]; tab = new_config->def_tables[net_type];
@ -955,6 +956,81 @@ proto_configure_channel(struct proto *p, struct channel **pc, struct channel_con
return 1; return 1;
} }
/**
* proto_setup_mpls_map - automatically setup FEC map for protocol
* @p: affected protocol
* @rts: RTS_* value for generated MPLS routes
* @hooks: whether to update rte_insert / rte_remove hooks
*
* Add, remove or reconfigure MPLS FEC map of the protocol @p, depends on
* whether MPLS channel exists, and setup rte_insert / rte_remove hooks with
* default MPLS handlers. It is a convenience function supposed to be called
* from the protocol start and configure hooks, after reconfiguration of
* channels. For shutdown, use proto_shutdown_mpls_map(). If caller uses its own
* rte_insert / rte_remove hooks, it is possible to disable updating hooks and
* doing that manually.
*/
void
proto_setup_mpls_map(struct proto *p, uint rts, int hooks)
{
struct mpls_fec_map *m = p->mpls_map;
struct channel *c = p->mpls_channel;
if (!m && c)
{
/*
* Note that when called from a protocol start hook, it is called before
* mpls_channel_start(). But FEC map locks MPLS domain internally so it does
* not depend on lock from MPLS channel.
*/
p->mpls_map = mpls_fec_map_new(p->pool, c, rts);
}
else if (m && !c)
{
/*
* Note that for reconfiguration, it is called after the MPLS channel has
* been already removed. But removal of active MPLS channel would trigger
* protocol restart anyways.
*/
mpls_fec_map_free(m);
p->mpls_map = NULL;
}
else if (m && c)
{
// mpls_fec_map_reconfigure(m, c);
}
if (hooks)
{
p->rte_insert = p->mpls_map ? mpls_rte_insert : NULL;
p->rte_remove = p->mpls_map ? mpls_rte_remove : NULL;
}
}
/**
* proto_shutdown_mpls_map - automatically shutdown FEC map for protocol
* @p: affected protocol
* @hooks: whether to update rte_insert / rte_remove hooks
*
* Remove MPLS FEC map of the protocol @p during protocol shutdown.
*/
void
proto_shutdown_mpls_map(struct proto *p, int hooks)
{
struct mpls_fec_map *m = p->mpls_map;
if (!m)
return;
mpls_fec_map_free(m);
p->mpls_map = NULL;
if (hooks)
{
p->rte_insert = NULL;
p->rte_remove = NULL;
}
}
static void static void
proto_event(void *ptr) proto_event(void *ptr)

7
nest/protocol.h
View File

@ -31,6 +31,7 @@ struct channel;
struct ea_list; struct ea_list;
struct eattr; struct eattr;
struct symbol; struct symbol;
struct mpls_fec_map;
/* /*
@ -172,6 +173,8 @@ struct proto {
struct channel *main_channel; /* Primary channel */ struct channel *main_channel; /* Primary channel */
struct rte_src *main_source; /* Primary route source */ struct rte_src *main_source; /* Primary route source */
struct iface *vrf; /* Related VRF instance, NULL if global */ struct iface *vrf; /* Related VRF instance, NULL if global */
struct channel *mpls_channel; /* MPLS channel, when used */
struct mpls_fec_map *mpls_map; /* Maps protocol routes to FECs / labels */
const char *name; /* Name of this instance (== cf->name) */ const char *name; /* Name of this instance (== cf->name) */
u32 debug; /* Debugging flags */ u32 debug; /* Debugging flags */
@ -619,12 +622,16 @@ struct channel {
struct channel_config *proto_cf_find_channel(struct proto_config *p, uint net_type); struct channel_config *proto_cf_find_channel(struct proto_config *p, uint net_type);
static inline struct channel_config *proto_cf_main_channel(struct proto_config *pc) static inline struct channel_config *proto_cf_main_channel(struct proto_config *pc)
{ return proto_cf_find_channel(pc, pc->net_type); } { return proto_cf_find_channel(pc, pc->net_type); }
static inline struct channel_config *proto_cf_mpls_channel(struct proto_config *pc)
{ return proto_cf_find_channel(pc, NET_MPLS); }
struct channel *proto_find_channel_by_table(struct proto *p, struct rtable *t); struct channel *proto_find_channel_by_table(struct proto *p, struct rtable *t);
struct channel *proto_find_channel_by_name(struct proto *p, const char *n); struct channel *proto_find_channel_by_name(struct proto *p, const char *n);
struct channel *proto_add_channel(struct proto *p, struct channel_config *cf); struct channel *proto_add_channel(struct proto *p, struct channel_config *cf);
void proto_remove_channel(struct proto *p, struct channel *c); void proto_remove_channel(struct proto *p, struct channel *c);
int proto_configure_channel(struct proto *p, struct channel **c, struct channel_config *cf); int proto_configure_channel(struct proto *p, struct channel **c, struct channel_config *cf);
void proto_setup_mpls_map(struct proto *p, uint rts, int hooks);
void proto_shutdown_mpls_map(struct proto *p, int hooks);
void channel_set_state(struct channel *c, uint state); void channel_set_state(struct channel *c, uint state);
void channel_setup_in_table(struct channel *c); void channel_setup_in_table(struct channel *c);

8
nest/route.h
View File

@ -200,6 +200,7 @@ typedef struct rtable {
struct timer *settle_timer; /* Settle time for notifications */ struct timer *settle_timer; /* Settle time for notifications */
list flowspec_links; /* List of flowspec links, src for NET_IPx and dst for NET_FLOWx */ list flowspec_links; /* List of flowspec links, src for NET_IPx and dst for NET_FLOWx */
struct f_trie *flowspec_trie; /* Trie for evaluation of flowspec notifications */ struct f_trie *flowspec_trie; /* Trie for evaluation of flowspec notifications */
// struct mpls_domain *mpls_domain; /* Label allocator for MPLS */
} rtable; } rtable;
struct rt_subscription { struct rt_subscription {
@ -529,7 +530,10 @@ typedef struct eattr {
const char *ea_custom_name(uint ea); const char *ea_custom_name(uint ea);
#define EA_GEN_IGP_METRIC EA_CODE(PROTOCOL_NONE, 0) #define EA_GEN_IGP_METRIC EA_CODE(PROTOCOL_NONE, 0)
#define EA_MPLS_LABEL EA_CODE(PROTOCOL_NONE, 1)
#define EA_MPLS_POLICY EA_CODE(PROTOCOL_NONE, 2)
#define EA_MPLS_CLASS EA_CODE(PROTOCOL_NONE, 3)
#define EA_CODE_MASK 0xffff #define EA_CODE_MASK 0xffff
#define EA_CUSTOM_BIT 0x8000 #define EA_CUSTOM_BIT 0x8000
@ -689,7 +693,7 @@ static inline int nexthop_same(struct nexthop *x, struct nexthop *y)
{ return (x == y) || nexthop__same(x, y); } { return (x == y) || nexthop__same(x, y); }
struct nexthop *nexthop_merge(struct nexthop *x, struct nexthop *y, int rx, int ry, int max, linpool *lp); struct nexthop *nexthop_merge(struct nexthop *x, struct nexthop *y, int rx, int ry, int max, linpool *lp);
struct nexthop *nexthop_sort(struct nexthop *x); struct nexthop *nexthop_sort(struct nexthop *x);
static inline void nexthop_link(struct rta *a, struct nexthop *from) static inline void nexthop_link(struct rta *a, const struct nexthop *from)
{ memcpy(&a->nh, from, nexthop_size(from)); } { memcpy(&a->nh, from, nexthop_size(from)); }
void nexthop_insert(struct nexthop **n, struct nexthop *y); void nexthop_insert(struct nexthop **n, struct nexthop *y);
int nexthop_is_sorted(struct nexthop *x); int nexthop_is_sorted(struct nexthop *x);

26
nest/rt-attr.c
View File

@ -803,13 +803,27 @@ ea_free(ea_list *o)
static int static int
get_generic_attr(const eattr *a, byte **buf, int buflen UNUSED) get_generic_attr(const eattr *a, byte **buf, int buflen UNUSED)
{ {
if (a->id == EA_GEN_IGP_METRIC) switch (a->id)
{ {
*buf += bsprintf(*buf, "igp_metric"); case EA_GEN_IGP_METRIC:
return GA_NAME; *buf += bsprintf(*buf, "igp_metric");
} return GA_NAME;
return GA_UNKNOWN; case EA_MPLS_LABEL:
*buf += bsprintf(*buf, "mpls_label");
return GA_NAME;
case EA_MPLS_POLICY:
*buf += bsprintf(*buf, "mpls_policy");
return GA_NAME;
case EA_MPLS_CLASS:
*buf += bsprintf(*buf, "mpls_class");
return GA_NAME;
default:
return GA_UNKNOWN;
}
} }
void void

15
nest/rt-show.c
View File

@ -103,7 +103,7 @@ static void
rt_show_net(struct cli *c, net *n, struct rt_show_data *d) rt_show_net(struct cli *c, net *n, struct rt_show_data *d)
{ {
rte *e, *ee; rte *e, *ee;
byte ia[NET_MAX_TEXT_LENGTH+1]; byte ia[NET_MAX_TEXT_LENGTH+16+1];
struct channel *ec = d->tab->export_channel; struct channel *ec = d->tab->export_channel;
/* The Clang static analyzer complains that ec may be NULL. /* The Clang static analyzer complains that ec may be NULL.
@ -112,6 +112,7 @@ rt_show_net(struct cli *c, net *n, struct rt_show_data *d)
int first = 1; int first = 1;
int first_show = 1; int first_show = 1;
int last_label = 0;
int pass = 0; int pass = 0;
for (e = n->routes; e; e = e->next) for (e = n->routes; e; e = e->next)
@ -187,13 +188,21 @@ rt_show_net(struct cli *c, net *n, struct rt_show_data *d)
if (d->stats < 2) if (d->stats < 2)
{ {
if (first_show) int label = (int) ea_get_int(e->attrs->eattrs, EA_MPLS_LABEL, (uint) -1);
net_format(n->n.addr, ia, sizeof(ia));
if (first_show || (last_label != label))
{
if (label < 0)
net_format(n->n.addr, ia, sizeof(ia));
else
bsnprintf(ia, sizeof(ia), "%N mpls %d", n->n.addr, label);
}
else else
ia[0] = 0; ia[0] = 0;
rt_show_rte(c, ia, e, d, (e->net->routes == ee)); rt_show_rte(c, ia, e, d, (e->net->routes == ee));
first_show = 0; first_show = 0;
last_label = label;
} }
d->show_counter++; d->show_counter++;

11
nest/rt-table.c
View File

@ -98,6 +98,7 @@
#include "nest/route.h" #include "nest/route.h"
#include "nest/protocol.h" #include "nest/protocol.h"
#include "nest/iface.h" #include "nest/iface.h"
#include "nest/mpls.h"
#include "lib/resource.h" #include "lib/resource.h"
#include "lib/event.h" #include "lib/event.h"
#include "lib/timer.h" #include "lib/timer.h"
@ -1562,9 +1563,10 @@ rte_update_unlock(void)
void void
rte_update2(struct channel *c, const net_addr *n, rte *new, struct rte_src *src) rte_update2(struct channel *c, const net_addr *n, rte *new, struct rte_src *src)
{ {
// struct proto *p = c->proto; struct proto *p = c->proto;
struct proto_stats *stats = &c->stats; struct proto_stats *stats = &c->stats;
const struct filter *filter = c->in_filter; const struct filter *filter = c->in_filter;
struct mpls_fec *fec = NULL;
net *nn; net *nn;
ASSERT(c->channel_state == CS_UP); ASSERT(c->channel_state == CS_UP);
@ -1613,6 +1615,10 @@ rte_update2(struct channel *c, const net_addr *n, rte *new, struct rte_src *src)
new->flags |= REF_FILTERED; new->flags |= REF_FILTERED;
} }
} }
if (p->mpls_map)
mpls_handle_rte(p->mpls_map, n, new, rte_update_pool, &fec);
if (!rta_is_cached(new->attrs)) /* Need to copy attributes */ if (!rta_is_cached(new->attrs)) /* Need to copy attributes */
new->attrs = rta_lookup(new->attrs); new->attrs = rta_lookup(new->attrs);
new->flags |= REF_COW; new->flags |= REF_COW;
@ -1637,6 +1643,9 @@ rte_update2(struct channel *c, const net_addr *n, rte *new, struct rte_src *src)
/* And recalculate the best route */ /* And recalculate the best route */
rte_recalculate(c, nn, new, src); rte_recalculate(c, nn, new, src);
if (p->mpls_map)
mpls_handle_rte_cleanup(p->mpls_map, &fec);
rte_update_unlock(); rte_update_unlock();
return; return;

9
sysdep/unix/krt.Y
View File

@ -33,6 +33,7 @@ CF_KEYWORDS(KERNEL, PERSIST, SCAN, TIME, LEARN, DEVICE, ROUTES, GRACEFUL, RESTAR
CF_KEYWORDS(INTERFACE, PREFERRED) CF_KEYWORDS(INTERFACE, PREFERRED)
%type <i> kern_mp_limit %type <i> kern_mp_limit
%type <cc> kern_channel
CF_GRAMMAR CF_GRAMMAR
@ -53,9 +54,15 @@ kern_mp_limit:
| LIMIT expr { $$ = $2; if (($2 <= 0) || ($2 > 255)) cf_error("Merge paths limit must be in range 1-255"); } | LIMIT expr { $$ = $2; if (($2 <= 0) || ($2 > 255)) cf_error("Merge paths limit must be in range 1-255"); }
; ;
kern_channel:
proto_channel
| mpls_channel
;
kern_item: kern_item:
proto_item proto_item
| proto_channel { this_proto->net_type = $1->net_type; } | kern_channel { this_proto->net_type = $1->net_type; }
| PERSIST bool { THIS_KRT->persist = $2; } | PERSIST bool { THIS_KRT->persist = $2; }
| SCAN TIME expr { | SCAN TIME expr {
/* Scan time of 0 means scan on startup only */ /* Scan time of 0 means scan on startup only */

2
sysdep/unix/main.c
View File

@ -33,6 +33,7 @@
#include "nest/route.h" #include "nest/route.h"
#include "nest/protocol.h" #include "nest/protocol.h"
#include "nest/iface.h" #include "nest/iface.h"
#include "nest/mpls.h"
#include "nest/cli.h" #include "nest/cli.h"
#include "nest/locks.h" #include "nest/locks.h"
#include "conf/conf.h" #include "conf/conf.h"
@ -895,6 +896,7 @@ main(int argc, char **argv)
io_init(); io_init();
rt_init(); rt_init();
if_init(); if_init();
mpls_init();
// roa_init(); // roa_init();
config_init(); config_init();

2
test/bt-utils.c
View File

@ -16,6 +16,7 @@
#include "nest/bird.h" #include "nest/bird.h"
#include "nest/route.h" #include "nest/route.h"
#include "nest/protocol.h" #include "nest/protocol.h"
#include "nest/mpls.h"
#include "sysdep/unix/unix.h" #include "sysdep/unix/unix.h"
#include "sysdep/unix/krt.h" #include "sysdep/unix/krt.h"
@ -65,6 +66,7 @@ bt_bird_init(void)
io_init(); io_init();
rt_init(); rt_init();
if_init(); if_init();
mpls_init();
config_init(); config_init();
protos_build(); protos_build();