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Initial BFD commit, work in progress.

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This commit is contained in:
Ondrej Zajicek 2013-09-10 12:09:36 +02:00
parent bff9ce5130
commit bf139664aa
16 changed files with 1913 additions and 10 deletions
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35
lib/buffer.h Normal file
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@ -0,0 +1,35 @@
#define BUFFER(type) struct { type *data; uint used, size; }
#define BUFFER_SIZE(v) ((v).size * sizeof(* (v).data))
#define BUFFER_INIT(v,pool,isize) \
({ \
(v).used = 0; \
(v).size = (isize); \
(v).data = mb_alloc(pool, BUFFER_SIZE(v)); \
})
#define BUFFER_SET(v,nsize) \
({ \
(v).used = (nsize); \
if ((v).used > (v).size) \
buffer_realloc((void **) &((v).data), &((v).size), (v).used, sizeof(* (v).data)); \
})
#define BUFFER_INC(v,step) \
({ \
uint _o = (v).used; \
BUFFER_SET(v, (v).used + (step)); \
(v).data + _o; \
})
#define BUFFER_DEC(v,step) ({ (v).used -= (step); })
#define BUFFER_PUSH(v) (*BUFFER_INC(v,1))
#define BUFFER_POP(v) BUFFER_DEC(v,1)
#define BUFFER_FLUSH(v) ({ (v).used = 0; })

83
lib/hash.h Normal file
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@ -0,0 +1,83 @@
#define HASH(type) struct { type **data; uint used, size; }
#define HASH_TYPE(v) typeof(** (v).data)
#define HASH_SIZE(v) ((v).size * sizeof(* (v).data))
#define HASH_INIT(v,pool,isize) \
({ \
(v).used = 0; \
(v).size = (isize); \
(v).data = mb_allocz(pool, HASH_SIZE(v)); \
})
#define HASH_FIND(v,id,key) \
({ \
HASH_TYPE(v) *_n = (v).data[id##_FN(key, (v).size)]; \
while (_n && !id##_EQ(_n, key)) \
_n = _n->id##_NEXT; \
_n; \
})
#define HASH_INSERT(v,id,key,node) \
({ \
HASH_TYPE(v) **_nn = (v).data + id##_FN(key, (v).size); \
node->id##_NEXT = *_nn; \
*_nn = node; \
})
#define HASH_DELETE(v,id,key) \
({ \
HASH_TYPE(v) **_nn = (v).data + id##_FN(key, (v).size); \
while ((*_nn) && !id##_EQ(*_nn, key)) \
_nn = &((*_nn)->id##_NEXT); \
\
HASH_TYPE(v) *_n = *_nn; \
if (_n) \
*_nn = _n->id##_NEXT; \
_n; \
})
#define HASH_REMOVE(v,id,node) \
({ \
HASH_TYPE(v) **_nn = (v).data + id##_FN(key, (v).size); \
while ((*_nn) && (*_nn != (node))) \
_nn = &((*_nn)->id##_NEXT); \
\
HASH_TYPE(v) *_n = *_nn; \
if (_n) \
*_nn = _n->id##_NEXT; \
_n; \
})
#define HASH_WALK(v,next,n) \
do { \
HASH_TYPE(v) *n; \
uint _i; \
for (_i = 0; _i < ((v).size); _i++) \
for (n = (v).data[_i]; n; n = n->next)
#define HASH_WALK_END } while (0)
#define HASH_WALK_DELSAFE(v,next,n) \
do { \
HASH_TYPE(v) *n, *_next; \
uint _i; \
for (_i = 0; _i < ((v).size); _i++) \
for (n = (v).data[_i]; n && (_next = n->next, 1); n = _next)
#define HASH_WALK_DELSAFE_END } while (0)
/*
define HASH_REHASH(s) \
({ \
type *_n; \
uint _i; \
for (_i = 0; _i < (size_f); _i++) \
for (_n = (hash)[_i]; _n != NULL; _n =
*/

156
lib/heap.h Normal file
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@ -0,0 +1,156 @@
/*
* UCW Library -- Universal Heap Macros
*
* (c) 2001 Martin Mares <mj@ucw.cz>
* (c) 2005 Tomas Valla <tom@ucw.cz>
*
* This software may be freely distributed and used according to the terms
* of the GNU Lesser General Public License.
*/
/**
* [[intro]]
* Introduction
* ------------
*
* Binary heap is a simple data structure, which for example supports efficient insertions, deletions
* and access to the minimal inserted item. We define several macros for such operations.
* Note that because of simplicity of heaps, we have decided to define direct macros instead
* of a <<generic:,macro generator>> as for several other data structures in the Libucw.
*
* A heap is represented by a number of elements and by an array of values. Beware that we
* index this array from one, not from zero as do the standard C arrays.
*
* Most macros use these parameters:
*
* - @type - the type of elements
* - @num - a variable (signed or unsigned integer) with the number of elements
* - @heap - a C array of type @type; the heap is stored in `heap[1] .. heap[num]`; `heap[0]` is unused
* - @less - a callback to compare two element values; `less(x, y)` shall return a non-zero value iff @x is lower than @y
* - @swap - a callback to swap two array elements; `swap(heap, i, j, t)` must swap `heap[i]` with `heap[j]` with possible help of temporary variable @t (type @type).
*
* A valid heap must follow these rules:
*
* - `num >= 0`
* - `heap[i] >= heap[i / 2]` for each `i` in `[2, num]`
*
* The first element `heap[1]` is always lower or equal to all other elements.
*
* [[macros]]
* Macros
* ------
*/
/* For internal usage. */
#define HEAP_BUBBLE_DOWN_J(heap,num,less,swap) \
for (;;) \
{ \
_l = 2*_j; \
if (_l > num) \
break; \
if (less(heap[_j],heap[_l]) && (_l == num || less(heap[_j],heap[_l+1]))) \
break; \
if (_l != num && less(heap[_l+1],heap[_l])) \
_l++; \
swap(heap,_j,_l,x); \
_j = _l; \
}
/* For internal usage. */
#define HEAP_BUBBLE_UP_J(heap,num,less,swap) \
while (_j > 1) \
{ \
_u = _j/2; \
if (less(heap[_u], heap[_j])) \
break; \
swap(heap,_u,_j,x); \
_j = _u; \
}
/**
* Shuffle the unordered array @heap of @num elements to become a valid heap. The time complexity is linear.
**/
#define HEAP_INIT(heap,num,type,less,swap) \
do { \
uns _i = num; \
uns _j, _l; \
type x; \
while (_i >= 1) \
{ \
_j = _i; \
HEAP_BUBBLE_DOWN_J(heap,num,less,swap) \
_i--; \
} \
} while(0)
/**
* Delete the minimum element `heap[1]` in `O(log(n))` time.
* The removed value is moved just after the resulting heap (`heap[num + 1]`).
**/
#define HEAP_DELMIN(heap,num,type,less,swap) \
do { \
uns _j, _l; \
type x; \
swap(heap,1,num,x); \
num--; \
_j = 1; \
HEAP_BUBBLE_DOWN_J(heap,num,less,swap); \
} while(0)
/**
* Insert `heap[num]` in `O(log(n))` time. The value of @num must be increased before.
**/
#define HEAP_INSERT(heap,num,type,less,swap) \
do { \
uns _j, _u; \
type x; \
_j = num; \
HEAP_BUBBLE_UP_J(heap,num,less,swap); \
} while(0)
/**
* If you need to increase the value of `heap[pos]`, just do it and then call this macro to rebuild the heap.
* Only `heap[pos]` can be changed, the rest of the array must form a valid heap.
* The time complexity is `O(log(n))`.
**/
#define HEAP_INCREASE(heap,num,type,less,swap,pos) \
do { \
uns _j, _l; \
type x; \
_j = pos; \
HEAP_BUBBLE_DOWN_J(heap,num,less,swap); \
} while(0)
/**
* If you need to decrease the value of `heap[pos]`, just do it and then call this macro to rebuild the heap.
* Only `heap[pos]` can be changed, the rest of the array must form a valid heap.
* The time complexity is `O(log(n))`.
**/
#define HEAP_DECREASE(heap,num,type,less,swap,pos) \
do { \
uns _j, _u; \
type x; \
_j = pos; \
HEAP_BUBBLE_UP_J(heap,num,less,swap); \
} while(0)
/**
* Delete `heap[pos]` in `O(log(n))` time.
**/
#define HEAP_DELETE(heap,num,type,less,swap,pos) \
do { \
uns _j, _l, _u; \
type x; \
_j = pos; \
swap(heap,_j,num,x); \
num--; \
if (less(heap[_j], heap[num+1])) \
HEAP_BUBBLE_UP_J(heap,num,less,swap) \
else \
HEAP_BUBBLE_DOWN_J(heap,num,less,swap); \
} while(0)
/**
* Default swapping macro.
**/
#define HEAP_SWAP(heap,a,b,t) (t=heap[a], heap[a]=heap[b], heap[b]=t)

21
lib/lists.c
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@ -100,6 +100,27 @@ rem_node(node *n)
x->prev = z; x->prev = z;
} }
/**
* replace_node - replace a node in a list with another one
* @old: node to be removed
* @new: node to be inserted
*
* Replaces node @old in the list it's linked in with node @new. Node
* @old may be a copy of the original node, which is not accessed
* through the list. The function could be called with @old == @new,
* which just fixes neighbors' pointers in the case that the node
* was reallocated.
*/
LIST_INLINE void
replace_node(node *old, node *new)
{
old->next->prev = new;
old->prev->next = new;
new->prev = old->prev;
new->next = old->next;
}
/** /**
* init_list - create an empty list * init_list - create an empty list
* @l: list * @l: list

29
lib/resource.c
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@ -366,21 +366,21 @@ mb_allocz(pool *p, unsigned size)
/** /**
* mb_realloc - reallocate a memory block * mb_realloc - reallocate a memory block
* @p: pool
* @m: memory block * @m: memory block
* @size: new size of the block * @size: new size of the block
* *
* mb_realloc() changes the size of the memory block @m to a given size. * mb_realloc() changes the size of the memory block @m to a given size.
* The contents will be unchanged to the minimum of the old and new sizes; * The contents will be unchanged to the minimum of the old and new sizes;
* newly allocated memory will be uninitialized. If @m is NULL, the call * newly allocated memory will be uninitialized. Contrary to realloc()
* is equivalent to mb_alloc(@p, @size). * behavior, @m must be non-NULL, because the resource pool is inherited
* from it.
* *
* Like mb_alloc(), mb_realloc() also returns a pointer to the memory * Like mb_alloc(), mb_realloc() also returns a pointer to the memory
* chunk , not to the resource, hence you have to free it using * chunk, not to the resource, hence you have to free it using
* mb_free(), not rfree(). * mb_free(), not rfree().
*/ */
void * void *
mb_realloc(pool *p, void *m, unsigned size) mb_realloc(void *m, unsigned size)
{ {
struct mblock *ob = NULL; struct mblock *ob = NULL;
@ -392,9 +392,7 @@ mb_realloc(pool *p, void *m, unsigned size)
} }
struct mblock *b = xrealloc(ob, sizeof(struct mblock) + size); struct mblock *b = xrealloc(ob, sizeof(struct mblock) + size);
replace_node(&b->r.n, &b->r.n);
b->r.class = &mb_class;
add_tail(&p->inside, &b->r.n);
b->size = size; b->size = size;
return b->data; return b->data;
} }
@ -413,3 +411,18 @@ mb_free(void *m)
rfree(b); rfree(b);
} }
#define STEP_UP(x) ((x) + (x)/2 + 4)
void
buffer_realloc(void **buf, unsigned *size, unsigned need, unsigned item_size)
{
unsigned nsize = MIN(*size, need);
while (nsize < need)
nsize = STEP_UP(nsize);
*buf = mb_realloc(*buf, nsize*isize);
*size = nsize;
}

2
lib/socket.h
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@ -44,6 +44,7 @@ typedef struct birdsock {
/* laddr and lifindex are valid only if SKF_LADDR_RX flag is set to request it */ /* laddr and lifindex are valid only if SKF_LADDR_RX flag is set to request it */
int fd; /* System-dependent data */ int fd; /* System-dependent data */
int index; /* Index in poll buffer */
node n; node n;
void *rbuf_alloc, *tbuf_alloc; void *rbuf_alloc, *tbuf_alloc;
char *password; /* Password for MD5 authentication */ char *password; /* Password for MD5 authentication */
@ -91,6 +92,7 @@ extern int sk_priority_control; /* Suggested priority for control traffic, shoul
#define SKF_LADDR_TX 4 /* Allow to specify local address for TX packets */ #define SKF_LADDR_TX 4 /* Allow to specify local address for TX packets */
#define SKF_TTL_RX 8 /* Report TTL / Hop Limit for RX packets */ #define SKF_TTL_RX 8 /* Report TTL / Hop Limit for RX packets */
#define SKF_THREAD 0x100 /* Socked used in thread, Do not add to main loop */
/* /*
* Socket types SA SP DA DP IF TTL SendTo (?=may, -=must not, *=must) * Socket types SA SP DA DP IF TTL SendTo (?=may, -=must not, *=must)

1
proto/Doc
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@ -1,4 +1,5 @@
H Protocols H Protocols
C bfd
C bgp C bgp
C ospf C ospf
C pipe C pipe

1
proto/bfd/Doc Normal file
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@ -0,0 +1 @@
S bfd.c

5
proto/bfd/Makefile Normal file
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@ -0,0 +1,5 @@
source=bfd.c
root-rel=../../
dir-name=proto/bfd
include ../../Rules

496
proto/bfd/bfd.c Normal file
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@ -0,0 +1,496 @@
#include "nest/bird.h"
#include "nest/iface.h"
#include "nest/protocol.h"
#include "nest/route.h"
#include "nest/cli.h"
#include "conf/conf.h"
#include "lib/socket.h"
#include "lib/resource.h"
#include "lib/string.h"
#include "bfd.h"
#define HASH_ID_KEY loc_id
#define HASH_ID_NEXT next_id
#define HASH_ID_EQ(a,b) ((a)==(b))
#define HASH_ID_FN(a) (a)
#define HASH_IP_KEY addr
#define HASH_IP_NEXT next_ip
#define HASH_IP_EQ(a,b) ((a)==(b))
#define HASH_IP_FN(a) (a == b)
static u32
bfd_get_free_id(struct bfd_proto *p)
{
u32 id;
for (id = random_u32(); 1; id++)
if (id && !bfd_find_session_by_id(p, id))
break;
return id;
}
static void
bfd_add_session(struct bfd_proto *p, ip_addr addr, struct bfd_session_config *opts)
{
birdloop_enter(p->loop);
struct bfd_session *s = sl_alloc(p->session_slab);
bzero(s, sizeof(struct bfd_session));
/* Initialization of state variables - see RFC 5880 3.8.1 */
s->loc_state = BFD_STATE_DOWN;
s->rem_state = BFD_STATE_DOWN;
s->loc_id = bfd_get_free_id(p);
s->des_min_tx_int = s->des_min_tx_new = s->opts->idle_tx_int;
s->req_min_rx_int = s->req_min_rx_new = s->opts->min_rx_int;
s->detect_mult = s->opts->multiplier;
s->rem_min_rx_int = 1;
HASH_INSERT(p->session_hash_id, HASH_ID, s);
HASH_INSERT(p->session_hash_ip, HASH_IP, s);
s->tx_timer = tm2_new_set(xxx, bfd_rx_timer_hook, s, 0, 0);
s->hold_timer = tm2_new_set(xxx, bfd_hold_timer_hook, s, 0, 0);
bfd_session_update_tx_interval(s);
birdloop_leave(p->loop);
}
static void
bfd_open_session(struct bfd_proto *p, struct bfd_session *s, ip_addr local, struct iface *ifa)
{
birdloop_enter(p->loop);
s->bsock = bfd_get_socket(p, local, ifa);
s->local = local;
s->iface = ifa;
s->opened = 1;
bfd_session_control_tx_timer(s);
birdloop_leave(p->loop);
}
static void
bfd_close_session(struct bfd_proto *p, struct bfd_session *s)
{
birdloop_enter(p->loop);
bfd_free_socket(s->bsock);
s->bsock = NULL;
s->local = IPA_NONE;
s->iface = NULL;
s->opened = 0;
bfd_session_control_tx_timer(s);
birdloop_leave(p->loop);
}
static void
bfd_remove_session(struct bfd_proto *p, struct bfd_session *s)
{
birdloop_enter(p->loop);
bfd_free_socket(s->bsock);
rfree(s->tx_timer);
rfree(s->hold_timer);
HASH_REMOVE(p->session_hash_id, HASH_ID, s);
HASH_REMOVE(p->session_hash_ip, HASH_IP, s);
sl_free(p->session_slab, s);
birdloop_leave(p->loop);
}
struct bfd_session *
bfd_find_session_by_id(struct bfd_proto *p, u32 id)
{
return HASH_FIND(p->session_hash_id, HASH_ID, id);
}
struct bfd_session *
bfd_find_session_by_addr(struct bfd_proto *p, ip_addr addr)
{
return HASH_FIND(p->session_hash_ip, HASH_IP, addr);
}
static void
bfd_rx_timer_hook(timer2 *t)
{
struct bfd_session *s = timer->data;
s->last_tx = xxx_now;
bfd_send_ctl(s->bfd, s, 0);
}
static void
bfd_hold_timer_hook(timer2 *t)
{
bfd_session_timeout(timer->data);
}
static void
bfd_session_timeout(struct bfd_session *s)
{
s->rem_state = BFD_STATE_DOWN;
s->rem_id = 0;
s->rem_min_tx_int = 0;
s->rem_min_rx_int = 1;
s->rem_demand_mode = 0;
bfd_session_update_state(s, BFD_STATE_DOWN, BFD_DIAG_TIMEOUT);
}
static void
bfd_session_control_tx_timer(struct bfd_session *s)
{
if (!s->opened)
goto stop;
if (s->passive && (s->rem_id == 0))
goto stop;
if (s->rem_demand_mode &&
!s->poll_active &&
(s->loc_state == BFD_STATE_UP) &&
(s->rem_state == BFD_STATE_UP))
goto stop;
if (s->rem_min_rx_int == 0)
goto stop;
/* So TX timer should run */
if (tm2_active(s->tx_timer))
return;
tm2_start(s->tx_timer, 0);
return;
stop:
tm2_stop(s->tx_timer);
s->last_tx = 0;
}
static void
bfd_session_update_tx_interval(struct bfd_session *s)
{
u32 tx_int = MAX(s->des_min_tx_int, s->rem_min_rx_int);
u32 tx_int_l = tx_int - (tx_int / 4); // 75 %
u32 tx_int_h = tx_int - (tx_int / 10); // 90 %
s->tx_timer->recurrent = tx_int_l;
s->tx_timer->randomize = tx_int_h - tx_int_l;
/* Do not set timer if no previous event */
if (!s->last_tx)
return;
/* Set timer relative to last tx_timer event */
tm2_set(s->tx_timer, s->last_tx + tx_int_l);
}
static void
bfd_session_update_detection_time(struct bfd_session *s, int kick)
{
xxx_time timeout = (xxx_time) MAX(s->req_min_rx_int, s->rem_min_tx_int) * s->rem_detect_mult;
if (kick)
s->last_rx = xxx_now;
if (!s->last_rx)
return;
tm2_set(s->hold_timer, s->last_rx + timeout);
}
void
bfd_session_request_poll(struct bfd_session *s, u8 request)
{
s->poll_scheduled |= request;
if (s->poll_active)
return;
s->poll_active = s->poll_scheduled;
s->poll_scheduled = 0;
bfd_send_ctl(s->bfd, s, 0);
}
void
bfd_session_terminate_poll(struct bfd_session *s)
{
u8 poll_done = s->poll_active & ~s->poll_scheduled;
if (poll_done & BFD_POLL_TX)
s->des_min_tx_int = s->des_min_tx_new;
if (poll_done & BFD_POLL_RX)
s->req_min_rx_int = s->req_min_rx_new;
s->poll_active = 0;
/* Timers are updated by caller - bfd_session_process_ctl() */
xxx_restart_poll();
}
void
bfd_session_process_ctl(struct bfd_session *s, u8 flags, u32 old_rx_int, u32 old_tx_int)
{
if (s->poll_active && (flags & BFD_FLAG_FINAL))
bfd_session_terminate_poll(s);
if ((s->des_min_tx_int != old_rx_int) || (s->rem_min_rx_int != old_tx_int))
bfd_session_update_tx_interval(s);
bfd_session_update_detection_time(s, 1);
/* Update session state */
int next_state = 0;
int diag = BFD_DIAG_NOTHING;
switch (s->loc_state)
{
case BFD_STATE_ADMIN_DOWN:
return;
case BFD_STATE_DOWN:
if (s->rem_state == BFD_STATE_DOWN) next_state = BFD_STATE_INIT;
else if (s->rem_state == BFD_STATE_INIT) next_state = BFD_STATE_UP;
break;
case BFD_STATE_INIT:
if (s->rem_state == BFD_STATE_ADMIN_DOWN) next_state = BFD_STATE_DOWN, diag = BFD_DIAG_NEIGHBOR_DOWN;
else if (s->rem_state >= BFD_STATE_INIT) next_state = BFD_STATE_UP;
break;
case BFD_STATE_UP:
if (s->rem_state <= BFD_STATE_DOWN) next_state = BFD_STATE_DOWN, diag = BFD_DIAG_NEIGHBOR_DOWN;
break;
}
if (next_state)
bfd_session_update_state(s, next_state, diag);
bfd_session_control_tx_timer(s);
if (flags & BFD_FLAG_POLL)
bfd_send_ctl(p, s, 1);
}
static void
bfd_session_set_min_tx(struct bfd_session *s, u32 val)
{
/* Note that des_min_tx_int <= des_min_tx_new */
if (val == s->des_min_tx_new)
return;
s->des_min_tx_new = val;
/* Postpone timer update if des_min_tx_int increases and the session is up */
if ((s->loc_state != BFD_STATE_UP) || (val < s->des_min_tx_int))
{
s->des_min_tx_int = val;
bfd_session_update_tx_interval(s);
}
bfd_session_request_poll(s, BFD_POLL_TX);
}
static void
bfd_session_set_min_rx(struct bfd_session *s, u32 val)
{
/* Note that req_min_rx_int >= req_min_rx_new */
if (val == s->req_min_rx_new)
return;
s->req_min_rx_new = val;
/* Postpone timer update if req_min_rx_int decreases and the session is up */
if ((s->loc_state != BFD_STATE_UP) || (val > s->req_min_rx_int))
{
s->req_min_rx_int = val;
bfd_session_update_detection_time(s, 0);
}
bfd_session_request_poll(s, BFD_POLL_RX);
}
static void
bfd_start_neighbor(struct bfd_proto *p, struct bfd_neighbor *n)
{
n->session = bfd_add_session(p, n->addr, n->opts);
if (n->opts->multihop)
{
bfd_open_session(p, n->session, n->local, NULL);
return;
}
struct neighbor *nb = neigh_find2(&p->p, &n->addr, n->iface, NEF_STICKY);
if (!nb)
{
log(L_ERR "%s: Invalid remote address %I%J", p->p.name, n->addr, n->iface);
return;
}
if (nb->data)
{
log(L_ERR "%s: Duplicate remote address %I", p->p.name, n->addr);
return;
}
nb->data = n->session;
if (nb->scope > 0)
bfd_open_session(p, n->session, nb->iface->addr->ip, nb->iface);
else
TRACE(D_EVENTS, "Waiting for %I%J to become my neighbor", n->addr, cf->iface);
}
static void
bfd_stop_neighbor(struct bfd_proto *p, struct bfd_neighbor *n)
{
if (!n->opts->multihop)
{
struct neighbor *nb = neigh_find2(&p->p, &n->addr, n->iface, 0);
if (nb)
nb->data = NULL;
}
bfd_remove_session(p, n->session);
}
static void
bfd_neigh_notify(struct neighbor *nb)
{
struct bfd_proto *p = (struct bfd_proto *) nb->proto;
struct bfd_session *s = nb->data;
if (!s)
return;
if ((nb->scope > 0) && !s->opened)
bfd_open_session(p, s, nb->iface->addr->ip, nb->iface);
if ((nb->scope <= 0) && s->opened)
bfd_close_session(p, s);
}
static struct proto *
bfd_init(struct proto_config *c)
{
struct proto *p = proto_new(c, sizeof(struct bfd_proto));
p->if_notify = bfd_if_notify;
p->ifa_notify = bfd_ifa_notify;
return p;
}
static int
bfd_start(struct proto *P)
{
struct bfd_proto *p = (struct bfd_proto *) P;
struct bfd_config *cf = (struct bfd_config *) (P->cf);
p->session_slab = sl_new(P->pool, sizeof(struct bfd_session));
init_list(&p->sockets);
HASH_INIT(p->session_hash_id, P->pool, 16);
HASH_INIT(p->session_hash_ip, P->pool, 16);
struct bfd_neighbor *n;
WALK_LIST(n, cf->neighbors)
bfd_start_neighbor(p, n);
return PS_UP;
}
static int
bfd_shutdown(struct proto *P)
{
struct bfd_proto *p = (struct bfd_proto *) P;
return PS_DOWN;
}
static inline int
bfd_same_neighbor(struct bfd_neighbor *x, struct bfd_neighbor *y)
{
return ipa_equal(x->addr, y->addr) && ipa_equal(x->local, y->local) &&
(x->iface == y->iface) && (x->opts->multihop == y->opts->multihop);
}
static void
bfd_match_neighbor(struct bfd_proto *p, struct bfd_neighbor *on, struct bfd_config *new)
{
struct bfd_neighbor *nn;
if (r->neigh)
r->neigh->data = NULL;
WALK_LIST(nn, new->neighbors)
if (bfd_same_neighbor(nn, on))
{
nn->session = on->session;
// XXX reconfiguration of session?
return;
}
bfd_stop_neighbor(p, on);
}
static int
bfd_reconfigure(struct proto *P, struct proto_config *c)
{
struct bfd_proto *p = (struct bfd_proto *) P;
struct bfd_config *old = (struct bfd_config *) (P->cf);
struct bfd_config *new = (struct bfd_config *) c;
struct bfd_neighbor *n;
WALK_LIST(n, old->neighbors)
bfd_match_neighbor(p, n, new);
WALK_LIST(n, new->neighbors)
if (!n->session)
bfd_start_neighbor(p, n);
return 1;
}
static void
bfd_copy_config(struct proto_config *dest, struct proto_config *src)
{
struct bfd_config *d = (struct bfd_config *) dest;
struct bfd_config *s = (struct bfd_config *) src;
/* We clean up patt_list, ifaces are non-sharable */
init_list(&d->patt_list);
/* We copy pref_list, shallow copy suffices */
cfg_copy_list(&d->pref_list, &s->pref_list, sizeof(struct bfd_prefix_config));
}
struct protocol proto_bfd = {
.name = "BFD",
.template = "bfd%d",
.init = bfd_init,
.start = bfd_start,
.shutdown = bfd_shutdown,
.reconfigure = bfd_reconfigure,
.copy_config = bfd_copy_config,
};

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#ifndef _BIRD_BFD_H_
#define _BIRD_BFD_H_
#define BFD_CONTROL_PORT 3784
#define BFD_ECHO_PORT 3785
#define BFD_MULTI_CTL_PORT 4784
#define BFD_DEFAULT_MIN_RX_INT (10 MS)
#define BFD_DEFAULT_MIN_TX_INT (100 MS)
#define BFD_DEFAULT_IDLE_TX_INT (1 S)
#define BFD_DEFAULT_MULTIPLIER 5
struct bfd_config
{
struct proto_config c;
list neighbors; /* List of struct bfd_neighbor */
};
struct bfd_session_config
{
u32 min_rx_int;
u32 min_tx_int;
u32 idle_tx_int;
u8 multiplier;
u8 multihop;
u8 passive;
};
struct bfd_neighbor
{
node n;
ip_addr addr;
ip_addr local;
struct iface *iface;
struct bfd_session_config *opts;
struct bfd_session *session;
};
struct bfd_proto
{
struct proto p;
slab *session_slab;
HASH(struct bfd_session) session_hash_id;
HASH(struct bfd_session) session_hash_ip;
list sockets;
};
struct bfd_socket
{
node n;
sock *sk;
u32 uc;
};
struct bfd_session
{
node n;
struct bfd_session *next_id; /* Next in bfd.session_hash_id */
struct bfd_session *next_ip; /* Next in bfd.session_hash_ip */
u8 opened;
u8 poll_active;
u8 poll_scheduled;
u8 loc_state;
u8 rem_state;
u8 loc_diag;
u32 loc_id; /* Local session ID (local discriminator) */
u32 rem_id; /* Remote session ID (remote discriminator) */
u32 des_min_tx_int; /* Desired min rx interval, local option */
u32 des_min_tx_new; /* Used for des_min_tx_int change */
u32 req_min_rx_int; /* Required min tx interval, local option */
u32 req_min_rx_new; /* Used for req_min_rx_int change */
u32 rem_min_tx_int; /* Last received des_min_tx_int */
u32 rem_min_rx_int; /* Last received req_min_rx_int */
u8 demand_mode; /* Currently unused */
u8 rem_demand_mode;
u8 detect_mult; /* Announced detect_mult, local option */
u8 rem_detect_mult; /* Last received detect_mult */
xxx_time last_tx; /* Time of last sent periodic control packet */
xxx_time last_rx; /* Time of last received valid control packet */
timer2 *tx_timer; /* Periodic control packet timer */
timer2 *hold_timer; /* Timer for session down detection time */
};
#define BFD_STATE_ADMIN_DOWN 0
#define BFD_STATE_DOWN 1
#define BFD_STATE_INIT 2
#define BFD_STATE_UP 3
#define BFD_DIAG_NOTHING 0
#define BFD_DIAG_TIMEOUT 1
#define BFD_DIAG_ECHO_FAILED 2
#define BFD_DIAG_NEIGHBOR_DOWN 3
#define BFD_DIAG_FWD_RESET 4
#define BFD_DIAG_PATH_DOWN 5
#define BFD_DIAG_C_PATH_DOWN 6
#define BFD_DIAG_ADMIN_DOWN 7
#define BFD_DIAG_RC_PATH_DOWN 8
#define BFD_POLL_TX 1
#define BFD_POLL_RX 2
#endif _BIRD_BFD_H_

113
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/*
* BIRD -- Router Advertisement Configuration
*
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
CF_HDR
#include "proto/bfd/bfd.h"
CF_DEFINES
#define BFD_CFG ((struct bfd_config *) this_proto)
#define BFD_SESSION this_bfd_session
#define BFD_NEIGHBOR this_bfd_neighbor
static struct bfd_session_config *this_bfd_session;
static struct bfd_neighbor *this_bfd_neighbor;
CF_DECLS
CF_KEYWORDS(BFD, MIN, IDLE, RX, TX, INTERVAL, MULTIPLIER, MULTIHOP, PASSIVE,
NEIGHBOR)
%type <iface> bfd_neigh_iface
%type <a> bfd_neigh_local
CF_GRAMMAR
CF_ADDTO(proto, bfd_proto)
bfd_proto_start: proto_start BFD
{
this_proto = proto_config_new(&proto_bfd, sizeof(struct bfd_config), $1);
init_list(&BFD_CFG->neighbors);
};
bfd_proto_item:
proto_item
| bfd_neighbor
;
bfd_proto_opts:
/* empty */
| bfd_proto_opts bfd_proto_item ';'
;
bfd_proto:
bfd_proto_start proto_name '{' bfd_proto_opts '}';
bfd_session_start:
{
this_bfd_session = cfg_allocz(sizeof(struct bfd_session_config));
BFD_SESSION->min_rx_int = BFD_DEFAULT_MIN_RX_INT;
BFD_SESSION->min_tx_int = BFD_DEFAULT_MIN_TX_INT;
BFD_SESSION->idle_tx_int = BFD_DEFAULT_IDLE_TX_INT;
BFD_SESSION->multiplier = BFD_DEFAULT_MULTIPLIER;
};
bfd_session_item:
INTERVAL expr_us { BFD_SESSION->min_rx_int = BFD_SESSION->min_tx_int = $2; }
| MIN RX INTERVAL expr_us { BFD_SESSION->min_rx_int = $4; }
| MIN TX INTERVAL expr_us { BFD_SESSION->min_tx_int = $4; }
| IDLE TX INTERVAL expr_us { BFD_SESSION->idle_tx_int = $4; }
| MULTIPLIER expr { BFD_SESSION->multiplier = $2; }
| MULTIHOP bool { BFD_SESSION->multihop = $2; }
| PASSIVE bool { BFD_SESSION->passive = $2; }
;
bfd_session_opts:
/* empty */
| bfd_session_opts bfd_session_item ';'
;
bfd_session_opt_list:
/* empty */
| '{' bfd_session_opts '}'
;
bfd_session:
bfd_session_start bfd_session_opt_list;
bfd_neigh_iface:
/* empty */ { $$ = NULL; }
| '%' SYM { $$ = if_get_by_name($2->name); }
| DEV TEXT { $$ = if_get_by_name($2); }
;
bfd_neigh_local:
/* empty */ { $$ = IPA_NONE; }
| LOCAL ipa { $$ = $2; }
;
bfd_neighbor: NEIGHBOR ipa bfd_neigh_iface bfd_neigh_local bfd_session
{
this_bfd_neighbor = cfg_allocz(sizeof(struct bfd_neighbor));
add_tail(&BFD_CFG->neighbors, NODE this_bfd_neighbor);
BFD_NEIGHBOR->addr = $2;
BFD_NEIGHBOR->local = $4;
BFD_NEIGHBOR->iface = $3;
BFD_NEIGHBOR->opts = BFD_SESSION;
};
CF_CODE
CF_END

587
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#include "lib/buffer.h"
#include "lib/heap.h"
struct birdloop
{
pool *pool;
int wakeup_fds[2];
u8 poll_active;
xxx_time last_time;
xxx_time real_time;
u8 use_monotonic_clock;
BUFFER(timer2 *) timers;
list event_list;
list sock_list;
uint sock_num;
BUFFER(sock *) poll_sk;
BUFFER(struct pollfd) poll_fd;
u8 poll_changed;
u8 close_scheduled;
};
static void times_update_alt(struct birdloop *loop);
static int
times_init(struct birdloop *loop)
{
struct timespec ts;
int rv;
rv = clock_gettime(CLOCK_MONOTONIC, &ts);
if (rv < 0)
{
// log(L_WARN "Monotonic clock is missing");
loop->use_monotonic_clock = 0;
loop->last_time = 0;
loop->real_time = 0;
times_update_alt(loop);
return;
}
/*
if ((tv.tv_sec < 0) || (((s64) tv.tv_sec) > ((s64) 1 << 40)))
log(L_WARN "Monotonic clock is crazy");
*/
loop->use_monotonic_clock = 1;
loop->last_time = (tv.tv_sec S) + (tv.tv_nsec / 1000);
loop->real_time = 0;
}
static void
times_update_pri(struct birdloop *loop)
{
struct timespec ts;
int rv;
rv = clock_gettime(CLOCK_MONOTONIC, &ts);
if (rv < 0)
die("clock_gettime: %m");
xxx_time new_time = (tv.tv_sec S) + (tv.tv_nsec / 1000);
/*
if (new_time < loop->last_time)
log(L_ERR "Monotonic clock is broken");
*/
loop->last_time = new_time;
loop->real_time = 0;
}
static void
times_update_alt(struct birdloop *loop)
{
struct timeval tv;
int rv;
rv = gettimeofday(&tv, NULL);
if (rv < 0)
die("gettimeofday: %m");
xxx_time new_time = (tv.tv_sec S) + tv.tv_usec;
xxx_time delta = new_time - loop->real_time;
if ((delta < 0) || (delta > (60 S)))
{
/*
if (loop->real_time)
log(L_WARN "Time jump, delta %d us", (int) delta);
*/
delta = 100 MS;
}
loop->last_time += delta;
loop->real_time = new_time;
}
static void
times_update(struct birdloop *loop)
{
if (loop->use_monotonic_clock)
times_update_pri(loop);
else
times_update_alt(loop);
}
static void
pipe_new(int *pfds)
{
int pfds[2], rv;
sock *sk;
rv = pipe(pfds);
if (rv < 0)
die("pipe: %m");
if (fcntl(pfds[0], F_SETFL, O_NONBLOCK) < 0)
die("fcntl(O_NONBLOCK): %m");
if (fcntl(pfds[1], F_SETFL, O_NONBLOCK) < 0)
die("fcntl(O_NONBLOCK): %m");
}
static void
wakeup_init(struct birdloop *loop)
{
pipe_new(loop->wakeup_fds);
}
static void
wakeup_drain(struct birdloop *loop)
{
char buf[64];
int rv;
try:
rv = read(loop->wakeup_fds[0], buf, 64);
if (rv < 0)
{
if (errno == EINTR)
goto try;
if (errno == EAGAIN)
return;
die("wakeup read: %m");
}
if (rv == 64)
goto try;
}
static void
wakeup_kick(struct birdloop *loop)
{
u64 v = 1;
int rv;
try:
rv = write(loop->wakeup_fds[1], &v, sizeof(u64));
if (rv < 0)
{
if (errno == EINTR)
goto try;
if (errno == EAGAIN)
return;
die("wakeup write: %m");
}
}
static inline uint events_waiting(struct birdloop *loop)
{ return !EMPTY_LIST(loop->event_list); }
static void
events_init(struct birdloop *loop)
{
list_init(&poll->event_list);
}
static void
events_fire(struct birdloop *loop)
{
times_update(loop);
ev_run_list(&loop->event_list);
}
void
ev2_schedule(event *e)
{
if (loop->poll_active && EMPTY_LIST(loop->event_list))
wakeup_kick(loop);
if (e->n.next)
rem_node(&e->n);
add_tail(&loop->event_list, &e->n);
}
#define TIMER_LESS(a,b) ((a)->expires < (b)->expires)
#define TIMER_SWAP(heap,a,b,t) (t = heap[a], heap[a] = heap[b], heap[b] = t, \
heap[a]->index = (a), heap[b]->index = (b))
static inline uint timers_count(struct birdloop *loop)
{ return loop->timers.used - 1; }
static inline timer2 *timers_first(struct birdloop *loop)
{ return (loop->timers.used > 1) ? loop->timers.data[1] : NULL; }
static void
tm2_free(resource *r)
{
timer2 *t = (timer2 *) r;
tm2_stop(t);
}
static void
tm2_dump(resource *r)
{
timer2 *t = (timer2 *) r;
debug("(code %p, data %p, ", t->hook, t->data);
if (t->randomize)
debug("rand %d, ", t->randomize);
if (t->recurrent)
debug("recur %d, ", t->recurrent);
if (t->expires)
debug("expires in %d sec)\n", t->expires - xxx_now);
else
debug("inactive)\n");
}
static struct resclass tm2_class = {
"Timer",
sizeof(timer),
tm2_free,
tm2_dump,
NULL,
NULL
};
timer2 *
tm2_new(pool *p)
{
timer2 *t = ralloc(p, &tm2_class);
t->index = -1;
return t;
}
void
tm2_start(timer2 *t, xxx_time after)
{
xxx_time when = loop->last_time + after;
uint tc = timers_count(loop);
if (!t->expires)
{
t->index = ++tc;
t->expires = when;
BUFFER_PUSH(loop->timers) = t;
HEAP_INSERT(loop->timers.data, tc, timer2 *, TIMER_LESS, TIMER_SWAP);
}
else if (t->expires < when)
{
t->expires = when;
HEAP_INCREASE(loop->timers.data, tc, timer2 *, TIMER_LESS, TIMER_SWAP, t->index);
}
else if (t->expires > when)
{
t->expires = when;
HEAP_DECREASE(loop->timers.data, tc, timer2 *, TIMER_LESS, TIMER_SWAP, t->index);
}
if (loop->poll_active && (t->index == 1))
wakeup_kick(loop);
}
void
tm2_stop(timer2 *t)
{
if (!t->expires)
return;
uint tc = timers_count(XXX);
HEAP_DELETE(loop->timers.data, tc, timer2 *, TIMER_LESS, TIMER_SWAP, t->index);
BUFFER_POP(loop->timers);
t->index = -1;
t->expires = 0;
}
static void
timers_init(struct birdloop *loop)
{
BUFFER_INIT(loop->timers, loop->pool, 4);
BUFFER_PUSH(loop->timers) = NULL;
}
static void
timers_fire(struct birdloop *loop)
{
xxx_time base_time;
timer2 *t;
times_update(loop);
base_time = loop->last_time;
while (t = timers_first(loop))
{
if (t->expires > base_time)
return;
if (t->recurrent)
{
xxx_time after = t->recurrent;
xxx_time delta = loop->last_time - t->expires;
if (t->randomize)
after += random() % (t->randomize + 1);
if (delta > after)
delta = 0;
tm2_start(t, after - delta);
}
else
tm2_stop(t);
t->hook(t);
}
}
static void
sockets_init(struct birdloop *loop)
{
list_init(&poll->sock_list);
poll->sock_num = 0;
BUFFER_INIT(loop->poll_sk, loop->pool, 4);
BUFFER_INIT(loop->poll_fd, loop->pool, 4);
poll_changed = 0;
}
static void
sockets_add(struct birdloop *loop, sock *s)
{
add_tail(&loop->sock_list, &s->n);
loop->sock_num++;
s->index = -1;
loop->poll_changed = 1;
if (loop->poll_active)
wakeup_kick(loop);
}
void
sk_start(sock *s)
{
sockets_add(xxx_loop, s);
}
static void
sockets_remove(struct birdloop *loop, sock *s)
{
rem_node(&s->n);
loop->sock_num--;
if (s->index >= 0)
s->poll_sk.data[sk->index] = NULL;
s->index = -1;
loop->poll_changed = 1;
/* Wakeup moved to sk_stop() */
}
void
sk_stop(sock *s)
{
sockets_remove(xxx_loop, s);
if (loop->poll_active)
{
loop->close_scheduled = 1;
wakeup_kick(loop);
}
else
close(s->fd);
s->fd = -1;
}
static inline uint sk_want_events(sock *s)
{ return (s->rx_hook ? POLLIN : 0) | ((s->ttx != s->tpos) ? POLLOUT : 0); }
static void
sockets_update(struct birdloop *loop, sock *s)
{
if (s->index >= 0)
s->poll_fd.data[s->index].events = sk_want_events(s);
}
static void
sockets_prepare(struct birdloop *loop)
{
BUFFER_SET(loop->poll_sk, loop->sock_num + 1);
BUFFER_SET(loop->poll_fd, loop->sock_num + 1);
struct pollfd *pfd = loop->poll_fd.data;
sock **psk = loop->poll_sk.data;
int i = 0;
node *n;
WALK_LIST(n, &loop->sock_list)
{
sock *s = SKIP_BACK(sock, n, n);
ASSERT(i < loop->sock_num);
s->index = i;
*psk = s;
pfd->fd = s->fd;
pfd->events = sk_want_events(s);
pfd->revents = 0;
pfd++;
psk++;
i++;
}
ASSERT(i == loop->sock_num);
/* Add internal wakeup fd */
*psk = NULL;
pfd->fd = loop->wakeup_fds[0];
pfd->events = POLLIN;
pfd->revents = 0;
loop->poll_changed = 0;
}
static void
sockets_close_fds(struct birdloop *loop)
{
struct pollfd *pfd = loop->poll_fd.data;
sock **psk = loop->poll_sk.data;
int poll_num = loop->poll_fd.used - 1;
int i;
for (i = 0; i < poll_num; i++)
if (psk[i] == NULL)
close(pfd[i].fd);
loop->close_scheduled = 0;
}
static void
sockets_fire(struct birdloop *loop)
{
struct pollfd *pfd = loop->poll_fd.data;
sock **psk = loop->poll_sk.data;
int poll_num = loop->poll_fd.used - 1;
times_update(loop);
/* Last fd is internal wakeup fd */
if (pfd[loop->sock_num].revents & POLLIN)
wakeup_drain(loop);
int i;
for (i = 0; i < poll_num; pfd++, psk++, i++)
{
int e = 1;
if (! pfd->revents)
continue;
if (pfd->revents & POLLNVAL)
die("poll: invalid fd %d", pfd->fd);
if (pfd->revents & POLLIN)
while (e && *psk && (*psk)->rx_hook)
e = sk_read(*psk);
e = 1;
if (pfd->revents & POLLOUT)
while (e && *psk)
e = sk_write(*psk);
}
}
struct birdloop *
birdloop_new(pool *p)
{
struct birdloop *loop = mb_allocz(p, sizeof(struct birdloop));
p->pool = p;
times_init(loop);
wakeup_init(loop);
events_init(loop);
timers_init(loop);
sockets_init(loop);
return loop;
}
void
birdloop_enter(struct birdloop *loop)
{
pthread_mutex_lock(loop->mutex);
}
void
birdloop_leave(struct birdloop *loop)
{
pthread_mutex_unlock(loop->mutex);
}
void
birdloop_main(struct birdloop *loop)
{
timer2 *t;
int timeout;
while (1)
{
events_fire(loop);
timers_fire(loop);
times_update(loop);
if (events_waiting(loop))
timeout = 0;
else if (t = timers_first(loop))
timeout = (tm2_remains(t) TO_MS) + 1;
else
timeout = -1;
if (loop->poll_changed)
sockets_prepare(loop);
loop->poll_active = 1;
pthread_mutex_unlock(loop->mutex);
try:
rv = poll(loop->poll_fd.data, loop->poll_fd.used, timeout);
if (rv < 0)
{
if (errno == EINTR || errno == EAGAIN)
goto try;
die("poll: %m");
}
pthread_mutex_lock(loop->mutex);
loop->poll_active = 0;
if (loop->close_scheduled)
sockets_close_fds(loop);
if (rv)
sockets_fire(loop);
timers_fire(loop);
}
}

62
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typedef s64 xxx_time;
typedef struct timer
{
resource r;
void (*hook)(struct timer2 *);
void *data;
xxx_time expires; /* 0=inactive */
unsigned randomize; /* Amount of randomization */
unsigned recurrent; /* Timer recurrence */
int index;
} timer;
void ev2_schedule(event *e);
timer2 *tm2_new(pool *p);
void tm2_start(timer2 *t, xxx_time after);
void tm2_stop(timer2 *t);
static inline xxx_time
tm2_remains(timer2 *t)
{
return (t->expires > xxxnow) ? t->expires - xxxnow : 0;
}
static inline void
tm2_start_max(timer2 *t, xxx_time after)
{
xxx_time rem = tm2_remains(t);
tm2_start(t, MAX(rem, after));
}
static inline timer2 *
tm2_new_set(pool *p, void (*hook)(struct timer2 *), void *data, uint rec, uint rand)
{
timer2 *t = tm2_new(p);
t->hook = hook;
t->data = data;
t->recurrent = rec;
t->randomize = rand;
return t;
}
void sk_start(sock *s);
void sk_stop(sock *s);
struct birdloop *birdloop_new(pool *p);
void birdloop_enter(struct birdloop *loop);
void birdloop_leave(struct birdloop *loop);
void birdloop_main(struct birdloop *loop);

208
proto/bfd/packets.c Normal file
View File

@ -0,0 +1,208 @@
#define BFD_FLAG_POLL (1 << 5)
#define BFD_FLAG_FINAL (1 << 4)
#define BFD_FLAG_CPI (1 << 3)
#define BFD_FLAG_AP (1 << 2)
#define BFD_FLAG_DEMAND (1 << 1)
#define BFD_FLAG_MULTIPOINT (1 << 0)
struct bfd_ctl_packet
{
u8 vdiag; /* version and diagnostic */
u8 flags; /* state and flags */
u8 detect_mult;
u8 length;
u32 snd_id; /* sender ID, aka 'my discriminator' */
u32 rcv_id; /* receiver ID, aka 'your discriminator' */
u32 des_min_tx_int;
u32 req_min_rx_int;
u32 req_min_echo_rx_int;
};
static inline void bfd_pack_vdiag(u8 version, u8 diag)
{ return (version << 5) | diag; }
static inline void bfd_pack_flags(u8 state, u8 flags)
{ return (state << 6) | diag; }
static inline u8 bfd_pkt_get_version(struct bfd_ctl_packet *pkt)
{ return pkt->vdiag >> 5; }
static inline u8 bfd_pkt_get_diag(struct bfd_ctl_packet *pkt)
{ return pkt->vdiag && 0x1f; }
static inline u8 bfd_pkt_get_state(struct bfd_ctl_packet *pkt)
{ return pkt->flags >> 6; }
static inline void bfd_pkt_set_state(struct bfd_ctl_packet *pkt, u8 val)
{ pkt->flags = val << 6; }
void
bfd_send_ctl(struct bfd_proto *p, struct bfd_session *s, int final)
{
sock *sk = p->skX;
struct bfd_ctl_packet *pkt = (struct ospf_packet *) sk->tbuf;
pkt->vdiag = bfd_pack_vdiag(1, s->loc_diag);
pkt->flags = bfd_pack_flags(s->loc_state, 0);
pkt->detect_mult = s->detect_mult;
pkt->length = 24;
pkt->snd_id = htonl(s->loc_id);
pkt->rcv_id = htonl(s->rem_id);
pkt->des_min_tx_int = htonl(s->des_min_tx_int);
pkt->req_min_rx_int = htonl(s->req_min_rx_int);
pkt->req_min_echo_rx_int = 0;
if (final)
pkt->flags |= BFD_FLAG_FINAL;
else if (s->poll_active)
pkt->flags |= BFD_FLAG_POLL;
// XXX
sk_send_to(sk, len, dst, 0);
}
int
bfd_ctl_rx_hook(sock *sk, int len)
{
struct bfd_proto *p = sk->data;
struct bfd_ctl_packet *pkt =sk->rbuf;
if (len < BFD_BASE_LEN)
DROP("too short", len);
u8 version = bfd_pkt_get_version(pkt);
if (version != 1)
DROP("version mismatch", version);
if ((pkt->length < BFD_BASE_LEN) || (pkt->length > len))
DROP("length mismatch", pkt->length);
if (pkt->detect_mult == 0)
DROP("invalid detect mult", 0);
if (pkt->flags & BFD_FLAG_MULTIPOINT)
DROP("invalid flags", pkt->flags);
if (pkt->snd_id == 0)
DROP("invalid my discriminator", 0);
struct bfd_session *s;
u32 id = ntohl(pkt->rcv_id);
if (id)
{
s = bfd_find_session_by_id(p, id);
if (!s)
DROP("unknown session", id);
}
else
{
u8 ps = bfd_pkt_get_state(pkt);
if (ps > BFD_STATE_DOWN)
DROP("invalid init state", ps);
s = bfd_find_session_by_ip(p, sk->faddr);
/* FIXME: better session matching and message */
if (!s || !s->opened)
return;
}
/* FIXME: better authentication handling and message */
if (pkt->flags & BFD_FLAG_AP)
DROP("authentication not supported", 0);
u32 old_rx_int = s->des_min_tx_int;
u32 old_tx_int = s->rem_min_rx_int;
s->rem_id = ntohl(pkt->snd_id);
s->rem_state = bfd_pkt_get_state(pkt);
s->rem_demand_mode = pkt->flags & BFD_FLAG_DEMAND;
s->rem_min_tx_int = ntohl(pkt->des_min_tx_int);
s->rem_min_rx_int = ntohl(pkt->req_min_rx_int);
s->rem_detect_mult = pkt->detect_mult;
bfd_session_process_ctl(s, pkt->flags, xxx);
return 1;
drop:
// log(L_WARN "%s: Bad packet from %I - %s (%u)", p->p.name, sk->faddr, err_dsc, err_val);
return 1;
}
sock *
bfd_open_rx_sk(struct bfd_proto *p, int multihop)
{
sock *sk = sk_new(p->p.pool);
sk->type = SK_UDP;
sk->sport = !multihop ? BFD_CONTROL_PORT : BFD_MULTI_CTL_PORT;
sk->data = p;
sk->rbsize = 64; // XXX
sk->rx_hook = bfd_rx_hook;
sk->err_hook = bfd_err_hook;
sk->flags = SKF_LADDR_RX | (!multihop ? SKF_TTL_RX : 0);
if (sk_open(sk) < 0)
goto err;
}
static inline sock *
bfd_open_tx_sk(struct bfd_proto *p, ip_addr local, struct iface *ifa)
{
sock *sk = sk_new(p->p.pool);
sk->type = SK_UDP;
sk->saddr = local;
sk->data = p;
sk->tbsize = 64; // XXX
sk->err_hook = bfd_err_hook;
sk->iface = new;
sk->tos = PATT->tx_tos;
sk->priority = PATT->tx_priority;
sk->ttl = PATT->ttl_security ? 255 : 1;
if (sk_open(sk) < 0)
goto err;
}
struct bfd_socket *
bfd_get_socket(struct bfd_proto *p, ip_addr local, struct iface *ifa)
{
struct bfd_socket *sk;
WALK_LIST(sk, p->sockets)
if (ipa_equal(sk->sk->saddr, local) && (sk->sk->iface == ifa))
return sk->uc++, sk;
sk = mb_allocz(p->p.pool, sizeof(struct bfd_socket));
sk->sk = bfd_open_tx_sk(p, local, ifa);
sk->uc = 1;
add_tail(&p->sockets, &sk->n);
return sk;
}
void
bfd_free_socket(struct bfd_socket *sk)
{
if (!sk || --sk->uc)
return;
rem_node(&sk->n);
sk_stop(sk->sk);
rfree(sk->sk);
mb_free(sk);
}

6
sysdep/unix/io.c
View File

@ -1231,7 +1231,8 @@ sk_open(sock *s)
#endif #endif
} }
sk_insert(s); if (!(s->flags & SKF_THREAD))
sk_insert(s);
return 0; return 0;
bad: bad:
@ -1514,7 +1515,8 @@ sk_write(sock *s)
default: default:
if (s->ttx != s->tpos && sk_maybe_write(s) > 0) if (s->ttx != s->tpos && sk_maybe_write(s) > 0)
{ {
s->tx_hook(s); if (s->tx_hook)
s->tx_hook(s);
return 1; return 1;
} }
return 0; return 0;