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-rw-r--r--nest/iface.c333
-rw-r--r--nest/iface.h53
-rw-r--r--nest/protocol.h5
-rw-r--r--nest/rt-dev.c23
4 files changed, 299 insertions, 115 deletions
diff --git a/nest/iface.c b/nest/iface.c
index 002646b..069b740 100644
--- a/nest/iface.c
+++ b/nest/iface.c
@@ -31,17 +31,22 @@ static list neigh_list;
static int
if_connected(ip_addr *a, struct iface *i) /* -1=error, 1=match, 0=no match */
{
+ struct ifa *b;
+
if (!(i->flags & IF_UP))
return 0;
- if ((i->flags & IF_UNNUMBERED) && ipa_equal(*a, i->opposite))
+ if ((i->flags & IF_UNNUMBERED) && ipa_equal(*a, i->addr->opposite))
return 1;
- if (!ipa_in_net(*a, i->prefix, i->pxlen))
- return 0;
- if (ipa_equal(*a, i->prefix) || /* Network address */
- ipa_equal(*a, i->brd) || /* Broadcast */
- ipa_equal(*a, i->ip)) /* Our own address */
- return -1;
- return 1;
+ WALK_LIST(b, i->addrs)
+ if (ipa_in_net(*a, b->prefix, b->pxlen))
+ {
+ if (ipa_equal(*a, b->prefix) || /* Network address */
+ ipa_equal(*a, b->brd) || /* Broadcast */
+ ipa_equal(*a, b->ip)) /* Our own address */
+ return -1;
+ return 1;
+ }
+ return 0;
}
neighbor *
@@ -69,7 +74,7 @@ neigh_find(struct proto *p, ip_addr *a, unsigned flags)
case -1:
return NULL;
case 1:
- if (!j || j->pxlen > i->pxlen)
+ if (!j) /* FIXME: Search for _optimal_ iface route? */
j = i;
/* Fall-thru */
}
@@ -188,8 +193,18 @@ neigh_prune(void)
list iface_list;
void
+ifa_dump(struct ifa *a)
+{
+ debug("\t%I, net %I/%-2d bc %I -> %I%s%s\n", a->ip, a->prefix, a->pxlen, a->brd, a->opposite,
+ (a->flags & IF_UP) ? "" : " DOWN",
+ (a->flags & IA_PRIMARY) ? "" : " SEC");
+}
+
+void
if_dump(struct iface *i)
{
+ struct ifa *a;
+
debug("IF%d: %s", i->index, i->name);
if (i->flags & IF_ADMIN_DOWN)
debug(" ADMIN-DOWN");
@@ -213,8 +228,14 @@ if_dump(struct iface *i)
debug(" LOOP");
if (i->flags & IF_IGNORE)
debug(" IGN");
+ if (i->flags & IF_TMP_DOWN)
+ debug(" TDOWN");
debug(" MTU=%d\n", i->mtu);
- debug("\t%I, net %I/%-2d bc %I -> %I\n", i->ip, i->prefix, i->pxlen, i->brd, i->opposite);
+ WALK_LIST(a, i->addrs)
+ {
+ ifa_dump(a);
+ ASSERT((a != i->addr) == !(a->flags & IA_PRIMARY));
+ }
}
void
@@ -228,151 +249,200 @@ if_dump_all(void)
debug("Router ID: %08x\n", config->router_id);
}
-static inline int
-if_change_too_big_p(struct iface *i, struct iface *j)
+static inline unsigned
+if_what_changed(struct iface *i, struct iface *j)
{
- if (!ipa_equal(i->ip, j->ip) || /* Address change isn't */
- !ipa_equal(i->prefix, j->prefix) ||
- i->pxlen != j->pxlen ||
- !ipa_equal(i->brd, j->brd) ||
- !ipa_equal(i->opposite, j->opposite))
- return 1;
- if ((i->flags ^ j->flags) & ~(IF_UP | IF_ADMIN_DOWN | IF_UPDATED | IF_LINK_UP))
- return 1; /* Interface type change isn't as well */
- return 0;
+ unsigned c;
+
+ if (((i->flags ^ j->flags) & ~(IF_UP | IF_ADMIN_DOWN | IF_UPDATED | IF_LINK_UP | IF_TMP_DOWN | IF_JUST_CREATED))
+ || i->index != j->index)
+ return IF_CHANGE_TOO_MUCH;
+ c = 0;
+ if ((i->flags ^ j->flags) & IF_UP)
+ c |= (i->flags & IF_UP) ? IF_CHANGE_DOWN : IF_CHANGE_UP;
+ if (i->mtu != j->mtu)
+ c |= IF_CHANGE_MTU;
+ return c;
}
static inline void
if_copy(struct iface *to, struct iface *from)
{
- to->flags = from->flags;
+ to->flags = from->flags | (to->flags & IF_TMP_DOWN);
to->mtu = from->mtu;
- to->index = from->index;
- to->neigh = from->neigh;
}
-static unsigned
-if_changed(struct iface *i, struct iface *j)
+static void
+ifa_notify_change(unsigned c, struct ifa *a)
{
- unsigned f = 0;
+ struct proto *p;
- if (i->mtu != j->mtu)
- f |= IF_CHANGE_MTU;
- if ((i->flags ^ j->flags) & ~IF_UPDATED)
- {
- f |= IF_CHANGE_FLAGS;
- if ((i->flags ^ j->flags) & IF_UP)
- if (i->flags & IF_UP)
- f |= IF_CHANGE_DOWN;
- else
- f |= IF_CHANGE_UP;
- }
- return f;
+ debug("IFA change notification (%x) for %s:%I\n", c, a->iface->name, a->ip);
+ WALK_LIST(p, proto_list)
+ if (p->ifa_notify)
+ p->ifa_notify(p, c, a);
}
static void
-if_notify_change(unsigned c, struct iface *old, struct iface *new, struct iface *real)
+if_notify_change(unsigned c, struct iface *i)
{
struct proto *p;
+ struct ifa *a;
- debug("Interface change notification (%x) for %s\n", c, new->name);
- if (old)
- if_dump(old);
- if (new)
- if_dump(new);
+ if (i->flags & IF_JUST_CREATED)
+ {
+ i->flags &= ~IF_JUST_CREATED;
+ c |= IF_CHANGE_CREATE | IF_CHANGE_MTU;
+ }
+
+ debug("Interface change notification (%x) for %s\n", c, i->name);
+ if_dump(i);
if (c & IF_CHANGE_UP)
- neigh_if_up(real);
+ neigh_if_up(i);
+ if (c & IF_CHANGE_DOWN)
+ WALK_LIST(a, i->addrs)
+ {
+ a->flags = (i->flags & ~IA_FLAGS) | (a->flags & IA_FLAGS);
+ ifa_notify_change(IF_CHANGE_DOWN, a);
+ }
WALK_LIST(p, proto_list)
if (p->if_notify)
- p->if_notify(p, c, new, old);
+ p->if_notify(p, c, i);
+ if (c & IF_CHANGE_UP)
+ WALK_LIST(a, i->addrs)
+ {
+ a->flags = (i->flags & ~IA_FLAGS) | (a->flags & IA_FLAGS);
+ ifa_notify_change(IF_CHANGE_UP, a);
+ }
if (c & IF_CHANGE_DOWN)
- neigh_if_down(real);
+ neigh_if_down(i);
}
-void
+static unsigned
+if_recalc_flags(struct iface *i, unsigned flags)
+{
+ if ((flags & (IF_ADMIN_DOWN | IF_TMP_DOWN)) ||
+ !(flags & IF_LINK_UP) ||
+ !i->addr)
+ flags &= ~IF_UP;
+ else
+ flags |= IF_UP;
+ return flags;
+}
+
+static void
+if_change_flags(struct iface *i, unsigned flags)
+{
+ unsigned of = i->flags;
+
+ i->flags = if_recalc_flags(i, flags);
+ if ((i->flags ^ of) & IF_UP)
+ if_notify_change((i->flags & IF_UP) ? IF_CHANGE_UP : IF_CHANGE_DOWN, i);
+}
+
+struct iface *
if_update(struct iface *new)
{
struct iface *i;
+ struct ifa *a, *b;
unsigned c;
- if ((new->flags & IF_LINK_UP) && !(new->flags & IF_ADMIN_DOWN) && ipa_nonzero(new->ip))
- new->flags |= IF_UP;
- else
- new->flags &= ~IF_UP;
-
WALK_LIST(i, iface_list)
if (!strcmp(new->name, i->name))
{
- if (if_change_too_big_p(i, new)) /* Changed a lot, convert it to down/up */
+ new->addr = i->addr;
+ new->flags = if_recalc_flags(new, new->flags);
+ c = if_what_changed(i, new);
+ if (c & IF_CHANGE_TOO_MUCH) /* Changed a lot, convert it to down/up */
{
DBG("Interface %s changed too much -- forcing down/up transition\n", i->name);
- if (i->flags & IF_UP)
- {
- struct iface j;
- memcpy(&j, i, sizeof(struct iface));
- i->flags &= ~IF_UP;
- if_notify_change(IF_CHANGE_DOWN | IF_CHANGE_FLAGS, &j, i, i);
- }
+ if_change_flags(i, i->flags | IF_TMP_DOWN);
rem_node(&i->n);
+ WALK_LIST_DELSAFE(a, b, i->addrs)
+ ifa_delete(a);
goto newif;
}
- c = if_changed(i, new);
- if (c)
- if_notify_change(c, i, new, i);
- if_copy(i, new); /* Even if c==0 as we might need to update i->index et al. */
+ else if (c)
+ {
+ if_copy(i, new);
+ if_notify_change(c, i);
+ }
i->flags |= IF_UPDATED;
- return;
+ return i;
}
-
i = mb_alloc(if_pool, sizeof(struct iface));
newif:
memcpy(i, new, sizeof(*i));
- i->flags |= IF_UPDATED;
+ init_list(&i->addrs);
+ i->flags |= IF_UPDATED | IF_TMP_DOWN; /* Tmp down as we don't have addresses yet */
add_tail(&iface_list, &i->n);
- if_notify_change(IF_CHANGE_CREATE | ((i->flags & IF_UP) ? IF_CHANGE_UP : 0)
- | IF_CHANGE_FLAGS | IF_CHANGE_MTU, NULL, i, i);
+ return i;
}
void
if_start_update(void)
{
struct iface *i;
+ struct ifa *a;
WALK_LIST(i, iface_list)
- i->flags &= ~IF_UPDATED;
+ {
+ i->flags &= ~IF_UPDATED;
+ WALK_LIST(a, i->addrs)
+ a->flags &= ~IF_UPDATED;
+ }
+}
+
+void
+if_end_partial_update(struct iface *i)
+{
+ if (i->flags & IF_TMP_DOWN)
+ if_change_flags(i, i->flags & ~IF_TMP_DOWN);
}
void
if_end_update(void)
{
struct iface *i, j;
+ struct ifa *a, *b;
if (!config->router_id)
auto_router_id();
WALK_LIST(i, iface_list)
- if (!(i->flags & IF_UPDATED))
- {
- memcpy(&j, i, sizeof(struct iface));
- i->flags = (i->flags & ~(IF_LINK_UP | IF_UP)) | IF_ADMIN_DOWN;
- if (i->flags != j.flags)
- if_notify_change(IF_CHANGE_DOWN | IF_CHANGE_FLAGS, &j, i, i);
- }
+ {
+ if (!(i->flags & IF_UPDATED))
+ if_change_flags(i, (i->flags & ~IF_LINK_UP) | IF_ADMIN_DOWN);
+ else
+ {
+ WALK_LIST_DELSAFE(a, b, i->addrs)
+ if (!(a->flags & IF_UPDATED))
+ ifa_delete(a);
+ if_end_partial_update(i);
+ }
+ }
}
void
if_feed_baby(struct proto *p)
{
struct iface *i;
+ struct ifa *a;
- if (!p->if_notify)
+ if (!p->if_notify && !p->ifa_notify)
return;
debug("Announcing interfaces to new protocol %s\n", p->name);
WALK_LIST(i, iface_list)
- p->if_notify(p, IF_CHANGE_CREATE | ((i->flags & IF_UP) ? IF_CHANGE_UP : 0), i, NULL);
+ {
+ if (p->if_notify)
+ p->if_notify(p, IF_CHANGE_CREATE | ((i->flags & IF_UP) ? IF_CHANGE_UP : 0), i);
+ if (p->ifa_notify && (i->flags & IF_UP))
+ WALK_LIST(a, i->addrs)
+ p->ifa_notify(p, IF_CHANGE_CREATE | IF_CHANGE_UP, a);
+ }
}
struct iface *
@@ -386,6 +456,96 @@ if_find_by_index(unsigned idx)
return NULL;
}
+struct iface *
+if_find_by_name(char *name)
+{
+ struct iface *i;
+
+ WALK_LIST(i, iface_list)
+ if (!strcmp(i->name, name))
+ return i;
+ return NULL;
+}
+
+static int
+ifa_recalc_primary(struct iface *i)
+{
+ struct ifa *a, *b = NULL;
+ int res;
+
+ WALK_LIST(a, i->addrs)
+ {
+ if (!(a->flags & IA_SECONDARY) && (!b || a->scope > b->scope))
+ b = a;
+ a->flags &= ~IA_PRIMARY;
+ }
+ res = (b != i->addr);
+ i->addr = b;
+ if (b)
+ {
+ b->flags |= IA_PRIMARY;
+ rem_node(&b->n);
+ add_head(&i->addrs, &b->n);
+ }
+ return res;
+}
+
+struct ifa *
+ifa_update(struct ifa *a)
+{
+ struct iface *i = a->iface;
+ struct ifa *b;
+
+ WALK_LIST(b, i->addrs)
+ if (ipa_equal(b->ip, a->ip))
+ {
+ if (ipa_equal(b->prefix, a->prefix) &&
+ b->pxlen == a->pxlen &&
+ ipa_equal(b->brd, a->brd) &&
+ ipa_equal(b->opposite, a->opposite) &&
+ b->scope == a->scope)
+ {
+ b->flags |= IF_UPDATED;
+ return b;
+ }
+ ifa_delete(b);
+ break;
+ }
+ b = mb_alloc(if_pool, sizeof(struct ifa));
+ memcpy(b, a, sizeof(struct ifa));
+ add_tail(&i->addrs, &b->n);
+ b->flags = (i->flags & ~IA_FLAGS) | (a->flags & IA_FLAGS);
+ if ((!i->addr || i->addr->scope < b->scope) && ifa_recalc_primary(i))
+ if_change_flags(i, i->flags | IF_TMP_DOWN);
+ if (b->flags & IF_UP)
+ ifa_notify_change(IF_CHANGE_CREATE | IF_CHANGE_UP, b);
+ return b;
+}
+
+void
+ifa_delete(struct ifa *a)
+{
+ struct iface *i = a->iface;
+ struct ifa *b;
+
+ WALK_LIST(b, i->addrs)
+ if (ipa_equal(b->ip, a->ip))
+ {
+ rem_node(&b->n);
+ if (b->flags & IF_UP)
+ {
+ b->flags &= ~IF_UP;
+ ifa_notify_change(IF_CHANGE_DOWN, b);
+ }
+ if (b->flags & IA_PRIMARY)
+ {
+ if_change_flags(i, i->flags | IF_TMP_DOWN);
+ ifa_recalc_primary(i);
+ }
+ mb_free(b);
+ }
+}
+
static void
auto_router_id(void) /* FIXME: What if we run IPv6??? */
{
@@ -393,14 +553,15 @@ auto_router_id(void) /* FIXME: What if we run IPv6??? */
j = NULL;
WALK_LIST(i, iface_list)
- if ((i->flags & IF_UP) &&
- !(i->flags & (IF_UNNUMBERED | IF_IGNORE)) &&
- (!j || ipa_to_u32(i->ip) < ipa_to_u32(j->ip)))
+ if ((i->flags & IF_LINK_UP) &&
+ !(i->flags & (IF_UNNUMBERED | IF_IGNORE | IF_ADMIN_DOWN)) &&
+ i->addr &&
+ (!j || ipa_to_u32(i->addr->ip) < ipa_to_u32(j->addr->ip)))
j = i;
if (!j)
die("Cannot determine router ID (no suitable network interface found), please configure it manually");
- debug("Guessed router ID %I (%s)\n", j->ip, j->name);
- config->router_id = ipa_to_u32(j->ip);
+ debug("Guessed router ID %I (%s)\n", j->addr->ip, j->name);
+ config->router_id = ipa_to_u32(j->addr->ip);
}
void
diff --git a/nest/iface.h b/nest/iface.h
index 8677be0..1d26e7b 100644
--- a/nest/iface.h
+++ b/nest/iface.h
@@ -15,48 +15,69 @@ extern list iface_list;
struct proto;
+struct ifa { /* Interface address */
+ node n;
+ struct iface *iface; /* Interface this address belongs to */
+ ip_addr ip; /* IP address of this host */
+ ip_addr prefix; /* Network prefix */
+ unsigned pxlen; /* Prefix length */
+ ip_addr brd; /* Broadcast address */
+ ip_addr opposite; /* Opposite end of a point-to-point link */
+ unsigned scope; /* Interface address scope */
+ unsigned flags; /* Analogous to iface->flags */
+};
+
struct iface {
node n;
char name[16];
unsigned flags;
unsigned mtu;
unsigned index; /* OS-dependent interface index */
- ip_addr ip; /* IP address of this host (0=unset) */
- ip_addr prefix; /* Network prefix */
- unsigned pxlen; /* Prefix length */
- ip_addr brd; /* Broadcast address */
- ip_addr opposite; /* Opposite end of a point-to-point link */
+ list addrs; /* Addresses assigned to this interface */
+ struct ifa *addr; /* Primary address */
struct neighbor *neigh; /* List of neighbors on this interface */
};
-#define IF_UP 1 /* IF_LINK_UP, not IF_IGNORE and IP address known */
+#define IF_UP 1 /* IF_LINK_UP and IP address known */
#define IF_MULTIACCESS 2
#define IF_UNNUMBERED 4
#define IF_BROADCAST 8
-#define IF_MULTICAST 16
-#define IF_TUNNEL 32
-#define IF_ADMIN_DOWN 64
-#define IF_LOOPBACK 128
-#define IF_IGNORE 256
-#define IF_LINK_UP 512
+#define IF_MULTICAST 0x10
+#define IF_TUNNEL 0x20
+#define IF_ADMIN_DOWN 0x40
+#define IF_LOOPBACK 0x80
+#define IF_IGNORE 0x100 /* Not to be used by routing protocols (loopbacks etc.) */
+#define IF_LINK_UP 0x200
+
+#define IA_PRIMARY 0x10000 /* This address is primary */
+#define IA_SECONDARY 0x20000 /* This address has been reported as secondary by the kernel */
+#define IA_FLAGS 0xff0000
+
+#define IF_JUST_CREATED 0x10000000 /* Send creation event as soon as possible */
+#define IF_TMP_DOWN 0x20000000 /* Temporary shutdown due to interface reconfiguration */
#define IF_UPDATED 0x40000000 /* Touched in last scan */
/* Interface change events */
#define IF_CHANGE_UP 1
#define IF_CHANGE_DOWN 2
-#define IF_CHANGE_FLAGS 4 /* Can be converted to down/up internally */
-#define IF_CHANGE_MTU 8
-#define IF_CHANGE_CREATE 16 /* Seen this interface for the first time */
+#define IF_CHANGE_MTU 4
+#define IF_CHANGE_CREATE 8 /* Seen this interface for the first time */
+#define IF_CHANGE_TOO_MUCH 0x40000000 /* Used internally */
void if_init(void);
void if_dump(struct iface *);
void if_dump_all(void);
-void if_update(struct iface *);
+void ifa_dump(struct ifa *);
+struct iface *if_update(struct iface *);
+struct ifa *ifa_update(struct ifa *);
+void ifa_delete(struct ifa *);
void if_start_update(void);
void if_end_update(void);
+void if_end_partial_update(struct iface *);
void if_feed_baby(struct proto *);
struct iface *if_find_by_index(unsigned);
+struct iface *if_find_by_name(char *);
/*
* Neighbor Cache. We hold (direct neighbor, protocol) pairs we've seen
diff --git a/nest/protocol.h b/nest/protocol.h
index c203f25..5e1e2ce 100644
--- a/nest/protocol.h
+++ b/nest/protocol.h
@@ -13,6 +13,7 @@
#include "lib/resource.h"
struct iface;
+struct ifa;
struct rte;
struct neighbor;
struct rta;
@@ -96,6 +97,7 @@ struct proto {
* General protocol hooks:
*
* if_notify Notify protocol about interface state changes.
+ * ifa_notify Notify protocol about interface address changes.
* rt_notify Notify protocol about routing table updates.
* neigh_notify Notify protocol about neighbor cache events.
* make_tmp_attrs Construct ea_list from private attrs stored in rte.
@@ -106,7 +108,8 @@ struct proto {
* 0=process it through the import filter set by the user.
*/
- void (*if_notify)(struct proto *, unsigned flags, struct iface *new, struct iface *old);
+ void (*if_notify)(struct proto *, unsigned flags, struct iface *i);
+ void (*ifa_notify)(struct proto *, unsigned flags, struct ifa *a);
void (*rt_notify)(struct proto *, struct network *net, struct rte *new, struct rte *old);
void (*neigh_notify)(struct neighbor *neigh);
struct ea_list *(*make_tmp_attrs)(struct rte *rt, struct linpool *pool);
diff --git a/nest/rt-dev.c b/nest/rt-dev.c
index d6035f5..1225f1d 100644
--- a/nest/rt-dev.c
+++ b/nest/rt-dev.c
@@ -19,19 +19,18 @@
#include "lib/resource.h"
static void
-dev_if_notify(struct proto *p, unsigned c, struct iface *new, struct iface *old)
+dev_ifa_notify(struct proto *p, unsigned c, struct ifa *ad)
{
struct rt_dev_config *P = (void *) p->cf;
- if (old && !iface_patt_match(&P->iface_list, old) ||
- new && !iface_patt_match(&P->iface_list, new))
+ if (!iface_patt_match(&P->iface_list, ad->iface))
return;
if (c & IF_CHANGE_DOWN)
{
net *n;
- debug("dev_if_notify: %s going down\n", old->name);
- n = net_find(p->table, old->prefix, old->pxlen);
+ DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip);
+ n = net_find(p->table, ad->prefix, ad->pxlen);
if (!n)
{
debug("dev_if_notify: device shutdown: prefix not found\n");
@@ -45,20 +44,20 @@ dev_if_notify(struct proto *p, unsigned c, struct iface *new, struct iface *old)
net *n;
rte *e;
- debug("dev_if_notify: %s going up\n", new->name);
+ debug("dev_if_notify: %s:%I going up\n", ad->iface->name, ad->ip);
bzero(&A, sizeof(A));
A.proto = p;
A.source = RTS_DEVICE;
- A.scope = (new->flags & IF_LOOPBACK) ? SCOPE_HOST : SCOPE_UNIVERSE;
+ A.scope = ad->scope;
A.cast = RTC_UNICAST;
A.dest = RTD_DEVICE;
- A.iface = new;
+ A.iface = ad->iface;
A.attrs = NULL;
a = rta_lookup(&A);
- if (new->flags & IF_UNNUMBERED)
- n = net_get(p->table, new->opposite, new->pxlen);
+ if (ad->flags & IF_UNNUMBERED)
+ n = net_get(p->table, ad->opposite, ad->pxlen);
else
- n = net_get(p->table, new->prefix, new->pxlen);
+ n = net_get(p->table, ad->prefix, ad->pxlen);
e = rte_get_temp(a);
e->net = n;
e->pflags = 0;
@@ -71,7 +70,7 @@ dev_init(struct proto_config *c)
{
struct proto *p = proto_new(c, sizeof(struct proto));
- p->if_notify = dev_if_notify;
+ p->ifa_notify = dev_ifa_notify;
return p;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-19 07:23:13 +0100