Implemented scanning of network interfaces. Mostly very ugly code due to
terrible kernel interface (SIOGIFCONF and friends).
This commit is contained in:
Martin Mares
parent
b1487ee909
commit
8a48ecb8b1
6 changed files with 386 additions and 21 deletions
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@ -1,4 +1,4 @@
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THISDIR=nest
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OBJS=rt-table.o rt-fib.o rt-attr.o proto.o
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OBJS=rt-table.o rt-fib.o rt-attr.o proto.o iface.o
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include ../Rules
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177
nest/iface.c
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177
nest/iface.c
Normal file
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@ -0,0 +1,177 @@
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/*
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* BIRD -- Management of Interfaces
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*
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* (c) 1998 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include "nest/bird.h"
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#include "nest/iface.h"
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#include "lib/resource.h"
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list iface_list;
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static pool *if_pool;
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void
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if_dump(struct iface *i)
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{
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struct ifa *a;
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debug("IF%d: %s", i->index, i->name);
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if (i->flags & IF_ADMIN_DOWN)
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debug(" ADMIN-DOWN");
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if (i->flags & IF_UP)
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debug(" UP");
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if (i->flags & IF_MULTIACCESS)
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debug(" MA");
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if (i->flags & IF_UNNUMBERED)
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debug(" UNNUM");
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if (i->flags & IF_BROADCAST)
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debug(" BC");
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if (i->flags & IF_MULTICAST)
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debug(" MC");
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if (i->flags & IF_TUNNEL)
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debug(" TUNL");
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if (i->flags & IF_LOOPBACK)
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debug(" LOOP");
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if (i->flags & IF_IGNORE)
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debug(" IGN");
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debug(" MTU=%d\n", i->mtu);
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for(a=i->ifa; a; a=a->next)
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debug("\t%08x, net %08x/%-2d bc %08x -> %08x\n", _I(a->ip), _I(a->prefix), a->pxlen, _I(a->brd), _I(a->opposite));
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}
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void
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if_dump_all(void)
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{
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struct iface *i;
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debug("Known network interfaces:\n\n");
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WALK_LIST(i, iface_list)
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if_dump(i);
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debug("\n");
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}
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struct if_with_a {
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struct iface i;
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struct ifa a[0];
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};
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static struct iface *
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if_copy(struct iface *j)
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{
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int len;
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struct if_with_a *w;
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struct iface *i;
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struct ifa *a, **b, *c;
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len = 0;
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for(a=j->ifa; a; a=a->next)
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len++;
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w = mb_alloc(if_pool, sizeof(struct if_with_a) + len*sizeof(struct ifa));
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i = &w->i;
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c = w->a;
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memcpy(i, j, sizeof(struct iface));
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b = &i->ifa;
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a = j->ifa;
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while (a)
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{
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*b = c;
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memcpy(c, a, sizeof(struct ifa));
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b = &c->next;
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a = a->next;
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c++;
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}
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*b = NULL;
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return i;
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}
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static inline void
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if_free(struct iface *i)
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{
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mb_free(i);
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}
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static unsigned
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if_changed(struct iface *i, struct iface *j)
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{
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unsigned f = 0;
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struct ifa *x, *y;
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x = i->ifa;
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y = j->ifa;
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while (x && y)
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{
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x = x->next;
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y = y->next;
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}
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if (x || y)
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f |= IF_CHANGE_ADDR;
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if (i->mtu != j->mtu)
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f |= IF_CHANGE_MTU;
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if (i->flags != j->flags)
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{
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f |= IF_CHANGE_FLAGS;
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if ((i->flags ^ j->flags) & IF_UP)
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if (i->flags & IF_UP)
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f |= IF_CHANGE_DOWN;
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else
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f |= IF_CHANGE_UP;
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}
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return f;
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}
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static void
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if_notify_change(unsigned c, struct iface *old, struct iface *new)
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{
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debug("Interface change notification (%x) for %s\n", c, new->name);
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}
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void
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if_update(struct iface *new)
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{
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struct iface *i;
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WALK_LIST(i, iface_list)
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if (!strcmp(new->name, i->name))
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{
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unsigned c = if_changed(i, new);
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if (c)
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{
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struct iface *j = if_copy(new);
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if_notify_change(c, i, j);
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insert_node(&j->n, &i->n);
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rem_node(&i->n);
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if_free(i);
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}
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return;
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}
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i = if_copy(new);
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add_tail(&iface_list, &i->n);
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if_notify_change(IF_CHANGE_UP | IF_CHANGE_FLAGS | IF_CHANGE_MTU | IF_CHANGE_ADDR, NULL, i);
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}
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void
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if_end_update(void)
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{
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struct iface *i, j;
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WALK_LIST(i, iface_list)
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if (i->flags & IF_UPDATED)
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i->flags &= ~IF_UPDATED;
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else
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{
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memcpy(&j, i, sizeof(struct iface));
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i->flags = (i->flags & ~IF_UP) | IF_ADMIN_DOWN;
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if_notify_change(IF_CHANGE_DOWN | IF_CHANGE_FLAGS, &j, i);
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}
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}
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void
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if_init(void)
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{
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if_pool = rp_new(&root_pool, "Interfaces");
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init_list(&iface_list);
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}
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22
nest/iface.h
22
nest/iface.h
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@ -11,9 +11,11 @@
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#include "lib/lists.h"
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extern list iface_list;
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struct iface {
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node n;
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char *name;
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char name[16];
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unsigned flags;
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unsigned mtu;
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struct ifa *ifa; /* First address is primary */
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@ -26,6 +28,10 @@ struct iface {
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#define IF_BROADCAST 8
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#define IF_MULTICAST 16
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#define IF_TUNNEL 32
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#define IF_ADMIN_DOWN 64
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#define IF_LOOPBACK 128
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#define IF_IGNORE 256
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#define IF_UPDATED 0x1000 /* Touched in last scan */
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/* Interface address */
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@ -39,4 +45,18 @@ struct ifa {
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struct neighbor *neigh; /* List of neighbors on this interface */
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};
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/* Interface change events */
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#define IF_CHANGE_UP 1
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#define IF_CHANGE_DOWN 2
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#define IF_CHANGE_FLAGS 4
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#define IF_CHANGE_MTU 8
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#define IF_CHANGE_ADDR 16
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void if_init(void);
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void if_dump(struct iface *);
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void if_dump_all(void);
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void if_update(struct iface *);
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void if_end_update(void);
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#endif
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@ -3,3 +3,4 @@ main.c
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timer.h
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io.c
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unix.h
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sync-if.c
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@ -15,6 +15,7 @@
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#include "lib/socket.h"
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#include "nest/route.h"
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#include "nest/protocol.h"
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#include "nest/iface.h"
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#include "unix.h"
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@ -29,6 +30,7 @@ handle_sigusr(int sig)
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sk_dump_all();
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tm_dump_all();
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if_dump_all();
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rta_dump_all();
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rt_dump_all();
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resource_init();
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io_init();
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rt_init();
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if_init();
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protos_init();
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scan_if_init();
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signal_init();
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{
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sock *s = sk_new(&root_pool);
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handle_sigusr(0);
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if (!s)
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die("no socket");
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s->type = SK_UDP_MC;
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s->sport = 7899;
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s->saddr = _MI(0x3ea80015);
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s->daddr = _MI(0xe0000001);
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s->dport = 7890;
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s->rx_hook = xxx;
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s->tx_hook = bla;
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s->err_hook = erro;
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s->rbsize = 1024;
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s->tbsize = 1024;
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s->ttl = 1;
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if (sk_open(s))
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die("open failed");
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bla(s);
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}
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debug("Entering I/O loop.\n");
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io_loop();
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die("I/O loop died");
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178
sysdep/unix/sync-if.c
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178
sysdep/unix/sync-if.c
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@ -0,0 +1,178 @@
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/*
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* BIRD -- Unix Interface Scanning and Syncing
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*
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* (c) 1998 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include <string.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#define LOCAL_DEBUG
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#include "nest/bird.h"
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#include "nest/iface.h"
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#include "lib/timer.h"
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#include "unix.h"
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int if_scan_sock;
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int if_scan_period = 60;
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static timer *if_scan_timer;
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static void
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scan_ifs(struct ifreq *r, int cnt)
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{
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struct iface i;
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struct ifa a;
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char *err;
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unsigned fl;
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ip_addr netmask;
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int l;
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for (cnt /= sizeof(struct ifreq); cnt; cnt--, r++)
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{
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bzero(&i, sizeof(i));
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bzero(&a, sizeof(a));
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debug("%s\n", r->ifr_ifrn.ifrn_name);
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strncpy(i.name, r->ifr_ifrn.ifrn_name, sizeof(i.name) - 1);
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i.name[sizeof(i.name) - 1] = 0;
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i.ifa = &a;
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get_sockaddr((struct sockaddr_in *) &r->ifr_addr, &a.ip, NULL);
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l = ipa_classify(a.ip);
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if (l < 0 || !(l & IADDR_HOST))
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{
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log(L_ERR "%s: Invalid interface address", i.name);
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goto bad;
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}
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if ((l & IADDR_SCOPE_MASK) == SCOPE_HOST)
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i.flags |= IF_LOOPBACK | IF_IGNORE;
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if (ioctl(if_scan_sock, SIOCGIFFLAGS, r) < 0)
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{
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err = "SIOCGIFFLAGS";
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faulty:
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log(L_ERR "%s(%s): %m", err, i.name);
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bad:
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i.flags = (i.flags & ~IF_UP) | IF_ADMIN_DOWN;
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continue;
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}
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fl = r->ifr_flags;
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if (fl & IFF_UP)
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i.flags |= IF_UP;
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if (ioctl(if_scan_sock, SIOCGIFNETMASK, r) < 0)
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{ err = "SIOCGIFNETMASK"; goto faulty; }
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get_sockaddr((struct sockaddr_in *) &r->ifr_addr, &netmask, NULL);
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l = ipa_mklen(netmask);
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if (l < 0 || l == 31)
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{
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log(L_ERR "%s: Invalid netmask", i.name);
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goto bad;
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}
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a.pxlen = l;
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if (fl & IFF_POINTOPOINT)
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{
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i.flags |= IF_UNNUMBERED;
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a.pxlen = BITS_PER_IP_ADDRESS;
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if (ioctl(if_scan_sock, SIOCGIFDSTADDR, r) < 0)
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{ err = "SIOCGIFDSTADDR"; goto faulty; }
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get_sockaddr((struct sockaddr_in *) &r->ifr_addr, &a.opposite, NULL);
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}
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if (fl & IFF_LOOPBACK)
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i.flags |= IF_LOOPBACK | IF_IGNORE;
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#ifndef CONFIG_ALL_MULTICAST
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if (fl & IFF_MULTICAST)
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#endif
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i.flags |= IF_MULTICAST;
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a.prefix = ipa_and(a.ip, ipa_mkmask(a.pxlen));
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if (a.pxlen < 32)
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{
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a.brd = ipa_or(a.prefix, ipa_not(ipa_mkmask(a.pxlen)));
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if (ipa_equal(a.ip, a.prefix) || ipa_equal(a.ip, a.brd))
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{
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log(L_ERR "%s: Using network or broadcast address for interface", i.name);
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goto bad;
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}
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if (fl & IFF_BROADCAST)
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i.flags |= IF_BROADCAST;
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if (a.pxlen < 30)
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i.flags |= IF_MULTIACCESS;
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else
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a.opposite = ipa_opposite(a.ip);
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}
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else
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a.brd = a.opposite;
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if (ioctl(if_scan_sock, SIOCGIFMTU, r) < 0)
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{ err = "SIOCGIFMTU"; goto faulty; }
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i.mtu = r->ifr_mtu;
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#ifdef SIOCGIFINDEX
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if (ioctl(if_scan_sock, SIOCGIFINDEX, r) < 0)
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{ err = "SIOCGIFINDEX"; goto faulty; }
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i.index = r->ifr_ifindex;
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#endif
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if_update(&i);
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}
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}
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static void
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scan_if(timer *t)
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{
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struct ifconf ic;
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static int last_ifbuf_size;
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int res;
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DBG("Scanning interfaces...\n");
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for(;;)
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{
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if (last_ifbuf_size)
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{
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struct ifreq *r = alloca(last_ifbuf_size);
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ic.ifc_ifcu.ifcu_req = r;
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ic.ifc_len = last_ifbuf_size;
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res = ioctl(if_scan_sock, SIOCGIFCONF, &ic);
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if (res < 0 && errno != EFAULT)
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die("SIOCCGIFCONF: %m");
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if (res < last_ifbuf_size)
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{
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scan_ifs(r, ic.ifc_len);
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break;
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}
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}
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ic.ifc_ifcu.ifcu_req = NULL;
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if (ioctl(if_scan_sock, SIOCGIFCONF, &ic) < 0)
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die("SIOCIFCONF: %m");
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ic.ifc_len += sizeof(struct ifreq);
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if (last_ifbuf_size < ic.ifc_len)
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{
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last_ifbuf_size = ic.ifc_len;
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DBG("Increased ifconf buffer size to %d\n", last_ifbuf_size);
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}
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}
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}
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void
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scan_if_init(void)
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{
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if_scan_sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
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DBG("Using socket %d for interface and route scanning\n", if_scan_sock);
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if (if_scan_sock < 0)
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die("Cannot create scanning socket: %m");
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scan_if(NULL);
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if_scan_timer = tm_new(&root_pool);
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if_scan_timer->hook = scan_if;
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if_scan_timer->recurrent = if_scan_period;
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tm_start(if_scan_timer, if_scan_period);
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}
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