Annotation of embedaddon/bird2/nest/rt-dev.c, revision 1.1
1.1 ! misho 1: /*
! 2: * BIRD -- Direct Device Routes
! 3: *
! 4: * (c) 1998--2000 Martin Mares <mj@ucw.cz>
! 5: *
! 6: * Can be freely distributed and used under the terms of the GNU GPL.
! 7: */
! 8:
! 9: /**
! 10: * DOC: Direct
! 11: *
! 12: * The Direct protocol works by converting all ifa_notify() events it receives
! 13: * to rte_update() calls for the corresponding network.
! 14: */
! 15:
! 16: #undef LOCAL_DEBUG
! 17:
! 18: #include "nest/bird.h"
! 19: #include "nest/iface.h"
! 20: #include "nest/protocol.h"
! 21: #include "nest/route.h"
! 22: #include "nest/rt-dev.h"
! 23: #include "conf/conf.h"
! 24: #include "lib/resource.h"
! 25: #include "lib/string.h"
! 26:
! 27:
! 28: static void
! 29: dev_ifa_notify(struct proto *P, uint flags, struct ifa *ad)
! 30: {
! 31: struct rt_dev_proto *p = (void *) P;
! 32: struct rt_dev_config *cf = (void *) P->cf;
! 33: struct channel *c;
! 34: net_addr *net = &ad->prefix;
! 35:
! 36: if (!EMPTY_LIST(cf->iface_list) &&
! 37: !iface_patt_find(&cf->iface_list, ad->iface, ad))
! 38: /* Empty list is automatically treated as "*" */
! 39: return;
! 40:
! 41: if (ad->flags & IA_SECONDARY)
! 42: return;
! 43:
! 44: if (ad->scope <= SCOPE_LINK)
! 45: return;
! 46:
! 47: if (ad->prefix.type == NET_IP4)
! 48: c = p->ip4_channel;
! 49: else if (ad->prefix.type == NET_IP6)
! 50: c = p->ip6_channel;
! 51: else
! 52: return;
! 53:
! 54: if (!c)
! 55: return;
! 56:
! 57: /* For IPv6 SADR, replace regular prefix with SADR prefix */
! 58: if (c->net_type == NET_IP6_SADR)
! 59: {
! 60: net = alloca(sizeof(net_addr_ip6_sadr));
! 61: net_fill_ip6_sadr(net, net6_prefix(&ad->prefix), net6_pxlen(&ad->prefix), IP6_NONE, 0);
! 62: }
! 63:
! 64: if (flags & IF_CHANGE_DOWN)
! 65: {
! 66: DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip);
! 67:
! 68: /* Use iface ID as local source ID */
! 69: struct rte_src *src = rt_get_source(P, ad->iface->index);
! 70: rte_update2(c, net, NULL, src);
! 71: }
! 72: else if (flags & IF_CHANGE_UP)
! 73: {
! 74: rta *a;
! 75: rte *e;
! 76:
! 77: DBG("dev_if_notify: %s:%I going up\n", ad->iface->name, ad->ip);
! 78:
! 79: if (cf->check_link && !(ad->iface->flags & IF_LINK_UP))
! 80: return;
! 81:
! 82: /* Use iface ID as local source ID */
! 83: struct rte_src *src = rt_get_source(P, ad->iface->index);
! 84:
! 85: rta a0 = {
! 86: .src = src,
! 87: .source = RTS_DEVICE,
! 88: .scope = SCOPE_UNIVERSE,
! 89: .dest = RTD_UNICAST,
! 90: .nh.iface = ad->iface,
! 91: };
! 92:
! 93: a = rta_lookup(&a0);
! 94: e = rte_get_temp(a);
! 95: e->pflags = 0;
! 96: rte_update2(c, net, e, src);
! 97: }
! 98: }
! 99:
! 100: static void
! 101: dev_if_notify(struct proto *p, uint c, struct iface *iface)
! 102: {
! 103: struct rt_dev_config *cf = (void *) p->cf;
! 104:
! 105: if (c & (IF_CHANGE_UP | IF_CHANGE_DOWN))
! 106: return;
! 107:
! 108: if ((c & IF_CHANGE_LINK) && cf->check_link)
! 109: {
! 110: uint ac = (iface->flags & IF_LINK_UP) ? IF_CHANGE_UP : IF_CHANGE_DOWN;
! 111:
! 112: struct ifa *a;
! 113: WALK_LIST(a, iface->addrs)
! 114: dev_ifa_notify(p, ac, a);
! 115: }
! 116: }
! 117:
! 118: static void
! 119: dev_postconfig(struct proto_config *CF)
! 120: {
! 121: struct rt_dev_config *cf = (void *) CF;
! 122: struct channel_config *ip4, *ip6, *ip6_sadr;
! 123:
! 124: ip4 = proto_cf_find_channel(CF, NET_IP4);
! 125: ip6 = proto_cf_find_channel(CF, NET_IP6);
! 126: ip6_sadr = proto_cf_find_channel(CF, NET_IP6_SADR);
! 127:
! 128: if (ip6 && ip6_sadr)
! 129: cf_error("Both ipv6 and ipv6-sadr channels");
! 130:
! 131: cf->ip4_channel = ip4;
! 132: cf->ip6_channel = ip6 ?: ip6_sadr;
! 133: }
! 134:
! 135: static struct proto *
! 136: dev_init(struct proto_config *CF)
! 137: {
! 138: struct proto *P = proto_new(CF);
! 139: struct rt_dev_proto *p = (void *) P;
! 140: struct rt_dev_config *cf = (void *) CF;
! 141:
! 142: proto_configure_channel(P, &p->ip4_channel, cf->ip4_channel);
! 143: proto_configure_channel(P, &p->ip6_channel, cf->ip6_channel);
! 144:
! 145: P->if_notify = dev_if_notify;
! 146: P->ifa_notify = dev_ifa_notify;
! 147:
! 148: return P;
! 149: }
! 150:
! 151: static int
! 152: dev_reconfigure(struct proto *P, struct proto_config *CF)
! 153: {
! 154: struct rt_dev_proto *p = (void *) P;
! 155: struct rt_dev_config *o = (void *) P->cf;
! 156: struct rt_dev_config *n = (void *) CF;
! 157:
! 158: if (!iface_patts_equal(&o->iface_list, &n->iface_list, NULL) ||
! 159: (o->check_link != n->check_link))
! 160: return 0;
! 161:
! 162: return
! 163: proto_configure_channel(P, &p->ip4_channel, n->ip4_channel) &&
! 164: proto_configure_channel(P, &p->ip6_channel, n->ip6_channel);
! 165:
! 166: return 1;
! 167: }
! 168:
! 169: static void
! 170: dev_copy_config(struct proto_config *dest, struct proto_config *src)
! 171: {
! 172: struct rt_dev_config *d = (void *) dest;
! 173: struct rt_dev_config *s = (void *) src;
! 174:
! 175: /*
! 176: * We copy iface_list as ifaces can be shared by more direct protocols.
! 177: * Copy suffices to be is shallow, because new nodes can be added, but
! 178: * old nodes cannot be modified (although they contain internal lists).
! 179: */
! 180: cfg_copy_list(&d->iface_list, &s->iface_list, sizeof(struct iface_patt));
! 181:
! 182: d->check_link = s->check_link;
! 183: }
! 184:
! 185: struct protocol proto_device = {
! 186: .name = "Direct",
! 187: .template = "direct%d",
! 188: .class = PROTOCOL_DIRECT,
! 189: .preference = DEF_PREF_DIRECT,
! 190: .channel_mask = NB_IP | NB_IP6_SADR,
! 191: .proto_size = sizeof(struct rt_dev_proto),
! 192: .config_size = sizeof(struct rt_dev_config),
! 193: .postconfig = dev_postconfig,
! 194: .init = dev_init,
! 195: .reconfigure = dev_reconfigure,
! 196: .copy_config = dev_copy_config
! 197: };
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