summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--include/uapi/linux/rtnetlink.h8
-rw-r--r--net/mpls/af_mpls.c229
2 files changed, 237 insertions, 0 deletions
diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index 5cc5d66bf519..bad65550ae3e 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -303,6 +303,8 @@ enum rtattr_type_t {
RTA_TABLE,
RTA_MARK,
RTA_MFC_STATS,
+ RTA_VIA,
+ RTA_NEWDST,
__RTA_MAX
};
@@ -344,6 +346,12 @@ struct rtnexthop {
#define RTNH_SPACE(len) RTNH_ALIGN(RTNH_LENGTH(len))
#define RTNH_DATA(rtnh) ((struct rtattr*)(((char*)(rtnh)) + RTNH_LENGTH(0)))
+/* RTA_VIA */
+struct rtvia {
+ __kernel_sa_family_t rtvia_family;
+ __u8 rtvia_addr[0];
+};
+
/* RTM_CACHEINFO */
struct rta_cacheinfo {
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 2d6612a10e30..b4d7cec398d2 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -212,6 +212,11 @@ static struct packet_type mpls_packet_type __read_mostly = {
.func = mpls_forward,
};
+const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = {
+ [RTA_DST] = { .type = NLA_U32 },
+ [RTA_OIF] = { .type = NLA_U32 },
+};
+
struct mpls_route_config {
u32 rc_protocol;
u32 rc_ifindex;
@@ -410,6 +415,22 @@ static struct notifier_block mpls_dev_notifier = {
.notifier_call = mpls_dev_notify,
};
+static int nla_put_via(struct sk_buff *skb,
+ u16 family, const void *addr, int alen)
+{
+ struct nlattr *nla;
+ struct rtvia *via;
+
+ nla = nla_reserve(skb, RTA_VIA, alen + 2);
+ if (!nla)
+ return -EMSGSIZE;
+
+ via = nla_data(nla);
+ via->rtvia_family = family;
+ memcpy(via->rtvia_addr, addr, alen);
+ return 0;
+}
+
int nla_put_labels(struct sk_buff *skb, int attrtype,
u8 labels, const u32 label[])
{
@@ -467,6 +488,210 @@ int nla_get_labels(const struct nlattr *nla,
return 0;
}
+static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct mpls_route_config *cfg)
+{
+ struct rtmsg *rtm;
+ struct nlattr *tb[RTA_MAX+1];
+ int index;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy);
+ if (err < 0)
+ goto errout;
+
+ err = -EINVAL;
+ rtm = nlmsg_data(nlh);
+ memset(cfg, 0, sizeof(*cfg));
+
+ if (rtm->rtm_family != AF_MPLS)
+ goto errout;
+ if (rtm->rtm_dst_len != 20)
+ goto errout;
+ if (rtm->rtm_src_len != 0)
+ goto errout;
+ if (rtm->rtm_tos != 0)
+ goto errout;
+ if (rtm->rtm_table != RT_TABLE_MAIN)
+ goto errout;
+ /* Any value is acceptable for rtm_protocol */
+
+ /* As mpls uses destination specific addresses
+ * (or source specific address in the case of multicast)
+ * all addresses have universal scope.
+ */
+ if (rtm->rtm_scope != RT_SCOPE_UNIVERSE)
+ goto errout;
+ if (rtm->rtm_type != RTN_UNICAST)
+ goto errout;
+ if (rtm->rtm_flags != 0)
+ goto errout;
+
+ cfg->rc_label = LABEL_NOT_SPECIFIED;
+ cfg->rc_protocol = rtm->rtm_protocol;
+ cfg->rc_nlflags = nlh->nlmsg_flags;
+ cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid;
+ cfg->rc_nlinfo.nlh = nlh;
+ cfg->rc_nlinfo.nl_net = sock_net(skb->sk);
+
+ for (index = 0; index <= RTA_MAX; index++) {
+ struct nlattr *nla = tb[index];
+ if (!nla)
+ continue;
+
+ switch(index) {
+ case RTA_OIF:
+ cfg->rc_ifindex = nla_get_u32(nla);
+ break;
+ case RTA_NEWDST:
+ if (nla_get_labels(nla, MAX_NEW_LABELS,
+ &cfg->rc_output_labels,
+ cfg->rc_output_label))
+ goto errout;
+ break;
+ case RTA_DST:
+ {
+ u32 label_count;
+ if (nla_get_labels(nla, 1, &label_count,
+ &cfg->rc_label))
+ goto errout;
+
+ /* The first 16 labels are reserved, and may not be set */
+ if (cfg->rc_label < 16)
+ goto errout;
+
+ break;
+ }
+ case RTA_VIA:
+ {
+ struct rtvia *via = nla_data(nla);
+ cfg->rc_via_family = via->rtvia_family;
+ cfg->rc_via_alen = nla_len(nla) - 2;
+ if (cfg->rc_via_alen > MAX_VIA_ALEN)
+ goto errout;
+
+ /* Validate the address family */
+ switch(cfg->rc_via_family) {
+ case AF_PACKET:
+ break;
+ case AF_INET:
+ if (cfg->rc_via_alen != 4)
+ goto errout;
+ break;
+ case AF_INET6:
+ if (cfg->rc_via_alen != 16)
+ goto errout;
+ break;
+ default:
+ /* Unsupported address family */
+ goto errout;
+ }
+
+ memcpy(cfg->rc_via, via->rtvia_addr, cfg->rc_via_alen);
+ break;
+ }
+ default:
+ /* Unsupported attribute */
+ goto errout;
+ }
+ }
+
+ err = 0;
+errout:
+ return err;
+}
+
+static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ struct mpls_route_config cfg;
+ int err;
+
+ err = rtm_to_route_config(skb, nlh, &cfg);
+ if (err < 0)
+ return err;
+
+ return mpls_route_del(&cfg);
+}
+
+
+static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ struct mpls_route_config cfg;
+ int err;
+
+ err = rtm_to_route_config(skb, nlh, &cfg);
+ if (err < 0)
+ return err;
+
+ return mpls_route_add(&cfg);
+}
+
+static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
+ u32 label, struct mpls_route *rt, int flags)
+{
+ struct nlmsghdr *nlh;
+ struct rtmsg *rtm;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
+ if (nlh == NULL)
+ return -EMSGSIZE;
+
+ rtm = nlmsg_data(nlh);
+ rtm->rtm_family = AF_MPLS;
+ rtm->rtm_dst_len = 20;
+ rtm->rtm_src_len = 0;
+ rtm->rtm_tos = 0;
+ rtm->rtm_table = RT_TABLE_MAIN;
+ rtm->rtm_protocol = rt->rt_protocol;
+ rtm->rtm_scope = RT_SCOPE_UNIVERSE;
+ rtm->rtm_type = RTN_UNICAST;
+ rtm->rtm_flags = 0;
+
+ if (rt->rt_labels &&
+ nla_put_labels(skb, RTA_NEWDST, rt->rt_labels, rt->rt_label))
+ goto nla_put_failure;
+ if (nla_put_via(skb, rt->rt_via_family, rt->rt_via, rt->rt_via_alen))
+ goto nla_put_failure;
+ if (rt->rt_dev && nla_put_u32(skb, RTA_OIF, rt->rt_dev->ifindex))
+ goto nla_put_failure;
+ if (nla_put_labels(skb, RTA_DST, 1, &label))
+ goto nla_put_failure;
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ unsigned int index;
+
+ ASSERT_RTNL();
+
+ index = cb->args[0];
+ if (index < 16)
+ index = 16;
+
+ for (; index < net->mpls.platform_labels; index++) {
+ struct mpls_route *rt;
+ rt = net->mpls.platform_label[index];
+ if (!rt)
+ continue;
+
+ if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, RTM_NEWROUTE,
+ index, rt, NLM_F_MULTI) < 0)
+ break;
+ }
+ cb->args[0] = index;
+
+ return skb->len;
+}
+
static int resize_platform_label_table(struct net *net, size_t limit)
{
size_t size = sizeof(struct mpls_route *) * limit;
@@ -662,6 +887,9 @@ static int __init mpls_init(void)
dev_add_pack(&mpls_packet_type);
+ rtnl_register(PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, NULL);
+ rtnl_register(PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, NULL);
+ rtnl_register(PF_MPLS, RTM_GETROUTE, NULL, mpls_dump_routes, NULL);
err = 0;
out:
return err;
@@ -674,6 +902,7 @@ module_init(mpls_init);
static void __exit mpls_exit(void)
{
+ rtnl_unregister_all(PF_MPLS);
dev_remove_pack(&mpls_packet_type);
unregister_netdevice_notifier(&mpls_dev_notifier);
unregister_pernet_subsys(&mpls_net_ops);
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-29 09:16:57 +0000