From 52dfae5c85a4c1078e9f1d5e8947d4a25f73dd81 Mon Sep 17 00:00:00 2001 From: Jon Maloy Date: Thu, 22 Mar 2018 20:42:52 +0100 Subject: [PATCH] tipc: obtain node identity from interface by default Selecting and explicitly configuring a TIPC node identity may be unwanted in some cases. In this commit we introduce a default setting if the identity has not been set at the moment the first bearer is enabled. We do this by using a raw copy of a unique identifier from the used interface: MAC address in the case of an L2 bearer, IPv4/IPv6 address in the case of a UDP bearer. Acked-by: Ying Xue Signed-off-by: Jon Maloy Signed-off-by: David S. Miller --- net/tipc/bearer.c | 24 +++++++++++++++--------- net/tipc/net.h | 1 + net/tipc/udp_media.c | 13 +++++++++++++ 3 files changed, 29 insertions(+), 9 deletions(-) diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c index ae5b44ca1c1e..f7d47c89d658 100644 --- a/net/tipc/bearer.c +++ b/net/tipc/bearer.c @@ -243,12 +243,6 @@ static int tipc_enable_bearer(struct net *net, const char *name, int res = -EINVAL; char *errstr = ""; - if (!tipc_own_id(net)) { - errstr = "not supported in standalone mode"; - res = -ENOPROTOOPT; - goto rejected; - } - if (!bearer_name_validate(name, &b_names)) { errstr = "illegal name"; goto rejected; @@ -381,11 +375,13 @@ static void bearer_disable(struct net *net, struct tipc_bearer *b) int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, struct nlattr *attr[]) { + char *dev_name = strchr((const char *)b->name, ':') + 1; + int hwaddr_len = b->media->hwaddr_len; + u8 node_id[NODE_ID_LEN] = {0,}; struct net_device *dev; - char *driver_name = strchr((const char *)b->name, ':') + 1; /* Find device with specified name */ - dev = dev_get_by_name(net, driver_name); + dev = dev_get_by_name(net, dev_name); if (!dev) return -ENODEV; if (tipc_mtu_bad(dev, 0)) { @@ -393,6 +389,16 @@ int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, return -EINVAL; } + /* Autoconfigure own node identity if needed */ + if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) { + memcpy(node_id, dev->dev_addr, hwaddr_len); + tipc_net_init(net, node_id, 0); + } + if (!tipc_own_id(net)) { + pr_warn("Failed to obtain node identity\n"); + return -EINVAL; + } + /* Associate TIPC bearer with L2 bearer */ rcu_assign_pointer(b->media_ptr, dev); b->pt.dev = dev; @@ -400,7 +406,7 @@ int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, b->pt.func = tipc_l2_rcv_msg; dev_add_pack(&b->pt); memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); - memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); + memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len); b->bcast_addr.media_id = b->media->type_id; b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; b->mtu = dev->mtu; diff --git a/net/tipc/net.h b/net/tipc/net.h index 08efa6010022..09ad02b50bb1 100644 --- a/net/tipc/net.h +++ b/net/tipc/net.h @@ -41,6 +41,7 @@ extern const struct nla_policy tipc_nl_net_policy[]; +int tipc_net_init(struct net *net, u8 *node_id, u32 addr); void tipc_net_finalize(struct net *net, u32 addr); void tipc_net_stop(struct net *net); int tipc_nl_net_dump(struct sk_buff *skb, struct netlink_callback *cb); diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c index 3deabcab4882..2c13b18426d9 100644 --- a/net/tipc/udp_media.c +++ b/net/tipc/udp_media.c @@ -47,6 +47,8 @@ #include #include #include "core.h" +#include "addr.h" +#include "net.h" #include "bearer.h" #include "netlink.h" #include "msg.h" @@ -647,6 +649,7 @@ static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, struct udp_port_cfg udp_conf = {0}; struct udp_tunnel_sock_cfg tuncfg = {NULL}; struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; + u8 node_id[NODE_ID_LEN] = {0,}; ub = kzalloc(sizeof(*ub), GFP_ATOMIC); if (!ub) @@ -677,6 +680,16 @@ static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, if (err) goto err; + /* Autoconfigure own node identity if needed */ + if (!tipc_own_id(net)) { + memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16); + tipc_net_init(net, node_id, 0); + } + if (!tipc_own_id(net)) { + pr_warn("Failed to set node id, please configure manually\n"); + return -EINVAL; + } + b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; rcu_assign_pointer(b->media_ptr, ub); -- 2.20.1