X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Fbridge%2Fbr_netlink.c;h=a9139682c49bf1aa9697fdbf1c4e5d2ebe29222a;hb=refs%2Fheads%2Fvserver;hp=53086fb75089346c0fd8658a0d2edcc41d9324ce;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c index 53086fb75..a9139682c 100644 --- a/net/bridge/br_netlink.c +++ b/net/bridge/br_netlink.c @@ -12,8 +12,21 @@ #include #include +#include #include "br_private.h" +static inline size_t br_nlmsg_size(void) +{ + return NLMSG_ALIGN(sizeof(struct ifinfomsg)) + + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ + + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ + + nla_total_size(4) /* IFLA_MASTER */ + + nla_total_size(4) /* IFLA_MTU */ + + nla_total_size(4) /* IFLA_LINK */ + + nla_total_size(1) /* IFLA_OPERSTATE */ + + nla_total_size(1); /* IFLA_PROTINFO */ +} + /* * Create one netlink message for one interface * Contains port and master info as well as carrier and bridge state. @@ -23,51 +36,43 @@ static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *por { const struct net_bridge *br = port->br; const struct net_device *dev = port->dev; - struct ifinfomsg *r; + struct ifinfomsg *hdr; struct nlmsghdr *nlh; - unsigned char *b = skb->tail; - u32 mtu = dev->mtu; u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; - u8 portstate = port->state; pr_debug("br_fill_info event %d port %s master %s\n", event, dev->name, br->dev->name); - nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); - r = NLMSG_DATA(nlh); - r->ifi_family = AF_BRIDGE; - r->__ifi_pad = 0; - r->ifi_type = dev->type; - r->ifi_index = dev->ifindex; - r->ifi_flags = dev_get_flags(dev); - r->ifi_change = 0; + nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); + if (nlh == NULL) + return -ENOBUFS; - RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); + hdr = nlmsg_data(nlh); + hdr->ifi_family = AF_BRIDGE; + hdr->__ifi_pad = 0; + hdr->ifi_type = dev->type; + hdr->ifi_index = dev->ifindex; + hdr->ifi_flags = dev_get_flags(dev); + hdr->ifi_change = 0; - RTA_PUT(skb, IFLA_MASTER, sizeof(int), &br->dev->ifindex); + NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); + NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex); + NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); + NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate); if (dev->addr_len) - RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); + NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); - RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu); if (dev->ifindex != dev->iflink) - RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink); - - - RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate); + NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); if (event == RTM_NEWLINK) - RTA_PUT(skb, IFLA_PROTINFO, sizeof(portstate), &portstate); + NLA_PUT_U8(skb, IFLA_PROTINFO, port->state); - nlh->nlmsg_len = skb->tail - b; + return nlmsg_end(skb, nlh); - return skb->len; - -nlmsg_failure: -rtattr_failure: - - skb_trim(skb, b - skb->data); - return -EINVAL; +nla_put_failure: + return nlmsg_cancel(skb, nlh); } /* @@ -76,26 +81,21 @@ rtattr_failure: void br_ifinfo_notify(int event, struct net_bridge_port *port) { struct sk_buff *skb; - int err = -ENOMEM; + int err = -ENOBUFS; pr_debug("bridge notify event=%d\n", event); - skb = alloc_skb(NLMSG_SPACE(sizeof(struct ifinfomsg) + 128), - GFP_ATOMIC); - if (!skb) - goto err_out; + skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC); + if (skb == NULL) + goto errout; - err = br_fill_ifinfo(skb, port, current->pid, 0, event, 0); - if (err < 0) - goto err_kfree; + err = br_fill_ifinfo(skb, port, 0, 0, event, 0); + /* failure implies BUG in br_nlmsg_size() */ + BUG_ON(err < 0); - NETLINK_CB(skb).dst_group = RTNLGRP_LINK; - netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_ATOMIC); - return; - -err_kfree: - kfree_skb(skb); -err_out: - netlink_set_err(rtnl, 0, RTNLGRP_LINK, err); + err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); +errout: + if (err < 0) + rtnl_set_sk_err(RTNLGRP_LINK, err); } /* @@ -105,25 +105,18 @@ static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) { struct net_device *dev; int idx; - int s_idx = cb->args[0]; - int err = 0; read_lock(&dev_base_lock); for (dev = dev_base, idx = 0; dev; dev = dev->next) { - struct net_bridge_port *p = dev->br_port; - /* not a bridge port */ - if (!p) - continue; - - if (idx < s_idx) - goto cont; + if (dev->br_port == NULL || idx < cb->args[0]) + goto skip; - err = br_fill_ifinfo(skb, p, NETLINK_CB(cb->skb).pid, - cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); - if (err <= 0) + if (br_fill_ifinfo(skb, dev->br_port, NETLINK_CB(cb->skb).pid, + cb->nlh->nlmsg_seq, RTM_NEWLINK, + NLM_F_MULTI) < 0) break; -cont: +skip: ++idx; } read_unlock(&dev_base_lock); @@ -139,26 +132,27 @@ cont: */ static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) { - struct rtattr **rta = arg; - struct ifinfomsg *ifm = NLMSG_DATA(nlh); + struct ifinfomsg *ifm; + struct nlattr *protinfo; struct net_device *dev; struct net_bridge_port *p; u8 new_state; + if (nlmsg_len(nlh) < sizeof(*ifm)) + return -EINVAL; + + ifm = nlmsg_data(nlh); if (ifm->ifi_family != AF_BRIDGE) return -EPFNOSUPPORT; - /* Must pass valid state as PROTINFO */ - if (rta[IFLA_PROTINFO-1]) { - u8 *pstate = RTA_DATA(rta[IFLA_PROTINFO-1]); - new_state = *pstate; - } else + protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO); + if (!protinfo || nla_len(protinfo) < sizeof(u8)) return -EINVAL; + new_state = nla_get_u8(protinfo); if (new_state > BR_STATE_BLOCKING) return -EINVAL; - /* Find bridge port */ dev = __dev_get_by_index(ifm->ifi_index); if (!dev) return -ENODEV; @@ -171,10 +165,8 @@ static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) if (p->br->stp_enabled) return -EBUSY; - if (!netif_running(dev)) - return -ENETDOWN; - - if (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED) + if (!netif_running(dev) || + (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)) return -ENETDOWN; p->state = new_state;