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[NET]: Convert link dumping to new netlink api

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Transforms netlink code to dump link tables to use the new
netlink api. Makes rtnl_getlink() available regardless of the
availability of the wireless extensions.

Adding copy_rtnl_link_stats() avoids the structural dependency
of struct rtnl_link_stats on struct net_device_stats and thus
avoids troubles later on.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2006-08-04 23:05:34 -07:00 committed by David S. Miller
parent da5e0494c5
commit b60c5115f4
1 changed files with 133 additions and 140 deletions
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273
net/core/rtnetlink.c
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@ -218,41 +218,73 @@ static void set_operstate(struct net_device *dev, unsigned char transition)
} }
} }
static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
int type, u32 pid, u32 seq, u32 change, struct net_device_stats *b)
unsigned int flags)
{ {
struct ifinfomsg *r; a->rx_packets = b->rx_packets;
struct nlmsghdr *nlh; a->tx_packets = b->tx_packets;
unsigned char *b = skb->tail; a->rx_bytes = b->rx_bytes;
a->tx_bytes = b->tx_bytes;
a->rx_errors = b->rx_errors;
a->tx_errors = b->tx_errors;
a->rx_dropped = b->rx_dropped;
a->tx_dropped = b->tx_dropped;
nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*r), flags); a->multicast = b->multicast;
r = NLMSG_DATA(nlh); a->collisions = b->collisions;
r->ifi_family = AF_UNSPEC;
r->__ifi_pad = 0;
r->ifi_type = dev->type;
r->ifi_index = dev->ifindex;
r->ifi_flags = dev_get_flags(dev);
r->ifi_change = change;
RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); a->rx_length_errors = b->rx_length_errors;
a->rx_over_errors = b->rx_over_errors;
a->rx_crc_errors = b->rx_crc_errors;
a->rx_frame_errors = b->rx_frame_errors;
a->rx_fifo_errors = b->rx_fifo_errors;
a->rx_missed_errors = b->rx_missed_errors;
if (1) { a->tx_aborted_errors = b->tx_aborted_errors;
u32 txqlen = dev->tx_queue_len; a->tx_carrier_errors = b->tx_carrier_errors;
RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen); a->tx_fifo_errors = b->tx_fifo_errors;
} a->tx_heartbeat_errors = b->tx_heartbeat_errors;
a->tx_window_errors = b->tx_window_errors;
if (1) { a->rx_compressed = b->rx_compressed;
u32 weight = dev->weight; a->tx_compressed = b->tx_compressed;
RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight); };
}
if (1) { static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
u8 operstate = netif_running(dev)?dev->operstate:IF_OPER_DOWN; void *iwbuf, int iwbuflen, int type, u32 pid,
u8 link_mode = dev->link_mode; u32 seq, u32 change, unsigned int flags)
RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate); {
RTA_PUT(skb, IFLA_LINKMODE, sizeof(link_mode), &link_mode); struct ifinfomsg *ifm;
} struct nlmsghdr *nlh;
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
if (nlh == NULL)
return -ENOBUFS;
ifm = nlmsg_data(nlh);
ifm->ifi_family = AF_UNSPEC;
ifm->__ifi_pad = 0;
ifm->ifi_type = dev->type;
ifm->ifi_index = dev->ifindex;
ifm->ifi_flags = dev_get_flags(dev);
ifm->ifi_change = change;
NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
NLA_PUT_U8(skb, IFLA_OPERSTATE,
netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
if (dev->ifindex != dev->iflink)
NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
if (dev->master)
NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
if (dev->qdisc_sleeping)
NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
if (1) { if (1) {
struct rtnl_link_ifmap map = { struct rtnl_link_ifmap map = {
@ -263,58 +295,38 @@ static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
.dma = dev->dma, .dma = dev->dma,
.port = dev->if_port, .port = dev->if_port,
}; };
RTA_PUT(skb, IFLA_MAP, sizeof(map), &map); NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
} }
if (dev->addr_len) { 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_BROADCAST, dev->addr_len, dev->broadcast); NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
}
if (1) {
u32 mtu = dev->mtu;
RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
}
if (dev->ifindex != dev->iflink) {
u32 iflink = dev->iflink;
RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink);
}
if (dev->qdisc_sleeping)
RTA_PUT(skb, IFLA_QDISC,
strlen(dev->qdisc_sleeping->ops->id) + 1,
dev->qdisc_sleeping->ops->id);
if (dev->master) {
u32 master = dev->master->ifindex;
RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master);
} }
if (dev->get_stats) { if (dev->get_stats) {
unsigned long *stats = (unsigned long*)dev->get_stats(dev); struct net_device_stats *stats = dev->get_stats(dev);
if (stats) { if (stats) {
struct rtattr *a; struct nlattr *attr;
__u32 *s;
int i;
int n = sizeof(struct rtnl_link_stats)/4;
a = __RTA_PUT(skb, IFLA_STATS, n*4); attr = nla_reserve(skb, IFLA_STATS,
s = RTA_DATA(a); sizeof(struct rtnl_link_stats));
for (i=0; i<n; i++) if (attr == NULL)
s[i] = stats[i]; goto nla_put_failure;
copy_rtnl_link_stats(nla_data(attr), stats);
} }
} }
nlh->nlmsg_len = skb->tail - b;
return skb->len;
nlmsg_failure: if (iwbuf)
rtattr_failure: NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
skb_trim(skb, b - skb->data);
return -1; return nlmsg_end(skb, nlh);
nla_put_failure:
return nlmsg_cancel(skb, nlh);
} }
static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
{ {
int idx; int idx;
int s_idx = cb->args[0]; int s_idx = cb->args[0];
@ -324,10 +336,9 @@ static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *c
for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
if (idx < s_idx) if (idx < s_idx)
continue; continue;
if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK, if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
NETLINK_CB(cb->skb).pid, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, 0, cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
NLM_F_MULTI) <= 0)
break; break;
} }
read_unlock(&dev_base_lock); read_unlock(&dev_base_lock);
@ -515,84 +526,69 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
return err; return err;
} }
#ifdef CONFIG_NET_WIRELESS_RTNETLINK static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
static int do_getlink(struct sk_buff *in_skb, struct nlmsghdr* in_nlh, void *arg)
{ {
struct ifinfomsg *ifm = NLMSG_DATA(in_nlh); struct ifinfomsg *ifm;
struct rtattr **ida = arg; struct nlattr *tb[IFLA_MAX+1];
struct net_device *dev; struct net_device *dev = NULL;
struct ifinfomsg *r; struct sk_buff *nskb;
struct nlmsghdr *nlh; char *iw_buf = NULL, *iw = NULL;
int err = -ENOBUFS;
struct sk_buff *skb;
unsigned char *b;
char *iw_buf = NULL;
int iw_buf_len = 0; int iw_buf_len = 0;
int err, payload;
if (ifm->ifi_index >= 0) err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
if (err < 0)
goto errout;
ifm = nlmsg_data(nlh);
if (ifm->ifi_index >= 0) {
dev = dev_get_by_index(ifm->ifi_index); dev = dev_get_by_index(ifm->ifi_index);
else if (dev == NULL)
return -ENODEV;
} else
return -EINVAL; return -EINVAL;
if (!dev)
return -ENODEV;
#ifdef CONFIG_NET_WIRELESS_RTNETLINK #ifdef CONFIG_NET_WIRELESS_RTNETLINK
if (ida[IFLA_WIRELESS - 1]) { if (tb[IFLA_WIRELESS]) {
/* Call Wireless Extensions. We need to know the size before /* Call Wireless Extensions. We need to know the size before
* we can alloc. Various stuff checked in there... */ * we can alloc. Various stuff checked in there... */
err = wireless_rtnetlink_get(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len, &iw_buf, &iw_buf_len); err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
if (err) nla_len(tb[IFLA_WIRELESS]),
goto out; &iw_buf, &iw_buf_len);
if (err < 0)
goto errout;
iw += IW_EV_POINT_OFF;
} }
#endif /* CONFIG_NET_WIRELESS_RTNETLINK */ #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
/* Create a skb big enough to include all the data. payload = NLMSG_ALIGN(sizeof(struct ifinfomsg) +
* Some requests are way bigger than 4k... Jean II */ nla_total_size(iw_buf_len));
skb = alloc_skb((NLMSG_LENGTH(sizeof(*r))) + (RTA_SPACE(iw_buf_len)), nskb = nlmsg_new(nlmsg_total_size(payload), GFP_KERNEL);
GFP_KERNEL); if (nskb == NULL) {
if (!skb) err = -ENOBUFS;
goto out; goto errout;
b = skb->tail; }
/* Put in the message the usual good stuff */ err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, in_nlh->nlmsg_seq, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
RTM_NEWLINK, sizeof(*r)); if (err <= 0) {
r = NLMSG_DATA(nlh); kfree_skb(skb);
r->ifi_family = AF_UNSPEC; goto errout;
r->__ifi_pad = 0; }
r->ifi_type = dev->type;
r->ifi_index = dev->ifindex;
r->ifi_flags = dev->flags;
r->ifi_change = 0;
/* Put the wireless payload if it exist */ err = netlink_unicast(rtnl, skb, NETLINK_CB(skb).pid, MSG_DONTWAIT);
if(iw_buf != NULL)
RTA_PUT(skb, IFLA_WIRELESS, iw_buf_len,
iw_buf + IW_EV_POINT_OFF);
nlh->nlmsg_len = skb->tail - b;
/* Needed ? */
NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
if (err > 0) if (err > 0)
err = 0; err = 0;
out: errout:
if(iw_buf != NULL) kfree(iw_buf);
kfree(iw_buf);
dev_put(dev); dev_put(dev);
return err; return err;
rtattr_failure:
nlmsg_failure:
kfree_skb(skb);
goto out;
} }
#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb) static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
{ {
int idx; int idx;
int s_idx = cb->family; int s_idx = cb->family;
@ -623,11 +619,11 @@ void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
sizeof(struct rtnl_link_ifmap) + sizeof(struct rtnl_link_ifmap) +
sizeof(struct rtnl_link_stats) + 128); sizeof(struct rtnl_link_stats) + 128);
skb = alloc_skb(size, GFP_KERNEL); skb = nlmsg_new(size, GFP_KERNEL);
if (!skb) if (!skb)
return; return;
if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change, 0) < 0) { if (rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0) < 0) {
kfree_skb(skb); kfree_skb(skb);
return; return;
} }
@ -757,14 +753,11 @@ static void rtnetlink_rcv(struct sock *sk, int len)
static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] = static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
{ {
[RTM_GETLINK - RTM_BASE] = { [RTM_GETLINK - RTM_BASE] = { .doit = rtnl_getlink,
#ifdef CONFIG_NET_WIRELESS_RTNETLINK .dumpit = rtnl_dump_ifinfo },
.doit = do_getlink,
#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
.dumpit = rtnetlink_dump_ifinfo },
[RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink }, [RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink },
[RTM_GETADDR - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnl_dump_all },
[RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnl_dump_all },
[RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add }, [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add },
[RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete }, [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete },
[RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info }, [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info },
@ -772,7 +765,7 @@ static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
[RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule }, [RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule },
[RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule }, [RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule },
#endif #endif
[RTM_GETRULE - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnl_dump_all },
[RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info }, [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info },
[RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set }, [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set },
}; };