From c384b8a70c59d85f83a05c8963e71d35da2607b9 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 19 May 2020 15:03:11 +0200 Subject: ipv4: streamline ipmr_new_tunnel Reduce a few level of indentation to simplify the function. Signed-off-by: Christoph Hellwig Signed-off-by: David S. Miller --- net/ipv4/ipmr.c | 73 ++++++++++++++++++++++++++++----------------------------- 1 file changed, 36 insertions(+), 37 deletions(-) (limited to 'net/ipv4/ipmr.c') diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index 5c218db2dede..a1169b694113 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -471,50 +471,49 @@ static bool ipmr_init_vif_indev(const struct net_device *dev) static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) { - struct net_device *dev; + struct net_device *tunnel_dev, *new_dev; + struct ip_tunnel_parm p = { }; + mm_segment_t oldfs = get_fs(); + struct ifreq ifr; + int err; - dev = __dev_get_by_name(net, "tunl0"); + tunnel_dev = __dev_get_by_name(net, "tunl0"); + if (!tunnel_dev) + goto out; - if (dev) { - const struct net_device_ops *ops = dev->netdev_ops; - int err; - struct ifreq ifr; - struct ip_tunnel_parm p; + p.iph.daddr = v->vifc_rmt_addr.s_addr; + p.iph.saddr = v->vifc_lcl_addr.s_addr; + p.iph.version = 4; + p.iph.ihl = 5; + p.iph.protocol = IPPROTO_IPIP; + sprintf(p.name, "dvmrp%d", v->vifc_vifi); + ifr.ifr_ifru.ifru_data = (__force void __user *)&p; - memset(&p, 0, sizeof(p)); - p.iph.daddr = v->vifc_rmt_addr.s_addr; - p.iph.saddr = v->vifc_lcl_addr.s_addr; - p.iph.version = 4; - p.iph.ihl = 5; - p.iph.protocol = IPPROTO_IPIP; - sprintf(p.name, "dvmrp%d", v->vifc_vifi); - ifr.ifr_ifru.ifru_data = (__force void __user *)&p; + if (!tunnel_dev->netdev_ops->ndo_do_ioctl) + goto out; - if (ops->ndo_do_ioctl) { - mm_segment_t oldfs = get_fs(); + set_fs(KERNEL_DS); + err = tunnel_dev->netdev_ops->ndo_do_ioctl(tunnel_dev, &ifr, + SIOCADDTUNNEL); + set_fs(oldfs); + if (err) + goto out; - set_fs(KERNEL_DS); - err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); - set_fs(oldfs); - } else { - err = -EOPNOTSUPP; - } - dev = NULL; + new_dev = __dev_get_by_name(net, p.name); + if (!new_dev) + goto out; - if (err == 0 && - (dev = __dev_get_by_name(net, p.name)) != NULL) { - dev->flags |= IFF_MULTICAST; - if (!ipmr_init_vif_indev(dev)) - goto failure; - if (dev_open(dev, NULL)) - goto failure; - dev_hold(dev); - } - } - return dev; + new_dev->flags |= IFF_MULTICAST; + if (!ipmr_init_vif_indev(new_dev)) + goto out_unregister; + if (dev_open(new_dev, NULL)) + goto out_unregister; + dev_hold(new_dev); + return new_dev; -failure: - unregister_netdevice(dev); +out_unregister: + unregister_netdevice(new_dev); +out: return NULL; } -- cgit v1.2.3-59-g8ed1b From c1fd1182c43692022a7938d6b496fa21fcd49717 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 19 May 2020 15:03:12 +0200 Subject: ipv4: consolidate the VIFF_TUNNEL handling in ipmr_new_tunnel Also move the dev_set_allmulti call and the error handling into the ioctl helper. This allows reusing already looked up tunnel_dev pointer and the set up argument structure for the deletion in the error handler. Signed-off-by: Christoph Hellwig Signed-off-by: David S. Miller --- net/ipv4/ipmr.c | 53 +++++++++++++---------------------------------------- 1 file changed, 13 insertions(+), 40 deletions(-) (limited to 'net/ipv4/ipmr.c') diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index a1169b694113..cd1a3260a99a 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -421,37 +421,6 @@ static void ipmr_free_table(struct mr_table *mrt) /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ -static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) -{ - struct net *net = dev_net(dev); - - dev_close(dev); - - dev = __dev_get_by_name(net, "tunl0"); - if (dev) { - const struct net_device_ops *ops = dev->netdev_ops; - struct ifreq ifr; - struct ip_tunnel_parm p; - - memset(&p, 0, sizeof(p)); - p.iph.daddr = v->vifc_rmt_addr.s_addr; - p.iph.saddr = v->vifc_lcl_addr.s_addr; - p.iph.version = 4; - p.iph.ihl = 5; - p.iph.protocol = IPPROTO_IPIP; - sprintf(p.name, "dvmrp%d", v->vifc_vifi); - ifr.ifr_ifru.ifru_data = (__force void __user *)&p; - - if (ops->ndo_do_ioctl) { - mm_segment_t oldfs = get_fs(); - - set_fs(KERNEL_DS); - ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); - set_fs(oldfs); - } - } -} - /* Initialize ipmr pimreg/tunnel in_device */ static bool ipmr_init_vif_indev(const struct net_device *dev) { @@ -509,12 +478,22 @@ static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) if (dev_open(new_dev, NULL)) goto out_unregister; dev_hold(new_dev); + err = dev_set_allmulti(new_dev, 1); + if (err) { + dev_close(new_dev); + set_fs(KERNEL_DS); + tunnel_dev->netdev_ops->ndo_do_ioctl(tunnel_dev, &ifr, + SIOCDELTUNNEL); + set_fs(oldfs); + dev_put(new_dev); + new_dev = ERR_PTR(err); + } return new_dev; out_unregister: unregister_netdevice(new_dev); out: - return NULL; + return ERR_PTR(-ENOBUFS); } #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) @@ -866,14 +845,8 @@ static int vif_add(struct net *net, struct mr_table *mrt, break; case VIFF_TUNNEL: dev = ipmr_new_tunnel(net, vifc); - if (!dev) - return -ENOBUFS; - err = dev_set_allmulti(dev, 1); - if (err) { - ipmr_del_tunnel(dev, vifc); - dev_put(dev); - return err; - } + if (IS_ERR(dev)) + return PTR_ERR(dev); break; case VIFF_USE_IFINDEX: case 0: -- cgit v1.2.3-59-g8ed1b From c7e3670516042bfd8147151d9008b5874a6eb73e Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 19 May 2020 15:03:14 +0200 Subject: impr: use ->ndo_tunnel_ctl in ipmr_new_tunnel Use the new ->ndo_tunnel_ctl instead of overriding the address limit and using ->ndo_do_ioctl just to do a pointless user copy. Signed-off-by: Christoph Hellwig Signed-off-by: David S. Miller --- net/ipv4/ipmr.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-) (limited to 'net/ipv4/ipmr.c') diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index cd1a3260a99a..d3e9b80a57de 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -442,8 +442,6 @@ static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) { struct net_device *tunnel_dev, *new_dev; struct ip_tunnel_parm p = { }; - mm_segment_t oldfs = get_fs(); - struct ifreq ifr; int err; tunnel_dev = __dev_get_by_name(net, "tunl0"); @@ -456,15 +454,11 @@ static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) p.iph.ihl = 5; p.iph.protocol = IPPROTO_IPIP; sprintf(p.name, "dvmrp%d", v->vifc_vifi); - ifr.ifr_ifru.ifru_data = (__force void __user *)&p; - if (!tunnel_dev->netdev_ops->ndo_do_ioctl) + if (!tunnel_dev->netdev_ops->ndo_tunnel_ctl) goto out; - - set_fs(KERNEL_DS); - err = tunnel_dev->netdev_ops->ndo_do_ioctl(tunnel_dev, &ifr, + err = tunnel_dev->netdev_ops->ndo_tunnel_ctl(tunnel_dev, &p, SIOCADDTUNNEL); - set_fs(oldfs); if (err) goto out; @@ -481,10 +475,8 @@ static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) err = dev_set_allmulti(new_dev, 1); if (err) { dev_close(new_dev); - set_fs(KERNEL_DS); - tunnel_dev->netdev_ops->ndo_do_ioctl(tunnel_dev, &ifr, + tunnel_dev->netdev_ops->ndo_tunnel_ctl(tunnel_dev, &p, SIOCDELTUNNEL); - set_fs(oldfs); dev_put(new_dev); new_dev = ERR_PTR(err); } -- cgit v1.2.3-59-g8ed1b