From a76d1ca296a7eefba5d186014fc4cd14ee98c28b Mon Sep 17 00:00:00 2001 From: Petr Machata Date: Wed, 16 Jan 2019 23:06:32 +0000 Subject: vxlan: Split vxlan_fdb_update() in two In order to make it easier to implement rollbacks after FDB update vetoing, separate the FDB update code to two parts: one that deals with updates of existing FDB entries, and one that creates new entries. Signed-off-by: Petr Machata Signed-off-by: David S. Miller --- drivers/net/vxlan.c | 158 ++++++++++++++++++++++++++++++++-------------------- 1 file changed, 97 insertions(+), 61 deletions(-) (limited to 'drivers/net/vxlan.c') diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index e4ace5e917a7..aeaa429229c7 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -855,92 +855,128 @@ static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, call_rcu(&f->rcu, vxlan_fdb_free); } -/* Add new entry to forwarding table -- assumes lock held */ -static int vxlan_fdb_update(struct vxlan_dev *vxlan, - const u8 *mac, union vxlan_addr *ip, - __u16 state, __u16 flags, - __be16 port, __be32 src_vni, __be32 vni, - __u32 ifindex, __u16 ndm_flags, - bool swdev_notify) +static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan, + union vxlan_addr *ip, + __u16 state, __u16 flags, + __be16 port, __be32 vni, + __u32 ifindex, __u16 ndm_flags, + struct vxlan_fdb *f, + bool swdev_notify) { __u16 fdb_flags = (ndm_flags & ~NTF_USE); struct vxlan_rdst *rd = NULL; - struct vxlan_fdb *f; int notify = 0; int rc; - f = __vxlan_find_mac(vxlan, mac, src_vni); - if (f) { - if (flags & NLM_F_EXCL) { - netdev_dbg(vxlan->dev, - "lost race to create %pM\n", mac); - return -EEXIST; - } - - /* Do not allow an externally learned entry to take over an - * entry added by the user. - */ - if (!(fdb_flags & NTF_EXT_LEARNED) || - !(f->flags & NTF_VXLAN_ADDED_BY_USER)) { - if (f->state != state) { - f->state = state; - f->updated = jiffies; - notify = 1; - } - if (f->flags != fdb_flags) { - f->flags = fdb_flags; - f->updated = jiffies; - notify = 1; - } + /* Do not allow an externally learned entry to take over an entry added + * by the user. + */ + if (!(fdb_flags & NTF_EXT_LEARNED) || + !(f->flags & NTF_VXLAN_ADDED_BY_USER)) { + if (f->state != state) { + f->state = state; + f->updated = jiffies; + notify = 1; } - - if ((flags & NLM_F_REPLACE)) { - /* Only change unicasts */ - if (!(is_multicast_ether_addr(f->eth_addr) || - is_zero_ether_addr(f->eth_addr))) { - notify |= vxlan_fdb_replace(f, ip, port, vni, - ifindex); - } else - return -EOPNOTSUPP; + if (f->flags != fdb_flags) { + f->flags = fdb_flags; + f->updated = jiffies; + notify = 1; } - if ((flags & NLM_F_APPEND) && - (is_multicast_ether_addr(f->eth_addr) || - is_zero_ether_addr(f->eth_addr))) { - rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); + } - if (rc < 0) - return rc; + if ((flags & NLM_F_REPLACE)) { + /* Only change unicasts */ + if (!(is_multicast_ether_addr(f->eth_addr) || + is_zero_ether_addr(f->eth_addr))) { + rc = vxlan_fdb_replace(f, ip, port, vni, + ifindex); notify |= rc; - } - - if (ndm_flags & NTF_USE) - f->used = jiffies; - } else { - if (!(flags & NLM_F_CREATE)) - return -ENOENT; - - /* Disallow replace to add a multicast entry */ - if ((flags & NLM_F_REPLACE) && - (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac))) + } else { return -EOPNOTSUPP; + } + } + if ((flags & NLM_F_APPEND) && + (is_multicast_ether_addr(f->eth_addr) || + is_zero_ether_addr(f->eth_addr))) { + rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); - netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); - rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni, - vni, ifindex, fdb_flags, &f); if (rc < 0) return rc; - notify = 1; + notify |= rc; } + if (ndm_flags & NTF_USE) + f->used = jiffies; + if (notify) { if (rd == NULL) rd = first_remote_rtnl(f); + vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, swdev_notify); } return 0; } +static int vxlan_fdb_update_create(struct vxlan_dev *vxlan, + const u8 *mac, union vxlan_addr *ip, + __u16 state, __u16 flags, + __be16 port, __be32 src_vni, __be32 vni, + __u32 ifindex, __u16 ndm_flags, + bool swdev_notify) +{ + __u16 fdb_flags = (ndm_flags & ~NTF_USE); + struct vxlan_fdb *f; + int rc; + + /* Disallow replace to add a multicast entry */ + if ((flags & NLM_F_REPLACE) && + (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac))) + return -EOPNOTSUPP; + + netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); + rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni, + vni, ifindex, fdb_flags, &f); + if (rc < 0) + return rc; + + vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH, + swdev_notify); + return 0; +} + +/* Add new entry to forwarding table -- assumes lock held */ +static int vxlan_fdb_update(struct vxlan_dev *vxlan, + const u8 *mac, union vxlan_addr *ip, + __u16 state, __u16 flags, + __be16 port, __be32 src_vni, __be32 vni, + __u32 ifindex, __u16 ndm_flags, + bool swdev_notify) +{ + struct vxlan_fdb *f; + + f = __vxlan_find_mac(vxlan, mac, src_vni); + if (f) { + if (flags & NLM_F_EXCL) { + netdev_dbg(vxlan->dev, + "lost race to create %pM\n", mac); + return -EEXIST; + } + + return vxlan_fdb_update_existing(vxlan, ip, state, flags, port, + vni, ifindex, ndm_flags, f, + swdev_notify); + } else { + if (!(flags & NLM_F_CREATE)) + return -ENOENT; + + return vxlan_fdb_update_create(vxlan, mac, ip, state, flags, + port, src_vni, vni, ifindex, + ndm_flags, swdev_notify); + } +} + static void vxlan_dst_free(struct rcu_head *head) { struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu); 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