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neighbour: register rtnl doit handler
this patch registers neigh doit handler. The doit handler returns a neigh entry given dst and dev. This is similar to route and fdb doit (get) handlers. Also moves nda_policy declaration from rtnetlink.c to neighbour.c Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Reviewed-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roopa Prabhu
David S. Miller
parent
4ab0edecaf
commit
82cbb5c631
3 changed files with 194 additions and 23 deletions
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@ -255,6 +255,7 @@ static inline void *neighbour_priv(const struct neighbour *n)
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#define NEIGH_UPDATE_F_ISROUTER 0x40000000
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#define NEIGH_UPDATE_F_ADMIN 0x80000000
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extern const struct nla_policy nda_policy[];
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static inline bool neigh_key_eq16(const struct neighbour *n, const void *pkey)
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{
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@ -1751,6 +1751,18 @@ static struct neigh_table *neigh_find_table(int family)
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return tbl;
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}
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const struct nla_policy nda_policy[NDA_MAX+1] = {
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[NDA_DST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
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[NDA_LLADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
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[NDA_CACHEINFO] = { .len = sizeof(struct nda_cacheinfo) },
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[NDA_PROBES] = { .type = NLA_U32 },
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[NDA_VLAN] = { .type = NLA_U16 },
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[NDA_PORT] = { .type = NLA_U16 },
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[NDA_VNI] = { .type = NLA_U32 },
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[NDA_IFINDEX] = { .type = NLA_U32 },
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[NDA_MASTER] = { .type = NLA_U32 },
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};
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static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh,
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struct netlink_ext_ack *extack)
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{
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@ -2711,6 +2723,186 @@ static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
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return skb->len;
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}
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static int neigh_valid_get_req(const struct nlmsghdr *nlh,
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struct neigh_table **tbl,
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void **dst, int *dev_idx, u8 *ndm_flags,
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struct netlink_ext_ack *extack)
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{
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struct nlattr *tb[NDA_MAX + 1];
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struct ndmsg *ndm;
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int err, i;
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if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
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NL_SET_ERR_MSG(extack, "Invalid header for neighbor get request");
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return -EINVAL;
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}
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ndm = nlmsg_data(nlh);
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if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state ||
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ndm->ndm_type) {
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NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor get request");
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return -EINVAL;
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}
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if (ndm->ndm_flags & ~NTF_PROXY) {
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NL_SET_ERR_MSG(extack, "Invalid flags in header for neighbor get request");
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return -EINVAL;
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}
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err = nlmsg_parse_strict(nlh, sizeof(struct ndmsg), tb, NDA_MAX,
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nda_policy, extack);
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if (err < 0)
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return err;
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*ndm_flags = ndm->ndm_flags;
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*dev_idx = ndm->ndm_ifindex;
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*tbl = neigh_find_table(ndm->ndm_family);
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if (*tbl == NULL) {
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NL_SET_ERR_MSG(extack, "Unsupported family in header for neighbor get request");
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return -EAFNOSUPPORT;
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}
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for (i = 0; i <= NDA_MAX; ++i) {
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if (!tb[i])
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continue;
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switch (i) {
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case NDA_DST:
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if (nla_len(tb[i]) != (int)(*tbl)->key_len) {
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NL_SET_ERR_MSG(extack, "Invalid network address in neighbor get request");
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return -EINVAL;
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}
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*dst = nla_data(tb[i]);
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break;
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default:
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NL_SET_ERR_MSG(extack, "Unsupported attribute in neighbor get request");
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return -EINVAL;
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}
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}
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return 0;
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}
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static inline size_t neigh_nlmsg_size(void)
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{
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return NLMSG_ALIGN(sizeof(struct ndmsg))
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+ nla_total_size(MAX_ADDR_LEN) /* NDA_DST */
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+ nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */
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+ nla_total_size(sizeof(struct nda_cacheinfo))
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+ nla_total_size(4) /* NDA_PROBES */
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+ nla_total_size(1); /* NDA_PROTOCOL */
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}
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static int neigh_get_reply(struct net *net, struct neighbour *neigh,
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u32 pid, u32 seq)
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{
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struct sk_buff *skb;
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int err = 0;
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skb = nlmsg_new(neigh_nlmsg_size(), GFP_KERNEL);
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if (!skb)
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return -ENOBUFS;
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err = neigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0);
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if (err) {
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kfree_skb(skb);
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goto errout;
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}
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err = rtnl_unicast(skb, net, pid);
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errout:
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return err;
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}
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static inline size_t pneigh_nlmsg_size(void)
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{
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return NLMSG_ALIGN(sizeof(struct ndmsg))
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+ nla_total_size(MAX_ADDR_LEN); /* NDA_DST */
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+ nla_total_size(1); /* NDA_PROTOCOL */
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}
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static int pneigh_get_reply(struct net *net, struct pneigh_entry *neigh,
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u32 pid, u32 seq, struct neigh_table *tbl)
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{
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struct sk_buff *skb;
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int err = 0;
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skb = nlmsg_new(pneigh_nlmsg_size(), GFP_KERNEL);
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if (!skb)
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return -ENOBUFS;
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err = pneigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0, tbl);
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if (err) {
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kfree_skb(skb);
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goto errout;
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}
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err = rtnl_unicast(skb, net, pid);
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errout:
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return err;
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}
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static int neigh_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
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struct netlink_ext_ack *extack)
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{
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struct net *net = sock_net(in_skb->sk);
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struct net_device *dev = NULL;
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struct neigh_table *tbl = NULL;
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struct neighbour *neigh;
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void *dst = NULL;
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u8 ndm_flags = 0;
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int dev_idx = 0;
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int err;
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err = neigh_valid_get_req(nlh, &tbl, &dst, &dev_idx, &ndm_flags,
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extack);
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if (err < 0)
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return err;
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if (dev_idx) {
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dev = __dev_get_by_index(net, dev_idx);
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if (!dev) {
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NL_SET_ERR_MSG(extack, "Unknown device ifindex");
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return -ENODEV;
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}
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}
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if (!dst) {
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NL_SET_ERR_MSG(extack, "Network address not specified");
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return -EINVAL;
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}
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if (ndm_flags & NTF_PROXY) {
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struct pneigh_entry *pn;
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pn = pneigh_lookup(tbl, net, dst, dev, 0);
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if (!pn) {
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NL_SET_ERR_MSG(extack, "Proxy neighbour entry not found");
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return -ENOENT;
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}
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return pneigh_get_reply(net, pn, NETLINK_CB(in_skb).portid,
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nlh->nlmsg_seq, tbl);
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}
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if (!dev) {
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NL_SET_ERR_MSG(extack, "No device specified");
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return -EINVAL;
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}
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neigh = neigh_lookup(tbl, dst, dev);
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if (!neigh) {
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NL_SET_ERR_MSG(extack, "Neighbour entry not found");
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return -ENOENT;
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}
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err = neigh_get_reply(net, neigh, NETLINK_CB(in_skb).portid,
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nlh->nlmsg_seq);
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neigh_release(neigh);
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return err;
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}
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void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie)
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{
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int chain;
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@ -3118,16 +3310,6 @@ static const struct seq_operations neigh_stat_seq_ops = {
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};
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#endif /* CONFIG_PROC_FS */
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static inline size_t neigh_nlmsg_size(void)
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{
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return NLMSG_ALIGN(sizeof(struct ndmsg))
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+ nla_total_size(MAX_ADDR_LEN) /* NDA_DST */
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+ nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */
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+ nla_total_size(sizeof(struct nda_cacheinfo))
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+ nla_total_size(4) /* NDA_PROBES */
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+ nla_total_size(1); /* NDA_PROTOCOL */
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}
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static void __neigh_notify(struct neighbour *n, int type, int flags,
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u32 pid)
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{
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@ -3511,7 +3693,7 @@ static int __init neigh_init(void)
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{
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rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, 0);
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rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, 0);
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rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info, 0);
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rtnl_register(PF_UNSPEC, RTM_GETNEIGH, neigh_get, neigh_dump_info, 0);
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rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info,
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0);
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@ -3460,18 +3460,6 @@ void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
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new_nsid, new_ifindex);
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}
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static const struct nla_policy nda_policy[NDA_MAX+1] = {
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[NDA_DST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
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[NDA_LLADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
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[NDA_CACHEINFO] = { .len = sizeof(struct nda_cacheinfo) },
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[NDA_PROBES] = { .type = NLA_U32 },
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[NDA_VLAN] = { .type = NLA_U16 },
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[NDA_PORT] = { .type = NLA_U16 },
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[NDA_VNI] = { .type = NLA_U32 },
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[NDA_IFINDEX] = { .type = NLA_U32 },
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[NDA_MASTER] = { .type = NLA_U32 },
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};
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static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
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struct net_device *dev,
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u8 *addr, u16 vid, u32 pid, u32 seq,
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