diff options
Diffstat (limited to 'backport/compat/backport-4.12.c')
| -rw-r--r-- | backport/compat/backport-4.12.c | 274 |
1 files changed, 0 insertions, 274 deletions
diff --git a/backport/compat/backport-4.12.c b/backport/compat/backport-4.12.c deleted file mode 100644 index 5fc8c10c..00000000 --- a/backport/compat/backport-4.12.c +++ /dev/null @@ -1,274 +0,0 @@ -/* - * Copyright 2017 Intel Deutschland GmbH - */ -#include <net/genetlink.h> -#include <net/sock.h> - -enum nlmsgerr_attrs { - NLMSGERR_ATTR_UNUSED, - NLMSGERR_ATTR_MSG, - NLMSGERR_ATTR_OFFS, - NLMSGERR_ATTR_COOKIE, - __NLMSGERR_ATTR_MAX, - NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1 -}; - -#define NLM_F_CAPPED 0x100 /* request was capped */ -#define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */ - -struct bp_extack_genl_family { - struct genl_family family; - struct genl_family *real_family; - struct list_head list; - - struct genl_ops ops[]; -}; - -static LIST_HEAD(copies_list); -static DEFINE_MUTEX(copies_mutex); - -static const struct nla_policy extack_dummy_policy[1] = {}; - -static struct bp_extack_genl_family *get_copy(__genl_const struct genl_ops *op) -{ - do { - op--; - } while (op->policy != extack_dummy_policy); - - return container_of(op, struct bp_extack_genl_family, ops[0]); -} - -static int extack_pre_doit(__genl_const struct genl_ops *ops, - struct sk_buff *skb, - struct genl_info *info) -{ - struct netlink_ext_ack *extack = kzalloc(sizeof(*extack), GFP_KERNEL); - struct bp_extack_genl_family *copy = get_copy(ops); - struct genl_ops *real_ops; - int err; - - __bp_genl_info_userhdr_set(info, extack); - - if (!extack) { - __bp_genl_info_userhdr_set(info, ERR_PTR(-ENOMEM)); - return -ENOMEM; - } - - real_ops = (void *)©->real_family->ops[ops - ©->ops[1]]; - extack->__bp_genl_real_ops = real_ops; - - if (copy->real_family->pre_doit) - err = copy->real_family->pre_doit(real_ops, skb, info); - else - err = 0; - - if (err) { - __bp_genl_info_userhdr_set(info, ERR_PTR(err)); - kfree(extack); - } - - return err; -} - -static void extack_netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, - int err, const struct netlink_ext_ack *extack) -{ - struct sk_buff *skb; - struct nlmsghdr *rep; - struct nlmsgerr *errmsg; - size_t payload = sizeof(*errmsg); - size_t tlvlen = 0; - unsigned int flags = 0; - /* backports assumes everyone supports this - libnl does so it's true */ - bool nlk_has_extack = true; - - /* Error messages get the original request appened, unless the user - * requests to cap the error message, and get extra error data if - * requested. - * (ignored in backports) - */ - if (nlk_has_extack && extack && extack->_msg) - tlvlen += nla_total_size(strlen(extack->_msg) + 1); - - if (err) { - if (1) - payload += nlmsg_len(nlh); - else - flags |= NLM_F_CAPPED; - if (nlk_has_extack && extack && extack->bad_attr) - tlvlen += nla_total_size(sizeof(u32)); - } else { - flags |= NLM_F_CAPPED; - - if (nlk_has_extack && extack && extack->cookie_len) - tlvlen += nla_total_size(extack->cookie_len); - } - - if (tlvlen) - flags |= NLM_F_ACK_TLVS; - - skb = nlmsg_new(payload + tlvlen, GFP_KERNEL); - if (!skb) { - NETLINK_CB(in_skb).sk->sk_err = ENOBUFS; - NETLINK_CB(in_skb).sk->sk_error_report(NETLINK_CB(in_skb).sk); - return; - } - - rep = __nlmsg_put(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, - NLMSG_ERROR, payload, flags); - errmsg = nlmsg_data(rep); - errmsg->error = err; - memcpy(&errmsg->msg, nlh, payload > sizeof(*errmsg) ? nlh->nlmsg_len : sizeof(*nlh)); - - if (nlk_has_extack && extack) { - if (extack->_msg) { - WARN_ON(nla_put_string(skb, NLMSGERR_ATTR_MSG, - extack->_msg)); - } - if (err) { - if (extack->bad_attr && - !WARN_ON((u8 *)extack->bad_attr < in_skb->data || - (u8 *)extack->bad_attr >= in_skb->data + - in_skb->len)) - WARN_ON(nla_put_u32(skb, NLMSGERR_ATTR_OFFS, - (u8 *)extack->bad_attr - - in_skb->data)); - } else { - if (extack->cookie_len) - WARN_ON(nla_put(skb, NLMSGERR_ATTR_COOKIE, - extack->cookie_len, - extack->cookie)); - } - } - - nlmsg_end(skb, rep); - - netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).portid, MSG_DONTWAIT); -} - -static int extack_doit(struct sk_buff *skb, struct genl_info *info) -{ - struct genl_ops *real_ops; - int err; - - /* older kernels have a bug here */ - if (IS_ERR(__bp_genl_info_userhdr(info))) { - extack_netlink_ack(skb, info->nlhdr, - PTR_ERR(__bp_genl_info_userhdr(info)), - genl_info_extack(info)); - goto out; - } - - real_ops = genl_info_extack(info)->__bp_genl_real_ops; - err = real_ops->doit(skb, info); - - if (err == -EINTR) - return err; - - if (info->nlhdr->nlmsg_flags & NLM_F_ACK || err) - extack_netlink_ack(skb, info->nlhdr, err, - genl_info_extack(info)); - -out: - /* suppress sending ACK from normal netlink code */ - info->nlhdr->nlmsg_flags &= ~NLM_F_ACK; - return 0; -} - -static void extack_post_doit(__genl_const struct genl_ops *ops, - struct sk_buff *skb, - struct genl_info *info) -{ - void (*post_doit)(__genl_const struct genl_ops *ops, - struct sk_buff *skb, - struct genl_info *info); - - post_doit = get_copy(ops)->real_family->post_doit; - - if (post_doit) - post_doit(ops, skb, info); - kfree(__bp_genl_info_userhdr(info)); -} - -int bp_extack_genl_register_family(struct genl_family *family) -{ - unsigned int size = sizeof(struct bp_extack_genl_family) + - sizeof(family->ops[0]) * (family->n_ops + 1); - struct bp_extack_genl_family *copy; - int i, err; - - copy = kzalloc(size, GFP_KERNEL); - if (!copy) - return -ENOMEM; - - copy->family = *family; - copy->real_family = family; - copy->family.ops = ©->ops[1]; - - for (i = 0; i < family->n_ops; i++) { - copy->ops[i + 1] = family->ops[i]; - if (family->ops[i].doit) - copy->ops[i + 1].doit = extack_doit; - } - - copy->ops[0].policy = extack_dummy_policy; - - copy->family.pre_doit = extack_pre_doit; - copy->family.post_doit = extack_post_doit; - - err = __real_bp_extack_genl_register_family(©->family); - if (err) { - kfree(copy); - return err; - } - - /* copy this since the family might access it directly */ - family->id = copy->family.id; - family->attrbuf = copy->family.attrbuf; - -#if LINUX_VERSION_IS_LESS(3,13,0) && RHEL_RELEASE_CODE < RHEL_RELEASE_VERSION(7,0) - /* family ID from the original family struct will be used when building - * genl messages (sent as nlmsg_type), so the new id should be updated - * in the original (older kernel format) family struct too - */ - family->family.id = copy->family.id; -#endif - -#if LINUX_VERSION_IS_GEQ(3,13,0) - family->mcgrp_offset = copy->family.mcgrp_offset; -#endif - - mutex_lock(&copies_mutex); - list_add_tail(©->list, &copies_list); - mutex_unlock(&copies_mutex); - - return 0; -} -EXPORT_SYMBOL_GPL(bp_extack_genl_register_family); - -int bp_extack_genl_unregister_family(struct genl_family *family) -{ - struct bp_extack_genl_family *tmp, *copy = NULL; - int err; - - mutex_lock(&copies_mutex); - list_for_each_entry(tmp, &copies_list, list) { - if (tmp->real_family == family) { - copy = tmp; - break; - } - } - if (copy) - list_del(©->list); - mutex_unlock(&copies_mutex); - - if (!copy) - return -ENOENT; - - err = __real_bp_extack_genl_unregister_family(©->family); - WARN_ON(err); - kfree(copy); - - return 0; -} -EXPORT_SYMBOL_GPL(bp_extack_genl_unregister_family); |