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-rw-r--r--net/sched/act_pedit.c627
1 files changed, 627 insertions, 0 deletions
diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
new file mode 100644
index 000000000..aee2e13f1
--- /dev/null
+++ b/net/sched/act_pedit.c
@@ -0,0 +1,627 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * net/sched/act_pedit.c Generic packet editor
+ *
+ * Authors: Jamal Hadi Salim (2002-4)
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/slab.h>
+#include <net/ipv6.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <linux/tc_act/tc_pedit.h>
+#include <net/tc_act/tc_pedit.h>
+#include <uapi/linux/tc_act/tc_pedit.h>
+#include <net/pkt_cls.h>
+
+static struct tc_action_ops act_pedit_ops;
+
+static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
+ [TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) },
+ [TCA_PEDIT_PARMS_EX] = { .len = sizeof(struct tc_pedit) },
+ [TCA_PEDIT_KEYS_EX] = { .type = NLA_NESTED },
+};
+
+static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
+ [TCA_PEDIT_KEY_EX_HTYPE] = { .type = NLA_U16 },
+ [TCA_PEDIT_KEY_EX_CMD] = { .type = NLA_U16 },
+};
+
+static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
+ u8 n)
+{
+ struct tcf_pedit_key_ex *keys_ex;
+ struct tcf_pedit_key_ex *k;
+ const struct nlattr *ka;
+ int err = -EINVAL;
+ int rem;
+
+ if (!nla)
+ return NULL;
+
+ keys_ex = kcalloc(n, sizeof(*k), GFP_KERNEL);
+ if (!keys_ex)
+ return ERR_PTR(-ENOMEM);
+
+ k = keys_ex;
+
+ nla_for_each_nested(ka, nla, rem) {
+ struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1];
+
+ if (!n) {
+ err = -EINVAL;
+ goto err_out;
+ }
+ n--;
+
+ if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
+ err = -EINVAL;
+ goto err_out;
+ }
+
+ err = nla_parse_nested_deprecated(tb, TCA_PEDIT_KEY_EX_MAX,
+ ka, pedit_key_ex_policy,
+ NULL);
+ if (err)
+ goto err_out;
+
+ if (!tb[TCA_PEDIT_KEY_EX_HTYPE] ||
+ !tb[TCA_PEDIT_KEY_EX_CMD]) {
+ err = -EINVAL;
+ goto err_out;
+ }
+
+ k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]);
+ k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]);
+
+ if (k->htype > TCA_PEDIT_HDR_TYPE_MAX ||
+ k->cmd > TCA_PEDIT_CMD_MAX) {
+ err = -EINVAL;
+ goto err_out;
+ }
+
+ k++;
+ }
+
+ if (n) {
+ err = -EINVAL;
+ goto err_out;
+ }
+
+ return keys_ex;
+
+err_out:
+ kfree(keys_ex);
+ return ERR_PTR(err);
+}
+
+static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
+ struct tcf_pedit_key_ex *keys_ex, int n)
+{
+ struct nlattr *keys_start = nla_nest_start_noflag(skb,
+ TCA_PEDIT_KEYS_EX);
+
+ if (!keys_start)
+ goto nla_failure;
+ for (; n > 0; n--) {
+ struct nlattr *key_start;
+
+ key_start = nla_nest_start_noflag(skb, TCA_PEDIT_KEY_EX);
+ if (!key_start)
+ goto nla_failure;
+
+ if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) ||
+ nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd))
+ goto nla_failure;
+
+ nla_nest_end(skb, key_start);
+
+ keys_ex++;
+ }
+
+ nla_nest_end(skb, keys_start);
+
+ return 0;
+nla_failure:
+ nla_nest_cancel(skb, keys_start);
+ return -EINVAL;
+}
+
+static void tcf_pedit_cleanup_rcu(struct rcu_head *head)
+{
+ struct tcf_pedit_parms *parms =
+ container_of(head, struct tcf_pedit_parms, rcu);
+
+ kfree(parms->tcfp_keys_ex);
+ kfree(parms->tcfp_keys);
+
+ kfree(parms);
+}
+
+static int tcf_pedit_init(struct net *net, struct nlattr *nla,
+ struct nlattr *est, struct tc_action **a,
+ struct tcf_proto *tp, u32 flags,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_action_net *tn = net_generic(net, act_pedit_ops.net_id);
+ bool bind = flags & TCA_ACT_FLAGS_BIND;
+ struct tcf_chain *goto_ch = NULL;
+ struct tcf_pedit_parms *oparms, *nparms;
+ struct nlattr *tb[TCA_PEDIT_MAX + 1];
+ struct tc_pedit *parm;
+ struct nlattr *pattr;
+ struct tcf_pedit *p;
+ int ret = 0, err;
+ int i, ksize;
+ u32 index;
+
+ if (!nla) {
+ NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed");
+ return -EINVAL;
+ }
+
+ err = nla_parse_nested_deprecated(tb, TCA_PEDIT_MAX, nla,
+ pedit_policy, NULL);
+ if (err < 0)
+ return err;
+
+ pattr = tb[TCA_PEDIT_PARMS];
+ if (!pattr)
+ pattr = tb[TCA_PEDIT_PARMS_EX];
+ if (!pattr) {
+ NL_SET_ERR_MSG_MOD(extack, "Missing required TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute");
+ return -EINVAL;
+ }
+
+ parm = nla_data(pattr);
+
+ index = parm->index;
+ err = tcf_idr_check_alloc(tn, &index, a, bind);
+ if (!err) {
+ ret = tcf_idr_create_from_flags(tn, index, est, a,
+ &act_pedit_ops, bind, flags);
+ if (ret) {
+ tcf_idr_cleanup(tn, index);
+ return ret;
+ }
+ ret = ACT_P_CREATED;
+ } else if (err > 0) {
+ if (bind)
+ return 0;
+ if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
+ ret = -EEXIST;
+ goto out_release;
+ }
+ } else {
+ return err;
+ }
+
+ if (!parm->nkeys) {
+ NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed");
+ ret = -EINVAL;
+ goto out_release;
+ }
+ ksize = parm->nkeys * sizeof(struct tc_pedit_key);
+ if (nla_len(pattr) < sizeof(*parm) + ksize) {
+ NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid");
+ ret = -EINVAL;
+ goto out_release;
+ }
+
+ nparms = kzalloc(sizeof(*nparms), GFP_KERNEL);
+ if (!nparms) {
+ ret = -ENOMEM;
+ goto out_release;
+ }
+
+ nparms->tcfp_keys_ex =
+ tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
+ if (IS_ERR(nparms->tcfp_keys_ex)) {
+ ret = PTR_ERR(nparms->tcfp_keys_ex);
+ goto out_free;
+ }
+
+ err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
+ if (err < 0) {
+ ret = err;
+ goto out_free_ex;
+ }
+
+ nparms->tcfp_off_max_hint = 0;
+ nparms->tcfp_flags = parm->flags;
+ nparms->tcfp_nkeys = parm->nkeys;
+
+ nparms->tcfp_keys = kmalloc(ksize, GFP_KERNEL);
+ if (!nparms->tcfp_keys) {
+ ret = -ENOMEM;
+ goto put_chain;
+ }
+
+ memcpy(nparms->tcfp_keys, parm->keys, ksize);
+
+ for (i = 0; i < nparms->tcfp_nkeys; ++i) {
+ u32 cur = nparms->tcfp_keys[i].off;
+
+ /* sanitize the shift value for any later use */
+ nparms->tcfp_keys[i].shift = min_t(size_t,
+ BITS_PER_TYPE(int) - 1,
+ nparms->tcfp_keys[i].shift);
+
+ /* The AT option can read a single byte, we can bound the actual
+ * value with uchar max.
+ */
+ cur += (0xff & nparms->tcfp_keys[i].offmask) >> nparms->tcfp_keys[i].shift;
+
+ /* Each key touches 4 bytes starting from the computed offset */
+ nparms->tcfp_off_max_hint =
+ max(nparms->tcfp_off_max_hint, cur + 4);
+ }
+
+ p = to_pedit(*a);
+
+ spin_lock_bh(&p->tcf_lock);
+ goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
+ oparms = rcu_replace_pointer(p->parms, nparms, 1);
+ spin_unlock_bh(&p->tcf_lock);
+
+ if (oparms)
+ call_rcu(&oparms->rcu, tcf_pedit_cleanup_rcu);
+
+ if (goto_ch)
+ tcf_chain_put_by_act(goto_ch);
+
+ return ret;
+
+put_chain:
+ if (goto_ch)
+ tcf_chain_put_by_act(goto_ch);
+out_free_ex:
+ kfree(nparms->tcfp_keys_ex);
+out_free:
+ kfree(nparms);
+out_release:
+ tcf_idr_release(*a, bind);
+ return ret;
+}
+
+static void tcf_pedit_cleanup(struct tc_action *a)
+{
+ struct tcf_pedit *p = to_pedit(a);
+ struct tcf_pedit_parms *parms;
+
+ parms = rcu_dereference_protected(p->parms, 1);
+
+ if (parms)
+ call_rcu(&parms->rcu, tcf_pedit_cleanup_rcu);
+}
+
+static bool offset_valid(struct sk_buff *skb, int offset)
+{
+ if (offset > 0 && offset > skb->len)
+ return false;
+
+ if (offset < 0 && -offset > skb_headroom(skb))
+ return false;
+
+ return true;
+}
+
+static int pedit_l4_skb_offset(struct sk_buff *skb, int *hoffset, const int header_type)
+{
+ const int noff = skb_network_offset(skb);
+ int ret = -EINVAL;
+ struct iphdr _iph;
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP): {
+ const struct iphdr *iph = skb_header_pointer(skb, noff, sizeof(_iph), &_iph);
+
+ if (!iph)
+ goto out;
+ *hoffset = noff + iph->ihl * 4;
+ ret = 0;
+ break;
+ }
+ case htons(ETH_P_IPV6):
+ ret = ipv6_find_hdr(skb, hoffset, header_type, NULL, NULL) == header_type ? 0 : -EINVAL;
+ break;
+ }
+out:
+ return ret;
+}
+
+static int pedit_skb_hdr_offset(struct sk_buff *skb,
+ enum pedit_header_type htype, int *hoffset)
+{
+ int ret = -EINVAL;
+ /* 'htype' is validated in the netlink parsing */
+ switch (htype) {
+ case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
+ if (skb_mac_header_was_set(skb)) {
+ *hoffset = skb_mac_offset(skb);
+ ret = 0;
+ }
+ break;
+ case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK:
+ case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
+ case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
+ *hoffset = skb_network_offset(skb);
+ ret = 0;
+ break;
+ case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
+ ret = pedit_l4_skb_offset(skb, hoffset, IPPROTO_TCP);
+ break;
+ case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
+ ret = pedit_l4_skb_offset(skb, hoffset, IPPROTO_UDP);
+ break;
+ default:
+ break;
+ }
+ return ret;
+}
+
+static int tcf_pedit_act(struct sk_buff *skb, const struct tc_action *a,
+ struct tcf_result *res)
+{
+ enum pedit_header_type htype = TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
+ enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
+ struct tcf_pedit *p = to_pedit(a);
+ struct tcf_pedit_key_ex *tkey_ex;
+ struct tcf_pedit_parms *parms;
+ struct tc_pedit_key *tkey;
+ u32 max_offset;
+ int i;
+
+ parms = rcu_dereference_bh(p->parms);
+
+ max_offset = (skb_transport_header_was_set(skb) ?
+ skb_transport_offset(skb) :
+ skb_network_offset(skb)) +
+ parms->tcfp_off_max_hint;
+ if (skb_ensure_writable(skb, min(skb->len, max_offset)))
+ goto done;
+
+ tcf_lastuse_update(&p->tcf_tm);
+ tcf_action_update_bstats(&p->common, skb);
+
+ tkey = parms->tcfp_keys;
+ tkey_ex = parms->tcfp_keys_ex;
+
+ for (i = parms->tcfp_nkeys; i > 0; i--, tkey++) {
+ int offset = tkey->off;
+ int hoffset = 0;
+ u32 *ptr, hdata;
+ u32 val;
+ int rc;
+
+ if (tkey_ex) {
+ htype = tkey_ex->htype;
+ cmd = tkey_ex->cmd;
+
+ tkey_ex++;
+ }
+
+ rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
+ if (rc) {
+ pr_info_ratelimited("tc action pedit unable to extract header offset for header type (0x%x)\n", htype);
+ goto bad;
+ }
+
+ if (tkey->offmask) {
+ u8 *d, _d;
+
+ if (!offset_valid(skb, hoffset + tkey->at)) {
+ pr_info("tc action pedit 'at' offset %d out of bounds\n",
+ hoffset + tkey->at);
+ goto bad;
+ }
+ d = skb_header_pointer(skb, hoffset + tkey->at,
+ sizeof(_d), &_d);
+ if (!d)
+ goto bad;
+ offset += (*d & tkey->offmask) >> tkey->shift;
+ }
+
+ if (offset % 4) {
+ pr_info("tc action pedit offset must be on 32 bit boundaries\n");
+ goto bad;
+ }
+
+ if (!offset_valid(skb, hoffset + offset)) {
+ pr_info("tc action pedit offset %d out of bounds\n",
+ hoffset + offset);
+ goto bad;
+ }
+
+ ptr = skb_header_pointer(skb, hoffset + offset,
+ sizeof(hdata), &hdata);
+ if (!ptr)
+ goto bad;
+ /* just do it, baby */
+ switch (cmd) {
+ case TCA_PEDIT_KEY_EX_CMD_SET:
+ val = tkey->val;
+ break;
+ case TCA_PEDIT_KEY_EX_CMD_ADD:
+ val = (*ptr + tkey->val) & ~tkey->mask;
+ break;
+ default:
+ pr_info("tc action pedit bad command (%d)\n",
+ cmd);
+ goto bad;
+ }
+
+ *ptr = ((*ptr & tkey->mask) ^ val);
+ if (ptr == &hdata)
+ skb_store_bits(skb, hoffset + offset, ptr, 4);
+ }
+
+ goto done;
+
+bad:
+ spin_lock(&p->tcf_lock);
+ p->tcf_qstats.overlimits++;
+ spin_unlock(&p->tcf_lock);
+done:
+ return p->tcf_action;
+}
+
+static void tcf_pedit_stats_update(struct tc_action *a, u64 bytes, u64 packets,
+ u64 drops, u64 lastuse, bool hw)
+{
+ struct tcf_pedit *d = to_pedit(a);
+ struct tcf_t *tm = &d->tcf_tm;
+
+ tcf_action_update_stats(a, bytes, packets, drops, hw);
+ tm->lastuse = max_t(u64, tm->lastuse, lastuse);
+}
+
+static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
+ int bind, int ref)
+{
+ unsigned char *b = skb_tail_pointer(skb);
+ struct tcf_pedit *p = to_pedit(a);
+ struct tcf_pedit_parms *parms;
+ struct tc_pedit *opt;
+ struct tcf_t t;
+ int s;
+
+ spin_lock_bh(&p->tcf_lock);
+ parms = rcu_dereference_protected(p->parms, 1);
+ s = struct_size(opt, keys, parms->tcfp_nkeys);
+
+ opt = kzalloc(s, GFP_ATOMIC);
+ if (unlikely(!opt)) {
+ spin_unlock_bh(&p->tcf_lock);
+ return -ENOBUFS;
+ }
+
+ memcpy(opt->keys, parms->tcfp_keys,
+ flex_array_size(opt, keys, parms->tcfp_nkeys));
+ opt->index = p->tcf_index;
+ opt->nkeys = parms->tcfp_nkeys;
+ opt->flags = parms->tcfp_flags;
+ opt->action = p->tcf_action;
+ opt->refcnt = refcount_read(&p->tcf_refcnt) - ref;
+ opt->bindcnt = atomic_read(&p->tcf_bindcnt) - bind;
+
+ if (parms->tcfp_keys_ex) {
+ if (tcf_pedit_key_ex_dump(skb, parms->tcfp_keys_ex,
+ parms->tcfp_nkeys))
+ goto nla_put_failure;
+
+ if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt))
+ goto nla_put_failure;
+ } else {
+ if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
+ goto nla_put_failure;
+ }
+
+ tcf_tm_dump(&t, &p->tcf_tm);
+ if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))
+ goto nla_put_failure;
+ spin_unlock_bh(&p->tcf_lock);
+
+ kfree(opt);
+ return skb->len;
+
+nla_put_failure:
+ spin_unlock_bh(&p->tcf_lock);
+ nlmsg_trim(skb, b);
+ kfree(opt);
+ return -1;
+}
+
+static int tcf_pedit_offload_act_setup(struct tc_action *act, void *entry_data,
+ u32 *index_inc, bool bind,
+ struct netlink_ext_ack *extack)
+{
+ if (bind) {
+ struct flow_action_entry *entry = entry_data;
+ int k;
+
+ for (k = 0; k < tcf_pedit_nkeys(act); k++) {
+ switch (tcf_pedit_cmd(act, k)) {
+ case TCA_PEDIT_KEY_EX_CMD_SET:
+ entry->id = FLOW_ACTION_MANGLE;
+ break;
+ case TCA_PEDIT_KEY_EX_CMD_ADD:
+ entry->id = FLOW_ACTION_ADD;
+ break;
+ default:
+ NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
+ return -EOPNOTSUPP;
+ }
+ entry->mangle.htype = tcf_pedit_htype(act, k);
+ entry->mangle.mask = tcf_pedit_mask(act, k);
+ entry->mangle.val = tcf_pedit_val(act, k);
+ entry->mangle.offset = tcf_pedit_offset(act, k);
+ entry->hw_stats = tc_act_hw_stats(act->hw_stats);
+ entry++;
+ }
+ *index_inc = k;
+ } else {
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
+static struct tc_action_ops act_pedit_ops = {
+ .kind = "pedit",
+ .id = TCA_ID_PEDIT,
+ .owner = THIS_MODULE,
+ .act = tcf_pedit_act,
+ .stats_update = tcf_pedit_stats_update,
+ .dump = tcf_pedit_dump,
+ .cleanup = tcf_pedit_cleanup,
+ .init = tcf_pedit_init,
+ .offload_act_setup = tcf_pedit_offload_act_setup,
+ .size = sizeof(struct tcf_pedit),
+};
+
+static __net_init int pedit_init_net(struct net *net)
+{
+ struct tc_action_net *tn = net_generic(net, act_pedit_ops.net_id);
+
+ return tc_action_net_init(net, tn, &act_pedit_ops);
+}
+
+static void __net_exit pedit_exit_net(struct list_head *net_list)
+{
+ tc_action_net_exit(net_list, act_pedit_ops.net_id);
+}
+
+static struct pernet_operations pedit_net_ops = {
+ .init = pedit_init_net,
+ .exit_batch = pedit_exit_net,
+ .id = &act_pedit_ops.net_id,
+ .size = sizeof(struct tc_action_net),
+};
+
+MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
+MODULE_DESCRIPTION("Generic Packet Editor actions");
+MODULE_LICENSE("GPL");
+
+static int __init pedit_init_module(void)
+{
+ return tcf_register_action(&act_pedit_ops, &pedit_net_ops);
+}
+
+static void __exit pedit_cleanup_module(void)
+{
+ tcf_unregister_action(&act_pedit_ops, &pedit_net_ops);
+}
+
+module_init(pedit_init_module);
+module_exit(pedit_cleanup_module);