[linux-2.6-block.git] / net / sched / act_csum.c

/*
 * Checksum updating actions
 *
 * Copyright (c) 2010 Gregoire Baron <baronchon@n7mm.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>

#include <linux/netlink.h>
#include <net/netlink.h>
#include <linux/rtnetlink.h>

#include <linux/skbuff.h>

#include <net/ip.h>
#include <net/ipv6.h>
#include <net/icmp.h>
#include <linux/icmpv6.h>
#include <linux/igmp.h>
#include <net/tcp.h>
#include <net/udp.h>
#include <net/ip6_checksum.h>
#include <net/sctp/checksum.h>

#include <net/act_api.h>

#include <linux/tc_act/tc_csum.h>
#include <net/tc_act/tc_csum.h>

static const struct nla_policy csum_policy[TCA_CSUM_MAX + 1] = {
	[TCA_CSUM_PARMS] = { .len = sizeof(struct tc_csum), },
};

static unsigned int csum_net_id;
static struct tc_action_ops act_csum_ops;

static int tcf_csum_init(struct net *net, struct nlattr *nla,
			 struct nlattr *est, struct tc_action **a, int ovr,
			 int bind, bool rtnl_held,
			 struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, csum_net_id);
	struct tcf_csum_params *params_new;
	struct nlattr *tb[TCA_CSUM_MAX + 1];
	struct tc_csum *parm;
	struct tcf_csum *p;
	int ret = 0, err;

	if (nla == NULL)
		return -EINVAL;

	err = nla_parse_nested(tb, TCA_CSUM_MAX, nla, csum_policy, NULL);
	if (err < 0)
		return err;

	if (tb[TCA_CSUM_PARMS] == NULL)
		return -EINVAL;
	parm = nla_data(tb[TCA_CSUM_PARMS]);

	err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
	if (!err) {
		ret = tcf_idr_create(tn, parm->index, est, a,
				     &act_csum_ops, bind, true);
		if (ret) {
			tcf_idr_cleanup(tn, parm->index);
			return ret;
		}
		ret = ACT_P_CREATED;
	} else if (err > 0) {
		if (bind)/* dont override defaults */
			return 0;
		if (!ovr) {
			tcf_idr_release(*a, bind);
			return -EEXIST;
		}
	} else {
		return err;
	}

	p = to_tcf_csum(*a);

	params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
	if (unlikely(!params_new)) {
		tcf_idr_release(*a, bind);
		return -ENOMEM;
	}
	params_new->update_flags = parm->update_flags;

	spin_lock_bh(&p->tcf_lock);
	p->tcf_action = parm->action;
	rcu_swap_protected(p->params, params_new,
			   lockdep_is_held(&p->tcf_lock));
	spin_unlock_bh(&p->tcf_lock);

	if (params_new)
		kfree_rcu(params_new, rcu);

	if (ret == ACT_P_CREATED)
		tcf_idr_insert(tn, *a);

	return ret;
}

/**
 * tcf_csum_skb_nextlayer - Get next layer pointer
 * @skb: sk_buff to use
 * @ihl: previous summed headers length
 * @ipl: complete packet length
 * @jhl: next header length
 *
 * Check the expected next layer availability in the specified sk_buff.
 * Return the next layer pointer if pass, NULL otherwise.
 */
static void *tcf_csum_skb_nextlayer(struct sk_buff *skb,
				    unsigned int ihl, unsigned int ipl,
				    unsigned int jhl)
{
	int ntkoff = skb_network_offset(skb);
	int hl = ihl + jhl;

	if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) ||
	    skb_try_make_writable(skb, hl + ntkoff))
		return NULL;
	else
		return (void *)(skb_network_header(skb) + ihl);
}

static int tcf_csum_ipv4_icmp(struct sk_buff *skb, unsigned int ihl,
			      unsigned int ipl)
{
	struct icmphdr *icmph;

	icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph));
	if (icmph == NULL)
		return 0;

	icmph->checksum = 0;
	skb->csum = csum_partial(icmph, ipl - ihl, 0);
	icmph->checksum = csum_fold(skb->csum);

	skb->ip_summed = CHECKSUM_NONE;

	return 1;
}

static int tcf_csum_ipv4_igmp(struct sk_buff *skb,
			      unsigned int ihl, unsigned int ipl)
{
	struct igmphdr *igmph;

	igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph));
	if (igmph == NULL)
		return 0;

	igmph->csum = 0;
	skb->csum = csum_partial(igmph, ipl - ihl, 0);
	igmph->csum = csum_fold(skb->csum);

	skb->ip_summed = CHECKSUM_NONE;

	return 1;
}

static int tcf_csum_ipv6_icmp(struct sk_buff *skb, unsigned int ihl,
			      unsigned int ipl)
{
	struct icmp6hdr *icmp6h;
	const struct ipv6hdr *ip6h;

	icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h));
	if (icmp6h == NULL)
		return 0;

	ip6h = ipv6_hdr(skb);
	icmp6h->icmp6_cksum = 0;
	skb->csum = csum_partial(icmp6h, ipl - ihl, 0);
	icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
					      ipl - ihl, IPPROTO_ICMPV6,
					      skb->csum);

	skb->ip_summed = CHECKSUM_NONE;

	return 1;
}

static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl,
			     unsigned int ipl)
{
	struct tcphdr *tcph;
	const struct iphdr *iph;

	if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
		return 1;

	tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
	if (tcph == NULL)
		return 0;

	iph = ip_hdr(skb);
	tcph->check = 0;
	skb->csum = csum_partial(tcph, ipl - ihl, 0);
	tcph->check = tcp_v4_check(ipl - ihl,
				   iph->saddr, iph->daddr, skb->csum);

	skb->ip_summed = CHECKSUM_NONE;

	return 1;
}

static int tcf_csum_ipv6_tcp(struct sk_buff *skb, unsigned int ihl,
			     unsigned int ipl)
{
	struct tcphdr *tcph;
	const struct ipv6hdr *ip6h;

	if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
		return 1;

	tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
	if (tcph == NULL)
		return 0;

	ip6h = ipv6_hdr(skb);
	tcph->check = 0;
	skb->csum = csum_partial(tcph, ipl - ihl, 0);
	tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
				      ipl - ihl, IPPROTO_TCP,
				      skb->csum);

	skb->ip_summed = CHECKSUM_NONE;

	return 1;
}

static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl,
			     unsigned int ipl, int udplite)
{
	struct udphdr *udph;
	const struct iphdr *iph;
	u16 ul;

	if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
		return 1;

	/*
	 * Support both UDP and UDPLITE checksum algorithms, Don't use
	 * udph->len to get the real length without any protocol check,
	 * UDPLITE uses udph->len for another thing,
	 * Use iph->tot_len, or just ipl.
	 */

	udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
	if (udph == NULL)
		return 0;

	iph = ip_hdr(skb);
	ul = ntohs(udph->len);

	if (udplite || udph->check) {

		udph->check = 0;

		if (udplite) {
			if (ul == 0)
				skb->csum = csum_partial(udph, ipl - ihl, 0);
			else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
				skb->csum = csum_partial(udph, ul, 0);
			else
				goto ignore_obscure_skb;
		} else {
			if (ul != ipl - ihl)
				goto ignore_obscure_skb;

			skb->csum = csum_partial(udph, ul, 0);
		}

		udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
						ul, iph->protocol,
						skb->csum);

		if (!udph->check)
			udph->check = CSUM_MANGLED_0;
	}

	skb->ip_summed = CHECKSUM_NONE;

ignore_obscure_skb:
	return 1;
}

static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl,
			     unsigned int ipl, int udplite)
{
	struct udphdr *udph;
	const struct ipv6hdr *ip6h;
	u16 ul;

	if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
		return 1;

	/*
	 * Support both UDP and UDPLITE checksum algorithms, Don't use
	 * udph->len to get the real length without any protocol check,
	 * UDPLITE uses udph->len for another thing,
	 * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl.
	 */

	udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
	if (udph == NULL)
		return 0;

	ip6h = ipv6_hdr(skb);
	ul = ntohs(udph->len);

	udph->check = 0;

	if (udplite) {
		if (ul == 0)
			skb->csum = csum_partial(udph, ipl - ihl, 0);

		else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
			skb->csum = csum_partial(udph, ul, 0);

		else
			goto ignore_obscure_skb;
	} else {
		if (ul != ipl - ihl)
			goto ignore_obscure_skb;

		skb->csum = csum_partial(udph, ul, 0);
	}

	udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul,
				      udplite ? IPPROTO_UDPLITE : IPPROTO_UDP,
				      skb->csum);

	if (!udph->check)
		udph->check = CSUM_MANGLED_0;

	skb->ip_summed = CHECKSUM_NONE;

ignore_obscure_skb:
	return 1;
}

static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl,
			 unsigned int ipl)
{
	struct sctphdr *sctph;

	if (skb_is_gso(skb) && skb_is_gso_sctp(skb))
		return 1;

	sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph));
	if (!sctph)
		return 0;

	sctph->checksum = sctp_compute_cksum(skb,
					     skb_network_offset(skb) + ihl);
	skb->ip_summed = CHECKSUM_NONE;
	skb->csum_not_inet = 0;

	return 1;
}

static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags)
{
	const struct iphdr *iph;
	int ntkoff;

	ntkoff = skb_network_offset(skb);

	if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff))
		goto fail;

	iph = ip_hdr(skb);

	switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) {
	case IPPROTO_ICMP:
		if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
			if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4,
						ntohs(iph->tot_len)))
				goto fail;
		break;
	case IPPROTO_IGMP:
		if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP)
			if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4,
						ntohs(iph->tot_len)))
				goto fail;
		break;
	case IPPROTO_TCP:
		if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
			if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4,
					       ntohs(iph->tot_len)))
				goto fail;
		break;
	case IPPROTO_UDP:
		if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
			if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4,
					       ntohs(iph->tot_len), 0))
				goto fail;
		break;
	case IPPROTO_UDPLITE:
		if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
			if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4,
					       ntohs(iph->tot_len), 1))
				goto fail;
		break;
	case IPPROTO_SCTP:
		if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
		    !tcf_csum_sctp(skb, iph->ihl * 4, ntohs(iph->tot_len)))
			goto fail;
		break;
	}

	if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) {
		if (skb_try_make_writable(skb, sizeof(*iph) + ntkoff))
			goto fail;

		ip_send_check(ip_hdr(skb));
	}

	return 1;

fail:
	return 0;
}

static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, unsigned int ixhl,
				 unsigned int *pl)
{
	int off, len, optlen;
	unsigned char *xh = (void *)ip6xh;

	off = sizeof(*ip6xh);
	len = ixhl - off;

	while (len > 1) {
		switch (xh[off]) {
		case IPV6_TLV_PAD1:
			optlen = 1;
			break;
		case IPV6_TLV_JUMBO:
			optlen = xh[off + 1] + 2;
			if (optlen != 6 || len < 6 || (off & 3) != 2)
				/* wrong jumbo option length/alignment */
				return 0;
			*pl = ntohl(*(__be32 *)(xh + off + 2));
			goto done;
		default:
			optlen = xh[off + 1] + 2;
			if (optlen > len)
				/* ignore obscure options */
				goto done;
			break;
		}
		off += optlen;
		len -= optlen;
	}

done:
	return 1;
}

static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags)
{
	struct ipv6hdr *ip6h;
	struct ipv6_opt_hdr *ip6xh;
	unsigned int hl, ixhl;
	unsigned int pl;
	int ntkoff;
	u8 nexthdr;

	ntkoff = skb_network_offset(skb);

	hl = sizeof(*ip6h);

	if (!pskb_may_pull(skb, hl + ntkoff))
		goto fail;

	ip6h = ipv6_hdr(skb);

	pl = ntohs(ip6h->payload_len);
	nexthdr = ip6h->nexthdr;

	do {
		switch (nexthdr) {
		case NEXTHDR_FRAGMENT:
			goto ignore_skb;
		case NEXTHDR_ROUTING:
		case NEXTHDR_HOP:
		case NEXTHDR_DEST:
			if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff))
				goto fail;
			ip6xh = (void *)(skb_network_header(skb) + hl);
			ixhl = ipv6_optlen(ip6xh);
			if (!pskb_may_pull(skb, hl + ixhl + ntkoff))
				goto fail;
			ip6xh = (void *)(skb_network_header(skb) + hl);
			if ((nexthdr == NEXTHDR_HOP) &&
			    !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl)))
				goto fail;
			nexthdr = ip6xh->nexthdr;
			hl += ixhl;
			break;
		case IPPROTO_ICMPV6:
			if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
				if (!tcf_csum_ipv6_icmp(skb,
							hl, pl + sizeof(*ip6h)))
					goto fail;
			goto done;
		case IPPROTO_TCP:
			if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
				if (!tcf_csum_ipv6_tcp(skb,
						       hl, pl + sizeof(*ip6h)))
					goto fail;
			goto done;
		case IPPROTO_UDP:
			if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
				if (!tcf_csum_ipv6_udp(skb, hl,
						       pl + sizeof(*ip6h), 0))
					goto fail;
			goto done;
		case IPPROTO_UDPLITE:
			if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
				if (!tcf_csum_ipv6_udp(skb, hl,
						       pl + sizeof(*ip6h), 1))
					goto fail;
			goto done;
		case IPPROTO_SCTP:
			if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
			    !tcf_csum_sctp(skb, hl, pl + sizeof(*ip6h)))
				goto fail;
			goto done;
		default:
			goto ignore_skb;
		}
	} while (pskb_may_pull(skb, hl + 1 + ntkoff));

done:
ignore_skb:
	return 1;

fail:
	return 0;
}

static int tcf_csum_act(struct sk_buff *skb, const struct tc_action *a,
			struct tcf_result *res)
{
	struct tcf_csum *p = to_tcf_csum(a);
	struct tcf_csum_params *params;
	u32 update_flags;
	int action;

	params = rcu_dereference_bh(p->params);

	tcf_lastuse_update(&p->tcf_tm);
	bstats_cpu_update(this_cpu_ptr(p->common.cpu_bstats), skb);

	action = READ_ONCE(p->tcf_action);
	if (unlikely(action == TC_ACT_SHOT))
		goto drop;

	update_flags = params->update_flags;
	switch (tc_skb_protocol(skb)) {
	case cpu_to_be16(ETH_P_IP):
		if (!tcf_csum_ipv4(skb, update_flags))
			goto drop;
		break;
	case cpu_to_be16(ETH_P_IPV6):
		if (!tcf_csum_ipv6(skb, update_flags))
			goto drop;
		break;
	}

	return action;

drop:
	qstats_drop_inc(this_cpu_ptr(p->common.cpu_qstats));
	return TC_ACT_SHOT;
}

static int tcf_csum_dump(struct sk_buff *skb, struct tc_action *a, int bind,
			 int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_csum *p = to_tcf_csum(a);
	struct tcf_csum_params *params;
	struct tc_csum opt = {
		.index   = p->tcf_index,
		.refcnt  = refcount_read(&p->tcf_refcnt) - ref,
		.bindcnt = atomic_read(&p->tcf_bindcnt) - bind,
	};
	struct tcf_t t;

	spin_lock_bh(&p->tcf_lock);
	params = rcu_dereference_protected(p->params,
					   lockdep_is_held(&p->tcf_lock));
	opt.action = p->tcf_action;
	opt.update_flags = params->update_flags;

	if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt))
		goto nla_put_failure;

	tcf_tm_dump(&t, &p->tcf_tm);
	if (nla_put_64bit(skb, TCA_CSUM_TM, sizeof(t), &t, TCA_CSUM_PAD))
		goto nla_put_failure;
	spin_unlock_bh(&p->tcf_lock);

	return skb->len;

nla_put_failure:
	spin_unlock_bh(&p->tcf_lock);
	nlmsg_trim(skb, b);
	return -1;
}

static void tcf_csum_cleanup(struct tc_action *a)
{
	struct tcf_csum *p = to_tcf_csum(a);
	struct tcf_csum_params *params;

	params = rcu_dereference_protected(p->params, 1);
	if (params)
		kfree_rcu(params, rcu);
}

static int tcf_csum_walker(struct net *net, struct sk_buff *skb,
			   struct netlink_callback *cb, int type,
			   const struct tc_action_ops *ops,
			   struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, csum_net_id);

	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
}

static int tcf_csum_search(struct net *net, struct tc_action **a, u32 index,
			   struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, csum_net_id);

	return tcf_idr_search(tn, a, index);
}

static size_t tcf_csum_get_fill_size(const struct tc_action *act)
{
	return nla_total_size(sizeof(struct tc_csum));
}

static struct tc_action_ops act_csum_ops = {
	.kind		= "csum",
	.type		= TCA_ACT_CSUM,
	.owner		= THIS_MODULE,
	.act		= tcf_csum_act,
	.dump		= tcf_csum_dump,
	.init		= tcf_csum_init,
	.cleanup	= tcf_csum_cleanup,
	.walk		= tcf_csum_walker,
	.lookup		= tcf_csum_search,
	.get_fill_size  = tcf_csum_get_fill_size,
	.size		= sizeof(struct tcf_csum),
};

static __net_init int csum_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, csum_net_id);

	return tc_action_net_init(tn, &act_csum_ops);
}

static void __net_exit csum_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, csum_net_id);
}

static struct pernet_operations csum_net_ops = {
	.init = csum_init_net,
	.exit_batch = csum_exit_net,
	.id   = &csum_net_id,
	.size = sizeof(struct tc_action_net),
};

MODULE_DESCRIPTION("Checksum updating actions");
MODULE_LICENSE("GPL");

static int __init csum_init_module(void)
{
	return tcf_register_action(&act_csum_ops, &csum_net_ops);
}

static void __exit csum_cleanup_module(void)
{
	tcf_unregister_action(&act_csum_ops, &csum_net_ops);
}

module_init(csum_init_module);
module_exit(csum_cleanup_module);
Commit	Line	Data
eb4d4065 GB	1	/*
	2	* Checksum updating actions
	3	*
	4	* Copyright (c) 2010 Gregoire Baron <baronchon@n7mm.org>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the Free
	8	* Software Foundation; either version 2 of the License, or (at your option)
	9	* any later version.
	10	*
	11	*/
	12
	13	#include <linux/types.h>
	14	#include <linux/init.h>
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/spinlock.h>
	18
	19	#include <linux/netlink.h>
	20	#include <net/netlink.h>
	21	#include <linux/rtnetlink.h>
	22
	23	#include <linux/skbuff.h>
	24
	25	#include <net/ip.h>
	26	#include <net/ipv6.h>
	27	#include <net/icmp.h>
	28	#include <linux/icmpv6.h>
	29	#include <linux/igmp.h>
	30	#include <net/tcp.h>
	31	#include <net/udp.h>
2436243a	32	#include <net/ip6_checksum.h>
c008b33f	33	#include <net/sctp/checksum.h>
eb4d4065 GB	34
	35	#include <net/act_api.h>
	36
	37	#include <linux/tc_act/tc_csum.h>
	38	#include <net/tc_act/tc_csum.h>
	39
eb4d4065 GB	40	static const struct nla_policy csum_policy[TCA_CSUM_MAX + 1] = {
	41	[TCA_CSUM_PARMS] = { .len = sizeof(struct tc_csum), },
	42	};
	43
c7d03a00	44	static unsigned int csum_net_id;
a85a970a	45	static struct tc_action_ops act_csum_ops;
ddf97ccd WC	46
ddf97ccd WC	47	static int tcf_csum_init(struct net net, struct nlattr nla,
a85a970a	48	struct nlattr est, struct tc_action *a, int ovr,
789871bb VB	49	int bind, bool rtnl_held,
789871bb VB	50	struct netlink_ext_ack *extack)
eb4d4065	51	{
ddf97ccd	52	struct tc_action_net *tn = net_generic(net, csum_net_id);
b6a2b971	53	struct tcf_csum_params *params_new;
eb4d4065 GB	54	struct nlattr *tb[TCA_CSUM_MAX + 1];
eb4d4065 GB	55	struct tc_csum *parm;
eb4d4065 GB	56	struct tcf_csum *p;
	57	int ret = 0, err;
	58
	59	if (nla == NULL)
	60	return -EINVAL;
	61
fceb6435	62	err = nla_parse_nested(tb, TCA_CSUM_MAX, nla, csum_policy, NULL);
eb4d4065 GB	63	if (err < 0)
	64	return err;
	65
	66	if (tb[TCA_CSUM_PARMS] == NULL)
	67	return -EINVAL;
	68	parm = nla_data(tb[TCA_CSUM_PARMS]);
	69
0190c1d4 VB	70	err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
0190c1d4 VB	71	if (!err) {
65a206c0	72	ret = tcf_idr_create(tn, parm->index, est, a,
f6052cf2	73	&act_csum_ops, bind, true);
0190c1d4 VB	74	if (ret) {
0190c1d4 VB	75	tcf_idr_cleanup(tn, parm->index);
86062033	76	return ret;
0190c1d4	77	}
eb4d4065	78	ret = ACT_P_CREATED;
0190c1d4	79	} else if (err > 0) {
1a29321e JHS	80	if (bind)/* dont override defaults */
1a29321e JHS	81	return 0;
4e8ddd7f VB	82	if (!ovr) {
4e8ddd7f VB	83	tcf_idr_release(*a, bind);
eb4d4065	84	return -EEXIST;
4e8ddd7f	85	}
0190c1d4 VB	86	} else {
0190c1d4 VB	87	return err;
eb4d4065 GB	88	}
eb4d4065 GB	89
a85a970a	90	p = to_tcf_csum(*a);
9c5f69bb DC	91
	92	params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
	93	if (unlikely(!params_new)) {
4e8ddd7f	94	tcf_idr_release(*a, bind);
9c5f69bb DC	95	return -ENOMEM;
9c5f69bb DC	96	}
b6a2b971	97	params_new->update_flags = parm->update_flags;
9c5f69bb	98
653cd284	99	spin_lock_bh(&p->tcf_lock);
11a245e2	100	p->tcf_action = parm->action;
b6a2b971 VB	101	rcu_swap_protected(p->params, params_new,
b6a2b971 VB	102	lockdep_is_held(&p->tcf_lock));
653cd284	103	spin_unlock_bh(&p->tcf_lock);
b6a2b971 VB	104
	105	if (params_new)
	106	kfree_rcu(params_new, rcu);
eb4d4065 GB	107
eb4d4065 GB	108	if (ret == ACT_P_CREATED)
65a206c0	109	tcf_idr_insert(tn, *a);
eb4d4065 GB	110
	111	return ret;
	112	}
	113
eb4d4065 GB	114	/**
	115	* tcf_csum_skb_nextlayer - Get next layer pointer
	116	* @skb: sk_buff to use
	117	* @ihl: previous summed headers length
	118	* @ipl: complete packet length
	119	* @jhl: next header length
	120	*
	121	* Check the expected next layer availability in the specified sk_buff.
	122	* Return the next layer pointer if pass, NULL otherwise.
	123	*/
	124	static void tcf_csum_skb_nextlayer(struct sk_buff skb,
	125	unsigned int ihl, unsigned int ipl,
	126	unsigned int jhl)
	127	{
	128	int ntkoff = skb_network_offset(skb);
	129	int hl = ihl + jhl;
	130
	131	if (!pskb_may_pull(skb, ipl + ntkoff) \|\| (ipl < hl) \|\|
3697649f	132	skb_try_make_writable(skb, hl + ntkoff))
eb4d4065 GB	133	return NULL;
	134	else
	135	return (void *)(skb_network_header(skb) + ihl);
	136	}
	137
5a7a5555 JHS	138	static int tcf_csum_ipv4_icmp(struct sk_buff *skb, unsigned int ihl,
5a7a5555 JHS	139	unsigned int ipl)
eb4d4065 GB	140	{
	141	struct icmphdr *icmph;
	142
	143	icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph));
	144	if (icmph == NULL)
	145	return 0;
	146
	147	icmph->checksum = 0;
	148	skb->csum = csum_partial(icmph, ipl - ihl, 0);
	149	icmph->checksum = csum_fold(skb->csum);
	150
	151	skb->ip_summed = CHECKSUM_NONE;
	152
	153	return 1;
	154	}
	155
	156	static int tcf_csum_ipv4_igmp(struct sk_buff *skb,
	157	unsigned int ihl, unsigned int ipl)
	158	{
	159	struct igmphdr *igmph;
	160
	161	igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph));
	162	if (igmph == NULL)
	163	return 0;
	164
	165	igmph->csum = 0;
	166	skb->csum = csum_partial(igmph, ipl - ihl, 0);
	167	igmph->csum = csum_fold(skb->csum);
	168
	169	skb->ip_summed = CHECKSUM_NONE;
	170
	171	return 1;
	172	}
	173
5a7a5555 JHS	174	static int tcf_csum_ipv6_icmp(struct sk_buff *skb, unsigned int ihl,
5a7a5555 JHS	175	unsigned int ipl)
eb4d4065 GB	176	{
eb4d4065 GB	177	struct icmp6hdr *icmp6h;
d14a489a	178	const struct ipv6hdr *ip6h;
eb4d4065 GB	179
	180	icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h));
	181	if (icmp6h == NULL)
	182	return 0;
	183
d14a489a	184	ip6h = ipv6_hdr(skb);
eb4d4065 GB	185	icmp6h->icmp6_cksum = 0;
	186	skb->csum = csum_partial(icmp6h, ipl - ihl, 0);
	187	icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
	188	ipl - ihl, IPPROTO_ICMPV6,
	189	skb->csum);
	190
	191	skb->ip_summed = CHECKSUM_NONE;
	192
	193	return 1;
	194	}
	195
5a7a5555 JHS	196	static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl,
5a7a5555 JHS	197	unsigned int ipl)
eb4d4065 GB	198	{
eb4d4065 GB	199	struct tcphdr *tcph;
d14a489a	200	const struct iphdr *iph;
eb4d4065	201
add641e7 DC	202	if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
	203	return 1;
	204
eb4d4065 GB	205	tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
	206	if (tcph == NULL)
	207	return 0;
	208
d14a489a	209	iph = ip_hdr(skb);
eb4d4065 GB	210	tcph->check = 0;
	211	skb->csum = csum_partial(tcph, ipl - ihl, 0);
	212	tcph->check = tcp_v4_check(ipl - ihl,
	213	iph->saddr, iph->daddr, skb->csum);
	214
	215	skb->ip_summed = CHECKSUM_NONE;
	216
	217	return 1;
	218	}
	219
5a7a5555 JHS	220	static int tcf_csum_ipv6_tcp(struct sk_buff *skb, unsigned int ihl,
5a7a5555 JHS	221	unsigned int ipl)
eb4d4065 GB	222	{
eb4d4065 GB	223	struct tcphdr *tcph;
d14a489a	224	const struct ipv6hdr *ip6h;
eb4d4065	225
add641e7 DC	226	if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
	227	return 1;
	228
eb4d4065 GB	229	tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
	230	if (tcph == NULL)
	231	return 0;
	232
d14a489a	233	ip6h = ipv6_hdr(skb);
eb4d4065 GB	234	tcph->check = 0;
	235	skb->csum = csum_partial(tcph, ipl - ihl, 0);
	236	tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
	237	ipl - ihl, IPPROTO_TCP,
	238	skb->csum);
	239
	240	skb->ip_summed = CHECKSUM_NONE;
	241
	242	return 1;
	243	}
	244
5a7a5555 JHS	245	static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl,
5a7a5555 JHS	246	unsigned int ipl, int udplite)
eb4d4065 GB	247	{
eb4d4065 GB	248	struct udphdr *udph;
d14a489a	249	const struct iphdr *iph;
eb4d4065 GB	250	u16 ul;
eb4d4065 GB	251
0c19f846 WB	252	if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
	253	return 1;
	254
0eec32ff CG	255	/*
	256	* Support both UDP and UDPLITE checksum algorithms, Don't use
	257	* udph->len to get the real length without any protocol check,
eb4d4065 GB	258	* UDPLITE uses udph->len for another thing,
	259	* Use iph->tot_len, or just ipl.
	260	*/
	261
	262	udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
	263	if (udph == NULL)
	264	return 0;
	265
d14a489a	266	iph = ip_hdr(skb);
eb4d4065 GB	267	ul = ntohs(udph->len);
	268
	269	if (udplite \|\| udph->check) {
	270
	271	udph->check = 0;
	272
	273	if (udplite) {
	274	if (ul == 0)
	275	skb->csum = csum_partial(udph, ipl - ihl, 0);
eb4d4065 GB	276	else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
eb4d4065 GB	277	skb->csum = csum_partial(udph, ul, 0);
eb4d4065 GB	278	else
	279	goto ignore_obscure_skb;
	280	} else {
	281	if (ul != ipl - ihl)
	282	goto ignore_obscure_skb;
	283
	284	skb->csum = csum_partial(udph, ul, 0);
	285	}
	286
	287	udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
	288	ul, iph->protocol,
	289	skb->csum);
	290
	291	if (!udph->check)
	292	udph->check = CSUM_MANGLED_0;
	293	}
	294
	295	skb->ip_summed = CHECKSUM_NONE;
	296
	297	ignore_obscure_skb:
	298	return 1;
	299	}
	300
5a7a5555 JHS	301	static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl,
5a7a5555 JHS	302	unsigned int ipl, int udplite)
eb4d4065 GB	303	{
eb4d4065 GB	304	struct udphdr *udph;
d14a489a	305	const struct ipv6hdr *ip6h;
eb4d4065 GB	306	u16 ul;
eb4d4065 GB	307
0c19f846 WB	308	if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
	309	return 1;
	310
0eec32ff CG	311	/*
	312	* Support both UDP and UDPLITE checksum algorithms, Don't use
	313	* udph->len to get the real length without any protocol check,
eb4d4065 GB	314	* UDPLITE uses udph->len for another thing,
	315	* Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl.
	316	*/
	317
	318	udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
	319	if (udph == NULL)
	320	return 0;
	321
d14a489a	322	ip6h = ipv6_hdr(skb);
eb4d4065 GB	323	ul = ntohs(udph->len);
	324
	325	udph->check = 0;
	326
	327	if (udplite) {
	328	if (ul == 0)
	329	skb->csum = csum_partial(udph, ipl - ihl, 0);
	330
	331	else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
	332	skb->csum = csum_partial(udph, ul, 0);
	333
	334	else
	335	goto ignore_obscure_skb;
	336	} else {
	337	if (ul != ipl - ihl)
	338	goto ignore_obscure_skb;
	339
	340	skb->csum = csum_partial(udph, ul, 0);
	341	}
	342
	343	udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul,
	344	udplite ? IPPROTO_UDPLITE : IPPROTO_UDP,
	345	skb->csum);
	346
	347	if (!udph->check)
	348	udph->check = CSUM_MANGLED_0;
	349
	350	skb->ip_summed = CHECKSUM_NONE;
	351
	352	ignore_obscure_skb:
	353	return 1;
	354	}
	355
c008b33f DC	356	static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl,
	357	unsigned int ipl)
	358	{
	359	struct sctphdr *sctph;
	360
1dd27cde	361	if (skb_is_gso(skb) && skb_is_gso_sctp(skb))
c008b33f DC	362	return 1;
	363
	364	sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph));
	365	if (!sctph)
	366	return 0;
	367
	368	sctph->checksum = sctp_compute_cksum(skb,
	369	skb_network_offset(skb) + ihl);
	370	skb->ip_summed = CHECKSUM_NONE;
dba00306	371	skb->csum_not_inet = 0;
c008b33f DC	372
	373	return 1;
	374	}
	375
eb4d4065 GB	376	static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags)
eb4d4065 GB	377	{
d14a489a	378	const struct iphdr *iph;
eb4d4065 GB	379	int ntkoff;
	380
	381	ntkoff = skb_network_offset(skb);
	382
	383	if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff))
	384	goto fail;
	385
	386	iph = ip_hdr(skb);
	387
	388	switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) {
	389	case IPPROTO_ICMP:
	390	if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
0eec32ff CG	391	if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4,
0eec32ff CG	392	ntohs(iph->tot_len)))
eb4d4065 GB	393	goto fail;
	394	break;
	395	case IPPROTO_IGMP:
	396	if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP)
0eec32ff CG	397	if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4,
0eec32ff CG	398	ntohs(iph->tot_len)))
eb4d4065 GB	399	goto fail;
	400	break;
	401	case IPPROTO_TCP:
	402	if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
d14a489a	403	if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4,
0eec32ff	404	ntohs(iph->tot_len)))
eb4d4065 GB	405	goto fail;
	406	break;
	407	case IPPROTO_UDP:
	408	if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
d14a489a	409	if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4,
0eec32ff	410	ntohs(iph->tot_len), 0))
eb4d4065 GB	411	goto fail;
	412	break;
	413	case IPPROTO_UDPLITE:
	414	if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
d14a489a	415	if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4,
0eec32ff	416	ntohs(iph->tot_len), 1))
eb4d4065 GB	417	goto fail;
eb4d4065 GB	418	break;
c008b33f DC	419	case IPPROTO_SCTP:
	420	if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
	421	!tcf_csum_sctp(skb, iph->ihl * 4, ntohs(iph->tot_len)))
	422	goto fail;
	423	break;
eb4d4065 GB	424	}
	425
	426	if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) {
3697649f	427	if (skb_try_make_writable(skb, sizeof(*iph) + ntkoff))
eb4d4065 GB	428	goto fail;
eb4d4065 GB	429
d14a489a	430	ip_send_check(ip_hdr(skb));
eb4d4065 GB	431	}
	432
	433	return 1;
	434
	435	fail:
	436	return 0;
	437	}
	438
5a7a5555 JHS	439	static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, unsigned int ixhl,
5a7a5555 JHS	440	unsigned int *pl)
eb4d4065 GB	441	{
	442	int off, len, optlen;
	443	unsigned char xh = (void )ip6xh;
	444
	445	off = sizeof(*ip6xh);
	446	len = ixhl - off;
	447
	448	while (len > 1) {
0eec32ff	449	switch (xh[off]) {
1de5a71c	450	case IPV6_TLV_PAD1:
eb4d4065 GB	451	optlen = 1;
	452	break;
	453	case IPV6_TLV_JUMBO:
	454	optlen = xh[off + 1] + 2;
	455	if (optlen != 6 \|\| len < 6 \|\| (off & 3) != 2)
	456	/* wrong jumbo option length/alignment */
	457	return 0;
	458	pl = ntohl((__be32 *)(xh + off + 2));
	459	goto done;
	460	default:
	461	optlen = xh[off + 1] + 2;
	462	if (optlen > len)
	463	/* ignore obscure options */
	464	goto done;
	465	break;
	466	}
	467	off += optlen;
	468	len -= optlen;
	469	}
	470
	471	done:
	472	return 1;
	473	}
	474
	475	static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags)
	476	{
	477	struct ipv6hdr *ip6h;
	478	struct ipv6_opt_hdr *ip6xh;
	479	unsigned int hl, ixhl;
	480	unsigned int pl;
	481	int ntkoff;
	482	u8 nexthdr;
	483
	484	ntkoff = skb_network_offset(skb);
	485
	486	hl = sizeof(*ip6h);
	487
	488	if (!pskb_may_pull(skb, hl + ntkoff))
	489	goto fail;
	490
	491	ip6h = ipv6_hdr(skb);
	492
	493	pl = ntohs(ip6h->payload_len);
	494	nexthdr = ip6h->nexthdr;
	495
	496	do {
	497	switch (nexthdr) {
	498	case NEXTHDR_FRAGMENT:
	499	goto ignore_skb;
	500	case NEXTHDR_ROUTING:
	501	case NEXTHDR_HOP:
	502	case NEXTHDR_DEST:
	503	if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff))
	504	goto fail;
	505	ip6xh = (void *)(skb_network_header(skb) + hl);
	506	ixhl = ipv6_optlen(ip6xh);
	507	if (!pskb_may_pull(skb, hl + ixhl + ntkoff))
	508	goto fail;
d14a489a	509	ip6xh = (void *)(skb_network_header(skb) + hl);
eb4d4065 GB	510	if ((nexthdr == NEXTHDR_HOP) &&
	511	!(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl)))
	512	goto fail;
	513	nexthdr = ip6xh->nexthdr;
	514	hl += ixhl;
	515	break;
	516	case IPPROTO_ICMPV6:
	517	if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
d14a489a	518	if (!tcf_csum_ipv6_icmp(skb,
eb4d4065 GB	519	hl, pl + sizeof(*ip6h)))
	520	goto fail;
	521	goto done;
	522	case IPPROTO_TCP:
	523	if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
d14a489a	524	if (!tcf_csum_ipv6_tcp(skb,
eb4d4065 GB	525	hl, pl + sizeof(*ip6h)))
	526	goto fail;
	527	goto done;
	528	case IPPROTO_UDP:
	529	if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
d14a489a	530	if (!tcf_csum_ipv6_udp(skb, hl,
0eec32ff	531	pl + sizeof(*ip6h), 0))
eb4d4065 GB	532	goto fail;
	533	goto done;
	534	case IPPROTO_UDPLITE:
	535	if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
d14a489a	536	if (!tcf_csum_ipv6_udp(skb, hl,
0eec32ff	537	pl + sizeof(*ip6h), 1))
eb4d4065 GB	538	goto fail;
eb4d4065 GB	539	goto done;
c008b33f DC	540	case IPPROTO_SCTP:
	541	if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
	542	!tcf_csum_sctp(skb, hl, pl + sizeof(*ip6h)))
	543	goto fail;
	544	goto done;
eb4d4065 GB	545	default:
	546	goto ignore_skb;
	547	}
	548	} while (pskb_may_pull(skb, hl + 1 + ntkoff));
	549
	550	done:
	551	ignore_skb:
	552	return 1;
	553
	554	fail:
	555	return 0;
	556	}
	557
c831549c JHS	558	static int tcf_csum_act(struct sk_buff skb, const struct tc_action a,
c831549c JHS	559	struct tcf_result *res)
eb4d4065	560	{
a85a970a	561	struct tcf_csum *p = to_tcf_csum(a);
9c5f69bb	562	struct tcf_csum_params *params;
eb4d4065	563	u32 update_flags;
9c5f69bb DC	564	int action;
9c5f69bb DC	565
7fd4b288	566	params = rcu_dereference_bh(p->params);
eb4d4065	567
9c4a4e48	568	tcf_lastuse_update(&p->tcf_tm);
f6052cf2	569	bstats_cpu_update(this_cpu_ptr(p->common.cpu_bstats), skb);
eb4d4065	570
11a245e2	571	action = READ_ONCE(p->tcf_action);
eb4d4065	572	if (unlikely(action == TC_ACT_SHOT))
7fd4b288	573	goto drop;
eb4d4065	574
9c5f69bb	575	update_flags = params->update_flags;
d8b9605d	576	switch (tc_skb_protocol(skb)) {
eb4d4065 GB	577	case cpu_to_be16(ETH_P_IP):
	578	if (!tcf_csum_ipv4(skb, update_flags))
	579	goto drop;
	580	break;
	581	case cpu_to_be16(ETH_P_IPV6):
	582	if (!tcf_csum_ipv6(skb, update_flags))
	583	goto drop;
	584	break;
	585	}
	586
	587	return action;
	588
	589	drop:
f6052cf2	590	qstats_drop_inc(this_cpu_ptr(p->common.cpu_qstats));
7fd4b288	591	return TC_ACT_SHOT;
eb4d4065 GB	592	}
eb4d4065 GB	593
5a7a5555 JHS	594	static int tcf_csum_dump(struct sk_buff skb, struct tc_action a, int bind,
5a7a5555 JHS	595	int ref)
eb4d4065 GB	596	{
eb4d4065 GB	597	unsigned char *b = skb_tail_pointer(skb);
a85a970a	598	struct tcf_csum *p = to_tcf_csum(a);
9c5f69bb	599	struct tcf_csum_params *params;
eb4d4065	600	struct tc_csum opt = {
eb4d4065	601	.index = p->tcf_index,
036bb443 VB	602	.refcnt = refcount_read(&p->tcf_refcnt) - ref,
036bb443 VB	603	.bindcnt = atomic_read(&p->tcf_bindcnt) - bind,
eb4d4065 GB	604	};
	605	struct tcf_t t;
	606
653cd284	607	spin_lock_bh(&p->tcf_lock);
b6a2b971 VB	608	params = rcu_dereference_protected(p->params,
	609	lockdep_is_held(&p->tcf_lock));
	610	opt.action = p->tcf_action;
9c5f69bb DC	611	opt.update_flags = params->update_flags;
9c5f69bb DC	612
1b34ec43 DM	613	if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt))
1b34ec43 DM	614	goto nla_put_failure;
48d8ee16 JHS	615
48d8ee16 JHS	616	tcf_tm_dump(&t, &p->tcf_tm);
9854518e	617	if (nla_put_64bit(skb, TCA_CSUM_TM, sizeof(t), &t, TCA_CSUM_PAD))
1b34ec43	618	goto nla_put_failure;
653cd284	619	spin_unlock_bh(&p->tcf_lock);
eb4d4065 GB	620
	621	return skb->len;
	622
	623	nla_put_failure:
653cd284	624	spin_unlock_bh(&p->tcf_lock);
eb4d4065 GB	625	nlmsg_trim(skb, b);
	626	return -1;
	627	}
	628
9c5f69bb DC	629	static void tcf_csum_cleanup(struct tc_action *a)
	630	{
	631	struct tcf_csum *p = to_tcf_csum(a);
	632	struct tcf_csum_params *params;
	633
	634	params = rcu_dereference_protected(p->params, 1);
aab378a7 DC	635	if (params)
aab378a7 DC	636	kfree_rcu(params, rcu);
9c5f69bb DC	637	}
9c5f69bb DC	638
ddf97ccd WC	639	static int tcf_csum_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	640	struct netlink_callback *cb, int type,
41780105 AA	641	const struct tc_action_ops *ops,
41780105 AA	642	struct netlink_ext_ack *extack)
ddf97ccd WC	643	{
	644	struct tc_action_net *tn = net_generic(net, csum_net_id);
	645
b3620145	646	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	647	}
ddf97ccd WC	648
331a9295 AA	649	static int tcf_csum_search(struct net net, struct tc_action *a, u32 index,
331a9295 AA	650	struct netlink_ext_ack *extack)
ddf97ccd WC	651	{
	652	struct tc_action_net *tn = net_generic(net, csum_net_id);
	653
65a206c0	654	return tcf_idr_search(tn, a, index);
ddf97ccd WC	655	}
ddf97ccd WC	656
29e6eee1 CD	657	static size_t tcf_csum_get_fill_size(const struct tc_action *act)
	658	{
	659	return nla_total_size(sizeof(struct tc_csum));
	660	}
	661
eb4d4065	662	static struct tc_action_ops act_csum_ops = {
0eec32ff	663	.kind = "csum",
0eec32ff	664	.type = TCA_ACT_CSUM,
0eec32ff	665	.owner = THIS_MODULE,
c831549c	666	.act = tcf_csum_act,
0eec32ff	667	.dump = tcf_csum_dump,
0eec32ff	668	.init = tcf_csum_init,
9c5f69bb	669	.cleanup = tcf_csum_cleanup,
ddf97ccd WC	670	.walk = tcf_csum_walker,
ddf97ccd WC	671	.lookup = tcf_csum_search,
29e6eee1	672	.get_fill_size = tcf_csum_get_fill_size,
a85a970a	673	.size = sizeof(struct tcf_csum),
ddf97ccd WC	674	};
	675
	676	static __net_init int csum_init_net(struct net *net)
	677	{
	678	struct tc_action_net *tn = net_generic(net, csum_net_id);
	679
c7e460ce	680	return tc_action_net_init(tn, &act_csum_ops);
ddf97ccd WC	681	}
ddf97ccd WC	682
039af9c6	683	static void __net_exit csum_exit_net(struct list_head *net_list)
ddf97ccd	684	{
039af9c6	685	tc_action_net_exit(net_list, csum_net_id);
ddf97ccd WC	686	}
	687
	688	static struct pernet_operations csum_net_ops = {
	689	.init = csum_init_net,
039af9c6	690	.exit_batch = csum_exit_net,
ddf97ccd WC	691	.id = &csum_net_id,
ddf97ccd WC	692	.size = sizeof(struct tc_action_net),
eb4d4065 GB	693	};
	694
	695	MODULE_DESCRIPTION("Checksum updating actions");
	696	MODULE_LICENSE("GPL");
	697
	698	static int __init csum_init_module(void)
	699	{
ddf97ccd	700	return tcf_register_action(&act_csum_ops, &csum_net_ops);
eb4d4065 GB	701	}
	702
	703	static void __exit csum_cleanup_module(void)
	704	{
ddf97ccd	705	tcf_unregister_action(&act_csum_ops, &csum_net_ops);
eb4d4065 GB	706	}
	707
	708	module_init(csum_init_module);
	709	module_exit(csum_cleanup_module);