v4.19.13 snapshot.
diff --git a/net/sched/act_csum.c b/net/sched/act_csum.c
new file mode 100644
index 0000000..b8a67ae
--- /dev/null
+++ b/net/sched/act_csum.c
@@ -0,0 +1,709 @@
+/*
+ * 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);