![Benjamin LaHaise](/assets/img/avatar_default.png)
Eric Dumazet pointed out that act_mirred needs to find the current net_ns, and struct net pointer is not provided in the call chain. His original patch made use of current->nsproxy->net_ns to find the network namespace, but this fails to work correctly for userspace code that makes use of netlink sockets in different network namespaces. Instead, pass the "struct net *" down along the call chain to where it is needed. This version removes the ifb changes as Eric has submitted that patch separately, but is otherwise identical to the previous version. Signed-off-by: Benjamin LaHaise <bcrl@kvack.org> Tested-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
597 lines
13 KiB
C
597 lines
13 KiB
C
/*
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* Checksum updating actions
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*
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* Copyright (c) 2010 Gregoire Baron <baronchon@n7mm.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/netlink.h>
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#include <net/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/skbuff.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/icmp.h>
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#include <linux/icmpv6.h>
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#include <linux/igmp.h>
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#include <net/tcp.h>
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#include <net/udp.h>
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#include <net/ip6_checksum.h>
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#include <net/act_api.h>
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#include <linux/tc_act/tc_csum.h>
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#include <net/tc_act/tc_csum.h>
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#define CSUM_TAB_MASK 15
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static struct tcf_common *tcf_csum_ht[CSUM_TAB_MASK + 1];
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static u32 csum_idx_gen;
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static DEFINE_RWLOCK(csum_lock);
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static struct tcf_hashinfo csum_hash_info = {
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.htab = tcf_csum_ht,
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.hmask = CSUM_TAB_MASK,
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.lock = &csum_lock,
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};
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static const struct nla_policy csum_policy[TCA_CSUM_MAX + 1] = {
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[TCA_CSUM_PARMS] = { .len = sizeof(struct tc_csum), },
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};
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static int tcf_csum_init(struct net *n, struct nlattr *nla, struct nlattr *est,
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struct tc_action *a, int ovr, int bind)
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{
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struct nlattr *tb[TCA_CSUM_MAX + 1];
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struct tc_csum *parm;
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struct tcf_common *pc;
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struct tcf_csum *p;
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int ret = 0, err;
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if (nla == NULL)
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return -EINVAL;
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err = nla_parse_nested(tb, TCA_CSUM_MAX, nla, csum_policy);
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if (err < 0)
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return err;
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if (tb[TCA_CSUM_PARMS] == NULL)
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return -EINVAL;
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parm = nla_data(tb[TCA_CSUM_PARMS]);
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pc = tcf_hash_check(parm->index, a, bind, &csum_hash_info);
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if (!pc) {
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pc = tcf_hash_create(parm->index, est, a, sizeof(*p), bind,
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&csum_idx_gen, &csum_hash_info);
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if (IS_ERR(pc))
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return PTR_ERR(pc);
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p = to_tcf_csum(pc);
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ret = ACT_P_CREATED;
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} else {
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p = to_tcf_csum(pc);
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if (!ovr) {
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tcf_hash_release(pc, bind, &csum_hash_info);
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return -EEXIST;
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}
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}
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spin_lock_bh(&p->tcf_lock);
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p->tcf_action = parm->action;
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p->update_flags = parm->update_flags;
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spin_unlock_bh(&p->tcf_lock);
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if (ret == ACT_P_CREATED)
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tcf_hash_insert(pc, &csum_hash_info);
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return ret;
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}
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static int tcf_csum_cleanup(struct tc_action *a, int bind)
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{
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struct tcf_csum *p = a->priv;
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return tcf_hash_release(&p->common, bind, &csum_hash_info);
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}
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/**
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* tcf_csum_skb_nextlayer - Get next layer pointer
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* @skb: sk_buff to use
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* @ihl: previous summed headers length
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* @ipl: complete packet length
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* @jhl: next header length
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*
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* Check the expected next layer availability in the specified sk_buff.
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* Return the next layer pointer if pass, NULL otherwise.
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*/
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static void *tcf_csum_skb_nextlayer(struct sk_buff *skb,
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unsigned int ihl, unsigned int ipl,
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unsigned int jhl)
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{
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int ntkoff = skb_network_offset(skb);
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int hl = ihl + jhl;
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if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) ||
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(skb_cloned(skb) &&
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!skb_clone_writable(skb, hl + ntkoff) &&
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pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
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return NULL;
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else
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return (void *)(skb_network_header(skb) + ihl);
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}
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static int tcf_csum_ipv4_icmp(struct sk_buff *skb,
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unsigned int ihl, unsigned int ipl)
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{
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struct icmphdr *icmph;
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icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph));
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if (icmph == NULL)
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return 0;
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icmph->checksum = 0;
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skb->csum = csum_partial(icmph, ipl - ihl, 0);
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icmph->checksum = csum_fold(skb->csum);
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skb->ip_summed = CHECKSUM_NONE;
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return 1;
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}
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static int tcf_csum_ipv4_igmp(struct sk_buff *skb,
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unsigned int ihl, unsigned int ipl)
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{
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struct igmphdr *igmph;
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igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph));
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if (igmph == NULL)
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return 0;
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igmph->csum = 0;
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skb->csum = csum_partial(igmph, ipl - ihl, 0);
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igmph->csum = csum_fold(skb->csum);
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skb->ip_summed = CHECKSUM_NONE;
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return 1;
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}
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static int tcf_csum_ipv6_icmp(struct sk_buff *skb, struct ipv6hdr *ip6h,
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unsigned int ihl, unsigned int ipl)
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{
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struct icmp6hdr *icmp6h;
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icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h));
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if (icmp6h == NULL)
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return 0;
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icmp6h->icmp6_cksum = 0;
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skb->csum = csum_partial(icmp6h, ipl - ihl, 0);
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icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
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ipl - ihl, IPPROTO_ICMPV6,
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skb->csum);
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skb->ip_summed = CHECKSUM_NONE;
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return 1;
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}
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static int tcf_csum_ipv4_tcp(struct sk_buff *skb, struct iphdr *iph,
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unsigned int ihl, unsigned int ipl)
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{
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struct tcphdr *tcph;
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tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
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if (tcph == NULL)
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return 0;
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tcph->check = 0;
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skb->csum = csum_partial(tcph, ipl - ihl, 0);
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tcph->check = tcp_v4_check(ipl - ihl,
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iph->saddr, iph->daddr, skb->csum);
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skb->ip_summed = CHECKSUM_NONE;
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return 1;
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}
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static int tcf_csum_ipv6_tcp(struct sk_buff *skb, struct ipv6hdr *ip6h,
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unsigned int ihl, unsigned int ipl)
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{
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struct tcphdr *tcph;
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tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
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if (tcph == NULL)
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return 0;
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tcph->check = 0;
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skb->csum = csum_partial(tcph, ipl - ihl, 0);
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tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
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ipl - ihl, IPPROTO_TCP,
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skb->csum);
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skb->ip_summed = CHECKSUM_NONE;
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return 1;
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}
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static int tcf_csum_ipv4_udp(struct sk_buff *skb, struct iphdr *iph,
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unsigned int ihl, unsigned int ipl, int udplite)
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{
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struct udphdr *udph;
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u16 ul;
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/*
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* Support both UDP and UDPLITE checksum algorithms, Don't use
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* udph->len to get the real length without any protocol check,
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* UDPLITE uses udph->len for another thing,
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* Use iph->tot_len, or just ipl.
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*/
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udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
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if (udph == NULL)
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return 0;
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ul = ntohs(udph->len);
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if (udplite || udph->check) {
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udph->check = 0;
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if (udplite) {
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if (ul == 0)
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skb->csum = csum_partial(udph, ipl - ihl, 0);
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else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
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skb->csum = csum_partial(udph, ul, 0);
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else
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goto ignore_obscure_skb;
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} else {
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if (ul != ipl - ihl)
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goto ignore_obscure_skb;
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skb->csum = csum_partial(udph, ul, 0);
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}
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udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
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ul, iph->protocol,
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skb->csum);
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if (!udph->check)
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udph->check = CSUM_MANGLED_0;
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}
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skb->ip_summed = CHECKSUM_NONE;
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ignore_obscure_skb:
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return 1;
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}
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static int tcf_csum_ipv6_udp(struct sk_buff *skb, struct ipv6hdr *ip6h,
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unsigned int ihl, unsigned int ipl, int udplite)
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{
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struct udphdr *udph;
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u16 ul;
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/*
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* Support both UDP and UDPLITE checksum algorithms, Don't use
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* udph->len to get the real length without any protocol check,
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* UDPLITE uses udph->len for another thing,
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* Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl.
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*/
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udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
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if (udph == NULL)
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return 0;
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ul = ntohs(udph->len);
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udph->check = 0;
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if (udplite) {
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if (ul == 0)
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skb->csum = csum_partial(udph, ipl - ihl, 0);
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else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
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skb->csum = csum_partial(udph, ul, 0);
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else
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goto ignore_obscure_skb;
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} else {
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if (ul != ipl - ihl)
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goto ignore_obscure_skb;
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skb->csum = csum_partial(udph, ul, 0);
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}
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udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul,
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udplite ? IPPROTO_UDPLITE : IPPROTO_UDP,
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skb->csum);
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if (!udph->check)
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udph->check = CSUM_MANGLED_0;
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skb->ip_summed = CHECKSUM_NONE;
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ignore_obscure_skb:
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return 1;
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}
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static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags)
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{
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struct iphdr *iph;
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int ntkoff;
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ntkoff = skb_network_offset(skb);
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if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff))
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goto fail;
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iph = ip_hdr(skb);
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switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) {
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case IPPROTO_ICMP:
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if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
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if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4,
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ntohs(iph->tot_len)))
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goto fail;
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break;
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case IPPROTO_IGMP:
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if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP)
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if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4,
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ntohs(iph->tot_len)))
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goto fail;
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break;
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case IPPROTO_TCP:
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if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
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if (!tcf_csum_ipv4_tcp(skb, iph, iph->ihl * 4,
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ntohs(iph->tot_len)))
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goto fail;
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break;
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case IPPROTO_UDP:
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if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
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if (!tcf_csum_ipv4_udp(skb, iph, iph->ihl * 4,
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ntohs(iph->tot_len), 0))
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goto fail;
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break;
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case IPPROTO_UDPLITE:
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if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
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if (!tcf_csum_ipv4_udp(skb, iph, iph->ihl * 4,
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ntohs(iph->tot_len), 1))
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goto fail;
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break;
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}
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if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) {
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if (skb_cloned(skb) &&
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!skb_clone_writable(skb, sizeof(*iph) + ntkoff) &&
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pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
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goto fail;
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ip_send_check(iph);
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}
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return 1;
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fail:
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return 0;
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}
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static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh,
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unsigned int ixhl, unsigned int *pl)
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{
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int off, len, optlen;
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unsigned char *xh = (void *)ip6xh;
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off = sizeof(*ip6xh);
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len = ixhl - off;
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while (len > 1) {
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switch (xh[off]) {
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case IPV6_TLV_PAD1:
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optlen = 1;
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break;
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case IPV6_TLV_JUMBO:
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optlen = xh[off + 1] + 2;
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if (optlen != 6 || len < 6 || (off & 3) != 2)
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/* wrong jumbo option length/alignment */
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return 0;
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*pl = ntohl(*(__be32 *)(xh + off + 2));
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goto done;
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default:
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optlen = xh[off + 1] + 2;
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if (optlen > len)
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/* ignore obscure options */
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goto done;
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break;
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}
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off += optlen;
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len -= optlen;
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}
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done:
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return 1;
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}
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static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags)
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{
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struct ipv6hdr *ip6h;
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struct ipv6_opt_hdr *ip6xh;
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unsigned int hl, ixhl;
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unsigned int pl;
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int ntkoff;
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u8 nexthdr;
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ntkoff = skb_network_offset(skb);
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hl = sizeof(*ip6h);
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if (!pskb_may_pull(skb, hl + ntkoff))
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goto fail;
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ip6h = ipv6_hdr(skb);
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pl = ntohs(ip6h->payload_len);
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nexthdr = ip6h->nexthdr;
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do {
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switch (nexthdr) {
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case NEXTHDR_FRAGMENT:
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goto ignore_skb;
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case NEXTHDR_ROUTING:
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case NEXTHDR_HOP:
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case NEXTHDR_DEST:
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if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff))
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goto fail;
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ip6xh = (void *)(skb_network_header(skb) + hl);
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ixhl = ipv6_optlen(ip6xh);
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if (!pskb_may_pull(skb, hl + ixhl + ntkoff))
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goto fail;
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if ((nexthdr == NEXTHDR_HOP) &&
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!(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl)))
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goto fail;
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nexthdr = ip6xh->nexthdr;
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hl += ixhl;
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break;
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case IPPROTO_ICMPV6:
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if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
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if (!tcf_csum_ipv6_icmp(skb, ip6h,
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hl, pl + sizeof(*ip6h)))
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goto fail;
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goto done;
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case IPPROTO_TCP:
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if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
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if (!tcf_csum_ipv6_tcp(skb, ip6h,
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hl, pl + sizeof(*ip6h)))
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goto fail;
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goto done;
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case IPPROTO_UDP:
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if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
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if (!tcf_csum_ipv6_udp(skb, ip6h, hl,
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pl + sizeof(*ip6h), 0))
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goto fail;
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goto done;
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case IPPROTO_UDPLITE:
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if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
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if (!tcf_csum_ipv6_udp(skb, ip6h, hl,
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pl + sizeof(*ip6h), 1))
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goto fail;
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goto done;
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default:
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goto ignore_skb;
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}
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} while (pskb_may_pull(skb, hl + 1 + ntkoff));
|
|
|
|
done:
|
|
ignore_skb:
|
|
return 1;
|
|
|
|
fail:
|
|
return 0;
|
|
}
|
|
|
|
static int tcf_csum(struct sk_buff *skb,
|
|
const struct tc_action *a, struct tcf_result *res)
|
|
{
|
|
struct tcf_csum *p = a->priv;
|
|
int action;
|
|
u32 update_flags;
|
|
|
|
spin_lock(&p->tcf_lock);
|
|
p->tcf_tm.lastuse = jiffies;
|
|
bstats_update(&p->tcf_bstats, skb);
|
|
action = p->tcf_action;
|
|
update_flags = p->update_flags;
|
|
spin_unlock(&p->tcf_lock);
|
|
|
|
if (unlikely(action == TC_ACT_SHOT))
|
|
goto drop;
|
|
|
|
switch (skb->protocol) {
|
|
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:
|
|
spin_lock(&p->tcf_lock);
|
|
p->tcf_qstats.drops++;
|
|
spin_unlock(&p->tcf_lock);
|
|
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 = a->priv;
|
|
struct tc_csum opt = {
|
|
.update_flags = p->update_flags,
|
|
.index = p->tcf_index,
|
|
.action = p->tcf_action,
|
|
.refcnt = p->tcf_refcnt - ref,
|
|
.bindcnt = p->tcf_bindcnt - bind,
|
|
};
|
|
struct tcf_t t;
|
|
|
|
if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt))
|
|
goto nla_put_failure;
|
|
t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install);
|
|
t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse);
|
|
t.expires = jiffies_to_clock_t(p->tcf_tm.expires);
|
|
if (nla_put(skb, TCA_CSUM_TM, sizeof(t), &t))
|
|
goto nla_put_failure;
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static struct tc_action_ops act_csum_ops = {
|
|
.kind = "csum",
|
|
.hinfo = &csum_hash_info,
|
|
.type = TCA_ACT_CSUM,
|
|
.capab = TCA_CAP_NONE,
|
|
.owner = THIS_MODULE,
|
|
.act = tcf_csum,
|
|
.dump = tcf_csum_dump,
|
|
.cleanup = tcf_csum_cleanup,
|
|
.lookup = tcf_hash_search,
|
|
.init = tcf_csum_init,
|
|
.walk = tcf_generic_walker
|
|
};
|
|
|
|
MODULE_DESCRIPTION("Checksum updating actions");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int __init csum_init_module(void)
|
|
{
|
|
return tcf_register_action(&act_csum_ops);
|
|
}
|
|
|
|
static void __exit csum_cleanup_module(void)
|
|
{
|
|
tcf_unregister_action(&act_csum_ops);
|
|
}
|
|
|
|
module_init(csum_init_module);
|
|
module_exit(csum_cleanup_module);
|