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[IPV4]: Add 'rtable' field in struct sk_buff to alias 'dst' and avoid casts

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(Anonymous) unions can help us to avoid ugly casts.

A common cast it the (struct rtable *)skb->dst one.

Defining an union like  :
union {
     struct dst_entry *dst;
     struct rtable *rtable;
};
permits to use skb->rtable in place.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2008-03-05 18:30:47 -08:00 committed by David S. Miller
parent a05c44f6d5
commit ee6b967301
23 changed files with 69 additions and 68 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
include/linux/skbuff.h
View file

@ -256,7 +256,10 @@ struct sk_buff {
ktime_t tstamp;
struct net_device *dev;
struct dst_entry *dst;
union {
struct dst_entry *dst;
struct rtable *rtable;
};
struct sec_path *sp;
/*

2
include/net/inet_sock.h
View file

@ -195,7 +195,7 @@ static inline int inet_sk_ehashfn(const struct sock *sk)
static inline int inet_iif(const struct sk_buff *skb)
{
return ((struct rtable *)skb->dst)->rt_iif;
return skb->rtable->rt_iif;
}
#endif /* _INET_SOCK_H */

14
net/bridge/br_netfilter.c
View file

@ -223,8 +223,8 @@ static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb)
}
nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
skb->dst = (struct dst_entry *)&__fake_rtable;
dst_hold(skb->dst);
skb->rtable = &__fake_rtable;
dst_hold(&__fake_rtable.u.dst);
skb->dev = nf_bridge->physindev;
nf_bridge_push_encap_header(skb);
@ -388,8 +388,8 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb)
skb->pkt_type = PACKET_HOST;
}
} else {
skb->dst = (struct dst_entry *)&__fake_rtable;
dst_hold(skb->dst);
skb->rtable = &__fake_rtable;
dst_hold(&__fake_rtable.u.dst);
}
skb->dev = nf_bridge->physindev;
@ -608,9 +608,9 @@ static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
if (skb->dst == (struct dst_entry *)&__fake_rtable) {
dst_release(skb->dst);
skb->dst = NULL;
if (skb->rtable == &__fake_rtable) {
dst_release(&__fake_rtable.u.dst);
skb->rtable = NULL;
}
return NF_ACCEPT;

7
net/dccp/ipv4.c
View file

@ -450,7 +450,7 @@ static struct dst_entry* dccp_v4_route_skb(struct sock *sk,
struct sk_buff *skb)
{
struct rtable *rt;
struct flowi fl = { .oif = ((struct rtable *)skb->dst)->rt_iif,
struct flowi fl = { .oif = skb->rtable->rt_iif,
.nl_u = { .ip4_u =
{ .daddr = ip_hdr(skb)->saddr,
.saddr = ip_hdr(skb)->daddr,
@ -511,7 +511,7 @@ static void dccp_v4_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
return;
if (((struct rtable *)rxskb->dst)->rt_type != RTN_LOCAL)
if (rxskb->rtable->rt_type != RTN_LOCAL)
return;
dst = dccp_v4_route_skb(dccp_v4_ctl_socket->sk, rxskb);
@ -563,8 +563,7 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
/* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */
if (((struct rtable *)skb->dst)->rt_flags &
(RTCF_BROADCAST | RTCF_MULTICAST))
if (skb->rtable->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))
return 0; /* discard, don't send a reset here */
if (dccp_bad_service_code(sk, service)) {

4
net/ipv4/arp.c
View file

@ -475,7 +475,7 @@ int arp_find(unsigned char *haddr, struct sk_buff *skb)
return 1;
}
paddr = ((struct rtable*)skb->dst)->rt_gateway;
paddr = skb->rtable->rt_gateway;
if (arp_set_predefined(inet_addr_type(&init_net, paddr), haddr, paddr, dev))
return 0;
@ -814,7 +814,7 @@ static int arp_process(struct sk_buff *skb)
if (arp->ar_op == htons(ARPOP_REQUEST) &&
ip_route_input(skb, tip, sip, 0, dev) == 0) {
rt = (struct rtable*)skb->dst;
rt = skb->rtable;
addr_type = rt->rt_type;
if (addr_type == RTN_LOCAL) {

10
net/ipv4/icmp.c
View file

@ -381,7 +381,7 @@ static void icmp_push_reply(struct icmp_bxm *icmp_param,
static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
{
struct ipcm_cookie ipc;
struct rtable *rt = (struct rtable *)skb->dst;
struct rtable *rt = skb->rtable;
struct net *net = rt->u.dst.dev->nd_net;
struct sock *sk = icmp_sk(net);
struct inet_sock *inet = inet_sk(sk);
@ -438,7 +438,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
struct iphdr *iph;
int room;
struct icmp_bxm icmp_param;
struct rtable *rt = (struct rtable *)skb_in->dst;
struct rtable *rt = skb_in->rtable;
struct ipcm_cookie ipc;
__be32 saddr;
u8 tos;
@ -616,7 +616,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
RT_TOS(tos), rt2->u.dst.dev);
dst_release(&rt2->u.dst);
rt2 = (struct rtable *)skb_in->dst;
rt2 = skb_in->rtable;
skb_in->dst = odst;
}
@ -943,7 +943,7 @@ static void icmp_address(struct sk_buff *skb)
static void icmp_address_reply(struct sk_buff *skb)
{
struct rtable *rt = (struct rtable *)skb->dst;
struct rtable *rt = skb->rtable;
struct net_device *dev = skb->dev;
struct in_device *in_dev;
struct in_ifaddr *ifa;
@ -988,7 +988,7 @@ static void icmp_discard(struct sk_buff *skb)
int icmp_rcv(struct sk_buff *skb)
{
struct icmphdr *icmph;
struct rtable *rt = (struct rtable *)skb->dst;
struct rtable *rt = skb->rtable;
if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {
int nh;

2
net/ipv4/igmp.c
View file

@ -948,7 +948,7 @@ int igmp_rcv(struct sk_buff *skb)
case IGMPV2_HOST_MEMBERSHIP_REPORT:
case IGMPV3_HOST_MEMBERSHIP_REPORT:
/* Is it our report looped back? */
if (((struct rtable*)skb->dst)->fl.iif == 0)
if (skb->rtable->fl.iif == 0)
break;
/* don't rely on MC router hearing unicast reports */
if (skb->pkt_type == PACKET_MULTICAST ||

2
net/ipv4/ip_forward.c
View file

@ -80,7 +80,7 @@ int ip_forward(struct sk_buff *skb)
if (!xfrm4_route_forward(skb))
goto drop;
rt = (struct rtable*)skb->dst;
rt = skb->rtable;
if (opt->is_strictroute && rt->rt_dst != rt->rt_gateway)
goto sr_failed;

4
net/ipv4/ip_gre.c
View file

@ -619,7 +619,7 @@ static int ipgre_rcv(struct sk_buff *skb)
#ifdef CONFIG_NET_IPGRE_BROADCAST
if (ipv4_is_multicast(iph->daddr)) {
/* Looped back packet, drop it! */
if (((struct rtable*)skb->dst)->fl.iif == 0)
if (skb->rtable->fl.iif == 0)
goto drop;
tunnel->stat.multicast++;
skb->pkt_type = PACKET_BROADCAST;
@ -699,7 +699,7 @@ static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
}
if (skb->protocol == htons(ETH_P_IP)) {
rt = (struct rtable*)skb->dst;
rt = skb->rtable;
if ((dst = rt->rt_gateway) == 0)
goto tx_error_icmp;
}

2
net/ipv4/ip_input.c
View file

@ -351,7 +351,7 @@ static int ip_rcv_finish(struct sk_buff *skb)
if (iph->ihl > 5 && ip_rcv_options(skb))
goto drop;
rt = (struct rtable*)skb->dst;
rt = skb->rtable;
if (rt->rt_type == RTN_MULTICAST)
IP_INC_STATS_BH(IPSTATS_MIB_INMCASTPKTS);
else if (rt->rt_type == RTN_BROADCAST)

16
net/ipv4/ip_options.c
View file

@ -107,7 +107,7 @@ int ip_options_echo(struct ip_options * dopt, struct sk_buff * skb)
sptr = skb_network_header(skb);
dptr = dopt->__data;
daddr = ((struct rtable*)skb->dst)->rt_spec_dst;
daddr = skb->rtable->rt_spec_dst;
if (sopt->rr) {
optlen = sptr[sopt->rr+1];
@ -258,7 +258,7 @@ int ip_options_compile(struct ip_options * opt, struct sk_buff * skb)
unsigned char * optptr;
int optlen;
unsigned char * pp_ptr = NULL;
struct rtable *rt = skb ? (struct rtable*)skb->dst : NULL;
struct rtable *rt = skb ? skb->rtable : NULL;
if (!opt) {
opt = &(IPCB(skb)->opt);
@ -558,7 +558,7 @@ void ip_forward_options(struct sk_buff *skb)
{
struct ip_options * opt = &(IPCB(skb)->opt);
unsigned char * optptr;
struct rtable *rt = (struct rtable*)skb->dst;
struct rtable *rt = skb->rtable;
unsigned char *raw = skb_network_header(skb);
if (opt->rr_needaddr) {
@ -606,7 +606,7 @@ int ip_options_rcv_srr(struct sk_buff *skb)
__be32 nexthop;
struct iphdr *iph = ip_hdr(skb);
unsigned char *optptr = skb_network_header(skb) + opt->srr;
struct rtable *rt = (struct rtable*)skb->dst;
struct rtable *rt = skb->rtable;
struct rtable *rt2;
int err;
@ -631,13 +631,13 @@ int ip_options_rcv_srr(struct sk_buff *skb)
}
memcpy(&nexthop, &optptr[srrptr-1], 4);
rt = (struct rtable*)skb->dst;
skb->dst = NULL;
rt = skb->rtable;
skb->rtable = NULL;
err = ip_route_input(skb, nexthop, iph->saddr, iph->tos, skb->dev);
rt2 = (struct rtable*)skb->dst;
rt2 = skb->rtable;
if (err || (rt2->rt_type != RTN_UNICAST && rt2->rt_type != RTN_LOCAL)) {
ip_rt_put(rt2);
skb->dst = &rt->u.dst;
skb->rtable = rt;
return -EINVAL;
}
ip_rt_put(rt);

10
net/ipv4/ip_output.c
View file

@ -142,7 +142,7 @@ int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
__be32 saddr, __be32 daddr, struct ip_options *opt)
{
struct inet_sock *inet = inet_sk(sk);
struct rtable *rt = (struct rtable *)skb->dst;
struct rtable *rt = skb->rtable;
struct iphdr *iph;
/* Build the IP header. */
@ -240,7 +240,7 @@ static int ip_finish_output(struct sk_buff *skb)
int ip_mc_output(struct sk_buff *skb)
{
struct sock *sk = skb->sk;
struct rtable *rt = (struct rtable*)skb->dst;
struct rtable *rt = skb->rtable;
struct net_device *dev = rt->u.dst.dev;
/*
@ -321,7 +321,7 @@ int ip_queue_xmit(struct sk_buff *skb, int ipfragok)
/* Skip all of this if the packet is already routed,
* f.e. by something like SCTP.
*/
rt = (struct rtable *) skb->dst;
rt = skb->rtable;
if (rt != NULL)
goto packet_routed;
@ -441,7 +441,7 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
unsigned int mtu, hlen, left, len, ll_rs, pad;
int offset;
__be16 not_last_frag;
struct rtable *rt = (struct rtable*)skb->dst;
struct rtable *rt = skb->rtable;
int err = 0;
dev = rt->u.dst.dev;
@ -1357,7 +1357,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
} replyopts;
struct ipcm_cookie ipc;
__be32 daddr;
struct rtable *rt = (struct rtable*)skb->dst;
struct rtable *rt = skb->rtable;
if (ip_options_echo(&replyopts.opt, skb))
return;

2
net/ipv4/ip_sockglue.c
View file

@ -57,7 +57,7 @@
static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
{
struct in_pktinfo info;
struct rtable *rt = (struct rtable *)skb->dst;
struct rtable *rt = skb->rtable;
info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
if (rt) {

2
net/ipv4/ipip.c
View file

@ -528,7 +528,7 @@ static int ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
if (!dst) {
/* NBMA tunnel */
if ((rt = (struct rtable*)skb->dst) == NULL) {
if ((rt = skb->rtable) == NULL) {
tunnel->stat.tx_fifo_errors++;
goto tx_error;
}

6
net/ipv4/ipmr.c
View file

@ -1283,7 +1283,7 @@ static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local
if (vif_table[vif].dev != skb->dev) {
int true_vifi;
if (((struct rtable*)skb->dst)->fl.iif == 0) {
if (skb->rtable->fl.iif == 0) {
/* It is our own packet, looped back.
Very complicated situation...
@ -1357,7 +1357,7 @@ static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local
int ip_mr_input(struct sk_buff *skb)
{
struct mfc_cache *cache;
int local = ((struct rtable*)skb->dst)->rt_flags&RTCF_LOCAL;
int local = skb->rtable->rt_flags&RTCF_LOCAL;
/* Packet is looped back after forward, it should not be
forwarded second time, but still can be delivered locally.
@ -1594,7 +1594,7 @@ int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait)
{
int err;
struct mfc_cache *cache;
struct rtable *rt = (struct rtable*)skb->dst;
struct rtable *rt = skb->rtable;
read_lock(&mrt_lock);
cache = ipmr_cache_find(rt->rt_src, rt->rt_dst);

2
net/ipv4/netfilter/ipt_MASQUERADE.c
View file

@ -77,7 +77,7 @@ masquerade_tg(struct sk_buff *skb, const struct net_device *in,
return NF_ACCEPT;
mr = targinfo;
rt = (struct rtable *)skb->dst;
rt = skb->rtable;
newsrc = inet_select_addr(out, rt->rt_gateway, RT_SCOPE_UNIVERSE);
if (!newsrc) {
printk("MASQUERADE: %s ate my IP address\n", out->name);

4
net/ipv4/netfilter/nf_nat_helper.c
View file

@ -139,7 +139,7 @@ nf_nat_mangle_tcp_packet(struct sk_buff *skb,
const char *rep_buffer,
unsigned int rep_len)
{
struct rtable *rt = (struct rtable *)skb->dst;
struct rtable *rt = skb->rtable;
struct iphdr *iph;
struct tcphdr *tcph;
int oldlen, datalen;
@ -217,7 +217,7 @@ nf_nat_mangle_udp_packet(struct sk_buff *skb,
const char *rep_buffer,
unsigned int rep_len)
{
struct rtable *rt = (struct rtable *)skb->dst;
struct rtable *rt = skb->rtable;
struct iphdr *iph;
struct udphdr *udph;
int datalen, oldlen;

22
net/ipv4/route.c
View file

@ -1289,7 +1289,7 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst)
{
struct rtable *rt = (struct rtable*)dst;
struct rtable *rt = (struct rtable *)dst;
struct dst_entry *ret = dst;
if (rt) {
@ -1330,7 +1330,7 @@ static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst)
void ip_rt_send_redirect(struct sk_buff *skb)
{
struct rtable *rt = (struct rtable*)skb->dst;
struct rtable *rt = skb->rtable;
struct in_device *in_dev = in_dev_get(rt->u.dst.dev);
if (!in_dev)
@ -1379,7 +1379,7 @@ void ip_rt_send_redirect(struct sk_buff *skb)
static int ip_error(struct sk_buff *skb)
{
struct rtable *rt = (struct rtable*)skb->dst;
struct rtable *rt = skb->rtable;
unsigned long now;
int code;
@ -1548,7 +1548,7 @@ static void ipv4_link_failure(struct sk_buff *skb)
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
rt = (struct rtable *) skb->dst;
rt = skb->rtable;
if (rt)
dst_set_expires(&rt->u.dst, 0);
}
@ -1708,7 +1708,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
in_dev_put(in_dev);
hash = rt_hash(daddr, saddr, dev->ifindex);
return rt_intern_hash(hash, rth, (struct rtable**) &skb->dst);
return rt_intern_hash(hash, rth, &skb->rtable);
e_nobufs:
in_dev_put(in_dev);
@ -1869,7 +1869,7 @@ static inline int ip_mkroute_input(struct sk_buff *skb,
/* put it into the cache */
hash = rt_hash(daddr, saddr, fl->iif);
return rt_intern_hash(hash, rth, (struct rtable**)&skb->dst);
return rt_intern_hash(hash, rth, &skb->rtable);
}
/*
@ -2025,7 +2025,7 @@ out: return err;
}
rth->rt_type = res.type;
hash = rt_hash(daddr, saddr, fl.iif);
err = rt_intern_hash(hash, rth, (struct rtable**)&skb->dst);
err = rt_intern_hash(hash, rth, &skb->rtable);
goto done;
no_route:
@ -2091,7 +2091,7 @@ int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
dst_use(&rth->u.dst, jiffies);
RT_CACHE_STAT_INC(in_hit);
rcu_read_unlock();
skb->dst = (struct dst_entry*)rth;
skb->rtable = rth;
return 0;
}
RT_CACHE_STAT_INC(in_hlist_search);
@ -2598,7 +2598,7 @@ int ip_route_output_key(struct net *net, struct rtable **rp, struct flowi *flp)
static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
int nowait, unsigned int flags)
{
struct rtable *rt = (struct rtable*)skb->dst;
struct rtable *rt = skb->rtable;
struct rtmsg *r;
struct nlmsghdr *nlh;
long expires;
@ -2742,7 +2742,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void
err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev);
local_bh_enable();
rt = (struct rtable*) skb->dst;
rt = skb->rtable;
if (err == 0 && rt->u.dst.error)
err = -rt->u.dst.error;
} else {
@ -2762,7 +2762,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void
if (err)
goto errout_free;
skb->dst = &rt->u.dst;
skb->rtable = rt;
if (rtm->rtm_flags & RTM_F_NOTIFY)
rt->rt_flags |= RTCF_NOTIFY;

5
net/ipv4/tcp_ipv4.c
View file

@ -552,7 +552,7 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
if (th->rst)
return;
if (((struct rtable *)skb->dst)->rt_type != RTN_LOCAL)
if (skb->rtable->rt_type != RTN_LOCAL)
return;
/* Swap the send and the receive. */
@ -1262,8 +1262,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
#endif
/* Never answer to SYNs send to broadcast or multicast */
if (((struct rtable *)skb->dst)->rt_flags &
(RTCF_BROADCAST | RTCF_MULTICAST))
if (skb->rtable->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))
goto drop;
/* TW buckets are converted to open requests without

2
net/ipv4/udp_ipv4.c
View file

@ -893,7 +893,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
struct sock *sk;
struct udphdr *uh = udp_hdr(skb);
unsigned short ulen;
struct rtable *rt = (struct rtable*)skb->dst;
struct rtable *rt = skb->rtable;
__be32 saddr = ip_hdr(skb)->saddr;
__be32 daddr = ip_hdr(skb)->daddr;

2
net/netfilter/nf_conntrack_netbios_ns.c
View file

@ -47,7 +47,7 @@ static int help(struct sk_buff *skb, unsigned int protoff,
{
struct nf_conntrack_expect *exp;
struct iphdr *iph = ip_hdr(skb);
struct rtable *rt = (struct rtable *)skb->dst;
struct rtable *rt = skb->rtable;
struct in_device *in_dev;
__be32 mask = 0;

4
net/sched/em_meta.c
View file

@ -256,10 +256,10 @@ META_COLLECTOR(int_rtclassid)
META_COLLECTOR(int_rtiif)
{
if (unlikely(skb->dst == NULL))
if (unlikely(skb->rtable == NULL))
*err = -1;
else
dst->value = ((struct rtable*) skb->dst)->fl.iif;
dst->value = skb->rtable->fl.iif;
}
/**************************************************************************

8
net/sctp/protocol.c
View file

@ -363,7 +363,7 @@ static int sctp_v4_addr_valid(union sctp_addr *addr,
return 0;
/* Is this a broadcast address? */
if (skb && ((struct rtable *)skb->dst)->rt_flags & RTCF_BROADCAST)
if (skb && skb->rtable->rt_flags & RTCF_BROADCAST)
return 0;
return 1;
@ -539,7 +539,7 @@ static void sctp_v4_get_saddr(struct sctp_association *asoc,
/* What interface did this skb arrive on? */
static int sctp_v4_skb_iif(const struct sk_buff *skb)
{
return ((struct rtable *)skb->dst)->rt_iif;
return skb->rtable->rt_iif;
}
/* Was this packet marked by Explicit Congestion Notification? */
@ -828,8 +828,8 @@ static inline int sctp_v4_xmit(struct sk_buff *skb,
SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
"src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
__FUNCTION__, skb, skb->len,
NIPQUAD(((struct rtable *)skb->dst)->rt_src),
NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
NIPQUAD(skb->rtable->rt_src),
NIPQUAD(skb->rtable->rt_dst));
SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
return ip_queue_xmit(skb, ipfragok);