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Message-Id: <20110508.180753.241908549.davem@davemloft.net>
Date: Sun, 08 May 2011 18:07:53 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
Subject: [PATCH 1/2] ipv4: Pass flow keys down into datagram packet
building engine.
This way ip_output.c no longer needs rt->rt_{src,dst}.
We already have these keys sitting, ready and waiting, on the stack or
in a socket structure.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
include/net/ip.h | 8 +++--
net/ipv4/icmp.c | 74 ++++++++++++++++++++++++-------------------------
net/ipv4/ip_output.c | 39 +++++++++++++-------------
net/ipv4/raw.c | 59 +++++++++++++++++++--------------------
net/ipv4/udp.c | 4 +-
5 files changed, 91 insertions(+), 93 deletions(-)
diff --git a/include/net/ip.h b/include/net/ip.h
index acf8b78..a425379 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -117,12 +117,14 @@ extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int od
extern ssize_t ip_append_page(struct sock *sk, struct page *page,
int offset, size_t size, int flags);
extern struct sk_buff *__ip_make_skb(struct sock *sk,
+ struct flowi4 *fl4,
struct sk_buff_head *queue,
struct inet_cork *cork);
extern int ip_send_skb(struct sk_buff *skb);
-extern int ip_push_pending_frames(struct sock *sk);
+extern int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
extern void ip_flush_pending_frames(struct sock *sk);
extern struct sk_buff *ip_make_skb(struct sock *sk,
+ struct flowi4 *fl4,
int getfrag(void *from, char *to, int offset, int len,
int odd, struct sk_buff *skb),
void *from, int length, int transhdrlen,
@@ -130,9 +132,9 @@ extern struct sk_buff *ip_make_skb(struct sock *sk,
struct rtable **rtp,
unsigned int flags);
-static inline struct sk_buff *ip_finish_skb(struct sock *sk)
+static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
{
- return __ip_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
+ return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
}
/* datagram.c */
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index cfeca3c..b3dc6de 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -290,6 +290,7 @@ static int icmp_glue_bits(void *from, char *to, int offset, int len, int odd,
}
static void icmp_push_reply(struct icmp_bxm *icmp_param,
+ struct flowi4 *fl4,
struct ipcm_cookie *ipc, struct rtable **rt)
{
struct sock *sk;
@@ -315,7 +316,7 @@ static void icmp_push_reply(struct icmp_bxm *icmp_param,
icmp_param->head_len, csum);
icmph->checksum = csum_fold(csum);
skb->ip_summed = CHECKSUM_NONE;
- ip_push_pending_frames(sk);
+ ip_push_pending_frames(sk, fl4);
}
}
@@ -328,6 +329,7 @@ static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
struct ipcm_cookie ipc;
struct rtable *rt = skb_rtable(skb);
struct net *net = dev_net(rt->dst.dev);
+ struct flowi4 fl4;
struct sock *sk;
struct inet_sock *inet;
__be32 daddr;
@@ -351,57 +353,52 @@ static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
if (ipc.opt->opt.srr)
daddr = icmp_param->replyopts.opt.opt.faddr;
}
- {
- struct flowi4 fl4 = {
- .daddr = daddr,
- .saddr = rt->rt_spec_dst,
- .flowi4_tos = RT_TOS(ip_hdr(skb)->tos),
- .flowi4_proto = IPPROTO_ICMP,
- };
- security_skb_classify_flow(skb, flowi4_to_flowi(&fl4));
- rt = ip_route_output_key(net, &fl4);
- if (IS_ERR(rt))
- goto out_unlock;
- }
+ memset(&fl4, 0, sizeof(fl4));
+ fl4.daddr = daddr;
+ fl4.saddr = rt->rt_spec_dst;
+ fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
+ fl4.flowi4_proto = IPPROTO_ICMP;
+ security_skb_classify_flow(skb, flowi4_to_flowi(&fl4));
+ rt = ip_route_output_key(net, &fl4);
+ if (IS_ERR(rt))
+ goto out_unlock;
if (icmpv4_xrlim_allow(net, rt, icmp_param->data.icmph.type,
icmp_param->data.icmph.code))
- icmp_push_reply(icmp_param, &ipc, &rt);
+ icmp_push_reply(icmp_param, &fl4, &ipc, &rt);
ip_rt_put(rt);
out_unlock:
icmp_xmit_unlock(sk);
}
-static struct rtable *icmp_route_lookup(struct net *net, struct sk_buff *skb_in,
+static struct rtable *icmp_route_lookup(struct net *net,
+ struct flowi4 *fl4,
+ struct sk_buff *skb_in,
const struct iphdr *iph,
__be32 saddr, u8 tos,
int type, int code,
struct icmp_bxm *param)
{
- struct flowi4 fl4 = {
- .daddr = (param->replyopts.opt.opt.srr ?
- param->replyopts.opt.opt.faddr : iph->saddr),
- .saddr = saddr,
- .flowi4_tos = RT_TOS(tos),
- .flowi4_proto = IPPROTO_ICMP,
- .fl4_icmp_type = type,
- .fl4_icmp_code = code,
- };
struct rtable *rt, *rt2;
int err;
- security_skb_classify_flow(skb_in, flowi4_to_flowi(&fl4));
- rt = __ip_route_output_key(net, &fl4);
+ memset(&fl4, 0, sizeof(fl4));
+ fl4->daddr = (param->replyopts.opt.opt.srr ?
+ param->replyopts.opt.opt.faddr : iph->saddr);
+ fl4->saddr = saddr;
+ fl4->flowi4_tos = RT_TOS(tos);
+ fl4->flowi4_proto = IPPROTO_ICMP;
+ fl4->fl4_icmp_type = type;
+ fl4->fl4_icmp_code = code;
+ security_skb_classify_flow(skb_in, flowi4_to_flowi(fl4));
+ rt = __ip_route_output_key(net, fl4);
if (IS_ERR(rt))
return rt;
/* No need to clone since we're just using its address. */
rt2 = rt;
- if (!fl4.saddr)
- fl4.saddr = rt->rt_src;
-
rt = (struct rtable *) xfrm_lookup(net, &rt->dst,
- flowi4_to_flowi(&fl4), NULL, 0);
+ flowi4_to_flowi(fl4), NULL, 0);
if (!IS_ERR(rt)) {
if (rt != rt2)
return rt;
@@ -410,19 +407,19 @@ static struct rtable *icmp_route_lookup(struct net *net, struct sk_buff *skb_in,
} else
return rt;
- err = xfrm_decode_session_reverse(skb_in, flowi4_to_flowi(&fl4), AF_INET);
+ err = xfrm_decode_session_reverse(skb_in, flowi4_to_flowi(fl4), AF_INET);
if (err)
goto relookup_failed;
- if (inet_addr_type(net, fl4.saddr) == RTN_LOCAL) {
- rt2 = __ip_route_output_key(net, &fl4);
+ if (inet_addr_type(net, fl4->saddr) == RTN_LOCAL) {
+ rt2 = __ip_route_output_key(net, fl4);
if (IS_ERR(rt2))
err = PTR_ERR(rt2);
} else {
struct flowi4 fl4_2 = {};
unsigned long orefdst;
- fl4_2.daddr = fl4.saddr;
+ fl4_2.daddr = fl4->saddr;
rt2 = ip_route_output_key(net, &fl4_2);
if (IS_ERR(rt2)) {
err = PTR_ERR(rt2);
@@ -430,7 +427,7 @@ static struct rtable *icmp_route_lookup(struct net *net, struct sk_buff *skb_in,
}
/* Ugh! */
orefdst = skb_in->_skb_refdst; /* save old refdst */
- err = ip_route_input(skb_in, fl4.daddr, fl4.saddr,
+ err = ip_route_input(skb_in, fl4->daddr, fl4->saddr,
RT_TOS(tos), rt2->dst.dev);
dst_release(&rt2->dst);
@@ -442,7 +439,7 @@ static struct rtable *icmp_route_lookup(struct net *net, struct sk_buff *skb_in,
goto relookup_failed;
rt2 = (struct rtable *) xfrm_lookup(net, &rt2->dst,
- flowi4_to_flowi(&fl4), NULL,
+ flowi4_to_flowi(fl4), NULL,
XFRM_LOOKUP_ICMP);
if (!IS_ERR(rt2)) {
dst_release(&rt->dst);
@@ -481,6 +478,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
struct icmp_bxm icmp_param;
struct rtable *rt = skb_rtable(skb_in);
struct ipcm_cookie ipc;
+ struct flowi4 fl4;
__be32 saddr;
u8 tos;
struct net *net;
@@ -599,7 +597,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
ipc.opt = &icmp_param.replyopts.opt;
ipc.tx_flags = 0;
- rt = icmp_route_lookup(net, skb_in, iph, saddr, tos,
+ rt = icmp_route_lookup(net, &fl4, skb_in, iph, saddr, tos,
type, code, &icmp_param);
if (IS_ERR(rt))
goto out_unlock;
@@ -620,7 +618,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
icmp_param.data_len = room;
icmp_param.head_len = sizeof(struct icmphdr);
- icmp_push_reply(&icmp_param, &ipc, &rt);
+ icmp_push_reply(&icmp_param, &fl4, &ipc, &rt);
ende:
ip_rt_put(rt);
out_unlock:
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index b88ee5f..dca637b 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1267,6 +1267,7 @@ static void ip_cork_release(struct inet_cork *cork)
* and push them out.
*/
struct sk_buff *__ip_make_skb(struct sock *sk,
+ struct flowi4 *fl4,
struct sk_buff_head *queue,
struct inet_cork *cork)
{
@@ -1333,8 +1334,8 @@ struct sk_buff *__ip_make_skb(struct sock *sk,
ip_select_ident(iph, &rt->dst, sk);
iph->ttl = ttl;
iph->protocol = sk->sk_protocol;
- iph->saddr = rt->rt_src;
- iph->daddr = rt->rt_dst;
+ iph->saddr = fl4->saddr;
+ iph->daddr = fl4->daddr;
skb->priority = sk->sk_priority;
skb->mark = sk->sk_mark;
@@ -1370,11 +1371,11 @@ int ip_send_skb(struct sk_buff *skb)
return err;
}
-int ip_push_pending_frames(struct sock *sk)
+int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4)
{
struct sk_buff *skb;
- skb = ip_finish_skb(sk);
+ skb = ip_finish_skb(sk, fl4);
if (!skb)
return 0;
@@ -1403,6 +1404,7 @@ void ip_flush_pending_frames(struct sock *sk)
}
struct sk_buff *ip_make_skb(struct sock *sk,
+ struct flowi4 *fl4,
int getfrag(void *from, char *to, int offset,
int len, int odd, struct sk_buff *skb),
void *from, int length, int transhdrlen,
@@ -1432,7 +1434,7 @@ struct sk_buff *ip_make_skb(struct sock *sk,
return ERR_PTR(err);
}
- return __ip_make_skb(sk, &queue, &cork);
+ return __ip_make_skb(sk, fl4, &queue, &cork);
}
/*
@@ -1461,6 +1463,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
struct inet_sock *inet = inet_sk(sk);
struct ip_options_data replyopts;
struct ipcm_cookie ipc;
+ struct flowi4 fl4;
__be32 daddr;
struct rtable *rt = skb_rtable(skb);
@@ -1478,20 +1481,16 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
daddr = replyopts.opt.opt.faddr;
}
- {
- struct flowi4 fl4;
-
- flowi4_init_output(&fl4, arg->bound_dev_if, 0,
- RT_TOS(ip_hdr(skb)->tos),
- RT_SCOPE_UNIVERSE, sk->sk_protocol,
- ip_reply_arg_flowi_flags(arg),
- daddr, rt->rt_spec_dst,
- tcp_hdr(skb)->source, tcp_hdr(skb)->dest);
- security_skb_classify_flow(skb, flowi4_to_flowi(&fl4));
- rt = ip_route_output_key(sock_net(sk), &fl4);
- if (IS_ERR(rt))
- return;
- }
+ flowi4_init_output(&fl4, arg->bound_dev_if, 0,
+ RT_TOS(ip_hdr(skb)->tos),
+ RT_SCOPE_UNIVERSE, sk->sk_protocol,
+ ip_reply_arg_flowi_flags(arg),
+ daddr, rt->rt_spec_dst,
+ tcp_hdr(skb)->source, tcp_hdr(skb)->dest);
+ security_skb_classify_flow(skb, flowi4_to_flowi(&fl4));
+ rt = ip_route_output_key(sock_net(sk), &fl4);
+ if (IS_ERR(rt))
+ return;
/* And let IP do all the hard work.
@@ -1512,7 +1511,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
arg->csumoffset) = csum_fold(csum_add(skb->csum,
arg->csum));
skb->ip_summed = CHECKSUM_NONE;
- ip_push_pending_frames(sk);
+ ip_push_pending_frames(sk, &fl4);
}
bh_unlock_sock(sk);
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index a8659e0..6fee91f 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -314,9 +314,10 @@ int raw_rcv(struct sock *sk, struct sk_buff *skb)
return 0;
}
-static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
- struct rtable **rtp,
- unsigned int flags)
+static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
+ void *from, size_t length,
+ struct rtable **rtp,
+ unsigned int flags)
{
struct inet_sock *inet = inet_sk(sk);
struct net *net = sock_net(sk);
@@ -327,7 +328,7 @@ static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
struct rtable *rt = *rtp;
if (length > rt->dst.dev->mtu) {
- ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->inet_dport,
+ ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
rt->dst.dev->mtu);
return -EMSGSIZE;
}
@@ -372,7 +373,7 @@ static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
if (iphlen >= sizeof(*iph)) {
if (!iph->saddr)
- iph->saddr = rt->rt_src;
+ iph->saddr = fl4->saddr;
iph->check = 0;
iph->tot_len = htons(length);
if (!iph->id)
@@ -455,6 +456,7 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
struct inet_sock *inet = inet_sk(sk);
struct ipcm_cookie ipc;
struct rtable *rt = NULL;
+ struct flowi4 fl4;
int free = 0;
__be32 daddr;
__be32 saddr;
@@ -558,27 +560,23 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
saddr = inet->mc_addr;
}
- {
- struct flowi4 fl4;
+ flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
+ RT_SCOPE_UNIVERSE,
+ inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
+ FLOWI_FLAG_CAN_SLEEP, daddr, saddr, 0, 0);
- flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
- RT_SCOPE_UNIVERSE,
- inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
- FLOWI_FLAG_CAN_SLEEP, daddr, saddr, 0, 0);
-
- if (!inet->hdrincl) {
- err = raw_probe_proto_opt(&fl4, msg);
- if (err)
- goto done;
- }
-
- security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
- rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
- if (IS_ERR(rt)) {
- err = PTR_ERR(rt);
- rt = NULL;
+ if (!inet->hdrincl) {
+ err = raw_probe_proto_opt(&fl4, msg);
+ if (err)
goto done;
- }
+ }
+
+ security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
+ rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
+ if (IS_ERR(rt)) {
+ err = PTR_ERR(rt);
+ rt = NULL;
+ goto done;
}
err = -EACCES;
@@ -590,19 +588,20 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
back_from_confirm:
if (inet->hdrincl)
- err = raw_send_hdrinc(sk, msg->msg_iov, len,
- &rt, msg->msg_flags);
+ err = raw_send_hdrinc(sk, &fl4, msg->msg_iov, len,
+ &rt, msg->msg_flags);
else {
if (!ipc.addr)
- ipc.addr = rt->rt_dst;
+ ipc.addr = fl4.daddr;
lock_sock(sk);
- err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
- &ipc, &rt, msg->msg_flags);
+ err = ip_append_data(sk, ip_generic_getfrag,
+ msg->msg_iov, len, 0,
+ &ipc, &rt, msg->msg_flags);
if (err)
ip_flush_pending_frames(sk);
else if (!(msg->msg_flags & MSG_MORE)) {
- err = ip_push_pending_frames(sk);
+ err = ip_push_pending_frames(sk, &fl4);
if (err == -ENOBUFS && !inet->recverr)
err = 0;
}
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index ba9f137..006e2cc 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -774,7 +774,7 @@ static int udp_push_pending_frames(struct sock *sk)
struct sk_buff *skb;
int err = 0;
- skb = ip_finish_skb(sk);
+ skb = ip_finish_skb(sk, fl4);
if (!skb)
goto out;
@@ -958,7 +958,7 @@ back_from_confirm:
/* Lockless fast path for the non-corking case. */
if (!corkreq) {
- skb = ip_make_skb(sk, getfrag, msg->msg_iov, ulen,
+ skb = ip_make_skb(sk, fl4, getfrag, msg->msg_iov, ulen,
sizeof(struct udphdr), &ipc, &rt,
msg->msg_flags);
err = PTR_ERR(skb);
--
1.7.5.1
--
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