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ipv4: drop fragmentation code from ip_options_build()

Browse source 
Since v2.5.44 and addition of ip_options_fragment()
ip_options_build() does not render headers for fragments
directly. @is_frag is always 0.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2022-01-28 08:06:54 -08:00 committed by David S. Miller
parent ff58831fa0
commit 4f0e30407e
3 changed files with 13 additions and 26 deletions
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2
include/net/ip.h
View file

@ -712,7 +712,7 @@ int ip_forward(struct sk_buff *skb);
*/
void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
__be32 daddr, struct rtable *rt, int is_frag);
__be32 daddr, struct rtable *rt);
int __ip_options_echo(struct net *net, struct ip_options *dopt,
struct sk_buff *skb, const struct ip_options *sopt);

31
net/ipv4/ip_options.c
View file

@ -42,7 +42,7 @@
*/
void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
__be32 daddr, struct rtable *rt, int is_frag)
__be32 daddr, struct rtable *rt)
{
unsigned char *iph = skb_network_header(skb);
@ -53,28 +53,15 @@ void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
if (opt->srr)
memcpy(iph + opt->srr + iph[opt->srr + 1] - 4, &daddr, 4);
if (!is_frag) {
if (opt->rr_needaddr)
ip_rt_get_source(iph + opt->rr + iph[opt->rr + 2] - 5, skb, rt);
if (opt->ts_needaddr)
ip_rt_get_source(iph + opt->ts + iph[opt->ts + 2] - 9, skb, rt);
if (opt->ts_needtime) {
__be32 midtime;
if (opt->rr_needaddr)
ip_rt_get_source(iph + opt->rr + iph[opt->rr + 2] - 5, skb, rt);
if (opt->ts_needaddr)
ip_rt_get_source(iph + opt->ts + iph[opt->ts + 2] - 9, skb, rt);
if (opt->ts_needtime) {
__be32 midtime;
midtime = inet_current_timestamp();
memcpy(iph + opt->ts + iph[opt->ts + 2] - 5, &midtime, 4);
}
return;
}
if (opt->rr) {
memset(iph + opt->rr, IPOPT_NOP, iph[opt->rr + 1]);
opt->rr = 0;
opt->rr_needaddr = 0;
}
if (opt->ts) {
memset(iph + opt->ts, IPOPT_NOP, iph[opt->ts + 1]);
opt->ts = 0;
opt->ts_needaddr = opt->ts_needtime = 0;
midtime = inet_current_timestamp();
memcpy(iph + opt->ts + iph[opt->ts + 2] - 5, &midtime, 4);
}
}

6
net/ipv4/ip_output.c
View file

@ -179,7 +179,7 @@ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
if (opt && opt->opt.optlen) {
iph->ihl += opt->opt.optlen>>2;
ip_options_build(skb, &opt->opt, daddr, rt, 0);
ip_options_build(skb, &opt->opt, daddr, rt);
}
skb->priority = sk->sk_priority;
@ -519,7 +519,7 @@ int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
if (inet_opt && inet_opt->opt.optlen) {
iph->ihl += inet_opt->opt.optlen >> 2;
ip_options_build(skb, &inet_opt->opt, inet->inet_daddr, rt, 0);
ip_options_build(skb, &inet_opt->opt, inet->inet_daddr, rt);
}
ip_select_ident_segs(net, skb, sk,
@ -1541,7 +1541,7 @@ struct sk_buff *__ip_make_skb(struct sock *sk,
if (opt) {
iph->ihl += opt->optlen >> 2;
ip_options_build(skb, opt, cork->addr, rt, 0);
ip_options_build(skb, opt, cork->addr, rt);
}
skb->priority = (cork->tos != -1) ? cork->priority: sk->sk_priority;