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Diffstat (limited to 'net/ipv4/ip_output.c')
-rw-r--r--net/ipv4/ip_output.c33
1 files changed, 22 insertions, 11 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 3982eabf61e1..912402752f2f 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -810,7 +810,7 @@ static int __ip_append_data(struct sock *sk,
int copy;
int err;
int offset = 0;
- unsigned int maxfraglen, fragheaderlen;
+ unsigned int maxfraglen, fragheaderlen, maxnonfragsize;
int csummode = CHECKSUM_NONE;
struct rtable *rt = (struct rtable *)cork->dst;
@@ -823,8 +823,10 @@ static int __ip_append_data(struct sock *sk,
fragheaderlen = sizeof(struct iphdr) + (opt ? opt->optlen : 0);
maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen;
+ maxnonfragsize = (inet->pmtudisc >= IP_PMTUDISC_DO) ?
+ mtu : 0xFFFF;
- if (cork->length + length > 0xFFFF - fragheaderlen) {
+ if (cork->length + length > maxnonfragsize - fragheaderlen) {
ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
mtu-exthdrlen);
return -EMSGSIZE;
@@ -1035,7 +1037,6 @@ error:
static int ip_setup_cork(struct sock *sk, struct inet_cork *cork,
struct ipcm_cookie *ipc, struct rtable **rtp)
{
- struct inet_sock *inet = inet_sk(sk);
struct ip_options_rcu *opt;
struct rtable *rt;
@@ -1061,10 +1062,13 @@ static int ip_setup_cork(struct sock *sk, struct inet_cork *cork,
* We steal reference to this route, caller should not release it
*/
*rtp = NULL;
- cork->fragsize = inet->pmtudisc == IP_PMTUDISC_PROBE ?
- rt->dst.dev->mtu : dst_mtu(&rt->dst);
+ cork->fragsize = ip_sk_use_pmtu(sk) ?
+ dst_mtu(&rt->dst) : rt->dst.dev->mtu;
cork->dst = &rt->dst;
cork->length = 0;
+ cork->ttl = ipc->ttl;
+ cork->tos = ipc->tos;
+ cork->priority = ipc->priority;
cork->tx_flags = ipc->tx_flags;
return 0;
@@ -1119,7 +1123,7 @@ ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
int mtu;
int len;
int err;
- unsigned int maxfraglen, fragheaderlen, fraggap;
+ unsigned int maxfraglen, fragheaderlen, fraggap, maxnonfragsize;
if (inet->hdrincl)
return -EPERM;
@@ -1143,8 +1147,10 @@ ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
fragheaderlen = sizeof(struct iphdr) + (opt ? opt->optlen : 0);
maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen;
+ maxnonfragsize = (inet->pmtudisc >= IP_PMTUDISC_DO) ?
+ mtu : 0xFFFF;
- if (cork->length + size > 0xFFFF - fragheaderlen) {
+ if (cork->length + size > maxnonfragsize - fragheaderlen) {
ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, mtu);
return -EMSGSIZE;
}
@@ -1308,7 +1314,8 @@ struct sk_buff *__ip_make_skb(struct sock *sk,
/* DF bit is set when we want to see DF on outgoing frames.
* If local_df is set too, we still allow to fragment this frame
* locally. */
- if (inet->pmtudisc >= IP_PMTUDISC_DO ||
+ if (inet->pmtudisc == IP_PMTUDISC_DO ||
+ inet->pmtudisc == IP_PMTUDISC_PROBE ||
(skb->len <= dst_mtu(&rt->dst) &&
ip_dont_fragment(sk, &rt->dst)))
df = htons(IP_DF);
@@ -1316,7 +1323,9 @@ struct sk_buff *__ip_make_skb(struct sock *sk,
if (cork->flags & IPCORK_OPT)
opt = cork->opt;
- if (rt->rt_type == RTN_MULTICAST)
+ if (cork->ttl != 0)
+ ttl = cork->ttl;
+ else if (rt->rt_type == RTN_MULTICAST)
ttl = inet->mc_ttl;
else
ttl = ip_select_ttl(inet, &rt->dst);
@@ -1324,7 +1333,7 @@ struct sk_buff *__ip_make_skb(struct sock *sk,
iph = ip_hdr(skb);
iph->version = 4;
iph->ihl = 5;
- iph->tos = inet->tos;
+ iph->tos = (cork->tos != -1) ? cork->tos : inet->tos;
iph->frag_off = df;
iph->ttl = ttl;
iph->protocol = sk->sk_protocol;
@@ -1336,7 +1345,7 @@ struct sk_buff *__ip_make_skb(struct sock *sk,
ip_options_build(skb, opt, cork->addr, rt, 0);
}
- skb->priority = sk->sk_priority;
+ skb->priority = (cork->tos != -1) ? cork->priority: sk->sk_priority;
skb->mark = sk->sk_mark;
/*
* Steal rt from cork.dst to avoid a pair of atomic_inc/atomic_dec
@@ -1486,6 +1495,8 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
ipc.addr = daddr;
ipc.opt = NULL;
ipc.tx_flags = 0;
+ ipc.ttl = 0;
+ ipc.tos = -1;
if (replyopts.opt.opt.optlen) {
ipc.opt = &replyopts.opt;