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Diffstat (limited to 'net/ipv6/ip6_output.c')
-rw-r--r--net/ipv6/ip6_output.c108
1 files changed, 81 insertions, 27 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index e17596b8407a..ae9f6d436171 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -100,6 +100,8 @@ static int ip6_finish_output2(struct sk_buff *skb)
{
struct dst_entry *dst = skb_dst(skb);
struct net_device *dev = dst->dev;
+ struct neighbour *neigh;
+ int res;
skb->protocol = htons(ETH_P_IPV6);
skb->dev = dev;
@@ -134,10 +136,22 @@ static int ip6_finish_output2(struct sk_buff *skb)
skb->len);
}
- if (dst->hh)
- return neigh_hh_output(dst->hh, skb);
- else if (dst->neighbour)
- return dst->neighbour->output(skb);
+ rcu_read_lock();
+ if (dst->hh) {
+ res = neigh_hh_output(dst->hh, skb);
+
+ rcu_read_unlock();
+ return res;
+ } else {
+ neigh = dst_get_neighbour(dst);
+ if (neigh) {
+ res = neigh->output(skb);
+
+ rcu_read_unlock();
+ return res;
+ }
+ rcu_read_unlock();
+ }
IP6_INC_STATS_BH(dev_net(dst->dev),
ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
@@ -385,6 +399,7 @@ int ip6_forward(struct sk_buff *skb)
struct ipv6hdr *hdr = ipv6_hdr(skb);
struct inet6_skb_parm *opt = IP6CB(skb);
struct net *net = dev_net(dst->dev);
+ struct neighbour *n;
u32 mtu;
if (net->ipv6.devconf_all->forwarding == 0)
@@ -459,11 +474,10 @@ int ip6_forward(struct sk_buff *skb)
send redirects to source routed frames.
We don't send redirects to frames decapsulated from IPsec.
*/
- if (skb->dev == dst->dev && dst->neighbour && opt->srcrt == 0 &&
- !skb_sec_path(skb)) {
+ n = dst_get_neighbour(dst);
+ if (skb->dev == dst->dev && n && opt->srcrt == 0 && !skb_sec_path(skb)) {
struct in6_addr *target = NULL;
struct rt6_info *rt;
- struct neighbour *n = dst->neighbour;
/*
* incoming and outgoing devices are the same
@@ -949,8 +963,11 @@ out:
static int ip6_dst_lookup_tail(struct sock *sk,
struct dst_entry **dst, struct flowi6 *fl6)
{
- int err;
struct net *net = sock_net(sk);
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ struct neighbour *n;
+#endif
+ int err;
if (*dst == NULL)
*dst = ip6_route_output(net, sk, fl6);
@@ -976,11 +993,14 @@ static int ip6_dst_lookup_tail(struct sock *sk,
* dst entry and replace it instead with the
* dst entry of the nexthop router
*/
- if ((*dst)->neighbour && !((*dst)->neighbour->nud_state & NUD_VALID)) {
+ rcu_read_lock();
+ n = dst_get_neighbour(*dst);
+ if (n && !(n->nud_state & NUD_VALID)) {
struct inet6_ifaddr *ifp;
struct flowi6 fl_gw6;
int redirect;
+ rcu_read_unlock();
ifp = ipv6_get_ifaddr(net, &fl6->saddr,
(*dst)->dev, 1);
@@ -1000,6 +1020,8 @@ static int ip6_dst_lookup_tail(struct sock *sk,
if ((err = (*dst)->error))
goto out_err_release;
}
+ } else {
+ rcu_read_unlock();
}
#endif
@@ -1172,6 +1194,29 @@ static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src,
return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
}
+static void ip6_append_data_mtu(int *mtu,
+ int *maxfraglen,
+ unsigned int fragheaderlen,
+ struct sk_buff *skb,
+ struct rt6_info *rt)
+{
+ if (!(rt->dst.flags & DST_XFRM_TUNNEL)) {
+ if (skb == NULL) {
+ /* first fragment, reserve header_len */
+ *mtu = *mtu - rt->dst.header_len;
+
+ } else {
+ /*
+ * this fragment is not first, the headers
+ * space is regarded as data space.
+ */
+ *mtu = dst_mtu(rt->dst.path);
+ }
+ *maxfraglen = ((*mtu - fragheaderlen) & ~7)
+ + fragheaderlen - sizeof(struct frag_hdr);
+ }
+}
+
int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
int offset, int len, int odd, struct sk_buff *skb),
void *from, int length, int transhdrlen,
@@ -1181,7 +1226,7 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
struct inet_sock *inet = inet_sk(sk);
struct ipv6_pinfo *np = inet6_sk(sk);
struct inet_cork *cork;
- struct sk_buff *skb;
+ struct sk_buff *skb, *skb_prev = NULL;
unsigned int maxfraglen, fragheaderlen;
int exthdrlen;
int hh_len;
@@ -1238,8 +1283,12 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
inet->cork.fl.u.ip6 = *fl6;
np->cork.hop_limit = hlimit;
np->cork.tclass = tclass;
- mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ?
- rt->dst.dev->mtu : dst_mtu(rt->dst.path);
+ if (rt->dst.flags & DST_XFRM_TUNNEL)
+ mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ?
+ rt->dst.dev->mtu : dst_mtu(&rt->dst);
+ else
+ mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ?
+ rt->dst.dev->mtu : dst_mtu(rt->dst.path);
if (np->frag_size < mtu) {
if (np->frag_size)
mtu = np->frag_size;
@@ -1334,38 +1383,43 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
unsigned int fraglen;
unsigned int fraggap;
unsigned int alloclen;
- struct sk_buff *skb_prev;
alloc_new_skb:
- skb_prev = skb;
-
/* There's no room in the current skb */
- if (skb_prev)
- fraggap = skb_prev->len - maxfraglen;
+ if (skb)
+ fraggap = skb->len - maxfraglen;
else
fraggap = 0;
+ /* update mtu and maxfraglen if necessary */
+ if (skb == NULL || skb_prev == NULL)
+ ip6_append_data_mtu(&mtu, &maxfraglen,
+ fragheaderlen, skb, rt);
+
+ skb_prev = skb;
/*
* If remaining data exceeds the mtu,
* we know we need more fragment(s).
*/
datalen = length + fraggap;
- if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen)
- datalen = maxfraglen - fragheaderlen;
- fraglen = datalen + fragheaderlen;
+ if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen)
+ datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len;
if ((flags & MSG_MORE) &&
!(rt->dst.dev->features&NETIF_F_SG))
alloclen = mtu;
else
alloclen = datalen + fragheaderlen;
- /*
- * The last fragment gets additional space at tail.
- * Note: we overallocate on fragments with MSG_MODE
- * because we have no idea if we're the last one.
- */
- if (datalen == length + fraggap)
- alloclen += rt->dst.trailer_len;
+ if (datalen != length + fraggap) {
+ /*
+ * this is not the last fragment, the trailer
+ * space is regarded as data space.
+ */
+ datalen += rt->dst.trailer_len;
+ }
+
+ alloclen += rt->dst.trailer_len;
+ fraglen = datalen + fragheaderlen;
/*
* We just reserve space for fragment header.
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-15 20:57:22 +0000