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-rw-r--r--net/ipv6/ndisc.c283
1 files changed, 84 insertions, 199 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 4ee1216f801..d8b36451bad 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -427,38 +427,23 @@ static inline void ndisc_flow_init(struct flowi *fl, u8 type,
security_sk_classify_flow(ndisc_socket->sk, fl);
}
-static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
- struct in6_addr *daddr, struct in6_addr *solicited_addr,
- int router, int solicited, int override, int inc_opt)
+static void __ndisc_send(struct net_device *dev,
+ struct neighbour *neigh,
+ struct in6_addr *daddr, struct in6_addr *saddr,
+ struct icmp6hdr *icmp6h, struct in6_addr *target,
+ int llinfo, int icmp6_mib_outnd)
{
- struct in6_addr tmpaddr;
- struct inet6_ifaddr *ifp;
- struct inet6_dev *idev;
struct flowi fl;
- struct dst_entry* dst;
+ struct dst_entry *dst;
struct sock *sk = ndisc_socket->sk;
- struct in6_addr *src_addr;
- struct nd_msg *msg;
- int len;
struct sk_buff *skb;
+ struct icmp6hdr *hdr;
+ struct inet6_dev *idev;
+ int len;
int err;
+ u8 *opt;
- len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
-
- /* for anycast or proxy, solicited_addr != src_addr */
- ifp = ipv6_get_ifaddr(solicited_addr, dev, 1);
- if (ifp) {
- src_addr = solicited_addr;
- if (ifp->flags & IFA_F_OPTIMISTIC)
- override = 0;
- in6_ifa_put(ifp);
- } else {
- if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr))
- return;
- src_addr = &tmpaddr;
- }
-
- ndisc_flow_init(&fl, NDISC_NEIGHBOUR_ADVERTISEMENT, src_addr, daddr,
+ ndisc_flow_init(&fl, icmp6h->icmp6_type, saddr, daddr,
dev->ifindex);
dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output);
@@ -469,61 +454,57 @@ static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
if (err < 0)
return;
- if (inc_opt) {
- if (dev->addr_len)
- len += ndisc_opt_addr_space(dev);
- else
- inc_opt = 0;
- }
+ if (!dev->addr_len)
+ llinfo = 0;
+
+ len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0);
+ if (llinfo)
+ len += ndisc_opt_addr_space(dev);
skb = sock_alloc_send_skb(sk,
(MAX_HEADER + sizeof(struct ipv6hdr) +
len + LL_RESERVED_SPACE(dev)),
1, &err);
-
- if (skb == NULL) {
+ if (!skb) {
ND_PRINTK0(KERN_ERR
- "ICMPv6 NA: %s() failed to allocate an skb.\n",
+ "ICMPv6 ND: %s() failed to allocate an skb.\n",
__FUNCTION__);
dst_release(dst);
return;
}
skb_reserve(skb, LL_RESERVED_SPACE(dev));
- ip6_nd_hdr(sk, skb, dev, src_addr, daddr, IPPROTO_ICMPV6, len);
+ ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
skb->transport_header = skb->tail;
skb_put(skb, len);
- msg = (struct nd_msg *)skb_transport_header(skb);
- msg->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
- msg->icmph.icmp6_code = 0;
- msg->icmph.icmp6_cksum = 0;
+ hdr = (struct icmp6hdr *)skb_transport_header(skb);
+ memcpy(hdr, icmp6h, sizeof(*hdr));
- msg->icmph.icmp6_unused = 0;
- msg->icmph.icmp6_router = router;
- msg->icmph.icmp6_solicited = solicited;
- msg->icmph.icmp6_override = override;
-
- /* Set the target address. */
- ipv6_addr_copy(&msg->target, solicited_addr);
+ opt = skb_transport_header(skb) + sizeof(struct icmp6hdr);
+ if (target) {
+ ipv6_addr_copy((struct in6_addr *)opt, target);
+ opt += sizeof(*target);
+ }
- if (inc_opt)
- ndisc_fill_addr_option(msg->opt, ND_OPT_TARGET_LL_ADDR, dev->dev_addr,
+ if (llinfo)
+ ndisc_fill_addr_option(opt, llinfo, dev->dev_addr,
dev->addr_len, dev->type);
- /* checksum */
- msg->icmph.icmp6_cksum = csum_ipv6_magic(src_addr, daddr, len,
- IPPROTO_ICMPV6,
- csum_partial((__u8 *) msg,
- len, 0));
+ hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len,
+ IPPROTO_ICMPV6,
+ csum_partial((__u8 *) hdr,
+ len, 0));
skb->dst = dst;
+
idev = in6_dev_get(dst->dev);
IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
+
err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
if (!err) {
- ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORADVERTISEMENTS);
+ ICMP6_INC_STATS(idev, icmp6_mib_outnd);
ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
}
@@ -531,20 +512,48 @@ static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
in6_dev_put(idev);
}
+static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
+ struct in6_addr *daddr, struct in6_addr *solicited_addr,
+ int router, int solicited, int override, int inc_opt)
+{
+ struct in6_addr tmpaddr;
+ struct inet6_ifaddr *ifp;
+ struct in6_addr *src_addr;
+ struct icmp6hdr icmp6h = {
+ .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
+ };
+
+ /* for anycast or proxy, solicited_addr != src_addr */
+ ifp = ipv6_get_ifaddr(solicited_addr, dev, 1);
+ if (ifp) {
+ src_addr = solicited_addr;
+ if (ifp->flags & IFA_F_OPTIMISTIC)
+ override = 0;
+ in6_ifa_put(ifp);
+ } else {
+ if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr))
+ return;
+ src_addr = &tmpaddr;
+ }
+
+ icmp6h.icmp6_router = router;
+ icmp6h.icmp6_solicited = solicited;
+ icmp6h.icmp6_override = override;
+
+ __ndisc_send(dev, neigh, daddr, src_addr,
+ &icmp6h, solicited_addr,
+ inc_opt ? ND_OPT_TARGET_LL_ADDR : 0,
+ ICMP6_MIB_OUTNEIGHBORADVERTISEMENTS);
+}
+
void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
struct in6_addr *solicit,
struct in6_addr *daddr, struct in6_addr *saddr)
{
- struct flowi fl;
- struct dst_entry* dst;
- struct inet6_dev *idev;
- struct sock *sk = ndisc_socket->sk;
- struct sk_buff *skb;
- struct nd_msg *msg;
struct in6_addr addr_buf;
- int len;
- int err;
- int send_llinfo;
+ struct icmp6hdr icmp6h = {
+ .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION,
+ };
if (saddr == NULL) {
if (ipv6_get_lladdr(dev, &addr_buf,
@@ -553,86 +562,19 @@ void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
saddr = &addr_buf;
}
- ndisc_flow_init(&fl, NDISC_NEIGHBOUR_SOLICITATION, saddr, daddr,
- dev->ifindex);
-
- dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output);
- if (!dst)
- return;
-
- err = xfrm_lookup(&dst, &fl, NULL, 0);
- if (err < 0)
- return;
-
- len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
- send_llinfo = dev->addr_len && !ipv6_addr_any(saddr);
- if (send_llinfo)
- len += ndisc_opt_addr_space(dev);
-
- skb = sock_alloc_send_skb(sk,
- (MAX_HEADER + sizeof(struct ipv6hdr) +
- len + LL_RESERVED_SPACE(dev)),
- 1, &err);
- if (skb == NULL) {
- ND_PRINTK0(KERN_ERR
- "ICMPv6 NA: %s() failed to allocate an skb.\n",
- __FUNCTION__);
- dst_release(dst);
- return;
- }
-
- skb_reserve(skb, LL_RESERVED_SPACE(dev));
- ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
-
- skb->transport_header = skb->tail;
- skb_put(skb, len);
- msg = (struct nd_msg *)skb_transport_header(skb);
- msg->icmph.icmp6_type = NDISC_NEIGHBOUR_SOLICITATION;
- msg->icmph.icmp6_code = 0;
- msg->icmph.icmp6_cksum = 0;
- msg->icmph.icmp6_unused = 0;
-
- /* Set the target address. */
- ipv6_addr_copy(&msg->target, solicit);
-
- if (send_llinfo)
- ndisc_fill_addr_option(msg->opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr,
- dev->addr_len, dev->type);
-
- /* checksum */
- msg->icmph.icmp6_cksum = csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
- daddr, len,
- IPPROTO_ICMPV6,
- csum_partial((__u8 *) msg,
- len, 0));
- /* send it! */
- skb->dst = dst;
- idev = in6_dev_get(dst->dev);
- IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
- err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
- if (!err) {
- ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORSOLICITS);
- ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
- }
-
- if (likely(idev != NULL))
- in6_dev_put(idev);
+ __ndisc_send(dev, neigh, daddr, saddr,
+ &icmp6h, solicit,
+ !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0,
+ ICMP6_MIB_OUTNEIGHBORSOLICITS);
}
void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
struct in6_addr *daddr)
{
- struct flowi fl;
- struct dst_entry* dst;
- struct inet6_dev *idev;
- struct sock *sk = ndisc_socket->sk;
- struct sk_buff *skb;
- struct icmp6hdr *hdr;
- __u8 * opt;
+ struct icmp6hdr icmp6h = {
+ .icmp6_type = NDISC_ROUTER_SOLICITATION,
+ };
int send_sllao = dev->addr_len;
- int len;
- int err;
-
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
/*
@@ -655,67 +597,10 @@ void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
}
}
#endif
- ndisc_flow_init(&fl, NDISC_ROUTER_SOLICITATION, saddr, daddr,
- dev->ifindex);
-
- dst = ndisc_dst_alloc(dev, NULL, daddr, ip6_output);
- if (!dst)
- return;
-
- err = xfrm_lookup(&dst, &fl, NULL, 0);
- if (err < 0)
- return;
-
- len = sizeof(struct icmp6hdr);
- if (send_sllao)
- len += ndisc_opt_addr_space(dev);
-
- skb = sock_alloc_send_skb(sk,
- (MAX_HEADER + sizeof(struct ipv6hdr) +
- len + LL_RESERVED_SPACE(dev)),
- 1, &err);
- if (skb == NULL) {
- ND_PRINTK0(KERN_ERR
- "ICMPv6 RS: %s() failed to allocate an skb.\n",
- __FUNCTION__);
- dst_release(dst);
- return;
- }
-
- skb_reserve(skb, LL_RESERVED_SPACE(dev));
- ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
-
- skb->transport_header = skb->tail;
- skb_put(skb, len);
- hdr = icmp6_hdr(skb);
- hdr->icmp6_type = NDISC_ROUTER_SOLICITATION;
- hdr->icmp6_code = 0;
- hdr->icmp6_cksum = 0;
- hdr->icmp6_unused = 0;
-
- opt = (u8*) (hdr + 1);
-
- if (send_sllao)
- ndisc_fill_addr_option(opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr,
- dev->addr_len, dev->type);
-
- /* checksum */
- hdr->icmp6_cksum = csum_ipv6_magic(&ipv6_hdr(skb)->saddr, daddr, len,
- IPPROTO_ICMPV6,
- csum_partial((__u8 *) hdr, len, 0));
-
- /* send it! */
- skb->dst = dst;
- idev = in6_dev_get(dst->dev);
- IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
- err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
- if (!err) {
- ICMP6_INC_STATS(idev, ICMP6_MIB_OUTROUTERSOLICITS);
- ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
- }
-
- if (likely(idev != NULL))
- in6_dev_put(idev);
+ __ndisc_send(dev, NULL, daddr, saddr,
+ &icmp6h, NULL,
+ send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0,
+ ICMP6_MIB_OUTROUTERSOLICITS);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-06 18:47:00 +0000