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| author | Nazarov Sergey <s-nazarov@yandex.ru> | 2019-02-25 19:27:15 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-02-25 14:32:35 -0800 |
| commit | 3da1ed7ac398f34fff1694017a07054d69c5f5c5 (patch) | |
| tree | ac42a19c628b81052191fa63e832e3aca6b84df2 | |
| parent | 9ef6b42ad6fd7929dd1b6092cb02014e382c6a91 (diff) | |
| download | linux-3da1ed7ac398f34fff1694017a07054d69c5f5c5.tar.gz linux-3da1ed7ac398f34fff1694017a07054d69c5f5c5.tar.bz2 linux-3da1ed7ac398f34fff1694017a07054d69c5f5c5.zip | |
net: avoid use IPCB in cipso_v4_error
Extract IP options in cipso_v4_error and use __icmp_send.
Signed-off-by: Sergey Nazarov <s-nazarov@yandex.ru>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/net/ip.h | 2 | ||||
| -rw-r--r-- | net/ipv4/cipso_ipv4.c | 17 | ||||
| -rw-r--r-- | net/ipv4/ip_options.c | 22 |
3 files changed, 34 insertions, 7 deletions
diff --git a/include/net/ip.h b/include/net/ip.h index 8866bfce6121..f0e8d064e249 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -667,6 +667,8 @@ static inline int ip_options_echo(struct net *net, struct ip_options *dopt, } void ip_options_fragment(struct sk_buff *skb); +int __ip_options_compile(struct net *net, struct ip_options *opt, + struct sk_buff *skb, __be32 *info); int ip_options_compile(struct net *net, struct ip_options *opt, struct sk_buff *skb); int ip_options_get(struct net *net, struct ip_options_rcu **optp, diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c index 777fa3b7fb13..eff86a71c1b0 100644 --- a/net/ipv4/cipso_ipv4.c +++ b/net/ipv4/cipso_ipv4.c @@ -1735,13 +1735,26 @@ validate_return: */ void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway) { + unsigned char optbuf[sizeof(struct ip_options) + 40]; + struct ip_options *opt = (struct ip_options *)optbuf; + if (ip_hdr(skb)->protocol == IPPROTO_ICMP || error != -EACCES) return; + /* + * We might be called above the IP layer, + * so we can not use icmp_send and IPCB here. + */ + + memset(opt, 0, sizeof(struct ip_options)); + opt->optlen = ip_hdr(skb)->ihl*4 - sizeof(struct iphdr); + if (__ip_options_compile(dev_net(skb->dev), opt, skb, NULL)) + return; + if (gateway) - icmp_send(skb, ICMP_DEST_UNREACH, ICMP_NET_ANO, 0); + __icmp_send(skb, ICMP_DEST_UNREACH, ICMP_NET_ANO, 0, opt); else - icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_ANO, 0); + __icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_ANO, 0, opt); } /** diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c index ed194d46c00e..32a35043c9f5 100644 --- a/net/ipv4/ip_options.c +++ b/net/ipv4/ip_options.c @@ -251,8 +251,9 @@ static void spec_dst_fill(__be32 *spec_dst, struct sk_buff *skb) * If opt == NULL, then skb->data should point to IP header. */ -int ip_options_compile(struct net *net, - struct ip_options *opt, struct sk_buff *skb) +int __ip_options_compile(struct net *net, + struct ip_options *opt, struct sk_buff *skb, + __be32 *info) { __be32 spec_dst = htonl(INADDR_ANY); unsigned char *pp_ptr = NULL; @@ -468,11 +469,22 @@ eol: return 0; error: - if (skb) { - icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((pp_ptr-iph)<<24)); - } + if (info) + *info = htonl((pp_ptr-iph)<<24); return -EINVAL; } + +int ip_options_compile(struct net *net, + struct ip_options *opt, struct sk_buff *skb) +{ + int ret; + __be32 info; + + ret = __ip_options_compile(net, opt, skb, &info); + if (ret != 0 && skb) + icmp_send(skb, ICMP_PARAMETERPROB, 0, info); + return ret; +} EXPORT_SYMBOL(ip_options_compile); /* |