diff options
author | Scott Wood <scottwood@freescale.com> | 2014-04-10 00:49:54 (GMT) |
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committer | Scott Wood <scottwood@freescale.com> | 2014-04-10 00:49:54 (GMT) |
commit | b86c95253af2105c9824146c6569a6b0f39ab124 (patch) | |
tree | 9100acbdc843b1081b154135000b89ee95cd10d3 /net/ipv4 | |
parent | e5feac72dad5475167445de9af564c2d592872bb (diff) | |
parent | 07c8b57b111585a617b2b456497fc9b33c00743c (diff) | |
download | linux-fsl-qoriq-b86c95253af2105c9824146c6569a6b0f39ab124.tar.xz |
Merge branch 'rtmerge' into sdk-v1.6.x
This merges 3.12.15-rt25.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Conflicts:
drivers/misc/Makefile
drivers/net/ethernet/freescale/gianfar.c
drivers/net/ethernet/freescale/gianfar_ethtool.c
drivers/net/ethernet/freescale/gianfar_sysfs.c
Diffstat (limited to 'net/ipv4')
-rw-r--r-- | net/ipv4/icmp.c | 30 | ||||
-rw-r--r-- | net/ipv4/ip_output.c | 8 | ||||
-rw-r--r-- | net/ipv4/sysctl_net_ipv4.c | 7 |
3 files changed, 43 insertions, 2 deletions
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index 5f7d11a..1f0c7e0 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -69,6 +69,7 @@ #include <linux/jiffies.h> #include <linux/kernel.h> #include <linux/fcntl.h> +#include <linux/sysrq.h> #include <linux/socket.h> #include <linux/in.h> #include <linux/inet.h> @@ -776,6 +777,30 @@ static void icmp_redirect(struct sk_buff *skb) } /* + * 32bit and 64bit have different timestamp length, so we check for + * the cookie at offset 20 and verify it is repeated at offset 50 + */ +#define CO_POS0 20 +#define CO_POS1 50 +#define CO_SIZE sizeof(int) +#define ICMP_SYSRQ_SIZE 57 + +/* + * We got a ICMP_SYSRQ_SIZE sized ping request. Check for the cookie + * pattern and if it matches send the next byte as a trigger to sysrq. + */ +static void icmp_check_sysrq(struct net *net, struct sk_buff *skb) +{ + int cookie = htonl(net->ipv4.sysctl_icmp_echo_sysrq); + char *p = skb->data; + + if (!memcmp(&cookie, p + CO_POS0, CO_SIZE) && + !memcmp(&cookie, p + CO_POS1, CO_SIZE) && + p[CO_POS0 + CO_SIZE] == p[CO_POS1 + CO_SIZE]) + handle_sysrq(p[CO_POS0 + CO_SIZE]); +} + +/* * Handle ICMP_ECHO ("ping") requests. * * RFC 1122: 3.2.2.6 MUST have an echo server that answers ICMP echo @@ -802,6 +827,11 @@ static void icmp_echo(struct sk_buff *skb) icmp_param.data_len = skb->len; icmp_param.head_len = sizeof(struct icmphdr); icmp_reply(&icmp_param, skb); + + if (skb->len == ICMP_SYSRQ_SIZE && + net->ipv4.sysctl_icmp_echo_sysrq) { + icmp_check_sysrq(net, skb); + } } } diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index 3982eab..8bb3b4a 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -79,6 +79,7 @@ #include <linux/mroute.h> #include <linux/netlink.h> #include <linux/tcp.h> +#include <linux/locallock.h> int sysctl_ip_default_ttl __read_mostly = IPDEFTTL; EXPORT_SYMBOL(sysctl_ip_default_ttl); @@ -1468,6 +1469,9 @@ static DEFINE_PER_CPU(struct inet_sock, unicast_sock) = { .uc_ttl = -1, }; +/* serialize concurrent calls on the same CPU to ip_send_unicast_reply */ +static DEFINE_LOCAL_IRQ_LOCK(unicast_lock); + void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, __be32 saddr, const struct ip_reply_arg *arg, unsigned int len) @@ -1505,7 +1509,7 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, if (IS_ERR(rt)) return; - inet = &get_cpu_var(unicast_sock); + inet = &get_locked_var(unicast_lock, unicast_sock); inet->tos = arg->tos; sk = &inet->sk; @@ -1529,7 +1533,7 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, ip_push_pending_frames(sk, &fl4); } - put_cpu_var(unicast_sock); + put_locked_var(unicast_lock, unicast_sock); ip_rt_put(rt); } diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index 540279f..99461ed 100644 --- a/net/ipv4/sysctl_net_ipv4.c +++ b/net/ipv4/sysctl_net_ipv4.c @@ -812,6 +812,13 @@ static struct ctl_table ipv4_net_table[] = { .proc_handler = proc_dointvec }, { + .procname = "icmp_echo_sysrq", + .data = &init_net.ipv4.sysctl_icmp_echo_sysrq, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, + { .procname = "icmp_ignore_bogus_error_responses", .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses, .maxlen = sizeof(int), |