diff options
Diffstat (limited to 'net/psample')
| -rw-r--r-- | net/psample/psample.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/net/psample/psample.c b/net/psample/psample.c index 6f2fbc6b9eb2..34a74043840b 100644 --- a/net/psample/psample.c +++ b/net/psample/psample.c @@ -14,6 +14,8 @@ #include <net/genetlink.h> #include <net/psample.h> #include <linux/spinlock.h> +#include <net/ip_tunnels.h> +#include <net/dst_metadata.h> #define PSAMPLE_MAX_PACKET_SIZE 0xffff @@ -207,10 +209,155 @@ void psample_group_put(struct psample_group *group) } EXPORT_SYMBOL_GPL(psample_group_put); +static int __psample_ip_tun_to_nlattr(struct sk_buff *skb, + struct ip_tunnel_info *tun_info) +{ + unsigned short tun_proto = ip_tunnel_info_af(tun_info); + const void *tun_opts = ip_tunnel_info_opts(tun_info); + const struct ip_tunnel_key *tun_key = &tun_info->key; + int tun_opts_len = tun_info->options_len; + + if (tun_key->tun_flags & TUNNEL_KEY && + nla_put_be64(skb, PSAMPLE_TUNNEL_KEY_ATTR_ID, tun_key->tun_id, + PSAMPLE_TUNNEL_KEY_ATTR_PAD)) + return -EMSGSIZE; + + if (tun_info->mode & IP_TUNNEL_INFO_BRIDGE && + nla_put_flag(skb, PSAMPLE_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE)) + return -EMSGSIZE; + + switch (tun_proto) { + case AF_INET: + if (tun_key->u.ipv4.src && + nla_put_in_addr(skb, PSAMPLE_TUNNEL_KEY_ATTR_IPV4_SRC, + tun_key->u.ipv4.src)) + return -EMSGSIZE; + if (tun_key->u.ipv4.dst && + nla_put_in_addr(skb, PSAMPLE_TUNNEL_KEY_ATTR_IPV4_DST, + tun_key->u.ipv4.dst)) + return -EMSGSIZE; + break; + case AF_INET6: + if (!ipv6_addr_any(&tun_key->u.ipv6.src) && + nla_put_in6_addr(skb, PSAMPLE_TUNNEL_KEY_ATTR_IPV6_SRC, + &tun_key->u.ipv6.src)) + return -EMSGSIZE; + if (!ipv6_addr_any(&tun_key->u.ipv6.dst) && + nla_put_in6_addr(skb, PSAMPLE_TUNNEL_KEY_ATTR_IPV6_DST, + &tun_key->u.ipv6.dst)) + return -EMSGSIZE; + break; + } + if (tun_key->tos && + nla_put_u8(skb, PSAMPLE_TUNNEL_KEY_ATTR_TOS, tun_key->tos)) + return -EMSGSIZE; + if (nla_put_u8(skb, PSAMPLE_TUNNEL_KEY_ATTR_TTL, tun_key->ttl)) + return -EMSGSIZE; + if ((tun_key->tun_flags & TUNNEL_DONT_FRAGMENT) && + nla_put_flag(skb, PSAMPLE_TUNNEL_KEY_ATTR_DONT_FRAGMENT)) + return -EMSGSIZE; + if ((tun_key->tun_flags & TUNNEL_CSUM) && + nla_put_flag(skb, PSAMPLE_TUNNEL_KEY_ATTR_CSUM)) + return -EMSGSIZE; + if (tun_key->tp_src && + nla_put_be16(skb, PSAMPLE_TUNNEL_KEY_ATTR_TP_SRC, tun_key->tp_src)) + return -EMSGSIZE; + if (tun_key->tp_dst && + nla_put_be16(skb, PSAMPLE_TUNNEL_KEY_ATTR_TP_DST, tun_key->tp_dst)) + return -EMSGSIZE; + if ((tun_key->tun_flags & TUNNEL_OAM) && + nla_put_flag(skb, PSAMPLE_TUNNEL_KEY_ATTR_OAM)) + return -EMSGSIZE; + if (tun_opts_len) { + if (tun_key->tun_flags & TUNNEL_GENEVE_OPT && + nla_put(skb, PSAMPLE_TUNNEL_KEY_ATTR_GENEVE_OPTS, + tun_opts_len, tun_opts)) + return -EMSGSIZE; + else if (tun_key->tun_flags & TUNNEL_ERSPAN_OPT && + nla_put(skb, PSAMPLE_TUNNEL_KEY_ATTR_ERSPAN_OPTS, + tun_opts_len, tun_opts)) + return -EMSGSIZE; + } + + return 0; +} + +static int psample_ip_tun_to_nlattr(struct sk_buff *skb, + struct ip_tunnel_info *tun_info) +{ + struct nlattr *nla; + int err; + + nla = nla_nest_start_noflag(skb, PSAMPLE_ATTR_TUNNEL); + if (!nla) + return -EMSGSIZE; + + err = __psample_ip_tun_to_nlattr(skb, tun_info); + if (err) { + nla_nest_cancel(skb, nla); + return err; + } + + nla_nest_end(skb, nla); + + return 0; +} + +static int psample_tunnel_meta_len(struct ip_tunnel_info *tun_info) +{ + unsigned short tun_proto = ip_tunnel_info_af(tun_info); + const struct ip_tunnel_key *tun_key = &tun_info->key; + int tun_opts_len = tun_info->options_len; + int sum = 0; + + if (tun_key->tun_flags & TUNNEL_KEY) + sum += nla_total_size(sizeof(u64)); + + if (tun_info->mode & IP_TUNNEL_INFO_BRIDGE) + sum += nla_total_size(0); + + switch (tun_proto) { + case AF_INET: + if (tun_key->u.ipv4.src) + sum += nla_total_size(sizeof(u32)); + if (tun_key->u.ipv4.dst) + sum += nla_total_size(sizeof(u32)); + break; + case AF_INET6: + if (!ipv6_addr_any(&tun_key->u.ipv6.src)) + sum += nla_total_size(sizeof(struct in6_addr)); + if (!ipv6_addr_any(&tun_key->u.ipv6.dst)) + sum += nla_total_size(sizeof(struct in6_addr)); + break; + } + if (tun_key->tos) + sum += nla_total_size(sizeof(u8)); + sum += nla_total_size(sizeof(u8)); /* TTL */ + if (tun_key->tun_flags & TUNNEL_DONT_FRAGMENT) + sum += nla_total_size(0); + if (tun_key->tun_flags & TUNNEL_CSUM) + sum += nla_total_size(0); + if (tun_key->tp_src) + sum += nla_total_size(sizeof(u16)); + if (tun_key->tp_dst) + sum += nla_total_size(sizeof(u16)); + if (tun_key->tun_flags & TUNNEL_OAM) + sum += nla_total_size(0); + if (tun_opts_len) { + if (tun_key->tun_flags & TUNNEL_GENEVE_OPT) + sum += nla_total_size(tun_opts_len); + else if (tun_key->tun_flags & TUNNEL_ERSPAN_OPT) + sum += nla_total_size(tun_opts_len); + } + + return sum; +} + void psample_sample_packet(struct psample_group *group, struct sk_buff *skb, u32 trunc_size, int in_ifindex, int out_ifindex, u32 sample_rate) { + struct ip_tunnel_info *tun_info; struct sk_buff *nl_skb; int data_len; int meta_len; @@ -224,6 +371,10 @@ void psample_sample_packet(struct psample_group *group, struct sk_buff *skb, nla_total_size(sizeof(u32)) + /* group_num */ nla_total_size(sizeof(u32)); /* seq */ + tun_info = skb_tunnel_info(skb); + if (tun_info) + meta_len += psample_tunnel_meta_len(tun_info); + data_len = min(skb->len, trunc_size); if (meta_len + nla_total_size(data_len) > PSAMPLE_MAX_PACKET_SIZE) data_len = PSAMPLE_MAX_PACKET_SIZE - meta_len - NLA_HDRLEN @@ -278,6 +429,12 @@ void psample_sample_packet(struct psample_group *group, struct sk_buff *skb, goto error; } + if (tun_info) { + ret = psample_ip_tun_to_nlattr(nl_skb, tun_info); + if (unlikely(ret < 0)) + goto error; + } + genlmsg_end(nl_skb, data); genlmsg_multicast_netns(&psample_nl_family, group->net, nl_skb, 0, PSAMPLE_NL_MCGRP_SAMPLE, GFP_ATOMIC); |