diff options
Diffstat (limited to 'net/core/flow_dissector.c')
| -rw-r--r-- | net/core/flow_dissector.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c index e187bf06d67..00ee068efc1 100644 --- a/net/core/flow_dissector.c +++ b/net/core/flow_dissector.c @@ -5,6 +5,10 @@ #include <linux/if_vlan.h> #include <net/ip.h> #include <net/ipv6.h> +#include <linux/igmp.h> +#include <linux/icmp.h> +#include <linux/sctp.h> +#include <linux/dccp.h> #include <linux/if_tunnel.h> #include <linux/if_pppox.h> #include <linux/ppp_defs.h> @@ -119,6 +123,17 @@ ipv6: nhoff += 4; if (hdr->flags & GRE_SEQ) nhoff += 4; + if (proto == htons(ETH_P_TEB)) { + const struct ethhdr *eth; + struct ethhdr _eth; + + eth = skb_header_pointer(skb, nhoff, + sizeof(_eth), &_eth); + if (!eth) + return false; + proto = eth->h_proto; + nhoff += sizeof(*eth); + } goto again; } break; @@ -217,6 +232,59 @@ u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb, } EXPORT_SYMBOL(__skb_tx_hash); +/* __skb_get_poff() returns the offset to the payload as far as it could + * be dissected. The main user is currently BPF, so that we can dynamically + * truncate packets without needing to push actual payload to the user + * space and can analyze headers only, instead. + */ +u32 __skb_get_poff(const struct sk_buff *skb) +{ + struct flow_keys keys; + u32 poff = 0; + + if (!skb_flow_dissect(skb, &keys)) + return 0; + + poff += keys.thoff; + switch (keys.ip_proto) { + case IPPROTO_TCP: { + const struct tcphdr *tcph; + struct tcphdr _tcph; + + tcph = skb_header_pointer(skb, poff, sizeof(_tcph), &_tcph); + if (!tcph) + return poff; + + poff += max_t(u32, sizeof(struct tcphdr), tcph->doff * 4); + break; + } + case IPPROTO_UDP: + case IPPROTO_UDPLITE: + poff += sizeof(struct udphdr); + break; + /* For the rest, we do not really care about header + * extensions at this point for now. + */ + case IPPROTO_ICMP: + poff += sizeof(struct icmphdr); + break; + case IPPROTO_ICMPV6: + poff += sizeof(struct icmp6hdr); + break; + case IPPROTO_IGMP: + poff += sizeof(struct igmphdr); + break; + case IPPROTO_DCCP: + poff += sizeof(struct dccp_hdr); + break; + case IPPROTO_SCTP: + poff += sizeof(struct sctphdr); + break; + } + + return poff; +} + static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index) { if (unlikely(queue_index >= dev->real_num_tx_queues)) { |