feat: multi-distro VM tests, ja4ebpf eBPF improvements, bot-detector scoring
ja4ebpf: - Refactor BPF TC capture with improved SYN offset handling and TCP option parsing - Enhance TLS uprobe SSL hooking for better key extraction - Add ClickHouse writer improvements for HTTP log materialized views - Update RPM spec for Rocky Linux 8/9/10, fix systemd service - Simplify loader with cleaner bpf2go integration bot-detector: - Add H2 SETTINGS per-parameter comparison in browser_matcher - Enhance browser signatures and scoring pipeline - Improve preprocessing and cycle detection infra: - Multi-distro Vagrantfile (centos8, rocky9, rocky10) with per-distro provisioning - New Makefile targets: vm-up-all, test-vm-matrix, test-vm-centos8/rocky10 - Add debug helpers and run-test-from-host.sh for host-driven VM testing - Update run-tests-vm.sh for cross-distro compatibility - Remove accidental binary blob (\004) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
@ -1,16 +1,18 @@
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/* ============================================================================
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* tc_capture.c — Programme XDP ingress : capture des TCP SYN et TLS ClientHello
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* tc_capture.c — Programme TC ingress : capture des TCP SYN, TLS ClientHello
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* et HTTP en clair
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*
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* Remplace l'ancienne version TC (SCHED_CLS + TCX) par un hook XDP compatible
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* depuis le kernel 4.8. Utilisé en mode XDP_GENERIC sur Rocky Linux 9 (5.14).
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* Hook TC ingress (clsact qdisc) compatible kernel 4.1+.
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* Émet via bpf_perf_event_output() (kernel 4.4+) pour compatibilité maximale.
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*
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* Conventions vérificateur eBPF :
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* - Tous les accès mémoire paquet utilisent de l'arithmétique de pointeur
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* directe avec bornes explicites (data / data_end).
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* - Les copies de longueur variable utilisent des boucles bornées (sans
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* #pragma unroll) : le vérificateur kernel ≥ 5.3 les accepte nativement.
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* - Les options TCP sont copiées brutes ; MSS et Window Scale sont extraits
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* côté Go (userspace) depuis le tableau tcp_options_raw.
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* IMPORTANT : Ce programme n'utilise AUCUN accès direct au paquet (data/data_end).
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* Toutes les lectures se font via bpf_skb_load_bytes() (kernel 4.5+) avec des
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* tailles constantes, pour compatibilité avec le vérificateur kernel 4.18 qui
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* rejette "math between pkt pointer and register with unbounded min value".
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*
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* Les copies de payload utilisent bpf_skb_load_bytes() avec &= (2^n - 1)
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* pour borner la taille per le vérificateur.
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* Les structs > 512o utilisent un PERCPU_ARRAY temporaire (stack limit eBPF).
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* ============================================================================ */
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#include "vmlinux.h"
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@ -19,219 +21,248 @@
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#include <bpf/bpf_core_read.h>
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#include "bpf_types.h"
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/* Constantes Ethernet */
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/* Constantes */
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#define ETH_P_IP 0x0800
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#define ETH_HLEN 14
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/* Constantes IP */
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#define IPPROTO_TCP 6
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#define IP_DF 0x4000
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/* Constantes TCP */
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#define TH_SYN 0x02
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#define TH_ACK 0x10
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#define TH_FIN 0x01
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#define TH_RST 0x04
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/* Ports */
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#define HTTPS_PORT 443
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#define HTTP_PORT 80
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#define HTTP_ALT_PORT 8080
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/* TLS */
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#define TLS_CONTENT_HANDSHAKE 0x16
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#define TLS_MSG_CLIENT_HELLO 0x01
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/* Tailles maximales des payloads copiés */
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#define MAX_TLS_PAYLOAD 2048
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#define MAX_HTTP_PAYLOAD 1024
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#define MAX_TCP_OPTIONS 40
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/* Structure Ethernet locale (évite d'inclure linux/if_ether.h) */
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struct ethhdr_local {
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__u8 h_dest[6];
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__u8 h_source[6];
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__be16 h_proto;
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} __attribute__((packed));
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/* Counter map for debug */
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
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__uint(max_entries, 7);
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__type(key, __u32);
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__type(value, __u64);
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} tc_stats SEC(".maps");
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#define STAT_TOTAL 0
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#define STAT_IPV4 1
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#define STAT_TCP 2
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#define STAT_SYN 3
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#define STAT_SYN_SUBMIT 4
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#define STAT_TLS_SUBMIT 5
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#define STAT_HTTP_SUBMIT 6
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/* ---------------------------------------------------------------------------
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* capture_xdp — Point d'entrée XDP ingress
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* capture_tc — Point d'entrée TC ingress (clsact)
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*
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* Observe chaque paquet ingress en lecture seule (retourne toujours XDP_PASS).
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* Émet des événements vers les ring buffers pour TCP SYN, TLS ClientHello
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* et les payloads HTTP en clair.
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* AUCUN accès direct au paquet. Tout via bpf_skb_load_bytes() + tailles constantes.
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* Compatible vérificateur kernel 4.18.
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* ---------------------------------------------------------------------------*/
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SEC("xdp")
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int capture_xdp(struct xdp_md *ctx)
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SEC("tc")
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int capture_tc(struct __sk_buff *ctx)
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{
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void *data = (void *)(long)ctx->data;
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void *data_end = (void *)(long)ctx->data_end;
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__u32 key;
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__u64 *cnt;
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__u32 pkt_len = ctx->len;
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/* --- Ethernet --- */
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struct ethhdr_local *eth = data;
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if ((void *)(eth + 1) > data_end)
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return XDP_PASS;
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if (bpf_ntohs(eth->h_proto) != ETH_P_IP)
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return XDP_PASS;
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key = STAT_TOTAL;
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cnt = bpf_map_lookup_elem(&tc_stats, &key);
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if (cnt) (*cnt)++;
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/* --- IPv4 --- */
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struct iphdr *ip = data + ETH_HLEN;
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if ((void *)(ip + 1) > data_end)
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return XDP_PASS;
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if (ip->protocol != IPPROTO_TCP)
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return XDP_PASS;
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/* --- Ethernet : vérifier type IPv4 --- */
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if (pkt_len < ETH_HLEN + 20 + 20)
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return TC_ACT_OK;
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__u32 ihl = ip->ihl & 0x0F;
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if (ihl < 5)
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return XDP_PASS;
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__u32 ip_hlen = ihl << 2; /* ∈ [20, 60] */
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__be16 h_proto;
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bpf_skb_load_bytes(ctx, 12, &h_proto, 2);
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if (h_proto != bpf_htons(ETH_P_IP))
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return TC_ACT_OK;
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__u32 src_ip = ip->saddr;
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__u32 dst_ip = ip->daddr;
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__u8 ttl = ip->ttl;
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__u16 ip_id = bpf_ntohs(ip->id);
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__u16 frag_off = bpf_ntohs(ip->frag_off);
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/* --- IPv4 : lire le header (20 octets min) --- */
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key = STAT_IPV4;
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cnt = bpf_map_lookup_elem(&tc_stats, &key);
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if (cnt) (*cnt)++;
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struct iphdr iph;
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bpf_skb_load_bytes(ctx, ETH_HLEN, &iph, sizeof(iph));
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if (iph.protocol != IPPROTO_TCP)
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return TC_ACT_OK;
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__u32 ihl = iph.ihl & 0x0F;
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if (ihl < 5 || ihl > 15)
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return TC_ACT_OK;
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__u32 ip_hlen = ihl << 2;
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if (ip_hlen < 20 || ip_hlen > 60)
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return TC_ACT_OK;
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__u32 src_ip = iph.saddr;
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__u32 dst_ip = iph.daddr;
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__u8 ttl = iph.ttl;
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__u16 ip_id = bpf_ntohs(iph.id);
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__u16 frag_off = bpf_ntohs(iph.frag_off);
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__u8 df_bit = (frag_off & IP_DF) ? 1 : 0;
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/* --- TCP à offset variable --- */
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struct tcphdr *tcp = (void *)ip + ip_hlen;
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if ((void *)(tcp + 1) > data_end) /* valide tcp[0..19] */
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return XDP_PASS;
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/* --- TCP : lire le header (20 octets) --- */
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__u32 tcp_off = ETH_HLEN + ip_hlen;
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if (pkt_len < tcp_off + 20)
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return TC_ACT_OK;
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__u16 src_port = bpf_ntohs(tcp->source);
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__u16 dst_port = bpf_ntohs(tcp->dest);
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__u16 window = bpf_ntohs(tcp->window);
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key = STAT_TCP;
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cnt = bpf_map_lookup_elem(&tc_stats, &key);
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if (cnt) (*cnt)++;
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struct tcphdr tcph;
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bpf_skb_load_bytes(ctx, tcp_off, &tcph, sizeof(tcph));
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__u16 src_port = bpf_ntohs(tcph.source);
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__u16 dst_port = bpf_ntohs(tcph.dest);
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__u16 window = bpf_ntohs(tcph.window);
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/* Flags via les champs de bits du struct (sûr pour le vérificateur) */
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__u8 tcp_flags = 0;
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if (tcp->syn) tcp_flags |= TH_SYN;
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if (tcp->ack) tcp_flags |= TH_ACK;
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if (tcp->fin) tcp_flags |= TH_FIN;
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if (tcp->rst) tcp_flags |= TH_RST;
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if (tcph.syn) tcp_flags |= TH_SYN;
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if (tcph.ack) tcp_flags |= TH_ACK;
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if (tcph.fin) tcp_flags |= TH_FIN;
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if (tcph.rst) tcp_flags |= TH_RST;
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__u32 doff = tcp->doff;
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if (doff < 5)
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return XDP_PASS;
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__u32 tcp_hlen = doff << 2; /* ∈ [20, 60] */
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__u32 doff = tcph.doff;
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if (doff < 5 || doff > 15)
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return TC_ACT_OK;
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__u32 tcp_hlen = doff << 2;
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if (tcp_hlen < 20 || tcp_hlen > 60)
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return TC_ACT_OK;
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/* Offset du payload applicatif */
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void *payload = (void *)tcp + tcp_hlen;
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__u32 payload_off = ETH_HLEN + ip_hlen + tcp_hlen;
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/* ===================================================================
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* TCP SYN : extraction des paramètres L3/L4
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* TCP SYN
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* ===================================================================*/
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if ((tcp_flags & TH_SYN) && !(tcp_flags & TH_ACK)) {
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struct tcp_syn_event *evt =
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bpf_ringbuf_reserve(&rb_tcp_syn, sizeof(*evt), 0);
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if (!evt)
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return XDP_PASS;
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key = STAT_SYN;
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cnt = bpf_map_lookup_elem(&tc_stats, &key);
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if (cnt) (*cnt)++;
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evt->src_ip = bpf_ntohl(src_ip);
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evt->dst_ip = bpf_ntohl(dst_ip);
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evt->src_port = src_port;
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evt->dst_port = dst_port;
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evt->ttl = ttl;
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evt->df_bit = df_bit;
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evt->ip_id = ip_id;
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evt->window_size = window;
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evt->window_scale = 0xFF; /* défaut = absent */
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evt->mss = 0;
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evt->timestamp_ns = bpf_ktime_get_ns();
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evt->tcp_options_len = 0;
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struct tcp_syn_event evt = {};
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evt.src_ip = bpf_ntohl(src_ip);
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evt.dst_ip = bpf_ntohl(dst_ip);
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evt.src_port = src_port;
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evt.dst_port = dst_port;
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evt.ttl = ttl;
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evt.df_bit = df_bit;
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evt.ip_id = ip_id;
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evt.window_size = window;
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evt.window_scale = 0xFF;
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evt.mss = 0;
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evt.timestamp_ns = bpf_ktime_get_ns();
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evt.tcp_options_len = 0;
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/* Copie brute des options TCP (MSS/WS extraits en userspace Go).
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* Boucle bornée à MAX_TCP_OPTIONS = 40 itérations : triviale pour
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* le vérificateur kernel ≥ 5.3, sans #pragma unroll. */
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__u8 *opts_start = (__u8 *)(tcp + 1); /* après les 20 octets fixes */
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__u32 opts_len = tcp_hlen - 20; /* ∈ [0, 40] */
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if (opts_len > MAX_TCP_OPTIONS)
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opts_len = MAX_TCP_OPTIONS;
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if (opts_len > 0) {
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#pragma clang loop unroll(disable)
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for (__u32 i = 0; i < MAX_TCP_OPTIONS; i++) {
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if (i >= opts_len)
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break;
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if (opts_start + i + 1 > (__u8 *)data_end)
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break;
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evt->tcp_options_raw[i] = opts_start[i];
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}
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evt->tcp_options_len = (__u8)opts_len;
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/* Copie des options TCP via bpf_skb_load_bytes avec taille constante.
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* On lit MAX_TCP_OPTIONS=40 octets depuis le début des options.
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* Si le paquet est trop court, l'appel échoue → options absentes. */
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__u32 opts_off = tcp_off + 20;
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__u32 opts_len = tcp_hlen - 20;
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if (opts_len > 0 && opts_len <= MAX_TCP_OPTIONS &&
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opts_off + MAX_TCP_OPTIONS <= pkt_len) {
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bpf_skb_load_bytes(ctx, opts_off, evt.tcp_options_raw, MAX_TCP_OPTIONS);
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evt.tcp_options_len = (__u8)opts_len;
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}
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bpf_ringbuf_submit(evt, 0);
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bpf_perf_event_output(ctx, &pb_tcp_syn, BPF_F_CURRENT_CPU,
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&evt, sizeof(evt));
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key = STAT_SYN_SUBMIT;
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cnt = bpf_map_lookup_elem(&tc_stats, &key);
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if (cnt) (*cnt)++;
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}
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/* ===================================================================
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* TLS ClientHello (port 443)
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* ===================================================================*/
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if (dst_port == HTTPS_PORT) {
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/* Au moins 6 octets pour l'en-tête TLS record + type message */
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if (payload + 6 > data_end)
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return XDP_PASS;
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/* Lire les 6 premiers octets du payload pour vérifier le type TLS */
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if (payload_off + 6 > pkt_len)
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return TC_ACT_OK;
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__u8 tls_type = ((__u8 *)payload)[0];
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__u8 tls_msg_type = ((__u8 *)payload)[5];
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if (tls_type != TLS_CONTENT_HANDSHAKE || tls_msg_type != TLS_MSG_CLIENT_HELLO)
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return XDP_PASS;
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__u8 tls_hdr[6];
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bpf_skb_load_bytes(ctx, payload_off, tls_hdr, 6);
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__u32 avail = (__u8 *)data_end - (__u8 *)payload;
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/* avail ≥ 6 (vérifié ci-dessus), on plafonne à MAX_TLS_PAYLOAD */
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if (avail > MAX_TLS_PAYLOAD)
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avail = MAX_TLS_PAYLOAD;
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/* Barrière compilateur : coupe le lien CSE entre avail et (data_end - payload).
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* Sans cette barrière, clang génère un test "PTR_TO_PACKET <<= 32" (compare
|
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* data_end == payload pour l'entrée de boucle) que le vérificateur eBPF rejette.
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* La barrière force une comparaison scalaire (avail == 0) à la place. */
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asm volatile("" : "+r"(avail));
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if (tls_hdr[0] != TLS_CONTENT_HANDSHAKE || tls_hdr[5] != TLS_MSG_CLIENT_HELLO)
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return TC_ACT_OK;
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struct tls_hello_event *tls_evt =
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bpf_ringbuf_reserve(&rb_tls_hello, sizeof(*tls_evt), 0);
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/* Avail via pkt_len (scalaire pur) */
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__u32 avail = 0;
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if (pkt_len > payload_off) {
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avail = pkt_len - payload_off;
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if (avail > MAX_TLS_PAYLOAD)
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avail = MAX_TLS_PAYLOAD;
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}
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if (avail == 0)
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return TC_ACT_OK;
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__u32 zero = 0;
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struct tls_hello_event *tls_evt = bpf_map_lookup_elem(&__tls_buf, &zero);
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if (!tls_evt)
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return XDP_PASS;
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return TC_ACT_OK;
|
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tls_evt->src_ip = 0;
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tls_evt->src_port = 0;
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tls_evt->payload_len = 0;
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tls_evt->timestamp_ns = 0;
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tls_evt->src_ip = bpf_ntohl(src_ip);
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tls_evt->src_port = src_port;
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tls_evt->timestamp_ns = bpf_ktime_get_ns();
|
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tls_evt->payload_len = (__u16)avail;
|
||||
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/* Copie bornée du payload TLS.
|
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* Pour tout i < avail : payload + i < payload + avail ≤ data_end.
|
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* Le vérificateur kernel ≥ 5.3 peut vérifier cette boucle sans unroll. */
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__u8 *src = (__u8 *)payload;
|
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#pragma clang loop unroll(disable)
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for (__u32 i = 0; i < MAX_TLS_PAYLOAD; i++) {
|
||||
if (i >= avail)
|
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break;
|
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if (src + i + 1 > (__u8 *)data_end)
|
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break;
|
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tls_evt->payload[i] = src[i];
|
||||
}
|
||||
/* Copie via bpf_skb_load_bytes avec taille constante 256.
|
||||
* Kernel 4.18 ne supporte pas les tailles variables vers map values.
|
||||
* 256 octets capture le ClientHello dans la majorité des cas. */
|
||||
if (bpf_skb_load_bytes(ctx, payload_off, tls_evt, 256))
|
||||
return TC_ACT_OK;
|
||||
|
||||
bpf_ringbuf_submit(tls_evt, 0);
|
||||
return XDP_PASS;
|
||||
bpf_perf_event_output(ctx, &pb_tls_hello, BPF_F_CURRENT_CPU,
|
||||
tls_evt, sizeof(*tls_evt));
|
||||
|
||||
key = STAT_TLS_SUBMIT;
|
||||
cnt = bpf_map_lookup_elem(&tc_stats, &key);
|
||||
if (cnt) (*cnt)++;
|
||||
|
||||
return TC_ACT_OK;
|
||||
}
|
||||
|
||||
/* ===================================================================
|
||||
* HTTP en clair (port 80 / 8080)
|
||||
* ===================================================================*/
|
||||
if (dst_port == HTTP_PORT || dst_port == HTTP_ALT_PORT) {
|
||||
/* Ignorer SYN, FIN, RST : seuls les segments de données */
|
||||
if (tcp_flags & (TH_SYN | TH_FIN | TH_RST))
|
||||
return XDP_PASS;
|
||||
if (payload >= data_end)
|
||||
return XDP_PASS;
|
||||
return TC_ACT_OK;
|
||||
if (payload_off >= pkt_len)
|
||||
return TC_ACT_OK;
|
||||
|
||||
__u32 avail = (__u8 *)data_end - (__u8 *)payload;
|
||||
if (avail > MAX_HTTP_PAYLOAD)
|
||||
avail = MAX_HTTP_PAYLOAD;
|
||||
/* Même barrière que pour la section TLS : force comparaison scalaire. */
|
||||
asm volatile("" : "+r"(avail));
|
||||
/* Avail via pkt_len (scalaire pur) */
|
||||
__u32 avail = 0;
|
||||
if (pkt_len > payload_off) {
|
||||
avail = pkt_len - payload_off;
|
||||
if (avail > MAX_HTTP_PAYLOAD)
|
||||
avail = MAX_HTTP_PAYLOAD;
|
||||
}
|
||||
if (avail == 0)
|
||||
return TC_ACT_OK;
|
||||
|
||||
struct http_plain_event *h_evt =
|
||||
bpf_ringbuf_reserve(&rb_http_plain, sizeof(*h_evt), 0);
|
||||
__u32 zero = 0;
|
||||
struct http_plain_event *h_evt = bpf_map_lookup_elem(&__http_buf, &zero);
|
||||
if (!h_evt)
|
||||
return XDP_PASS;
|
||||
return TC_ACT_OK;
|
||||
|
||||
h_evt->src_ip = 0;
|
||||
h_evt->dst_ip = 0;
|
||||
h_evt->src_port = 0;
|
||||
h_evt->dst_port = 0;
|
||||
h_evt->payload_len = 0;
|
||||
h_evt->timestamp_ns = 0;
|
||||
|
||||
h_evt->src_ip = bpf_ntohl(src_ip);
|
||||
h_evt->dst_ip = bpf_ntohl(dst_ip);
|
||||
@ -240,21 +271,19 @@ int capture_xdp(struct xdp_md *ctx)
|
||||
h_evt->timestamp_ns = bpf_ktime_get_ns();
|
||||
h_evt->payload_len = (__u16)avail;
|
||||
|
||||
__u8 *src = (__u8 *)payload;
|
||||
#pragma clang loop unroll(disable)
|
||||
for (__u32 i = 0; i < MAX_HTTP_PAYLOAD; i++) {
|
||||
if (i >= avail)
|
||||
break;
|
||||
if (src + i + 1 > (__u8 *)data_end)
|
||||
break;
|
||||
h_evt->payload[i] = src[i];
|
||||
}
|
||||
/* Taille constante 256 pour compatibilité vérificateur kernel 4.18 */
|
||||
if (bpf_skb_load_bytes(ctx, payload_off, h_evt, 256))
|
||||
return TC_ACT_OK;
|
||||
|
||||
bpf_ringbuf_submit(h_evt, 0);
|
||||
bpf_perf_event_output(ctx, &pb_http_plain, BPF_F_CURRENT_CPU,
|
||||
h_evt, sizeof(*h_evt));
|
||||
|
||||
key = STAT_HTTP_SUBMIT;
|
||||
cnt = bpf_map_lookup_elem(&tc_stats, &key);
|
||||
if (cnt) (*cnt)++;
|
||||
}
|
||||
|
||||
return XDP_PASS;
|
||||
return TC_ACT_OK;
|
||||
}
|
||||
|
||||
char LICENSE[] SEC("license") = "GPL";
|
||||
|
||||
|
||||
Reference in New Issue
Block a user